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Add support for DPMI32. Make winedos16.dll unnecessary.
[wine/multimedia.git] / dlls / winedos / int31.c
blobbebb7f3aad1d31524cb6683d607e7a57e3c2fb07
1 /*
2 * DPMI 0.9 emulation
3 *
4 * Copyright 1995 Alexandre Julliard
5 *
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.
10 *
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.
15 *
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include "windef.h"
25 #include "wine/winbase16.h"
26 #include "miscemu.h"
27 #include "task.h"
28 #include "msdos.h"
29 #include "dosexe.h"
30
31 #include "wine/debug.h"
32 #include "stackframe.h"
33 #include "toolhelp.h"
34
35 WINE_DEFAULT_DEBUG_CHANNEL(int31);
36
37 /* Structure for real-mode callbacks */
38 typedef struct
39 {
40 DWORD edi;
41 DWORD esi;
42 DWORD ebp;
43 DWORD reserved;
44 DWORD ebx;
45 DWORD edx;
46 DWORD ecx;
47 DWORD eax;
48 WORD fl;
49 WORD es;
50 WORD ds;
51 WORD fs;
52 WORD gs;
53 WORD ip;
54 WORD cs;
55 WORD sp;
56 WORD ss;
57 } REALMODECALL;
58
59 typedef struct tagRMCB {
60 DWORD address;
61 DWORD proc_ofs,proc_sel;
62 DWORD regs_ofs,regs_sel;
63 struct tagRMCB *next;
64 } RMCB;
65
66 static RMCB *FirstRMCB = NULL;
67 static WORD dpmi_flag;
68 static void* lastvalloced = NULL;
69
70 /**********************************************************************
71 * DOSVM_IsDos32
72 *
73 * Return TRUE if we are in 32-bit protected mode DOS process.
74 */
75 BOOL DOSVM_IsDos32(void)
76 {
77 return (dpmi_flag & 1) ? TRUE : FALSE;
78 }
79
80
81 /**********************************************************************
82 * INT_GetRealModeContext
83 */
84 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
85 {
86 context->Eax = call->eax;
87 context->Ebx = call->ebx;
88 context->Ecx = call->ecx;
89 context->Edx = call->edx;
90 context->Esi = call->esi;
91 context->Edi = call->edi;
92 context->Ebp = call->ebp;
93 context->EFlags = call->fl | V86_FLAG;
94 context->Eip = call->ip;
95 context->Esp = call->sp;
96 context->SegCs = call->cs;
97 context->SegDs = call->ds;
98 context->SegEs = call->es;
99 context->SegFs = call->fs;
100 context->SegGs = call->gs;
101 context->SegSs = call->ss;
102 }
103
104
105 /**********************************************************************
106 * INT_SetRealModeContext
107 */
108 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
109 {
110 call->eax = context->Eax;
111 call->ebx = context->Ebx;
112 call->ecx = context->Ecx;
113 call->edx = context->Edx;
114 call->esi = context->Esi;
115 call->edi = context->Edi;
116 call->ebp = context->Ebp;
117 call->fl = LOWORD(context->EFlags);
118 call->ip = LOWORD(context->Eip);
119 call->sp = LOWORD(context->Esp);
120 call->cs = context->SegCs;
121 call->ds = context->SegDs;
122 call->es = context->SegEs;
123 call->fs = context->SegFs;
124 call->gs = context->SegGs;
125 call->ss = context->SegSs;
126 }
127
128 /**********************************************************************
129 * DPMI_xalloc
130 * special virtualalloc, allocates lineary monoton growing memory.
131 * (the usual VirtualAlloc does not satisfy that restriction)
132 */
133 static LPVOID DPMI_xalloc( DWORD len )
134 {
135 LPVOID ret;
136 LPVOID oldlastv = lastvalloced;
137
138 if (lastvalloced)
139 {
140 int xflag = 0;
141
142 ret = NULL;
143 while (!ret)
144 {
145 ret = VirtualAlloc( lastvalloced, len,
146 MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE );
147 if (!ret)
148 lastvalloced = (char *) lastvalloced + 0x10000;
149
150 /* we failed to allocate one in the first round.
151 * try non-linear
152 */
153 if (!xflag && (lastvalloced<oldlastv))
154 {
155 /* wrapped */
156 FIXME( "failed to allocate linearly growing memory (%ld bytes), "
157 "using non-linear growing...\n", len );
158 xflag++;
159 }
160
161 /* if we even fail to allocate something in the next
162 * round, return NULL
163 */
164 if ((xflag==1) && (lastvalloced >= oldlastv))
165 xflag++;
166
167 if ((xflag==2) && (lastvalloced < oldlastv)) {
168 FIXME( "failed to allocate any memory of %ld bytes!\n", len );
169 return NULL;
170 }
171 }
172 }
173 else
174 {
175 ret = VirtualAlloc( NULL, len,
176 MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE );
177 }
178
179 lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
180 return ret;
181 }
182
183 /**********************************************************************
184 * DPMI_xfree
185 */
186 static void DPMI_xfree( LPVOID ptr )
187 {
188 VirtualFree( ptr, 0, MEM_RELEASE );
189 }
190
191 /**********************************************************************
192 * DPMI_xrealloc
193 *
194 * FIXME: perhaps we could grow this mapped area...
195 */
196 static LPVOID DPMI_xrealloc( LPVOID ptr, DWORD newsize )
197 {
198 MEMORY_BASIC_INFORMATION mbi;
199 LPVOID newptr;
200
201 newptr = DPMI_xalloc( newsize );
202 if (ptr)
203 {
204 if (!VirtualQuery(ptr,&mbi,sizeof(mbi)))
205 {
206 FIXME( "realloc of DPMI_xallocd region %p?\n", ptr );
207 return NULL;
208 }
209
210 if (mbi.State == MEM_FREE)
211 {
212 FIXME( "realloc of DPMI_xallocd region %p?\n", ptr );
213 return NULL;
214 }
215
216 /* We do not shrink allocated memory. most reallocs
217 * only do grows anyway
218 */
219 if (newsize <= mbi.RegionSize)
220 return ptr;
221
222 memcpy( newptr, ptr, mbi.RegionSize );
223 DPMI_xfree( ptr );
224 }
225
226 return newptr;
227 }
228
229
230 #ifdef __i386__
231
232 void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
233 #if 0 /* original code, which early gccs puke on */
234 {
235 int _clobber;
236 __asm__ __volatile__(
237 "pushl %%ebp\n"
238 "pushl %%ebx\n"
239 "pushl %%es\n"
240 "pushl %%ds\n"
241 "pushfl\n"
242 "mov %7,%%es\n"
243 "mov %5,%%ds\n"
244 ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
245 "popl %%ds\n"
246 "mov %%es,%0\n"
247 "popl %%es\n"
248 "popl %%ebx\n"
249 "popl %%ebp\n"
250 : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
251 : "0" (ss), "2" (esp),
252 "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
253 "3" (&rmcb->proc_ofs) );
254 }
255 #else /* code generated by a gcc new enough */
256 ;
257 __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
258 "pushl %ebp\n\t"
259 "movl %esp,%ebp\n\t"
260 "pushl %edi\n\t"
261 "pushl %esi\n\t"
262 "movl 0x8(%ebp),%eax\n\t"
263 "movl 0x10(%ebp),%esi\n\t"
264 "movl 0xc(%ebp),%edx\n\t"
265 "movl 0x10(%eax),%ecx\n\t"
266 "movl 0xc(%eax),%edi\n\t"
267 "addl $0x4,%eax\n\t"
268 "pushl %ebp\n\t"
269 "pushl %ebx\n\t"
270 "pushl %es\n\t"
271 "pushl %ds\n\t"
272 "pushfl\n\t"
273 "mov %cx,%es\n\t"
274 "mov %dx,%ds\n\t"
275 ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
276 "popl %ds\n\t"
277 "mov %es,%dx\n\t"
278 "popl %es\n\t"
279 "popl %ebx\n\t"
280 "popl %ebp\n\t"
281 "movl 0x14(%ebp),%eax\n\t"
282 "movw %dx,(%eax)\n\t"
283 "movl 0x18(%ebp),%edx\n\t"
284 "movl %edi,(%edx)\n\t"
285 "popl %esi\n\t"
286 "popl %edi\n\t"
287 "leave\n\t"
288 "ret")
289 #endif
290
291 #endif /* __i386__ */
292
293 /**********************************************************************
294 * DPMI_CallRMCBProc
295 *
296 * This routine does the hard work of calling a callback procedure.
297 */
298 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
299 {
300 if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
301 /* Wine-internal RMCB, call directly */
302 ((RMCBPROC)rmcb->proc_ofs)(context);
303 } else {
304 #ifdef __i386__
305 UINT16 ss,es;
306 DWORD esp,edi;
307
308 INT_SetRealModeContext(MapSL(MAKESEGPTR( rmcb->regs_sel, rmcb->regs_ofs )), context);
309 ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA );
310 esp = context->Esp;
311
312 FIXME("untested!\n");
313
314 /* The called proc ends with an IRET, and takes these parameters:
315 * DS:ESI = pointer to real-mode SS:SP
316 * ES:EDI = pointer to real-mode call structure
317 * It returns:
318 * ES:EDI = pointer to real-mode call structure (may be a copy)
319 * It is the proc's responsibility to change the return CS:IP in the
320 * real-mode call structure. */
321 if (flag & 1) {
322 /* 32-bit DPMI client */
323 DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
324 } else {
325 /* 16-bit DPMI client */
326 CONTEXT86 ctx = *context;
327 ctx.SegCs = rmcb->proc_sel;
328 ctx.Eip = rmcb->proc_ofs;
329 ctx.SegDs = ss;
330 ctx.Esi = esp;
331 ctx.SegEs = rmcb->regs_sel;
332 ctx.Edi = rmcb->regs_ofs;
333 /* FIXME: I'm pretty sure this isn't right - should push flags first */
334 wine_call_to_16_regs_short(&ctx, 0);
335 es = ctx.SegEs;
336 edi = ctx.Edi;
337 }
338 FreeSelector16(ss);
339 INT_GetRealModeContext( MapSL( MAKESEGPTR( es, edi )), context);
340 #else
341 ERR("RMCBs only implemented for i386\n");
342 #endif
343 }
344 }
345
346
347 /**********************************************************************
348 * DPMI_CallRMProc
349 *
350 * This routine does the hard work of calling a real mode procedure.
351 */
352 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
353 {
354 LPWORD stack16;
355 LPVOID addr = NULL; /* avoid gcc warning */
356 RMCB *CurrRMCB;
357 int alloc = 0, already = 0;
358 BYTE *code;
359
360 TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
361 context->Eax, context->Ebx, context->Ecx, context->Edx );
362 TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
363 context->Esi, context->Edi, context->SegEs, context->SegDs,
364 context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
365
366 callrmproc_again:
367
368 /* there might be some code that just jumps to RMCBs or the like,
369 in which case following the jumps here might get us to a shortcut */
370 code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
371 switch (*code) {
372 case 0xe9: /* JMP NEAR */
373 context->Eip += 3 + *(WORD *)(code+1);
374 /* yeah, I know these gotos don't look good... */
375 goto callrmproc_again;
376 case 0xea: /* JMP FAR */
377 context->Eip = *(WORD *)(code+1);
378 context->SegCs = *(WORD *)(code+3);
379 /* ...but since the label is there anyway... */
380 goto callrmproc_again;
381 case 0xeb: /* JMP SHORT */
382 context->Eip += 2 + *(signed char *)(code+1);
383 /* ...because of other gotos below, so... */
384 goto callrmproc_again;
385 }
386
387 /* shortcut for chaining to internal interrupt handlers */
388 if ((context->SegCs == 0xF000) && iret)
389 {
390 DOSVM_RealModeInterrupt( LOWORD(context->Eip)/4, context);
391 return 0;
392 }
393
394 /* shortcut for RMCBs */
395 CurrRMCB = FirstRMCB;
396
397 while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
398 CurrRMCB = CurrRMCB->next;
399
400 if (!CurrRMCB && !MZ_Current())
401 {
402 FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
403 TRACE("creating VM86 task\n");
404 MZ_AllocDPMITask();
405 }
406 if (!already) {
407 if (!context->SegSs) {
408 alloc = 1; /* allocate default stack */
409 stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
410 context->Esp = 64-2;
411 stack16 += 32-1;
412 if (!addr) {
413 ERR("could not allocate default stack\n");
414 return 1;
415 }
416 } else {
417 stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
418 }
419 context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
420 stack16 -= args;
421 if (args) memcpy(stack16, stack, args*sizeof(WORD) );
422 /* push flags if iret */
423 if (iret) {
424 stack16--; args++;
425 *stack16 = LOWORD(context->EFlags);
426 }
427 /* push return address (return to interrupt wrapper) */
428 *(--stack16) = DOSVM_dpmi_segments->wrap_seg;
429 *(--stack16) = 0;
430 /* adjust stack */
431 context->Esp -= 2*sizeof(WORD);
432 already = 1;
433 }
434
435 if (CurrRMCB) {
436 /* RMCB call, invoke protected-mode handler directly */
437 DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
438 /* check if we returned to where we thought we would */
439 if ((context->SegCs != DOSVM_dpmi_segments->wrap_seg) ||
440 (LOWORD(context->Eip) != 0)) {
441 /* we need to continue at different address in real-mode space,
442 so we need to set it all up for real mode again */
443 goto callrmproc_again;
444 }
445 } else {
446 TRACE("entering real mode...\n");
447 DOSVM_Enter( context );
448 TRACE("returned from real-mode call\n");
449 }
450 if (alloc) DOSMEM_FreeBlock( addr );
451 return 0;
452 }
453
454
455 /**********************************************************************
456 * CallRMInt (WINEDOS.@)
457 */
458 void WINAPI DOSVM_CallRMInt( CONTEXT86 *context )
459 {
460 CONTEXT86 realmode_ctx;
461 FARPROC16 rm_int = DOSVM_GetRMHandler( BL_reg(context) );
462 REALMODECALL *call = CTX_SEG_OFF_TO_LIN( context,
463 context->SegEs,
464 context->Edi );
465 INT_GetRealModeContext( call, &realmode_ctx );
466
467 /* we need to check if a real-mode program has hooked the interrupt */
468 if (HIWORD(rm_int)!=0xF000) {
469 /* yup, which means we need to switch to real mode... */
470 realmode_ctx.SegCs = HIWORD(rm_int);
471 realmode_ctx.Eip = LOWORD(rm_int);
472 if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
473 SET_CFLAG(context);
474 } else {
475 RESET_CFLAG(context);
476 /* use the IP we have instead of BL_reg, in case some apps
477 decide to move interrupts around for whatever reason... */
478 DOSVM_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx );
479 }
480 INT_SetRealModeContext( call, &realmode_ctx );
481 }
482
483
484 /**********************************************************************
485 * CallRMProc (WINEDOS.@)
486 */
487 void WINAPI DOSVM_CallRMProc( CONTEXT86 *context, int iret )
488 {
489 REALMODECALL *p = CTX_SEG_OFF_TO_LIN( context,
490 context->SegEs,
491 context->Edi );
492 CONTEXT86 context16;
493
494 TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
495 p->eax, p->ebx, p->ecx, p->edx);
496 TRACE(" ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
497 p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
498
499 if (!(p->cs) && !(p->ip)) { /* remove this check
500 if Int21/6501 case map function
501 has been implemented */
502 SET_CFLAG(context);
503 return;
504 }
505 INT_GetRealModeContext(p, &context16);
506 DPMI_CallRMProc( &context16, ((LPWORD)MapSL(MAKESEGPTR(context->SegSs, LOWORD(context->Esp))))+3,
507 CX_reg(context), iret );
508 INT_SetRealModeContext(p, &context16);
509 }
510
511
512 /* (see dosmem.c, function DOSMEM_InitDPMI) */
513 static void StartPM( CONTEXT86 *context )
514 {
515 UINT16 cs, ss, ds, es;
516 CONTEXT86 pm_ctx;
517 DWORD psp_ofs = (DWORD)(DOSVM_psp<<4);
518 PDB16 *psp = (PDB16 *)psp_ofs;
519 HANDLE16 env_seg = psp->environment;
520 unsigned char selflags = WINE_LDT_FLAGS_DATA;
521
522 RESET_CFLAG(context);
523 dpmi_flag = AX_reg(context);
524 /* our mode switch wrapper have placed the desired CS into DX */
525 cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE );
526 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
527 can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
528 ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
529 32-bit code using this stack. */
530 if (dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
531 ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags );
532 /* do the same for the data segments, just in case */
533 if (context->SegDs == context->SegSs) ds = ss;
534 else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags );
535 es = SELECTOR_AllocBlock( psp, 0x100, selflags );
536 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
537 psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA );
538
539 pm_ctx = *context;
540 pm_ctx.SegCs = DOSVM_dpmi_segments->dpmi_sel;
541 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
542 pm_ctx.Eax = ss;
543 pm_ctx.Edx = cs;
544 pm_ctx.SegDs = ds;
545 pm_ctx.SegEs = es;
546 pm_ctx.SegFs = 0;
547 pm_ctx.SegGs = 0;
548
549 TRACE("DOS program is now entering %d-bit protected mode\n",
550 DOSVM_IsDos32() ? 32 : 16);
551 wine_call_to_16_regs_short(&pm_ctx, 0);
552
553 /* in the current state of affairs, we won't ever actually return here... */
554 /* we should have int21/ah=4c do it someday, though... */
555
556 FreeSelector16(psp->environment);
557 psp->environment = env_seg;
558 FreeSelector16(es);
559 if (ds != ss) FreeSelector16(ds);
560 FreeSelector16(ss);
561 FreeSelector16(cs);
562 }
563
564 static RMCB *DPMI_AllocRMCB( void )
565 {
566 RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
567 UINT16 uParagraph;
568
569 if (NewRMCB)
570 {
571 LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
572 LPBYTE p = RMCBmem;
573
574 *p++ = 0xcd; /* RMCB: */
575 *p++ = 0x31; /* int $0x31 */
576 /* it is the called procedure's task to change the return CS:EIP
577 the DPMI 0.9 spec states that if it doesn't, it will be called again */
578 *p++ = 0xeb;
579 *p++ = 0xfc; /* jmp RMCB */
580 NewRMCB->address = MAKELONG(0, uParagraph);
581 NewRMCB->next = FirstRMCB;
582 FirstRMCB = NewRMCB;
583 }
584 return NewRMCB;
585 }
586
587
588 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
589 {
590 RMCB *NewRMCB = DPMI_AllocRMCB();
591
592 if (NewRMCB) {
593 NewRMCB->proc_ofs = (DWORD)proc;
594 NewRMCB->proc_sel = 0;
595 NewRMCB->regs_ofs = 0;
596 NewRMCB->regs_sel = 0;
597 return (FARPROC16)(NewRMCB->address);
598 }
599 return NULL;
600 }
601
602
603 static int DPMI_FreeRMCB( DWORD address )
604 {
605 RMCB *CurrRMCB = FirstRMCB;
606 RMCB *PrevRMCB = NULL;
607
608 while (CurrRMCB && (CurrRMCB->address != address))
609 {
610 PrevRMCB = CurrRMCB;
611 CurrRMCB = CurrRMCB->next;
612 }
613 if (CurrRMCB)
614 {
615 if (PrevRMCB)
616 PrevRMCB->next = CurrRMCB->next;
617 else
618 FirstRMCB = CurrRMCB->next;
619 DOSMEM_FreeBlock(PTR_REAL_TO_LIN(SELECTOROF(CurrRMCB->address),OFFSETOF(CurrRMCB->address)));
620 HeapFree(GetProcessHeap(), 0, CurrRMCB);
621 return 0;
622 }
623 return 1;
624 }
625
626
627 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
628 {
629 DPMI_FreeRMCB( (DWORD)proc );
630 }
631
632
633 /**********************************************************************
634 * RawModeSwitch (WINEDOS.@)
635 *
636 * DPMI Raw Mode Switch handler
637 */
638 void WINAPI DOSVM_RawModeSwitch( CONTEXT86 *context )
639 {
640 CONTEXT86 rm_ctx;
641 int ret;
642
643 /* initialize real-mode context as per spec */
644 memset(&rm_ctx, 0, sizeof(rm_ctx));
645 rm_ctx.SegDs = AX_reg(context);
646 rm_ctx.SegEs = CX_reg(context);
647 rm_ctx.SegSs = DX_reg(context);
648 rm_ctx.Esp = context->Ebx;
649 rm_ctx.SegCs = SI_reg(context);
650 rm_ctx.Eip = context->Edi;
651 rm_ctx.Ebp = context->Ebp;
652 rm_ctx.SegFs = 0;
653 rm_ctx.SegGs = 0;
654 rm_ctx.EFlags = context->EFlags; /* at least we need the IF flag */
655
656 /* enter real mode again */
657 TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
658 ret = DOSVM_Enter( &rm_ctx );
659 /* when the real-mode stuff call its mode switch address,
660 DOSVM_Enter will return and we will continue here */
661
662 if (ret<0) {
663 ERR("Sync lost!\n");
664 /* if the sync was lost, there's no way to recover */
665 ExitProcess(1);
666 }
667
668 /* alter protected-mode context as per spec */
669 context->SegDs = LOWORD(rm_ctx.Eax);
670 context->SegEs = LOWORD(rm_ctx.Ecx);
671 context->SegSs = LOWORD(rm_ctx.Edx);
672 context->Esp = rm_ctx.Ebx;
673 context->SegCs = LOWORD(rm_ctx.Esi);
674 context->Eip = rm_ctx.Edi;
675 context->Ebp = rm_ctx.Ebp;
676 context->SegFs = 0;
677 context->SegGs = 0;
678
679 /* Return to new address and hope that we didn't mess up */
680 TRACE("re-entering protected mode at %04lx:%08lx\n",
681 context->SegCs, context->Eip);
682 }
683
684
685 /**********************************************************************
686 * AllocRMCB (WINEDOS.@)
687 */
688 void WINAPI DOSVM_AllocRMCB( CONTEXT86 *context )
689 {
690 RMCB *NewRMCB = DPMI_AllocRMCB();
691
692 TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
693
694 if (NewRMCB)
695 {
696 NewRMCB->proc_ofs = DOSVM_IsDos32() ? context->Esi : LOWORD(context->Esi);
697 NewRMCB->proc_sel = context->SegDs;
698 NewRMCB->regs_ofs = DOSVM_IsDos32() ? context->Edi : LOWORD(context->Edi);
699 NewRMCB->regs_sel = context->SegEs;
700 SET_CX( context, HIWORD(NewRMCB->address) );
701 SET_DX( context, LOWORD(NewRMCB->address) );
702 }
703 else
704 {
705 SET_AX( context, 0x8015 ); /* callback unavailable */
706 SET_CFLAG(context);
707 }
708 }
709
710
711 /**********************************************************************
712 * FreeRMCB (WINEDOS.@)
713 */
714 void WINAPI DOSVM_FreeRMCB( CONTEXT86 *context )
715 {
716 FIXME("callback address: %04x:%04x\n",
717 CX_reg(context), DX_reg(context));
718
719 if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
720 SET_AX( context, 0x8024 ); /* invalid callback address */
721 SET_CFLAG(context);
722 }
723 }
724
725
726 /**********************************************************************
727 * DOSVM_RawModeSwitchHandler
728 *
729 * DPMI Raw Mode Switch handler.
730 * This routine does all the stack manipulation tricks needed
731 * to return from protected mode interrupt using modified
732 * code and stack pointers.
733 */
734 void WINAPI DOSVM_RawModeSwitchHandler( CONTEXT86 *context )
735 {
736 STACK16FRAME frame;
737 DOSVM_SaveCallFrame( context, &frame );
738 DOSVM_RawModeSwitch( context );
739 DOSVM_RestoreCallFrame( context, &frame );
740 }
741
742
743 /**********************************************************************
744 * DOSVM_CheckWrappers
745 *
746 * Check if this was really a wrapper call instead of an interrupt.
747 * FIXME: Protected mode stuff does not work in 32-bit DPMI.
748 * FIXME: If int31 is called asynchronously (unlikely)
749 * wrapper checks are wrong (CS/IP must not be used).
750 */
751 static BOOL DOSVM_CheckWrappers( CONTEXT86 *context )
752 {
753 /* check if it's our wrapper */
754 TRACE("called from real mode\n");
755 if (context->SegCs==DOSVM_dpmi_segments->dpmi_seg) {
756 /* This is the protected mode switch */
757 StartPM(context);
758 return TRUE;
759 }
760 else if (context->SegCs==DOSVM_dpmi_segments->xms_seg)
761 {
762 /* This is the XMS driver entry point */
763 XMS_Handler(context);
764 return TRUE;
765 }
766 else
767 {
768 /* Check for RMCB */
769 RMCB *CurrRMCB = FirstRMCB;
770
771 while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
772 CurrRMCB = CurrRMCB->next;
773
774 if (CurrRMCB) {
775 /* RMCB call, propagate to protected-mode handler */
776 DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
777 return TRUE;
778 }
779 }
780
781 return FALSE;
782 }
783
784 /**********************************************************************
785 * DOSVM_Int31Handler (WINEDOS16.149)
786 *
787 * Handler for int 31h (DPMI).
788 */
789 void WINAPI DOSVM_Int31Handler( CONTEXT86 *context )
790 {
791 if (ISV86(context) && DOSVM_CheckWrappers(context))
792 return;
793
794 RESET_CFLAG(context);
795 switch(AX_reg(context))
796 {
797 case 0x0000: /* Allocate LDT descriptors */
798 TRACE( "allocate LDT descriptors (%d)\n", CX_reg(context) );
799 {
800 WORD sel = AllocSelectorArray16( CX_reg(context) );
801 if(!sel)
802 {
803 TRACE( "failed\n" );
804 SET_AX( context, 0x8011 ); /* descriptor unavailable */
805 SET_CFLAG( context );
806 }
807 else
808 {
809 TRACE( "success, array starts at 0x%04x\n", sel );
810 SET_AX( context, sel );
811 }
812 }
813 break;
814
815 case 0x0001: /* Free LDT descriptor */
816 TRACE( "free LDT descriptor (0x%04x)\n", BX_reg(context) );
817 if (FreeSelector16( BX_reg(context) ))
818 {
819 SET_AX( context, 0x8022 ); /* invalid selector */
820 SET_CFLAG( context );
821 }
822 else
823 {
824 /* If a segment register contains the selector being freed, */
825 /* set it to zero. */
826 if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
827 if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
828 if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
829 if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
830 }
831 break;
832
833 case 0x0002: /* Real mode segment to descriptor */
834 TRACE( "real mode segment to descriptor (0x%04x)\n", BX_reg(context) );
835 {
836 WORD entryPoint = 0; /* KERNEL entry point for descriptor */
837 switch(BX_reg(context))
838 {
839 case 0x0000: entryPoint = 183; break; /* __0000H */
840 case 0x0040: entryPoint = 193; break; /* __0040H */
841 case 0xa000: entryPoint = 174; break; /* __A000H */
842 case 0xb000: entryPoint = 181; break; /* __B000H */
843 case 0xb800: entryPoint = 182; break; /* __B800H */
844 case 0xc000: entryPoint = 195; break; /* __C000H */
845 case 0xd000: entryPoint = 179; break; /* __D000H */
846 case 0xe000: entryPoint = 190; break; /* __E000H */
847 case 0xf000: entryPoint = 194; break; /* __F000H */
848 default:
849 SET_AX( context, DOSMEM_AllocSelector(BX_reg(context)) );
850 break;
851 }
852 if (entryPoint)
853 {
854 FARPROC16 proc = GetProcAddress16( GetModuleHandle16( "KERNEL" ),
855 (LPCSTR)(ULONG_PTR)entryPoint );
856 SET_AX( context, LOWORD(proc) );
857 }
858 }
859 break;
860
861 case 0x0003: /* Get next selector increment */
862 TRACE("get selector increment (__AHINCR)\n");
863 context->Eax = __AHINCR;
864 break;
865
866 case 0x0004: /* Lock selector (not supported) */
867 FIXME("lock selector not supported\n");
868 context->Eax = 0; /* FIXME: is this a correct return value? */
869 break;
870
871 case 0x0005: /* Unlock selector (not supported) */
872 FIXME("unlock selector not supported\n");
873 context->Eax = 0; /* FIXME: is this a correct return value? */
874 break;
875
876 case 0x0006: /* Get selector base address */
877 TRACE( "get selector base address (0x%04x)\n", BX_reg(context) );
878 {
879 WORD sel = BX_reg(context);
880 if (IS_SELECTOR_SYSTEM(sel) || IS_SELECTOR_FREE(sel))
881 {
882 context->Eax = 0x8022; /* invalid selector */
883 SET_CFLAG(context);
884 }
885 else
886 {
887 DWORD base = GetSelectorBase( sel );
888 SET_CX( context, HIWORD(base) );
889 SET_DX( context, LOWORD(base) );
890 }
891 }
892 break;
893
894 case 0x0007: /* Set selector base address */
895 {
896 DWORD base = MAKELONG( DX_reg(context), CX_reg(context) );
897 WORD sel = BX_reg(context);
898 TRACE( "set selector base address (0x%04x,0x%08lx)\n", sel, base );
899
900 /* check if Win16 app wants to access lower 64K of DOS memory */
901 if (base < 0x10000 && DOSVM_IsWin16())
902 DOSMEM_Init(TRUE);
903
904 SetSelectorBase( sel, base );
905 }
906 break;
907
908 case 0x0008: /* Set selector limit */
909 {
910 DWORD limit = MAKELONG( DX_reg(context), CX_reg(context) );
911 TRACE( "set selector limit (0x%04x,0x%08lx)\n",
912 BX_reg(context), limit );
913 SetSelectorLimit16( BX_reg(context), limit );
914 }
915 break;
916
917 case 0x0009: /* Set selector access rights */
918 TRACE( "set selector access rights(0x%04x,0x%04x)\n",
919 BX_reg(context), CX_reg(context) );
920 SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
921 break;
922
923 case 0x000a: /* Allocate selector alias */
924 TRACE( "allocate selector alias (0x%04x)\n", BX_reg(context) );
925 if (!SET_AX( context, AllocCStoDSAlias16( BX_reg(context) )))
926 {
927 SET_AX( context, 0x8011 ); /* descriptor unavailable */
928 SET_CFLAG(context);
929 }
930 break;
931
932 case 0x000b: /* Get descriptor */
933 TRACE( "get descriptor (0x%04x)\n", BX_reg(context) );
934 {
935 LDT_ENTRY *entry = (LDT_ENTRY*)CTX_SEG_OFF_TO_LIN( context,
936 context->SegEs,
937 context->Edi );
938 wine_ldt_get_entry( BX_reg(context), entry );
939 }
940 break;
941
942 case 0x000c: /* Set descriptor */
943 TRACE( "set descriptor (0x%04x)\n", BX_reg(context) );
944 {
945 LDT_ENTRY *entry = (LDT_ENTRY*)CTX_SEG_OFF_TO_LIN( context,
946 context->SegEs,
947 context->Edi );
948 wine_ldt_set_entry( BX_reg(context), entry );
949 }
950 break;
951
952 case 0x000d: /* Allocate specific LDT descriptor */
953 FIXME( "allocate descriptor (0x%04x), stub!\n", BX_reg(context) );
954 SET_AX( context, 0x8011 ); /* descriptor unavailable */
955 SET_CFLAG( context );
956 break;
957
958 case 0x000e: /* Get Multiple Descriptors (1.0) */
959 FIXME( "get multiple descriptors - unimplemented\n" );
960 break;
961
962 case 0x000f: /* Set Multiple Descriptors (1.0) */
963 FIXME( "set multiple descriptors - unimplemented\n" );
964 break;
965
966 case 0x0100: /* Allocate DOS memory block */
967 TRACE( "allocate DOS memory block (0x%x paragraphs)\n", BX_reg(context) );
968 {
969 DWORD dw = GlobalDOSAlloc16( (DWORD)BX_reg(context) << 4 );
970 if (dw) {
971 SET_AX( context, HIWORD(dw) );
972 SET_DX( context, LOWORD(dw) );
973 } else {
974 SET_AX( context, 0x0008 ); /* insufficient memory */
975 SET_BX( context, DOSMEM_Available() >> 4 );
976 SET_CFLAG(context);
977 }
978 break;
979 }
980
981 case 0x0101: /* Free DOS memory block */
982 TRACE( "free DOS memory block (0x%04x)\n", DX_reg(context) );
983 {
984 WORD error = GlobalDOSFree16( DX_reg(context) );
985 if (error) {
986 SET_AX( context, 0x0009 ); /* memory block address invalid */
987 SET_CFLAG( context );
988 }
989 }
990 break;
991
992 case 0x0102: /* Resize DOS Memory Block */
993 FIXME( "resize DOS memory block (0x%04x, 0x%x paragraphs) - unimplemented\n",
994 DX_reg(context), BX_reg(context) );
995 break;
996
997 case 0x0200: /* get real mode interrupt vector */
998 TRACE( "get realmode interupt vector (0x%02x)\n",
999 BL_reg(context) );
1000 {
1001 FARPROC16 proc = DOSVM_GetRMHandler( BL_reg(context) );
1002 SET_CX( context, SELECTOROF(proc) );
1003 SET_DX( context, OFFSETOF(proc) );
1004 }
1005 break;
1006
1007 case 0x0201: /* set real mode interrupt vector */
1008 TRACE( "set realmode interrupt vector (0x%02x, 0x%04x:0x%04x)\n",
1009 BL_reg(context), CX_reg(context), DX_reg(context) );
1010 DOSVM_SetRMHandler( BL_reg(context),
1011 (FARPROC16)MAKESEGPTR(CX_reg(context), DX_reg(context)) );
1012 break;
1013
1014 case 0x0202: /* Get Processor Exception Handler Vector */
1015 FIXME( "Get Processor Exception Handler Vector (0x%02x)\n",
1016 BL_reg(context) );
1017 if (DOSVM_IsDos32())
1018 {
1019 SET_CX( context, 0 );
1020 context->Edx = 0;
1021 }
1022 else
1023 {
1024 SET_CX( context, 0 );
1025 SET_DX( context, 0 );
1026 }
1027 break;
1028
1029 case 0x0203: /* Set Processor Exception Handler Vector */
1030 FIXME( "Set Processor Exception Handler Vector (0x%02x)\n",
1031 BL_reg(context) );
1032 break;
1033
1034 case 0x0204: /* Get protected mode interrupt vector */
1035 TRACE("get protected mode interrupt handler (0x%02x)\n",
1036 BL_reg(context));
1037 if (DOSVM_IsDos32())
1038 {
1039 FARPROC48 handler = DOSVM_GetPMHandler48( BL_reg(context) );
1040 SET_CX( context, handler.selector );
1041 context->Edx = handler.offset;
1042 }
1043 else
1044 {
1045 FARPROC16 handler = DOSVM_GetPMHandler16( BL_reg(context) );
1046 SET_CX( context, SELECTOROF(handler) );
1047 SET_DX( context, OFFSETOF(handler) );
1048 }
1049 break;
1050
1051 case 0x0205: /* Set protected mode interrupt vector */
1052 TRACE("set protected mode interrupt handler (0x%02x,0x%04x:0x%08lx)\n",
1053 BL_reg(context), CX_reg(context), context->Edx);
1054 if (DOSVM_IsDos32())
1055 {
1056 FARPROC48 handler;
1057 handler.selector = CX_reg(context);
1058 handler.offset = context->Edx;
1059 DOSVM_SetPMHandler48( BL_reg(context), handler );
1060 }
1061 else
1062 {
1063 FARPROC16 handler;
1064 handler = (FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context));
1065 DOSVM_SetPMHandler16( BL_reg(context), handler );
1066 }
1067 break;
1068
1069 case 0x0300: /* Simulate real mode interrupt */
1070 DOSVM_CallRMInt( context );
1071 break;
1072
1073 case 0x0301: /* Call real mode procedure with far return */
1074 DOSVM_CallRMProc( context, FALSE );
1075 break;
1076
1077 case 0x0302: /* Call real mode procedure with interrupt return */
1078 DOSVM_CallRMProc( context, TRUE );
1079 break;
1080
1081 case 0x0303: /* Allocate Real Mode Callback Address */
1082 DOSVM_AllocRMCB( context );
1083 break;
1084
1085 case 0x0304: /* Free Real Mode Callback Address */
1086 DOSVM_FreeRMCB( context );
1087 break;
1088
1089 case 0x0305: /* Get State Save/Restore Addresses */
1090 TRACE("get state save/restore addresses\n");
1091 /* we probably won't need this kind of state saving */
1092 SET_AX( context, 0 );
1093
1094 /* real mode: just point to the lret */
1095 SET_BX( context, DOSVM_dpmi_segments->wrap_seg );
1096 SET_CX( context, 2 );
1097
1098 /* protected mode: don't have any handler yet... */
1099 /* FIXME: Use DI in 16-bit DPMI and EDI in 32-bit DPMI */
1100 FIXME("no protected-mode dummy state save/restore handler yet\n");
1101 SET_SI( context, 0 );
1102 context->Edi = 0;
1103 break;
1104
1105 case 0x0306: /* Get Raw Mode Switch Addresses */
1106 TRACE("get raw mode switch addresses\n");
1107
1108 /* real mode, point to standard DPMI return wrapper */
1109 SET_BX( context, DOSVM_dpmi_segments->wrap_seg );
1110 SET_CX( context, 0 );
1111
1112 /* protected mode, point to DPMI call wrapper */
1113 /* FIXME: Use DI in 16-bit DPMI and EDI in 32-bit DPMI */
1114 /* FIXME: Doesn't work in DPMI32... */
1115 SET_SI( context, DOSVM_dpmi_segments->dpmi_sel );
1116 context->Edi = 8; /* offset of the INT 0x31 call */
1117 break;
1118
1119 case 0x0400: /* Get DPMI version */
1120 TRACE("get DPMI version\n");
1121 {
1122 SYSTEM_INFO si;
1123
1124 GetSystemInfo(&si);
1125 SET_AX( context, 0x005a ); /* DPMI version 0.90 */
1126 SET_BX( context, 0x0005 ); /* Flags: 32-bit, virtual memory */
1127 SET_CL( context, si.wProcessorLevel );
1128 SET_DX( context, 0x0102 ); /* Master/slave interrupt controller base */
1129 }
1130 break;
1131
1132 case 0x0401: /* Get DPMI Capabilities (1.0) */
1133 FIXME( "get dpmi capabilities - unimplemented\n");
1134 break;
1135
1136 case 0x0500: /* Get free memory information */
1137 TRACE("get free memory information\n");
1138 {
1139 MEMMANINFO mmi;
1140 void *ptr = CTX_SEG_OFF_TO_LIN( context,
1141 context->SegEs,
1142 context->Edi );
1143
1144 mmi.dwSize = sizeof( mmi );
1145 MemManInfo16( &mmi );
1146
1147 /* the layout is just the same as MEMMANINFO, but without
1148 * the dwSize entry.
1149 */
1150 memcpy( ptr, ((char*)&mmi)+4, sizeof(mmi)-4 );
1151 break;
1152 }
1153
1154 case 0x0501: /* Allocate memory block */
1155 {
1156 DWORD size = MAKELONG( CX_reg(context), BX_reg(context) );
1157 BYTE *ptr;
1158
1159 TRACE( "allocate memory block (%ld bytes)\n", size );
1160
1161 ptr = (BYTE *)DPMI_xalloc( size );
1162 if (!ptr)
1163 {
1164 SET_AX( context, 0x8012 ); /* linear memory not available */
1165 SET_CFLAG(context);
1166 }
1167 else
1168 {
1169 SET_BX( context, HIWORD(ptr) );
1170 SET_CX( context, LOWORD(ptr) );
1171 SET_SI( context, HIWORD(ptr) );
1172 SET_DI( context, LOWORD(ptr) );
1173 }
1174 break;
1175 }
1176
1177 case 0x0502: /* Free memory block */
1178 {
1179 DWORD handle = MAKELONG( DI_reg(context), SI_reg(context) );
1180 TRACE( "free memory block (0x%08lx)\n", handle );
1181 DPMI_xfree( (void *)handle );
1182 }
1183 break;
1184
1185 case 0x0503: /* Resize memory block */
1186 {
1187 DWORD size = MAKELONG( CX_reg(context), BX_reg(context) );
1188 DWORD handle = MAKELONG( DI_reg(context), SI_reg(context) );
1189 BYTE *ptr;
1190
1191 TRACE( "resize memory block (0x%08lx, %ld bytes)\n", handle, size );
1192
1193 ptr = (BYTE *)DPMI_xrealloc( (void *)handle, size );
1194 if (!ptr)
1195 {
1196 SET_AX( context, 0x8012 ); /* linear memory not available */
1197 SET_CFLAG(context);
1198 } else {
1199 SET_BX( context, HIWORD(ptr) );
1200 SET_CX( context, LOWORD(ptr) );
1201 SET_SI( context, HIWORD(ptr) );
1202 SET_DI( context, LOWORD(ptr) );
1203 }
1204 }
1205 break;
1206
1207 case 0x0507: /* Set page attributes (1.0) */
1208 FIXME("set page attributes unimplemented\n");
1209 break; /* Just ignore it */
1210
1211 case 0x0600: /* Lock linear region */
1212 FIXME("lock linear region unimplemented\n");
1213 break; /* Just ignore it */
1214
1215 case 0x0601: /* Unlock linear region */
1216 FIXME("unlock linear region unimplemented\n");
1217 break; /* Just ignore it */
1218
1219 case 0x0602: /* Unlock real-mode region */
1220 FIXME("unlock realmode region unimplemented\n");
1221 break; /* Just ignore it */
1222
1223 case 0x0603: /* Lock real-mode region */
1224 FIXME("lock realmode region unimplemented\n");
1225 break; /* Just ignore it */
1226
1227 case 0x0604: /* Get page size */
1228 TRACE("get pagesize\n");
1229 SET_BX( context, HIWORD(getpagesize()) );
1230 SET_CX( context, LOWORD(getpagesize()) );
1231 break;
1232
1233 case 0x0702: /* Mark page as demand-paging candidate */
1234 FIXME("mark page as demand-paging candidate\n");
1235 break; /* Just ignore it */
1236
1237 case 0x0703: /* Discard page contents */
1238 FIXME("discard page contents\n");
1239 break; /* Just ignore it */
1240
1241 case 0x0800: /* Physical address mapping */
1242 FIXME( "physical address mapping (0x%08lx) - unimplemented\n",
1243 MAKELONG(CX_reg(context),BX_reg(context)) );
1244 break;
1245
1246 default:
1247 INT_BARF( context, 0x31 );
1248 SET_AX( context, 0x8001 ); /* unsupported function */
1249 SET_CFLAG(context);
1250 break;
1251 }
1252 }
Maarten's multimedia branch