msdos/dpmi.c

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