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 #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 ) ) < 32) {
 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 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) = AllocSelectorArray( 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 (FreeSelector( 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         SetSelectorLimit( 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         SelectorAccessRights( 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) = AllocCStoDSAlias( 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 = GlobalDOSAlloc((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 = GlobalDOSFree(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             MemManInfo(&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 }