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
  10 #include "config.h"
  11 #include "windef.h"
  12 #include "wine/winbase16.h"
  13 #include "wine/port.h"
  14 #include "builtin16.h"
  15 #include "miscemu.h"
  16 #include "msdos.h"
  17 #include "dosexe.h"
  18 #include "task.h"
  19 #include "toolhelp.h"
  20 #include "selectors.h"
  21 #include "callback.h"
  22 #include "debugtools.h"
  23
  24 DEFAULT_DEBUG_CHANNEL(int31);
  25
  26 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  27
  28 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  29
  30 static void* lastvalloced = NULL;
  31
  32 /* Structure for real-mode callbacks */
  33 typedef struct
  34 {
  35     DWORD edi;
  36     DWORD esi;
  37     DWORD ebp;
  38     DWORD reserved;
  39     DWORD ebx;
  40     DWORD edx;
  41     DWORD ecx;
  42     DWORD eax;
  43     WORD  fl;
  44     WORD  es;
  45     WORD  ds;
  46     WORD  fs;
  47     WORD  gs;
  48     WORD  ip;
  49     WORD  cs;
  50     WORD  sp;
  51     WORD  ss;
  52 } REALMODECALL;
  53
  54
  55
  56 typedef struct tagRMCB {
  57     DWORD address;
  58     DWORD proc_ofs,proc_sel;
  59     DWORD regs_ofs,regs_sel;
  60     struct tagRMCB *next;
  61 } RMCB;
  62
  63 static RMCB *FirstRMCB = NULL;
  64
  65
  66 static LPDOSTASK WINAPI DPMI_NoCurrent(void) { return NULL; }
  67 DOSVM_TABLE Dosvm = { DPMI_NoCurrent };
  68
  69 static HMODULE DosModule;
  70
  71 /**********************************************************************
  72  *          DPMI_LoadDosSystem
  73  */
  74 BOOL DPMI_LoadDosSystem(void)
  75 {
  76     if (DosModule) return TRUE;
  77     DosModule = LoadLibraryA( "winedos.dll" );
  78     if (!DosModule) {
  79         ERR("could not load winedos.dll, DOS subsystem unavailable\n");
  80         return FALSE;
  81     }
  82     Dosvm.Current    = (void *)GetProcAddress(DosModule, "GetCurrent");
  83     Dosvm.LoadDPMI   = (void *)GetProcAddress(DosModule, "LoadDPMI");
  84     Dosvm.LoadDosExe = (void *)GetProcAddress(DosModule, "LoadDosExe");
  85     Dosvm.Exec       = (void *)GetProcAddress(DosModule, "Exec");
  86     Dosvm.Exit       = (void *)GetProcAddress(DosModule, "Exit");
  87     Dosvm.Enter      = (void *)GetProcAddress(DosModule, "Enter");
  88     Dosvm.Wait       = (void *)GetProcAddress(DosModule, "Wait");
  89     Dosvm.QueueEvent = (void *)GetProcAddress(DosModule, "QueueEvent");
  90     Dosvm.OutPIC     = (void *)GetProcAddress(DosModule, "OutPIC");
  91     Dosvm.SetTimer   = (void *)GetProcAddress(DosModule, "SetTimer");
  92     Dosvm.GetTimer   = (void *)GetProcAddress(DosModule, "GetTimer");
  93     return TRUE;
  94 }
  95
  96 /**********************************************************************
  97  *          DPMI_xalloc
  98  * special virtualalloc, allocates lineary monoton growing memory.
  99  * (the usual VirtualAlloc does not satisfy that restriction)
 100  */
 101 static LPVOID
 102 DPMI_xalloc(int len) {
 103         LPVOID  ret;
 104         LPVOID  oldlastv = lastvalloced;
 105
 106         if (lastvalloced) {
 107                 int     xflag = 0;
 108                 ret = NULL;
 109                 while (!ret) {
 110                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 111                         if (!ret)
 112                                 lastvalloced = (char *) lastvalloced + 0x10000;
 113                         /* we failed to allocate one in the first round.
 114                          * try non-linear
 115                          */
 116                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
 117                                 FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
 118                                 xflag++;
 119                         }
 120                         /* if we even fail to allocate something in the next
 121                          * round, return NULL
 122                          */
 123                         if ((xflag==1) && (lastvalloced >= oldlastv))
 124                                 xflag++;
 125                         if ((xflag==2) && (lastvalloced < oldlastv)) {
 126                                 FIXME("failed to allocate any memory of %d bytes!\n",len);
 127                                 return NULL;
 128                         }
 129                 }
 130         } else
 131                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 132         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 133         return ret;
 134 }
 135
 136 static void
 137 DPMI_xfree(LPVOID ptr) {
 138         VirtualFree(ptr,0,MEM_RELEASE);
 139 }
 140
 141 /* FIXME: perhaps we could grow this mapped area... */
 142 static LPVOID
 143 DPMI_xrealloc(LPVOID ptr,DWORD newsize) {
 144         MEMORY_BASIC_INFORMATION        mbi;
 145         LPVOID                          newptr;
 146
 147         newptr = DPMI_xalloc(newsize);
 148         if (ptr) {
 149                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 150                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 151                         return NULL;
 152                 }
 153                 if (mbi.State == MEM_FREE) {
 154                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 155                         return NULL;
 156                 }
 157                 /* We do not shrink allocated memory. most reallocs
 158                  * only do grows anyway
 159                  */
 160                 if (newsize<=mbi.RegionSize)
 161                         return ptr;
 162                 memcpy(newptr,ptr,mbi.RegionSize);
 163                 DPMI_xfree(ptr);
 164         }
 165         return newptr;
 166 }
 167 /**********************************************************************
 168  *          INT_GetRealModeContext
 169  */
 170 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 171 {
 172     context->Eax    = call->eax;
 173     context->Ebx    = call->ebx;
 174     context->Ecx    = call->ecx;
 175     context->Edx    = call->edx;
 176     context->Esi    = call->esi;
 177     context->Edi    = call->edi;
 178     context->Ebp    = call->ebp;
 179     context->EFlags = call->fl | V86_FLAG;
 180     context->Eip    = call->ip;
 181     context->Esp    = call->sp;
 182     context->SegCs  = call->cs;
 183     context->SegDs  = call->ds;
 184     context->SegEs  = call->es;
 185     context->SegFs  = call->fs;
 186     context->SegGs  = call->gs;
 187     context->SegSs  = call->ss;
 188 }
 189
 190
 191 /**********************************************************************
 192  *          INT_SetRealModeContext
 193  */
 194 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 195 {
 196     call->eax = context->Eax;
 197     call->ebx = context->Ebx;
 198     call->ecx = context->Ecx;
 199     call->edx = context->Edx;
 200     call->esi = context->Esi;
 201     call->edi = context->Edi;
 202     call->ebp = context->Ebp;
 203     call->fl  = LOWORD(context->EFlags);
 204     call->ip  = LOWORD(context->Eip);
 205     call->sp  = LOWORD(context->Esp);
 206     call->cs  = context->SegCs;
 207     call->ds  = context->SegDs;
 208     call->es  = context->SegEs;
 209     call->fs  = context->SegFs;
 210     call->gs  = context->SegGs;
 211     call->ss  = context->SegSs;
 212 }
 213
 214 #ifdef __i386__
 215
 216 void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
 217 #if 0 /* original code, which early gccs puke on */
 218 {
 219     int _clobber;
 220     __asm__ __volatile__(
 221         "pushl %%ebp\n"
 222         "pushl %%ebx\n"
 223         "pushl %%es\n"
 224         "pushl %%ds\n"
 225         "pushfl\n"
 226         "mov %7,%%es\n"
 227         "mov %5,%%ds\n"
 228         ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
 229         "popl %%ds\n"
 230         "mov %%es,%0\n"
 231         "popl %%es\n"
 232         "popl %%ebx\n"
 233         "popl %%ebp\n"
 234     : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
 235     : "0" (ss), "2" (esp),
 236       "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
 237       "3" (&rmcb->proc_ofs) );
 238 }
 239 #else /* code generated by a gcc new enough */
 240 ;
 241 __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
 242     "pushl %ebp\n\t"
 243     "movl %esp,%ebp\n\t"
 244     "pushl %edi\n\t"
 245     "pushl %esi\n\t"
 246     "movl 0x8(%ebp),%eax\n\t"
 247     "movl 0x10(%ebp),%esi\n\t"
 248     "movl 0xc(%ebp),%edx\n\t"
 249     "movl 0x10(%eax),%ecx\n\t"
 250     "movl 0xc(%eax),%edi\n\t"
 251     "addl $0x4,%eax\n\t"
 252     "pushl %ebp\n\t"
 253     "pushl %ebx\n\t"
 254     "pushl %es\n\t"
 255     "pushl %ds\n\t"
 256     "pushfl\n\t"
 257     "mov %cx,%es\n\t"
 258     "mov %dx,%ds\n\t"
 259     ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
 260     "popl %ds\n\t"
 261     "mov %es,%dx\n\t"
 262     "popl %es\n\t"
 263     "popl %ebx\n\t"
 264     "popl %ebp\n\t"
 265     "movl 0x14(%ebp),%eax\n\t"
 266     "movw %dx,(%eax)\n\t"
 267     "movl 0x18(%ebp),%edx\n\t"
 268     "movl %edi,(%edx)\n\t"
 269     "popl %esi\n\t"
 270     "popl %edi\n\t"
 271     "leave\n\t"
 272     "ret")
 273 #endif
 274
 275 #endif /* __i386__ */
 276
 277 /**********************************************************************
 278  *          DPMI_CallRMCBProc
 279  *
 280  * This routine does the hard work of calling a callback procedure.
 281  */
 282 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
 283 {
 284     if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
 285         /* Wine-internal RMCB, call directly */
 286         ((RMCBPROC)rmcb->proc_ofs)(context);
 287     } else {
 288 #ifdef __i386__
 289         UINT16 ss,es;
 290         DWORD esp,edi;
 291
 292         INT_SetRealModeContext(MapSL(MAKESEGPTR( rmcb->regs_sel, rmcb->regs_ofs )), context);
 293         ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA );
 294         esp = context->Esp;
 295
 296         FIXME("untested!\n");
 297
 298         /* The called proc ends with an IRET, and takes these parameters:
 299          * DS:ESI = pointer to real-mode SS:SP
 300          * ES:EDI = pointer to real-mode call structure
 301          * It returns:
 302          * ES:EDI = pointer to real-mode call structure (may be a copy)
 303          * It is the proc's responsibility to change the return CS:IP in the
 304          * real-mode call structure. */
 305         if (flag & 1) {
 306             /* 32-bit DPMI client */
 307             DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
 308         } else {
 309             /* 16-bit DPMI client */
 310             CONTEXT86 ctx = *context;
 311             ctx.SegCs = rmcb->proc_sel;
 312             ctx.Eip   = rmcb->proc_ofs;
 313             ctx.SegDs = ss;
 314             ctx.Esi   = esp;
 315             ctx.SegEs = rmcb->regs_sel;
 316             ctx.Edi   = rmcb->regs_ofs;
 317             /* FIXME: I'm pretty sure this isn't right - should push flags first */
 318             wine_call_to_16_regs_short(&ctx, 0);
 319             es = ctx.SegEs;
 320             edi = ctx.Edi;
 321         }
 322         FreeSelector16(ss);
 323         INT_GetRealModeContext( MapSL( MAKESEGPTR( es, edi )), context);
 324 #else
 325         ERR("RMCBs only implemented for i386\n");
 326 #endif
 327     }
 328 }
 329
 330
 331 /**********************************************************************
 332  *          DPMI_CallRMProc
 333  *
 334  * This routine does the hard work of calling a real mode procedure.
 335  */
 336 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
 337 {
 338     LPWORD stack16;
 339     LPVOID addr = NULL; /* avoid gcc warning */
 340     LPDOSTASK lpDosTask = Dosvm.Current();
 341     RMCB *CurrRMCB;
 342     int alloc = 0, already = 0;
 343     BYTE *code;
 344
 345     TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 346                  context->Eax, context->Ebx, context->Ecx, context->Edx );
 347     TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 348                  context->Esi, context->Edi, context->SegEs, context->SegDs,
 349                  context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
 350
 351 callrmproc_again:
 352
 353 /* there might be some code that just jumps to RMCBs or the like,
 354    in which case following the jumps here might get us to a shortcut */
 355     code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
 356     switch (*code) {
 357     case 0xe9: /* JMP NEAR */
 358       context->Eip += 3 + *(WORD *)(code+1);
 359       /* yeah, I know these gotos don't look good... */
 360       goto callrmproc_again;
 361     case 0xea: /* JMP FAR */
 362       context->Eip = *(WORD *)(code+1);
 363       context->SegCs = *(WORD *)(code+3);
 364       /* ...but since the label is there anyway... */
 365       goto callrmproc_again;
 366     case 0xeb: /* JMP SHORT */
 367       context->Eip += 2 + *(signed char *)(code+1);
 368       /* ...because of other gotos below, so... */
 369       goto callrmproc_again;
 370     }
 371
 372 /* shortcut for chaining to internal interrupt handlers */
 373     if ((context->SegCs == 0xF000) && iret) {
 374         return INT_RealModeInterrupt( LOWORD(context->Eip)/4, context);
 375     }
 376
 377 /* shortcut for RMCBs */
 378     CurrRMCB = FirstRMCB;
 379
 380     while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
 381         CurrRMCB = CurrRMCB->next;
 382
 383     if (!(CurrRMCB || lpDosTask)) {
 384         FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
 385         TRACE("creating VM86 task\n");
 386         if ((!DPMI_LoadDosSystem()) || !(lpDosTask = Dosvm.LoadDPMI() )) {
 387             ERR("could not setup VM86 task\n");
 388             return 1;
 389         }
 390     }
 391     if (!already) {
 392         if (!context->SegSs) {
 393             alloc = 1; /* allocate default stack */
 394             stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
 395             context->Esp = 64-2;
 396             stack16 += 32-1;
 397             if (!addr) {
 398                 ERR("could not allocate default stack\n");
 399                 return 1;
 400             }
 401         } else {
 402             stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
 403         }
 404         context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
 405         stack16 -= args;
 406         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 407         /* push flags if iret */
 408         if (iret) {
 409             stack16--; args++;
 410             *stack16 = LOWORD(context->EFlags);
 411         }
 412         /* push return address (return to interrupt wrapper) */
 413         *(--stack16) = DOSMEM_wrap_seg;
 414         *(--stack16) = 0;
 415         /* adjust stack */
 416         context->Esp -= 2*sizeof(WORD);
 417         already = 1;
 418     }
 419
 420     if (CurrRMCB) {
 421         /* RMCB call, invoke protected-mode handler directly */
 422         DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask ? lpDosTask->dpmi_flag : 0);
 423         /* check if we returned to where we thought we would */
 424         if ((context->SegCs != DOSMEM_wrap_seg) ||
 425             (LOWORD(context->Eip) != 0)) {
 426             /* we need to continue at different address in real-mode space,
 427                so we need to set it all up for real mode again */
 428             goto callrmproc_again;
 429         }
 430     } else {
 431         TRACE("entering real mode...\n");
 432         Dosvm.Enter( context );
 433         TRACE("returned from real-mode call\n");
 434     }
 435     if (alloc) DOSMEM_FreeBlock( addr );
 436     return 0;
 437 }
 438
 439
 440 /**********************************************************************
 441  *          CallRMInt
 442  */
 443 static void CallRMInt( CONTEXT86 *context )
 444 {
 445     CONTEXT86 realmode_ctx;
 446     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 447     REALMODECALL *call = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) ));
 448     INT_GetRealModeContext( call, &realmode_ctx );
 449
 450     /* we need to check if a real-mode program has hooked the interrupt */
 451     if (HIWORD(rm_int)!=0xF000) {
 452         /* yup, which means we need to switch to real mode... */
 453         realmode_ctx.SegCs = HIWORD(rm_int);
 454         realmode_ctx.Eip   = LOWORD(rm_int);
 455         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 456           SET_CFLAG(context);
 457     } else {
 458         RESET_CFLAG(context);
 459         /* use the IP we have instead of BL_reg, in case some apps
 460            decide to move interrupts around for whatever reason... */
 461         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 462           SET_CFLAG(context);
 463         if (context->EFlags & 1) {
 464           FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 465                 BL_reg(context), realmode_ctx.Eax, realmode_ctx.Ebx,
 466                 realmode_ctx.Ecx, realmode_ctx.Edx);
 467           FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 468                 realmode_ctx.Esi, realmode_ctx.Edi,
 469                 realmode_ctx.SegDs, realmode_ctx.SegEs );
 470         }
 471     }
 472     INT_SetRealModeContext( call, &realmode_ctx );
 473 }
 474
 475
 476 static void CallRMProc( CONTEXT86 *context, int iret )
 477 {
 478     REALMODECALL *p = MapSL( MAKESEGPTR( context->SegEs, DI_reg(context) ));
 479     CONTEXT86 context16;
 480
 481     TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 482         p->eax, p->ebx, p->ecx, p->edx);
 483     TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 484         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 485
 486     if (!(p->cs) && !(p->ip)) { /* remove this check
 487                                    if Int21/6501 case map function
 488                                    has been implemented */
 489         SET_CFLAG(context);
 490         return;
 491     }
 492     INT_GetRealModeContext(p, &context16);
 493     DPMI_CallRMProc( &context16, ((LPWORD)MapSL(MAKESEGPTR(context->SegSs, LOWORD(context->Esp))))+3,
 494                      CX_reg(context), iret );
 495     INT_SetRealModeContext(p, &context16);
 496 }
 497
 498
 499 static RMCB *DPMI_AllocRMCB( void )
 500 {
 501     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 502     UINT16 uParagraph;
 503
 504     if (NewRMCB)
 505     {
 506         LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
 507         LPBYTE p = RMCBmem;
 508
 509         *p++ = 0xcd; /* RMCB: */
 510         *p++ = 0x31; /* int $0x31 */
 511 /* it is the called procedure's task to change the return CS:EIP
 512    the DPMI 0.9 spec states that if it doesn't, it will be called again */
 513         *p++ = 0xeb;
 514         *p++ = 0xfc; /* jmp RMCB */
 515         NewRMCB->address = MAKELONG(0, uParagraph);
 516         NewRMCB->next = FirstRMCB;
 517         FirstRMCB = NewRMCB;
 518     }
 519     return NewRMCB;
 520 }
 521
 522
 523 static void AllocRMCB( CONTEXT86 *context )
 524 {
 525     RMCB *NewRMCB = DPMI_AllocRMCB();
 526
 527     TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
 528
 529     if (NewRMCB)
 530     {
 531         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 532         NewRMCB->proc_ofs = LOWORD(context->Esi);
 533         NewRMCB->proc_sel = context->SegDs;
 534         NewRMCB->regs_ofs = LOWORD(context->Edi);
 535         NewRMCB->regs_sel = context->SegEs;
 536         SET_LOWORD( context->Ecx, HIWORD(NewRMCB->address) );
 537         SET_LOWORD( context->Edx, LOWORD(NewRMCB->address) );
 538     }
 539     else
 540     {
 541         SET_LOWORD( context->Eax, 0x8015 ); /* callback unavailable */
 542         SET_CFLAG(context);
 543     }
 544 }
 545
 546
 547 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 548 {
 549     RMCB *NewRMCB = DPMI_AllocRMCB();
 550
 551     if (NewRMCB) {
 552         NewRMCB->proc_ofs = (DWORD)proc;
 553         NewRMCB->proc_sel = 0;
 554         NewRMCB->regs_ofs = 0;
 555         NewRMCB->regs_sel = 0;
 556         return (FARPROC16)(NewRMCB->address);
 557     }
 558     return NULL;
 559 }
 560
 561
 562 static int DPMI_FreeRMCB( DWORD address )
 563 {
 564     RMCB *CurrRMCB = FirstRMCB;
 565     RMCB *PrevRMCB = NULL;
 566
 567     while (CurrRMCB && (CurrRMCB->address != address))
 568     {
 569         PrevRMCB = CurrRMCB;
 570         CurrRMCB = CurrRMCB->next;
 571     }
 572     if (CurrRMCB)
 573     {
 574         if (PrevRMCB)
 575         PrevRMCB->next = CurrRMCB->next;
 576             else
 577         FirstRMCB = CurrRMCB->next;
 578         DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(CurrRMCB->address));
 579         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 580         return 0;
 581     }
 582     return 1;
 583 }
 584
 585
 586 static void FreeRMCB( CONTEXT86 *context )
 587 {
 588     FIXME("callback address: %04x:%04x\n",
 589           CX_reg(context), DX_reg(context));
 590
 591     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 592         SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
 593         SET_CFLAG(context);
 594     }
 595 }
 596
 597
 598 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 599 {
 600     DPMI_FreeRMCB( (DWORD)proc );
 601 }
 602
 603
 604 /* (see dosmem.c, function DOSMEM_InitDPMI) */
 605
 606 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 607 {
 608     UINT16 cs, ss, ds, es;
 609     CONTEXT86 pm_ctx;
 610     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 611     PDB16 *psp = (PDB16 *)psp_ofs;
 612     HANDLE16 env_seg = psp->environment;
 613     unsigned char selflags = WINE_LDT_FLAGS_DATA;
 614
 615     RESET_CFLAG(context);
 616     lpDosTask->dpmi_flag = AX_reg(context);
 617 /* our mode switch wrapper have placed the desired CS into DX */
 618     cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE );
 619 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 620    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 621    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 622    32-bit code using this stack. */
 623     if (lpDosTask->dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
 624     ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags );
 625 /* do the same for the data segments, just in case */
 626     if (context->SegDs == context->SegSs) ds = ss;
 627     else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags );
 628     es = SELECTOR_AllocBlock( psp, 0x100, selflags );
 629 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 630     psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA );
 631
 632     pm_ctx = *context;
 633     pm_ctx.SegCs = DOSMEM_dpmi_sel;
 634 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 635     pm_ctx.Eax   = ss;
 636     pm_ctx.Edx   = cs;
 637     pm_ctx.SegDs = ds;
 638     pm_ctx.SegEs = es;
 639     pm_ctx.SegFs = 0;
 640     pm_ctx.SegGs = 0;
 641
 642     TRACE("DOS program is now entering protected mode\n");
 643     wine_call_to_16_regs_short(&pm_ctx, 0);
 644
 645     /* in the current state of affairs, we won't ever actually return here... */
 646     /* we should have int21/ah=4c do it someday, though... */
 647
 648     FreeSelector16(psp->environment);
 649     psp->environment = env_seg;
 650     FreeSelector16(es);
 651     if (ds != ss) FreeSelector16(ds);
 652     FreeSelector16(ss);
 653     FreeSelector16(cs);
 654 }
 655
 656 /* DPMI Raw Mode Switch handler */
 657
 658 #if 0
 659 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 660 {
 661   LPDOSTASK lpDosTask = Dosvm.Current();
 662   CONTEXT86 rm_ctx;
 663   int ret;
 664
 665   if (!lpDosTask) {
 666     /* we could probably start a DPMI-only dosmod task here, but I doubt
 667        anything other than real DOS apps want to call raw mode switch */
 668     ERR("attempting raw mode switch without DOS task!\n");
 669     ExitProcess(1);
 670   }
 671   /* initialize real-mode context as per spec */
 672   memset(&rm_ctx, 0, sizeof(rm_ctx));
 673   rm_ctx.SegDs  = AX_sig(context);
 674   rm_ctx.SegEs  = CX_sig(context);
 675   rm_ctx.SegSs  = DX_sig(context);
 676   rm_ctx.Esp    = EBX_sig(context);
 677   rm_ctx.SegCs  = SI_sig(context);
 678   rm_ctx.Eip    = EDI_sig(context);
 679   rm_ctx.Ebp    = EBP_sig(context);
 680   rm_ctx.SegFs  = 0;
 681   rm_ctx.SegGs  = 0;
 682   rm_ctx.EFlags = EFL_sig(context); /* at least we need the IF flag */
 683
 684   /* enter real mode again */
 685   TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
 686   ret = Dosvm.Enter( &rm_ctx );
 687   /* when the real-mode stuff call its mode switch address,
 688      Dosvm.Enter will return and we will continue here */
 689
 690   if (ret<0) {
 691     /* if the sync was lost, there's no way to recover */
 692     ExitProcess(1);
 693   }
 694
 695   /* alter protected-mode context as per spec */
 696   DS_sig(context)  = LOWORD(rm_ctx.Eax);
 697   ES_sig(context)  = LOWORD(rm_ctx.Ecx);
 698   SS_sig(context)  = LOWORD(rm_ctx.Edx);
 699   ESP_sig(context) = rm_ctx.Ebx;
 700   CS_sig(context)  = LOWORD(rm_ctx.Esi);
 701   EIP_sig(context) = rm_ctx.Edi;
 702   EBP_sig(context) = rm_ctx.Ebp;
 703   FS_sig(context) = 0;
 704   GS_sig(context) = 0;
 705
 706   /* Return to new address and hope that we didn't mess up */
 707   TRACE("re-entering protected mode at %04x:%08lx\n",
 708         CS_sig(context), EIP_sig(context));
 709 }
 710 #endif
 711
 712
 713 /**********************************************************************
 714  *          INT_Int31Handler
 715  *
 716  * Handler for int 31h (DPMI).
 717  */
 718
 719 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 720 {
 721     /*
 722      * Note: For Win32s processes, the whole linear address space is
 723      *       shifted by 0x10000 relative to the OS linear address space.
 724      *       See the comment in msdos/vxd.c.
 725      */
 726     DWORD dw;
 727     BYTE *ptr;
 728
 729     LPDOSTASK lpDosTask = Dosvm.Current();
 730
 731     if (ISV86(context) && lpDosTask) {
 732         /* Called from real mode, check if it's our wrapper */
 733         TRACE("called from real mode\n");
 734         if (context->SegCs==DOSMEM_dpmi_seg) {
 735             /* This is the protected mode switch */
 736             StartPM(context,lpDosTask);
 737             return;
 738         } else
 739         if (context->SegCs==DOSMEM_xms_seg) {
 740             /* This is the XMS driver entry point */
 741             XMS_Handler(context);
 742             return;
 743         } else
 744         {
 745             /* Check for RMCB */
 746             RMCB *CurrRMCB = FirstRMCB;
 747
 748             while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
 749                 CurrRMCB = CurrRMCB->next;
 750
 751             if (CurrRMCB) {
 752                 /* RMCB call, propagate to protected-mode handler */
 753                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 754                 return;
 755             }
 756         }
 757     }
 758
 759     RESET_CFLAG(context);
 760     switch(AX_reg(context))
 761     {
 762     case 0x0000:  /* Allocate LDT descriptors */
 763         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 764         if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
 765         {
 766             TRACE("failed\n");
 767             context->Eax = 0x8011;  /* descriptor unavailable */
 768             SET_CFLAG(context);
 769         }
 770         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 771         break;
 772
 773     case 0x0001:  /* Free LDT descriptor */
 774         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 775         if (FreeSelector16( BX_reg(context) ))
 776         {
 777             context->Eax = 0x8022;  /* invalid selector */
 778             SET_CFLAG(context);
 779         }
 780         else
 781         {
 782             /* If a segment register contains the selector being freed, */
 783             /* set it to zero. */
 784             if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
 785             if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
 786             if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
 787             if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
 788         }
 789         break;
 790
 791     case 0x0002:  /* Real mode segment to descriptor */
 792         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 793         {
 794             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 795             switch(BX_reg(context))
 796             {
 797             case 0x0000: entryPoint = 183; break;  /* __0000H */
 798             case 0x0040: entryPoint = 193; break;  /* __0040H */
 799             case 0xa000: entryPoint = 174; break;  /* __A000H */
 800             case 0xb000: entryPoint = 181; break;  /* __B000H */
 801             case 0xb800: entryPoint = 182; break;  /* __B800H */
 802             case 0xc000: entryPoint = 195; break;  /* __C000H */
 803             case 0xd000: entryPoint = 179; break;  /* __D000H */
 804             case 0xe000: entryPoint = 190; break;  /* __E000H */
 805             case 0xf000: entryPoint = 194; break;  /* __F000H */
 806             default:
 807                 context->Eax = DOSMEM_AllocSelector(BX_reg(context));
 808                 break;
 809             }
 810             if (entryPoint)
 811                 context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
 812                                                         (LPCSTR)(ULONG_PTR)entryPoint ));
 813         }
 814         break;
 815
 816     case 0x0003:  /* Get next selector increment */
 817         TRACE("get selector increment (__AHINCR)\n");
 818         context->Eax = __AHINCR;
 819         break;
 820
 821     case 0x0004:  /* Lock selector (not supported) */
 822         FIXME("lock selector not supported\n");
 823         context->Eax = 0;  /* FIXME: is this a correct return value? */
 824         break;
 825
 826     case 0x0005:  /* Unlock selector (not supported) */
 827         FIXME("unlock selector not supported\n");
 828         context->Eax = 0;  /* FIXME: is this a correct return value? */
 829         break;
 830
 831     case 0x0006:  /* Get selector base address */
 832         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 833         if (!(dw = GetSelectorBase( BX_reg(context) )))
 834         {
 835             context->Eax = 0x8022;  /* invalid selector */
 836             SET_CFLAG(context);
 837         }
 838         else
 839         {
 840             CX_reg(context) = HIWORD(W32S_WINE2APP(dw));
 841             DX_reg(context) = LOWORD(W32S_WINE2APP(dw));
 842         }
 843         break;
 844
 845     case 0x0007:  /* Set selector base address */
 846         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 847                      BX_reg(context),
 848                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context))));
 849         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)));
 850         if (dw < 0x10000)
 851             /* app wants to access lower 64K of DOS memory, map it in now */
 852             DOSMEM_Init(TRUE);
 853         SetSelectorBase(BX_reg(context), dw);
 854         break;
 855
 856     case 0x0008:  /* Set selector limit */
 857         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 858         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 859         SetSelectorLimit16( BX_reg(context), dw );
 860         break;
 861
 862     case 0x0009:  /* Set selector access rights */
 863         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 864         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 865         break;
 866
 867     case 0x000a:  /* Allocate selector alias */
 868         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 869         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 870         {
 871             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 872             SET_CFLAG(context);
 873         }
 874         break;
 875
 876     case 0x000b:  /* Get descriptor */
 877         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 878         {
 879             LDT_ENTRY entry;
 880             wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry)) );
 881             /* FIXME: should use ES:EDI for 32-bit clients */
 882             *(LDT_ENTRY *)MapSL( MAKESEGPTR( context->SegEs, LOWORD(context->Edi) )) = entry;
 883         }
 884         break;
 885
 886     case 0x000c:  /* Set descriptor */
 887         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 888         {
 889             LDT_ENTRY entry = *(LDT_ENTRY *)MapSL(MAKESEGPTR( context->SegEs, LOWORD(context->Edi)));
 890             wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry)) );
 891             wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
 892         }
 893         break;
 894
 895     case 0x000d:  /* Allocate specific LDT descriptor */
 896         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 897         AX_reg(context) = 0x8011; /* descriptor unavailable */
 898         SET_CFLAG(context);
 899         break;
 900     case 0x0100:  /* Allocate DOS memory block */
 901         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 902         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 903         if (dw) {
 904             AX_reg(context) = HIWORD(dw);
 905             DX_reg(context) = LOWORD(dw);
 906         } else {
 907             AX_reg(context) = 0x0008; /* insufficient memory */
 908             BX_reg(context) = DOSMEM_Available()>>4;
 909             SET_CFLAG(context);
 910         }
 911         break;
 912     case 0x0101:  /* Free DOS memory block */
 913         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 914         dw = GlobalDOSFree16(DX_reg(context));
 915         if (!dw) {
 916             AX_reg(context) = 0x0009; /* memory block address invalid */
 917             SET_CFLAG(context);
 918         }
 919         break;
 920     case 0x0200: /* get real mode interrupt vector */
 921         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 922               BL_reg(context));
 923         SET_CFLAG(context);
 924         break;
 925     case 0x0201: /* set real mode interrupt vector */
 926         FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 927         SET_CFLAG(context);
 928         break;
 929     case 0x0204:  /* Get protected mode interrupt vector */
 930         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 931         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 932         CX_reg(context) = HIWORD(dw);
 933         DX_reg(context) = LOWORD(dw);
 934         break;
 935
 936     case 0x0205:  /* Set protected mode interrupt vector */
 937         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
 938             BL_reg(context),MapSL(MAKESEGPTR(CX_reg(context),DX_reg(context))));
 939         INT_SetPMHandler( BL_reg(context),
 940                           (FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context) ));
 941         break;
 942
 943     case 0x0300:  /* Simulate real mode interrupt */
 944         CallRMInt( context );
 945         break;
 946
 947     case 0x0301:  /* Call real mode procedure with far return */
 948         CallRMProc( context, FALSE );
 949         break;
 950
 951     case 0x0302:  /* Call real mode procedure with interrupt return */
 952         CallRMProc( context, TRUE );
 953         break;
 954
 955     case 0x0303:  /* Allocate Real Mode Callback Address */
 956         AllocRMCB( context );
 957         break;
 958
 959     case 0x0304:  /* Free Real Mode Callback Address */
 960         FreeRMCB( context );
 961         break;
 962
 963     case 0x0305:  /* Get State Save/Restore Addresses */
 964         TRACE("get state save/restore addresses\n");
 965         /* we probably won't need this kind of state saving */
 966         AX_reg(context) = 0;
 967         /* real mode: just point to the lret */
 968         BX_reg(context) = DOSMEM_wrap_seg;
 969         context->Ecx = 2;
 970         /* protected mode: don't have any handler yet... */
 971         FIXME("no protected-mode dummy state save/restore handler yet\n");
 972         SI_reg(context) = 0;
 973         context->Edi = 0;
 974         break;
 975
 976     case 0x0306:  /* Get Raw Mode Switch Addresses */
 977         TRACE("get raw mode switch addresses\n");
 978         /* real mode, point to standard DPMI return wrapper */
 979         BX_reg(context) = DOSMEM_wrap_seg;
 980         context->Ecx = 0;
 981         /* protected mode, point to DPMI call wrapper */
 982         SI_reg(context) = DOSMEM_dpmi_sel;
 983         context->Edi = 8; /* offset of the INT 0x31 call */
 984         break;
 985     case 0x0400:  /* Get DPMI version */
 986         TRACE("get DPMI version\n");
 987         {
 988             SYSTEM_INFO si;
 989
 990             GetSystemInfo(&si);
 991             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 992             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 993             CL_reg(context) = si.wProcessorLevel;
 994             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 995             break;
 996         }
 997     case 0x0500:  /* Get free memory information */
 998         TRACE("get free memory information\n");
 999         {
1000             MEMMANINFO mmi;
1001
1002             mmi.dwSize = sizeof(mmi);
1003             MemManInfo16(&mmi);
1004             ptr = MapSL(MAKESEGPTR(context->SegEs,DI_reg(context)));
1005             /* the layout is just the same as MEMMANINFO, but without
1006              * the dwSize entry.
1007              */
1008             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
1009             break;
1010         }
1011     case 0x0501:  /* Allocate memory block */
1012         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1013         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
1014         {
1015             AX_reg(context) = 0x8012;  /* linear memory not available */
1016             SET_CFLAG(context);
1017         } else {
1018             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr));
1019             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr));
1020         }
1021         break;
1022
1023     case 0x0502:  /* Free memory block */
1024         TRACE("free memory block (0x%08lx)\n",
1025                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))));
1026         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context), SI_reg(context))) );
1027         break;
1028
1029     case 0x0503:  /* Resize memory block */
1030         TRACE("resize memory block (0x%08lx,%ld)\n",
1031                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
1032                      MAKELONG(CX_reg(context),BX_reg(context)));
1033         if (!(ptr = (BYTE *)DPMI_xrealloc(
1034                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
1035                 MAKELONG(CX_reg(context),BX_reg(context)))))
1036         {
1037             AX_reg(context) = 0x8012;  /* linear memory not available */
1038             SET_CFLAG(context);
1039         } else {
1040             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr));
1041             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr));
1042         }
1043         break;
1044
1045     case 0x0507:  /* Modify page attributes */
1046         FIXME("modify page attributes unimplemented\n");
1047         break;  /* Just ignore it */
1048
1049     case 0x0600:  /* Lock linear region */
1050         FIXME("lock linear region unimplemented\n");
1051         break;  /* Just ignore it */
1052
1053     case 0x0601:  /* Unlock linear region */
1054         FIXME("unlock linear region unimplemented\n");
1055         break;  /* Just ignore it */
1056
1057     case 0x0602:  /* Unlock real-mode region */
1058         FIXME("unlock realmode region unimplemented\n");
1059         break;  /* Just ignore it */
1060
1061     case 0x0603:  /* Lock real-mode region */
1062         FIXME("lock realmode region unimplemented\n");
1063         break;  /* Just ignore it */
1064
1065     case 0x0604:  /* Get page size */
1066         TRACE("get pagesize\n");
1067         BX_reg(context) = 0;
1068         CX_reg(context) = getpagesize();
1069         break;
1070
1071     case 0x0702:  /* Mark page as demand-paging candidate */
1072         FIXME("mark page as demand-paging candidate\n");
1073         break;  /* Just ignore it */
1074
1075     case 0x0703:  /* Discard page contents */
1076         FIXME("discard page contents\n");
1077         break;  /* Just ignore it */
1078
1079      case 0x0800:  /* Physical address mapping */
1080         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1081          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1082          {
1083              AX_reg(context) = 0x8021;
1084              SET_CFLAG(context);
1085          }
1086          else
1087          {
1088              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr));
1089              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr));
1090              RESET_CFLAG(context);
1091          }
1092          break;
1093
1094     default:
1095         INT_BARF( context, 0x31 );
1096         AX_reg(context) = 0x8001;  /* unsupported function */
1097         SET_CFLAG(context);
1098         break;
1099     }
1100
1101 }