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 "ldt.h"
  14 #include "builtin16.h"
  15 #include "global.h"
  16 #include "miscemu.h"
  17 #include "msdos.h"
  18 #include "dosexe.h"
  19 #include "task.h"
  20 #include "toolhelp.h"
  21 #include "selectors.h"
  22 #include "process.h"
  23 #include "callback.h"
  24 #include "debugtools.h"
  25
  26 DEFAULT_DEBUG_CHANNEL(int31);
  27
  28 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  29
  30 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  31
  32 static void* lastvalloced = NULL;
  33
  34 /* Structure for real-mode callbacks */
  35 typedef struct
  36 {
  37     DWORD edi;
  38     DWORD esi;
  39     DWORD ebp;
  40     DWORD reserved;
  41     DWORD ebx;
  42     DWORD edx;
  43     DWORD ecx;
  44     DWORD eax;
  45     WORD  fl;
  46     WORD  es;
  47     WORD  ds;
  48     WORD  fs;
  49     WORD  gs;
  50     WORD  ip;
  51     WORD  cs;
  52     WORD  sp;
  53     WORD  ss;
  54 } REALMODECALL;
  55
  56
  57
  58 typedef struct tagRMCB {
  59     DWORD address;
  60     DWORD proc_ofs,proc_sel;
  61     DWORD regs_ofs,regs_sel;
  62     struct tagRMCB *next;
  63 } RMCB;
  64
  65 static RMCB *FirstRMCB = NULL;
  66
  67
  68 /**********************************************************************
  69  *          DPMI_xalloc
  70  * special virtualalloc, allocates lineary monoton growing memory.
  71  * (the usual VirtualAlloc does not satisfy that restriction)
  72  */
  73 static LPVOID
  74 DPMI_xalloc(int len) {
  75         LPVOID  ret;
  76         LPVOID  oldlastv = lastvalloced;
  77
  78         if (lastvalloced) {
  79                 int     xflag = 0;
  80                 ret = NULL;
  81                 while (!ret) {
  82                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  83                         if (!ret)
  84                                 lastvalloced = (char *) lastvalloced + 0x10000;
  85                         /* we failed to allocate one in the first round.
  86                          * try non-linear
  87                          */
  88                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  89                                 FIXME("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("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,DWORD 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("realloc of DPMI_xallocd region %p?\n",ptr);
 123                         return NULL;
 124                 }
 125                 if (mbi.State == MEM_FREE) {
 126                         FIXME("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, CONTEXT86 *context )
 143 {
 144     context->Eax    = call->eax;
 145     context->Ebx    = call->ebx;
 146     context->Ecx    = call->ecx;
 147     context->Edx    = call->edx;
 148     context->Esi    = call->esi;
 149     context->Edi    = call->edi;
 150     context->Ebp    = call->ebp;
 151     context->EFlags = call->fl | V86_FLAG;
 152     context->Eip    = call->ip;
 153     context->Esp    = call->sp;
 154     context->SegCs  = call->cs;
 155     context->SegDs  = call->ds;
 156     context->SegEs  = call->es;
 157     context->SegFs  = call->fs;
 158     context->SegGs  = call->gs;
 159     context->SegSs  = call->ss;
 160 }
 161
 162
 163 /**********************************************************************
 164  *          INT_SetRealModeContext
 165  */
 166 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 167 {
 168     call->eax = context->Eax;
 169     call->ebx = context->Ebx;
 170     call->ecx = context->Ecx;
 171     call->edx = context->Edx;
 172     call->esi = context->Esi;
 173     call->edi = context->Edi;
 174     call->ebp = context->Ebp;
 175     call->fl  = LOWORD(context->EFlags);
 176     call->ip  = LOWORD(context->Eip);
 177     call->sp  = LOWORD(context->Esp);
 178     call->cs  = context->SegCs;
 179     call->ds  = context->SegDs;
 180     call->es  = context->SegEs;
 181     call->fs  = context->SegFs;
 182     call->gs  = context->SegGs;
 183     call->ss  = context->SegSs;
 184 }
 185
 186 #ifdef __i386__
 187
 188 void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
 189 #if 0 /* original code, which early gccs puke on */
 190 {
 191     int _clobber;
 192     __asm__ __volatile__(
 193         "pushl %%ebp\n"
 194         "pushl %%ebx\n"
 195         "pushl %%es\n"
 196         "pushl %%ds\n"
 197         "pushfl\n"
 198         "mov %7,%%es\n"
 199         "mov %5,%%ds\n"
 200         ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
 201         "popl %%ds\n"
 202         "mov %%es,%0\n"
 203         "popl %%es\n"
 204         "popl %%ebx\n"
 205         "popl %%ebp\n"
 206     : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
 207     : "0" (ss), "2" (esp),
 208       "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
 209       "3" (&rmcb->proc_ofs) );
 210 }
 211 #else /* code generated by a gcc new enough */
 212 ;
 213 __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
 214     "pushl %ebp\n\t"
 215     "movl %esp,%ebp\n\t"
 216     "pushl %edi\n\t"
 217     "pushl %esi\n\t"
 218     "movl 0x8(%ebp),%eax\n\t"
 219     "movl 0x10(%ebp),%esi\n\t"
 220     "movl 0xc(%ebp),%edx\n\t"
 221     "movl 0x10(%eax),%ecx\n\t"
 222     "movl 0xc(%eax),%edi\n\t"
 223     "addl $0x4,%eax\n\t"
 224     "pushl %ebp\n\t"
 225     "pushl %ebx\n\t"
 226     "pushl %es\n\t"
 227     "pushl %ds\n\t"
 228     "pushfl\n\t"
 229     "mov %cx,%es\n\t"
 230     "mov %dx,%ds\n\t"
 231     ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
 232     "popl %ds\n\t"
 233     "mov %es,%dx\n\t"
 234     "popl %es\n\t"
 235     "popl %ebx\n\t"
 236     "popl %ebp\n\t"
 237     "movl 0x14(%ebp),%eax\n\t"
 238     "movw %dx,(%eax)\n\t"
 239     "movl 0x18(%ebp),%edx\n\t"
 240     "movl %edi,(%edx)\n\t"
 241     "popl %esi\n\t"
 242     "popl %edi\n\t"
 243     "leave\n\t"
 244     "ret")
 245 #endif
 246
 247 #endif /* __i386__ */
 248
 249 /**********************************************************************
 250  *          DPMI_CallRMCBProc
 251  *
 252  * This routine does the hard work of calling a callback procedure.
 253  */
 254 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
 255 {
 256     if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
 257         /* Wine-internal RMCB, call directly */
 258         ((RMCBPROC)rmcb->proc_ofs)(context);
 259     } else {
 260 #ifdef __i386__
 261         UINT16 ss,es;
 262         DWORD esp,edi;
 263
 264         INT_SetRealModeContext((REALMODECALL *)PTR_SEG_OFF_TO_LIN( rmcb->regs_sel, rmcb->regs_ofs ), context);
 265         ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA );
 266         esp = context->Esp;
 267
 268         FIXME("untested!\n");
 269
 270         /* The called proc ends with an IRET, and takes these parameters:
 271          * DS:ESI = pointer to real-mode SS:SP
 272          * ES:EDI = pointer to real-mode call structure
 273          * It returns:
 274          * ES:EDI = pointer to real-mode call structure (may be a copy)
 275          * It is the proc's responsibility to change the return CS:IP in the
 276          * real-mode call structure. */
 277         if (flag & 1) {
 278             /* 32-bit DPMI client */
 279             DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
 280         } else {
 281             /* 16-bit DPMI client */
 282             CONTEXT86 ctx = *context;
 283             ctx.SegCs = rmcb->proc_sel;
 284             ctx.Eip   = rmcb->proc_ofs;
 285             ctx.SegDs = ss;
 286             ctx.Esi   = esp;
 287             ctx.SegEs = rmcb->regs_sel;
 288             ctx.Edi   = rmcb->regs_ofs;
 289             /* FIXME: I'm pretty sure this isn't right - should push flags first */
 290             wine_call_to_16_regs_short(&ctx, 0);
 291             es = ctx.SegEs;
 292             edi = ctx.Edi;
 293         }
 294         FreeSelector16(ss);
 295         INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
 296 #else
 297         ERR("RMCBs only implemented for i386\n");
 298 #endif
 299     }
 300 }
 301
 302
 303 /**********************************************************************
 304  *          DPMI_CallRMProc
 305  *
 306  * This routine does the hard work of calling a real mode procedure.
 307  */
 308 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
 309 {
 310     LPWORD stack16;
 311     LPVOID addr = NULL; /* avoid gcc warning */
 312     LPDOSTASK lpDosTask = MZ_Current();
 313     RMCB *CurrRMCB;
 314     int alloc = 0, already = 0;
 315     BYTE *code;
 316
 317     GlobalUnlock16( GetCurrentTask() );
 318
 319     TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 320                  context->Eax, context->Ebx, context->Ecx, context->Edx );
 321     TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 322                  context->Esi, context->Edi, context->SegEs, context->SegDs,
 323                  context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
 324
 325 callrmproc_again:
 326
 327 /* there might be some code that just jumps to RMCBs or the like,
 328    in which case following the jumps here might get us to a shortcut */
 329     code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
 330     switch (*code) {
 331     case 0xe9: /* JMP NEAR */
 332       context->Eip += 3 + *(WORD *)(code+1);
 333       /* yeah, I know these gotos don't look good... */
 334       goto callrmproc_again;
 335     case 0xea: /* JMP FAR */
 336       context->Eip = *(WORD *)(code+1);
 337       context->SegCs = *(WORD *)(code+3);
 338       /* ...but since the label is there anyway... */
 339       goto callrmproc_again;
 340     case 0xeb: /* JMP SHORT */
 341       context->Eip += 2 + *(signed char *)(code+1);
 342       /* ...because of other gotos below, so... */
 343       goto callrmproc_again;
 344     }
 345
 346 /* shortcut for chaining to internal interrupt handlers */
 347     if ((context->SegCs == 0xF000) && iret) {
 348         return INT_RealModeInterrupt( LOWORD(context->Eip)/4, context);
 349     }
 350
 351 /* shortcut for RMCBs */
 352     CurrRMCB = FirstRMCB;
 353
 354     while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
 355         CurrRMCB = CurrRMCB->next;
 356
 357     if (!(CurrRMCB || lpDosTask)) {
 358         FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
 359         TRACE("creating VM86 task\n");
 360         if (!(lpDosTask = MZ_AllocDPMITask() )) {
 361             ERR("could not setup VM86 task\n");
 362             return 1;
 363         }
 364     }
 365     if (!already) {
 366         if (!context->SegSs) {
 367             alloc = 1; /* allocate default stack */
 368             stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
 369             context->Esp = 64-2;
 370             stack16 += 32-1;
 371             if (!addr) {
 372                 ERR("could not allocate default stack\n");
 373                 return 1;
 374             }
 375         } else {
 376             stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
 377         }
 378         context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
 379         stack16 -= args;
 380         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 381         /* push flags if iret */
 382         if (iret) {
 383             stack16--; args++;
 384             *stack16 = LOWORD(context->EFlags);
 385         }
 386         /* push return address (return to interrupt wrapper) */
 387         *(--stack16) = DOSMEM_wrap_seg;
 388         *(--stack16) = 0;
 389         /* adjust stack */
 390         context->Esp -= 2*sizeof(WORD);
 391         already = 1;
 392     }
 393
 394     if (CurrRMCB) {
 395         /* RMCB call, invoke protected-mode handler directly */
 396         DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask ? lpDosTask->dpmi_flag : 0);
 397         /* check if we returned to where we thought we would */
 398         if ((context->SegCs != DOSMEM_wrap_seg) ||
 399             (LOWORD(context->Eip) != 0)) {
 400             /* we need to continue at different address in real-mode space,
 401                so we need to set it all up for real mode again */
 402             goto callrmproc_again;
 403         }
 404     } else {
 405         TRACE("entering real mode...\n");
 406         DOSVM_Enter( context );
 407         TRACE("returned from real-mode call\n");
 408     }
 409     if (alloc) DOSMEM_FreeBlock( addr );
 410     return 0;
 411 }
 412
 413
 414 /**********************************************************************
 415  *          CallRMInt
 416  */
 417 static void CallRMInt( CONTEXT86 *context )
 418 {
 419     CONTEXT86 realmode_ctx;
 420     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 421     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( context->SegEs,
 422                                                           DI_reg(context) );
 423     INT_GetRealModeContext( call, &realmode_ctx );
 424
 425     /* we need to check if a real-mode program has hooked the interrupt */
 426     if (HIWORD(rm_int)!=0xF000) {
 427         /* yup, which means we need to switch to real mode... */
 428         realmode_ctx.SegCs = HIWORD(rm_int);
 429         realmode_ctx.Eip   = LOWORD(rm_int);
 430         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 431           SET_CFLAG(context);
 432     } else {
 433         RESET_CFLAG(context);
 434         /* use the IP we have instead of BL_reg, in case some apps
 435            decide to move interrupts around for whatever reason... */
 436         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 437           SET_CFLAG(context);
 438         if (context->EFlags & 1) {
 439           FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 440                 BL_reg(context), realmode_ctx.Eax, realmode_ctx.Ebx,
 441                 realmode_ctx.Ecx, realmode_ctx.Edx);
 442           FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 443                 realmode_ctx.Esi, realmode_ctx.Edi,
 444                 realmode_ctx.SegDs, realmode_ctx.SegEs );
 445         }
 446     }
 447     INT_SetRealModeContext( call, &realmode_ctx );
 448 }
 449
 450
 451 static void CallRMProc( CONTEXT86 *context, int iret )
 452 {
 453     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( context->SegEs, DI_reg(context) );
 454     CONTEXT86 context16;
 455
 456     TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 457         p->eax, p->ebx, p->ecx, p->edx);
 458     TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 459         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 460
 461     if (!(p->cs) && !(p->ip)) { /* remove this check
 462                                    if Int21/6501 case map function
 463                                    has been implemented */
 464         SET_CFLAG(context);
 465         return;
 466     }
 467     INT_GetRealModeContext(p, &context16);
 468     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(context->SegSs, LOWORD(context->Esp)))+3,
 469                      CX_reg(context), iret );
 470     INT_SetRealModeContext(p, &context16);
 471 }
 472
 473
 474 static RMCB *DPMI_AllocRMCB( void )
 475 {
 476     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 477     UINT16 uParagraph;
 478
 479     if (NewRMCB)
 480     {
 481         LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
 482         LPBYTE p = RMCBmem;
 483
 484         *p++ = 0xcd; /* RMCB: */
 485         *p++ = 0x31; /* int $0x31 */
 486 /* it is the called procedure's task to change the return CS:EIP
 487    the DPMI 0.9 spec states that if it doesn't, it will be called again */
 488         *p++ = 0xeb;
 489         *p++ = 0xfc; /* jmp RMCB */
 490         NewRMCB->address = MAKELONG(0, uParagraph);
 491         NewRMCB->next = FirstRMCB;
 492         FirstRMCB = NewRMCB;
 493     }
 494     return NewRMCB;
 495 }
 496
 497
 498 static void AllocRMCB( CONTEXT86 *context )
 499 {
 500     RMCB *NewRMCB = DPMI_AllocRMCB();
 501
 502     TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
 503
 504     if (NewRMCB)
 505     {
 506         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 507         NewRMCB->proc_ofs = LOWORD(context->Esi);
 508         NewRMCB->proc_sel = context->SegDs;
 509         NewRMCB->regs_ofs = LOWORD(context->Edi);
 510         NewRMCB->regs_sel = context->SegEs;
 511         SET_LOWORD( context->Ecx, HIWORD(NewRMCB->address) );
 512         SET_LOWORD( context->Edx, LOWORD(NewRMCB->address) );
 513     }
 514     else
 515     {
 516         SET_LOWORD( context->Eax, 0x8015 ); /* callback unavailable */
 517         SET_CFLAG(context);
 518     }
 519 }
 520
 521
 522 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 523 {
 524     RMCB *NewRMCB = DPMI_AllocRMCB();
 525
 526     if (NewRMCB) {
 527         NewRMCB->proc_ofs = (DWORD)proc;
 528         NewRMCB->proc_sel = 0;
 529         NewRMCB->regs_ofs = 0;
 530         NewRMCB->regs_sel = 0;
 531         return (FARPROC16)(NewRMCB->address);
 532     }
 533     return NULL;
 534 }
 535
 536
 537 static int DPMI_FreeRMCB( DWORD address )
 538 {
 539     RMCB *CurrRMCB = FirstRMCB;
 540     RMCB *PrevRMCB = NULL;
 541
 542     while (CurrRMCB && (CurrRMCB->address != address))
 543     {
 544         PrevRMCB = CurrRMCB;
 545         CurrRMCB = CurrRMCB->next;
 546     }
 547     if (CurrRMCB)
 548     {
 549         if (PrevRMCB)
 550         PrevRMCB->next = CurrRMCB->next;
 551             else
 552         FirstRMCB = CurrRMCB->next;
 553         DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(CurrRMCB->address));
 554         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 555         return 0;
 556     }
 557     return 1;
 558 }
 559
 560
 561 static void FreeRMCB( CONTEXT86 *context )
 562 {
 563     FIXME("callback address: %04x:%04x\n",
 564           CX_reg(context), DX_reg(context));
 565
 566     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 567         SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
 568         SET_CFLAG(context);
 569     }
 570 }
 571
 572
 573 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 574 {
 575     DPMI_FreeRMCB( (DWORD)proc );
 576 }
 577
 578
 579 /* (see dosmem.c, function DOSMEM_InitDPMI) */
 580
 581 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 582 {
 583     UINT16 cs, ss, ds, es;
 584     CONTEXT86 pm_ctx;
 585     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 586     PDB16 *psp = (PDB16 *)psp_ofs;
 587     HANDLE16 env_seg = psp->environment;
 588     unsigned char selflags = WINE_LDT_FLAGS_DATA;
 589
 590     RESET_CFLAG(context);
 591     lpDosTask->dpmi_flag = AX_reg(context);
 592 /* our mode switch wrapper have placed the desired CS into DX */
 593     cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE );
 594 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 595    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 596    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 597    32-bit code using this stack. */
 598     if (lpDosTask->dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
 599     ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags );
 600 /* do the same for the data segments, just in case */
 601     if (context->SegDs == context->SegSs) ds = ss;
 602     else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags );
 603     es = SELECTOR_AllocBlock( psp, 0x100, selflags );
 604 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 605     psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA );
 606
 607     pm_ctx = *context;
 608     pm_ctx.SegCs = DOSMEM_dpmi_sel;
 609 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 610     pm_ctx.Eax   = ss;
 611     pm_ctx.Edx   = cs;
 612     pm_ctx.SegDs = ds;
 613     pm_ctx.SegEs = es;
 614     pm_ctx.SegFs = 0;
 615     pm_ctx.SegGs = 0;
 616
 617     TRACE("DOS program is now entering protected mode\n");
 618     wine_call_to_16_regs_short(&pm_ctx, 0);
 619
 620     /* in the current state of affairs, we won't ever actually return here... */
 621     /* we should have int21/ah=4c do it someday, though... */
 622
 623     FreeSelector16(psp->environment);
 624     psp->environment = env_seg;
 625     FreeSelector16(es);
 626     if (ds != ss) FreeSelector16(ds);
 627     FreeSelector16(ss);
 628     FreeSelector16(cs);
 629 }
 630
 631 /* DPMI Raw Mode Switch handler */
 632
 633 #if 0
 634 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 635 {
 636   LPDOSTASK lpDosTask = MZ_Current();
 637   CONTEXT86 rm_ctx;
 638   int ret;
 639
 640   if (!lpDosTask) {
 641     /* we could probably start a DPMI-only dosmod task here, but I doubt
 642        anything other than real DOS apps want to call raw mode switch */
 643     ERR("attempting raw mode switch without DOS task!\n");
 644     ExitProcess(1);
 645   }
 646   /* initialize real-mode context as per spec */
 647   memset(&rm_ctx, 0, sizeof(rm_ctx));
 648   rm_ctx.SegDs  = AX_sig(context);
 649   rm_ctx.SegEs  = CX_sig(context);
 650   rm_ctx.SegSs  = DX_sig(context);
 651   rm_ctx.Esp    = EBX_sig(context);
 652   rm_ctx.SegCs  = SI_sig(context);
 653   rm_ctx.Eip    = EDI_sig(context);
 654   rm_ctx.Ebp    = EBP_sig(context);
 655   rm_ctx.SegFs  = 0;
 656   rm_ctx.SegGs  = 0;
 657   rm_ctx.EFlags = EFL_sig(context); /* at least we need the IF flag */
 658
 659   /* enter real mode again */
 660   TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
 661   ret = DOSVM_Enter( &rm_ctx );
 662   /* when the real-mode stuff call its mode switch address,
 663      DOSVM_Enter will return and we will continue here */
 664
 665   if (ret<0) {
 666     /* if the sync was lost, there's no way to recover */
 667     ExitProcess(1);
 668   }
 669
 670   /* alter protected-mode context as per spec */
 671   DS_sig(context)  = LOWORD(rm_ctx.Eax);
 672   ES_sig(context)  = LOWORD(rm_ctx.Ecx);
 673   SS_sig(context)  = LOWORD(rm_ctx.Edx);
 674   ESP_sig(context) = rm_ctx.Ebx;
 675   CS_sig(context)  = LOWORD(rm_ctx.Esi);
 676   EIP_sig(context) = rm_ctx.Edi;
 677   EBP_sig(context) = rm_ctx.Ebp;
 678   FS_sig(context) = 0;
 679   GS_sig(context) = 0;
 680
 681   /* Return to new address and hope that we didn't mess up */
 682   TRACE("re-entering protected mode at %04x:%08lx\n",
 683         CS_sig(context), EIP_sig(context));
 684 }
 685 #endif
 686
 687
 688 /**********************************************************************
 689  *          INT_Int31Handler
 690  *
 691  * Handler for int 31h (DPMI).
 692  */
 693
 694 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 695 {
 696     /*
 697      * Note: For Win32s processes, the whole linear address space is
 698      *       shifted by 0x10000 relative to the OS linear address space.
 699      *       See the comment in msdos/vxd.c.
 700      */
 701     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 702
 703     DWORD dw;
 704     BYTE *ptr;
 705
 706     LPDOSTASK lpDosTask = MZ_Current();
 707
 708     if (ISV86(context) && lpDosTask) {
 709         /* Called from real mode, check if it's our wrapper */
 710         TRACE("called from real mode\n");
 711         if (context->SegCs==DOSMEM_dpmi_seg) {
 712             /* This is the protected mode switch */
 713             StartPM(context,lpDosTask);
 714             return;
 715         } else
 716         if (context->SegCs==DOSMEM_xms_seg) {
 717             /* This is the XMS driver entry point */
 718             XMS_Handler(context);
 719             return;
 720         } else
 721         {
 722             /* Check for RMCB */
 723             RMCB *CurrRMCB = FirstRMCB;
 724
 725             while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
 726                 CurrRMCB = CurrRMCB->next;
 727
 728             if (CurrRMCB) {
 729                 /* RMCB call, propagate to protected-mode handler */
 730                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 731                 return;
 732             }
 733         }
 734     }
 735
 736     RESET_CFLAG(context);
 737     switch(AX_reg(context))
 738     {
 739     case 0x0000:  /* Allocate LDT descriptors */
 740         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 741         if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
 742         {
 743             TRACE("failed\n");
 744             context->Eax = 0x8011;  /* descriptor unavailable */
 745             SET_CFLAG(context);
 746         }
 747         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 748         break;
 749
 750     case 0x0001:  /* Free LDT descriptor */
 751         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 752         if (FreeSelector16( BX_reg(context) ))
 753         {
 754             context->Eax = 0x8022;  /* invalid selector */
 755             SET_CFLAG(context);
 756         }
 757         else
 758         {
 759             /* If a segment register contains the selector being freed, */
 760             /* set it to zero. */
 761             if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
 762             if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
 763             if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
 764             if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
 765         }
 766         break;
 767
 768     case 0x0002:  /* Real mode segment to descriptor */
 769         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 770         {
 771             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 772             switch(BX_reg(context))
 773             {
 774             case 0x0000: entryPoint = 183; break;  /* __0000H */
 775             case 0x0040: entryPoint = 193; break;  /* __0040H */
 776             case 0xa000: entryPoint = 174; break;  /* __A000H */
 777             case 0xb000: entryPoint = 181; break;  /* __B000H */
 778             case 0xb800: entryPoint = 182; break;  /* __B800H */
 779             case 0xc000: entryPoint = 195; break;  /* __C000H */
 780             case 0xd000: entryPoint = 179; break;  /* __D000H */
 781             case 0xe000: entryPoint = 190; break;  /* __E000H */
 782             case 0xf000: entryPoint = 194; break;  /* __F000H */
 783             default:
 784                 context->Eax = DOSMEM_AllocSelector(BX_reg(context));
 785                 break;
 786             }
 787             if (entryPoint)
 788                 context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
 789                                                         (LPCSTR)(ULONG_PTR)entryPoint ));
 790         }
 791         break;
 792
 793     case 0x0003:  /* Get next selector increment */
 794         TRACE("get selector increment (__AHINCR)\n");
 795         context->Eax = __AHINCR;
 796         break;
 797
 798     case 0x0004:  /* Lock selector (not supported) */
 799         FIXME("lock selector not supported\n");
 800         context->Eax = 0;  /* FIXME: is this a correct return value? */
 801         break;
 802
 803     case 0x0005:  /* Unlock selector (not supported) */
 804         FIXME("unlock selector not supported\n");
 805         context->Eax = 0;  /* FIXME: is this a correct return value? */
 806         break;
 807
 808     case 0x0006:  /* Get selector base address */
 809         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 810         if (!(dw = GetSelectorBase( BX_reg(context) )))
 811         {
 812             context->Eax = 0x8022;  /* invalid selector */
 813             SET_CFLAG(context);
 814         }
 815         else
 816         {
 817             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 818             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 819         }
 820         break;
 821
 822     case 0x0007:  /* Set selector base address */
 823         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 824                      BX_reg(context),
 825                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 826         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 827         if (dw < 0x10000)
 828             /* app wants to access lower 64K of DOS memory, map it in now */
 829             DOSMEM_Init(TRUE);
 830         SetSelectorBase(BX_reg(context), dw);
 831         break;
 832
 833     case 0x0008:  /* Set selector limit */
 834         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 835         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 836         SetSelectorLimit16( BX_reg(context), dw );
 837         break;
 838
 839     case 0x0009:  /* Set selector access rights */
 840         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 841         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 842         break;
 843
 844     case 0x000a:  /* Allocate selector alias */
 845         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 846         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 847         {
 848             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 849             SET_CFLAG(context);
 850         }
 851         break;
 852
 853     case 0x000b:  /* Get descriptor */
 854         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 855         {
 856             LDT_ENTRY entry;
 857             wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry), offset) );
 858             /* FIXME: should use ES:EDI for 32-bit clients */
 859             *(LDT_ENTRY *)PTR_SEG_OFF_TO_LIN( context->SegEs, LOWORD(context->Edi) ) = entry;
 860         }
 861         break;
 862
 863     case 0x000c:  /* Set descriptor */
 864         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 865         {
 866             LDT_ENTRY entry = *(LDT_ENTRY *)PTR_SEG_OFF_TO_LIN( context->SegEs,
 867                                                                 LOWORD(context->Edi) );
 868             wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry), offset) );
 869             wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
 870         }
 871         break;
 872
 873     case 0x000d:  /* Allocate specific LDT descriptor */
 874         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 875         AX_reg(context) = 0x8011; /* descriptor unavailable */
 876         SET_CFLAG(context);
 877         break;
 878     case 0x0100:  /* Allocate DOS memory block */
 879         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 880         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 881         if (dw) {
 882             AX_reg(context) = HIWORD(dw);
 883             DX_reg(context) = LOWORD(dw);
 884         } else {
 885             AX_reg(context) = 0x0008; /* insufficient memory */
 886             BX_reg(context) = DOSMEM_Available()>>4;
 887             SET_CFLAG(context);
 888         }
 889         break;
 890     case 0x0101:  /* Free DOS memory block */
 891         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 892         dw = GlobalDOSFree16(DX_reg(context));
 893         if (!dw) {
 894             AX_reg(context) = 0x0009; /* memory block address invalid */
 895             SET_CFLAG(context);
 896         }
 897         break;
 898     case 0x0200: /* get real mode interrupt vector */
 899         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 900               BL_reg(context));
 901         SET_CFLAG(context);
 902         break;
 903     case 0x0201: /* set real mode interrupt vector */
 904         FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 905         SET_CFLAG(context);
 906         break;
 907     case 0x0204:  /* Get protected mode interrupt vector */
 908         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 909         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 910         CX_reg(context) = HIWORD(dw);
 911         DX_reg(context) = LOWORD(dw);
 912         break;
 913
 914     case 0x0205:  /* Set protected mode interrupt vector */
 915         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
 916             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
 917         INT_SetPMHandler( BL_reg(context),
 918                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
 919                                                             DX_reg(context) ));
 920         break;
 921
 922     case 0x0300:  /* Simulate real mode interrupt */
 923         CallRMInt( context );
 924         break;
 925
 926     case 0x0301:  /* Call real mode procedure with far return */
 927         CallRMProc( context, FALSE );
 928         break;
 929
 930     case 0x0302:  /* Call real mode procedure with interrupt return */
 931         CallRMProc( context, TRUE );
 932         break;
 933
 934     case 0x0303:  /* Allocate Real Mode Callback Address */
 935         AllocRMCB( context );
 936         break;
 937
 938     case 0x0304:  /* Free Real Mode Callback Address */
 939         FreeRMCB( context );
 940         break;
 941
 942     case 0x0305:  /* Get State Save/Restore Addresses */
 943         TRACE("get state save/restore addresses\n");
 944         /* we probably won't need this kind of state saving */
 945         AX_reg(context) = 0;
 946         /* real mode: just point to the lret */
 947         BX_reg(context) = DOSMEM_wrap_seg;
 948         context->Ecx = 2;
 949         /* protected mode: don't have any handler yet... */
 950         FIXME("no protected-mode dummy state save/restore handler yet\n");
 951         SI_reg(context) = 0;
 952         context->Edi = 0;
 953         break;
 954
 955     case 0x0306:  /* Get Raw Mode Switch Addresses */
 956         TRACE("get raw mode switch addresses\n");
 957         /* real mode, point to standard DPMI return wrapper */
 958         BX_reg(context) = DOSMEM_wrap_seg;
 959         context->Ecx = 0;
 960         /* protected mode, point to DPMI call wrapper */
 961         SI_reg(context) = DOSMEM_dpmi_sel;
 962         context->Edi = 8; /* offset of the INT 0x31 call */
 963         break;
 964     case 0x0400:  /* Get DPMI version */
 965         TRACE("get DPMI version\n");
 966         {
 967             SYSTEM_INFO si;
 968
 969             GetSystemInfo(&si);
 970             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 971             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 972             CL_reg(context) = si.wProcessorLevel;
 973             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 974             break;
 975         }
 976     case 0x0500:  /* Get free memory information */
 977         TRACE("get free memory information\n");
 978         {
 979             MEMMANINFO mmi;
 980
 981             mmi.dwSize = sizeof(mmi);
 982             MemManInfo16(&mmi);
 983             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(context->SegEs,DI_reg(context));
 984             /* the layout is just the same as MEMMANINFO, but without
 985              * the dwSize entry.
 986              */
 987             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 988             break;
 989         }
 990     case 0x0501:  /* Allocate memory block */
 991         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 992         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
 993         {
 994             AX_reg(context) = 0x8012;  /* linear memory not available */
 995             SET_CFLAG(context);
 996         } else {
 997             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 998             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 999         }
1000         break;
1001
1002     case 0x0502:  /* Free memory block */
1003         TRACE("free memory block (0x%08lx)\n",
1004                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
1005         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
1006                                                SI_reg(context)), offset) );
1007         break;
1008
1009     case 0x0503:  /* Resize memory block */
1010         TRACE("resize memory block (0x%08lx,%ld)\n",
1011                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1012                      MAKELONG(CX_reg(context),BX_reg(context)));
1013         if (!(ptr = (BYTE *)DPMI_xrealloc(
1014                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1015                 MAKELONG(CX_reg(context),BX_reg(context)))))
1016         {
1017             AX_reg(context) = 0x8012;  /* linear memory not available */
1018             SET_CFLAG(context);
1019         } else {
1020             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1021             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1022         }
1023         break;
1024
1025     case 0x0507:  /* Modify page attributes */
1026         FIXME("modify page attributes unimplemented\n");
1027         break;  /* Just ignore it */
1028
1029     case 0x0600:  /* Lock linear region */
1030         FIXME("lock linear region unimplemented\n");
1031         break;  /* Just ignore it */
1032
1033     case 0x0601:  /* Unlock linear region */
1034         FIXME("unlock linear region unimplemented\n");
1035         break;  /* Just ignore it */
1036
1037     case 0x0602:  /* Unlock real-mode region */
1038         FIXME("unlock realmode region unimplemented\n");
1039         break;  /* Just ignore it */
1040
1041     case 0x0603:  /* Lock real-mode region */
1042         FIXME("lock realmode region unimplemented\n");
1043         break;  /* Just ignore it */
1044
1045     case 0x0604:  /* Get page size */
1046         TRACE("get pagesize\n");
1047         BX_reg(context) = 0;
1048         CX_reg(context) = VIRTUAL_GetPageSize();
1049         break;
1050
1051     case 0x0702:  /* Mark page as demand-paging candidate */
1052         FIXME("mark page as demand-paging candidate\n");
1053         break;  /* Just ignore it */
1054
1055     case 0x0703:  /* Discard page contents */
1056         FIXME("discard page contents\n");
1057         break;  /* Just ignore it */
1058
1059      case 0x0800:  /* Physical address mapping */
1060         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1061          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1062          {
1063              AX_reg(context) = 0x8021;
1064              SET_CFLAG(context);
1065          }
1066          else
1067          {
1068              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1069              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1070              RESET_CFLAG(context);
1071          }
1072          break;
1073
1074     default:
1075         INT_BARF( context, 0x31 );
1076         AX_reg(context) = 0x8001;  /* unsupported function */
1077         SET_CFLAG(context);
1078         break;
1079     }
1080
1081 }