dlls/winedos/module.c

   1 /*
   2  * DOS (MZ) loader
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Note: This code hasn't been completely cleaned up yet.
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #ifdef HAVE_UNISTD_H
  33 # include <unistd.h>
  34 #endif
  35 #include <sys/types.h>
  36 #ifdef HAVE_SYS_STAT_H
  37 # include <sys/stat.h>
  38 #endif
  39 #ifdef HAVE_SYS_TIME_H
  40 # include <sys/time.h>
  41 #endif
  42 #include "windef.h"
  43 #include "winbase.h"
  44 #include "wine/winbase16.h"
  45 #include "wingdi.h"
  46 #include "winuser.h"
  47 #include "winerror.h"
  48 #include "wine/debug.h"
  49 #include "dosexe.h"
  50 #include "dosvm.h"
  51 #include "vga.h"
  52
  53 WINE_DEFAULT_DEBUG_CHANNEL(module);
  54
  55 static BOOL DOSVM_isdosexe;
  56
  57 /**********************************************************************
  58  *          DOSVM_IsWin16
  59  *
  60  * Return TRUE if we are in Windows process.
  61  */
  62 BOOL DOSVM_IsWin16(void)
  63 {
  64   return DOSVM_isdosexe ? FALSE : TRUE;
  65 }
  66
  67 #ifdef MZ_SUPPORTED
  68
  69 #ifdef HAVE_SYS_MMAN_H
  70 # include <sys/mman.h>
  71 #endif
  72
  73 /* define this to try mapping through /proc/pid/mem instead of a temp file,
  74    but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
  75 #undef MZ_MAPSELF
  76
  77 #define BIOS_DATA_SEGMENT 0x40
  78 #define PSP_SIZE 0x10
  79
  80 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
  81 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
  82
  83 /* structures for EXEC */
  84
  85 #include "pshpack1.h"
  86
  87 typedef struct {
  88   WORD env_seg;
  89   DWORD cmdline;
  90   DWORD fcb1;
  91   DWORD fcb2;
  92   WORD init_sp;
  93   WORD init_ss;
  94   WORD init_ip;
  95   WORD init_cs;
  96 } ExecBlock;
  97
  98 typedef struct {
  99   WORD load_seg;
 100   WORD rel_seg;
 101 } OverlayBlock;
 102
 103 #include "poppack.h"
 104
 105 /* global variables */
 106
 107 pid_t dosvm_pid;
 108
 109 static WORD init_cs,init_ip,init_ss,init_sp;
 110 static HANDLE dosvm_thread, loop_thread;
 111 static DWORD dosvm_tid, loop_tid;
 112
 113 static void MZ_Launch( LPCSTR cmdtail, int length );
 114 static BOOL MZ_InitTask(void);
 115
 116 static void MZ_CreatePSP( LPVOID lpPSP, WORD env, WORD par )
 117 {
 118   PDB16*psp=lpPSP;
 119
 120   psp->int20=0x20CD; /* int 20 */
 121   /* some programs use this to calculate how much memory they need */
 122   psp->nextParagraph=0x9FFF; /* FIXME: use a real value */
 123   /* FIXME: dispatcher */
 124   psp->savedint22 = DOSVM_GetRMHandler(0x22);
 125   psp->savedint23 = DOSVM_GetRMHandler(0x23);
 126   psp->savedint24 = DOSVM_GetRMHandler(0x24);
 127   psp->parentPSP=par;
 128   psp->environment=env;
 129   /* FIXME: more PSP stuff */
 130 }
 131
 132 static void MZ_FillPSP( LPVOID lpPSP, LPCSTR cmdtail, int length )
 133 {
 134     PDB16 *psp = lpPSP;
 135
 136     if(length > 127)
 137     {
 138         WARN( "Command tail truncated! (length %d)\n", length );
 139         length = 126;
 140     }
 141
 142     psp->cmdLine[0] = length;
 143
 144     /*
 145      * Length of exactly 127 bytes means that full command line is
 146      * stored in environment variable CMDLINE and PSP contains
 147      * command tail truncated to 126 bytes.
 148      */
 149     if(length == 127)
 150         length = 126;
 151
 152     if(length > 0)
 153         memmove(psp->cmdLine+1, cmdtail, length);
 154
 155     psp->cmdLine[length+1] = '\r';
 156
 157     /* FIXME: more PSP stuff */
 158 }
 159
 160 static WORD MZ_InitEnvironment( LPCSTR env, LPCSTR name )
 161 {
 162  unsigned sz=0;
 163  unsigned i=0;
 164  WORD seg;
 165  LPSTR envblk;
 166
 167  if (env) {
 168   /* get size of environment block */
 169   while (env[sz++]) sz+=strlen(env+sz)+1;
 170  } else sz++;
 171  /* allocate it */
 172  envblk=DOSMEM_AllocBlock(sz+sizeof(WORD)+strlen(name)+1,&seg);
 173  /* fill it */
 174  if (env) {
 175   memcpy(envblk,env,sz);
 176  } else envblk[0]=0;
 177  /* DOS environment variables are uppercase */
 178  while (envblk[i]){
 179   while (envblk[i] != '='){
 180    if (envblk[i]>='a' && envblk[i] <= 'z'){
 181     envblk[i] -= 32;
 182    }
 183    i++;
 184   }
 185   i += strlen(envblk+i) + 1;
 186  }
 187  /* DOS 3.x: the block contains 1 additional string */
 188  *(WORD*)(envblk+sz)=1;
 189  /* being the program name itself */
 190  strcpy(envblk+sz+sizeof(WORD),name);
 191  return seg;
 192 }
 193
 194 static BOOL MZ_InitMemory(void)
 195 {
 196     /* initialize the memory */
 197     TRACE("Initializing DOS memory structures\n");
 198     DOSMEM_MapDosLayout();
 199     DOSDEV_InstallDOSDevices();
 200
 201     return TRUE;
 202 }
 203
 204 static BOOL MZ_DoLoadImage( HANDLE hFile, LPCSTR filename, OverlayBlock *oblk, WORD par_env_seg )
 205 {
 206   IMAGE_DOS_HEADER mz_header;
 207   DWORD image_start,image_size,min_size,max_size,avail;
 208   BYTE*psp_start,*load_start,*oldenv = 0;
 209   int x, old_com=0, alloc;
 210   SEGPTR reloc;
 211   WORD env_seg, load_seg, rel_seg, oldpsp_seg;
 212   DWORD len;
 213
 214   if (DOSVM_psp) {
 215     /* DOS process already running, inherit from it */
 216     PDB16* par_psp;
 217     alloc=0;
 218     oldpsp_seg = DOSVM_psp;
 219     if( !par_env_seg) {
 220         par_psp = (PDB16*)((DWORD)DOSVM_psp << 4);
 221         oldenv = (LPBYTE)((DWORD)par_psp->environment << 4);
 222     }
 223   } else {
 224     /* allocate new DOS process, inheriting from Wine environment */
 225     alloc=1;
 226     oldpsp_seg = 0;
 227     if( !par_env_seg)
 228         oldenv = GetEnvironmentStringsA();
 229   }
 230
 231  SetFilePointer(hFile,0,NULL,FILE_BEGIN);
 232  if (   !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
 233      || len != sizeof(mz_header)
 234      || mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
 235   char *p = strrchr( filename, '.' );
 236   if (!p || strcasecmp( p, ".com" ))  /* check for .COM extension */
 237   {
 238       SetLastError(ERROR_BAD_FORMAT);
 239       goto load_error;
 240   }
 241   old_com=1; /* assume .COM file */
 242   image_start=0;
 243   image_size=GetFileSize(hFile,NULL);
 244   min_size=0x10000; max_size=0x100000;
 245   mz_header.e_crlc=0;
 246   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 247   mz_header.e_cs=0; mz_header.e_ip=0x100;
 248  } else {
 249   /* calculate load size */
 250   image_start=mz_header.e_cparhdr<<4;
 251   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 252   /* From Ralf Brown Interrupt List: If the word at offset 02h is 4, it should
 253    * be treated as 00h, since pre-1.10 versions of the MS linker set it that
 254    * way. */
 255   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 256   image_size-=image_start;
 257   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 258   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 259  }
 260
 261   if (alloc) MZ_InitMemory();
 262
 263   if (oblk) {
 264     /* load overlay into preallocated memory */
 265     load_seg=oblk->load_seg;
 266     rel_seg=oblk->rel_seg;
 267     load_start=(LPBYTE)((DWORD)load_seg<<4);
 268   } else {
 269     /* allocate environment block */
 270     if( par_env_seg)
 271         env_seg = par_env_seg;
 272     else
 273         env_seg=MZ_InitEnvironment(oldenv, filename);
 274     if( alloc && oldenv)
 275         FreeEnvironmentStringsA( oldenv);
 276
 277     /* allocate memory for the executable */
 278     TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 279     avail=DOSMEM_Available();
 280     if (avail<min_size) {
 281       ERR("insufficient DOS memory\n");
 282       SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 283       goto load_error;
 284     }
 285     if (avail>max_size) avail=max_size;
 286     psp_start=DOSMEM_AllocBlock(avail,&DOSVM_psp);
 287     if (!psp_start) {
 288       ERR("error allocating DOS memory\n");
 289       SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 290       goto load_error;
 291     }
 292     load_seg=DOSVM_psp+(old_com?0:PSP_SIZE);
 293     rel_seg=load_seg;
 294     load_start=psp_start+(PSP_SIZE<<4);
 295     MZ_CreatePSP(psp_start, env_seg, oldpsp_seg);
 296   }
 297
 298  /* load executable image */
 299  TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 300  SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
 301  if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
 302   /* check if this is due to the workaround for the pre-1.10 MS linker and we
 303      realy had only 4 bytes on the last page */
 304   if (mz_header.e_cblp != 4 || image_size - len != 512 - 4) {
 305     SetLastError(ERROR_BAD_FORMAT);
 306     goto load_error;
 307   }
 308  }
 309
 310  if (mz_header.e_crlc) {
 311   /* load relocation table */
 312   TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
 313   /* FIXME: is this too slow without read buffering? */
 314   SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
 315   for (x=0; x<mz_header.e_crlc; x++) {
 316    if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
 317     SetLastError(ERROR_BAD_FORMAT);
 318     goto load_error;
 319    }
 320    *(WORD*)SEGPTR16(load_start,reloc)+=rel_seg;
 321   }
 322  }
 323
 324   if (!oblk) {
 325     init_cs = load_seg+mz_header.e_cs;
 326     init_ip = mz_header.e_ip;
 327     init_ss = load_seg+mz_header.e_ss;
 328     init_sp = mz_header.e_sp;
 329     if (old_com){
 330       /* .COM files exit with ret. Make sure they jump to psp start (=int 20) */
 331       WORD* stack = PTR_REAL_TO_LIN(init_ss, init_sp);
 332       *stack = 0;
 333     }
 334
 335     TRACE("entry point: %04x:%04x\n",init_cs,init_ip);
 336   }
 337
 338   if (alloc && !MZ_InitTask()) {
 339     SetLastError(ERROR_GEN_FAILURE);
 340     return FALSE;
 341   }
 342
 343   return TRUE;
 344
 345 load_error:
 346   DOSVM_psp = oldpsp_seg;
 347
 348   return FALSE;
 349 }
 350
 351 /***********************************************************************
 352  *              wine_load_dos_exe (WINEDOS.@)
 353  *
 354  * Called from WineVDM when a new real-mode DOS process is started.
 355  * Loads DOS program into memory and executes the program.
 356  */
 357 void WINAPI wine_load_dos_exe( LPCSTR filename, LPCSTR cmdline )
 358 {
 359     char dos_cmdtail[126];
 360     int  dos_length = 0;
 361
 362     HANDLE hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
 363                                 NULL, OPEN_EXISTING, 0, 0 );
 364     if (hFile == INVALID_HANDLE_VALUE) return;
 365     DOSVM_isdosexe = TRUE;
 366
 367     if(cmdline && *cmdline)
 368     {
 369         dos_length = strlen(cmdline);
 370         memmove( dos_cmdtail + 1, cmdline,
 371                  (dos_length < 125) ? dos_length : 125 );
 372
 373         /* Non-empty command tail always starts with at least one space. */
 374         dos_cmdtail[0] = ' ';
 375         dos_length++;
 376
 377         /*
 378          * If command tail is longer than 126 characters,
 379          * set tail length to 127 and fill CMDLINE environment variable
 380          * with full command line (this includes filename).
 381          */
 382         if (dos_length > 126)
 383         {
 384             char *cmd = HeapAlloc( GetProcessHeap(), 0,
 385                                    dos_length + strlen(filename) + 4 );
 386             char *ptr = cmd;
 387
 388             if (!cmd)
 389                 return;
 390
 391             /*
 392              * Append filename. If path includes spaces, quote the path.
 393              */
 394             if (strchr(filename, ' '))
 395             {
 396                 *ptr++ = '\"';
 397                 strcpy( ptr, filename );
 398                 ptr += strlen(filename);
 399                 *ptr++ = '\"';
 400             }
 401             else
 402             {
 403                 strcpy( ptr, filename );
 404                 ptr += strlen(filename);
 405             }
 406
 407             /*
 408              * Append command tail.
 409              */
 410             if (cmdline[0] != ' ')
 411                 *ptr++ = ' ';
 412             strcpy( ptr, cmdline );
 413
 414             /*
 415              * Set environment variable. This will be passed to
 416              * new DOS process.
 417              */
 418             if (!SetEnvironmentVariableA( "CMDLINE", cmd ))
 419             {
 420                 HeapFree(GetProcessHeap(), 0, cmd );
 421                 return;
 422             }
 423
 424             HeapFree(GetProcessHeap(), 0, cmd );
 425             dos_length = 127;
 426         }
 427     }
 428
 429     if (MZ_DoLoadImage( hFile, filename, NULL, 0 ))
 430         MZ_Launch( dos_cmdtail, dos_length );
 431 }
 432
 433 /***********************************************************************
 434  *              MZ_Exec
 435  *
 436  * this may only be called from existing DOS processes
 437  */
 438 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
 439 {
 440   DWORD binType;
 441   STARTUPINFOA st;
 442   PROCESS_INFORMATION pe;
 443   HANDLE hFile;
 444
 445   BOOL ret = FALSE;
 446
 447   if(!GetBinaryTypeA(filename, &binType))   /* determine what kind of binary this is */
 448   {
 449     return FALSE; /* binary is not an executable */
 450   }
 451
 452   /* handle non-dos executables */
 453   if(binType != SCS_DOS_BINARY)
 454   {
 455     if(func == 0) /* load and execute */
 456     {
 457       LPBYTE fullCmdLine;
 458       WORD fullCmdLength;
 459       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 460       PDB16 *psp = (PDB16 *)psp_start;
 461       ExecBlock *blk = (ExecBlock *)paramblk;
 462       LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
 463       LPBYTE envblock = PTR_REAL_TO_LIN(psp->environment, 0);
 464       int    cmdLength = cmdline[0];
 465
 466       /*
 467        * If cmdLength is 127, command tail is truncated and environment
 468        * variable CMDLINE should contain full command line
 469        * (this includes filename).
 470        */
 471       if (cmdLength == 127)
 472       {
 473           FIXME( "CMDLINE argument passing is unimplemented.\n" );
 474           cmdLength = 126; /* FIXME */
 475       }
 476
 477       fullCmdLength = (strlen(filename) + 1) + cmdLength + 1; /* filename + space + cmdline + terminating null character */
 478
 479       fullCmdLine = HeapAlloc(GetProcessHeap(), 0, fullCmdLength);
 480       if(!fullCmdLine) return FALSE; /* return false on memory alloc failure */
 481
 482       /* build the full command line from the executable file and the command line being passed in */
 483       snprintf(fullCmdLine, fullCmdLength, "%s ", filename); /* start off with the executable filename and a space */
 484       memcpy(fullCmdLine + strlen(fullCmdLine), cmdline + 1, cmdLength); /* append cmdline onto the end */
 485       fullCmdLine[fullCmdLength - 1] = 0; /* null terminate string */
 486
 487       ZeroMemory (&st, sizeof(STARTUPINFOA));
 488       st.cb = sizeof(STARTUPINFOA);
 489       ret = CreateProcessA (NULL, fullCmdLine, NULL, NULL, TRUE, 0, envblock, NULL, &st, &pe);
 490
 491       /* wait for the app to finish and clean up PROCESS_INFORMATION handles */
 492       if(ret)
 493       {
 494         WaitForSingleObject(pe.hProcess, INFINITE);  /* wait here until the child process is complete */
 495         CloseHandle(pe.hProcess);
 496         CloseHandle(pe.hThread);
 497       }
 498
 499       HeapFree(GetProcessHeap(), 0, fullCmdLine);  /* free the memory we allocated */
 500     }
 501     else
 502     {
 503       FIXME("EXEC type of %d not implemented for non-dos executables\n", func);
 504       ret = FALSE;
 505     }
 506
 507     return ret;
 508   } /* if(binType != SCS_DOS_BINARY) */
 509
 510
 511   /* handle dos executables */
 512
 513   hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
 514                              NULL, OPEN_EXISTING, 0, 0);
 515   if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 516
 517   switch (func) {
 518   case 0: /* load and execute */
 519   case 1: /* load but don't execute */
 520     {
 521       /* save current process's return SS:SP now */
 522       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 523       PDB16 *psp = (PDB16 *)psp_start;
 524       psp->saveStack = (DWORD)MAKESEGPTR(context->SegSs, LOWORD(context->Esp));
 525     }
 526     ret = MZ_DoLoadImage( hFile, filename, NULL, ((ExecBlock *)paramblk)->env_seg );
 527     if (ret) {
 528       /* MZ_LoadImage created a new PSP and loaded new values into it,
 529        * let's work on the new values now */
 530       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 531       ExecBlock *blk = (ExecBlock *)paramblk;
 532       LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
 533
 534       /* First character contains the length of the command line. */
 535       MZ_FillPSP(psp_start, cmdline + 1, cmdline[0]);
 536
 537       /* the lame MS-DOS engineers decided that the return address should be in int22 */
 538       DOSVM_SetRMHandler(0x22, (FARPROC16)MAKESEGPTR(context->SegCs, LOWORD(context->Eip)));
 539       if (func) {
 540         /* don't execute, just return startup state */
 541         /*
 542          * From Ralph Brown:
 543          *  For function 01h, the AX value to be passed to the child program
 544          *  is put on top of the child's stack
 545          */
 546         LPBYTE stack;
 547         init_sp -= 2;
 548         stack = (LPBYTE) CTX_SEG_OFF_TO_LIN(context, init_ss, init_sp);
 549         /* FIXME: push AX correctly */
 550         stack[0] = 0x00;    /* push AL */
 551         stack[1] = 0x00;    /* push AH */
 552
 553         blk->init_cs = init_cs;
 554         blk->init_ip = init_ip;
 555         blk->init_ss = init_ss;
 556         blk->init_sp = init_sp;
 557       } else {
 558         /* execute by making us return to new process */
 559         context->SegCs = init_cs;
 560         context->Eip   = init_ip;
 561         context->SegSs = init_ss;
 562         context->Esp   = init_sp;
 563         context->SegDs = DOSVM_psp;
 564         context->SegEs = DOSVM_psp;
 565         context->Eax   = 0;
 566       }
 567     }
 568     break;
 569   case 3: /* load overlay */
 570     {
 571       OverlayBlock *blk = (OverlayBlock *)paramblk;
 572       ret = MZ_DoLoadImage( hFile, filename, blk, 0);
 573     }
 574     break;
 575   default:
 576     FIXME("EXEC load type %d not implemented\n", func);
 577     SetLastError(ERROR_INVALID_FUNCTION);
 578     break;
 579   }
 580   CloseHandle(hFile);
 581   return ret;
 582 }
 583
 584 /***********************************************************************
 585  *              MZ_AllocDPMITask
 586  */
 587 void WINAPI MZ_AllocDPMITask( void )
 588 {
 589   MZ_InitMemory();
 590   MZ_InitTask();
 591 }
 592
 593 /***********************************************************************
 594  *              MZ_RunInThread
 595  */
 596 void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
 597 {
 598   if (loop_thread) {
 599     DOS_SPC spc;
 600     HANDLE event;
 601
 602     spc.proc = proc;
 603     spc.arg = arg;
 604     event = CreateEventW(NULL, TRUE, FALSE, NULL);
 605     PostThreadMessageA(loop_tid, WM_USER, (WPARAM)event, (LPARAM)&spc);
 606     WaitForSingleObject(event, INFINITE);
 607     CloseHandle(event);
 608   } else
 609     proc(arg);
 610 }
 611
 612 static DWORD WINAPI MZ_DOSVM( LPVOID lpExtra )
 613 {
 614   CONTEXT context;
 615   DWORD ret;
 616
 617   dosvm_pid = getpid();
 618
 619   memset( &context, 0, sizeof(context) );
 620   context.SegCs  = init_cs;
 621   context.Eip    = init_ip;
 622   context.SegSs  = init_ss;
 623   context.Esp    = init_sp;
 624   context.SegDs  = DOSVM_psp;
 625   context.SegEs  = DOSVM_psp;
 626   context.EFlags = V86_FLAG | VIF_MASK;
 627   DOSVM_SetTimer(0x10000);
 628   ret = DOSVM_Enter( &context );
 629
 630   dosvm_pid = 0;
 631   return ret;
 632 }
 633
 634 static BOOL MZ_InitTask(void)
 635 {
 636   if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
 637                        GetCurrentProcess(), &loop_thread,
 638                        0, FALSE, DUPLICATE_SAME_ACCESS))
 639     return FALSE;
 640   dosvm_thread = CreateThread(NULL, 0, MZ_DOSVM, NULL, CREATE_SUSPENDED, &dosvm_tid);
 641   if (!dosvm_thread) {
 642     CloseHandle(loop_thread);
 643     loop_thread = 0;
 644     return FALSE;
 645   }
 646   loop_tid = GetCurrentThreadId();
 647   return TRUE;
 648 }
 649
 650 static void MZ_Launch( LPCSTR cmdtail, int length )
 651 {
 652   TDB *pTask = GlobalLock16( GetCurrentTask() );
 653   BYTE *psp_start = PTR_REAL_TO_LIN( DOSVM_psp, 0 );
 654   DWORD rv;
 655   SYSLEVEL *lock;
 656
 657   MZ_FillPSP(psp_start, cmdtail, length);
 658   pTask->flags |= TDBF_WINOLDAP;
 659
 660   /* DTA is set to PSP:0080h when a program is started. */
 661   pTask->dta = MAKESEGPTR( DOSVM_psp, 0x80 );
 662
 663   GetpWin16Lock( &lock );
 664   _LeaveSysLevel( lock );
 665
 666   ResumeThread(dosvm_thread);
 667   rv = DOSVM_Loop(dosvm_thread);
 668
 669   CloseHandle(dosvm_thread);
 670   dosvm_thread = 0; dosvm_tid = 0;
 671   CloseHandle(loop_thread);
 672   loop_thread = 0; loop_tid = 0;
 673
 674   VGA_Clean();
 675   ExitProcess(rv);
 676 }
 677
 678 /***********************************************************************
 679  *              MZ_Exit
 680  */
 681 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
 682 {
 683   if (DOSVM_psp) {
 684     WORD psp_seg = cs_psp ? context->SegCs : DOSVM_psp;
 685     LPBYTE psp_start = (LPBYTE)((DWORD)psp_seg << 4);
 686     PDB16 *psp = (PDB16 *)psp_start;
 687     WORD parpsp = psp->parentPSP; /* check for parent DOS process */
 688     if (parpsp) {
 689       /* retrieve parent's return address */
 690       FARPROC16 retaddr = DOSVM_GetRMHandler(0x22);
 691       /* restore interrupts */
 692       DOSVM_SetRMHandler(0x22, psp->savedint22);
 693       DOSVM_SetRMHandler(0x23, psp->savedint23);
 694       DOSVM_SetRMHandler(0x24, psp->savedint24);
 695       /* FIXME: deallocate file handles etc */
 696       /* free process's associated memory
 697        * FIXME: walk memory and deallocate all blocks owned by process */
 698       DOSMEM_FreeBlock( PTR_REAL_TO_LIN(psp->environment,0) );
 699       DOSMEM_FreeBlock( PTR_REAL_TO_LIN(DOSVM_psp,0) );
 700       /* switch to parent's PSP */
 701       DOSVM_psp = parpsp;
 702       psp_start = (LPBYTE)((DWORD)parpsp << 4);
 703       psp = (PDB16 *)psp_start;
 704       /* now return to parent */
 705       DOSVM_retval = retval;
 706       context->SegCs = SELECTOROF(retaddr);
 707       context->Eip   = OFFSETOF(retaddr);
 708       context->SegSs = SELECTOROF(psp->saveStack);
 709       context->Esp   = OFFSETOF(psp->saveStack);
 710       return;
 711     } else
 712       TRACE("killing DOS task\n");
 713   }
 714   ExitThread( retval );
 715 }
 716
 717
 718 /***********************************************************************
 719  *              MZ_Current
 720  */
 721 BOOL WINAPI MZ_Current( void )
 722 {
 723   return (dosvm_pid != 0); /* FIXME: do a better check */
 724 }
 725
 726 #else /* !MZ_SUPPORTED */
 727
 728 /***********************************************************************
 729  *              wine_load_dos_exe (WINEDOS.@)
 730  */
 731 void WINAPI wine_load_dos_exe( LPCSTR filename, LPCSTR cmdline )
 732 {
 733   WARN("DOS executables not supported on this platform\n");
 734   SetLastError(ERROR_BAD_FORMAT);
 735 }
 736
 737 /***********************************************************************
 738  *              MZ_Exec
 739  */
 740 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
 741 {
 742   /* can't happen */
 743   SetLastError(ERROR_BAD_FORMAT);
 744   return FALSE;
 745 }
 746
 747 /***********************************************************************
 748  *              MZ_AllocDPMITask
 749  */
 750 void WINAPI MZ_AllocDPMITask( void )
 751 {
 752     ERR("Actual real-mode calls not supported on this platform!\n");
 753 }
 754
 755 /***********************************************************************
 756  *              MZ_RunInThread
 757  */
 758 void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
 759 {
 760     proc(arg);
 761 }
 762
 763 /***********************************************************************
 764  *              MZ_Exit
 765  */
 766 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
 767 {
 768   ExitThread( retval );
 769 }
 770
 771 /***********************************************************************
 772  *              MZ_Current
 773  */
 774 BOOL WINAPI MZ_Current( void )
 775 {
 776     return FALSE;
 777 }
 778
 779 #endif /* !MZ_SUPPORTED */