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;
 209   LPSTR oldenv = 0;
 210   int x, old_com=0, alloc;
 211   SEGPTR reloc;
 212   WORD env_seg, load_seg, rel_seg, oldpsp_seg;
 213   DWORD len;
 214
 215   if (DOSVM_psp) {
 216     /* DOS process already running, inherit from it */
 217     PDB16* par_psp;
 218     alloc=0;
 219     oldpsp_seg = DOSVM_psp;
 220     if( !par_env_seg) {
 221         par_psp = (PDB16*)((DWORD)DOSVM_psp << 4);
 222         oldenv = (LPSTR)((DWORD)par_psp->environment << 4);
 223     }
 224   } else {
 225     /* allocate new DOS process, inheriting from Wine environment */
 226     alloc=1;
 227     oldpsp_seg = 0;
 228     if( !par_env_seg)
 229         oldenv = GetEnvironmentStringsA();
 230   }
 231
 232  SetFilePointer(hFile,0,NULL,FILE_BEGIN);
 233  if (   !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
 234      || len != sizeof(mz_header)
 235      || mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
 236   char *p = strrchr( filename, '.' );
 237   if (!p || strcasecmp( p, ".com" ))  /* check for .COM extension */
 238   {
 239       SetLastError(ERROR_BAD_FORMAT);
 240       goto load_error;
 241   }
 242   old_com=1; /* assume .COM file */
 243   image_start=0;
 244   image_size=GetFileSize(hFile,NULL);
 245   min_size=0x10000; max_size=0x100000;
 246   mz_header.e_crlc=0;
 247   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 248   mz_header.e_cs=0; mz_header.e_ip=0x100;
 249  } else {
 250   /* calculate load size */
 251   image_start=mz_header.e_cparhdr<<4;
 252   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 253   /* From Ralf Brown Interrupt List: If the word at offset 02h is 4, it should
 254    * be treated as 00h, since pre-1.10 versions of the MS linker set it that
 255    * way. */
 256   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 257   image_size-=image_start;
 258   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 259   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 260  }
 261
 262   if (alloc) MZ_InitMemory();
 263
 264   if (oblk) {
 265     /* load overlay into preallocated memory */
 266     load_seg=oblk->load_seg;
 267     rel_seg=oblk->rel_seg;
 268     load_start=(LPBYTE)((DWORD)load_seg<<4);
 269   } else {
 270     /* allocate environment block */
 271     if( par_env_seg)
 272         env_seg = par_env_seg;
 273     else
 274         env_seg=MZ_InitEnvironment(oldenv, filename);
 275     if( alloc && oldenv)
 276         FreeEnvironmentStringsA( oldenv);
 277
 278     /* allocate memory for the executable */
 279     TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 280     avail=DOSMEM_Available();
 281     if (avail<min_size) {
 282       ERR("insufficient DOS memory\n");
 283       SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 284       goto load_error;
 285     }
 286     if (avail>max_size) avail=max_size;
 287     psp_start=DOSMEM_AllocBlock(avail,&DOSVM_psp);
 288     if (!psp_start) {
 289       ERR("error allocating DOS memory\n");
 290       SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 291       goto load_error;
 292     }
 293     load_seg=DOSVM_psp+(old_com?0:PSP_SIZE);
 294     rel_seg=load_seg;
 295     load_start=psp_start+(PSP_SIZE<<4);
 296     MZ_CreatePSP(psp_start, env_seg, oldpsp_seg);
 297   }
 298
 299  /* load executable image */
 300  TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 301  SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
 302  if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
 303   /* check if this is due to the workaround for the pre-1.10 MS linker and we
 304      realy had only 4 bytes on the last page */
 305   if (mz_header.e_cblp != 4 || image_size - len != 512 - 4) {
 306     SetLastError(ERROR_BAD_FORMAT);
 307     goto load_error;
 308   }
 309  }
 310
 311  if (mz_header.e_crlc) {
 312   /* load relocation table */
 313   TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
 314   /* FIXME: is this too slow without read buffering? */
 315   SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
 316   for (x=0; x<mz_header.e_crlc; x++) {
 317    if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
 318     SetLastError(ERROR_BAD_FORMAT);
 319     goto load_error;
 320    }
 321    *(WORD*)SEGPTR16(load_start,reloc)+=rel_seg;
 322   }
 323  }
 324
 325   if (!oblk) {
 326     init_cs = load_seg+mz_header.e_cs;
 327     init_ip = mz_header.e_ip;
 328     init_ss = load_seg+mz_header.e_ss;
 329     init_sp = mz_header.e_sp;
 330     if (old_com){
 331       /* .COM files exit with ret. Make sure they jump to psp start (=int 20) */
 332       WORD* stack = PTR_REAL_TO_LIN(init_ss, init_sp);
 333       *stack = 0;
 334     }
 335
 336     TRACE("entry point: %04x:%04x\n",init_cs,init_ip);
 337   }
 338
 339   if (alloc && !MZ_InitTask()) {
 340     SetLastError(ERROR_GEN_FAILURE);
 341     return FALSE;
 342   }
 343
 344   return TRUE;
 345
 346 load_error:
 347   DOSVM_psp = oldpsp_seg;
 348
 349   return FALSE;
 350 }
 351
 352 /***********************************************************************
 353  *              wine_load_dos_exe (WINEDOS.@)
 354  *
 355  * Called from WineVDM when a new real-mode DOS process is started.
 356  * Loads DOS program into memory and executes the program.
 357  */
 358 void WINAPI wine_load_dos_exe( LPCSTR filename, LPCSTR cmdline )
 359 {
 360     char dos_cmdtail[126];
 361     int  dos_length = 0;
 362
 363     HANDLE hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
 364                                 NULL, OPEN_EXISTING, 0, 0 );
 365     if (hFile == INVALID_HANDLE_VALUE) return;
 366     DOSVM_isdosexe = TRUE;
 367
 368     if(cmdline && *cmdline)
 369     {
 370         dos_length = strlen(cmdline);
 371         memmove( dos_cmdtail + 1, cmdline,
 372                  (dos_length < 125) ? dos_length : 125 );
 373
 374         /* Non-empty command tail always starts with at least one space. */
 375         dos_cmdtail[0] = ' ';
 376         dos_length++;
 377
 378         /*
 379          * If command tail is longer than 126 characters,
 380          * set tail length to 127 and fill CMDLINE environment variable
 381          * with full command line (this includes filename).
 382          */
 383         if (dos_length > 126)
 384         {
 385             char *cmd = HeapAlloc( GetProcessHeap(), 0,
 386                                    dos_length + strlen(filename) + 4 );
 387             char *ptr = cmd;
 388
 389             if (!cmd)
 390                 return;
 391
 392             /*
 393              * Append filename. If path includes spaces, quote the path.
 394              */
 395             if (strchr(filename, ' '))
 396             {
 397                 *ptr++ = '\"';
 398                 strcpy( ptr, filename );
 399                 ptr += strlen(filename);
 400                 *ptr++ = '\"';
 401             }
 402             else
 403             {
 404                 strcpy( ptr, filename );
 405                 ptr += strlen(filename);
 406             }
 407
 408             /*
 409              * Append command tail.
 410              */
 411             if (cmdline[0] != ' ')
 412                 *ptr++ = ' ';
 413             strcpy( ptr, cmdline );
 414
 415             /*
 416              * Set environment variable. This will be passed to
 417              * new DOS process.
 418              */
 419             if (!SetEnvironmentVariableA( "CMDLINE", cmd ))
 420             {
 421                 HeapFree(GetProcessHeap(), 0, cmd );
 422                 return;
 423             }
 424
 425             HeapFree(GetProcessHeap(), 0, cmd );
 426             dos_length = 127;
 427         }
 428     }
 429
 430     if (MZ_DoLoadImage( hFile, filename, NULL, 0 ))
 431         MZ_Launch( dos_cmdtail, dos_length );
 432 }
 433
 434 /***********************************************************************
 435  *              MZ_Exec
 436  *
 437  * this may only be called from existing DOS processes
 438  */
 439 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
 440 {
 441   DWORD binType;
 442   STARTUPINFOA st;
 443   PROCESS_INFORMATION pe;
 444   HANDLE hFile;
 445
 446   BOOL ret = FALSE;
 447
 448   if(!GetBinaryTypeA(filename, &binType))   /* determine what kind of binary this is */
 449   {
 450     return FALSE; /* binary is not an executable */
 451   }
 452
 453   /* handle non-dos executables */
 454   if(binType != SCS_DOS_BINARY)
 455   {
 456     if(func == 0) /* load and execute */
 457     {
 458       LPSTR fullCmdLine;
 459       WORD fullCmdLength;
 460       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 461       PDB16 *psp = (PDB16 *)psp_start;
 462       ExecBlock *blk = (ExecBlock *)paramblk;
 463       LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
 464       LPBYTE envblock = PTR_REAL_TO_LIN(psp->environment, 0);
 465       int    cmdLength = cmdline[0];
 466
 467       /*
 468        * If cmdLength is 127, command tail is truncated and environment
 469        * variable CMDLINE should contain full command line
 470        * (this includes filename).
 471        */
 472       if (cmdLength == 127)
 473       {
 474           FIXME( "CMDLINE argument passing is unimplemented.\n" );
 475           cmdLength = 126; /* FIXME */
 476       }
 477
 478       fullCmdLength = (strlen(filename) + 1) + cmdLength + 1; /* filename + space + cmdline + terminating null character */
 479
 480       fullCmdLine = HeapAlloc(GetProcessHeap(), 0, fullCmdLength);
 481       if(!fullCmdLine) return FALSE; /* return false on memory alloc failure */
 482
 483       /* build the full command line from the executable file and the command line being passed in */
 484       snprintf(fullCmdLine, fullCmdLength, "%s ", filename); /* start off with the executable filename and a space */
 485       memcpy(fullCmdLine + strlen(fullCmdLine), cmdline + 1, cmdLength); /* append cmdline onto the end */
 486       fullCmdLine[fullCmdLength - 1] = 0; /* null terminate string */
 487
 488       ZeroMemory (&st, sizeof(STARTUPINFOA));
 489       st.cb = sizeof(STARTUPINFOA);
 490       ret = CreateProcessA (NULL, fullCmdLine, NULL, NULL, TRUE, 0, envblock, NULL, &st, &pe);
 491
 492       /* wait for the app to finish and clean up PROCESS_INFORMATION handles */
 493       if(ret)
 494       {
 495         WaitForSingleObject(pe.hProcess, INFINITE);  /* wait here until the child process is complete */
 496         CloseHandle(pe.hProcess);
 497         CloseHandle(pe.hThread);
 498       }
 499
 500       HeapFree(GetProcessHeap(), 0, fullCmdLine);  /* free the memory we allocated */
 501     }
 502     else
 503     {
 504       FIXME("EXEC type of %d not implemented for non-dos executables\n", func);
 505       ret = FALSE;
 506     }
 507
 508     return ret;
 509   } /* if(binType != SCS_DOS_BINARY) */
 510
 511
 512   /* handle dos executables */
 513
 514   hFile = CreateFileA( filename, GENERIC_READ, FILE_SHARE_READ,
 515                              NULL, OPEN_EXISTING, 0, 0);
 516   if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 517
 518   switch (func) {
 519   case 0: /* load and execute */
 520   case 1: /* load but don't execute */
 521     {
 522       /* save current process's return SS:SP now */
 523       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 524       PDB16 *psp = (PDB16 *)psp_start;
 525       psp->saveStack = (DWORD)MAKESEGPTR(context->SegSs, LOWORD(context->Esp));
 526     }
 527     ret = MZ_DoLoadImage( hFile, filename, NULL, ((ExecBlock *)paramblk)->env_seg );
 528     if (ret) {
 529       /* MZ_LoadImage created a new PSP and loaded new values into it,
 530        * let's work on the new values now */
 531       LPBYTE psp_start = (LPBYTE)((DWORD)DOSVM_psp << 4);
 532       ExecBlock *blk = (ExecBlock *)paramblk;
 533       LPBYTE cmdline = PTR_REAL_TO_LIN(SELECTOROF(blk->cmdline),OFFSETOF(blk->cmdline));
 534
 535       /* First character contains the length of the command line. */
 536       MZ_FillPSP(psp_start, (LPSTR)cmdline + 1, cmdline[0]);
 537
 538       /* the lame MS-DOS engineers decided that the return address should be in int22 */
 539       DOSVM_SetRMHandler(0x22, (FARPROC16)MAKESEGPTR(context->SegCs, LOWORD(context->Eip)));
 540       if (func) {
 541         /* don't execute, just return startup state */
 542         /*
 543          * From Ralph Brown:
 544          *  For function 01h, the AX value to be passed to the child program
 545          *  is put on top of the child's stack
 546          */
 547         LPBYTE stack;
 548         init_sp -= 2;
 549         stack = (LPBYTE) CTX_SEG_OFF_TO_LIN(context, init_ss, init_sp);
 550         /* FIXME: push AX correctly */
 551         stack[0] = 0x00;    /* push AL */
 552         stack[1] = 0x00;    /* push AH */
 553
 554         blk->init_cs = init_cs;
 555         blk->init_ip = init_ip;
 556         blk->init_ss = init_ss;
 557         blk->init_sp = init_sp;
 558       } else {
 559         /* execute by making us return to new process */
 560         context->SegCs = init_cs;
 561         context->Eip   = init_ip;
 562         context->SegSs = init_ss;
 563         context->Esp   = init_sp;
 564         context->SegDs = DOSVM_psp;
 565         context->SegEs = DOSVM_psp;
 566         context->Eax   = 0;
 567       }
 568     }
 569     break;
 570   case 3: /* load overlay */
 571     {
 572       OverlayBlock *blk = (OverlayBlock *)paramblk;
 573       ret = MZ_DoLoadImage( hFile, filename, blk, 0);
 574     }
 575     break;
 576   default:
 577     FIXME("EXEC load type %d not implemented\n", func);
 578     SetLastError(ERROR_INVALID_FUNCTION);
 579     break;
 580   }
 581   CloseHandle(hFile);
 582   return ret;
 583 }
 584
 585 /***********************************************************************
 586  *              MZ_AllocDPMITask
 587  */
 588 void WINAPI MZ_AllocDPMITask( void )
 589 {
 590   MZ_InitMemory();
 591   MZ_InitTask();
 592 }
 593
 594 /***********************************************************************
 595  *              MZ_RunInThread
 596  */
 597 void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
 598 {
 599   if (loop_thread) {
 600     DOS_SPC spc;
 601     HANDLE event;
 602
 603     spc.proc = proc;
 604     spc.arg = arg;
 605     event = CreateEventW(NULL, TRUE, FALSE, NULL);
 606     PostThreadMessageA(loop_tid, WM_USER, (WPARAM)event, (LPARAM)&spc);
 607     WaitForSingleObject(event, INFINITE);
 608     CloseHandle(event);
 609   } else
 610     proc(arg);
 611 }
 612
 613 static DWORD WINAPI MZ_DOSVM( LPVOID lpExtra )
 614 {
 615   CONTEXT context;
 616   DWORD ret;
 617
 618   dosvm_pid = getpid();
 619
 620   memset( &context, 0, sizeof(context) );
 621   context.SegCs  = init_cs;
 622   context.Eip    = init_ip;
 623   context.SegSs  = init_ss;
 624   context.Esp    = init_sp;
 625   context.SegDs  = DOSVM_psp;
 626   context.SegEs  = DOSVM_psp;
 627   context.EFlags = V86_FLAG | VIF_MASK;
 628   DOSVM_SetTimer(0x10000);
 629   ret = DOSVM_Enter( &context );
 630
 631   dosvm_pid = 0;
 632   return ret;
 633 }
 634
 635 static BOOL MZ_InitTask(void)
 636 {
 637   if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
 638                        GetCurrentProcess(), &loop_thread,
 639                        0, FALSE, DUPLICATE_SAME_ACCESS))
 640     return FALSE;
 641   dosvm_thread = CreateThread(NULL, 0, MZ_DOSVM, NULL, CREATE_SUSPENDED, &dosvm_tid);
 642   if (!dosvm_thread) {
 643     CloseHandle(loop_thread);
 644     loop_thread = 0;
 645     return FALSE;
 646   }
 647   loop_tid = GetCurrentThreadId();
 648   return TRUE;
 649 }
 650
 651 static void MZ_Launch( LPCSTR cmdtail, int length )
 652 {
 653   TDB *pTask = GlobalLock16( GetCurrentTask() );
 654   BYTE *psp_start = PTR_REAL_TO_LIN( DOSVM_psp, 0 );
 655   DWORD rv;
 656   SYSLEVEL *lock;
 657
 658   MZ_FillPSP(psp_start, cmdtail, length);
 659   pTask->flags |= TDBF_WINOLDAP;
 660
 661   /* DTA is set to PSP:0080h when a program is started. */
 662   pTask->dta = MAKESEGPTR( DOSVM_psp, 0x80 );
 663
 664   GetpWin16Lock( &lock );
 665   _LeaveSysLevel( lock );
 666
 667   ResumeThread(dosvm_thread);
 668   rv = DOSVM_Loop(dosvm_thread);
 669
 670   CloseHandle(dosvm_thread);
 671   dosvm_thread = 0; dosvm_tid = 0;
 672   CloseHandle(loop_thread);
 673   loop_thread = 0; loop_tid = 0;
 674
 675   VGA_Clean();
 676   ExitProcess(rv);
 677 }
 678
 679 /***********************************************************************
 680  *              MZ_Exit
 681  */
 682 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
 683 {
 684   if (DOSVM_psp) {
 685     WORD psp_seg = cs_psp ? context->SegCs : DOSVM_psp;
 686     LPBYTE psp_start = (LPBYTE)((DWORD)psp_seg << 4);
 687     PDB16 *psp = (PDB16 *)psp_start;
 688     WORD parpsp = psp->parentPSP; /* check for parent DOS process */
 689     if (parpsp) {
 690       /* retrieve parent's return address */
 691       FARPROC16 retaddr = DOSVM_GetRMHandler(0x22);
 692       /* restore interrupts */
 693       DOSVM_SetRMHandler(0x22, psp->savedint22);
 694       DOSVM_SetRMHandler(0x23, psp->savedint23);
 695       DOSVM_SetRMHandler(0x24, psp->savedint24);
 696       /* FIXME: deallocate file handles etc */
 697       /* free process's associated memory
 698        * FIXME: walk memory and deallocate all blocks owned by process */
 699       DOSMEM_FreeBlock( PTR_REAL_TO_LIN(psp->environment,0) );
 700       DOSMEM_FreeBlock( PTR_REAL_TO_LIN(DOSVM_psp,0) );
 701       /* switch to parent's PSP */
 702       DOSVM_psp = parpsp;
 703       psp_start = (LPBYTE)((DWORD)parpsp << 4);
 704       psp = (PDB16 *)psp_start;
 705       /* now return to parent */
 706       DOSVM_retval = retval;
 707       context->SegCs = SELECTOROF(retaddr);
 708       context->Eip   = OFFSETOF(retaddr);
 709       context->SegSs = SELECTOROF(psp->saveStack);
 710       context->Esp   = OFFSETOF(psp->saveStack);
 711       return;
 712     } else
 713       TRACE("killing DOS task\n");
 714   }
 715   ExitThread( retval );
 716 }
 717
 718
 719 /***********************************************************************
 720  *              MZ_Current
 721  */
 722 BOOL WINAPI MZ_Current( void )
 723 {
 724   return (dosvm_pid != 0); /* FIXME: do a better check */
 725 }
 726
 727 #else /* !MZ_SUPPORTED */
 728
 729 /***********************************************************************
 730  *              wine_load_dos_exe (WINEDOS.@)
 731  */
 732 void WINAPI wine_load_dos_exe( LPCSTR filename, LPCSTR cmdline )
 733 {
 734     FIXME("DOS executables not supported on this platform\n");
 735     SetLastError(ERROR_BAD_FORMAT);
 736 }
 737
 738 /***********************************************************************
 739  *              MZ_Exec
 740  */
 741 BOOL WINAPI MZ_Exec( CONTEXT86 *context, LPCSTR filename, BYTE func, LPVOID paramblk )
 742 {
 743   /* can't happen */
 744   SetLastError(ERROR_BAD_FORMAT);
 745   return FALSE;
 746 }
 747
 748 /***********************************************************************
 749  *              MZ_AllocDPMITask
 750  */
 751 void WINAPI MZ_AllocDPMITask( void )
 752 {
 753     FIXME("Actual real-mode calls not supported on this platform!\n");
 754 }
 755
 756 /***********************************************************************
 757  *              MZ_RunInThread
 758  */
 759 void WINAPI MZ_RunInThread( PAPCFUNC proc, ULONG_PTR arg )
 760 {
 761     proc(arg);
 762 }
 763
 764 /***********************************************************************
 765  *              MZ_Exit
 766  */
 767 void WINAPI MZ_Exit( CONTEXT86 *context, BOOL cs_psp, WORD retval )
 768 {
 769   ExitThread( retval );
 770 }
 771
 772 /***********************************************************************
 773  *              MZ_Current
 774  */
 775 BOOL WINAPI MZ_Current( void )
 776 {
 777     return FALSE;
 778 }
 779
 780 #endif /* !MZ_SUPPORTED */