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