loader/dos/module.c

   1 /*
   2  * DOS (MZ) loader
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This code hasn't been completely cleaned up yet.
   7  */
   8
   9 #include "config.h"
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <unistd.h>
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <sys/time.h>
  21 #include "windef.h"
  22 #include "wine/winbase16.h"
  23 #include "winerror.h"
  24 #include "module.h"
  25 #include "peexe.h"
  26 #include "neexe.h"
  27 #include "task.h"
  28 #include "selectors.h"
  29 #include "file.h"
  30 #include "ldt.h"
  31 #include "process.h"
  32 #include "miscemu.h"
  33 #include "debugtools.h"
  34 #include "dosexe.h"
  35 #include "dosmod.h"
  36 #include "options.h"
  37 #include "server.h"
  38 #include "vga.h"
  39
  40 DEFAULT_DEBUG_CHANNEL(module)
  41
  42 #ifdef MZ_SUPPORTED
  43
  44 #ifdef HAVE_SYS_MMAN_H
  45 # include <sys/mman.h>
  46 #endif
  47
  48 /* define this to try mapping through /proc/pid/mem instead of a temp file,
  49    but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
  50 #undef MZ_MAPSELF
  51
  52 #define BIOS_DATA_SEGMENT 0x40
  53 #define START_OFFSET 0
  54 #define PSP_SIZE 0x10
  55
  56 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
  57 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
  58
  59 static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, WORD env )
  60 {
  61  PDB16*psp=lpPSP;
  62  const char*cmd=cmdline?strchr(cmdline,' '):NULL;
  63
  64  psp->int20=0x20CD; /* int 20 */
  65  /* some programs use this to calculate how much memory they need */
  66  psp->nextParagraph=0x9FFF;
  67  psp->environment=env;
  68  /* copy parameters */
  69  if (cmd) {
  70 #if 0
  71   /* command.com doesn't do this */
  72   while (*cmd == ' ') cmd++;
  73 #endif
  74   psp->cmdLine[0]=strlen(cmd);
  75   strcpy(psp->cmdLine+1,cmd);
  76   psp->cmdLine[psp->cmdLine[0]+1]='\r';
  77  } else psp->cmdLine[1]='\r';
  78  /* FIXME: integrate the memory stuff from Wine (msdos/dosmem.c) */
  79  /* FIXME: integrate the PDB stuff from Wine (loader/task.c) */
  80 }
  81
  82 /* default INT 08 handler: increases timer tick counter but not much more */
  83 static char int08[]={
  84  0xCD,0x1C,           /* int $0x1c */
  85  0x50,                /* pushw %ax */
  86  0x1E,                /* pushw %ds */
  87  0xB8,0x40,0x00,      /* movw $0x40,%ax */
  88  0x8E,0xD8,           /* movw %ax,%ds */
  89 #if 0
  90  0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
  91  0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
  92 #else
  93  0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
  94 #endif
  95  0xB0,0x20,           /* movb $0x20,%al */
  96  0xE6,0x20,           /* outb %al,$0x20 */
  97  0x1F,                /* popw %ax */
  98  0x58,                /* popw %ax */
  99  0xCF                 /* iret */
 100 };
 101
 102 static void MZ_InitHandlers( LPDOSTASK lpDosTask )
 103 {
 104  WORD seg;
 105  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(int08),&seg);
 106  memcpy(start,int08,sizeof(int08));
 107 /* INT 08: point it at our tick-incrementing handler */
 108  ((SEGPTR*)(lpDosTask->img))[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
 109 /* INT 1C: just point it to IRET, we don't want to handle it ourselves */
 110  ((SEGPTR*)(lpDosTask->img))[0x1C]=PTR_SEG_OFF_TO_SEGPTR(seg,sizeof(int08)-1);
 111 }
 112
 113 static char enter_xms[]={
 114 /* XMS hookable entry point */
 115  0xEB,0x03,           /* jmp entry */
 116  0x90,0x90,0x90,      /* nop;nop;nop */
 117                       /* entry: */
 118 /* real entry point */
 119 /* for simplicity, we'll just use the same hook as DPMI below */
 120  0xCD,0x31,           /* int $0x31 */
 121  0xCB                 /* lret */
 122 };
 123
 124 static void MZ_InitXMS( LPDOSTASK lpDosTask )
 125 {
 126  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
 127  memcpy(start,enter_xms,sizeof(enter_xms));
 128 }
 129
 130 static char enter_pm[]={
 131  0x50,                /* pushw %ax */
 132  0x52,                /* pushw %dx */
 133  0x55,                /* pushw %bp */
 134  0x89,0xE5,           /* movw %sp,%bp */
 135 /* get return CS */
 136  0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 137 /* just call int 31 here to get into protected mode... */
 138 /* it'll check whether it was called from dpmi_seg... */
 139  0xCD,0x31,           /* int $0x31 */
 140 /* we are now in the context of a 16-bit relay call */
 141 /* need to fixup our stack;
 142  * 16-bit relay return address will be lost, but we won't worry quite yet */
 143  0x8E,0xD0,           /* movw %ax,%ss */
 144  0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 145 /* set return CS */
 146  0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 147  0x5D,                /* popw %bp */
 148  0x5A,                /* popw %dx */
 149  0x58,                /* popw %ax */
 150  0xCB                 /* lret */
 151 };
 152
 153 static void MZ_InitDPMI( LPDOSTASK lpDosTask )
 154 {
 155  unsigned size=sizeof(enter_pm);
 156  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,size,&(lpDosTask->dpmi_seg));
 157
 158  lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, size, SEGMENT_CODE, FALSE, FALSE );
 159
 160  memcpy(start,enter_pm,sizeof(enter_pm));
 161 }
 162
 163 static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
 164 {
 165  unsigned sz=0;
 166  WORD seg;
 167  LPSTR envblk;
 168
 169  if (env) {
 170   /* get size of environment block */
 171   while (env[sz++]) sz+=strlen(env+sz)+1;
 172  } else sz++;
 173  /* allocate it */
 174  envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
 175  /* fill it */
 176  if (env) {
 177   memcpy(envblk,env,sz);
 178  } else envblk[0]=0;
 179  /* DOS 3.x: the block contains 1 additional string */
 180  *(WORD*)(envblk+sz)=1;
 181  /* being the program name itself */
 182  strcpy(envblk+sz+sizeof(WORD),name);
 183  return seg;
 184 }
 185
 186 static BOOL MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
 187 {
 188  int x;
 189
 190  if (lpDosTask->img) return TRUE; /* already allocated */
 191
 192  /* allocate 1MB+64K shared memory */
 193  lpDosTask->img_ofs=START_OFFSET;
 194 #ifdef MZ_MAPSELF
 195  lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
 196  /* make sure mmap accepts it */
 197  ((char*)lpDosTask->img)[0x10FFFF]=0;
 198 #else
 199  tmpnam(lpDosTask->mm_name);
 200 /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */
 201  lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
 202  if (lpDosTask->mm_fd<0) ERR("file %s could not be opened\n",lpDosTask->mm_name);
 203  /* expand file to 1MB+64K */
 204  lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET);
 205  x=0; write(lpDosTask->mm_fd,&x,1);
 206  /* map it in */
 207  lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0);
 208 #endif
 209  if (lpDosTask->img==(LPVOID)-1) {
 210   ERR("could not map shared memory, error=%s\n",strerror(errno));
 211   return FALSE;
 212  }
 213  TRACE("DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
 214  pModule->dos_image=lpDosTask->img;
 215
 216  /* initialize the memory */
 217  TRACE("Initializing DOS memory structures\n");
 218  DOSMEM_Init(lpDosTask->hModule);
 219  MZ_InitHandlers(lpDosTask);
 220  MZ_InitXMS(lpDosTask);
 221  MZ_InitDPMI(lpDosTask);
 222  return TRUE;
 223 }
 224
 225 static BOOL MZ_LoadImage( HANDLE hFile, LPCSTR filename, LPCSTR cmdline,
 226                           LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
 227 {
 228  IMAGE_DOS_HEADER mz_header;
 229  DWORD image_start,image_size,min_size,max_size,avail;
 230  BYTE*psp_start,*load_start;
 231  int x,old_com=0;
 232  SEGPTR reloc;
 233  WORD env_seg;
 234  DWORD len;
 235
 236  SetFilePointer(hFile,0,NULL,FILE_BEGIN);
 237  if (   !ReadFile(hFile,&mz_header,sizeof(mz_header),&len,NULL)
 238      || len != sizeof(mz_header)
 239      || mz_header.e_magic != IMAGE_DOS_SIGNATURE) {
 240   old_com=1; /* assume .COM file */
 241   image_start=0;
 242   image_size=GetFileSize(hFile,NULL);
 243   min_size=0x10000; max_size=0x100000;
 244   mz_header.e_crlc=0;
 245   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 246   mz_header.e_cs=0; mz_header.e_ip=0x100;
 247  } else {
 248   /* calculate load size */
 249   image_start=mz_header.e_cparhdr<<4;
 250   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 251   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 252   image_size-=image_start;
 253   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 254   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 255  }
 256
 257  MZ_InitMemory(lpDosTask,pModule);
 258
 259  /* allocate environment block */
 260  env_seg=MZ_InitEnvironment(lpDosTask,env,filename);
 261
 262  /* allocate memory for the executable */
 263  TRACE("Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 264  avail=DOSMEM_Available(lpDosTask->hModule);
 265  if (avail<min_size) {
 266   ERR("insufficient DOS memory\n");
 267   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 268   return FALSE;
 269  }
 270  if (avail>max_size) avail=max_size;
 271  psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
 272  if (!psp_start) {
 273   ERR("error allocating DOS memory\n");
 274   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 275   return FALSE;
 276  }
 277  lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
 278  load_start=psp_start+(PSP_SIZE<<4);
 279  MZ_InitPSP(psp_start, cmdline, env_seg);
 280
 281  /* load executable image */
 282  TRACE("loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 283  SetFilePointer(hFile,image_start,NULL,FILE_BEGIN);
 284  if (!ReadFile(hFile,load_start,image_size,&len,NULL) || len != image_size) {
 285   SetLastError(ERROR_BAD_FORMAT);
 286   return FALSE;
 287  }
 288
 289  if (mz_header.e_crlc) {
 290   /* load relocation table */
 291   TRACE("loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
 292   /* FIXME: is this too slow without read buffering? */
 293   SetFilePointer(hFile,mz_header.e_lfarlc,NULL,FILE_BEGIN);
 294   for (x=0; x<mz_header.e_crlc; x++) {
 295    if (!ReadFile(hFile,&reloc,sizeof(reloc),&len,NULL) || len != sizeof(reloc)) {
 296     SetLastError(ERROR_BAD_FORMAT);
 297     return FALSE;
 298    }
 299    *(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
 300   }
 301  }
 302
 303  lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
 304  lpDosTask->init_ip=mz_header.e_ip;
 305  lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
 306  lpDosTask->init_sp=mz_header.e_sp;
 307
 308  TRACE("entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
 309  return TRUE;
 310 }
 311
 312 LPDOSTASK MZ_AllocDPMITask( HMODULE16 hModule )
 313 {
 314  LPDOSTASK lpDosTask = calloc(1, sizeof(DOSTASK));
 315  NE_MODULE *pModule;
 316
 317  if (lpDosTask) {
 318   lpDosTask->hModule = hModule;
 319
 320   pModule = (NE_MODULE *)GlobalLock16(hModule);
 321   pModule->lpDosTask = lpDosTask;
 322
 323   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 324
 325   MZ_InitMemory(lpDosTask, pModule);
 326
 327   GlobalUnlock16(hModule);
 328  }
 329  return lpDosTask;
 330 }
 331
 332 static void MZ_InitTimer( LPDOSTASK lpDosTask, int ver )
 333 {
 334  if (ver<1) {
 335   /* can't make timer ticks */
 336  } else {
 337   int func;
 338   struct timeval tim;
 339
 340   /* start dosmod timer at 55ms (18.2Hz) */
 341   func=DOSMOD_SET_TIMER;
 342   tim.tv_sec=0; tim.tv_usec=54925;
 343   write(lpDosTask->write_pipe,&func,sizeof(func));
 344   write(lpDosTask->write_pipe,&tim,sizeof(tim));
 345  }
 346 }
 347
 348 BOOL MZ_InitTask( LPDOSTASK lpDosTask )
 349 {
 350   int write_fd[2],x_fd;
 351   pid_t child;
 352   char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
 353   SECURITY_ATTRIBUTES attr={sizeof(attr),NULL,TRUE};
 354   struct get_read_fd_request *r_req = get_req_buffer();
 355   struct get_write_fd_request *w_req = get_req_buffer();
 356
 357   if (!lpDosTask) return FALSE;
 358   /* create pipes */
 359   /* this happens in the wrong process context, so we have to let the new process
 360      inherit it... (FIXME: call MZ_InitTask in the right process context) */
 361   if (!CreatePipe(&(lpDosTask->hReadPipe),&(lpDosTask->hXPipe),&attr,0)) return FALSE;
 362   if (pipe(write_fd)<0) {
 363     CloseHandle(lpDosTask->hReadPipe);
 364     CloseHandle(lpDosTask->hXPipe);
 365     return FALSE;
 366   }
 367   r_req->handle = lpDosTask->hReadPipe;
 368   server_call_fd( REQ_GET_READ_FD, -1, &lpDosTask->read_pipe );
 369   w_req->handle = lpDosTask->hXPipe;
 370   server_call_fd( REQ_GET_WRITE_FD, -1, &x_fd );
 371
 372   TRACE("win32 pipe: read=%d, write=%d, unix pipe: read=%d, write=%d\n",
 373                lpDosTask->hReadPipe,lpDosTask->hXPipe,lpDosTask->read_pipe,x_fd);
 374   TRACE("outbound unix pipe: read=%d, write=%d, pid=%d\n",write_fd[0],write_fd[1],getpid());
 375
 376   lpDosTask->write_pipe=write_fd[1];
 377
 378   lpDosTask->hConInput=GetStdHandle(STD_INPUT_HANDLE);
 379   lpDosTask->hConOutput=GetStdHandle(STD_OUTPUT_HANDLE);
 380
 381   /* if we have a mapping file, use it */
 382   fname=lpDosTask->mm_name; farg=NULL;
 383   if (!fname[0]) {
 384     /* otherwise, map our own memory image */
 385     sprintf(fproc,"/proc/%d/mem",getpid());
 386     sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
 387     fname=fproc; farg=arg;
 388   }
 389
 390   TRACE("Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
 391   if ((child=fork())<0) {
 392     close(write_fd[0]);
 393     close(lpDosTask->read_pipe);
 394     close(lpDosTask->write_pipe);
 395     close(x_fd);
 396     CloseHandle(lpDosTask->hReadPipe);
 397     CloseHandle(lpDosTask->hXPipe);
 398     return FALSE;
 399   }
 400  if (child!=0) {
 401   /* parent process */
 402   int ret;
 403
 404   close(write_fd[0]);
 405   close(x_fd);
 406   lpDosTask->task=child;
 407   /* wait for child process to signal readiness */
 408   while (1) {
 409     if (read(lpDosTask->read_pipe,&ret,sizeof(ret))==sizeof(ret)) break;
 410     if ((errno==EINTR)||(errno==EAGAIN)) continue;
 411     /* failure */
 412     ERR("dosmod has failed to initialize\n");
 413     if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 414     return FALSE;
 415   }
 416   /* the child has now mmaped the temp file, it's now safe to unlink.
 417    * do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
 418   if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 419   /* start simulated system timer */
 420   MZ_InitTimer(lpDosTask,ret);
 421   if (ret<2) {
 422     ERR("dosmod version too old! Please install newer dosmod properly\n");
 423     ERR("If you don't, the new dosmod event handling system will not work\n");
 424   }
 425   /* all systems are now go */
 426  } else {
 427   /* child process */
 428   close(lpDosTask->read_pipe);
 429   close(lpDosTask->write_pipe);
 430   /* put our pipes somewhere dosmod can find them */
 431   dup2(write_fd[0],0); /* stdin */
 432   dup2(x_fd,1);        /* stdout */
 433   /* now load dosmod */
 434   /* check argv[0]-derived paths first, since the newest dosmod is most likely there
 435    * (at least it was once for Andreas Mohr, so I decided to make it easier for him) */
 436   fpath=strrchr(strcpy(path,argv0),'/');
 437   if (fpath) {
 438    strcpy(fpath,"/dosmod");
 439    execl(path,fname,farg,NULL);
 440    strcpy(fpath,"/loader/dos/dosmod");
 441    execl(path,fname,farg,NULL);
 442   }
 443   /* okay, it wasn't there, try in the path */
 444   execlp("dosmod",fname,farg,NULL);
 445   /* last desperate attempts: current directory */
 446   execl("dosmod",fname,farg,NULL);
 447   /* and, just for completeness... */
 448   execl("loader/dos/dosmod",fname,farg,NULL);
 449   /* if failure, exit */
 450   ERR("Failed to spawn dosmod, error=%s\n",strerror(errno));
 451   exit(1);
 452  }
 453  return TRUE;
 454 }
 455
 456 BOOL MZ_CreateProcess( HANDLE hFile, LPCSTR filename, LPCSTR cmdline, LPCSTR env,
 457                        LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
 458                        BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
 459                        LPPROCESS_INFORMATION info )
 460 {
 461  LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
 462  HMODULE16 hModule;
 463  PDB *pdb = PROCESS_Current();
 464  TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
 465  NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 466  int alloc = !(pModule && pModule->dos_image);
 467
 468  if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL) {
 469   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 470   return FALSE;
 471  }
 472
 473  if ((!env)&&pdb) env = pdb->env_db->environ;
 474  if (alloc) {
 475   if ((hModule = MODULE_CreateDummyModule(filename, 0)) < 32) {
 476    SetLastError(hModule);
 477    return FALSE;
 478   }
 479   lpDosTask->hModule = hModule;
 480
 481   pModule = (NE_MODULE *)GlobalLock16(hModule);
 482   pModule->lpDosTask = lpDosTask;
 483
 484   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 485  } else lpDosTask=pModule->lpDosTask;
 486  if (!MZ_LoadImage( hFile, filename, cmdline, env, lpDosTask, pModule )) {
 487   if (alloc) {
 488    if (lpDosTask->mm_name[0]!=0) {
 489     if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
 490     if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
 491     unlink(lpDosTask->mm_name);
 492    } else
 493     if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 494   }
 495   return FALSE;
 496  }
 497  if (alloc) {
 498   pModule->dos_image = lpDosTask->img;
 499   if (!MZ_InitTask( lpDosTask )) {
 500    MZ_KillModule( lpDosTask );
 501    /* FIXME: cleanup hModule */
 502    SetLastError(ERROR_GEN_FAILURE);
 503    return FALSE;
 504   }
 505   inherit = TRUE; /* bad hack for inheriting the CreatePipe... */
 506   if (!PROCESS_Create( pModule, hFile, cmdline, env,
 507                        psa, tsa, inherit, flags, startup, info ))
 508    return FALSE;
 509  }
 510  return TRUE;
 511 }
 512
 513 void MZ_KillModule( LPDOSTASK lpDosTask )
 514 {
 515   DOSEVENT *event,*p_event;
 516   DOSSYSTEM *sys,*p_sys;
 517
 518   TRACE("killing DOS task\n");
 519   VGA_Clean();
 520   if (lpDosTask->mm_name[0]!=0) {
 521     munmap(lpDosTask->img,0x110000-START_OFFSET);
 522     close(lpDosTask->mm_fd);
 523   } else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 524   close(lpDosTask->read_pipe);
 525   close(lpDosTask->write_pipe);
 526   CloseHandle(lpDosTask->hReadPipe);
 527   CloseHandle(lpDosTask->hXPipe);
 528   kill(lpDosTask->task,SIGTERM);
 529 /* free memory allocated for events and systems */
 530 #define DFREE(var,pvar,svar) \
 531   var = lpDosTask->svar; \
 532   while (var) { \
 533     if (var->data) free(var->data); \
 534     pvar = var->next; free(var); var = pvar; \
 535   }
 536
 537   DFREE(event,p_event,pending)
 538   DFREE(event,p_event,current)
 539   DFREE(sys,p_sys,sys)
 540
 541 #undef DFREE
 542
 543 #if 0
 544   /* FIXME: this seems to crash */
 545   if (lpDosTask->dpmi_sel)
 546     SELECTOR_FreeBlock(lpDosTask->dpmi_sel, 1);
 547 #endif
 548 }
 549
 550 LPDOSTASK MZ_Current( void )
 551 {
 552   TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 553   NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 554
 555   GlobalUnlock16( GetCurrentTask() );
 556
 557   if (pModule)
 558     return pModule->lpDosTask;
 559
 560   return NULL;
 561 }
 562
 563 #else /* !MZ_SUPPORTED */
 564
 565 BOOL MZ_CreateProcess( HANDLE hFile, LPCSTR filename, LPCSTR cmdline, LPCSTR env,
 566                        LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
 567                        BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
 568                        LPPROCESS_INFORMATION info )
 569 {
 570  WARN("DOS executables not supported on this architecture\n");
 571  SetLastError(ERROR_BAD_FORMAT);
 572  return FALSE;
 573 }
 574
 575 LPDOSTASK MZ_Current( void )
 576 {
 577   return NULL;
 578 }
 579
 580 #endif