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 <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <errno.h>
  13 #include <fcntl.h>
  14 #include <signal.h>
  15 #include <unistd.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include "windows.h"
  19 #include "winbase.h"
  20 #include "module.h"
  21 #include "task.h"
  22 #include "selectors.h"
  23 #include "file.h"
  24 #include "ldt.h"
  25 #include "process.h"
  26 #include "miscemu.h"
  27 #include "debug.h"
  28 #include "dosexe.h"
  29 #include "options.h"
  30
  31 #ifdef MZ_SUPPORTED
  32
  33 #include <sys/mman.h>
  34
  35 /* define this to try mapping through /proc/pid/mem instead of a temp file,
  36    but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
  37 #undef MZ_MAPSELF
  38
  39 #define BIOS_DATA_SEGMENT 0x40
  40 #define START_OFFSET 0
  41 #define PSP_SIZE 0x10
  42
  43 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
  44 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
  45
  46 static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, WORD env )
  47 {
  48  PDB*psp=lpPSP;
  49  const char*cmd=cmdline?strchr(cmdline,' '):NULL;
  50
  51  psp->int20=0x20CD; /* int 20 */
  52  /* some programs use this to calculate how much memory they need */
  53  psp->nextParagraph=0x9FFF;
  54  psp->environment=env;
  55  /* copy parameters */
  56  if (cmd) {
  57 #if 0
  58   /* command.com doesn't do this */
  59   while (*cmd == ' ') cmd++;
  60 #endif
  61   psp->cmdLine[0]=strlen(cmd);
  62   strcpy(psp->cmdLine+1,cmd);
  63   psp->cmdLine[psp->cmdLine[0]+1]='\r';
  64  } else psp->cmdLine[1]='\r';
  65  /* FIXME: integrate the memory stuff from Wine (msdos/dosmem.c) */
  66  /* FIXME: integrate the PDB stuff from Wine (loader/task.c) */
  67 }
  68
  69 static char int08[]={
  70  0xCD,0x1C,           /* int $0x1c */
  71  0x50,                /* pushw %ax */
  72  0x1E,                /* pushw %ds */
  73  0xB8,0x40,0x00,      /* movw $0x40,%ax */
  74  0x8E,0xD8,           /* movw %ax,%ds */
  75 #if 0
  76  0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
  77  0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
  78 #else
  79  0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
  80 #endif
  81  0xB0,0x20,           /* movb $0x20,%al */
  82  0xE6,0x20,           /* outb %al,$0x20 */
  83  0x1F,                /* popw %ax */
  84  0x58,                /* popw %ax */
  85  0xCF                 /* iret */
  86 };
  87
  88 static void MZ_InitHandlers( LPDOSTASK lpDosTask )
  89 {
  90  WORD seg;
  91  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(int08),&seg);
  92  memcpy(start,int08,sizeof(int08));
  93  ((SEGPTR*)(lpDosTask->img))[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
  94 }
  95
  96 static char enter_xms[]={
  97 /* XMS hookable entry point */
  98  0xEB,0x03,           /* jmp entry */
  99  0x90,0x90,0x90,      /* nop;nop;nop */
 100                       /* entry: */
 101 /* real entry point */
 102 /* for simplicity, we'll just use the same hook as DPMI below */
 103  0xCD,0x31,           /* int $0x31 */
 104  0xCB                 /* lret */
 105 };
 106
 107 static void MZ_InitXMS( LPDOSTASK lpDosTask )
 108 {
 109  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
 110  memcpy(start,enter_xms,sizeof(enter_xms));
 111 }
 112
 113 static char enter_pm[]={
 114  0x50,                /* pushw %ax */
 115  0x52,                /* pushw %dx */
 116  0x55,                /* pushw %bp */
 117  0x89,0xE5,           /* movw %sp,%bp */
 118 /* get return CS */
 119  0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 120 /* just call int 31 here to get into protected mode... */
 121 /* it'll check whether it was called from dpmi_seg... */
 122  0xCD,0x31,           /* int $0x31 */
 123 /* we are now in the context of a 16-bit relay call */
 124 /* need to fixup our stack;
 125  * 16-bit relay return address will be lost, but we won't worry quite yet */
 126  0x8E,0xD0,           /* movw %ax,%ss */
 127  0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 128 /* set return CS */
 129  0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 130  0x5D,                /* popw %bp */
 131  0x5A,                /* popw %dx */
 132  0x58,                /* popw %ax */
 133  0xCB                 /* lret */
 134 };
 135
 136 static char wrap_rm[]={
 137  0xCD,0x31,           /* int $0x31 */
 138  0xCB                 /* lret */
 139 };
 140
 141 static void MZ_InitDPMI( LPDOSTASK lpDosTask )
 142 {
 143  unsigned size=sizeof(enter_pm)+sizeof(wrap_rm);
 144  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,size,&(lpDosTask->dpmi_seg));
 145
 146  lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, size, SEGMENT_CODE, FALSE, FALSE );
 147  lpDosTask->wrap_ofs = size-sizeof(wrap_rm);
 148  lpDosTask->call_ofs = size-1;
 149
 150  memcpy(start,enter_pm,sizeof(enter_pm));
 151  memcpy(start+sizeof(enter_pm),wrap_rm,sizeof(wrap_rm));
 152 }
 153
 154 static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
 155 {
 156  unsigned sz=0;
 157  WORD seg;
 158  LPSTR envblk;
 159
 160  if (env) {
 161   /* get size of environment block */
 162   while (env[sz++]) sz+=strlen(env+sz)+1;
 163  } else sz++;
 164  /* allocate it */
 165  envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
 166  /* fill it */
 167  if (env) {
 168   memcpy(envblk,env,sz);
 169  } else envblk[0]=0;
 170  /* DOS 3.x: the block contains 1 additional string */
 171  *(WORD*)(envblk+sz)=1;
 172  /* being the program name itself */
 173  strcpy(envblk+sz+sizeof(WORD),name);
 174  return seg;
 175 }
 176
 177 int MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
 178 {
 179  int x;
 180
 181  if (lpDosTask->img_ofs) return 32; /* already allocated */
 182
 183  /* allocate 1MB+64K shared memory */
 184  lpDosTask->img_ofs=START_OFFSET;
 185 #ifdef MZ_MAPSELF
 186  lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
 187  /* make sure mmap accepts it */
 188  ((char*)lpDosTask->img)[0x10FFFF]=0;
 189 #else
 190  tmpnam(lpDosTask->mm_name);
 191 /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */
 192  lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
 193  if (lpDosTask->mm_fd<0) ERR(module,"file %s could not be opened\n",lpDosTask->mm_name);
 194  /* expand file to 1MB+64K */
 195  lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET);
 196  x=0; write(lpDosTask->mm_fd,&x,1);
 197  /* map it in */
 198  lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0);
 199 #endif
 200  if (lpDosTask->img==(LPVOID)-1) {
 201   ERR(module,"could not map shared memory, error=%s\n",strerror(errno));
 202   return 0;
 203  }
 204  TRACE(module,"DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
 205  pModule->dos_image=lpDosTask->img;
 206
 207  /* initialize the memory */
 208  TRACE(module,"Initializing DOS memory structures\n");
 209  DOSMEM_Init(lpDosTask->hModule);
 210  MZ_InitXMS(lpDosTask);
 211  MZ_InitDPMI(lpDosTask);
 212  return lpDosTask->hModule;
 213 }
 214
 215 static int MZ_LoadImage( HFILE16 hFile, LPCSTR name, LPCSTR cmdline,
 216                          LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
 217 {
 218  IMAGE_DOS_HEADER mz_header;
 219  DWORD image_start,image_size,min_size,max_size,avail;
 220  BYTE*psp_start,*load_start;
 221  int x,old_com=0;
 222  SEGPTR reloc;
 223  WORD env_seg;
 224
 225  if ((_hread16(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) ||
 226      (mz_header.e_magic != IMAGE_DOS_SIGNATURE)) {
 227 #if 0
 228      return 11; /* invalid exe */
 229 #endif
 230   old_com=1; /* assume .COM file */
 231   image_start=0;
 232   image_size=GetFileSize(HFILE16_TO_HFILE32(hFile),NULL);
 233   min_size=0x10000; max_size=0x100000;
 234   mz_header.e_crlc=0;
 235   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 236   mz_header.e_cs=0; mz_header.e_ip=0x100;
 237  } else {
 238   /* calculate load size */
 239   image_start=mz_header.e_cparhdr<<4;
 240   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 241   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 242   image_size-=image_start;
 243   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 244   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 245  }
 246
 247  MZ_InitMemory(lpDosTask,pModule);
 248
 249  /* allocate environment block */
 250  env_seg=MZ_InitEnvironment(lpDosTask,env,name);
 251
 252  /* allocate memory for the executable */
 253  TRACE(module,"Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 254  avail=DOSMEM_Available(lpDosTask->hModule);
 255  if (avail<min_size) {
 256   ERR(module, "insufficient DOS memory\n");
 257   return 0;
 258  }
 259  if (avail>max_size) avail=max_size;
 260  psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
 261  if (!psp_start) {
 262   ERR(module, "error allocating DOS memory\n");
 263   return 0;
 264  }
 265  lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
 266  load_start=psp_start+(PSP_SIZE<<4);
 267  MZ_InitPSP(psp_start, cmdline, env_seg);
 268
 269  /* load executable image */
 270  TRACE(module,"loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 271  _llseek16(hFile,image_start,FILE_BEGIN);
 272  if ((_hread16(hFile,load_start,image_size)) != image_size)
 273   return 11; /* invalid exe */
 274
 275  if (mz_header.e_crlc) {
 276   /* load relocation table */
 277   TRACE(module,"loading DOS EXE relocation table, %d entries\n",mz_header.e_lfarlc);
 278   /* FIXME: is this too slow without read buffering? */
 279   _llseek16(hFile,mz_header.e_lfarlc,FILE_BEGIN);
 280   for (x=0; x<mz_header.e_crlc; x++) {
 281    if (_lread16(hFile,&reloc,sizeof(reloc)) != sizeof(reloc))
 282     return 11; /* invalid exe */
 283    *(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
 284   }
 285  }
 286
 287  lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
 288  lpDosTask->init_ip=mz_header.e_ip;
 289  lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
 290  lpDosTask->init_sp=mz_header.e_sp;
 291
 292  TRACE(module,"entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
 293
 294  return lpDosTask->hModule;
 295 }
 296
 297 LPDOSTASK MZ_AllocDPMITask( HMODULE16 hModule )
 298 {
 299  LPDOSTASK lpDosTask = calloc(1, sizeof(DOSTASK));
 300  NE_MODULE *pModule;
 301
 302  if (lpDosTask) {
 303   lpDosTask->hModule = hModule;
 304
 305   pModule = (NE_MODULE *)GlobalLock16(hModule);
 306   pModule->lpDosTask = lpDosTask;
 307
 308   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 309
 310   MZ_InitMemory(lpDosTask, pModule);
 311
 312   GlobalUnlock16(hModule);
 313  }
 314  return lpDosTask;
 315 }
 316
 317 int MZ_InitTask( LPDOSTASK lpDosTask )
 318 {
 319  int read_fd[2],write_fd[2];
 320  pid_t child;
 321  char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
 322
 323  if (!lpDosTask) return 0;
 324  /* create read pipe */
 325  if (pipe(read_fd)<0) return 0;
 326  if (pipe(write_fd)<0) {
 327   close(read_fd[0]); close(read_fd[1]); return 0;
 328  }
 329  lpDosTask->read_pipe=read_fd[0];
 330  lpDosTask->write_pipe=write_fd[1];
 331  /* if we have a mapping file, use it */
 332  fname=lpDosTask->mm_name; farg=NULL;
 333  if (!fname[0]) {
 334   /* otherwise, map our own memory image */
 335   sprintf(fproc,"/proc/%d/mem",getpid());
 336   sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
 337   fname=fproc; farg=arg;
 338  }
 339
 340  TRACE(module,"Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
 341  if ((child=fork())<0) {
 342   close(write_fd[0]); close(write_fd[1]);
 343   close(read_fd[0]); close(read_fd[1]); return 0;
 344  }
 345  if (child!=0) {
 346   /* parent process */
 347   int ret;
 348
 349   close(read_fd[1]); close(write_fd[0]);
 350   lpDosTask->task=child;
 351   /* wait for child process to signal readiness */
 352   do {
 353    if (read(lpDosTask->read_pipe,&ret,sizeof(ret))!=sizeof(ret)) {
 354     if ((errno==EINTR)||(errno==EAGAIN)) continue;
 355     /* failure */
 356     ERR(module,"dosmod has failed to initialize\n");
 357     if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 358     return 0;
 359    }
 360   } while (0);
 361   /* the child has now mmaped the temp file, it's now safe to unlink.
 362    * do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
 363   if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 364   /* all systems are now go */
 365  } else {
 366   /* child process */
 367   close(read_fd[0]); close(write_fd[1]);
 368   /* put our pipes somewhere dosmod can find them */
 369   dup2(write_fd[0],0);      /* stdin */
 370   dup2(read_fd[1],1);       /* stdout */
 371   /* now load dosmod */
 372   execlp("dosmod",fname,farg,NULL);
 373   execl("dosmod",fname,farg,NULL);
 374   /* hmm, they didn't install properly */
 375   execl("loader/dos/dosmod",fname,farg,NULL);
 376   /* last resort, try to find it through argv[0] */
 377   fpath=strrchr(strcpy(path,Options.argv0),'/');
 378   if (fpath) {
 379    strcpy(fpath,"/loader/dos/dosmod");
 380    execl(path,fname,farg,NULL);
 381   }
 382   /* if failure, exit */
 383   ERR(module,"Failed to spawn dosmod, error=%s\n",strerror(errno));
 384   exit(1);
 385  }
 386  /* start simulated system 55Hz timer */
 387  lpDosTask->system_timer = CreateSystemTimer( 55, (FARPROC16)MZ_Tick );
 388  TRACE(module,"created 55Hz timer tick, handle=%d\n",lpDosTask->system_timer);
 389  return lpDosTask->hModule;
 390 }
 391
 392 HINSTANCE16 MZ_CreateProcess( LPCSTR name, LPCSTR cmdline, LPCSTR env,
 393                               LPSTARTUPINFO32A startup, LPPROCESS_INFORMATION info )
 394 {
 395  LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
 396  HMODULE16 hModule;
 397  HINSTANCE16 hInstance;
 398  PDB32 *pdb = PROCESS_Current();
 399  TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
 400  NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 401  HFILE16 hFile;
 402  OFSTRUCT ofs;
 403  int err, alloc = !(pModule && pModule->dos_image);
 404
 405  GlobalUnlock16( GetCurrentTask() );
 406
 407  if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL)
 408   return 0;
 409
 410  if ((hFile = OpenFile16( name, &ofs, OF_READ )) == HFILE_ERROR16)
 411   return 2; /* File not found */
 412
 413  if ((!env)&&pdb) env = pdb->env_db->environ;
 414  if (alloc) {
 415   if ((hModule = MODULE_CreateDummyModule(&ofs)) < 32)
 416    return hModule;
 417
 418   lpDosTask->hModule = hModule;
 419
 420   pModule = (NE_MODULE *)GlobalLock16(hModule);
 421   pModule->lpDosTask = lpDosTask;
 422
 423   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 424  } else lpDosTask=pModule->lpDosTask;
 425  err = MZ_LoadImage( hFile, name, cmdline, env, lpDosTask, pModule );
 426  _lclose16(hFile);
 427  if (alloc) {
 428   pModule->dos_image = lpDosTask->img;
 429   if (err<32) {
 430    if (lpDosTask->mm_name[0]!=0) {
 431     if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
 432     if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
 433     unlink(lpDosTask->mm_name);
 434    } else
 435     if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 436    return err;
 437   }
 438   err = MZ_InitTask( lpDosTask );
 439   if (err<32) {
 440    MZ_KillModule( lpDosTask );
 441    /* FIXME: cleanup hModule */
 442    return err;
 443   }
 444
 445   hInstance = NE_CreateInstance(pModule, NULL, (cmdline == NULL));
 446   PROCESS_Create( pModule, cmdline, env, hInstance, 0, startup, info );
 447   return hInstance;
 448  } else {
 449   return (err<32) ? err : pTask->hInstance;
 450  }
 451 }
 452
 453 void MZ_KillModule( LPDOSTASK lpDosTask )
 454 {
 455  TRACE(module,"killing DOS task\n");
 456  SYSTEM_KillSystemTimer(lpDosTask->system_timer);
 457  if (lpDosTask->mm_name[0]!=0) {
 458   munmap(lpDosTask->img,0x110000-START_OFFSET);
 459   close(lpDosTask->mm_fd);
 460  } else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 461  close(lpDosTask->read_pipe);
 462  close(lpDosTask->write_pipe);
 463  kill(lpDosTask->task,SIGTERM);
 464 #if 0
 465  /* FIXME: this seems to crash */
 466  if (lpDosTask->dpmi_sel)
 467   UnMapLS(PTR_SEG_OFF_TO_SEGPTR(lpDosTask->dpmi_sel,0));
 468 #endif
 469 }
 470
 471 #else /* !MZ_SUPPORTED */
 472
 473 HINSTANCE16 MZ_CreateProcess( LPCSTR name, LPCSTR cmdline, LPCSTR env,
 474                               LPSTARTUPINFO32A startup, LPPROCESS_INFORMATION info )
 475 {
 476  WARN(module,"DOS executables not supported on this architecture\n");
 477  return (HMODULE16)11;  /* invalid exe */
 478 }
 479
 480 #endif