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 enter_xms[]={
  70 /* XMS hookable entry point */
  71  0xEB,0x03,      /* jmp entry */
  72  0x90,0x90,0x90, /* nop;nop;nop */
  73                  /* entry: */
  74 /* real entry point */
  75 /* for simplicity, we'll just use the same hook as DPMI below */
  76  0xCD,0x31,      /* int 0x31 */
  77  0xCB            /* retf */
  78 };
  79
  80 static void MZ_InitXMS( LPDOSTASK lpDosTask )
  81 {
  82  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
  83  memcpy(start,enter_xms,sizeof(enter_xms));
  84 }
  85
  86 static char enter_pm[]={
  87  0x50,                /* pushw %ax */
  88  0x52,                /* pushw %dx */
  89  0x55,                /* pushw %bp */
  90  0x89,0xE5,           /* movw %sp,%bp */
  91 /* get return CS */
  92  0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
  93 /* just call int 31 here to get into protected mode... */
  94 /* it'll check whether it was called from dpmi_seg... */
  95  0xCD,0x31,           /* int 0x31 */
  96 /* we are now in the context of a 16-bit relay call */
  97 /* need to fixup our stack;
  98  * 16-bit relay return address will be lost, but we won't worry quite yet */
  99  0x8E,0xD0,           /* movw %ax,%ss */
 100  0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 101 /* set return CS */
 102  0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 103  0x5D,                /* popw %bp */
 104  0x5A,                /* popw %dx */
 105  0x58,                /* popw %ax */
 106  0xCB                 /* retf */
 107 };
 108
 109 static void MZ_InitDPMI( LPDOSTASK lpDosTask )
 110 {
 111  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_pm),&(lpDosTask->dpmi_seg));
 112
 113  lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, sizeof(enter_pm), SEGMENT_CODE, FALSE, FALSE );
 114
 115  memcpy(start,enter_pm,sizeof(enter_pm));
 116 }
 117
 118 static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
 119 {
 120  unsigned sz=0;
 121  WORD seg;
 122  LPSTR envblk;
 123
 124  if (env) {
 125   /* get size of environment block */
 126   while (env[sz++]) sz+=strlen(env+sz);
 127  } else sz++;
 128  /* allocate it */
 129  envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
 130  /* fill it */
 131  if (env) {
 132   memcpy(envblk,env,sz);
 133  } else envblk[0]=0;
 134  /* DOS 3.x: the block contains 1 additional string */
 135  *(WORD*)(envblk+sz)=1;
 136  /* being the program name itself */
 137  strcpy(envblk+sz+sizeof(WORD),name);
 138  return seg;
 139 }
 140
 141 int MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
 142 {
 143  int x;
 144
 145  if (lpDosTask->img_ofs) return 32; /* already allocated */
 146
 147  /* allocate 1MB+64K shared memory */
 148  lpDosTask->img_ofs=START_OFFSET;
 149 #ifdef MZ_MAPSELF
 150  lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
 151  /* make sure mmap accepts it */
 152  ((char*)lpDosTask->img)[0x10FFFF]=0;
 153 #else
 154  tmpnam(lpDosTask->mm_name);
 155 /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */
 156  lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
 157  if (lpDosTask->mm_fd<0) ERR(module,"file %s could not be opened\n",lpDosTask->mm_name);
 158  /* expand file to 1MB+64K */
 159  lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET);
 160  x=0; write(lpDosTask->mm_fd,&x,1);
 161  /* map it in */
 162  lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0);
 163 #endif
 164  if (lpDosTask->img==(LPVOID)-1) {
 165   ERR(module,"could not map shared memory, error=%s\n",strerror(errno));
 166   return 0;
 167  }
 168  TRACE(module,"DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
 169  pModule->dos_image=lpDosTask->img;
 170
 171  /* initialize the memory */
 172  TRACE(module,"Initializing DOS memory structures\n");
 173  DOSMEM_Init(lpDosTask->hModule);
 174  MZ_InitXMS(lpDosTask);
 175  MZ_InitDPMI(lpDosTask);
 176  return 32;
 177 }
 178
 179 static int MZ_LoadImage( HFILE16 hFile, LPCSTR name, LPCSTR cmdline,
 180                          LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
 181 {
 182  IMAGE_DOS_HEADER mz_header;
 183  DWORD image_start,image_size,min_size,max_size,avail;
 184  BYTE*psp_start,*load_start;
 185  int x,old_com=0;
 186  SEGPTR reloc;
 187  WORD env_seg;
 188
 189  if ((_hread16(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) ||
 190      (mz_header.e_magic != IMAGE_DOS_SIGNATURE)) {
 191 #if 0
 192      return 11; /* invalid exe */
 193 #endif
 194   old_com=1; /* assume .COM file */
 195   image_start=0;
 196   image_size=GetFileSize(HFILE16_TO_HFILE32(hFile),NULL);
 197   min_size=0x10000; max_size=0x100000;
 198   mz_header.e_crlc=0;
 199   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 200   mz_header.e_cs=0; mz_header.e_ip=0x100;
 201  } else {
 202   /* calculate load size */
 203   image_start=mz_header.e_cparhdr<<4;
 204   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 205   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 206   image_size-=image_start;
 207   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 208   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 209  }
 210
 211  MZ_InitMemory(lpDosTask,pModule);
 212
 213  /* allocate environment block */
 214  env_seg=MZ_InitEnvironment(lpDosTask,env,name);
 215
 216  /* allocate memory for the executable */
 217  TRACE(module,"Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 218  avail=DOSMEM_Available(lpDosTask->hModule);
 219  if (avail<min_size) {
 220   ERR(module, "insufficient DOS memory\n");
 221   return 0;
 222  }
 223  if (avail>max_size) avail=max_size;
 224  psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
 225  if (!psp_start) {
 226   ERR(module, "error allocating DOS memory\n");
 227   return 0;
 228  }
 229  lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
 230  load_start=psp_start+(PSP_SIZE<<4);
 231  MZ_InitPSP(psp_start, cmdline, env_seg);
 232
 233  /* load executable image */
 234  TRACE(module,"loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 235  _llseek16(hFile,image_start,FILE_BEGIN);
 236  if ((_hread16(hFile,load_start,image_size)) != image_size)
 237   return 11; /* invalid exe */
 238
 239  if (mz_header.e_crlc) {
 240   /* load relocation table */
 241   TRACE(module,"loading DOS EXE relocation table, %d entries\n",mz_header.e_lfarlc);
 242   /* FIXME: is this too slow without read buffering? */
 243   _llseek16(hFile,mz_header.e_lfarlc,FILE_BEGIN);
 244   for (x=0; x<mz_header.e_crlc; x++) {
 245    if (_lread16(hFile,&reloc,sizeof(reloc)) != sizeof(reloc))
 246     return 11; /* invalid exe */
 247    *(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
 248   }
 249  }
 250
 251  lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
 252  lpDosTask->init_ip=mz_header.e_ip;
 253  lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
 254  lpDosTask->init_sp=mz_header.e_sp;
 255
 256  TRACE(module,"entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
 257
 258  return 32;
 259 }
 260
 261 int MZ_InitTask( LPDOSTASK lpDosTask )
 262 {
 263  int read_fd[2],write_fd[2];
 264  pid_t child;
 265  char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
 266
 267  /* create read pipe */
 268  if (pipe(read_fd)<0) return 0;
 269  if (pipe(write_fd)<0) {
 270   close(read_fd[0]); close(read_fd[1]); return 0;
 271  }
 272  lpDosTask->read_pipe=read_fd[0];
 273  lpDosTask->write_pipe=write_fd[1];
 274  /* if we have a mapping file, use it */
 275  fname=lpDosTask->mm_name; farg=NULL;
 276  if (!fname[0]) {
 277   /* otherwise, map our own memory image */
 278   sprintf(fproc,"/proc/%d/mem",getpid());
 279   sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
 280   fname=fproc; farg=arg;
 281  }
 282
 283  TRACE(module,"Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
 284  if ((child=fork())<0) {
 285   close(write_fd[0]); close(write_fd[1]);
 286   close(read_fd[0]); close(read_fd[1]); return 0;
 287  }
 288  if (child!=0) {
 289   /* parent process */
 290   int ret;
 291
 292   close(read_fd[1]); close(write_fd[0]);
 293   lpDosTask->task=child;
 294   /* wait for child process to signal readiness */
 295   do {
 296    if (read(lpDosTask->read_pipe,&ret,sizeof(ret))!=sizeof(ret)) {
 297     if ((errno==EINTR)||(errno==EAGAIN)) continue;
 298     /* failure */
 299     ERR(module,"dosmod has failed to initialize\n");
 300     if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 301     return 0;
 302    }
 303   } while (0);
 304   /* the child has now mmaped the temp file, it's now safe to unlink.
 305    * do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
 306   if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 307   /* all systems are now go */
 308  } else {
 309   /* child process */
 310   close(read_fd[0]); close(write_fd[1]);
 311   /* put our pipes somewhere dosmod can find them */
 312   dup2(write_fd[0],0);      /* stdin */
 313   dup2(read_fd[1],1);       /* stdout */
 314   /* now load dosmod */
 315   execlp("dosmod",fname,farg,NULL);
 316   execl("dosmod",fname,farg,NULL);
 317   /* hmm, they didn't install properly */
 318   execl("loader/dos/dosmod",fname,farg,NULL);
 319   /* last resort, try to find it through argv[0] */
 320   fpath=strrchr(strcpy(path,Options.argv0),'/');
 321   if (fpath) {
 322    strcpy(fpath,"/loader/dos/dosmod");
 323    execl(path,fname,farg,NULL);
 324   }
 325   /* if failure, exit */
 326   ERR(module,"Failed to spawn dosmod, error=%s\n",strerror(errno));
 327   exit(1);
 328  }
 329  return 32;
 330 }
 331
 332 HINSTANCE16 MZ_CreateProcess( LPCSTR name, LPCSTR cmdline, LPCSTR env,
 333                               LPSTARTUPINFO32A startup, LPPROCESS_INFORMATION info )
 334 {
 335  LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
 336  HMODULE16 hModule;
 337  HINSTANCE16 hInstance;
 338  TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
 339  NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 340  HFILE16 hFile;
 341  OFSTRUCT ofs;
 342  int err, alloc = !(pModule && pModule->dos_image);
 343
 344  GlobalUnlock16( GetCurrentTask() );
 345
 346  if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL)
 347   return 0;
 348
 349  if ((hFile = OpenFile16( name, &ofs, OF_READ )) == HFILE_ERROR16)
 350   return 2; /* File not found */
 351
 352  if (alloc) {
 353   if ((hModule = MODULE_CreateDummyModule(&ofs)) < 32)
 354    return hModule;
 355
 356   lpDosTask->hModule = hModule;
 357
 358   pModule = (NE_MODULE *)GlobalLock16(hModule);
 359   pModule->lpDosTask = lpDosTask;
 360
 361   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 362  } else lpDosTask=pModule->lpDosTask;
 363  err = MZ_LoadImage( hFile, name, cmdline, env, lpDosTask, pModule );
 364  _lclose16(hFile);
 365  if (alloc) {
 366   pModule->dos_image = lpDosTask->img;
 367   if (err<32) {
 368    if (lpDosTask->mm_name[0]!=0) {
 369     if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
 370     if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
 371     unlink(lpDosTask->mm_name);
 372    } else
 373     if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 374    return err;
 375   }
 376   err = MZ_InitTask( lpDosTask );
 377   if (err<32) {
 378    MZ_KillModule( lpDosTask );
 379    /* FIXME: cleanup hModule */
 380    return err;
 381   }
 382
 383   hInstance = NE_CreateInstance(pModule, NULL, (cmdline == NULL));
 384   PROCESS_Create( pModule, cmdline, env, hInstance, 0, startup, info );
 385   return hInstance;
 386  } else {
 387   return (err<32) ? err : pTask->hInstance;
 388  }
 389 }
 390
 391 void MZ_KillModule( LPDOSTASK lpDosTask )
 392 {
 393  if (lpDosTask->mm_name[0]!=0) {
 394   munmap(lpDosTask->img,0x110000-START_OFFSET);
 395   close(lpDosTask->mm_fd);
 396  } else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 397  close(lpDosTask->read_pipe);
 398  close(lpDosTask->write_pipe);
 399  kill(lpDosTask->task,SIGTERM);
 400 #if 0
 401  /* FIXME: this seems to crash */
 402  if (lpDosTask->dpmi_sel)
 403   UnMapLS(PTR_SEG_OFF_TO_SEGPTR(lpDosTask->dpmi_sel,0));
 404 #endif
 405 }
 406
 407 #else /* !MZ_SUPPORTED */
 408
 409 HINSTANCE16 MZ_CreateProcess( LPCSTR name, LPCSTR cmdline, LPCSTR env,
 410                               LPSTARTUPINFO32A startup, LPPROCESS_INFORMATION info )
 411 {
 412  WARN(module,"DOS executables not supported on this architecture\n");
 413  return (HMODULE16)11;  /* invalid exe */
 414 }
 415
 416 #endif