loader/ne_image.c

   1 #ifndef WINELIB
   2 /*
   3  * NE modules
   4  *
   5  * Copyright 1993 Robert J. Amstadt
   6  * Copyright 1995 Alexandre Julliard
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <unistd.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17 #include <errno.h>
  18 #include "neexe.h"
  19 #include "dlls.h"
  20 #include "windows.h"
  21 #include "arch.h"
  22 #include "selectors.h"
  23 #include "callback.h"
  24 #include "module.h"
  25 #include "stackframe.h"
  26 #include "stddebug.h"
  27 #include "debug.h"
  28 #include "xmalloc.h"
  29
  30
  31 /***********************************************************************
  32  *           NE_LoadSegment
  33  */
  34 BOOL NE_LoadSegment( HMODULE hModule, WORD segnum )
  35 {
  36     NE_MODULE *pModule;
  37     SEGTABLEENTRY *pSegTable, *pSeg;
  38     WORD *pModuleTable;
  39     WORD count, i, offset;
  40     HMODULE module;
  41     DWORD address;
  42     int fd;
  43     struct relocation_entry_s *rep, *reloc_entries;
  44     BYTE *func_name;
  45     int size;
  46     char* mem;
  47
  48     char buffer[100];
  49     int ordinal, additive;
  50     unsigned short *sp;
  51
  52     if (!(pModule = (NE_MODULE *)GlobalLock( hModule ))) return FALSE;
  53     pSegTable = NE_SEG_TABLE( pModule );
  54     pSeg = pSegTable + segnum - 1;
  55     pModuleTable = NE_MODULE_TABLE( pModule );
  56
  57     if (!pSeg->filepos) return TRUE;  /* No file image, just return */
  58
  59     fd = MODULE_OpenFile( hModule );
  60     dprintf_module( stddeb, "Loading segment %d, selector="NPFMT"\n",
  61                     segnum, pSeg->selector );
  62     lseek( fd, pSeg->filepos << pModule->alignment, SEEK_SET );
  63     size = pSeg->size ? pSeg->size : 0x10000;
  64     mem = GlobalLock(pSeg->selector);
  65     if (pModule->flags & NE_FFLAGS_SELFLOAD && segnum > 1) {
  66 #ifndef WINELIB
  67         /* Implement self loading segments */
  68         SELFLOADHEADER *selfloadheader;
  69         WORD oldss, oldsp, oldselector, newselector;
  70         selfloadheader = (SELFLOADHEADER *)
  71                 PTR_SEG_OFF_TO_LIN(pSegTable->selector,0);
  72         oldss = IF1632_Saved16_ss;
  73         oldsp = IF1632_Saved16_sp;
  74         oldselector = pSeg->selector;
  75         IF1632_Saved16_ss = pModule->self_loading_sel;
  76         IF1632_Saved16_sp = 0xFF00;
  77         newselector =  CallTo16_word_www(selfloadheader->LoadAppSeg,
  78                 pModule->self_loading_sel, hModule, fd, segnum);
  79         if (newselector != oldselector) {
  80           /* Self loaders like creating their own selectors;
  81            * they love asking for trouble to Wine developers
  82            */
  83           if (segnum == pModule->dgroup) {
  84             memcpy(PTR_SEG_OFF_TO_LIN(oldselector,0),
  85                    PTR_SEG_OFF_TO_LIN(newselector,0),
  86                    pSeg->minsize ? pSeg->minsize : 0x10000);
  87             FreeSelector(newselector);
  88             pSeg->selector = oldselector;
  89             fprintf(stderr, "A new selector was allocated for the dgroup segment\n"
  90                     "Old selector is %d, new one is %d", oldselector, newselector);
  91           } else {
  92             FreeSelector(pSeg->selector);
  93             pSeg->selector = newselector;
  94           }
  95         }
  96
  97         IF1632_Saved16_ss = oldss;
  98         IF1632_Saved16_sp = oldsp;
  99 #else
 100         fprintf(stderr,"JBP: Ignoring self loading segments in NE_LoadSegment.\n");
 101 #endif
 102      }
 103     else if (!(pSeg->flags & NE_SEGFLAGS_ITERATED))
 104       read(fd, mem, size);
 105     else {
 106       /*
 107          The following bit of code for "iterated segments" was written without
 108          any documentation on the format of these segments. It seems to work,
 109          but may be missing something. If you have any doco please either send
 110          it to me or fix the code yourself. gfm@werple.mira.net.au
 111       */
 112       char* buff = xmalloc(size);
 113       char* curr = buff;
 114       read(fd, buff, size);
 115       while(curr < buff + size) {
 116         unsigned int rept = *((short*) curr)++;
 117         unsigned int len = *((short*) curr)++;
 118         for(; rept > 0; rept--) {
 119           char* bytes = curr;
 120           unsigned int byte;
 121           for(byte = 0; byte < len; byte++)
 122             *mem++ = *bytes++;
 123         }
 124         curr += len;
 125       }
 126       free(buff);
 127     }
 128
 129     pSeg->flags |= NE_SEGFLAGS_LOADED;
 130     if (!(pSeg->flags & NE_SEGFLAGS_RELOC_DATA))
 131         return TRUE;  /* No relocation data, we are done */
 132
 133     read( fd, &count, sizeof(count) );
 134     if (!count) return TRUE;
 135
 136     dprintf_fixup( stddeb, "Fixups for %*.*s, segment %d, selector "NPFMT"\n",
 137                    *((BYTE *)pModule + pModule->name_table),
 138                    *((BYTE *)pModule + pModule->name_table),
 139                    (char *)pModule + pModule->name_table + 1,
 140                    segnum, pSeg->selector );
 141
 142     reloc_entries = (struct relocation_entry_s *)xmalloc(count * sizeof(struct relocation_entry_s));
 143     if (read( fd, reloc_entries, count * sizeof(struct relocation_entry_s)) !=
 144             count * sizeof(struct relocation_entry_s))
 145     {
 146         dprintf_fixup( stddeb, "Unable to read relocation information\n" );
 147         return FALSE;
 148     }
 149
 150     /*
 151      * Go through the relocation table on entry at a time.
 152      */
 153     rep = reloc_entries;
 154     for (i = 0; i < count; i++, rep++)
 155     {
 156         /*
 157          * Get the target address corresponding to this entry.
 158          */
 159
 160         /* If additive, there is no target chain list. Instead, add source
 161            and target */
 162         additive = rep->relocation_type & NE_RELFLAG_ADDITIVE;
 163         rep->relocation_type &= 0x3;
 164
 165         switch (rep->relocation_type)
 166         {
 167           case NE_RELTYPE_ORDINAL:
 168             module = pModuleTable[rep->target1-1];
 169             ordinal = rep->target2;
 170             address = MODULE_GetEntryPoint( module, ordinal );
 171             if (!address)
 172             {
 173                 NE_MODULE *pTarget = (NE_MODULE *)GlobalLock( module );
 174                 if (!pTarget)
 175                     fprintf( stderr, "Module not found: "NPFMT", reference %d of module %*.*s\n",
 176                              module, rep->target1,
 177                              *((BYTE *)pModule + pModule->name_table),
 178                              *((BYTE *)pModule + pModule->name_table),
 179                              (char *)pModule + pModule->name_table + 1 );
 180                 else
 181                     fprintf( stderr, "Warning: no handler for %*.*s.%d, setting to 0:0\n",
 182                             *((BYTE *)pTarget + pTarget->name_table),
 183                             *((BYTE *)pTarget + pTarget->name_table),
 184                             (char *)pTarget + pTarget->name_table + 1,
 185                             ordinal );
 186             }
 187             if (debugging_fixup)
 188             {
 189                 NE_MODULE *pTarget = (NE_MODULE *)GlobalLock( module );
 190                 fprintf( stddeb,"%d: %*.*s.%d=%04x:%04x\n", i + 1,
 191                          *((BYTE *)pTarget + pTarget->name_table),
 192                          *((BYTE *)pTarget + pTarget->name_table),
 193                          (char *)pTarget + pTarget->name_table + 1,
 194                          ordinal, HIWORD(address), LOWORD(address) );
 195             }
 196             break;
 197
 198           case NE_RELTYPE_NAME:
 199             module = pModuleTable[rep->target1-1];
 200             func_name = (char *)pModule + pModule->import_table + rep->target2;
 201             memcpy( buffer, func_name+1, *func_name );
 202             buffer[*func_name] = '\0';
 203             func_name = buffer;
 204             ordinal = MODULE_GetOrdinal( module, func_name );
 205
 206             address = MODULE_GetEntryPoint( module, ordinal );
 207
 208             if (!address)
 209             {
 210                 NE_MODULE *pTarget = (NE_MODULE *)GlobalLock( module );
 211                 fprintf( stderr, "Warning: no handler for %*.*s.%s, setting to 0:0\n",
 212                         *((BYTE *)pTarget + pTarget->name_table),
 213                         *((BYTE *)pTarget + pTarget->name_table),
 214                         (char *)pTarget + pTarget->name_table + 1, func_name );
 215             }
 216             if (debugging_fixup)
 217             {
 218                 NE_MODULE *pTarget = (NE_MODULE *)GlobalLock( module );
 219                 fprintf( stddeb,"%d: %*.*s.%s=%04x:%04x\n", i + 1,
 220                          *((BYTE *)pTarget + pTarget->name_table),
 221                          *((BYTE *)pTarget + pTarget->name_table),
 222                          (char *)pTarget + pTarget->name_table + 1,
 223                          func_name, HIWORD(address), LOWORD(address) );
 224             }
 225             break;
 226
 227           case NE_RELTYPE_INTERNAL:
 228             if (rep->target1 == 0x00ff)
 229             {
 230                 address  = MODULE_GetEntryPoint( hModule, rep->target2 );
 231             }
 232             else
 233             {
 234                 address = MAKELONG( rep->target2, pSegTable[rep->target1-1].selector );
 235             }
 236
 237             dprintf_fixup(stddeb,"%d: %04x:%04x\n",
 238                           i + 1, HIWORD(address), LOWORD(address) );
 239             break;
 240
 241           case NE_RELTYPE_OSFIXUP:
 242             /* Relocation type 7:
 243              *
 244              *    These appear to be used as fixups for the Windows
 245              * floating point emulator.  Let's just ignore them and
 246              * try to use the hardware floating point.  Linux should
 247              * successfully emulate the coprocessor if it doesn't
 248              * exist.
 249              */
 250             dprintf_fixup(stddeb,
 251                    "%d: ADDR TYPE %d,  TYPE %d,  OFFSET %04x,  ",
 252                    i + 1, rep->address_type, rep->relocation_type,
 253                    rep->offset);
 254             dprintf_fixup(stddeb,"TARGET %04x %04x\n",
 255                    rep->target1, rep->target2);
 256             continue;
 257
 258           default:
 259             dprintf_fixup(stddeb,
 260                    "%d: ADDR TYPE %d,  TYPE %d,  OFFSET %04x,  ",
 261                    i + 1, rep->address_type, rep->relocation_type,
 262                    rep->offset);
 263             dprintf_fixup(stddeb,"TARGET %04x %04x\n",
 264                     rep->target1, rep->target2);
 265             free(reloc_entries);
 266             return FALSE;
 267         }
 268
 269         offset  = rep->offset;
 270
 271         switch (rep->address_type)
 272         {
 273           case NE_RADDR_LOWBYTE:
 274             do {
 275                 sp = PTR_SEG_OFF_TO_LIN( pSeg->selector, offset );
 276                 dprintf_fixup(stddeb,"    "NPFMT":%04x:%04x BYTE%s\n",
 277                               pSeg->selector, offset, *sp, additive ? " additive":"");
 278                 offset = *sp;
 279                 if(additive)
 280                     *(unsigned char*)sp = (unsigned char)((address+offset) & 0xFF);
 281                 else
 282                     *(unsigned char*)sp = (unsigned char)(address & 0xFF);
 283             }
 284             while (offset != 0xffff && !additive);
 285             break;
 286
 287           case NE_RADDR_OFFSET16:
 288             do {
 289                 sp = PTR_SEG_OFF_TO_LIN( pSeg->selector, offset );
 290                 dprintf_fixup(stddeb,"    "NPFMT":%04x:%04x OFFSET16%s\n",
 291                               pSeg->selector, offset, *sp, additive ? " additive" : "" );
 292                 offset = *sp;
 293                 *sp = LOWORD(address);
 294                 if (additive) *sp += offset;
 295             }
 296             while (offset != 0xffff && !additive);
 297             break;
 298
 299           case NE_RADDR_POINTER32:
 300             do {
 301                 sp = PTR_SEG_OFF_TO_LIN( pSeg->selector, offset );
 302                 dprintf_fixup(stddeb,"    "NPFMT":%04x:%04x POINTER32%s\n",
 303                               pSeg->selector, offset, *sp, additive ? " additive" : "" );
 304                 offset = *sp;
 305                 *sp    = LOWORD(address);
 306                 if (additive) *sp += offset;
 307                 *(sp+1) = HIWORD(address);
 308             }
 309             while (offset != 0xffff && !additive);
 310             break;
 311
 312           case NE_RADDR_SELECTOR:
 313             do {
 314                 sp = PTR_SEG_OFF_TO_LIN( pSeg->selector, offset );
 315                 dprintf_fixup(stddeb,"    "NPFMT":%04x:%04x SELECTOR%s\n",
 316                               pSeg->selector, offset, *sp, additive ? " additive" : "" );
 317                 offset = *sp;
 318                 *sp    = HIWORD(address);
 319                 /* Borland creates additive records with offset zero. Strange, but OK */
 320                 if(additive && offset)
 321                 fprintf(stderr,"Additive selector to %4.4x.Please report\n",offset);
 322             }
 323             while (offset != 0xffff && !additive);
 324             break;
 325
 326           default:
 327             dprintf_fixup(stddeb,
 328                    "%d: ADDR TYPE %d,  TYPE %d,  OFFSET %04x,  ",
 329                    i + 1, rep->address_type, rep->relocation_type,
 330                    rep->offset);
 331             dprintf_fixup(stddeb,
 332                    "TARGET %04x %04x\n", rep->target1, rep->target2);
 333             free(reloc_entries);
 334             return FALSE;
 335         }
 336     }
 337
 338     free(reloc_entries);
 339     return TRUE;
 340 }
 341
 342
 343 /***********************************************************************
 344  *           NE_FixupPrologs
 345  *
 346  * Fixup the exported functions prologs.
 347  */
 348 void NE_FixupPrologs( HMODULE hModule )
 349 {
 350 #ifdef WINELIB
 351         fprintf(stderr,"NE_FixupPrologs should not be called for libwine\n");
 352 #else
 353     NE_MODULE *pModule;
 354     SEGTABLEENTRY *pSegTable;
 355     WORD dgroup = 0;
 356     WORD sel;
 357     BYTE *p, *fixup_ptr, count;
 358
 359     pModule = (NE_MODULE *)GlobalLock( hModule );
 360     pSegTable = NE_SEG_TABLE(pModule);
 361     if (pModule->flags & NE_FFLAGS_SINGLEDATA)
 362         dgroup = pSegTable[pModule->dgroup-1].selector;
 363
 364     dprintf_module( stddeb, "MODULE_FixupPrologs(%04x)\n", hModule );
 365     p = (BYTE *)pModule + pModule->entry_table;
 366     while (*p)
 367     {
 368         if (p[1] == 0)  /* Unused entry */
 369         {
 370             p += 2;  /* Skip it */
 371             continue;
 372         }
 373         if (p[1] == 0xfe)  /* Constant entry */
 374         {
 375             p += 2 + *p * 3;  /* Skip it */
 376             continue;
 377         }
 378
 379         /* Now fixup the entries of this bundle */
 380         count = *p;
 381         sel = p[1];
 382         p += 2;
 383         while (count-- > 0)
 384         {
 385             dprintf_module( stddeb,"Flags: %04x, sel %02x ", *p, sel);
 386             /* According to the output generated by TDUMP, the flags mean:
 387              * 0x0001 function is exported
 388              * 0x0002 Single data (seems to occur only in DLLs)
 389              */
 390             if (sel == 0xff) { /* moveable */
 391                 dprintf_module( stddeb, "(%02x) o %04x ", p[3], *(WORD *)(p+4) );
 392                 fixup_ptr = (char *)GET_SEL_BASE(pSegTable[p[3]-1].selector) + *(WORD *)(p + 4);
 393             } else { /* fixed */
 394                 dprintf_module( stddeb, "offset %04x ", *(WORD *)(p+1) );
 395                 fixup_ptr = (char *)GET_SEL_BASE(pSegTable[sel-1].selector) + *(WORD *)(p + 1);
 396             }
 397             dprintf_module( stddeb, "Signature: %02x %02x %02x,ff %x\n",
 398                            fixup_ptr[0], fixup_ptr[1], fixup_ptr[2],
 399                            pModule->flags );
 400             if (*p & 0x0001)
 401             {
 402                 /* Verify the signature */
 403                 if (((fixup_ptr[0] == 0x1e && fixup_ptr[1] == 0x58)
 404                      || (fixup_ptr[0] == 0x8c && fixup_ptr[1] == 0xd8))
 405                     && fixup_ptr[2] == 0x90)
 406                 {
 407                     if (*p & 0x0002)
 408                     {
 409                         if (pModule->flags & NE_FFLAGS_MULTIPLEDATA) {
 410                             /* can this happen? */
 411                             fprintf( stderr, "FixupPrologs got confused\n" );
 412                         }
 413                         *fixup_ptr = 0xb8;      /* MOV AX, */
 414                         *(WORD *)(fixup_ptr+1) = dgroup;
 415                     }
 416                     else
 417                     {
 418                         if (pModule->flags & NE_FFLAGS_MULTIPLEDATA) {
 419                             fixup_ptr[0] = 0x90; /* non-library: NOPs */
 420                             fixup_ptr[1] = 0x90;
 421                             fixup_ptr[2] = 0x90;
 422                         }
 423                     }
 424                 } else {
 425                     dprintf_fixup( stddeb, "Unknown signature\n" );
 426                 }
 427             }
 428             else
 429               dprintf_module( stddeb,"\n");
 430             p += (sel == 0xff) ? 6 : 3;
 431         }
 432     }
 433 #endif
 434 }
 435
 436
 437 /***********************************************************************
 438  *           NE_InitDLL
 439  *
 440  * Call the DLL initialization code
 441  */
 442 static BOOL NE_InitDLL( HMODULE hModule )
 443 {
 444 #ifndef WINELIB
 445     int cs_reg, ds_reg, ip_reg, cx_reg, di_reg, bp_reg;
 446     NE_MODULE *pModule;
 447     SEGTABLEENTRY *pSegTable;
 448
 449     /* Registers at initialization must be:
 450      * cx     heap size
 451      * di     library instance
 452      * ds     data segment if any
 453      * es:si  command line (always 0)
 454      */
 455
 456     pModule = (NE_MODULE *)GlobalLock( hModule );
 457     pSegTable = NE_SEG_TABLE( pModule );
 458
 459     if (!(pModule->flags & NE_FFLAGS_LIBMODULE)) return TRUE; /*not a library*/
 460     if (!pModule->cs) return TRUE;  /* no initialization code */
 461
 462     if (!(pModule->flags & NE_FFLAGS_SINGLEDATA))
 463     {
 464         if (pModule->flags & NE_FFLAGS_MULTIPLEDATA || pModule->dgroup)
 465         {
 466             /* Not SINGLEDATA */
 467             fprintf(stderr, "Library is not marked SINGLEDATA\n");
 468             exit(1);
 469         }
 470         else  /* DATA NONE DLL */
 471         {
 472             ds_reg = 0;
 473             cx_reg = 0;
 474         }
 475     }
 476     else  /* DATA SINGLE DLL */
 477     {
 478         ds_reg = pSegTable[pModule->dgroup-1].selector;
 479         cx_reg = pModule->heap_size;
 480     }
 481
 482     cs_reg = pSegTable[pModule->cs-1].selector;
 483     ip_reg = pModule->ip;
 484     di_reg = ds_reg ? ds_reg : hModule;
 485     bp_reg = IF1632_Saved16_sp + ((WORD)&((STACK16FRAME*)1)->bp - 1);
 486
 487     pModule->cs = 0;  /* Don't initialize it twice */
 488     dprintf_dll( stddeb, "Calling LibMain, cs:ip=%04x:%04x ds=%04x di=%04x cx=%04x\n",
 489                  cs_reg, ip_reg, ds_reg, di_reg, cx_reg );
 490     return CallTo16_regs_( (FARPROC)(cs_reg << 16 | ip_reg), ds_reg,
 491                            0 /*es*/, 0 /*bp*/, 0 /*ax*/, 0 /*bx*/,
 492                            cx_reg, 0 /*dx*/, 0 /*si*/, di_reg );
 493 #else
 494     fprintf( stderr,"JBP: Ignoring call to LibMain\n" );
 495     return FALSE;
 496 #endif
 497 }
 498
 499
 500 /***********************************************************************
 501  *           NE_InitializeDLLs
 502  *
 503  * Initialize the loaded DLLs.
 504  */
 505 void NE_InitializeDLLs( HMODULE hModule )
 506 {
 507     NE_MODULE *pModule;
 508     HMODULE *pDLL;
 509
 510     pModule = (NE_MODULE *)GlobalLock( hModule );
 511     if (pModule->dlls_to_init)
 512     {
 513         HANDLE to_init = pModule->dlls_to_init;
 514         pModule->dlls_to_init = 0;
 515         for (pDLL = (HMODULE *)GlobalLock( to_init ); *pDLL; pDLL++)
 516         {
 517             NE_InitializeDLLs( *pDLL );
 518             NE_InitDLL( *pDLL );
 519         }
 520         GlobalFree( to_init );
 521     }
 522     NE_InitDLL( hModule );
 523 }
 524
 525
 526 /***********************************************************************
 527  *           NE_PatchCodeHandle
 528  *
 529  * Needed for self-loading modules.
 530  */
 531
 532 /* It does nothing */
 533 void PatchCodeHandle(HANDLE hSel)
 534 {
 535 }
 536 #endif /* WINELIB */