memory/selector.c

   1 /*
   2  * Selector manipulation functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <string.h>
   8 #include "windows.h"
   9 #include "ldt.h"
  10 #include "miscemu.h"
  11 #include "selectors.h"
  12 #include "stackframe.h"
  13 #include "debug.h"
  14
  15
  16 /***********************************************************************
  17  *           AllocSelectorArray   (KERNEL.206)
  18  */
  19 WORD WINAPI AllocSelectorArray( WORD count )
  20 {
  21     WORD i, sel, size = 0;
  22     ldt_entry entry;
  23
  24     if (!count) return 0;
  25     for (i = FIRST_LDT_ENTRY_TO_ALLOC; i < LDT_SIZE; i++)
  26     {
  27         if (!IS_LDT_ENTRY_FREE(i)) size = 0;
  28         else if (++size >= count) break;
  29     }
  30     if (i == LDT_SIZE) return 0;
  31     sel = i - size + 1;
  32
  33     entry.base           = 0;
  34     entry.type           = SEGMENT_DATA;
  35     entry.seg_32bit      = FALSE;
  36     entry.read_only      = FALSE;
  37     entry.limit_in_pages = FALSE;
  38     entry.limit          = 1;  /* avoid 0 base and limit */
  39
  40     for (i = 0; i < count; i++)
  41     {
  42         /* Mark selector as allocated */
  43         ldt_flags_copy[sel + i] |= LDT_FLAGS_ALLOCATED;
  44         LDT_SetEntry( sel + i, &entry );
  45     }
  46     return ENTRY_TO_SELECTOR( sel );
  47 }
  48
  49
  50 /***********************************************************************
  51  *           AllocSelector   (KERNEL.175)
  52  */
  53 WORD WINAPI AllocSelector( WORD sel )
  54 {
  55     WORD newsel, count, i;
  56
  57     count = sel ? ((GET_SEL_LIMIT(sel) >> 16) + 1) : 1;
  58     newsel = AllocSelectorArray( count );
  59     TRACE(selector, "(%04x): returning %04x\n",
  60                       sel, newsel );
  61     if (!newsel) return 0;
  62     if (!sel) return newsel;  /* nothing to copy */
  63     for (i = 0; i < count; i++)
  64     {
  65         ldt_entry entry;
  66         LDT_GetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
  67         LDT_SetEntry( SELECTOR_TO_ENTRY(newsel) + i, &entry );
  68     }
  69     return newsel;
  70 }
  71
  72
  73 /***********************************************************************
  74  *           FreeSelector   (KERNEL.176)
  75  */
  76 WORD WINAPI FreeSelector( WORD sel )
  77 {
  78     if (IS_SELECTOR_FREE(sel)) return sel;  /* error */
  79     SELECTOR_FreeBlock( sel, 1 );
  80     return 0;
  81 }
  82
  83
  84 /***********************************************************************
  85  *           SELECTOR_SetEntries
  86  *
  87  * Set the LDT entries for an array of selectors.
  88  */
  89 static void SELECTOR_SetEntries( WORD sel, const void *base, DWORD size,
  90                                  enum seg_type type, BOOL32 is32bit,
  91                                  BOOL32 readonly )
  92 {
  93     ldt_entry entry;
  94     WORD i, count;
  95
  96     /* The limit for the first selector is the whole */
  97     /* block. The next selectors get a 64k limit.    */
  98     entry.base           = (unsigned long)base;
  99     entry.type           = type;
 100     entry.seg_32bit      = is32bit;
 101     entry.read_only      = readonly;
 102     entry.limit_in_pages = (size > 0x100000);
 103     if (entry.limit_in_pages) entry.limit = ((size + 0xfff) >> 12) - 1;
 104     else entry.limit = size - 1;
 105     /* Make sure base and limit are not 0 together if the size is not 0 */
 106     if (!base && !entry.limit && size) entry.limit = 1;
 107     count = (size + 0xffff) / 0x10000;
 108     for (i = 0; i < count; i++)
 109     {
 110         LDT_SetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 111         entry.base += 0x10000;
 112         /* Apparently the next selectors should *not* get a 64k limit. */
 113         /* Can't remember where I read they should... --AJ */
 114         entry.limit -= entry.limit_in_pages ? 0x10 : 0x10000;
 115     }
 116 }
 117
 118
 119 /***********************************************************************
 120  *           SELECTOR_AllocBlock
 121  *
 122  * Allocate selectors for a block of linear memory.
 123  */
 124 WORD SELECTOR_AllocBlock( const void *base, DWORD size, enum seg_type type,
 125                           BOOL32 is32bit, BOOL32 readonly )
 126 {
 127     WORD sel, count;
 128
 129     if (!size) return 0;
 130     count = (size + 0xffff) / 0x10000;
 131     sel = AllocSelectorArray( count );
 132     if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
 133     return sel;
 134 }
 135
 136
 137 /***********************************************************************
 138  *           SELECTOR_MoveBlock
 139  *
 140  * Move a block of selectors in linear memory.
 141  */
 142 void SELECTOR_MoveBlock( WORD sel, const void *new_base )
 143 {
 144     WORD i, count = (GET_SEL_LIMIT(sel) >> 16) + 1;
 145
 146     for (i = 0; i < count; i++)
 147     {
 148         ldt_entry entry;
 149         LDT_GetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 150         entry.base = (unsigned long)new_base;
 151         LDT_SetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 152     }
 153 }
 154
 155
 156 /***********************************************************************
 157  *           SELECTOR_FreeBlock
 158  *
 159  * Free a block of selectors.
 160  */
 161 void SELECTOR_FreeBlock( WORD sel, WORD count )
 162 {
 163     WORD i, nextsel;
 164     ldt_entry entry;
 165     STACK16FRAME *frame;
 166
 167     TRACE(selector, "(%04x,%d)\n", sel, count );
 168     sel &= ~(__AHINCR - 1);  /* clear bottom bits of selector */
 169     nextsel = sel + (count << __AHSHIFT);
 170
 171 #ifdef __i386__
 172     {
 173         /* Check if we are freeing current %fs or %gs selector */
 174
 175         WORD fs, gs;
 176         GET_FS(fs);
 177         if ((fs >= sel) && (fs < nextsel))
 178         {
 179             WARN(selector, "Freeing %%fs selector (%04x), not good.\n", fs );
 180             SET_FS( 0 );
 181         }
 182         GET_GS(gs);
 183         if ((gs >= sel) && (gs < nextsel)) SET_GS( 0 );
 184     }
 185 #endif  /* __i386__ */
 186
 187     memset( &entry, 0, sizeof(entry) );  /* clear the LDT entries */
 188     for (i = SELECTOR_TO_ENTRY(sel); count; i++, count--)
 189     {
 190         LDT_SetEntry( i, &entry );
 191         ldt_flags_copy[i] &= ~LDT_FLAGS_ALLOCATED;
 192     }
 193
 194     /* Clear the saved 16-bit selector */
 195     frame = CURRENT_STACK16;
 196     while (frame && frame->frame32)
 197     {
 198         if ((frame->ds >= sel) && (frame->ds < nextsel)) frame->ds = 0;
 199         if ((frame->es >= sel) && (frame->es < nextsel)) frame->es = 0;
 200         frame = PTR_SEG_TO_LIN( frame->frame32->frame16 );
 201     }
 202 }
 203
 204
 205 /***********************************************************************
 206  *           SELECTOR_ReallocBlock
 207  *
 208  * Change the size of a block of selectors.
 209  */
 210 WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size,
 211                            enum seg_type type, BOOL32 is32bit, BOOL32 readonly)
 212 {
 213     WORD i, oldcount, newcount;
 214
 215     if (!size) size = 1;
 216     oldcount = (GET_SEL_LIMIT(sel) >> 16) + 1;
 217     newcount = (size + 0xffff) >> 16;
 218
 219     if (oldcount < newcount)  /* We need to add selectors */
 220     {
 221           /* Check if the next selectors are free */
 222         if (SELECTOR_TO_ENTRY(sel) + newcount > LDT_SIZE) i = oldcount;
 223         else
 224             for (i = oldcount; i < newcount; i++)
 225                 if (!IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)+i)) break;
 226
 227         if (i < newcount)  /* they are not free */
 228         {
 229             SELECTOR_FreeBlock( sel, oldcount );
 230             sel = AllocSelectorArray( newcount );
 231         }
 232         else  /* mark the selectors as allocated */
 233         {
 234             for (i = oldcount; i < newcount; i++)
 235                 ldt_flags_copy[SELECTOR_TO_ENTRY(sel)+i] |=LDT_FLAGS_ALLOCATED;
 236         }
 237     }
 238     else if (oldcount > newcount) /* We need to remove selectors */
 239     {
 240         SELECTOR_FreeBlock( ENTRY_TO_SELECTOR(SELECTOR_TO_ENTRY(sel)+newcount),
 241                             oldcount - newcount );
 242     }
 243     if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
 244     return sel;
 245 }
 246
 247
 248 /***********************************************************************
 249  *           PrestoChangoSelector   (KERNEL.177)
 250  */
 251 WORD WINAPI PrestoChangoSelector( WORD selSrc, WORD selDst )
 252 {
 253     ldt_entry entry;
 254     LDT_GetEntry( SELECTOR_TO_ENTRY( selSrc ), &entry );
 255     entry.type ^= SEGMENT_CODE;  /* toggle the executable bit */
 256     LDT_SetEntry( SELECTOR_TO_ENTRY( selDst ), &entry );
 257     return selDst;
 258 }
 259
 260
 261 /***********************************************************************
 262  *           AllocCStoDSAlias   (KERNEL.170)
 263  */
 264 WORD WINAPI AllocCStoDSAlias( WORD sel )
 265 {
 266     WORD newsel;
 267     ldt_entry entry;
 268
 269     newsel = AllocSelectorArray( 1 );
 270     TRACE(selector, "(%04x): returning %04x\n",
 271                       sel, newsel );
 272     if (!newsel) return 0;
 273     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 274     entry.type = SEGMENT_DATA;
 275     LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
 276     return newsel;
 277 }
 278
 279
 280 /***********************************************************************
 281  *           AllocDStoCSAlias   (KERNEL.171)
 282  */
 283 WORD WINAPI AllocDStoCSAlias( WORD sel )
 284 {
 285     WORD newsel;
 286     ldt_entry entry;
 287
 288     newsel = AllocSelectorArray( 1 );
 289     TRACE(selector, "(%04x): returning %04x\n",
 290                       sel, newsel );
 291     if (!newsel) return 0;
 292     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 293     entry.type = SEGMENT_CODE;
 294     LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
 295     return newsel;
 296 }
 297
 298
 299 /***********************************************************************
 300  *           LongPtrAdd   (KERNEL.180)
 301  */
 302 void WINAPI LongPtrAdd( DWORD ptr, DWORD add )
 303 {
 304     ldt_entry entry;
 305     LDT_GetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
 306     entry.base += add;
 307     LDT_SetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
 308 }
 309
 310
 311 /***********************************************************************
 312  *           GetSelectorBase   (KERNEL.186)
 313  */
 314 DWORD WINAPI GetSelectorBase( WORD sel )
 315 {
 316     DWORD base = GET_SEL_BASE(sel);
 317
 318     /* if base points into DOSMEM, assume we have to
 319      * return pointer into physical lower 1MB */
 320
 321     return DOSMEM_MapLinearToDos( (LPVOID)base );
 322 }
 323
 324
 325 /***********************************************************************
 326  *           SetSelectorBase   (KERNEL.187)
 327  */
 328 WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
 329 {
 330     ldt_entry entry;
 331
 332     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 333
 334     entry.base = (DWORD)DOSMEM_MapDosToLinear(base);
 335
 336     LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 337     return sel;
 338 }
 339
 340
 341 /***********************************************************************
 342  *           GetSelectorLimit   (KERNEL.188)
 343  */
 344 DWORD WINAPI GetSelectorLimit( WORD sel )
 345 {
 346     return GET_SEL_LIMIT(sel);
 347 }
 348
 349
 350 /***********************************************************************
 351  *           SetSelectorLimit   (KERNEL.189)
 352  */
 353 WORD WINAPI SetSelectorLimit( WORD sel, DWORD limit )
 354 {
 355     ldt_entry entry;
 356     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 357     entry.limit_in_pages = (limit >= 0x100000);
 358     if (entry.limit_in_pages) entry.limit = limit >> 12;
 359     else entry.limit = limit;
 360     LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 361     return sel;
 362 }
 363
 364
 365 /***********************************************************************
 366  *           SelectorAccessRights   (KERNEL.196)
 367  */
 368 WORD WINAPI SelectorAccessRights( WORD sel, WORD op, WORD val )
 369 {
 370     ldt_entry entry;
 371     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 372     if (op == 0)  /* get */
 373     {
 374         return 0x01 | /* accessed */
 375                0x10 | /* not system */
 376                0x60 | /* DPL 3 */
 377                0x80 | /* present */
 378                ((entry.read_only == 0) << 1) |
 379                (entry.type << 2) |
 380                (entry.seg_32bit << 14) |
 381                (entry.limit_in_pages << 15);
 382     }
 383     else  /* set */
 384     {
 385         entry.read_only = ((val & 2) == 0);
 386         entry.type = (val >> 2) & 3;
 387         entry.seg_32bit = val & 0x4000;
 388         entry.limit_in_pages = val & 0x8000;
 389         LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 390         return 0;
 391     }
 392 }
 393
 394
 395 /***********************************************************************
 396  *           IsBadCodePtr16   (KERNEL.336)
 397  */
 398 BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
 399 {
 400     WORD sel;
 401     ldt_entry entry;
 402
 403     sel = SELECTOROF(lpfn);
 404     if (!sel) return TRUE;
 405     if (IS_SELECTOR_FREE(sel)) return TRUE;
 406     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 407     if (entry.type != SEGMENT_CODE) return TRUE;
 408     if (OFFSETOF(lpfn) > entry.limit) return TRUE;
 409     return FALSE;
 410 }
 411
 412
 413 /***********************************************************************
 414  *           IsBadStringPtr16   (KERNEL.337)
 415  */
 416 BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
 417 {
 418     WORD sel;
 419     ldt_entry entry;
 420
 421     sel = SELECTOROF(ptr);
 422     if (!sel) return TRUE;
 423     if (IS_SELECTOR_FREE(sel)) return TRUE;
 424     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 425     if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
 426     if (strlen(PTR_SEG_TO_LIN(ptr)) < size) size = strlen(PTR_SEG_TO_LIN(ptr));
 427     if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
 428     return FALSE;
 429 }
 430
 431
 432 /***********************************************************************
 433  *           IsBadHugeReadPtr16   (KERNEL.346)
 434  */
 435 BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
 436 {
 437     WORD sel;
 438     ldt_entry entry;
 439
 440     sel = SELECTOROF(ptr);
 441     if (!sel) return TRUE;
 442     if (IS_SELECTOR_FREE(sel)) return TRUE;
 443     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 444     if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
 445     if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
 446     return FALSE;
 447 }
 448
 449
 450 /***********************************************************************
 451  *           IsBadHugeWritePtr16   (KERNEL.347)
 452  */
 453 BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
 454 {
 455     WORD sel;
 456     ldt_entry entry;
 457
 458     sel = SELECTOROF(ptr);
 459     if (!sel) return TRUE;
 460     if (IS_SELECTOR_FREE(sel)) return TRUE;
 461     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 462     if ((entry.type == SEGMENT_CODE) || entry.read_only) return TRUE;
 463     if (OFFSETOF(ptr) + size - 1 > entry.limit) return TRUE;
 464     return FALSE;
 465 }
 466
 467 /***********************************************************************
 468  *           IsBadReadPtr16   (KERNEL.334)
 469  */
 470 BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
 471 {
 472     return IsBadHugeReadPtr16( ptr, size );
 473 }
 474
 475
 476 /***********************************************************************
 477  *           IsBadWritePtr16   (KERNEL.335)
 478  */
 479 BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
 480 {
 481     return IsBadHugeWritePtr16( ptr, size );
 482 }
 483
 484
 485 /***********************************************************************
 486  *           MemoryRead   (TOOLHELP.78)
 487  */
 488 DWORD WINAPI MemoryRead( WORD sel, DWORD offset, void *buffer, DWORD count )
 489 {
 490     if (IS_SELECTOR_FREE(sel)) return 0;
 491     if (offset > GET_SEL_LIMIT(sel)) return 0;
 492     if (offset + count > GET_SEL_LIMIT(sel) + 1)
 493         count = GET_SEL_LIMIT(sel) + 1 - offset;
 494     memcpy( buffer, ((char *)GET_SEL_BASE(sel)) + offset, count );
 495     return count;
 496 }
 497
 498
 499 /***********************************************************************
 500  *           MemoryWrite   (TOOLHELP.79)
 501  */
 502 DWORD WINAPI MemoryWrite( WORD sel, DWORD offset, void *buffer, DWORD count )
 503 {
 504     if (IS_SELECTOR_FREE(sel)) return 0;
 505     if (offset > GET_SEL_LIMIT(sel)) return 0;
 506     if (offset + count > GET_SEL_LIMIT(sel) + 1)
 507         count = GET_SEL_LIMIT(sel) + 1 - offset;
 508     memcpy( ((char *)GET_SEL_BASE(sel)) + offset, buffer, count );
 509     return count;
 510 }
 511
 512 /************************************* Win95 pointer mapping functions *
 513  *
 514  */
 515
 516 /***********************************************************************
 517  *           MapSL   (KERNEL32.523)
 518  *
 519  * Maps fixed segmented pointer to linear.
 520  */
 521 LPVOID WINAPI MapSL( SEGPTR sptr )
 522 {
 523     return (LPVOID)PTR_SEG_TO_LIN(sptr);
 524 }
 525
 526 /***********************************************************************
 527  *           MapSLFix   (KERNEL32.524)
 528  *
 529  * FIXME: MapSLFix and UnMapSLFixArray should probably prevent
 530  * unexpected linear address change when GlobalCompact() shuffles
 531  * moveable blocks.
 532  */
 533
 534 LPVOID WINAPI MapSLFix( SEGPTR sptr )
 535 {
 536     return (LPVOID)PTR_SEG_TO_LIN(sptr);
 537 }
 538
 539 /***********************************************************************
 540  *           UnMapSLFixArray   (KERNEL32.701)
 541  */
 542
 543 void WINAPI UnMapSLFixArray( SEGPTR sptr[], INT32 length )
 544 {
 545 }
 546
 547 /***********************************************************************
 548  *           MapLS   (KERNEL32.522)
 549  *
 550  * Maps linear pointer to segmented.
 551  */
 552 SEGPTR WINAPI MapLS( LPVOID ptr )
 553 {
 554     if (!HIWORD(ptr))
 555         return (SEGPTR)ptr;
 556     else
 557     {
 558         WORD sel = SELECTOR_AllocBlock( ptr, 0x10000, SEGMENT_DATA, FALSE, FALSE );
 559         return PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 560     }
 561 }
 562
 563
 564 /***********************************************************************
 565  *           UnMapLS   (KERNEL32.700)
 566  *
 567  * Free mapped selector.
 568  */
 569 void WINAPI UnMapLS( SEGPTR sptr )
 570 {
 571     if (SELECTOROF(sptr))
 572         SELECTOR_FreeBlock( SELECTOROF(sptr), 1 );
 573 }
 574
 575 /***********************************************************************
 576  *           GetThreadSelectorEntry   (KERNEL32)
 577  * FIXME: add #ifdef i386 for non x86
 578  */
 579 BOOL32 WINAPI GetThreadSelectorEntry( HANDLE32 hthread, DWORD sel,
 580                                       LPLDT_ENTRY ldtent)
 581 {
 582     ldt_entry   ldtentry;
 583
 584     LDT_GetEntry(SELECTOR_TO_ENTRY(sel),&ldtentry);
 585     ldtent->BaseLow = ldtentry.base & 0x0000ffff;
 586     ldtent->HighWord.Bits.BaseMid = (ldtentry.base & 0x00ff0000) >> 16;
 587     ldtent->HighWord.Bits.BaseHi = (ldtentry.base & 0xff000000) >> 24;
 588     ldtent->LimitLow = ldtentry.limit & 0x0000ffff;
 589     ldtent->HighWord.Bits.LimitHi = (ldtentry.limit & 0x00ff0000) >> 16;
 590     ldtent->HighWord.Bits.Dpl = 3;
 591     ldtent->HighWord.Bits.Sys = 0;
 592     ldtent->HighWord.Bits.Pres = 1;
 593     ldtent->HighWord.Bits.Type = 0x10|(ldtentry.type << 2);
 594     if (ldtentry.read_only)
 595         ldtent->HighWord.Bits.Type|=0x2;
 596     ldtent->HighWord.Bits.Granularity = ldtentry.limit_in_pages;
 597     ldtent->HighWord.Bits.Default_Big = ldtentry.seg_32bit;
 598     return TRUE;
 599 }
 600
 601
 602 /**********************************************************************
 603  *              SMapLS*         (KERNEL32)
 604  * These functions map linear pointers at [EBP+xxx] to segmented pointers
 605  * and return them.
 606  * Win95 uses some kind of alias structs, which it stores in [EBP+x] to
 607  * unravel them at SUnMapLS. We just store the segmented pointer there.
 608  */
 609 static void
 610 x_SMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
 611     DWORD       val,ptr;
 612
 613     val =*(DWORD*)(EBP_reg(context)+argoff);
 614     if (val<0x10000) {
 615         ptr=val;
 616         *(DWORD*)(EBP_reg(context)+argoff) = 0;
 617     } else {
 618         ptr = MapLS((LPVOID)val);
 619         *(DWORD*)(EBP_reg(context)+argoff) = ptr;
 620     }
 621     EAX_reg(context) = ptr;
 622 }
 623
 624 REGS_ENTRYPOINT(SMapLS_IP_EBP_8)  {x_SMapLS_IP_EBP_x(context,8);}
 625 REGS_ENTRYPOINT(SMapLS_IP_EBP_12) {x_SMapLS_IP_EBP_x(context,12);}
 626 REGS_ENTRYPOINT(SMapLS_IP_EBP_16) {x_SMapLS_IP_EBP_x(context,16);}
 627 REGS_ENTRYPOINT(SMapLS_IP_EBP_20) {x_SMapLS_IP_EBP_x(context,20);}
 628 REGS_ENTRYPOINT(SMapLS_IP_EBP_24) {x_SMapLS_IP_EBP_x(context,24);}
 629 REGS_ENTRYPOINT(SMapLS_IP_EBP_28) {x_SMapLS_IP_EBP_x(context,28);}
 630 REGS_ENTRYPOINT(SMapLS_IP_EBP_32) {x_SMapLS_IP_EBP_x(context,32);}
 631 REGS_ENTRYPOINT(SMapLS_IP_EBP_36) {x_SMapLS_IP_EBP_x(context,36);}
 632 REGS_ENTRYPOINT(SMapLS_IP_EBP_40) {x_SMapLS_IP_EBP_x(context,40);}
 633
 634 REGS_ENTRYPOINT(SMapLS)
 635 {
 636     if (EAX_reg(context)>=0x10000) {
 637         EAX_reg(context) = MapLS((LPVOID)EAX_reg(context));
 638         EDX_reg(context) = EAX_reg(context);
 639     } else {
 640         EDX_reg(context) = 0;
 641     }
 642 }
 643
 644 REGS_ENTRYPOINT(SUnMapLS)
 645 {
 646     if (EAX_reg(context)>=0x10000)
 647         UnMapLS((SEGPTR)EAX_reg(context));
 648 }
 649
 650 static void
 651 x_SUnMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
 652         if (*(DWORD*)(EBP_reg(context)+argoff))
 653                 UnMapLS(*(DWORD*)(EBP_reg(context)+argoff));
 654         *(DWORD*)(EBP_reg(context)+argoff)=0;
 655 }
 656 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_8)  { x_SUnMapLS_IP_EBP_x(context,12); }
 657 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_12) { x_SUnMapLS_IP_EBP_x(context,12); }
 658 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_16) { x_SUnMapLS_IP_EBP_x(context,16); }
 659 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_20) { x_SUnMapLS_IP_EBP_x(context,20); }
 660 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_24) { x_SUnMapLS_IP_EBP_x(context,24); }
 661 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_28) { x_SUnMapLS_IP_EBP_x(context,28); }
 662 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_32) { x_SUnMapLS_IP_EBP_x(context,32); }
 663 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_36) { x_SUnMapLS_IP_EBP_x(context,36); }
 664 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_40) { x_SUnMapLS_IP_EBP_x(context,40); }
 665
 666 /**********************************************************************
 667  *              AllocMappedBuffer       (KERNEL32.38)
 668  *
 669  * This is a undocumented KERNEL32 function that
 670  * SMapLS's a GlobalAlloc'ed buffer.
 671  *
 672  * Input:   EDI register: size of buffer to allocate
 673  * Output:  EDI register: pointer to buffer
 674  *
 675  * Note: The buffer is preceeded by 8 bytes:
 676  *        ...
 677  *       edi+0   buffer
 678  *       edi-4   SEGPTR to buffer
 679  *       edi-8   some magic Win95 needs for SUnMapLS
 680  *               (we use it for the memory handle)
 681  *
 682  *       The SEGPTR is used by the caller!
 683  */
 684
 685 REGS_ENTRYPOINT(AllocMappedBuffer)
 686 {
 687     HGLOBAL32 handle = GlobalAlloc32(0, EDI_reg(context) + 8);
 688     DWORD *buffer = (DWORD *)GlobalLock32(handle);
 689     SEGPTR ptr = 0;
 690
 691     if (buffer)
 692         if (!(ptr = MapLS(buffer + 2)))
 693         {
 694             GlobalUnlock32(handle);
 695             GlobalFree32(handle);
 696         }
 697
 698     if (!ptr)
 699         EAX_reg(context) = EDI_reg(context) = 0;
 700     else
 701     {
 702         buffer[0] = handle;
 703         buffer[1] = ptr;
 704
 705         EAX_reg(context) = (DWORD) ptr;
 706         EDI_reg(context) = (DWORD)(buffer + 2);
 707     }
 708 }
 709
 710 /**********************************************************************
 711  *              FreeMappedBuffer        (KERNEL32.39)
 712  *
 713  * Free a buffer allocated by AllocMappedBuffer
 714  *
 715  * Input: EDI register: pointer to buffer
 716  */
 717
 718 REGS_ENTRYPOINT(FreeMappedBuffer)
 719 {
 720     if (EDI_reg(context))
 721     {
 722         DWORD *buffer = (DWORD *)EDI_reg(context) - 2;
 723
 724         UnMapLS(buffer[1]);
 725
 726         GlobalUnlock32(buffer[0]);
 727         GlobalFree32(buffer[0]);
 728     }
 729 }
 730
 731 /**********************************************************************
 732  *           WOWGetVDMPointer   (KERNEL32.55)
 733  * Get linear from segmented pointer. (MSDN lib)
 734  */
 735 LPVOID WINAPI WOWGetVDMPointer(DWORD vp,DWORD nrofbytes,BOOL32 protected)
 736 {
 737     /* FIXME: add size check too */
 738     if (protected)
 739         return PTR_SEG_TO_LIN(vp);
 740     else
 741         return DOSMEM_MapRealToLinear(vp);
 742 }
 743
 744 /**********************************************************************
 745  *           GetVDMPointer32W   (KERNEL.516)
 746  */
 747 LPVOID WINAPI GetVDMPointer32W(DWORD vp,DWORD mode)
 748 {
 749     return WOWGetVDMPointer(vp,0,mode);
 750 }
 751
 752 /**********************************************************************
 753  *           WOWGetVDMPointerFix (KERNEL32.55)
 754  * Dito, but fix heapsegment (MSDN lib)
 755  */
 756 LPVOID WINAPI WOWGetVDMPointerFix(DWORD vp,DWORD nrofbytes,BOOL32 protected)
 757 {
 758     /* FIXME: fix heapsegment */
 759     return WOWGetVDMPointer(vp,nrofbytes,protected);
 760 }
 761
 762 /**********************************************************************
 763  *           WOWGetVDMPointerUnFix (KERNEL32.56)
 764  */
 765 void WINAPI WOWGetVDMPointerUnfix(DWORD vp)
 766 {
 767     /* FIXME: unfix heapsegment */
 768 }
 769
 770 /***********************************************************************
 771  *           UTSelectorOffsetToLinear       (WIN32S16.48)
 772  *
 773  * rough guesswork, but seems to work (I had no "reasonable" docu)
 774  */
 775 LPVOID WINAPI UTSelectorOffsetToLinear(SEGPTR sptr)
 776 {
 777         return PTR_SEG_TO_LIN(sptr);
 778 }
 779
 780 /***********************************************************************
 781  *           UTLinearToSelectorOffset       (WIN32S16.49)
 782  *
 783  * FIXME: I don't know if that's the right way to do linear -> segmented
 784  */
 785 SEGPTR WINAPI UTLinearToSelectorOffset(LPVOID lptr)
 786 {
 787     return (SEGPTR)lptr;
 788 }