memory/selector.c

   1 /*
   2  * Selector manipulation functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <string.h>
   8 #include "wine/winbase16.h"
   9 #include "ldt.h"
  10 #include "miscemu.h"
  11 #include "selectors.h"
  12 #include "stackframe.h"
  13 #include "process.h"
  14 #include "debug.h"
  15
  16
  17 /***********************************************************************
  18  *           AllocSelectorArray   (KERNEL.206)
  19  */
  20 WORD WINAPI AllocSelectorArray16( WORD count )
  21 {
  22     WORD i, sel, size = 0;
  23     ldt_entry entry;
  24
  25     if (!count) return 0;
  26     for (i = FIRST_LDT_ENTRY_TO_ALLOC; i < LDT_SIZE; i++)
  27     {
  28         if (!IS_LDT_ENTRY_FREE(i)) size = 0;
  29         else if (++size >= count) break;
  30     }
  31     if (i == LDT_SIZE) return 0;
  32     sel = i - size + 1;
  33
  34     entry.base           = 0;
  35     entry.type           = SEGMENT_DATA;
  36     entry.seg_32bit      = FALSE;
  37     entry.read_only      = FALSE;
  38     entry.limit_in_pages = FALSE;
  39     entry.limit          = 1;  /* avoid 0 base and limit */
  40
  41     for (i = 0; i < count; i++)
  42     {
  43         /* Mark selector as allocated */
  44         ldt_flags_copy[sel + i] |= LDT_FLAGS_ALLOCATED;
  45         LDT_SetEntry( sel + i, &entry );
  46     }
  47     return ENTRY_TO_SELECTOR( sel );
  48 }
  49
  50
  51 /***********************************************************************
  52  *           AllocSelector   (KERNEL.175)
  53  */
  54 WORD WINAPI AllocSelector16( WORD sel )
  55 {
  56     WORD newsel, count, i;
  57
  58     count = sel ? ((GET_SEL_LIMIT(sel) >> 16) + 1) : 1;
  59     newsel = AllocSelectorArray16( count );
  60     TRACE(selector, "(%04x): returning %04x\n",
  61                       sel, newsel );
  62     if (!newsel) return 0;
  63     if (!sel) return newsel;  /* nothing to copy */
  64     for (i = 0; i < count; i++)
  65     {
  66         ldt_entry entry;
  67         LDT_GetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
  68         LDT_SetEntry( SELECTOR_TO_ENTRY(newsel) + i, &entry );
  69     }
  70     return newsel;
  71 }
  72
  73
  74 /***********************************************************************
  75  *           FreeSelector   (KERNEL.176)
  76  */
  77 WORD WINAPI FreeSelector16( WORD sel )
  78 {
  79     if (IS_SELECTOR_FREE(sel)) return sel;  /* error */
  80     SELECTOR_FreeBlock( sel, 1 );
  81     return 0;
  82 }
  83
  84
  85 /***********************************************************************
  86  *           SELECTOR_SetEntries
  87  *
  88  * Set the LDT entries for an array of selectors.
  89  */
  90 static void SELECTOR_SetEntries( WORD sel, const void *base, DWORD size,
  91                                  enum seg_type type, BOOL is32bit,
  92                                  BOOL readonly )
  93 {
  94     ldt_entry entry;
  95     WORD i, count;
  96
  97     /* The limit for the first selector is the whole */
  98     /* block. The next selectors get a 64k limit.    */
  99     entry.base           = (unsigned long)base;
 100     entry.type           = type;
 101     entry.seg_32bit      = is32bit;
 102     entry.read_only      = readonly;
 103     entry.limit_in_pages = (size > 0x100000);
 104     if (entry.limit_in_pages) entry.limit = ((size + 0xfff) >> 12) - 1;
 105     else entry.limit = size - 1;
 106     /* Make sure base and limit are not 0 together if the size is not 0 */
 107     if (!base && !entry.limit && size) entry.limit = 1;
 108     count = (size + 0xffff) / 0x10000;
 109     for (i = 0; i < count; i++)
 110     {
 111         LDT_SetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 112         entry.base += 0x10000;
 113         /* Apparently the next selectors should *not* get a 64k limit. */
 114         /* Can't remember where I read they should... --AJ */
 115         entry.limit -= entry.limit_in_pages ? 0x10 : 0x10000;
 116     }
 117 }
 118
 119
 120 /***********************************************************************
 121  *           SELECTOR_AllocBlock
 122  *
 123  * Allocate selectors for a block of linear memory.
 124  */
 125 WORD SELECTOR_AllocBlock( const void *base, DWORD size, enum seg_type type,
 126                           BOOL is32bit, BOOL readonly )
 127 {
 128     WORD sel, count;
 129
 130     if (!size) return 0;
 131     count = (size + 0xffff) / 0x10000;
 132     sel = AllocSelectorArray16( count );
 133     if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
 134     return sel;
 135 }
 136
 137
 138 /***********************************************************************
 139  *           SELECTOR_MoveBlock
 140  *
 141  * Move a block of selectors in linear memory.
 142  */
 143 void SELECTOR_MoveBlock( WORD sel, const void *new_base )
 144 {
 145     WORD i, count = (GET_SEL_LIMIT(sel) >> 16) + 1;
 146
 147     for (i = 0; i < count; i++)
 148     {
 149         ldt_entry entry;
 150         LDT_GetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 151         entry.base = (unsigned long)new_base;
 152         LDT_SetEntry( SELECTOR_TO_ENTRY(sel) + i, &entry );
 153     }
 154 }
 155
 156
 157 /***********************************************************************
 158  *           SELECTOR_FreeBlock
 159  *
 160  * Free a block of selectors.
 161  */
 162 void SELECTOR_FreeBlock( WORD sel, WORD count )
 163 {
 164     WORD i, nextsel;
 165     ldt_entry entry;
 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
 195
 196 /***********************************************************************
 197  *           SELECTOR_ReallocBlock
 198  *
 199  * Change the size of a block of selectors.
 200  */
 201 WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size,
 202                            enum seg_type type, BOOL is32bit, BOOL readonly)
 203 {
 204     WORD i, oldcount, newcount;
 205
 206     if (!size) size = 1;
 207     oldcount = (GET_SEL_LIMIT(sel) >> 16) + 1;
 208     newcount = (size + 0xffff) >> 16;
 209
 210     if (oldcount < newcount)  /* We need to add selectors */
 211     {
 212           /* Check if the next selectors are free */
 213         if (SELECTOR_TO_ENTRY(sel) + newcount > LDT_SIZE) i = oldcount;
 214         else
 215             for (i = oldcount; i < newcount; i++)
 216                 if (!IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)+i)) break;
 217
 218         if (i < newcount)  /* they are not free */
 219         {
 220             SELECTOR_FreeBlock( sel, oldcount );
 221             sel = AllocSelectorArray16( newcount );
 222         }
 223         else  /* mark the selectors as allocated */
 224         {
 225             for (i = oldcount; i < newcount; i++)
 226                 ldt_flags_copy[SELECTOR_TO_ENTRY(sel)+i] |=LDT_FLAGS_ALLOCATED;
 227         }
 228     }
 229     else if (oldcount > newcount) /* We need to remove selectors */
 230     {
 231         SELECTOR_FreeBlock( ENTRY_TO_SELECTOR(SELECTOR_TO_ENTRY(sel)+newcount),
 232                             oldcount - newcount );
 233     }
 234     if (sel) SELECTOR_SetEntries( sel, base, size, type, is32bit, readonly );
 235     return sel;
 236 }
 237
 238
 239 /***********************************************************************
 240  *           PrestoChangoSelector   (KERNEL.177)
 241  */
 242 WORD WINAPI PrestoChangoSelector16( WORD selSrc, WORD selDst )
 243 {
 244     ldt_entry entry;
 245     LDT_GetEntry( SELECTOR_TO_ENTRY( selSrc ), &entry );
 246     entry.type ^= SEGMENT_CODE;  /* toggle the executable bit */
 247     LDT_SetEntry( SELECTOR_TO_ENTRY( selDst ), &entry );
 248     return selDst;
 249 }
 250
 251
 252 /***********************************************************************
 253  *           AllocCStoDSAlias   (KERNEL.170)
 254  */
 255 WORD WINAPI AllocCStoDSAlias16( WORD sel )
 256 {
 257     WORD newsel;
 258     ldt_entry entry;
 259
 260     newsel = AllocSelectorArray16( 1 );
 261     TRACE(selector, "(%04x): returning %04x\n",
 262                       sel, newsel );
 263     if (!newsel) return 0;
 264     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 265     entry.type = SEGMENT_DATA;
 266     LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
 267     return newsel;
 268 }
 269
 270
 271 /***********************************************************************
 272  *           AllocDStoCSAlias   (KERNEL.171)
 273  */
 274 WORD WINAPI AllocDStoCSAlias16( WORD sel )
 275 {
 276     WORD newsel;
 277     ldt_entry entry;
 278
 279     newsel = AllocSelectorArray16( 1 );
 280     TRACE(selector, "(%04x): returning %04x\n",
 281                       sel, newsel );
 282     if (!newsel) return 0;
 283     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 284     entry.type = SEGMENT_CODE;
 285     LDT_SetEntry( SELECTOR_TO_ENTRY(newsel), &entry );
 286     return newsel;
 287 }
 288
 289
 290 /***********************************************************************
 291  *           LongPtrAdd   (KERNEL.180)
 292  */
 293 void WINAPI LongPtrAdd16( DWORD ptr, DWORD add )
 294 {
 295     ldt_entry entry;
 296     LDT_GetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
 297     entry.base += add;
 298     LDT_SetEntry( SELECTOR_TO_ENTRY(SELECTOROF(ptr)), &entry );
 299 }
 300
 301
 302 /***********************************************************************
 303  *           GetSelectorBase   (KERNEL.186)
 304  */
 305 DWORD WINAPI WIN16_GetSelectorBase( WORD sel )
 306 {
 307     /*
 308      * Note: For Win32s processes, the whole linear address space is
 309      *       shifted by 0x10000 relative to the OS linear address space.
 310      *       See the comment in msdos/vxd.c.
 311      */
 312
 313     DWORD base = GetSelectorBase( sel );
 314     return W32S_WINE2APP( base, W32S_APPLICATION() ? W32S_OFFSET : 0 );
 315 }
 316 DWORD WINAPI GetSelectorBase( WORD sel )
 317 {
 318     DWORD base = GET_SEL_BASE(sel);
 319
 320     /* if base points into DOSMEM, assume we have to
 321      * return pointer into physical lower 1MB */
 322
 323     return DOSMEM_MapLinearToDos( (LPVOID)base );
 324 }
 325
 326
 327 /***********************************************************************
 328  *           SetSelectorBase   (KERNEL.187)
 329  */
 330 DWORD WINAPI WIN16_SetSelectorBase( WORD sel, DWORD base )
 331 {
 332     /*
 333      * Note: For Win32s processes, the whole linear address space is
 334      *       shifted by 0x10000 relative to the OS linear address space.
 335      *       See the comment in msdos/vxd.c.
 336      */
 337
 338     SetSelectorBase( sel,
 339         W32S_APP2WINE( base, W32S_APPLICATION() ? W32S_OFFSET : 0 ) );
 340     return sel;
 341 }
 342 WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
 343 {
 344     ldt_entry entry;
 345
 346     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 347
 348     entry.base = (DWORD)DOSMEM_MapDosToLinear(base);
 349
 350     LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 351     return sel;
 352 }
 353
 354
 355 /***********************************************************************
 356  *           GetSelectorLimit   (KERNEL.188)
 357  */
 358 DWORD WINAPI GetSelectorLimit16( WORD sel )
 359 {
 360     return GET_SEL_LIMIT(sel);
 361 }
 362
 363
 364 /***********************************************************************
 365  *           SetSelectorLimit   (KERNEL.189)
 366  */
 367 WORD WINAPI SetSelectorLimit16( WORD sel, DWORD limit )
 368 {
 369     ldt_entry entry;
 370     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 371     entry.limit_in_pages = (limit >= 0x100000);
 372     if (entry.limit_in_pages) entry.limit = limit >> 12;
 373     else entry.limit = limit;
 374     LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 375     return sel;
 376 }
 377
 378
 379 /***********************************************************************
 380  *           SelectorAccessRights   (KERNEL.196)
 381  */
 382 WORD WINAPI SelectorAccessRights16( WORD sel, WORD op, WORD val )
 383 {
 384     ldt_entry entry;
 385     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 386     if (op == 0)  /* get */
 387     {
 388         return 0x01 | /* accessed */
 389                0x10 | /* not system */
 390                0x60 | /* DPL 3 */
 391                0x80 | /* present */
 392                ((entry.read_only == 0) << 1) |
 393                (entry.type << 2) |
 394                (entry.seg_32bit << 14) |
 395                (entry.limit_in_pages << 15);
 396     }
 397     else  /* set */
 398     {
 399         entry.read_only = ((val & 2) == 0);
 400         entry.type = (val >> 2) & 3;
 401         entry.seg_32bit = val & 0x4000;
 402         entry.limit_in_pages = val & 0x8000;
 403         LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 404         return 0;
 405     }
 406 }
 407
 408
 409 /***********************************************************************
 410  *           IsBadCodePtr16   (KERNEL.336)
 411  */
 412 BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
 413 {
 414     WORD sel;
 415     ldt_entry entry;
 416
 417     sel = SELECTOROF(lpfn);
 418     if (!sel) return TRUE;
 419     if (IS_SELECTOR_FREE(sel)) return TRUE;
 420     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 421     if (entry.type != SEGMENT_CODE) return TRUE;
 422     if (OFFSETOF(lpfn) > GET_SEL_LIMIT(sel)) return TRUE;
 423     return FALSE;
 424 }
 425
 426
 427 /***********************************************************************
 428  *           IsBadStringPtr16   (KERNEL.337)
 429  */
 430 BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
 431 {
 432     WORD sel;
 433     ldt_entry entry;
 434
 435     sel = SELECTOROF(ptr);
 436     if (!sel) return TRUE;
 437     if (IS_SELECTOR_FREE(sel)) return TRUE;
 438     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 439     if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
 440     if (strlen(PTR_SEG_TO_LIN(ptr)) < size) size = strlen(PTR_SEG_TO_LIN(ptr));
 441     if (OFFSETOF(ptr) + size - 1 > GET_SEL_LIMIT(sel)) return TRUE;
 442     return FALSE;
 443 }
 444
 445
 446 /***********************************************************************
 447  *           IsBadHugeReadPtr16   (KERNEL.346)
 448  */
 449 BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
 450 {
 451     WORD sel;
 452     ldt_entry entry;
 453
 454     sel = SELECTOROF(ptr);
 455     if (!sel) return TRUE;
 456     if (IS_SELECTOR_FREE(sel)) return TRUE;
 457     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 458     if ((entry.type == SEGMENT_CODE) && entry.read_only) return TRUE;
 459     if (OFFSETOF(ptr) + size - 1 > GET_SEL_LIMIT(sel)) return TRUE;
 460     return FALSE;
 461 }
 462
 463
 464 /***********************************************************************
 465  *           IsBadHugeWritePtr16   (KERNEL.347)
 466  */
 467 BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
 468 {
 469     WORD sel;
 470     ldt_entry entry;
 471
 472     sel = SELECTOROF(ptr);
 473     if (!sel) return TRUE;
 474     if (IS_SELECTOR_FREE(sel)) return TRUE;
 475     LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
 476     if ((entry.type == SEGMENT_CODE) || entry.read_only) return TRUE;
 477     if (OFFSETOF(ptr) + size - 1 > GET_SEL_LIMIT(sel)) return TRUE;
 478     return FALSE;
 479 }
 480
 481 /***********************************************************************
 482  *           IsBadReadPtr16   (KERNEL.334)
 483  */
 484 BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
 485 {
 486     return IsBadHugeReadPtr16( ptr, size );
 487 }
 488
 489
 490 /***********************************************************************
 491  *           IsBadWritePtr16   (KERNEL.335)
 492  */
 493 BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
 494 {
 495     return IsBadHugeWritePtr16( ptr, size );
 496 }
 497
 498
 499 /***********************************************************************
 500  *           MemoryRead   (TOOLHELP.78)
 501  */
 502 DWORD WINAPI MemoryRead16( 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( buffer, ((char *)GET_SEL_BASE(sel)) + offset, count );
 509     return count;
 510 }
 511
 512
 513 /***********************************************************************
 514  *           MemoryWrite   (TOOLHELP.79)
 515  */
 516 DWORD WINAPI MemoryWrite16( WORD sel, DWORD offset, void *buffer, DWORD count )
 517 {
 518     if (IS_SELECTOR_FREE(sel)) return 0;
 519     if (offset > GET_SEL_LIMIT(sel)) return 0;
 520     if (offset + count > GET_SEL_LIMIT(sel) + 1)
 521         count = GET_SEL_LIMIT(sel) + 1 - offset;
 522     memcpy( ((char *)GET_SEL_BASE(sel)) + offset, buffer, count );
 523     return count;
 524 }
 525
 526 /************************************* Win95 pointer mapping functions *
 527  *
 528  */
 529
 530 /***********************************************************************
 531  *           MapSL   (KERNEL32.523)
 532  *
 533  * Maps fixed segmented pointer to linear.
 534  */
 535 LPVOID WINAPI MapSL( SEGPTR sptr )
 536 {
 537     return (LPVOID)PTR_SEG_TO_LIN(sptr);
 538 }
 539
 540 /***********************************************************************
 541  *           MapSLFix   (KERNEL32.524)
 542  *
 543  * FIXME: MapSLFix and UnMapSLFixArray should probably prevent
 544  * unexpected linear address change when GlobalCompact() shuffles
 545  * moveable blocks.
 546  */
 547
 548 LPVOID WINAPI MapSLFix( SEGPTR sptr )
 549 {
 550     return (LPVOID)PTR_SEG_TO_LIN(sptr);
 551 }
 552
 553 /***********************************************************************
 554  *           UnMapSLFixArray   (KERNEL32.701)
 555  */
 556
 557 REGS_ENTRYPOINT(UnMapSLFixArray) /* SEGPTR sptr[], INT32 length */
 558 {
 559     /* Must not change EAX, hence defined as 'register' function */
 560     /* We need to remove the arguments ourselves */
 561     ESP_reg( context ) += 8;
 562 }
 563
 564 /***********************************************************************
 565  *           MapLS   (KERNEL32.522)
 566  *
 567  * Maps linear pointer to segmented.
 568  */
 569 SEGPTR WINAPI MapLS( LPVOID ptr )
 570 {
 571     if (!HIWORD(ptr))
 572         return (SEGPTR)ptr;
 573     else
 574     {
 575         WORD sel = SELECTOR_AllocBlock( ptr, 0x10000, SEGMENT_DATA, FALSE, FALSE );
 576         return PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 577     }
 578 }
 579
 580
 581 /***********************************************************************
 582  *           UnMapLS   (KERNEL32.700)
 583  *
 584  * Free mapped selector.
 585  */
 586 void WINAPI UnMapLS( SEGPTR sptr )
 587 {
 588     if (SELECTOROF(sptr))
 589         SELECTOR_FreeBlock( SELECTOROF(sptr), 1 );
 590 }
 591
 592 /***********************************************************************
 593  *           GetThreadSelectorEntry   (KERNEL32)
 594  * FIXME: add #ifdef i386 for non x86
 595  */
 596 BOOL WINAPI GetThreadSelectorEntry( HANDLE hthread, DWORD sel,
 597                                       LPLDT_ENTRY ldtent)
 598 {
 599     ldt_entry   ldtentry;
 600
 601     LDT_GetEntry(SELECTOR_TO_ENTRY(sel),&ldtentry);
 602     ldtent->BaseLow = ldtentry.base & 0x0000ffff;
 603     ldtent->HighWord.Bits.BaseMid = (ldtentry.base & 0x00ff0000) >> 16;
 604     ldtent->HighWord.Bits.BaseHi = (ldtentry.base & 0xff000000) >> 24;
 605     ldtent->LimitLow = ldtentry.limit & 0x0000ffff;
 606     ldtent->HighWord.Bits.LimitHi = (ldtentry.limit & 0x00ff0000) >> 16;
 607     ldtent->HighWord.Bits.Dpl = 3;
 608     ldtent->HighWord.Bits.Sys = 0;
 609     ldtent->HighWord.Bits.Pres = 1;
 610     ldtent->HighWord.Bits.Type = 0x10|(ldtentry.type << 2);
 611     if (ldtentry.read_only)
 612         ldtent->HighWord.Bits.Type|=0x2;
 613     ldtent->HighWord.Bits.Granularity = ldtentry.limit_in_pages;
 614     ldtent->HighWord.Bits.Default_Big = ldtentry.seg_32bit;
 615     return TRUE;
 616 }
 617
 618
 619 /**********************************************************************
 620  *              SMapLS*         (KERNEL32)
 621  * These functions map linear pointers at [EBP+xxx] to segmented pointers
 622  * and return them.
 623  * Win95 uses some kind of alias structs, which it stores in [EBP+x] to
 624  * unravel them at SUnMapLS. We just store the segmented pointer there.
 625  */
 626 static void
 627 x_SMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
 628     DWORD       val,ptr;
 629
 630     val =*(DWORD*)(EBP_reg(context)+argoff);
 631     if (val<0x10000) {
 632         ptr=val;
 633         *(DWORD*)(EBP_reg(context)+argoff) = 0;
 634     } else {
 635         ptr = MapLS((LPVOID)val);
 636         *(DWORD*)(EBP_reg(context)+argoff) = ptr;
 637     }
 638     EAX_reg(context) = ptr;
 639 }
 640
 641 REGS_ENTRYPOINT(SMapLS_IP_EBP_8)  {x_SMapLS_IP_EBP_x(context,8);}
 642 REGS_ENTRYPOINT(SMapLS_IP_EBP_12) {x_SMapLS_IP_EBP_x(context,12);}
 643 REGS_ENTRYPOINT(SMapLS_IP_EBP_16) {x_SMapLS_IP_EBP_x(context,16);}
 644 REGS_ENTRYPOINT(SMapLS_IP_EBP_20) {x_SMapLS_IP_EBP_x(context,20);}
 645 REGS_ENTRYPOINT(SMapLS_IP_EBP_24) {x_SMapLS_IP_EBP_x(context,24);}
 646 REGS_ENTRYPOINT(SMapLS_IP_EBP_28) {x_SMapLS_IP_EBP_x(context,28);}
 647 REGS_ENTRYPOINT(SMapLS_IP_EBP_32) {x_SMapLS_IP_EBP_x(context,32);}
 648 REGS_ENTRYPOINT(SMapLS_IP_EBP_36) {x_SMapLS_IP_EBP_x(context,36);}
 649 REGS_ENTRYPOINT(SMapLS_IP_EBP_40) {x_SMapLS_IP_EBP_x(context,40);}
 650
 651 REGS_ENTRYPOINT(SMapLS)
 652 {
 653     if (EAX_reg(context)>=0x10000) {
 654         EAX_reg(context) = MapLS((LPVOID)EAX_reg(context));
 655         EDX_reg(context) = EAX_reg(context);
 656     } else {
 657         EDX_reg(context) = 0;
 658     }
 659 }
 660
 661 REGS_ENTRYPOINT(SUnMapLS)
 662 {
 663     if (EAX_reg(context)>=0x10000)
 664         UnMapLS((SEGPTR)EAX_reg(context));
 665 }
 666
 667 static void
 668 x_SUnMapLS_IP_EBP_x(CONTEXT *context,int argoff) {
 669         if (*(DWORD*)(EBP_reg(context)+argoff))
 670                 UnMapLS(*(DWORD*)(EBP_reg(context)+argoff));
 671         *(DWORD*)(EBP_reg(context)+argoff)=0;
 672 }
 673 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_8)  { x_SUnMapLS_IP_EBP_x(context,8); }
 674 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_12) { x_SUnMapLS_IP_EBP_x(context,12); }
 675 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_16) { x_SUnMapLS_IP_EBP_x(context,16); }
 676 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_20) { x_SUnMapLS_IP_EBP_x(context,20); }
 677 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_24) { x_SUnMapLS_IP_EBP_x(context,24); }
 678 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_28) { x_SUnMapLS_IP_EBP_x(context,28); }
 679 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_32) { x_SUnMapLS_IP_EBP_x(context,32); }
 680 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_36) { x_SUnMapLS_IP_EBP_x(context,36); }
 681 REGS_ENTRYPOINT(SUnMapLS_IP_EBP_40) { x_SUnMapLS_IP_EBP_x(context,40); }
 682
 683 /**********************************************************************
 684  *              AllocMappedBuffer       (KERNEL32.38)
 685  *
 686  * This is a undocumented KERNEL32 function that
 687  * SMapLS's a GlobalAlloc'ed buffer.
 688  *
 689  * Input:   EDI register: size of buffer to allocate
 690  * Output:  EDI register: pointer to buffer
 691  *
 692  * Note: The buffer is preceeded by 8 bytes:
 693  *        ...
 694  *       edi+0   buffer
 695  *       edi-4   SEGPTR to buffer
 696  *       edi-8   some magic Win95 needs for SUnMapLS
 697  *               (we use it for the memory handle)
 698  *
 699  *       The SEGPTR is used by the caller!
 700  */
 701
 702 REGS_ENTRYPOINT(AllocMappedBuffer)
 703 {
 704     HGLOBAL handle = GlobalAlloc(0, EDI_reg(context) + 8);
 705     DWORD *buffer = (DWORD *)GlobalLock(handle);
 706     SEGPTR ptr = 0;
 707
 708     if (buffer)
 709         if (!(ptr = MapLS(buffer + 2)))
 710         {
 711             GlobalUnlock(handle);
 712             GlobalFree(handle);
 713         }
 714
 715     if (!ptr)
 716         EAX_reg(context) = EDI_reg(context) = 0;
 717     else
 718     {
 719         buffer[0] = handle;
 720         buffer[1] = ptr;
 721
 722         EAX_reg(context) = (DWORD) ptr;
 723         EDI_reg(context) = (DWORD)(buffer + 2);
 724     }
 725 }
 726
 727 /**********************************************************************
 728  *              FreeMappedBuffer        (KERNEL32.39)
 729  *
 730  * Free a buffer allocated by AllocMappedBuffer
 731  *
 732  * Input: EDI register: pointer to buffer
 733  */
 734
 735 REGS_ENTRYPOINT(FreeMappedBuffer)
 736 {
 737     if (EDI_reg(context))
 738     {
 739         DWORD *buffer = (DWORD *)EDI_reg(context) - 2;
 740
 741         UnMapLS(buffer[1]);
 742
 743         GlobalUnlock(buffer[0]);
 744         GlobalFree(buffer[0]);
 745     }
 746 }
 747
 748 /**********************************************************************
 749  *           WOWGetVDMPointer   (KERNEL32.55)
 750  * Get linear from segmented pointer. (MSDN lib)
 751  */
 752 LPVOID WINAPI WOWGetVDMPointer(DWORD vp,DWORD nrofbytes,BOOL protected)
 753 {
 754     /* FIXME: add size check too */
 755     if (protected)
 756         return PTR_SEG_TO_LIN(vp);
 757     else
 758         return DOSMEM_MapRealToLinear(vp);
 759 }
 760
 761 /**********************************************************************
 762  *           GetVDMPointer32W   (KERNEL.516)
 763  */
 764 LPVOID WINAPI GetVDMPointer32W(DWORD vp,WORD mode)
 765 {
 766     return WOWGetVDMPointer(vp,0,(DWORD)mode);
 767 }
 768
 769 /**********************************************************************
 770  *           WOWGetVDMPointerFix (KERNEL32.55)
 771  * Dito, but fix heapsegment (MSDN lib)
 772  */
 773 LPVOID WINAPI WOWGetVDMPointerFix(DWORD vp,DWORD nrofbytes,BOOL protected)
 774 {
 775     /* FIXME: fix heapsegment */
 776     return WOWGetVDMPointer(vp,nrofbytes,protected);
 777 }
 778
 779 /**********************************************************************
 780  *           WOWGetVDMPointerUnFix (KERNEL32.56)
 781  */
 782 void WINAPI WOWGetVDMPointerUnfix(DWORD vp)
 783 {
 784     /* FIXME: unfix heapsegment */
 785 }
 786
 787 /***********************************************************************
 788  *           UTSelectorOffsetToLinear       (WIN32S16.48)
 789  *
 790  * rough guesswork, but seems to work (I had no "reasonable" docu)
 791  */
 792 LPVOID WINAPI UTSelectorOffsetToLinear16(SEGPTR sptr)
 793 {
 794         return PTR_SEG_TO_LIN(sptr);
 795 }
 796
 797 /***********************************************************************
 798  *           UTLinearToSelectorOffset       (WIN32S16.49)
 799  *
 800  * FIXME: I don't know if that's the right way to do linear -> segmented
 801  */
 802 SEGPTR WINAPI UTLinearToSelectorOffset16(LPVOID lptr)
 803 {
 804     return (SEGPTR)lptr;
 805 }