dlls/kernel/selector.c

   1 /*
   2  * Selector manipulation functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <string.h>
  25
  26 #include "winerror.h"
  27 #include "wine/winbase16.h"
  28 #include "wine/server.h"
  29 #include "wine/debug.h"
  30 #include "kernel_private.h"
  31 #include "toolhelp.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(selector);
  34
  35 #define LDT_SIZE 8192
  36
  37 /* get the number of selectors needed to cover up to the selector limit */
  38 inline static WORD get_sel_count( WORD sel )
  39 {
  40     return (wine_ldt_copy.limit[sel >> __AHSHIFT] >> 16) + 1;
  41 }
  42
  43
  44 /***********************************************************************
  45  *           AllocSelectorArray   (KERNEL.206)
  46  */
  47 WORD WINAPI AllocSelectorArray16( WORD count )
  48 {
  49     WORD i, sel = wine_ldt_alloc_entries( count );
  50
  51     if (sel)
  52     {
  53         LDT_ENTRY entry;
  54         wine_ldt_set_base( &entry, 0 );
  55         wine_ldt_set_limit( &entry, 1 ); /* avoid 0 base and limit */
  56         wine_ldt_set_flags( &entry, WINE_LDT_FLAGS_DATA );
  57         for (i = 0; i < count; i++) wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
  58     }
  59     return sel;
  60 }
  61
  62
  63 /***********************************************************************
  64  *           AllocSelector   (KERNEL.175)
  65  */
  66 WORD WINAPI AllocSelector16( WORD sel )
  67 {
  68     WORD newsel, count, i;
  69
  70     count = sel ? get_sel_count(sel) : 1;
  71     newsel = wine_ldt_alloc_entries( count );
  72     TRACE("(%04x): returning %04x\n", sel, newsel );
  73     if (!newsel) return 0;
  74     if (!sel) return newsel;  /* nothing to copy */
  75     for (i = 0; i < count; i++)
  76     {
  77         LDT_ENTRY entry;
  78         wine_ldt_get_entry( sel + (i << __AHSHIFT), &entry );
  79         wine_ldt_set_entry( newsel + (i << __AHSHIFT), &entry );
  80     }
  81     return newsel;
  82 }
  83
  84
  85 /***********************************************************************
  86  *           FreeSelector   (KERNEL.176)
  87  */
  88 WORD WINAPI FreeSelector16( WORD sel )
  89 {
  90     LDT_ENTRY entry;
  91
  92     wine_ldt_get_entry( sel, &entry );
  93     if (wine_ldt_is_empty( &entry )) return sel;  /* error */
  94 #ifdef __i386__
  95     /* Check if we are freeing current %fs selector */
  96     if (!((wine_get_fs() ^ sel) & ~3))
  97         WARN("Freeing %%fs selector (%04x), not good.\n", wine_get_fs() );
  98 #endif  /* __i386__ */
  99     wine_ldt_free_entries( sel, 1 );
 100     return 0;
 101 }
 102
 103
 104 /***********************************************************************
 105  *           SELECTOR_SetEntries
 106  *
 107  * Set the LDT entries for an array of selectors.
 108  */
 109 static void SELECTOR_SetEntries( WORD sel, const void *base, DWORD size, unsigned char flags )
 110 {
 111     LDT_ENTRY entry;
 112     WORD i, count;
 113
 114     wine_ldt_set_base( &entry, base );
 115     wine_ldt_set_limit( &entry, size - 1 );
 116     wine_ldt_set_flags( &entry, flags );
 117     count = (size + 0xffff) / 0x10000;
 118     for (i = 0; i < count; i++)
 119     {
 120         wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
 121         wine_ldt_set_base( &entry, (char*)wine_ldt_get_base(&entry) + 0x10000);
 122         /* yep, Windows sets limit like that, not 64K sel units */
 123         wine_ldt_set_limit( &entry, wine_ldt_get_limit(&entry) - 0x10000 );
 124     }
 125 }
 126
 127
 128 /***********************************************************************
 129  *           SELECTOR_AllocBlock
 130  *
 131  * Allocate selectors for a block of linear memory.
 132  */
 133 WORD SELECTOR_AllocBlock( const void *base, DWORD size, unsigned char flags )
 134 {
 135     WORD sel, count;
 136
 137     if (!size) return 0;
 138     count = (size + 0xffff) / 0x10000;
 139     sel = wine_ldt_alloc_entries( count );
 140     if (sel) SELECTOR_SetEntries( sel, base, size, flags );
 141     return sel;
 142 }
 143
 144
 145 /***********************************************************************
 146  *           SELECTOR_FreeBlock
 147  *
 148  * Free a block of selectors.
 149  */
 150 void SELECTOR_FreeBlock( WORD sel )
 151 {
 152     WORD i, count = get_sel_count( sel );
 153
 154     TRACE("(%04x,%d)\n", sel, count );
 155     for (i = 0; i < count; i++) FreeSelector16( sel + (i << __AHSHIFT) );
 156 }
 157
 158
 159 /***********************************************************************
 160  *           SELECTOR_ReallocBlock
 161  *
 162  * Change the size of a block of selectors.
 163  */
 164 WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size )
 165 {
 166     LDT_ENTRY entry;
 167     int oldcount, newcount;
 168
 169     if (!size) size = 1;
 170     wine_ldt_get_entry( sel, &entry );
 171     oldcount = (wine_ldt_get_limit(&entry) >> 16) + 1;
 172     newcount = (size + 0xffff) >> 16;
 173
 174     sel = wine_ldt_realloc_entries( sel, oldcount, newcount );
 175     if (sel) SELECTOR_SetEntries( sel, base, size, wine_ldt_get_flags(&entry) );
 176     return sel;
 177 }
 178
 179
 180 /***********************************************************************
 181  *           PrestoChangoSelector   (KERNEL.177)
 182  */
 183 WORD WINAPI PrestoChangoSelector16( WORD selSrc, WORD selDst )
 184 {
 185     LDT_ENTRY entry;
 186     wine_ldt_get_entry( selSrc, &entry );
 187     /* toggle the executable bit */
 188     entry.HighWord.Bits.Type ^= (WINE_LDT_FLAGS_CODE ^ WINE_LDT_FLAGS_DATA);
 189     wine_ldt_set_entry( selDst, &entry );
 190     return selDst;
 191 }
 192
 193
 194 /***********************************************************************
 195  *           AllocCStoDSAlias   (KERNEL.170)
 196  *           AllocAlias         (KERNEL.172)
 197  */
 198 WORD WINAPI AllocCStoDSAlias16( WORD sel )
 199 {
 200     WORD newsel;
 201     LDT_ENTRY entry;
 202
 203     newsel = wine_ldt_alloc_entries( 1 );
 204     TRACE("(%04x): returning %04x\n",
 205                       sel, newsel );
 206     if (!newsel) return 0;
 207     wine_ldt_get_entry( sel, &entry );
 208     entry.HighWord.Bits.Type = WINE_LDT_FLAGS_DATA;
 209     wine_ldt_set_entry( newsel, &entry );
 210     return newsel;
 211 }
 212
 213
 214 /***********************************************************************
 215  *           AllocDStoCSAlias   (KERNEL.171)
 216  */
 217 WORD WINAPI AllocDStoCSAlias16( WORD sel )
 218 {
 219     WORD newsel;
 220     LDT_ENTRY entry;
 221
 222     newsel = wine_ldt_alloc_entries( 1 );
 223     TRACE("(%04x): returning %04x\n",
 224                       sel, newsel );
 225     if (!newsel) return 0;
 226     wine_ldt_get_entry( sel, &entry );
 227     entry.HighWord.Bits.Type = WINE_LDT_FLAGS_CODE;
 228     wine_ldt_set_entry( newsel, &entry );
 229     return newsel;
 230 }
 231
 232
 233 /***********************************************************************
 234  *           LongPtrAdd   (KERNEL.180)
 235  */
 236 void WINAPI LongPtrAdd16( DWORD ptr, DWORD add )
 237 {
 238     LDT_ENTRY entry;
 239     wine_ldt_get_entry( SELECTOROF(ptr), &entry );
 240     wine_ldt_set_base( &entry, (char *)wine_ldt_get_base(&entry) + add );
 241     wine_ldt_set_entry( SELECTOROF(ptr), &entry );
 242 }
 243
 244
 245 /***********************************************************************
 246  *             GetSelectorBase   (KERNEL.186)
 247  */
 248 DWORD WINAPI GetSelectorBase( WORD sel )
 249 {
 250     void *base = wine_ldt_copy.base[sel >> __AHSHIFT];
 251
 252     /* if base points into DOSMEM, assume we have to
 253      * return pointer into physical lower 1MB */
 254
 255     return DOSMEM_MapLinearToDos( base );
 256 }
 257
 258
 259 /***********************************************************************
 260  *             SetSelectorBase   (KERNEL.187)
 261  */
 262 WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
 263 {
 264     LDT_ENTRY entry;
 265     wine_ldt_get_entry( sel, &entry );
 266     wine_ldt_set_base( &entry, DOSMEM_MapDosToLinear(base) );
 267     wine_ldt_set_entry( sel, &entry );
 268     return sel;
 269 }
 270
 271
 272 /***********************************************************************
 273  *           GetSelectorLimit   (KERNEL.188)
 274  */
 275 DWORD WINAPI GetSelectorLimit16( WORD sel )
 276 {
 277     return wine_ldt_copy.limit[sel >> __AHSHIFT];
 278 }
 279
 280
 281 /***********************************************************************
 282  *           SetSelectorLimit   (KERNEL.189)
 283  */
 284 WORD WINAPI SetSelectorLimit16( WORD sel, DWORD limit )
 285 {
 286     LDT_ENTRY entry;
 287     wine_ldt_get_entry( sel, &entry );
 288     wine_ldt_set_limit( &entry, limit );
 289     wine_ldt_set_entry( sel, &entry );
 290     return sel;
 291 }
 292
 293
 294 /***********************************************************************
 295  *           SelectorAccessRights   (KERNEL.196)
 296  */
 297 WORD WINAPI SelectorAccessRights16( WORD sel, WORD op, WORD val )
 298 {
 299     LDT_ENTRY entry;
 300     wine_ldt_get_entry( sel, &entry );
 301
 302     if (op == 0)  /* get */
 303     {
 304         return entry.HighWord.Bytes.Flags1 | ((entry.HighWord.Bytes.Flags2 << 8) & 0xf0);
 305     }
 306     else  /* set */
 307     {
 308         entry.HighWord.Bytes.Flags1 = LOBYTE(val) | 0xf0;
 309         entry.HighWord.Bytes.Flags2 = (entry.HighWord.Bytes.Flags2 & 0x0f) | (HIBYTE(val) & 0xf0);
 310         wine_ldt_set_entry( sel, &entry );
 311         return 0;
 312     }
 313 }
 314
 315
 316 /***********************************************************************
 317  *           IsBadCodePtr   (KERNEL.336)
 318  */
 319 BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
 320 {
 321     WORD sel;
 322     LDT_ENTRY entry;
 323
 324     sel = SELECTOROF(lpfn);
 325     if (!sel) return TRUE;
 326     wine_ldt_get_entry( sel, &entry );
 327     if (wine_ldt_is_empty( &entry )) return TRUE;
 328     /* check for code segment, ignoring conforming, read-only and accessed bits */
 329     if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_CODE) & 0x18) return TRUE;
 330     if (OFFSETOF(lpfn) > wine_ldt_get_limit(&entry)) return TRUE;
 331     return FALSE;
 332 }
 333
 334
 335 /***********************************************************************
 336  *           IsBadStringPtr   (KERNEL.337)
 337  */
 338 BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
 339 {
 340     WORD sel;
 341     LDT_ENTRY entry;
 342
 343     sel = SELECTOROF(ptr);
 344     if (!sel) return TRUE;
 345     wine_ldt_get_entry( sel, &entry );
 346     if (wine_ldt_is_empty( &entry )) return TRUE;
 347     /* check for data or readable code segment */
 348     if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE;  /* system descriptor */
 349     if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE;  /* non-readable code segment */
 350     if (strlen(MapSL(ptr)) < size) size = strlen(MapSL(ptr)) + 1;
 351     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit(&entry))) return TRUE;
 352     return FALSE;
 353 }
 354
 355
 356 /***********************************************************************
 357  *           IsBadHugeReadPtr   (KERNEL.346)
 358  */
 359 BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
 360 {
 361     WORD sel;
 362     LDT_ENTRY entry;
 363
 364     sel = SELECTOROF(ptr);
 365     if (!sel) return TRUE;
 366     wine_ldt_get_entry( sel, &entry );
 367     if (wine_ldt_is_empty( &entry )) return TRUE;
 368     /* check for data or readable code segment */
 369     if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE;  /* system descriptor */
 370     if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE;  /* non-readable code segment */
 371     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
 372     return FALSE;
 373 }
 374
 375
 376 /***********************************************************************
 377  *           IsBadHugeWritePtr   (KERNEL.347)
 378  */
 379 BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
 380 {
 381     WORD sel;
 382     LDT_ENTRY entry;
 383
 384     sel = SELECTOROF(ptr);
 385     if (!sel) return TRUE;
 386     wine_ldt_get_entry( sel, &entry );
 387     if (wine_ldt_is_empty( &entry )) return TRUE;
 388     /* check for writeable data segment, ignoring expand-down and accessed flags */
 389     if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_DATA) & ~5) return TRUE;
 390     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
 391     return FALSE;
 392 }
 393
 394 /***********************************************************************
 395  *           IsBadReadPtr   (KERNEL.334)
 396  */
 397 BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
 398 {
 399     return IsBadHugeReadPtr16( ptr, size );
 400 }
 401
 402
 403 /***********************************************************************
 404  *           IsBadWritePtr   (KERNEL.335)
 405  */
 406 BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
 407 {
 408     return IsBadHugeWritePtr16( ptr, size );
 409 }
 410
 411
 412 /***********************************************************************
 413  *           IsBadFlatReadWritePtr   (KERNEL.627)
 414  */
 415 BOOL16 WINAPI IsBadFlatReadWritePtr16( SEGPTR ptr, DWORD size, BOOL16 bWrite )
 416 {
 417     return bWrite? IsBadHugeWritePtr16( ptr, size )
 418                  : IsBadHugeReadPtr16( ptr, size );
 419 }
 420
 421
 422 /***********************************************************************
 423  *           MemoryRead   (TOOLHELP.78)
 424  */
 425 DWORD WINAPI MemoryRead16( WORD sel, DWORD offset, void *buffer, DWORD count )
 426 {
 427     LDT_ENTRY entry;
 428     DWORD limit;
 429
 430     wine_ldt_get_entry( sel, &entry );
 431     if (wine_ldt_is_empty( &entry )) return 0;
 432     limit = wine_ldt_get_limit( &entry );
 433     if (offset > limit) return 0;
 434     if (offset + count > limit + 1) count = limit + 1 - offset;
 435     memcpy( buffer, (char *)wine_ldt_get_base(&entry) + offset, count );
 436     return count;
 437 }
 438
 439
 440 /***********************************************************************
 441  *           MemoryWrite   (TOOLHELP.79)
 442  */
 443 DWORD WINAPI MemoryWrite16( WORD sel, DWORD offset, void *buffer, DWORD count )
 444 {
 445     LDT_ENTRY entry;
 446     DWORD limit;
 447
 448     wine_ldt_get_entry( sel, &entry );
 449     if (wine_ldt_is_empty( &entry )) return 0;
 450     limit = wine_ldt_get_limit( &entry );
 451     if (offset > limit) return 0;
 452     if (offset + count > limit) count = limit + 1 - offset;
 453     memcpy( (char *)wine_ldt_get_base(&entry) + offset, buffer, count );
 454     return count;
 455 }
 456
 457 /************************************* Win95 pointer mapping functions *
 458  *
 459  */
 460
 461 struct mapls_entry
 462 {
 463     struct mapls_entry *next;
 464     void               *addr;   /* linear address */
 465     int                 count;  /* ref count */
 466     WORD                sel;    /* selector */
 467 };
 468
 469 static struct mapls_entry *first_entry;
 470
 471
 472 /***********************************************************************
 473  *           MapLS   (KERNEL32.@)
 474  *           MapLS   (KERNEL.358)
 475  *
 476  * Maps linear pointer to segmented.
 477  */
 478 SEGPTR WINAPI MapLS( LPCVOID ptr )
 479 {
 480     struct mapls_entry *entry, *free = NULL;
 481     const void *base;
 482     SEGPTR ret = 0;
 483
 484     if (!HIWORD(ptr)) return (SEGPTR)LOWORD(ptr);
 485
 486     base = (const char *)ptr - ((unsigned int)ptr & 0x7fff);
 487     HeapLock( GetProcessHeap() );
 488     for (entry = first_entry; entry; entry = entry->next)
 489     {
 490         if (entry->addr == base) break;
 491         if (!entry->count) free = entry;
 492     }
 493
 494     if (!entry)
 495     {
 496         if (!free)  /* no free entry found, create a new one */
 497         {
 498             if (!(free = HeapAlloc( GetProcessHeap(), 0, sizeof(*free) ))) goto done;
 499             if (!(free->sel = SELECTOR_AllocBlock( base, 0x10000, WINE_LDT_FLAGS_DATA )))
 500             {
 501                 HeapFree( GetProcessHeap(), 0, free );
 502                 goto done;
 503             }
 504             free->count = 0;
 505             free->next = first_entry;
 506             first_entry = free;
 507         }
 508         SetSelectorBase( free->sel, (DWORD)base );
 509         free->addr = (void*)base;
 510         entry = free;
 511     }
 512     entry->count++;
 513     ret = MAKESEGPTR( entry->sel, (const char *)ptr - (char *)entry->addr );
 514  done:
 515     HeapUnlock( GetProcessHeap() );
 516     return ret;
 517 }
 518
 519 /***********************************************************************
 520  *           UnMapLS   (KERNEL32.@)
 521  *           UnMapLS   (KERNEL.359)
 522  *
 523  * Free mapped selector.
 524  */
 525 void WINAPI UnMapLS( SEGPTR sptr )
 526 {
 527     struct mapls_entry *entry;
 528     WORD sel = SELECTOROF(sptr);
 529
 530     if (sel)
 531     {
 532         HeapLock( GetProcessHeap() );
 533         for (entry = first_entry; entry; entry = entry->next) if (entry->sel == sel) break;
 534         if (entry && entry->count > 0) entry->count--;
 535         HeapUnlock( GetProcessHeap() );
 536     }
 537 }
 538
 539 /***********************************************************************
 540  *           MapSL   (KERNEL32.@)
 541  *           MapSL   (KERNEL.357)
 542  *
 543  * Maps fixed segmented pointer to linear.
 544  */
 545 LPVOID WINAPI MapSL( SEGPTR sptr )
 546 {
 547     return (char *)wine_ldt_copy.base[SELECTOROF(sptr) >> __AHSHIFT] + OFFSETOF(sptr);
 548 }
 549
 550 /***********************************************************************
 551  *           MapSLFix   (KERNEL32.@)
 552  *
 553  * FIXME: MapSLFix and UnMapSLFixArray should probably prevent
 554  * unexpected linear address change when GlobalCompact() shuffles
 555  * moveable blocks.
 556  */
 557
 558 LPVOID WINAPI MapSLFix( SEGPTR sptr )
 559 {
 560     return MapSL(sptr);
 561 }
 562
 563 /***********************************************************************
 564  *           UnMapSLFixArray   (KERNEL32.@)
 565  *
 566  * Must not change EAX, hence defined as asm function.
 567  */
 568 #ifdef __i386__
 569 __ASM_GLOBAL_FUNC( UnMapSLFixArray, "ret $8" );
 570 #endif
 571
 572
 573 /***********************************************************************
 574  *           GetThreadSelectorEntry   (KERNEL32.@)
 575  */
 576 BOOL WINAPI GetThreadSelectorEntry( HANDLE hthread, DWORD sel, LPLDT_ENTRY ldtent)
 577 {
 578 #ifdef __i386__
 579     BOOL ret;
 580
 581     if (!(sel & 4))  /* GDT selector */
 582     {
 583         sel &= ~3;  /* ignore RPL */
 584         if (!sel)  /* null selector */
 585         {
 586             memset( ldtent, 0, sizeof(*ldtent) );
 587             return TRUE;
 588         }
 589         ldtent->BaseLow                   = 0;
 590         ldtent->HighWord.Bits.BaseMid     = 0;
 591         ldtent->HighWord.Bits.BaseHi      = 0;
 592         ldtent->LimitLow                  = 0xffff;
 593         ldtent->HighWord.Bits.LimitHi     = 0xf;
 594         ldtent->HighWord.Bits.Dpl         = 3;
 595         ldtent->HighWord.Bits.Sys         = 0;
 596         ldtent->HighWord.Bits.Pres        = 1;
 597         ldtent->HighWord.Bits.Granularity = 1;
 598         ldtent->HighWord.Bits.Default_Big = 1;
 599         ldtent->HighWord.Bits.Type        = 0x12;
 600         /* it has to be one of the system GDT selectors */
 601         if (sel == (wine_get_ds() & ~3)) return TRUE;
 602         if (sel == (wine_get_ss() & ~3)) return TRUE;
 603         if (sel == (wine_get_cs() & ~3))
 604         {
 605             ldtent->HighWord.Bits.Type |= 8;  /* code segment */
 606             return TRUE;
 607         }
 608         SetLastError( ERROR_NOACCESS );
 609         return FALSE;
 610     }
 611
 612     SERVER_START_REQ( get_selector_entry )
 613     {
 614         req->handle = hthread;
 615         req->entry = sel >> __AHSHIFT;
 616         if ((ret = !wine_server_call_err( req )))
 617         {
 618             if (!(reply->flags & WINE_LDT_FLAGS_ALLOCATED))
 619             {
 620                 SetLastError( ERROR_MR_MID_NOT_FOUND );  /* sic */
 621                 ret = FALSE;
 622             }
 623             else
 624             {
 625                 wine_ldt_set_base( ldtent, (void *)reply->base );
 626                 wine_ldt_set_limit( ldtent, reply->limit );
 627                 wine_ldt_set_flags( ldtent, reply->flags );
 628             }
 629         }
 630     }
 631     SERVER_END_REQ;
 632     return ret;
 633 #else
 634     SetLastError( ERROR_CALL_NOT_IMPLEMENTED );
 635     return FALSE;
 636 #endif
 637 }
 638
 639
 640 #ifdef __i386__
 641
 642 /***********************************************************************
 643  *              SMapLS (KERNEL32.@)
 644  */
 645 __ASM_GLOBAL_FUNC( SMapLS,
 646                    "xor %edx,%edx\n\t"
 647                    "testl $0xffff0000,%eax\n\t"
 648                    "jz 1f\n\t"
 649                    "pushl %eax\n\t"
 650                    "call " __ASM_NAME("MapLS") "\n\t"
 651                    "movl %eax,%edx\n"
 652                    "1:\tret" );
 653
 654 /***********************************************************************
 655  *              SUnMapLS (KERNEL32.@)
 656  */
 657 __ASM_GLOBAL_FUNC( SUnMapLS,
 658                    "pushl %eax\n\t"  /* preserve eax */
 659                    "pushl %eax\n\t"
 660                    "call " __ASM_NAME("UnMapLS") "\n\t"
 661                    "popl %eax\n\t"
 662                    "ret" );
 663
 664 /***********************************************************************
 665  *              SMapLS_IP_EBP_8 (KERNEL32.@)
 666  *              SMapLS_IP_EBP_12 (KERNEL32.@)
 667  *              SMapLS_IP_EBP_16 (KERNEL32.@)
 668  *              SMapLS_IP_EBP_20 (KERNEL32.@)
 669  *              SMapLS_IP_EBP_24 (KERNEL32.@)
 670  *              SMapLS_IP_EBP_28 (KERNEL32.@)
 671  *              SMapLS_IP_EBP_32 (KERNEL32.@)
 672  *              SMapLS_IP_EBP_36 (KERNEL32.@)
 673  *              SMapLS_IP_EBP_40 (KERNEL32.@)
 674  *
 675  * These functions map linear pointers at [EBP+xxx] to segmented pointers
 676  * and return them.
 677  * Win95 uses some kind of alias structs, which it stores in [EBP+x] to
 678  * unravel them at SUnMapLS. We just store the segmented pointer there.
 679  */
 680 #define DEFINE_SMapLS(n) \
 681   __ASM_GLOBAL_FUNC( SMapLS_IP_EBP_ ## n, \
 682                      "movl " #n "(%ebp),%eax\n\t" \
 683                      "call " __ASM_NAME("SMapLS") "\n\t" \
 684                      "movl %edx," #n "(%ebp)\n\t" \
 685                      "ret" );
 686
 687 DEFINE_SMapLS(8);
 688 DEFINE_SMapLS(12);
 689 DEFINE_SMapLS(16);
 690 DEFINE_SMapLS(20);
 691 DEFINE_SMapLS(24);
 692 DEFINE_SMapLS(28);
 693 DEFINE_SMapLS(32);
 694 DEFINE_SMapLS(36);
 695 DEFINE_SMapLS(40);
 696
 697
 698 /***********************************************************************
 699  *              SUnMapLS_IP_EBP_8 (KERNEL32.@)
 700  *              SUnMapLS_IP_EBP_12 (KERNEL32.@)
 701  *              SUnMapLS_IP_EBP_16 (KERNEL32.@)
 702  *              SUnMapLS_IP_EBP_20 (KERNEL32.@)
 703  *              SUnMapLS_IP_EBP_24 (KERNEL32.@)
 704  *              SUnMapLS_IP_EBP_28 (KERNEL32.@)
 705  *              SUnMapLS_IP_EBP_32 (KERNEL32.@)
 706  *              SUnMapLS_IP_EBP_36 (KERNEL32.@)
 707  *              SUnMapLS_IP_EBP_40 (KERNEL32.@)
 708  */
 709
 710 #define DEFINE_SUnMapLS(n) \
 711   __ASM_GLOBAL_FUNC( SUnMapLS_IP_EBP_ ## n, \
 712                      "pushl %eax\n\t"  /* preserve eax */ \
 713                      "pushl " #n "(%ebp)\n\t" \
 714                      "call " __ASM_NAME("UnMapLS") "\n\t" \
 715                      "movl $0," #n "(%ebp)\n\t" \
 716                      "popl %eax\n\t" \
 717                      "ret" )
 718
 719 DEFINE_SUnMapLS(8);
 720 DEFINE_SUnMapLS(12);
 721 DEFINE_SUnMapLS(16);
 722 DEFINE_SUnMapLS(20);
 723 DEFINE_SUnMapLS(24);
 724 DEFINE_SUnMapLS(28);
 725 DEFINE_SUnMapLS(32);
 726 DEFINE_SUnMapLS(36);
 727 DEFINE_SUnMapLS(40);
 728
 729 #endif  /* __i386__ */