memory/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 "miscemu.h"
  29 #include "selectors.h"
  30 #include "stackframe.h"
  31 #include "wine/server.h"
  32 #include "wine/debug.h"
  33 #include "toolhelp.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(selector);
  36
  37 #define LDT_SIZE 8192
  38
  39 /* get the number of selectors needed to cover up to the selector limit */
  40 inline static WORD get_sel_count( WORD sel )
  41 {
  42     return (wine_ldt_copy.limit[sel >> __AHSHIFT] >> 16) + 1;
  43 }
  44
  45
  46 /***********************************************************************
  47  *           AllocSelectorArray   (KERNEL.206)
  48  */
  49 WORD WINAPI AllocSelectorArray16( WORD count )
  50 {
  51     WORD i, sel = wine_ldt_alloc_entries( count );
  52
  53     if (sel)
  54     {
  55         LDT_ENTRY entry;
  56         wine_ldt_set_base( &entry, 0 );
  57         wine_ldt_set_limit( &entry, 1 ); /* avoid 0 base and limit */
  58         wine_ldt_set_flags( &entry, WINE_LDT_FLAGS_DATA );
  59         for (i = 0; i < count; i++) wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
  60     }
  61     return sel;
  62 }
  63
  64
  65 /***********************************************************************
  66  *           AllocSelector   (KERNEL.175)
  67  */
  68 WORD WINAPI AllocSelector16( WORD sel )
  69 {
  70     WORD newsel, count, i;
  71
  72     count = sel ? get_sel_count(sel) : 1;
  73     newsel = wine_ldt_alloc_entries( count );
  74     TRACE("(%04x): returning %04x\n", sel, newsel );
  75     if (!newsel) return 0;
  76     if (!sel) return newsel;  /* nothing to copy */
  77     for (i = 0; i < count; i++)
  78     {
  79         LDT_ENTRY entry;
  80         wine_ldt_get_entry( sel + (i << __AHSHIFT), &entry );
  81         wine_ldt_set_entry( newsel + (i << __AHSHIFT), &entry );
  82     }
  83     return newsel;
  84 }
  85
  86
  87 /***********************************************************************
  88  *           FreeSelector   (KERNEL.176)
  89  */
  90 WORD WINAPI FreeSelector16( WORD sel )
  91 {
  92     LDT_ENTRY entry;
  93
  94     wine_ldt_get_entry( sel, &entry );
  95     if (wine_ldt_is_empty( &entry )) return sel;  /* error */
  96 #ifdef __i386__
  97     /* Check if we are freeing current %fs selector */
  98     if (!((wine_get_fs() ^ sel) & ~3))
  99         WARN("Freeing %%fs selector (%04x), not good.\n", wine_get_fs() );
 100 #endif  /* __i386__ */
 101     wine_ldt_free_entries( sel, 1 );
 102     return 0;
 103 }
 104
 105
 106 /***********************************************************************
 107  *           SELECTOR_SetEntries
 108  *
 109  * Set the LDT entries for an array of selectors.
 110  */
 111 static void SELECTOR_SetEntries( WORD sel, const void *base, DWORD size, unsigned char flags )
 112 {
 113     LDT_ENTRY entry;
 114     WORD i, count;
 115
 116     wine_ldt_set_base( &entry, base );
 117     wine_ldt_set_limit( &entry, size - 1 );
 118     wine_ldt_set_flags( &entry, flags );
 119     count = (size + 0xffff) / 0x10000;
 120     for (i = 0; i < count; i++)
 121     {
 122         wine_ldt_set_entry( sel + (i << __AHSHIFT), &entry );
 123         wine_ldt_set_base( &entry, (char*)wine_ldt_get_base(&entry) + 0x10000);
 124         /* yep, Windows sets limit like that, not 64K sel units */
 125         wine_ldt_set_limit( &entry, wine_ldt_get_limit(&entry) - 0x10000 );
 126     }
 127 }
 128
 129
 130 /***********************************************************************
 131  *           SELECTOR_AllocBlock
 132  *
 133  * Allocate selectors for a block of linear memory.
 134  */
 135 WORD SELECTOR_AllocBlock( const void *base, DWORD size, unsigned char flags )
 136 {
 137     WORD sel, count;
 138
 139     if (!size) return 0;
 140     count = (size + 0xffff) / 0x10000;
 141     sel = wine_ldt_alloc_entries( count );
 142     if (sel) SELECTOR_SetEntries( sel, base, size, flags );
 143     return sel;
 144 }
 145
 146
 147 /***********************************************************************
 148  *           SELECTOR_FreeBlock
 149  *
 150  * Free a block of selectors.
 151  */
 152 void SELECTOR_FreeBlock( WORD sel )
 153 {
 154     WORD i, count = get_sel_count( sel );
 155
 156     TRACE("(%04x,%d)\n", sel, count );
 157     for (i = 0; i < count; i++) FreeSelector16( sel + (i << __AHSHIFT) );
 158 }
 159
 160
 161 /***********************************************************************
 162  *           SELECTOR_ReallocBlock
 163  *
 164  * Change the size of a block of selectors.
 165  */
 166 WORD SELECTOR_ReallocBlock( WORD sel, const void *base, DWORD size )
 167 {
 168     LDT_ENTRY entry;
 169     int oldcount, newcount;
 170
 171     if (!size) size = 1;
 172     wine_ldt_get_entry( sel, &entry );
 173     oldcount = (wine_ldt_get_limit(&entry) >> 16) + 1;
 174     newcount = (size + 0xffff) >> 16;
 175
 176     sel = wine_ldt_realloc_entries( sel, oldcount, newcount );
 177     if (sel) SELECTOR_SetEntries( sel, base, size, wine_ldt_get_flags(&entry) );
 178     return sel;
 179 }
 180
 181
 182 /***********************************************************************
 183  *           PrestoChangoSelector   (KERNEL.177)
 184  */
 185 WORD WINAPI PrestoChangoSelector16( WORD selSrc, WORD selDst )
 186 {
 187     LDT_ENTRY entry;
 188     wine_ldt_get_entry( selSrc, &entry );
 189     /* toggle the executable bit */
 190     entry.HighWord.Bits.Type ^= (WINE_LDT_FLAGS_CODE ^ WINE_LDT_FLAGS_DATA);
 191     wine_ldt_set_entry( selDst, &entry );
 192     return selDst;
 193 }
 194
 195
 196 /***********************************************************************
 197  *           AllocCStoDSAlias   (KERNEL.170)
 198  *           AllocAlias         (KERNEL.172)
 199  */
 200 WORD WINAPI AllocCStoDSAlias16( WORD sel )
 201 {
 202     WORD newsel;
 203     LDT_ENTRY entry;
 204
 205     newsel = wine_ldt_alloc_entries( 1 );
 206     TRACE("(%04x): returning %04x\n",
 207                       sel, newsel );
 208     if (!newsel) return 0;
 209     wine_ldt_get_entry( sel, &entry );
 210     entry.HighWord.Bits.Type = WINE_LDT_FLAGS_DATA;
 211     wine_ldt_set_entry( newsel, &entry );
 212     return newsel;
 213 }
 214
 215
 216 /***********************************************************************
 217  *           AllocDStoCSAlias   (KERNEL.171)
 218  */
 219 WORD WINAPI AllocDStoCSAlias16( WORD sel )
 220 {
 221     WORD newsel;
 222     LDT_ENTRY entry;
 223
 224     newsel = wine_ldt_alloc_entries( 1 );
 225     TRACE("(%04x): returning %04x\n",
 226                       sel, newsel );
 227     if (!newsel) return 0;
 228     wine_ldt_get_entry( sel, &entry );
 229     entry.HighWord.Bits.Type = WINE_LDT_FLAGS_CODE;
 230     wine_ldt_set_entry( newsel, &entry );
 231     return newsel;
 232 }
 233
 234
 235 /***********************************************************************
 236  *           LongPtrAdd   (KERNEL.180)
 237  */
 238 void WINAPI LongPtrAdd16( DWORD ptr, DWORD add )
 239 {
 240     LDT_ENTRY entry;
 241     wine_ldt_get_entry( SELECTOROF(ptr), &entry );
 242     wine_ldt_set_base( &entry, (char *)wine_ldt_get_base(&entry) + add );
 243     wine_ldt_set_entry( SELECTOROF(ptr), &entry );
 244 }
 245
 246
 247 /***********************************************************************
 248  *             GetSelectorBase   (KERNEL.186)
 249  */
 250 DWORD WINAPI GetSelectorBase( WORD sel )
 251 {
 252     void *base = wine_ldt_copy.base[sel >> __AHSHIFT];
 253
 254     /* if base points into DOSMEM, assume we have to
 255      * return pointer into physical lower 1MB */
 256
 257     return DOSMEM_MapLinearToDos( base );
 258 }
 259
 260
 261 /***********************************************************************
 262  *             SetSelectorBase   (KERNEL.187)
 263  */
 264 WORD WINAPI SetSelectorBase( WORD sel, DWORD base )
 265 {
 266     LDT_ENTRY entry;
 267     wine_ldt_get_entry( sel, &entry );
 268     wine_ldt_set_base( &entry, DOSMEM_MapDosToLinear(base) );
 269     wine_ldt_set_entry( sel, &entry );
 270     return sel;
 271 }
 272
 273
 274 /***********************************************************************
 275  *           GetSelectorLimit   (KERNEL.188)
 276  */
 277 DWORD WINAPI GetSelectorLimit16( WORD sel )
 278 {
 279     return wine_ldt_copy.limit[sel >> __AHSHIFT];
 280 }
 281
 282
 283 /***********************************************************************
 284  *           SetSelectorLimit   (KERNEL.189)
 285  */
 286 WORD WINAPI SetSelectorLimit16( WORD sel, DWORD limit )
 287 {
 288     LDT_ENTRY entry;
 289     wine_ldt_get_entry( sel, &entry );
 290     wine_ldt_set_limit( &entry, limit );
 291     wine_ldt_set_entry( sel, &entry );
 292     return sel;
 293 }
 294
 295
 296 /***********************************************************************
 297  *           SelectorAccessRights   (KERNEL.196)
 298  */
 299 WORD WINAPI SelectorAccessRights16( WORD sel, WORD op, WORD val )
 300 {
 301     LDT_ENTRY entry;
 302     wine_ldt_get_entry( sel, &entry );
 303
 304     if (op == 0)  /* get */
 305     {
 306         return entry.HighWord.Bytes.Flags1 | ((entry.HighWord.Bytes.Flags2 << 8) & 0xf0);
 307     }
 308     else  /* set */
 309     {
 310         entry.HighWord.Bytes.Flags1 = LOBYTE(val) | 0xf0;
 311         entry.HighWord.Bytes.Flags2 = (entry.HighWord.Bytes.Flags2 & 0x0f) | (HIBYTE(val) & 0xf0);
 312         wine_ldt_set_entry( sel, &entry );
 313         return 0;
 314     }
 315 }
 316
 317
 318 /***********************************************************************
 319  *           IsBadCodePtr   (KERNEL.336)
 320  */
 321 BOOL16 WINAPI IsBadCodePtr16( SEGPTR lpfn )
 322 {
 323     WORD sel;
 324     LDT_ENTRY entry;
 325
 326     sel = SELECTOROF(lpfn);
 327     if (!sel) return TRUE;
 328     wine_ldt_get_entry( sel, &entry );
 329     if (wine_ldt_is_empty( &entry )) return TRUE;
 330     /* check for code segment, ignoring conforming, read-only and accessed bits */
 331     if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_CODE) & 0x18) return TRUE;
 332     if (OFFSETOF(lpfn) > wine_ldt_get_limit(&entry)) return TRUE;
 333     return FALSE;
 334 }
 335
 336
 337 /***********************************************************************
 338  *           IsBadStringPtr   (KERNEL.337)
 339  */
 340 BOOL16 WINAPI IsBadStringPtr16( SEGPTR ptr, UINT16 size )
 341 {
 342     WORD sel;
 343     LDT_ENTRY entry;
 344
 345     sel = SELECTOROF(ptr);
 346     if (!sel) return TRUE;
 347     wine_ldt_get_entry( sel, &entry );
 348     if (wine_ldt_is_empty( &entry )) return TRUE;
 349     /* check for data or readable code segment */
 350     if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE;  /* system descriptor */
 351     if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE;  /* non-readable code segment */
 352     if (strlen(MapSL(ptr)) < size) size = strlen(MapSL(ptr)) + 1;
 353     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit(&entry))) return TRUE;
 354     return FALSE;
 355 }
 356
 357
 358 /***********************************************************************
 359  *           IsBadHugeReadPtr   (KERNEL.346)
 360  */
 361 BOOL16 WINAPI IsBadHugeReadPtr16( SEGPTR ptr, DWORD size )
 362 {
 363     WORD sel;
 364     LDT_ENTRY entry;
 365
 366     sel = SELECTOROF(ptr);
 367     if (!sel) return TRUE;
 368     wine_ldt_get_entry( sel, &entry );
 369     if (wine_ldt_is_empty( &entry )) return TRUE;
 370     /* check for data or readable code segment */
 371     if (!(entry.HighWord.Bits.Type & 0x10)) return TRUE;  /* system descriptor */
 372     if ((entry.HighWord.Bits.Type & 0x0a) == 0x08) return TRUE;  /* non-readable code segment */
 373     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
 374     return FALSE;
 375 }
 376
 377
 378 /***********************************************************************
 379  *           IsBadHugeWritePtr   (KERNEL.347)
 380  */
 381 BOOL16 WINAPI IsBadHugeWritePtr16( SEGPTR ptr, DWORD size )
 382 {
 383     WORD sel;
 384     LDT_ENTRY entry;
 385
 386     sel = SELECTOROF(ptr);
 387     if (!sel) return TRUE;
 388     wine_ldt_get_entry( sel, &entry );
 389     if (wine_ldt_is_empty( &entry )) return TRUE;
 390     /* check for writeable data segment, ignoring expand-down and accessed flags */
 391     if ((entry.HighWord.Bits.Type ^ WINE_LDT_FLAGS_DATA) & ~5) return TRUE;
 392     if (size && (OFFSETOF(ptr) + size - 1 > wine_ldt_get_limit( &entry ))) return TRUE;
 393     return FALSE;
 394 }
 395
 396 /***********************************************************************
 397  *           IsBadReadPtr   (KERNEL.334)
 398  */
 399 BOOL16 WINAPI IsBadReadPtr16( SEGPTR ptr, UINT16 size )
 400 {
 401     return IsBadHugeReadPtr16( ptr, size );
 402 }
 403
 404
 405 /***********************************************************************
 406  *           IsBadWritePtr   (KERNEL.335)
 407  */
 408 BOOL16 WINAPI IsBadWritePtr16( SEGPTR ptr, UINT16 size )
 409 {
 410     return IsBadHugeWritePtr16( ptr, size );
 411 }
 412
 413
 414 /***********************************************************************
 415  *           IsBadFlatReadWritePtr   (KERNEL.627)
 416  */
 417 BOOL16 WINAPI IsBadFlatReadWritePtr16( SEGPTR ptr, DWORD size, BOOL16 bWrite )
 418 {
 419     return bWrite? IsBadHugeWritePtr16( ptr, size )
 420                  : IsBadHugeReadPtr16( ptr, size );
 421 }
 422
 423
 424 /***********************************************************************
 425  *           MemoryRead   (TOOLHELP.78)
 426  */
 427 DWORD WINAPI MemoryRead16( WORD sel, DWORD offset, void *buffer, DWORD count )
 428 {
 429     LDT_ENTRY entry;
 430     DWORD limit;
 431
 432     wine_ldt_get_entry( sel, &entry );
 433     if (wine_ldt_is_empty( &entry )) return 0;
 434     limit = wine_ldt_get_limit( &entry );
 435     if (offset > limit) return 0;
 436     if (offset + count > limit + 1) count = limit + 1 - offset;
 437     memcpy( buffer, (char *)wine_ldt_get_base(&entry) + offset, count );
 438     return count;
 439 }
 440
 441
 442 /***********************************************************************
 443  *           MemoryWrite   (TOOLHELP.79)
 444  */
 445 DWORD WINAPI MemoryWrite16( WORD sel, DWORD offset, void *buffer, DWORD count )
 446 {
 447     LDT_ENTRY entry;
 448     DWORD limit;
 449
 450     wine_ldt_get_entry( sel, &entry );
 451     if (wine_ldt_is_empty( &entry )) return 0;
 452     limit = wine_ldt_get_limit( &entry );
 453     if (offset > limit) return 0;
 454     if (offset + count > limit) count = limit + 1 - offset;
 455     memcpy( (char *)wine_ldt_get_base(&entry) + offset, buffer, count );
 456     return count;
 457 }
 458
 459 /************************************* Win95 pointer mapping functions *
 460  *
 461  */
 462
 463 struct mapls_entry
 464 {
 465     struct mapls_entry *next;
 466     void               *addr;   /* linear address */
 467     int                 count;  /* ref count */
 468     WORD                sel;    /* selector */
 469 };
 470
 471 static struct mapls_entry *first_entry;
 472
 473
 474 /***********************************************************************
 475  *           MapLS   (KERNEL32.@)
 476  *           MapLS   (KERNEL.358)
 477  *
 478  * Maps linear pointer to segmented.
 479  */
 480 SEGPTR WINAPI MapLS( LPCVOID ptr )
 481 {
 482     struct mapls_entry *entry, *free = NULL;
 483     void *base;
 484     SEGPTR ret = 0;
 485
 486     if (!HIWORD(ptr)) return (SEGPTR)ptr;
 487
 488     base = (char *)ptr - ((unsigned int)ptr & 0x7fff);
 489     HeapLock( GetProcessHeap() );
 490     for (entry = first_entry; entry; entry = entry->next)
 491     {
 492         if (entry->addr == base) break;
 493         if (!entry->count) free = entry;
 494     }
 495
 496     if (!entry)
 497     {
 498         if (!free)  /* no free entry found, create a new one */
 499         {
 500             if (!(free = HeapAlloc( GetProcessHeap(), 0, sizeof(*free) ))) goto done;
 501             if (!(free->sel = SELECTOR_AllocBlock( base, 0x10000, WINE_LDT_FLAGS_DATA )))
 502             {
 503                 HeapFree( GetProcessHeap(), 0, free );
 504                 goto done;
 505             }
 506             free->count = 0;
 507             free->next = first_entry;
 508             first_entry = free;
 509         }
 510         SetSelectorBase( free->sel, (DWORD)base );
 511         free->addr = base;
 512         entry = free;
 513     }
 514     entry->count++;
 515     ret = MAKESEGPTR( entry->sel, (char *)ptr - (char *)entry->addr );
 516  done:
 517     HeapUnlock( GetProcessHeap() );
 518     return ret;
 519 }
 520
 521 /***********************************************************************
 522  *           UnMapLS   (KERNEL32.@)
 523  *           UnMapLS   (KERNEL.359)
 524  *
 525  * Free mapped selector.
 526  */
 527 void WINAPI UnMapLS( SEGPTR sptr )
 528 {
 529     struct mapls_entry *entry;
 530     WORD sel = SELECTOROF(sptr);
 531
 532     if (sel)
 533     {
 534         HeapLock( GetProcessHeap() );
 535         for (entry = first_entry; entry; entry = entry->next) if (entry->sel == sel) break;
 536         if (entry && entry->count > 0) entry->count--;
 537         HeapUnlock( GetProcessHeap() );
 538     }
 539 }
 540
 541 /***********************************************************************
 542  *           MapSL   (KERNEL32.@)
 543  *           MapSL   (KERNEL.357)
 544  *
 545  * Maps fixed segmented pointer to linear.
 546  */
 547 LPVOID WINAPI MapSL( SEGPTR sptr )
 548 {
 549     return (char *)wine_ldt_copy.base[SELECTOROF(sptr) >> __AHSHIFT] + OFFSETOF(sptr);
 550 }
 551
 552 /***********************************************************************
 553  *           MapSLFix   (KERNEL32.@)
 554  *
 555  * FIXME: MapSLFix and UnMapSLFixArray should probably prevent
 556  * unexpected linear address change when GlobalCompact() shuffles
 557  * moveable blocks.
 558  */
 559
 560 LPVOID WINAPI MapSLFix( SEGPTR sptr )
 561 {
 562     return MapSL(sptr);
 563 }
 564
 565 /***********************************************************************
 566  *           UnMapSLFixArray   (KERNEL32.@)
 567  */
 568
 569 void WINAPI UnMapSLFixArray( SEGPTR sptr[], INT length, CONTEXT86 *context )
 570 {
 571     /* Must not change EAX, hence defined as 'register' function */
 572 }
 573
 574 /***********************************************************************
 575  *           GetThreadSelectorEntry   (KERNEL32.@)
 576  */
 577 BOOL WINAPI GetThreadSelectorEntry( HANDLE hthread, DWORD sel, LPLDT_ENTRY ldtent)
 578 {
 579 #ifdef __i386__
 580     BOOL ret;
 581
 582     if (!(sel & 4))  /* GDT selector */
 583     {
 584         sel &= ~3;  /* ignore RPL */
 585         if (!sel)  /* null selector */
 586         {
 587             memset( ldtent, 0, sizeof(*ldtent) );
 588             return TRUE;
 589         }
 590         ldtent->BaseLow                   = 0;
 591         ldtent->HighWord.Bits.BaseMid     = 0;
 592         ldtent->HighWord.Bits.BaseHi      = 0;
 593         ldtent->LimitLow                  = 0xffff;
 594         ldtent->HighWord.Bits.LimitHi     = 0xf;
 595         ldtent->HighWord.Bits.Dpl         = 3;
 596         ldtent->HighWord.Bits.Sys         = 0;
 597         ldtent->HighWord.Bits.Pres        = 1;
 598         ldtent->HighWord.Bits.Granularity = 1;
 599         ldtent->HighWord.Bits.Default_Big = 1;
 600         ldtent->HighWord.Bits.Type        = 0x12;
 601         /* it has to be one of the system GDT selectors */
 602         if (sel == (wine_get_ds() & ~3)) return TRUE;
 603         if (sel == (wine_get_ss() & ~3)) return TRUE;
 604         if (sel == (wine_get_cs() & ~3))
 605         {
 606             ldtent->HighWord.Bits.Type |= 8;  /* code segment */
 607             return TRUE;
 608         }
 609         SetLastError( ERROR_NOACCESS );
 610         return FALSE;
 611     }
 612
 613     SERVER_START_REQ( get_selector_entry )
 614     {
 615         req->handle = hthread;
 616         req->entry = sel >> __AHSHIFT;
 617         if ((ret = !wine_server_call_err( req )))
 618         {
 619             if (!(reply->flags & WINE_LDT_FLAGS_ALLOCATED))
 620             {
 621                 SetLastError( ERROR_MR_MID_NOT_FOUND );  /* sic */
 622                 ret = FALSE;
 623             }
 624             else
 625             {
 626                 wine_ldt_set_base( ldtent, (void *)reply->base );
 627                 wine_ldt_set_limit( ldtent, reply->limit );
 628                 wine_ldt_set_flags( ldtent, reply->flags );
 629             }
 630         }
 631     }
 632     SERVER_END_REQ;
 633     return ret;
 634 #else
 635     SetLastError( ERROR_CALL_NOT_IMPLEMENTED );
 636     return FALSE;
 637 #endif
 638 }
 639
 640
 641 /**********************************************************************
 642  *              SMapLS*         (KERNEL32)
 643  * These functions map linear pointers at [EBP+xxx] to segmented pointers
 644  * and return them.
 645  * Win95 uses some kind of alias structs, which it stores in [EBP+x] to
 646  * unravel them at SUnMapLS. We just store the segmented pointer there.
 647  */
 648 static void
 649 x_SMapLS_IP_EBP_x(CONTEXT86 *context,int argoff) {
 650     DWORD       val,ptr;
 651
 652     val =*(DWORD*)(context->Ebp + argoff);
 653     if (val<0x10000) {
 654         ptr=val;
 655         *(DWORD*)(context->Ebp + argoff) = 0;
 656     } else {
 657         ptr = MapLS((LPVOID)val);
 658         *(DWORD*)(context->Ebp + argoff) = ptr;
 659     }
 660     context->Eax = ptr;
 661 }
 662
 663 /***********************************************************************
 664  *              SMapLS_IP_EBP_8 (KERNEL32.@)
 665  */
 666 void WINAPI SMapLS_IP_EBP_8 (CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context, 8);}
 667
 668 /***********************************************************************
 669  *              SMapLS_IP_EBP_12 (KERNEL32.@)
 670  */
 671 void WINAPI SMapLS_IP_EBP_12(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,12);}
 672
 673 /***********************************************************************
 674  *              SMapLS_IP_EBP_16 (KERNEL32.@)
 675  */
 676 void WINAPI SMapLS_IP_EBP_16(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,16);}
 677
 678 /***********************************************************************
 679  *              SMapLS_IP_EBP_20 (KERNEL32.@)
 680  */
 681 void WINAPI SMapLS_IP_EBP_20(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,20);}
 682
 683 /***********************************************************************
 684  *              SMapLS_IP_EBP_24 (KERNEL32.@)
 685  */
 686 void WINAPI SMapLS_IP_EBP_24(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,24);}
 687
 688 /***********************************************************************
 689  *              SMapLS_IP_EBP_28 (KERNEL32.@)
 690  */
 691 void WINAPI SMapLS_IP_EBP_28(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,28);}
 692
 693 /***********************************************************************
 694  *              SMapLS_IP_EBP_32 (KERNEL32.@)
 695  */
 696 void WINAPI SMapLS_IP_EBP_32(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,32);}
 697
 698 /***********************************************************************
 699  *              SMapLS_IP_EBP_36 (KERNEL32.@)
 700  */
 701 void WINAPI SMapLS_IP_EBP_36(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,36);}
 702
 703 /***********************************************************************
 704  *              SMapLS_IP_EBP_40 (KERNEL32.@)
 705  */
 706 void WINAPI SMapLS_IP_EBP_40(CONTEXT86 *context) {x_SMapLS_IP_EBP_x(context,40);}
 707
 708 /***********************************************************************
 709  *              SMapLS (KERNEL32.@)
 710  */
 711 void WINAPI SMapLS( CONTEXT86 *context )
 712 {
 713     if (HIWORD(context->Eax))
 714     {
 715         context->Eax = MapLS( (LPVOID)context->Eax );
 716         context->Edx = context->Eax;
 717     } else {
 718         context->Edx = 0;
 719     }
 720 }
 721
 722 /***********************************************************************
 723  *              SUnMapLS (KERNEL32.@)
 724  */
 725
 726 void WINAPI SUnMapLS( CONTEXT86 *context )
 727 {
 728     if (HIWORD(context->Eax)) UnMapLS( (SEGPTR)context->Eax );
 729 }
 730
 731 inline static void x_SUnMapLS_IP_EBP_x(CONTEXT86 *context,int argoff)
 732 {
 733     SEGPTR *ptr = (SEGPTR *)(context->Ebp + argoff);
 734     if (*ptr)
 735     {
 736         UnMapLS( *ptr );
 737         *ptr = 0;
 738     }
 739 }
 740
 741 /***********************************************************************
 742  *              SUnMapLS_IP_EBP_8 (KERNEL32.@)
 743  */
 744 void WINAPI SUnMapLS_IP_EBP_8 (CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context, 8); }
 745
 746 /***********************************************************************
 747  *              SUnMapLS_IP_EBP_12 (KERNEL32.@)
 748  */
 749 void WINAPI SUnMapLS_IP_EBP_12(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,12); }
 750
 751 /***********************************************************************
 752  *              SUnMapLS_IP_EBP_16 (KERNEL32.@)
 753  */
 754 void WINAPI SUnMapLS_IP_EBP_16(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,16); }
 755
 756 /***********************************************************************
 757  *              SUnMapLS_IP_EBP_20 (KERNEL32.@)
 758  */
 759 void WINAPI SUnMapLS_IP_EBP_20(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,20); }
 760
 761 /***********************************************************************
 762  *              SUnMapLS_IP_EBP_24 (KERNEL32.@)
 763  */
 764 void WINAPI SUnMapLS_IP_EBP_24(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,24); }
 765
 766 /***********************************************************************
 767  *              SUnMapLS_IP_EBP_28 (KERNEL32.@)
 768  */
 769 void WINAPI SUnMapLS_IP_EBP_28(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,28); }
 770
 771 /***********************************************************************
 772  *              SUnMapLS_IP_EBP_32 (KERNEL32.@)
 773  */
 774 void WINAPI SUnMapLS_IP_EBP_32(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,32); }
 775
 776 /***********************************************************************
 777  *              SUnMapLS_IP_EBP_36 (KERNEL32.@)
 778  */
 779 void WINAPI SUnMapLS_IP_EBP_36(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,36); }
 780
 781 /***********************************************************************
 782  *              SUnMapLS_IP_EBP_40 (KERNEL32.@)
 783  */
 784 void WINAPI SUnMapLS_IP_EBP_40(CONTEXT86 *context) { x_SUnMapLS_IP_EBP_x(context,40); }
 785
 786 /**********************************************************************
 787  *              AllocMappedBuffer       (KERNEL32.38)
 788  *
 789  * This is a undocumented KERNEL32 function that
 790  * SMapLS's a GlobalAlloc'ed buffer.
 791  *
 792  * Input:   EDI register: size of buffer to allocate
 793  * Output:  EDI register: pointer to buffer
 794  *
 795  * Note: The buffer is preceded by 8 bytes:
 796  *        ...
 797  *       edi+0   buffer
 798  *       edi-4   SEGPTR to buffer
 799  *       edi-8   some magic Win95 needs for SUnMapLS
 800  *               (we use it for the memory handle)
 801  *
 802  *       The SEGPTR is used by the caller!
 803  */
 804
 805 void WINAPI AllocMappedBuffer( CONTEXT86 *context )
 806 {
 807     HGLOBAL handle = GlobalAlloc(0, context->Edi + 8);
 808     DWORD *buffer = (DWORD *)GlobalLock(handle);
 809     SEGPTR ptr = 0;
 810
 811     if (buffer)
 812         if (!(ptr = MapLS(buffer + 2)))
 813         {
 814             GlobalUnlock(handle);
 815             GlobalFree(handle);
 816         }
 817
 818     if (!ptr)
 819         context->Eax = context->Edi = 0;
 820     else
 821     {
 822         buffer[0] = (DWORD)handle;
 823         buffer[1] = ptr;
 824
 825         context->Eax = (DWORD) ptr;
 826         context->Edi = (DWORD)(buffer + 2);
 827     }
 828 }
 829
 830 /**********************************************************************
 831  *              FreeMappedBuffer        (KERNEL32.39)
 832  *
 833  * Free a buffer allocated by AllocMappedBuffer
 834  *
 835  * Input: EDI register: pointer to buffer
 836  */
 837
 838 void WINAPI FreeMappedBuffer( CONTEXT86 *context )
 839 {
 840     if (context->Edi)
 841     {
 842         DWORD *buffer = (DWORD *)context->Edi - 2;
 843
 844         UnMapLS(buffer[1]);
 845
 846         GlobalUnlock((HGLOBAL)buffer[0]);
 847         GlobalFree((HGLOBAL)buffer[0]);
 848     }
 849 }