memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <errno.h>
   9 #include <sys/errno.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <sys/mman.h>
  16 #include "winbase.h"
  17 #include "winerror.h"
  18 #include "file.h"
  19 #include "heap.h"
  20 #include "process.h"
  21 #include "xmalloc.h"
  22 #include "global.h"
  23 #include "debug.h"
  24
  25 #ifndef MS_SYNC
  26 #define MS_SYNC 0
  27 #endif
  28
  29 /* File mapping */
  30 typedef struct
  31 {
  32     K32OBJ        header;
  33     DWORD         size_high;
  34     DWORD         size_low;
  35     FILE_OBJECT  *file;
  36     int           unix_handle;
  37     BYTE          protect;
  38 } FILE_MAPPING;
  39
  40 /* File view */
  41 typedef struct _FV
  42 {
  43     struct _FV   *next;        /* Next view */
  44     struct _FV   *prev;        /* Prev view */
  45     UINT32        base;        /* Base address */
  46     UINT32        size;        /* Size in bytes */
  47     UINT32        flags;       /* Allocation flags */
  48     UINT32        offset;      /* Offset from start of mapped file */
  49     FILE_MAPPING *mapping;     /* File mapping */
  50     HANDLERPROC   handlerProc; /* Fault handler */
  51     LPVOID        handlerArg;  /* Fault handler argument */
  52     BYTE          protect;     /* Protection for all pages at allocation time */
  53     BYTE          prot[1];     /* Protection byte for each page */
  54 } FILE_VIEW;
  55
  56 /* Per-page protection byte values */
  57 #define VPROT_READ       0x01
  58 #define VPROT_WRITE      0x02
  59 #define VPROT_EXEC       0x04
  60 #define VPROT_WRITECOPY  0x08
  61 #define VPROT_GUARD      0x10
  62 #define VPROT_NOCACHE    0x20
  63 #define VPROT_COMMITTED  0x40
  64
  65 /* Per-view flags */
  66 #define VFLAG_SYSTEM     0x01
  67
  68 /* Conversion from VPROT_* to Win32 flags */
  69 static const BYTE VIRTUAL_Win32Flags[16] =
  70 {
  71     PAGE_NOACCESS,              /* 0 */
  72     PAGE_READONLY,              /* READ */
  73     PAGE_READWRITE,             /* WRITE */
  74     PAGE_READWRITE,             /* READ | WRITE */
  75     PAGE_EXECUTE,               /* EXEC */
  76     PAGE_EXECUTE_READ,          /* READ | EXEC */
  77     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  78     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  79     PAGE_WRITECOPY,             /* WRITECOPY */
  80     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  81     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  82     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  83     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  84     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  85     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  86     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  87 };
  88
  89
  90 static FILE_VIEW *VIRTUAL_FirstView;
  91
  92 #ifdef __i386__
  93 /* These are always the same on an i386, and it will be faster this way */
  94 # define page_mask  0xfff
  95 # define page_shift 12
  96 # define granularity_mask 0xffff
  97 #else
  98 static UINT32 page_shift;
  99 static UINT32 page_mask;
 100 static UINT32 granularity_mask;  /* Allocation granularity (usually 64k) */
 101 #endif  /* __i386__ */
 102
 103 #define ROUND_ADDR(addr) \
 104    ((UINT32)(addr) & ~page_mask)
 105
 106 #define ROUND_SIZE(addr,size) \
 107    (((UINT32)(size) + ((UINT32)(addr) & page_mask) + page_mask) & ~page_mask)
 108
 109 static void VIRTUAL_DestroyMapping( K32OBJ *obj );
 110
 111 const K32OBJ_OPS MEM_MAPPED_FILE_Ops =
 112 {
 113     /* Object cannot be waited upon, so we don't need these (except destroy) */
 114     NULL,                      /* signaled */
 115     NULL,                      /* satisfied */
 116     NULL,                      /* add_wait */
 117     NULL,                      /* remove_wait */
 118     NULL,                      /* read */
 119     NULL,                      /* write */
 120     VIRTUAL_DestroyMapping     /* destroy */
 121 };
 122
 123 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
 124    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
 125
 126 /***********************************************************************
 127  *           VIRTUAL_GetProtStr
 128  */
 129 static const char *VIRTUAL_GetProtStr( BYTE prot )
 130 {
 131     static char buffer[6];
 132     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 133     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 134     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 135     buffer[3] = (prot & VPROT_WRITE) ?
 136                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 137     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 138     buffer[5] = 0;
 139     return buffer;
 140 }
 141
 142
 143 /***********************************************************************
 144  *           VIRTUAL_DumpView
 145  */
 146 static void VIRTUAL_DumpView( FILE_VIEW *view )
 147 {
 148     UINT32 i, count;
 149     UINT32 addr = view->base;
 150     BYTE prot = view->prot[0];
 151
 152     DUMP( "View: %08x - %08x%s",
 153           view->base, view->base + view->size - 1,
 154           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 155     if (view->mapping && view->mapping->file)
 156         DUMP( " %s @ %08x\n", view->mapping->file->unix_name, view->offset );
 157     else
 158         DUMP( " (anonymous)\n");
 159
 160     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 161     {
 162         if (view->prot[i] == prot) continue;
 163         DUMP( "      %08x - %08x %s\n",
 164               addr, addr + (count << page_shift) - 1,
 165               VIRTUAL_GetProtStr(prot) );
 166         addr += (count << page_shift);
 167         prot = view->prot[i];
 168         count = 0;
 169     }
 170     if (count)
 171         DUMP( "      %08x - %08x %s\n",
 172               addr, addr + (count << page_shift) - 1,
 173               VIRTUAL_GetProtStr(prot) );
 174 }
 175
 176
 177 /***********************************************************************
 178  *           VIRTUAL_Dump
 179  */
 180 void VIRTUAL_Dump(void)
 181 {
 182     FILE_VIEW *view = VIRTUAL_FirstView;
 183     DUMP( "\nDump of all virtual memory views:\n\n" );
 184     while (view)
 185     {
 186         VIRTUAL_DumpView( view );
 187         view = view->next;
 188     }
 189 }
 190
 191
 192 /***********************************************************************
 193  *           VIRTUAL_FindView
 194  *
 195  * Find the view containing a given address.
 196  *
 197  * RETURNS
 198  *      View: Success
 199  *      NULL: Failure
 200  */
 201 static FILE_VIEW *VIRTUAL_FindView(
 202                   UINT32 addr /* [in] Address */
 203 ) {
 204     FILE_VIEW *view = VIRTUAL_FirstView;
 205     while (view)
 206     {
 207         if (view->base > addr) return NULL;
 208         if (view->base + view->size > addr) return view;
 209         view = view->next;
 210     }
 211     return NULL;
 212 }
 213
 214
 215 /***********************************************************************
 216  *           VIRTUAL_CreateView
 217  *
 218  * Create a new view and add it in the linked list.
 219  */
 220 static FILE_VIEW *VIRTUAL_CreateView( UINT32 base, UINT32 size, UINT32 offset,
 221                                       UINT32 flags, BYTE vprot,
 222                                       FILE_MAPPING *mapping )
 223 {
 224     FILE_VIEW *view, *prev;
 225
 226     /* Create the view structure */
 227
 228     assert( !(base & page_mask) );
 229     assert( !(size & page_mask) );
 230     size >>= page_shift;
 231     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 232     view->base    = base;
 233     view->size    = size << page_shift;
 234     view->flags   = flags;
 235     view->offset  = offset;
 236     view->mapping = mapping;
 237     view->protect = vprot;
 238     memset( view->prot, vprot, size );
 239
 240     /* Insert it in the linked list */
 241
 242     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 243     {
 244         view->next = VIRTUAL_FirstView;
 245         view->prev = NULL;
 246         if (view->next) view->next->prev = view;
 247         VIRTUAL_FirstView = view;
 248     }
 249     else
 250     {
 251         prev = VIRTUAL_FirstView;
 252         while (prev->next && (prev->next->base < base)) prev = prev->next;
 253         view->next = prev->next;
 254         view->prev = prev;
 255         if (view->next) view->next->prev = view;
 256         prev->next  = view;
 257     }
 258     VIRTUAL_DEBUG_DUMP_VIEW( view );
 259     return view;
 260 }
 261
 262
 263 /***********************************************************************
 264  *           VIRTUAL_DeleteView
 265  * Deletes a view.
 266  *
 267  * RETURNS
 268  *      None
 269  */
 270 static void VIRTUAL_DeleteView(
 271             FILE_VIEW *view /* [in] View */
 272 ) {
 273     FILE_munmap( (void *)view->base, 0, view->size );
 274     if (view->next) view->next->prev = view->prev;
 275     if (view->prev) view->prev->next = view->next;
 276     else VIRTUAL_FirstView = view->next;
 277     if (view->mapping) K32OBJ_DecCount( &view->mapping->header );
 278     free( view );
 279 }
 280
 281
 282 /***********************************************************************
 283  *           VIRTUAL_GetUnixProt
 284  *
 285  * Convert page protections to protection for mmap/mprotect.
 286  */
 287 static int VIRTUAL_GetUnixProt( BYTE vprot )
 288 {
 289     int prot = 0;
 290     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 291     {
 292         if (vprot & VPROT_READ) prot |= PROT_READ;
 293         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 294         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 295     }
 296     return prot;
 297 }
 298
 299
 300 /***********************************************************************
 301  *           VIRTUAL_GetWin32Prot
 302  *
 303  * Convert page protections to Win32 flags.
 304  *
 305  * RETURNS
 306  *      None
 307  */
 308 static void VIRTUAL_GetWin32Prot(
 309             BYTE vprot,     /* [in] Page protection flags */
 310             DWORD *protect, /* [out] Location to store Win32 protection flags */
 311             DWORD *state    /* [out] Location to store mem state flag */
 312 ) {
 313     if (protect) {
 314         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 315 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 316         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 317
 318         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 319     }
 320
 321     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 322 }
 323
 324
 325 /***********************************************************************
 326  *           VIRTUAL_GetProt
 327  *
 328  * Build page protections from Win32 flags.
 329  *
 330  * RETURNS
 331  *      Value of page protection flags
 332  */
 333 static BYTE VIRTUAL_GetProt(
 334             DWORD protect  /* [in] Win32 protection flags */
 335 ) {
 336     BYTE vprot;
 337
 338     switch(protect & 0xff)
 339     {
 340     case PAGE_READONLY:
 341         vprot = VPROT_READ;
 342         break;
 343     case PAGE_READWRITE:
 344         vprot = VPROT_READ | VPROT_WRITE;
 345         break;
 346     case PAGE_WRITECOPY:
 347         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 348         break;
 349     case PAGE_EXECUTE:
 350         vprot = VPROT_EXEC;
 351         break;
 352     case PAGE_EXECUTE_READ:
 353         vprot = VPROT_EXEC | VPROT_READ;
 354         break;
 355     case PAGE_EXECUTE_READWRITE:
 356         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 357         break;
 358     case PAGE_EXECUTE_WRITECOPY:
 359         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 360         break;
 361     case PAGE_NOACCESS:
 362     default:
 363         vprot = 0;
 364         break;
 365     }
 366     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 367     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 368     return vprot;
 369 }
 370
 371
 372 /***********************************************************************
 373  *           VIRTUAL_SetProt
 374  *
 375  * Change the protection of a range of pages.
 376  *
 377  * RETURNS
 378  *      TRUE: Success
 379  *      FALSE: Failure
 380  */
 381 static BOOL32 VIRTUAL_SetProt(
 382               FILE_VIEW *view, /* [in] Pointer to view */
 383               UINT32 base,     /* [in] Starting address */
 384               UINT32 size,     /* [in] Size in bytes */
 385               BYTE vprot       /* [in] Protections to use */
 386 ) {
 387     TRACE(virtual, "%08x-%08x %s\n",
 388                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 389
 390     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 391         return FALSE;  /* FIXME: last error */
 392
 393     memset( view->prot + ((base - view->base) >> page_shift),
 394             vprot, size >> page_shift );
 395     VIRTUAL_DEBUG_DUMP_VIEW( view );
 396     return TRUE;
 397 }
 398
 399
 400 /***********************************************************************
 401  *             VIRTUAL_CheckFlags
 402  *
 403  * Check that all pages in a range have the given flags.
 404  *
 405  * RETURNS
 406  *      TRUE: They do
 407  *      FALSE: They do not
 408  */
 409 static BOOL32 VIRTUAL_CheckFlags(
 410               UINT32 base, /* [in] Starting address */
 411               UINT32 size, /* [in] Size in bytes */
 412               BYTE flags   /* [in] Flags to check for */
 413 ) {
 414     FILE_VIEW *view;
 415     UINT32 page;
 416
 417     if (!size) return TRUE;
 418     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 419     if (view->base + view->size < base + size) return FALSE;
 420     page = (base - view->base) >> page_shift;
 421     size = ROUND_SIZE( base, size ) >> page_shift;
 422     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 423     return TRUE;
 424 }
 425
 426
 427 /***********************************************************************
 428  *           VIRTUAL_Init
 429  */
 430 BOOL32 VIRTUAL_Init(void)
 431 {
 432 #ifndef __i386__
 433     DWORD page_size;
 434
 435 # ifdef HAVE_GETPAGESIZE
 436     page_size = getpagesize();
 437 # else
 438 #  ifdef __svr4__
 439     page_size = sysconf(_SC_PAGESIZE);
 440 #  else
 441 #   error Cannot get the page size on this platform
 442 #  endif
 443 # endif
 444     page_mask = page_size - 1;
 445     granularity_mask = 0xffff;  /* hard-coded for now */
 446     /* Make sure we have a power of 2 */
 447     assert( !(page_size & page_mask) );
 448     page_shift = 0;
 449     while ((1 << page_shift) != page_size) page_shift++;
 450 #endif  /* !__i386__ */
 451
 452 #ifdef linux
 453     {
 454         /* Do not use stdio here since it may temporarily change the size
 455          * of some segments (ie libc6 adds 0x1000 per open FILE)
 456          */
 457         int fd = open ("/proc/self/maps", O_RDONLY);
 458         if (fd >= 0)
 459         {
 460             char buffer[512]; /* line might be rather long in 2.1 */
 461
 462             for (;;)
 463             {
 464                 int start, end, offset;
 465                 char r, w, x, p;
 466                 BYTE vprot = VPROT_COMMITTED;
 467
 468                 char * ptr = buffer;
 469                 int count = sizeof(buffer);
 470                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 471                     ptr++;
 472
 473                 if (*ptr != '\n') break;
 474                 *ptr = '\0';
 475
 476                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 477                         &start, &end, &r, &w, &x, &p, &offset );
 478                 if (r == 'r') vprot |= VPROT_READ;
 479                 if (w == 'w') vprot |= VPROT_WRITE;
 480                 if (x == 'x') vprot |= VPROT_EXEC;
 481                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 482                 VIRTUAL_CreateView( start, end - start, 0,
 483                                     VFLAG_SYSTEM, vprot, NULL );
 484             }
 485             close (fd);
 486         }
 487     }
 488 #endif  /* linux */
 489     return TRUE;
 490 }
 491
 492
 493 /***********************************************************************
 494  *           VIRTUAL_GetPageSize
 495  */
 496 DWORD VIRTUAL_GetPageSize(void)
 497 {
 498     return 1 << page_shift;
 499 }
 500
 501
 502 /***********************************************************************
 503  *           VIRTUAL_GetGranularity
 504  */
 505 DWORD VIRTUAL_GetGranularity(void)
 506 {
 507     return granularity_mask + 1;
 508 }
 509
 510
 511 /***********************************************************************
 512  *           VIRTUAL_SetFaultHandler
 513  */
 514 BOOL32 VIRTUAL_SetFaultHandler( LPVOID addr, HANDLERPROC proc, LPVOID arg )
 515 {
 516     FILE_VIEW *view;
 517
 518     if (!(view = VIRTUAL_FindView((UINT32)addr))) return FALSE;
 519     view->handlerProc = proc;
 520     view->handlerArg  = arg;
 521     return TRUE;
 522 }
 523
 524 /***********************************************************************
 525  *           VIRTUAL_HandleFault
 526  */
 527 BOOL32 VIRTUAL_HandleFault(LPVOID addr)
 528 {
 529     FILE_VIEW *view = VIRTUAL_FindView((UINT32)addr);
 530
 531     if (view && view->handlerProc)
 532         return view->handlerProc(view->handlerArg, addr);
 533     return FALSE;
 534 }
 535
 536
 537 /***********************************************************************
 538  *             VirtualAlloc   (KERNEL32.548)
 539  * Reserves or commits a region of pages in virtual address space
 540  *
 541  * RETURNS
 542  *      Base address of allocated region of pages
 543  *      NULL: Failure
 544  */
 545 LPVOID WINAPI VirtualAlloc(
 546               LPVOID addr,  /* [in] Address of region to reserve or commit */
 547               DWORD size,   /* [in] Size of region */
 548               DWORD type,   /* [in] Type of allocation */
 549               DWORD protect /* [in] Type of access protection */
 550 ) {
 551     FILE_VIEW *view;
 552     UINT32 base, ptr, view_size;
 553     BYTE vprot;
 554
 555     TRACE(virtual, "%08x %08lx %lx %08lx\n",
 556                      (UINT32)addr, size, type, protect );
 557
 558     /* Round parameters to a page boundary */
 559
 560     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 561     {
 562         SetLastError( ERROR_OUTOFMEMORY );
 563         return NULL;
 564     }
 565     if (addr)
 566     {
 567         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 568             base = ((UINT32)addr + granularity_mask) & ~granularity_mask;
 569         else
 570             base = ROUND_ADDR( addr );
 571         size = (((UINT32)addr + size + page_mask) & ~page_mask) - base;
 572         if (base + size < base)  /* Disallow wrap-around */
 573         {
 574             SetLastError( ERROR_INVALID_PARAMETER );
 575             return NULL;
 576         }
 577     }
 578     else
 579     {
 580         base = 0;
 581         size = (size + page_mask) & ~page_mask;
 582     }
 583
 584     if (type & MEM_TOP_DOWN) {
 585         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 586          *        Is there _ANY_ way to do it with UNIX mmap()?
 587          */
 588         WARN(virtual,"MEM_TOP_DOWN ignored\n");
 589         type &= ~MEM_TOP_DOWN;
 590     }
 591     /* Compute the protection flags */
 592
 593     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 594         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 595     {
 596         SetLastError( ERROR_INVALID_PARAMETER );
 597         return NULL;
 598     }
 599     if (type & MEM_COMMIT)
 600         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 601     else vprot = 0;
 602
 603     /* Reserve the memory */
 604
 605     if ((type & MEM_RESERVE) || !base)
 606     {
 607         view_size = size + (base ? 0 : granularity_mask + 1);
 608         ptr = (UINT32)FILE_dommap( NULL, -1, (LPVOID)base, 0, view_size, 0, 0,
 609                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 610         if (ptr == (UINT32)-1)
 611         {
 612             SetLastError( ERROR_OUTOFMEMORY );
 613             return NULL;
 614         }
 615         if (!base)
 616         {
 617             /* Release the extra memory while keeping the range */
 618             /* starting on a 64k boundary. */
 619
 620             if (ptr & granularity_mask)
 621             {
 622                 UINT32 extra = granularity_mask + 1 - (ptr & granularity_mask);
 623                 FILE_munmap( (void *)ptr, 0, extra );
 624                 ptr += extra;
 625                 view_size -= extra;
 626             }
 627             if (view_size > size)
 628                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 629         }
 630         else if (ptr != base)
 631         {
 632             /* We couldn't get the address we wanted */
 633             FILE_munmap( (void *)ptr, 0, view_size );
 634             SetLastError( ERROR_INVALID_ADDRESS );
 635             return NULL;
 636         }
 637         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, NULL )))
 638         {
 639             FILE_munmap( (void *)ptr, 0, size );
 640             SetLastError( ERROR_OUTOFMEMORY );
 641             return NULL;
 642         }
 643         VIRTUAL_DEBUG_DUMP_VIEW( view );
 644         return (LPVOID)ptr;
 645     }
 646
 647     /* Commit the pages */
 648
 649     if (!(view = VIRTUAL_FindView( base )) ||
 650         (base + size > view->base + view->size))
 651     {
 652         SetLastError( ERROR_INVALID_PARAMETER );
 653         return NULL;
 654     }
 655
 656     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 657     return (LPVOID)base;
 658 }
 659
 660
 661 /***********************************************************************
 662  *             VirtualFree   (KERNEL32.550)
 663  * Release or decommits a region of pages in virtual address space.
 664  *
 665  * RETURNS
 666  *      TRUE: Success
 667  *      FALSE: Failure
 668  */
 669 BOOL32 WINAPI VirtualFree(
 670               LPVOID addr, /* [in] Address of region of committed pages */
 671               DWORD size,  /* [in] Size of region */
 672               DWORD type   /* [in] Type of operation */
 673 ) {
 674     FILE_VIEW *view;
 675     UINT32 base;
 676
 677     TRACE(virtual, "%08x %08lx %lx\n",
 678                      (UINT32)addr, size, type );
 679
 680     /* Fix the parameters */
 681
 682     size = ROUND_SIZE( addr, size );
 683     base = ROUND_ADDR( addr );
 684
 685     if (!(view = VIRTUAL_FindView( base )) ||
 686         (base + size > view->base + view->size))
 687     {
 688         SetLastError( ERROR_INVALID_PARAMETER );
 689         return FALSE;
 690     }
 691
 692     /* Compute the protection flags */
 693
 694     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 695     {
 696         SetLastError( ERROR_INVALID_PARAMETER );
 697         return FALSE;
 698     }
 699
 700     /* Free the pages */
 701
 702     if (type == MEM_RELEASE)
 703     {
 704         if (size || (base != view->base))
 705         {
 706             SetLastError( ERROR_INVALID_PARAMETER );
 707             return FALSE;
 708         }
 709         VIRTUAL_DeleteView( view );
 710         return TRUE;
 711     }
 712
 713     /* Decommit the pages */
 714     return VIRTUAL_SetProt( view, base, size, 0 );
 715 }
 716
 717
 718 /***********************************************************************
 719  *             VirtualLock   (KERNEL32.551)
 720  * Locks the specified region of virtual address space
 721  *
 722  * NOTE
 723  *      Always returns TRUE
 724  *
 725  * RETURNS
 726  *      TRUE: Success
 727  *      FALSE: Failure
 728  */
 729 BOOL32 WINAPI VirtualLock(
 730               LPVOID addr, /* [in] Address of first byte of range to lock */
 731               DWORD size   /* [in] Number of bytes in range to lock */
 732 ) {
 733     return TRUE;
 734 }
 735
 736
 737 /***********************************************************************
 738  *             VirtualUnlock   (KERNEL32.556)
 739  * Unlocks a range of pages in the virtual address space
 740  *
 741  * NOTE
 742  *      Always returns TRUE
 743  *
 744  * RETURNS
 745  *      TRUE: Success
 746  *      FALSE: Failure
 747  */
 748 BOOL32 WINAPI VirtualUnlock(
 749               LPVOID addr, /* [in] Address of first byte of range */
 750               DWORD size   /* [in] Number of bytes in range */
 751 ) {
 752     return TRUE;
 753 }
 754
 755
 756 /***********************************************************************
 757  *             VirtualProtect   (KERNEL32.552)
 758  * Changes the access protection on a region of committed pages
 759  *
 760  * RETURNS
 761  *      TRUE: Success
 762  *      FALSE: Failure
 763  */
 764 BOOL32 WINAPI VirtualProtect(
 765               LPVOID addr,     /* [in] Address of region of committed pages */
 766               DWORD size,      /* [in] Size of region */
 767               DWORD new_prot,  /* [in] Desired access protection */
 768               LPDWORD old_prot /* [out] Address of variable to get old protection */
 769 ) {
 770     FILE_VIEW *view;
 771     UINT32 base, i;
 772     BYTE vprot, *p;
 773
 774     TRACE(virtual, "%08x %08lx %08lx\n",
 775                      (UINT32)addr, size, new_prot );
 776
 777     /* Fix the parameters */
 778
 779     size = ROUND_SIZE( addr, size );
 780     base = ROUND_ADDR( addr );
 781
 782     if (!(view = VIRTUAL_FindView( base )) ||
 783         (base + size > view->base + view->size))
 784     {
 785         SetLastError( ERROR_INVALID_PARAMETER );
 786         return FALSE;
 787     }
 788
 789     /* Make sure all the pages are committed */
 790
 791     p = view->prot + ((base - view->base) >> page_shift);
 792     for (i = size >> page_shift; i; i--, p++)
 793     {
 794         if (!(*p & VPROT_COMMITTED))
 795         {
 796             SetLastError( ERROR_INVALID_PARAMETER );
 797             return FALSE;
 798         }
 799     }
 800
 801     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 802     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 803     return VIRTUAL_SetProt( view, base, size, vprot );
 804 }
 805
 806
 807 /***********************************************************************
 808  *             VirtualProtectEx   (KERNEL32.553)
 809  * Changes the access protection on a region of committed pages in the
 810  * virtual address space of a specified process
 811  *
 812  * RETURNS
 813  *      TRUE: Success
 814  *      FALSE: Failure
 815  */
 816 BOOL32 WINAPI VirtualProtectEx(
 817               HANDLE32 handle, /* [in]  Handle of process */
 818               LPVOID addr,     /* [in]  Address of region of committed pages */
 819               DWORD size,      /* [in]  Size of region */
 820               DWORD new_prot,  /* [in]  Desired access protection */
 821               LPDWORD old_prot /* [out] Address of variable to get old protection */
 822 ) {
 823     BOOL32 ret = FALSE;
 824
 825     PDB32 *pdb = PROCESS_GetPtr( handle, PROCESS_VM_OPERATION, NULL );
 826     if (pdb)
 827     {
 828         if (pdb == PROCESS_Current())
 829             ret = VirtualProtect( addr, size, new_prot, old_prot );
 830         else
 831             ERR(virtual,"Unsupported on other process\n");
 832         K32OBJ_DecCount( &pdb->header );
 833     }
 834     return ret;
 835 }
 836
 837
 838 /***********************************************************************
 839  *             VirtualQuery   (KERNEL32.554)
 840  * Provides info about a range of pages in virtual address space
 841  *
 842  * RETURNS
 843  *      Number of bytes returned in information buffer
 844  */
 845 DWORD WINAPI VirtualQuery(
 846              LPCVOID addr,                    /* [in]  Address of region */
 847              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 848              DWORD len                        /* [in]  Size of buffer */
 849 ) {
 850     FILE_VIEW *view = VIRTUAL_FirstView;
 851     UINT32 base = ROUND_ADDR( addr );
 852     UINT32 alloc_base = 0;
 853     UINT32 size = 0;
 854
 855     /* Find the view containing the address */
 856
 857     for (;;)
 858     {
 859         if (!view)
 860         {
 861             size = 0xffff0000 - alloc_base;
 862             break;
 863         }
 864         if (view->base > base)
 865         {
 866             size = view->base - alloc_base;
 867             view = NULL;
 868             break;
 869         }
 870         if (view->base + view->size > base)
 871         {
 872             alloc_base = view->base;
 873             size = view->size;
 874             break;
 875         }
 876         alloc_base = view->base + view->size;
 877         view = view->next;
 878     }
 879
 880     /* Fill the info structure */
 881
 882     if (!view)
 883     {
 884         info->State             = MEM_FREE;
 885         info->Protect           = 0;
 886         info->AllocationProtect = 0;
 887         info->Type              = 0;
 888     }
 889     else
 890     {
 891         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 892         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 893         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 894             if (view->prot[size >> page_shift] != vprot) break;
 895         info->AllocationProtect = view->protect;
 896         info->Type              = MEM_PRIVATE;  /* FIXME */
 897     }
 898
 899     info->BaseAddress    = (LPVOID)base;
 900     info->AllocationBase = (LPVOID)alloc_base;
 901     info->RegionSize     = size - (base - alloc_base);
 902     return sizeof(*info);
 903 }
 904
 905
 906 /***********************************************************************
 907  *             VirtualQueryEx   (KERNEL32.555)
 908  * Provides info about a range of pages in virtual address space of a
 909  * specified process
 910  *
 911  * RETURNS
 912  *      Number of bytes returned in information buffer
 913  */
 914 DWORD WINAPI VirtualQueryEx(
 915              HANDLE32 handle,                 /* [in] Handle of process */
 916              LPCVOID addr,                    /* [in] Address of region */
 917              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 918              DWORD len                        /* [in] Size of buffer */
 919 ) {
 920     DWORD ret = len;
 921
 922     PDB32 *pdb = PROCESS_GetPtr( handle, PROCESS_QUERY_INFORMATION, NULL );
 923     if (pdb)
 924     {
 925         if (pdb == PROCESS_Current())
 926             ret = VirtualQuery( addr, info, len );
 927         else
 928             ERR(virtual,"Unsupported on other process\n");
 929         K32OBJ_DecCount( &pdb->header );
 930     }
 931     return ret;
 932 }
 933
 934
 935 /***********************************************************************
 936  *             IsBadReadPtr32   (KERNEL32.354)
 937  *
 938  * RETURNS
 939  *      FALSE: Process has read access to entire block
 940  *      TRUE: Otherwise
 941  */
 942 BOOL32 WINAPI IsBadReadPtr32(
 943               LPCVOID ptr, /* Address of memory block */
 944               UINT32 size  /* Size of block */
 945 ) {
 946     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 947                                 VPROT_READ | VPROT_COMMITTED );
 948 }
 949
 950
 951 /***********************************************************************
 952  *             IsBadWritePtr32   (KERNEL32.357)
 953  *
 954  * RETURNS
 955  *      FALSE: Process has write access to entire block
 956  *      TRUE: Otherwise
 957  */
 958 BOOL32 WINAPI IsBadWritePtr32(
 959               LPVOID ptr, /* [in] Address of memory block */
 960               UINT32 size /* [in] Size of block in bytes */
 961 ) {
 962     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 963                                 VPROT_WRITE | VPROT_COMMITTED );
 964 }
 965
 966
 967 /***********************************************************************
 968  *             IsBadHugeReadPtr32   (KERNEL32.352)
 969  * RETURNS
 970  *      FALSE: Process has read access to entire block
 971  *      TRUE: Otherwise
 972  */
 973 BOOL32 WINAPI IsBadHugeReadPtr32(
 974               LPCVOID ptr, /* [in] Address of memory block */
 975               UINT32 size  /* [in] Size of block */
 976 ) {
 977     return IsBadReadPtr32( ptr, size );
 978 }
 979
 980
 981 /***********************************************************************
 982  *             IsBadHugeWritePtr32   (KERNEL32.353)
 983  * RETURNS
 984  *      FALSE: Process has write access to entire block
 985  *      TRUE: Otherwise
 986  */
 987 BOOL32 WINAPI IsBadHugeWritePtr32(
 988               LPVOID ptr, /* [in] Address of memory block */
 989               UINT32 size /* [in] Size of block */
 990 ) {
 991     return IsBadWritePtr32( ptr, size );
 992 }
 993
 994
 995 /***********************************************************************
 996  *             IsBadCodePtr32   (KERNEL32.351)
 997  *
 998  * RETURNS
 999  *      FALSE: Process has read access to specified memory
1000  *      TRUE: Otherwise
1001  */
1002 BOOL32 WINAPI IsBadCodePtr32(
1003               FARPROC32 ptr /* [in] Address of function */
1004 ) {
1005     return !VIRTUAL_CheckFlags( (UINT32)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
1006 }
1007
1008
1009 /***********************************************************************
1010  *             IsBadStringPtr32A   (KERNEL32.355)
1011  *
1012  * RETURNS
1013  *      FALSE: Read access to all bytes in string
1014  *      TRUE: Else
1015  */
1016 BOOL32 WINAPI IsBadStringPtr32A(
1017               LPCSTR str, /* [in] Address of string */
1018               UINT32 max  /* [in] Maximum size of string */
1019 ) {
1020     FILE_VIEW *view;
1021     UINT32 page, count;
1022
1023     if (!max) return FALSE;
1024     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
1025     page  = ((UINT32)str - view->base) >> page_shift;
1026     count = page_mask + 1 - ((UINT32)str & page_mask);
1027
1028     while (max)
1029     {
1030         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1031                                                 (VPROT_READ | VPROT_COMMITTED))
1032             return TRUE;
1033         if (count > max) count = max;
1034         max -= count;
1035         while (count--) if (!*str++) return FALSE;
1036         if (++page >= view->size >> page_shift) return TRUE;
1037         count = page_mask + 1;
1038     }
1039     return FALSE;
1040 }
1041
1042
1043 /***********************************************************************
1044  *             IsBadStringPtr32W   (KERNEL32.356)
1045  * See IsBadStringPtr32A
1046  */
1047 BOOL32 WINAPI IsBadStringPtr32W( LPCWSTR str, UINT32 max )
1048 {
1049     FILE_VIEW *view;
1050     UINT32 page, count;
1051
1052     if (!max) return FALSE;
1053     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
1054     page  = ((UINT32)str - view->base) >> page_shift;
1055     count = (page_mask + 1 - ((UINT32)str & page_mask)) / sizeof(WCHAR);
1056
1057     while (max)
1058     {
1059         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1060                                                 (VPROT_READ | VPROT_COMMITTED))
1061             return TRUE;
1062         if (count > max) count = max;
1063         max -= count;
1064         while (count--) if (!*str++) return FALSE;
1065         if (++page >= view->size >> page_shift) return TRUE;
1066         count = (page_mask + 1) / sizeof(WCHAR);
1067     }
1068     return FALSE;
1069 }
1070
1071
1072 /***********************************************************************
1073  *             CreateFileMapping32A   (KERNEL32.46)
1074  * Creates a named or unnamed file-mapping object for the specified file
1075  *
1076  * RETURNS
1077  *      Handle: Success
1078  *      0: Mapping object does not exist
1079  *      NULL: Failure
1080  */
1081 HANDLE32 WINAPI CreateFileMapping32A(
1082                 HFILE32 hFile,   /* [in] Handle of file to map */
1083                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1084                 DWORD protect,   /* [in] Protection for mapping object */
1085                 DWORD size_high, /* [in] High-order 32 bits of object size */
1086                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1087                 LPCSTR name      /* [in] Name of file-mapping object */ )
1088 {
1089     FILE_MAPPING *mapping = NULL;
1090     int unix_handle = -1;
1091     HANDLE32 handle;
1092     BYTE vprot;
1093     BOOL32 inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1094
1095     /* First search for an object with the same name */
1096
1097     K32OBJ *obj = K32OBJ_FindName( name );
1098
1099     if (obj)
1100     {
1101         if (obj->type == K32OBJ_MEM_MAPPED_FILE)
1102         {
1103             SetLastError( ERROR_ALREADY_EXISTS );
1104             handle = HANDLE_Alloc( PROCESS_Current(), obj,
1105                                    FILE_MAP_ALL_ACCESS /*FIXME*/, inherit, -1 );
1106         }
1107         else
1108         {
1109             SetLastError( ERROR_DUP_NAME );
1110             handle = 0;
1111         }
1112         K32OBJ_DecCount( obj );
1113         return handle;
1114     }
1115
1116     /* Check parameters */
1117
1118     TRACE(virtual,"(%x,%p,%08lx,%08lx%08lx,%s)\n",
1119           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1120
1121     vprot = VIRTUAL_GetProt( protect );
1122     if (protect & SEC_RESERVE)
1123     {
1124         if (hFile != INVALID_HANDLE_VALUE32)
1125         {
1126             SetLastError( ERROR_INVALID_PARAMETER );
1127             return 0;
1128         }
1129     }
1130     else vprot |= VPROT_COMMITTED;
1131     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1132
1133     /* Compute the size and extend the file if necessary */
1134
1135     if (hFile == INVALID_HANDLE_VALUE32)
1136     {
1137         if (!size_high && !size_low)
1138         {
1139             SetLastError( ERROR_INVALID_PARAMETER );
1140             return 0;
1141         }
1142         obj = NULL;
1143         if (name)
1144         {
1145             CHAR        buf[260];
1146
1147             GetTempPath32A(260,buf);
1148             GetTempFileName32A(buf,"wine",0,buf);
1149             hFile = CreateFile32A(
1150                 buf,
1151                 GENERIC_READ|GENERIC_WRITE,
1152                 FILE_SHARE_READ|FILE_SHARE_WRITE,/* so we can reuse the tmpfn */
1153                 NULL,
1154                 OPEN_ALWAYS,
1155                 0,
1156                 0
1157             );
1158             /* FIXME: bad hack to avoid lots of leftover tempfiles */
1159             DeleteFile32A(buf);
1160             if (hFile == INVALID_HANDLE_VALUE32)
1161                 FIXME(virtual,"could not create temp. file for anon shared mapping: reason was 0x%08lx\n",GetLastError());
1162         }
1163     }
1164     if (hFile != INVALID_HANDLE_VALUE32) /* We have a file */
1165     {
1166         BY_HANDLE_FILE_INFORMATION info;
1167         DWORD access = GENERIC_READ;
1168
1169         if (((protect & 0xff) == PAGE_READWRITE) ||
1170             ((protect & 0xff) == PAGE_WRITECOPY) ||
1171             ((protect & 0xff) == PAGE_EXECUTE_READWRITE) ||
1172             ((protect & 0xff) == PAGE_EXECUTE_WRITECOPY))
1173                 access |= GENERIC_WRITE;
1174         if (!(obj = HANDLE_GetObjPtr( PROCESS_Current(), hFile,
1175                                       K32OBJ_FILE, access, NULL )))
1176             goto error;
1177         if ((unix_handle = FILE_GetUnixHandle( hFile, access )) == -1) goto error;
1178         if (!GetFileInformationByHandle( hFile, &info )) goto error;
1179         if (!size_high && !size_low)
1180         {
1181             size_high = info.nFileSizeHigh;
1182             size_low  = info.nFileSizeLow;
1183         }
1184         else if ((size_high > info.nFileSizeHigh) ||
1185                  ((size_high == info.nFileSizeHigh) &&
1186                   (size_low > info.nFileSizeLow)))
1187         {
1188             /* We have to grow the file */
1189             if (SetFilePointer( hFile, size_low, &size_high,
1190                                 FILE_BEGIN ) == 0xffffffff) goto error;
1191             if (!SetEndOfFile( hFile )) goto error;
1192         }
1193     }
1194
1195     /* Allocate the mapping object */
1196
1197     if (!(mapping = HeapAlloc( SystemHeap, 0, sizeof(*mapping) ))) goto error;
1198     mapping->header.type     = K32OBJ_MEM_MAPPED_FILE;
1199     mapping->header.refcount = 1;
1200     mapping->protect         = vprot;
1201     mapping->size_high       = size_high;
1202     mapping->size_low        = ROUND_SIZE( 0, size_low );
1203     mapping->file            = (FILE_OBJECT *)obj;
1204     mapping->unix_handle     = unix_handle;
1205
1206     if (!K32OBJ_AddName( &mapping->header, name )) handle = 0;
1207     else handle = HANDLE_Alloc( PROCESS_Current(), &mapping->header,
1208                                 FILE_MAP_ALL_ACCESS /*FIXME*/, inherit, -1 );
1209     K32OBJ_DecCount( &mapping->header );
1210     SetLastError(0); /* Last error value is relevant. (see the start of fun) */
1211     return handle;
1212
1213 error:
1214     if (obj) K32OBJ_DecCount( obj );
1215     if (unix_handle != -1) close( unix_handle );
1216     if (mapping) HeapFree( SystemHeap, 0, mapping );
1217     return 0;
1218 }
1219
1220
1221 /***********************************************************************
1222  *             CreateFileMapping32W   (KERNEL32.47)
1223  * See CreateFileMapping32A
1224  */
1225 HANDLE32 WINAPI CreateFileMapping32W( HFILE32 hFile, LPSECURITY_ATTRIBUTES attr,
1226                                       DWORD protect, DWORD size_high,
1227                                       DWORD size_low, LPCWSTR name )
1228 {
1229     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1230     HANDLE32 ret = CreateFileMapping32A( hFile, attr, protect,
1231                                          size_high, size_low, nameA );
1232     HeapFree( GetProcessHeap(), 0, nameA );
1233     return ret;
1234 }
1235
1236
1237 /***********************************************************************
1238  *             OpenFileMapping32A   (KERNEL32.397)
1239  * Opens a named file-mapping object.
1240  *
1241  * RETURNS
1242  *      Handle: Success
1243  *      NULL: Failure
1244  */
1245 HANDLE32 WINAPI OpenFileMapping32A(
1246                 DWORD access,   /* [in] Access mode */
1247                 BOOL32 inherit, /* [in] Inherit flag */
1248                 LPCSTR name     /* [in] Name of file-mapping object */
1249 ) {
1250     HANDLE32 handle = 0;
1251     K32OBJ *obj;
1252     SYSTEM_LOCK();
1253     if ((obj = K32OBJ_FindNameType( name, K32OBJ_MEM_MAPPED_FILE )))
1254     {
1255         handle = HANDLE_Alloc( PROCESS_Current(), obj, access, inherit, -1 );
1256         K32OBJ_DecCount( obj );
1257     }
1258     SYSTEM_UNLOCK();
1259     return handle;
1260 }
1261
1262
1263 /***********************************************************************
1264  *             OpenFileMapping32W   (KERNEL32.398)
1265  * See OpenFileMapping32A
1266  */
1267 HANDLE32 WINAPI OpenFileMapping32W( DWORD access, BOOL32 inherit, LPCWSTR name)
1268 {
1269     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1270     HANDLE32 ret = OpenFileMapping32A( access, inherit, nameA );
1271     HeapFree( GetProcessHeap(), 0, nameA );
1272     return ret;
1273 }
1274
1275
1276 /***********************************************************************
1277  *           VIRTUAL_DestroyMapping
1278  *
1279  * Destroy a FILE_MAPPING object.
1280  */
1281 static void VIRTUAL_DestroyMapping( K32OBJ *ptr )
1282 {
1283     FILE_MAPPING *mapping = (FILE_MAPPING *)ptr;
1284     assert( ptr->type == K32OBJ_MEM_MAPPED_FILE );
1285
1286     if (mapping->file) K32OBJ_DecCount( &mapping->file->header );
1287     if (mapping->unix_handle != -1) close( mapping->unix_handle );
1288     ptr->type = K32OBJ_UNKNOWN;
1289     HeapFree( SystemHeap, 0, mapping );
1290 }
1291
1292
1293 /***********************************************************************
1294  *             MapViewOfFile   (KERNEL32.385)
1295  * Maps a view of a file into the address space
1296  *
1297  * RETURNS
1298  *      Starting address of mapped view
1299  *      NULL: Failure
1300  */
1301 LPVOID WINAPI MapViewOfFile(
1302               HANDLE32 mapping,  /* [in] File-mapping object to map */
1303               DWORD access,      /* [in] Access mode */
1304               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1305               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1306               DWORD count        /* [in] Number of bytes to map */
1307 ) {
1308     return MapViewOfFileEx( mapping, access, offset_high,
1309                             offset_low, count, NULL );
1310 }
1311
1312
1313 /***********************************************************************
1314  *             MapViewOfFileEx   (KERNEL32.386)
1315  * Maps a view of a file into the address space
1316  *
1317  * RETURNS
1318  *      Starting address of mapped view
1319  *      NULL: Failure
1320  */
1321 LPVOID WINAPI MapViewOfFileEx(
1322               HANDLE32 handle,   /* [in] File-mapping object to map */
1323               DWORD access,      /* [in] Access mode */
1324               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1325               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1326               DWORD count,       /* [in] Number of bytes to map */
1327               LPVOID addr        /* [in] Suggested starting address for mapped view */
1328 ) {
1329     FILE_MAPPING *mapping;
1330     FILE_VIEW *view;
1331     UINT32 ptr = (UINT32)-1, size = 0;
1332     int flags = MAP_PRIVATE;
1333
1334     /* Check parameters */
1335
1336     if ((offset_low & granularity_mask) ||
1337         (addr && ((UINT32)addr & granularity_mask)))
1338     {
1339         SetLastError( ERROR_INVALID_PARAMETER );
1340         return NULL;
1341     }
1342
1343     if (!(mapping = (FILE_MAPPING *)HANDLE_GetObjPtr( PROCESS_Current(),
1344                                                       handle,
1345                                                       K32OBJ_MEM_MAPPED_FILE,
1346                                                       0  /* FIXME */, NULL )))
1347         return NULL;
1348
1349     if (mapping->size_high || offset_high)
1350         ERR(virtual, "Offsets larger than 4Gb not supported\n");
1351
1352     if ((offset_low >= mapping->size_low) ||
1353         (count > mapping->size_low - offset_low))
1354     {
1355         SetLastError( ERROR_INVALID_PARAMETER );
1356         goto error;
1357     }
1358     if (count) size = ROUND_SIZE( offset_low, count );
1359     else size = mapping->size_low - offset_low;
1360
1361     switch(access)
1362     {
1363     case FILE_MAP_ALL_ACCESS:
1364     case FILE_MAP_WRITE:
1365     case FILE_MAP_WRITE | FILE_MAP_READ:
1366         if (!(mapping->protect & VPROT_WRITE))
1367         {
1368             SetLastError( ERROR_INVALID_PARAMETER );
1369             goto error;
1370         }
1371         flags = MAP_SHARED;
1372         /* fall through */
1373     case FILE_MAP_READ:
1374     case FILE_MAP_COPY:
1375     case FILE_MAP_COPY | FILE_MAP_READ:
1376         if (mapping->protect & VPROT_READ) break;
1377         /* fall through */
1378     default:
1379         SetLastError( ERROR_INVALID_PARAMETER );
1380         goto error;
1381     }
1382
1383     /* Map the file */
1384
1385     TRACE(virtual, "handle=%x size=%x offset=%lx\n",
1386                      handle, size, offset_low );
1387
1388     ptr = (UINT32)FILE_dommap( mapping->file, mapping->unix_handle,
1389                                addr, 0, size, 0, offset_low,
1390                                VIRTUAL_GetUnixProt( mapping->protect ),
1391                                flags );
1392     if (ptr == (UINT32)-1) {
1393         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1394          * Platform Differences":
1395          * Windows NT: ERROR_INVALID_PARAMETER
1396          * Windows 95: ERROR_INVALID_ADDRESS.
1397          * FIXME: So should we add a module dependend check here? -MM
1398          */
1399         if (errno==ENOMEM)
1400             SetLastError( ERROR_OUTOFMEMORY );
1401         else
1402             SetLastError( ERROR_INVALID_PARAMETER );
1403         goto error;
1404     }
1405
1406     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0,
1407                                      mapping->protect, mapping )))
1408     {
1409         SetLastError( ERROR_OUTOFMEMORY );
1410         goto error;
1411     }
1412     return (LPVOID)ptr;
1413
1414 error:
1415     if (ptr != (UINT32)-1) FILE_munmap( (void *)ptr, 0, size );
1416     K32OBJ_DecCount( &mapping->header );
1417     return NULL;
1418 }
1419
1420
1421 /***********************************************************************
1422  *             FlushViewOfFile   (KERNEL32.262)
1423  * Writes to the disk a byte range within a mapped view of a file
1424  *
1425  * RETURNS
1426  *      TRUE: Success
1427  *      FALSE: Failure
1428  */
1429 BOOL32 WINAPI FlushViewOfFile(
1430               LPCVOID base, /* [in] Start address of byte range to flush */
1431               DWORD cbFlush /* [in] Number of bytes in range */
1432 ) {
1433     FILE_VIEW *view;
1434     UINT32 addr = ROUND_ADDR( base );
1435
1436     TRACE(virtual, "FlushViewOfFile at %p for %ld bytes\n",
1437                      base, cbFlush );
1438
1439     if (!(view = VIRTUAL_FindView( addr )))
1440     {
1441         SetLastError( ERROR_INVALID_PARAMETER );
1442         return FALSE;
1443     }
1444     if (!cbFlush) cbFlush = view->size;
1445     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1446     SetLastError( ERROR_INVALID_PARAMETER );
1447     return FALSE;
1448 }
1449
1450
1451 /***********************************************************************
1452  *             UnmapViewOfFile   (KERNEL32.540)
1453  * Unmaps a mapped view of a file.
1454  *
1455  * NOTES
1456  *      Should addr be an LPCVOID?
1457  *
1458  * RETURNS
1459  *      TRUE: Success
1460  *      FALSE: Failure
1461  */
1462 BOOL32 WINAPI UnmapViewOfFile(
1463               LPVOID addr /* [in] Address where mapped view begins */
1464 ) {
1465     FILE_VIEW *view;
1466     UINT32 base = ROUND_ADDR( addr );
1467     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1468     {
1469         SetLastError( ERROR_INVALID_PARAMETER );
1470         return FALSE;
1471     }
1472     VIRTUAL_DeleteView( view );
1473     return TRUE;
1474 }
1475
1476 /***********************************************************************
1477  *             VIRTUAL_MapFileW
1478  *
1479  * Helper function to map a file to memory:
1480  *  name                        -       file name
1481  *  [RETURN] ptr                -       pointer to mapped file
1482  */
1483 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1484 {
1485     HANDLE32 hFile, hMapping;
1486     LPVOID ptr = NULL;
1487
1488     hFile = CreateFile32W( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1489                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1490     if (hFile != INVALID_HANDLE_VALUE32)
1491     {
1492         hMapping = CreateFileMapping32A( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1493         CloseHandle( hFile );
1494         if (hMapping)
1495         {
1496             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1497             CloseHandle( hMapping );
1498         }
1499     }
1500     return ptr;
1501 }