memory/virtual.c

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