memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <fcntl.h>
   9 #include <stdio.h>
  10 #include <unistd.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/types.h>
  14 #include <sys/mman.h>
  15 #include "winbase.h"
  16 #include "winerror.h"
  17 #include "file.h"
  18 #include "heap.h"
  19 #include "process.h"
  20 #include "xmalloc.h"
  21 #include "stddebug.h"
  22 #include "debug.h"
  23
  24 #ifndef MS_SYNC
  25 #define MS_SYNC 0
  26 #endif
  27
  28 /* File mapping */
  29 typedef struct
  30 {
  31     K32OBJ        header;
  32     DWORD         size_high;
  33     DWORD         size_low;
  34     FILE_OBJECT  *file;
  35     BYTE          protect;
  36 } FILE_MAPPING;
  37
  38 /* File view */
  39 typedef struct _FV
  40 {
  41     struct _FV   *next;     /* Next view */
  42     struct _FV   *prev;     /* Prev view */
  43     UINT32        base;     /* Base address */
  44     UINT32        size;     /* Size in bytes */
  45     UINT32        flags;    /* Allocation flags */
  46     UINT32        offset;   /* Offset from start of mapped file */
  47     FILE_MAPPING *mapping;  /* File mapping */
  48     BYTE          protect;  /* Protection for all pages at allocation time */
  49     BYTE          prot[1];  /* Protection byte for each page */
  50 } FILE_VIEW;
  51
  52 /* Per-page protection byte values */
  53 #define VPROT_READ       0x01
  54 #define VPROT_WRITE      0x02
  55 #define VPROT_EXEC       0x04
  56 #define VPROT_WRITECOPY  0x08
  57 #define VPROT_GUARD      0x10
  58 #define VPROT_NOCACHE    0x20
  59 #define VPROT_COMMITTED  0x40
  60
  61 /* Per-view flags */
  62 #define VFLAG_SYSTEM     0x01
  63
  64 /* Conversion from VPROT_* to Win32 flags */
  65 static const BYTE VIRTUAL_Win32Flags[16] =
  66 {
  67     PAGE_NOACCESS,              /* 0 */
  68     PAGE_READONLY,              /* READ */
  69     PAGE_READWRITE,             /* WRITE */
  70     PAGE_READWRITE,             /* READ | WRITE */
  71     PAGE_EXECUTE,               /* EXEC */
  72     PAGE_EXECUTE_READ,          /* READ | EXEC */
  73     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  74     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  75     PAGE_WRITECOPY,             /* WRITECOPY */
  76     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  77     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  78     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  79     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  80     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  81     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  82     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  83 };
  84
  85
  86 static FILE_VIEW *VIRTUAL_FirstView;
  87
  88 static UINT32 page_shift;
  89 static UINT32 page_mask;
  90 static UINT32 granularity_mask;  /* Allocation granularity (usually 64k) */
  91
  92 #define ROUND_ADDR(addr) \
  93    ((UINT32)(addr) & ~page_mask)
  94
  95 #define ROUND_SIZE(addr,size) \
  96    (((UINT32)(size) + ((UINT32)(addr) & page_mask) + page_mask) & ~page_mask)
  97
  98 static void VIRTUAL_DestroyMapping( K32OBJ *obj );
  99
 100 const K32OBJ_OPS MEM_MAPPED_FILE_Ops =
 101 {
 102     /* Object cannot be waited upon, so we don't need these (except destroy) */
 103     NULL,                      /* signaled */
 104     NULL,                      /* satisfied */
 105     NULL,                      /* add_wait */
 106     NULL,                      /* remove_wait */
 107     VIRTUAL_DestroyMapping     /* destroy */
 108 };
 109
 110 /***********************************************************************
 111  *           VIRTUAL_GetProtStr
 112  */
 113 static const char *VIRTUAL_GetProtStr( BYTE prot )
 114 {
 115     static char buffer[6];
 116     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 117     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 118     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 119     buffer[3] = (prot & VPROT_WRITE) ?
 120                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 121     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 122     buffer[5] = 0;
 123     return buffer;
 124 }
 125
 126
 127 /***********************************************************************
 128  *           VIRTUAL_DumpView
 129  */
 130 static void VIRTUAL_DumpView( FILE_VIEW *view )
 131 {
 132     UINT32 i, count;
 133     UINT32 addr = view->base;
 134     BYTE prot = view->prot[0];
 135
 136     dprintf_virtual( stddeb, "View: %08x - %08x%s",
 137              view->base, view->base + view->size - 1,
 138              (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 139     if (view->mapping && view->mapping->file)
 140         dprintf_virtual( stddeb, " %s @ %08x\n",
 141                  view->mapping->file->unix_name, view->offset );
 142     else
 143         dprintf_virtual( stddeb, " (anonymous)\n");
 144
 145     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 146     {
 147         if (view->prot[i] == prot) continue;
 148         dprintf_virtual( stddeb, "      %08x - %08x %s\n",
 149                  addr, addr + (count << page_shift) - 1,
 150                  VIRTUAL_GetProtStr(prot) );
 151         addr += (count << page_shift);
 152         prot = view->prot[i];
 153         count = 0;
 154     }
 155     if (count)
 156         dprintf_virtual( stddeb, "      %08x - %08x %s\n",
 157                  addr, addr + (count << page_shift) - 1,
 158                  VIRTUAL_GetProtStr(prot) );
 159 }
 160
 161
 162 /***********************************************************************
 163  *           VIRTUAL_Dump
 164  */
 165 void VIRTUAL_Dump(void)
 166 {
 167     FILE_VIEW *view = VIRTUAL_FirstView;
 168     dprintf_virtual( stddeb, "\nDump of all virtual memory views:\n\n" );
 169     while (view)
 170     {
 171         VIRTUAL_DumpView( view );
 172         view = view->next;
 173     }
 174 }
 175
 176
 177 /***********************************************************************
 178  *           VIRTUAL_FindView
 179  *
 180  * Find the view containing a given address.
 181  */
 182 static FILE_VIEW *VIRTUAL_FindView( UINT32 addr )
 183 {
 184     FILE_VIEW *view = VIRTUAL_FirstView;
 185     while (view)
 186     {
 187         if (view->base > addr) return NULL;
 188         if (view->base + view->size > addr) return view;
 189         view = view->next;
 190     }
 191     return NULL;
 192 }
 193
 194
 195 /***********************************************************************
 196  *           VIRTUAL_CreateView
 197  *
 198  * Create a new view and add it in the linked list.
 199  */
 200 static FILE_VIEW *VIRTUAL_CreateView( UINT32 base, UINT32 size, UINT32 offset,
 201                                       UINT32 flags, BYTE vprot,
 202                                       FILE_MAPPING *mapping )
 203 {
 204     FILE_VIEW *view, *prev;
 205
 206     /* Create the view structure */
 207
 208     assert( !(base & page_mask) );
 209     assert( !(size & page_mask) );
 210     size >>= page_shift;
 211     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 212     view->base    = base;
 213     view->size    = size << page_shift;
 214     view->flags   = flags;
 215     view->offset  = offset;
 216     view->mapping = mapping;
 217     view->protect = vprot;
 218     memset( view->prot, vprot, size );
 219
 220     /* Insert it in the linked list */
 221
 222     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 223     {
 224         view->next = VIRTUAL_FirstView;
 225         view->prev = NULL;
 226         if (view->next) view->next->prev = view;
 227         VIRTUAL_FirstView = view;
 228     }
 229     else
 230     {
 231         prev = VIRTUAL_FirstView;
 232         while (prev->next && (prev->next->base < base)) prev = prev->next;
 233         view->next = prev->next;
 234         view->prev = prev;
 235         if (view->next) view->next->prev = view;
 236         prev->next  = view;
 237     }
 238     if (debugging_virtual) VIRTUAL_DumpView( view );
 239     return view;
 240 }
 241
 242
 243 /***********************************************************************
 244  *           VIRTUAL_DeleteView
 245  *
 246  * Delete an view.
 247  */
 248 static void VIRTUAL_DeleteView( FILE_VIEW *view )
 249 {
 250     FILE_munmap( (void *)view->base, 0, view->size );
 251     if (view->next) view->next->prev = view->prev;
 252     if (view->prev) view->prev->next = view->next;
 253     else VIRTUAL_FirstView = view->next;
 254     if (view->mapping) K32OBJ_DecCount( &view->mapping->header );
 255     free( view );
 256 }
 257
 258
 259 /***********************************************************************
 260  *           VIRTUAL_GetUnixProt
 261  *
 262  * Convert page protections to protection for mmap/mprotect.
 263  */
 264 static int VIRTUAL_GetUnixProt( BYTE vprot )
 265 {
 266     int prot = 0;
 267     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 268     {
 269         if (vprot & VPROT_READ) prot |= PROT_READ;
 270         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 271         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 272     }
 273     return prot;
 274 }
 275
 276
 277 /***********************************************************************
 278  *           VIRTUAL_GetWin32Prot
 279  *
 280  * Convert page protections to Win32 flags.
 281  */
 282 static void VIRTUAL_GetWin32Prot( BYTE vprot, DWORD *protect, DWORD *state )
 283 {
 284     *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 285     if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;
 286     if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 287
 288     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 289 }
 290
 291
 292 /***********************************************************************
 293  *           VIRTUAL_GetProt
 294  *
 295  * Build page protections from Win32 flags.
 296  */
 297 static BYTE VIRTUAL_GetProt( DWORD protect )
 298 {
 299     BYTE vprot;
 300
 301     switch(protect & 0xff)
 302     {
 303     case PAGE_READONLY:
 304         vprot = VPROT_READ;
 305         break;
 306     case PAGE_READWRITE:
 307         vprot = VPROT_READ | VPROT_WRITE;
 308         break;
 309     case PAGE_WRITECOPY:
 310         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 311         break;
 312     case PAGE_EXECUTE:
 313         vprot = VPROT_EXEC;
 314         break;
 315     case PAGE_EXECUTE_READ:
 316         vprot = VPROT_EXEC | VPROT_READ;
 317         break;
 318     case PAGE_EXECUTE_READWRITE:
 319         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 320         break;
 321     case PAGE_EXECUTE_WRITECOPY:
 322         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 323         break;
 324     case PAGE_NOACCESS:
 325     default:
 326         vprot = 0;
 327         break;
 328     }
 329     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 330     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 331     return vprot;
 332 }
 333
 334
 335 /***********************************************************************
 336  *           VIRTUAL_SetProt
 337  *
 338  * Change the protection of a range of pages.
 339  */
 340 static BOOL32 VIRTUAL_SetProt( FILE_VIEW *view, UINT32 base,
 341                                UINT32 size, BYTE vprot )
 342 {
 343     dprintf_virtual( stddeb, "VIRTUAL_SetProt: %08x-%08x %s\n",
 344                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 345
 346     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 347         return FALSE;  /* FIXME: last error */
 348
 349     memset( view->prot + ((base - view->base) >> page_shift),
 350             vprot, size >> page_shift );
 351     if (debugging_virtual) VIRTUAL_DumpView( view );
 352     return TRUE;
 353 }
 354
 355
 356 /***********************************************************************
 357  *             VIRTUAL_CheckFlags
 358  *
 359  * Check that all pages in a range have the given flags.
 360  */
 361 static BOOL32 VIRTUAL_CheckFlags( UINT32 base, UINT32 size, BYTE flags )
 362 {
 363     FILE_VIEW *view;
 364     UINT32 page;
 365
 366     if (!size) return TRUE;
 367     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 368     if (view->base + view->size < base + size) return FALSE;
 369     page = (base - view->base) >> page_shift;
 370     size = ROUND_SIZE( base, size ) >> page_shift;
 371     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 372     return TRUE;
 373 }
 374
 375
 376 /***********************************************************************
 377  *           VIRTUAL_Init
 378  */
 379 BOOL32 VIRTUAL_Init(void)
 380 {
 381     SYSTEM_INFO sysinfo;
 382     GetSystemInfo( &sysinfo );
 383
 384     page_mask = sysinfo.dwPageSize - 1;
 385     granularity_mask = sysinfo.dwAllocationGranularity - 1;
 386     /* Make sure we have a power of 2 */
 387     assert( !(sysinfo.dwPageSize & page_mask) );
 388     assert( !(sysinfo.dwAllocationGranularity & granularity_mask) );
 389     page_shift = 0;
 390     while ((1 << page_shift) != sysinfo.dwPageSize) page_shift++;
 391
 392 #ifdef linux
 393     {
 394         /* Do not use stdio here since it may temporarily change the size
 395          * of some segments (ie libc6 adds 0x1000 per open FILE)
 396          */
 397         int fd = open ("/proc/self/maps", O_RDONLY);
 398         if (fd >= 0)
 399         {
 400             char buffer[80];
 401
 402             for (;;)
 403             {
 404                 int start, end, offset;
 405                 char r, w, x, p;
 406                 BYTE vprot = VPROT_COMMITTED;
 407
 408                 char * ptr = buffer;
 409                 int count = sizeof(buffer);
 410                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 411                     ptr++;
 412
 413                 if (*ptr != '\n') break;
 414                 *ptr = '\0';
 415
 416                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 417                         &start, &end, &r, &w, &x, &p, &offset );
 418                 if (r == 'r') vprot |= VPROT_READ;
 419                 if (w == 'w') vprot |= VPROT_WRITE;
 420                 if (x == 'x') vprot |= VPROT_EXEC;
 421                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 422                 VIRTUAL_CreateView( start, end - start, 0,
 423                                     VFLAG_SYSTEM, vprot, NULL );
 424             }
 425             close (fd);
 426         }
 427     }
 428 #endif  /* linux */
 429     return TRUE;
 430 }
 431
 432
 433 /***********************************************************************
 434  *             VirtualAlloc   (KERNEL32.548)
 435  */
 436 LPVOID WINAPI VirtualAlloc( LPVOID addr, DWORD size, DWORD type, DWORD protect)
 437 {
 438     FILE_VIEW *view;
 439     UINT32 base, ptr, view_size;
 440     BYTE vprot;
 441
 442     dprintf_virtual( stddeb, "VirtualAlloc: %08x %08lx %lx %08lx\n",
 443                      (UINT32)addr, size, type, protect );
 444
 445     /* Round parameters to a page boundary */
 446
 447     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 448     {
 449         SetLastError( ERROR_OUTOFMEMORY );
 450         return NULL;
 451     }
 452     if (addr)
 453     {
 454         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 455             base = ((UINT32)addr + granularity_mask) & ~granularity_mask;
 456         else
 457             base = ROUND_ADDR( addr );
 458         size = (((UINT32)addr + size + page_mask) & ~page_mask) - base;
 459         if (base + size < base)  /* Disallow wrap-around */
 460         {
 461             SetLastError( ERROR_INVALID_PARAMETER );
 462             return NULL;
 463         }
 464     }
 465     else
 466     {
 467         base = 0;
 468         size = (size + page_mask) & ~page_mask;
 469     }
 470
 471     /* Compute the protection flags */
 472
 473     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 474         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 475     {
 476         SetLastError( ERROR_INVALID_PARAMETER );
 477         return NULL;
 478     }
 479     if (type & MEM_COMMIT)
 480         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 481     else vprot = 0;
 482
 483     /* Reserve the memory */
 484
 485     if ((type & MEM_RESERVE) || !base)
 486     {
 487         view_size = size + (base ? 0 : granularity_mask + 1);
 488         ptr = (UINT32)FILE_dommap( NULL, (LPVOID)base, 0, view_size, 0, 0,
 489                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 490         if (ptr == (UINT32)-1)
 491         {
 492             SetLastError( ERROR_OUTOFMEMORY );
 493             return NULL;
 494         }
 495         if (!base)
 496         {
 497             /* Release the extra memory while keeping the range */
 498             /* starting on a 64k boundary. */
 499
 500             if (ptr & granularity_mask)
 501             {
 502                 UINT32 extra = granularity_mask + 1 - (ptr & granularity_mask);
 503                 FILE_munmap( (void *)ptr, 0, extra );
 504                 ptr += extra;
 505                 view_size -= extra;
 506             }
 507             if (view_size > size)
 508                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 509         }
 510         else if (ptr != base)
 511         {
 512             /* We couldn't get the address we wanted */
 513             FILE_munmap( (void *)ptr, 0, view_size );
 514             SetLastError( ERROR_INVALID_ADDRESS );
 515             return NULL;
 516         }
 517         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, NULL )))
 518         {
 519             FILE_munmap( (void *)ptr, 0, size );
 520             SetLastError( ERROR_OUTOFMEMORY );
 521             return NULL;
 522         }
 523         if (debugging_virtual) VIRTUAL_DumpView( view );
 524         return (LPVOID)ptr;
 525     }
 526
 527     /* Commit the pages */
 528
 529     if (!(view = VIRTUAL_FindView( base )) ||
 530         (base + size > view->base + view->size))
 531     {
 532         SetLastError( ERROR_INVALID_PARAMETER );
 533         return NULL;
 534     }
 535
 536     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 537     return (LPVOID)base;
 538 }
 539
 540
 541 /***********************************************************************
 542  *             VirtualFree   (KERNEL32.550)
 543  */
 544 BOOL32 WINAPI VirtualFree( LPVOID addr, DWORD size, DWORD type )
 545 {
 546     FILE_VIEW *view;
 547     UINT32 base;
 548
 549     dprintf_virtual( stddeb, "VirtualFree: %08x %08lx %lx\n",
 550                      (UINT32)addr, size, type );
 551
 552     /* Fix the parameters */
 553
 554     size = ROUND_SIZE( addr, size );
 555     base = ROUND_ADDR( addr );
 556
 557     if (!(view = VIRTUAL_FindView( base )) ||
 558         (base + size > view->base + view->size))
 559     {
 560         SetLastError( ERROR_INVALID_PARAMETER );
 561         return FALSE;
 562     }
 563
 564     /* Compute the protection flags */
 565
 566     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 567     {
 568         SetLastError( ERROR_INVALID_PARAMETER );
 569         return FALSE;
 570     }
 571
 572     /* Free the pages */
 573
 574     if (type == MEM_RELEASE)
 575     {
 576         if (size || (base != view->base))
 577         {
 578             SetLastError( ERROR_INVALID_PARAMETER );
 579             return FALSE;
 580         }
 581         VIRTUAL_DeleteView( view );
 582         return TRUE;
 583     }
 584
 585     /* Decommit the pages */
 586
 587     return VIRTUAL_SetProt( view, base, size, 0 );
 588 }
 589
 590
 591 /***********************************************************************
 592  *             VirtualLock   (KERNEL32.551)
 593  */
 594 BOOL32 WINAPI VirtualLock( LPVOID addr, DWORD size )
 595 {
 596     return TRUE;
 597 }
 598
 599
 600 /***********************************************************************
 601  *             VirtualUnlock   (KERNEL32.556)
 602  */
 603 BOOL32 WINAPI VirtualUnlock( LPVOID addr, DWORD size )
 604 {
 605     return TRUE;
 606 }
 607
 608
 609 /***********************************************************************
 610  *             VirtualProtect   (KERNEL32.552)
 611  */
 612 BOOL32 WINAPI VirtualProtect( LPVOID addr, DWORD size, DWORD new_prot,
 613                               LPDWORD old_prot )
 614 {
 615     FILE_VIEW *view;
 616     UINT32 base, i;
 617     BYTE vprot, *p;
 618
 619     dprintf_virtual( stddeb, "VirtualProtect: %08x %08lx %08lx\n",
 620                      (UINT32)addr, size, new_prot );
 621
 622     /* Fix the parameters */
 623
 624     size = ROUND_SIZE( addr, size );
 625     base = ROUND_ADDR( addr );
 626
 627     if (!(view = VIRTUAL_FindView( base )) ||
 628         (base + size > view->base + view->size))
 629     {
 630         SetLastError( ERROR_INVALID_PARAMETER );
 631         return FALSE;
 632     }
 633
 634     /* Make sure all the pages are committed */
 635
 636     p = view->prot + ((base - view->base) >> page_shift);
 637     for (i = size >> page_shift; i; i--, p++)
 638     {
 639         if (!(*p & VPROT_COMMITTED))
 640         {
 641             SetLastError( ERROR_INVALID_PARAMETER );
 642             return FALSE;
 643         }
 644     }
 645
 646     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 647     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 648     return VIRTUAL_SetProt( view, base, size, vprot );
 649 }
 650
 651
 652 /***********************************************************************
 653  *             VirtualProtectEx   (KERNEL32.553)
 654  */
 655 BOOL32 WINAPI VirtualProtectEx( HANDLE32 handle, LPVOID addr, DWORD size,
 656                                 DWORD new_prot, LPDWORD old_prot )
 657 {
 658     BOOL32 ret = FALSE;
 659
 660     PDB32 *pdb = (PDB32 *)PROCESS_GetObjPtr( handle, K32OBJ_PROCESS );
 661     if (pdb)
 662     {
 663         if (pdb == PROCESS_Current())
 664             ret = VirtualProtect( addr, size, new_prot, old_prot );
 665         else
 666             fprintf(stderr,"Unsupported: VirtualProtectEx on other process\n");
 667         K32OBJ_DecCount( &pdb->header );
 668     }
 669     return ret;
 670 }
 671
 672
 673 /***********************************************************************
 674  *             VirtualQuery   (KERNEL32.554)
 675  */
 676 BOOL32 WINAPI VirtualQuery( LPCVOID addr, LPMEMORY_BASIC_INFORMATION info,
 677                             DWORD len )
 678 {
 679     FILE_VIEW *view = VIRTUAL_FirstView;
 680     UINT32 base = ROUND_ADDR( addr );
 681     UINT32 alloc_base = 0;
 682     UINT32 size = 0;
 683
 684     /* Find the view containing the address */
 685
 686     for (;;)
 687     {
 688         if (!view)
 689         {
 690             size = 0xffff0000 - alloc_base;
 691             break;
 692         }
 693         if (view->base > base)
 694         {
 695             size = view->base - alloc_base;
 696             view = NULL;
 697             break;
 698         }
 699         if (view->base + view->size > base)
 700         {
 701             alloc_base = view->base;
 702             size = view->size;
 703             break;
 704         }
 705         alloc_base = view->base + view->size;
 706         view = view->next;
 707     }
 708
 709     /* Fill the info structure */
 710
 711     if (!view)
 712     {
 713         info->State             = MEM_FREE;
 714         info->Protect           = 0;
 715         info->AllocationProtect = 0;
 716         info->Type              = 0;
 717     }
 718     else
 719     {
 720         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 721         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 722         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 723             if (view->prot[size >> page_shift] != vprot) break;
 724         info->AllocationProtect = view->protect;
 725         info->Type              = MEM_PRIVATE;  /* FIXME */
 726     }
 727
 728     info->BaseAddress    = (LPVOID)base;
 729     info->AllocationBase = (LPVOID)alloc_base;
 730     info->RegionSize     = size - (base - alloc_base);
 731     return TRUE;
 732 }
 733
 734
 735 /***********************************************************************
 736  *             VirtualQueryEx   (KERNEL32.555)
 737  */
 738 BOOL32 WINAPI VirtualQueryEx( HANDLE32 handle, LPCVOID addr,
 739                               LPMEMORY_BASIC_INFORMATION info, DWORD len )
 740 {
 741     BOOL32 ret = FALSE;
 742
 743     PDB32 *pdb = (PDB32 *)PROCESS_GetObjPtr( handle, K32OBJ_PROCESS );
 744     if (pdb)
 745     {
 746         if (pdb == PROCESS_Current())
 747             ret = VirtualQuery( addr, info, len );
 748         else
 749             fprintf(stderr,"Unsupported: VirtualQueryEx on other process\n");
 750         K32OBJ_DecCount( &pdb->header );
 751     }
 752     return ret;
 753 }
 754
 755
 756 /***********************************************************************
 757  *             IsBadReadPtr32   (KERNEL32.354)
 758  */
 759 BOOL32 WINAPI IsBadReadPtr32( LPCVOID ptr, UINT32 size )
 760 {
 761     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 762                                 VPROT_READ | VPROT_COMMITTED );
 763 }
 764
 765
 766 /***********************************************************************
 767  *             IsBadWritePtr32   (KERNEL32.357)
 768  */
 769 BOOL32 WINAPI IsBadWritePtr32( LPVOID ptr, UINT32 size )
 770 {
 771     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 772                                 VPROT_WRITE | VPROT_COMMITTED );
 773 }
 774
 775
 776 /***********************************************************************
 777  *             IsBadHugeReadPtr32   (KERNEL32.352)
 778  */
 779 BOOL32 WINAPI IsBadHugeReadPtr32( LPCVOID ptr, UINT32 size )
 780 {
 781     return IsBadReadPtr32( ptr, size );
 782 }
 783
 784
 785 /***********************************************************************
 786  *             IsBadHugeWritePtr32   (KERNEL32.353)
 787  */
 788 BOOL32 WINAPI IsBadHugeWritePtr32( LPVOID ptr, UINT32 size )
 789 {
 790     return IsBadWritePtr32( ptr, size );
 791 }
 792
 793
 794 /***********************************************************************
 795  *             IsBadCodePtr32   (KERNEL32.351)
 796  */
 797 BOOL32 WINAPI IsBadCodePtr32( FARPROC32 ptr )
 798 {
 799     return !VIRTUAL_CheckFlags( (UINT32)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
 800 }
 801
 802
 803 /***********************************************************************
 804  *             IsBadStringPtr32A   (KERNEL32.355)
 805  */
 806 BOOL32 WINAPI IsBadStringPtr32A( LPCSTR str, UINT32 max )
 807 {
 808     FILE_VIEW *view;
 809     UINT32 page, count;
 810
 811     if (!max) return FALSE;
 812     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
 813     page  = ((UINT32)str - view->base) >> page_shift;
 814     count = page_mask + 1 - ((UINT32)str & page_mask);
 815
 816     while (max)
 817     {
 818         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
 819                                                 (VPROT_READ | VPROT_COMMITTED))
 820             return TRUE;
 821         if (count > max) count = max;
 822         max -= count;
 823         while (count--) if (!*str++) return FALSE;
 824         if (++page >= view->size >> page_shift) return TRUE;
 825         count = page_mask + 1;
 826     }
 827     return FALSE;
 828 }
 829
 830
 831 /***********************************************************************
 832  *             IsBadStringPtr32W   (KERNEL32.356)
 833  */
 834 BOOL32 WINAPI IsBadStringPtr32W( LPCWSTR str, UINT32 max )
 835 {
 836     FILE_VIEW *view;
 837     UINT32 page, count;
 838
 839     if (!max) return FALSE;
 840     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
 841     page  = ((UINT32)str - view->base) >> page_shift;
 842     count = (page_mask + 1 - ((UINT32)str & page_mask)) / sizeof(WCHAR);
 843
 844     while (max)
 845     {
 846         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
 847                                                 (VPROT_READ | VPROT_COMMITTED))
 848             return TRUE;
 849         if (count > max) count = max;
 850         max -= count;
 851         while (count--) if (!*str++) return FALSE;
 852         if (++page >= view->size >> page_shift) return TRUE;
 853         count = (page_mask + 1) / sizeof(WCHAR);
 854     }
 855     return FALSE;
 856 }
 857
 858
 859 /***********************************************************************
 860  *             CreateFileMapping32A   (KERNEL32.46)
 861  */
 862 HANDLE32 WINAPI CreateFileMapping32A(HFILE32 hFile, LPSECURITY_ATTRIBUTES attr,
 863                                      DWORD protect, DWORD size_high,
 864                                      DWORD size_low, LPCSTR name )
 865 {
 866     FILE_MAPPING *mapping = NULL;
 867     HANDLE32 handle;
 868     BYTE vprot;
 869
 870     /* First search for an object with the same name */
 871
 872     K32OBJ *obj = K32OBJ_FindName( name );
 873     if (obj)
 874     {
 875         if (obj->type == K32OBJ_MEM_MAPPED_FILE)
 876         {
 877             SetLastError( ERROR_ALREADY_EXISTS );
 878             handle = PROCESS_AllocHandle( obj, 0 );
 879         }
 880         else
 881         {
 882             SetLastError( ERROR_DUP_NAME );
 883             handle = 0;
 884         }
 885         K32OBJ_DecCount( obj );
 886         return handle;
 887     }
 888
 889     /* Check parameters */
 890
 891     dprintf_virtual(stddeb,"CreateFileMapping32A(%x,%p,%08lx,%08lx%08lx,%s)\n",
 892                     hFile, attr, protect, size_high, size_low, name );
 893
 894     vprot = VIRTUAL_GetProt( protect );
 895     if (protect & SEC_RESERVE)
 896     {
 897         if (hFile != INVALID_HANDLE_VALUE32)
 898         {
 899             SetLastError( ERROR_INVALID_PARAMETER );
 900             return 0;
 901         }
 902     }
 903     else vprot |= VPROT_COMMITTED;
 904     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
 905
 906     /* Compute the size and extend the file if necessary */
 907
 908     if (hFile == INVALID_HANDLE_VALUE32)
 909     {
 910         if (!size_high && !size_low)
 911         {
 912             SetLastError( ERROR_INVALID_PARAMETER );
 913             return 0;
 914         }
 915         obj = NULL;
 916     }
 917     else  /* We have a file */
 918     {
 919         BY_HANDLE_FILE_INFORMATION info;
 920         if (!(obj = PROCESS_GetObjPtr( hFile, K32OBJ_FILE ))) goto error;
 921         /* FIXME: should check if the file permissions agree
 922          *        with the required protection flags */
 923         if (!GetFileInformationByHandle( hFile, &info )) goto error;
 924         if (!size_high && !size_low)
 925         {
 926             size_high = info.nFileSizeHigh;
 927             size_low  = info.nFileSizeLow;
 928         }
 929         else if ((size_high > info.nFileSizeHigh) ||
 930                  ((size_high == info.nFileSizeHigh) &&
 931                   (size_low > info.nFileSizeLow)))
 932         {
 933             /* We have to grow the file */
 934             if (SetFilePointer( hFile, size_low, &size_high,
 935                                 FILE_BEGIN ) == 0xffffffff) goto error;
 936             if (!SetEndOfFile( hFile )) goto error;
 937         }
 938     }
 939
 940     /* Allocate the mapping object */
 941
 942     if (!(mapping = HeapAlloc( SystemHeap, 0, sizeof(*mapping) ))) goto error;
 943     mapping->header.type     = K32OBJ_MEM_MAPPED_FILE;
 944     mapping->header.refcount = 1;
 945     mapping->protect         = vprot;
 946     mapping->size_high       = size_high;
 947     mapping->size_low        = ROUND_SIZE( 0, size_low );
 948     mapping->file            = (FILE_OBJECT *)obj;
 949
 950     if (!K32OBJ_AddName( &mapping->header, name )) handle = 0;
 951     else handle = PROCESS_AllocHandle( &mapping->header, 0 );
 952     K32OBJ_DecCount( &mapping->header );
 953     return handle;
 954
 955 error:
 956     if (obj) K32OBJ_DecCount( obj );
 957     if (mapping) HeapFree( SystemHeap, 0, mapping );
 958     return 0;
 959 }
 960
 961
 962 /***********************************************************************
 963  *             CreateFileMapping32W   (KERNEL32.47)
 964  */
 965 HANDLE32 WINAPI CreateFileMapping32W(HFILE32 hFile, LPSECURITY_ATTRIBUTES attr,
 966                                      DWORD protect, DWORD size_high,
 967                                      DWORD size_low, LPCWSTR name )
 968 {
 969     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
 970     HANDLE32 ret = CreateFileMapping32A( hFile, attr, protect,
 971                                          size_high, size_low, nameA );
 972     HeapFree( GetProcessHeap(), 0, nameA );
 973     return ret;
 974 }
 975
 976
 977 /***********************************************************************
 978  *             OpenFileMapping32A   (KERNEL32.397)
 979  */
 980 HANDLE32 WINAPI OpenFileMapping32A( DWORD access, BOOL32 inherit, LPCSTR name )
 981 {
 982     HANDLE32 handle = 0;
 983     K32OBJ *obj;
 984     SYSTEM_LOCK();
 985     if ((obj = K32OBJ_FindNameType( name, K32OBJ_MEM_MAPPED_FILE )))
 986     {
 987         handle = PROCESS_AllocHandle( obj, 0 );
 988         K32OBJ_DecCount( obj );
 989     }
 990     SYSTEM_UNLOCK();
 991     return handle;
 992 }
 993
 994
 995 /***********************************************************************
 996  *             OpenFileMapping32W   (KERNEL32.398)
 997  */
 998 HANDLE32 WINAPI OpenFileMapping32W( DWORD access, BOOL32 inherit, LPCWSTR name)
 999 {
1000     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1001     HANDLE32 ret = OpenFileMapping32A( access, inherit, nameA );
1002     HeapFree( GetProcessHeap(), 0, nameA );
1003     return ret;
1004 }
1005
1006
1007 /***********************************************************************
1008  *           VIRTUAL_DestroyMapping
1009  *
1010  * Destroy a FILE_MAPPING object.
1011  */
1012 static void VIRTUAL_DestroyMapping( K32OBJ *ptr )
1013 {
1014     FILE_MAPPING *mapping = (FILE_MAPPING *)ptr;
1015     assert( ptr->type == K32OBJ_MEM_MAPPED_FILE );
1016
1017     if (mapping->file) K32OBJ_DecCount( &mapping->file->header );
1018     ptr->type = K32OBJ_UNKNOWN;
1019     HeapFree( SystemHeap, 0, mapping );
1020 }
1021
1022
1023 /***********************************************************************
1024  *             MapViewOfFile   (KERNEL32.385)
1025  */
1026 LPVOID WINAPI MapViewOfFile( HANDLE32 mapping, DWORD access, DWORD offset_high,
1027                              DWORD offset_low, DWORD count )
1028 {
1029     return MapViewOfFileEx( mapping, access, offset_high,
1030                             offset_low, count, NULL );
1031 }
1032
1033
1034 /***********************************************************************
1035  *             MapViewOfFileEx   (KERNEL32.386)
1036  */
1037 LPVOID WINAPI MapViewOfFileEx(HANDLE32 handle, DWORD access, DWORD offset_high,
1038                               DWORD offset_low, DWORD count, LPVOID addr )
1039 {
1040     FILE_MAPPING *mapping;
1041     FILE_VIEW *view;
1042     UINT32 ptr = (UINT32)-1, size = 0;
1043     int flags = MAP_PRIVATE;
1044
1045     /* Check parameters */
1046
1047     if ((offset_low & granularity_mask) ||
1048         (addr && ((UINT32)addr & granularity_mask)))
1049     {
1050         SetLastError( ERROR_INVALID_PARAMETER );
1051         return NULL;
1052     }
1053
1054     if (!(mapping = (FILE_MAPPING *)PROCESS_GetObjPtr( handle,
1055                                                      K32OBJ_MEM_MAPPED_FILE )))
1056         return NULL;
1057
1058     if (mapping->size_high || offset_high)
1059         fprintf( stderr, "MapViewOfFileEx: offsets larger than 4Gb not supported\n");
1060
1061     if ((offset_low >= mapping->size_low) ||
1062         (count > mapping->size_low - offset_low))
1063     {
1064         SetLastError( ERROR_INVALID_PARAMETER );
1065         goto error;
1066     }
1067     if (count) size = ROUND_SIZE( offset_low, count );
1068     else size = mapping->size_low - offset_low;
1069
1070     switch(access)
1071     {
1072     case FILE_MAP_ALL_ACCESS:
1073     case FILE_MAP_WRITE:
1074     case FILE_MAP_WRITE | FILE_MAP_READ:
1075         if (!(mapping->protect & VPROT_WRITE))
1076         {
1077             SetLastError( ERROR_INVALID_PARAMETER );
1078             goto error;
1079         }
1080         flags = MAP_SHARED;
1081         /* fall through */
1082     case FILE_MAP_READ:
1083     case FILE_MAP_COPY:
1084     case FILE_MAP_COPY | FILE_MAP_READ:
1085         if (mapping->protect & VPROT_READ) break;
1086         /* fall through */
1087     default:
1088         SetLastError( ERROR_INVALID_PARAMETER );
1089         goto error;
1090     }
1091
1092     /* Map the file */
1093
1094     dprintf_virtual( stddeb, "MapViewOfFile: handle=%x size=%x offset=%lx\n",
1095                      handle, size, offset_low );
1096
1097     ptr = (UINT32)FILE_dommap( mapping->file, addr, 0, size, 0, offset_low,
1098                                VIRTUAL_GetUnixProt( mapping->protect ),
1099                                flags );
1100     if (ptr == (UINT32)-1)
1101     {
1102         SetLastError( ERROR_OUTOFMEMORY );
1103         goto error;
1104     }
1105
1106     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0,
1107                                      mapping->protect, mapping )))
1108     {
1109         SetLastError( ERROR_OUTOFMEMORY );
1110         goto error;
1111     }
1112     return (LPVOID)ptr;
1113
1114 error:
1115     if (ptr != (UINT32)-1) FILE_munmap( (void *)ptr, 0, size );
1116     K32OBJ_DecCount( &mapping->header );
1117     return NULL;
1118 }
1119
1120
1121 /***********************************************************************
1122  *             FlushViewOfFile   (KERNEL32.262)
1123  */
1124 BOOL32 WINAPI FlushViewOfFile( LPCVOID base, DWORD cbFlush )
1125 {
1126     FILE_VIEW *view;
1127     UINT32 addr = ROUND_ADDR( base );
1128
1129     dprintf_virtual( stddeb, "FlushViewOfFile at %p for %ld bytes\n",
1130                      base, cbFlush );
1131
1132     if (!(view = VIRTUAL_FindView( addr )))
1133     {
1134         SetLastError( ERROR_INVALID_PARAMETER );
1135         return FALSE;
1136     }
1137     if (!cbFlush) cbFlush = view->size;
1138     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1139     SetLastError( ERROR_INVALID_PARAMETER );
1140     return FALSE;
1141
1142 }
1143 /***********************************************************************
1144  *             UnmapViewOfFile   (KERNEL32.540)
1145  */
1146 BOOL32 WINAPI UnmapViewOfFile( LPVOID addr )
1147 {
1148     FILE_VIEW *view;
1149     UINT32 base = ROUND_ADDR( addr );
1150     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1151     {
1152         SetLastError( ERROR_INVALID_PARAMETER );
1153         return FALSE;
1154     }
1155     VIRTUAL_DeleteView( view );
1156     return TRUE;
1157 }