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 "winnls.h"
  24 #include "winbase.h"
  25 #include "wine/exception.h"
  26 #include "wine/unicode.h"
  27 #include "winerror.h"
  28 #include "file.h"
  29 #include "process.h"
  30 #include "global.h"
  31 #include "server.h"
  32 #include "debugtools.h"
  33
  34 DEFAULT_DEBUG_CHANNEL(virtual);
  35 DECLARE_DEBUG_CHANNEL(module);
  36
  37 #ifndef MS_SYNC
  38 #define MS_SYNC 0
  39 #endif
  40
  41 /* File view */
  42 typedef struct _FV
  43 {
  44     struct _FV   *next;        /* Next view */
  45     struct _FV   *prev;        /* Prev view */
  46     UINT        base;        /* Base address */
  47     UINT        size;        /* Size in bytes */
  48     UINT        flags;       /* Allocation flags */
  49     HANDLE      mapping;     /* Handle to the 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-view flags */
  57 #define VFLAG_SYSTEM     0x01
  58
  59 /* Conversion from VPROT_* to Win32 flags */
  60 static const BYTE VIRTUAL_Win32Flags[16] =
  61 {
  62     PAGE_NOACCESS,              /* 0 */
  63     PAGE_READONLY,              /* READ */
  64     PAGE_READWRITE,             /* WRITE */
  65     PAGE_READWRITE,             /* READ | WRITE */
  66     PAGE_EXECUTE,               /* EXEC */
  67     PAGE_EXECUTE_READ,          /* READ | EXEC */
  68     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  69     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  70     PAGE_WRITECOPY,             /* WRITECOPY */
  71     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  72     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  73     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  74     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  75     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  76     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  77     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  78 };
  79
  80
  81 static FILE_VIEW *VIRTUAL_FirstView;
  82 static CRITICAL_SECTION csVirtual = CRITICAL_SECTION_INIT;
  83
  84 #ifdef __i386__
  85 /* These are always the same on an i386, and it will be faster this way */
  86 # define page_mask  0xfff
  87 # define page_shift 12
  88 # define page_size  0x1000
  89 #else
  90 static UINT page_shift;
  91 static UINT page_mask;
  92 static UINT page_size;
  93 #endif  /* __i386__ */
  94 #define granularity_mask 0xffff  /* Allocation granularity (usually 64k) */
  95
  96 #define ROUND_ADDR(addr) \
  97    ((UINT)(addr) & ~page_mask)
  98
  99 #define ROUND_SIZE(addr,size) \
 100    (((UINT)(size) + ((UINT)(addr) & page_mask) + page_mask) & ~page_mask)
 101
 102 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
 103    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
 104
 105
 106 /* filter for page-fault exceptions */
 107 static WINE_EXCEPTION_FILTER(page_fault)
 108 {
 109     if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
 110         return EXCEPTION_EXECUTE_HANDLER;
 111     return EXCEPTION_CONTINUE_SEARCH;
 112 }
 113
 114 /***********************************************************************
 115  *           VIRTUAL_GetProtStr
 116  */
 117 static const char *VIRTUAL_GetProtStr( BYTE prot )
 118 {
 119     static char buffer[6];
 120     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 121     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 122     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 123     buffer[3] = (prot & VPROT_WRITE) ?
 124                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 125     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 126     buffer[5] = 0;
 127     return buffer;
 128 }
 129
 130
 131 /***********************************************************************
 132  *           VIRTUAL_DumpView
 133  */
 134 static void VIRTUAL_DumpView( FILE_VIEW *view )
 135 {
 136     UINT i, count;
 137     UINT addr = view->base;
 138     BYTE prot = view->prot[0];
 139
 140     DPRINTF( "View: %08x - %08x%s",
 141           view->base, view->base + view->size - 1,
 142           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 143     if (view->mapping)
 144         DPRINTF( " %d\n", view->mapping );
 145     else
 146         DPRINTF( " (anonymous)\n");
 147
 148     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 149     {
 150         if (view->prot[i] == prot) continue;
 151         DPRINTF( "      %08x - %08x %s\n",
 152               addr, addr + (count << page_shift) - 1,
 153               VIRTUAL_GetProtStr(prot) );
 154         addr += (count << page_shift);
 155         prot = view->prot[i];
 156         count = 0;
 157     }
 158     if (count)
 159         DPRINTF( "      %08x - %08x %s\n",
 160               addr, addr + (count << page_shift) - 1,
 161               VIRTUAL_GetProtStr(prot) );
 162 }
 163
 164
 165 /***********************************************************************
 166  *           VIRTUAL_Dump
 167  */
 168 void VIRTUAL_Dump(void)
 169 {
 170     FILE_VIEW *view;
 171     DPRINTF( "\nDump of all virtual memory views:\n\n" );
 172     EnterCriticalSection(&csVirtual);
 173     view = VIRTUAL_FirstView;
 174     while (view)
 175     {
 176         VIRTUAL_DumpView( view );
 177         view = view->next;
 178     }
 179     LeaveCriticalSection(&csVirtual);
 180 }
 181
 182
 183 /***********************************************************************
 184  *           VIRTUAL_FindView
 185  *
 186  * Find the view containing a given address.
 187  *
 188  * RETURNS
 189  *      View: Success
 190  *      NULL: Failure
 191  */
 192 static FILE_VIEW *VIRTUAL_FindView(
 193                   UINT addr /* [in] Address */
 194 ) {
 195     FILE_VIEW *view;
 196
 197     EnterCriticalSection(&csVirtual);
 198     view = VIRTUAL_FirstView;
 199     while (view)
 200     {
 201         if (view->base > addr)
 202         {
 203             view = NULL;
 204             break;
 205         }
 206         if (view->base + view->size > addr) break;
 207         view = view->next;
 208     }
 209     LeaveCriticalSection(&csVirtual);
 210     return view;
 211 }
 212
 213
 214 /***********************************************************************
 215  *           VIRTUAL_CreateView
 216  *
 217  * Create a new view and add it in the linked list.
 218  */
 219 static FILE_VIEW *VIRTUAL_CreateView( UINT base, UINT size, UINT flags,
 220                                       BYTE vprot, HANDLE mapping )
 221 {
 222     FILE_VIEW *view, *prev;
 223
 224     /* Create the view structure */
 225
 226     assert( !(base & page_mask) );
 227     assert( !(size & page_mask) );
 228     size >>= page_shift;
 229     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 230     view->base    = base;
 231     view->size    = size << page_shift;
 232     view->flags   = flags;
 233     view->mapping = mapping;
 234     view->protect = vprot;
 235     view->handlerProc = NULL;
 236     memset( view->prot, vprot, size );
 237
 238     /* Duplicate the mapping handle */
 239
 240     if ((view->mapping != -1) &&
 241         !DuplicateHandle( GetCurrentProcess(), view->mapping,
 242                           GetCurrentProcess(), &view->mapping,
 243                           0, FALSE, DUPLICATE_SAME_ACCESS ))
 244     {
 245         free( view );
 246         return NULL;
 247     }
 248
 249     /* Insert it in the linked list */
 250
 251     EnterCriticalSection(&csVirtual);
 252     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 253     {
 254         view->next = VIRTUAL_FirstView;
 255         view->prev = NULL;
 256         if (view->next) view->next->prev = view;
 257         VIRTUAL_FirstView = view;
 258     }
 259     else
 260     {
 261         prev = VIRTUAL_FirstView;
 262         while (prev->next && (prev->next->base < base)) prev = prev->next;
 263         view->next = prev->next;
 264         view->prev = prev;
 265         if (view->next) view->next->prev = view;
 266         prev->next  = view;
 267     }
 268     LeaveCriticalSection(&csVirtual);
 269     VIRTUAL_DEBUG_DUMP_VIEW( view );
 270     return view;
 271 }
 272
 273
 274 /***********************************************************************
 275  *           VIRTUAL_DeleteView
 276  * Deletes a view.
 277  *
 278  * RETURNS
 279  *      None
 280  */
 281 static void VIRTUAL_DeleteView(
 282             FILE_VIEW *view /* [in] View */
 283 ) {
 284     if (!(view->flags & VFLAG_SYSTEM))
 285         munmap( (void *)view->base, view->size );
 286     EnterCriticalSection(&csVirtual);
 287     if (view->next) view->next->prev = view->prev;
 288     if (view->prev) view->prev->next = view->next;
 289     else VIRTUAL_FirstView = view->next;
 290     LeaveCriticalSection(&csVirtual);
 291     if (view->mapping) CloseHandle( view->mapping );
 292     free( view );
 293 }
 294
 295
 296 /***********************************************************************
 297  *           VIRTUAL_GetUnixProt
 298  *
 299  * Convert page protections to protection for mmap/mprotect.
 300  */
 301 static int VIRTUAL_GetUnixProt( BYTE vprot )
 302 {
 303     int prot = 0;
 304     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 305     {
 306         if (vprot & VPROT_READ) prot |= PROT_READ;
 307         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 308         if (vprot & VPROT_WRITECOPY) prot |= PROT_WRITE;
 309         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 310     }
 311     return prot;
 312 }
 313
 314
 315 /***********************************************************************
 316  *           VIRTUAL_GetWin32Prot
 317  *
 318  * Convert page protections to Win32 flags.
 319  *
 320  * RETURNS
 321  *      None
 322  */
 323 static void VIRTUAL_GetWin32Prot(
 324             BYTE vprot,     /* [in] Page protection flags */
 325             DWORD *protect, /* [out] Location to store Win32 protection flags */
 326             DWORD *state    /* [out] Location to store mem state flag */
 327 ) {
 328     if (protect) {
 329         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 330 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 331         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 332
 333         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 334     }
 335
 336     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 337 }
 338
 339
 340 /***********************************************************************
 341  *           VIRTUAL_GetProt
 342  *
 343  * Build page protections from Win32 flags.
 344  *
 345  * RETURNS
 346  *      Value of page protection flags
 347  */
 348 static BYTE VIRTUAL_GetProt(
 349             DWORD protect  /* [in] Win32 protection flags */
 350 ) {
 351     BYTE vprot;
 352
 353     switch(protect & 0xff)
 354     {
 355     case PAGE_READONLY:
 356         vprot = VPROT_READ;
 357         break;
 358     case PAGE_READWRITE:
 359         vprot = VPROT_READ | VPROT_WRITE;
 360         break;
 361     case PAGE_WRITECOPY:
 362         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 363         break;
 364     case PAGE_EXECUTE:
 365         vprot = VPROT_EXEC;
 366         break;
 367     case PAGE_EXECUTE_READ:
 368         vprot = VPROT_EXEC | VPROT_READ;
 369         break;
 370     case PAGE_EXECUTE_READWRITE:
 371         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 372         break;
 373     case PAGE_EXECUTE_WRITECOPY:
 374         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 375         break;
 376     case PAGE_NOACCESS:
 377     default:
 378         vprot = 0;
 379         break;
 380     }
 381     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 382     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 383     return vprot;
 384 }
 385
 386
 387 /***********************************************************************
 388  *           VIRTUAL_SetProt
 389  *
 390  * Change the protection of a range of pages.
 391  *
 392  * RETURNS
 393  *      TRUE: Success
 394  *      FALSE: Failure
 395  */
 396 static BOOL VIRTUAL_SetProt(
 397               FILE_VIEW *view, /* [in] Pointer to view */
 398               UINT base,     /* [in] Starting address */
 399               UINT size,     /* [in] Size in bytes */
 400               BYTE vprot       /* [in] Protections to use */
 401 ) {
 402     TRACE("%08x-%08x %s\n",
 403                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 404
 405     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 406         return FALSE;  /* FIXME: last error */
 407
 408     memset( view->prot + ((base - view->base) >> page_shift),
 409             vprot, size >> page_shift );
 410     VIRTUAL_DEBUG_DUMP_VIEW( view );
 411     return TRUE;
 412 }
 413
 414
 415 /***********************************************************************
 416  *           map_image
 417  *
 418  * Map an executable (PE format) image into memory.
 419  */
 420 static LPVOID map_image( HANDLE hmapping, int fd, char *base, DWORD total_size,
 421                          DWORD header_size, HANDLE shared_file, DWORD shared_size )
 422 {
 423     IMAGE_DOS_HEADER *dos;
 424     IMAGE_NT_HEADERS *nt;
 425     IMAGE_SECTION_HEADER *sec;
 426     int i, pos;
 427     DWORD err = GetLastError();
 428     FILE_VIEW *view = NULL;
 429     char *ptr;
 430     int shared_fd = -1;
 431
 432     SetLastError( ERROR_BAD_EXE_FORMAT );  /* generic error */
 433
 434     /* zero-map the whole range */
 435
 436     if ((ptr = VIRTUAL_mmap( -1, base, total_size, 0,
 437                              PROT_READ | PROT_WRITE | PROT_EXEC, 0 )) == (char *)-1)
 438     {
 439         ptr = VIRTUAL_mmap( -1, NULL, total_size, 0,
 440                             PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
 441         if (ptr == (char *)-1)
 442         {
 443             ERR_(module)("Not enough memory for module (%ld bytes)\n", total_size);
 444             goto error;
 445         }
 446     }
 447     TRACE_(module)( "mapped PE file at %p-%p\n", ptr, ptr + total_size );
 448
 449     if (!(view = VIRTUAL_CreateView( (UINT)ptr, total_size, 0,
 450                                      VPROT_COMMITTED|VPROT_READ|VPROT_WRITE|VPROT_WRITECOPY,
 451                                      hmapping )))
 452     {
 453         munmap( ptr, total_size );
 454         SetLastError( ERROR_OUTOFMEMORY );
 455         goto error;
 456     }
 457
 458     /* map the header */
 459
 460     if (VIRTUAL_mmap( fd, ptr, header_size, 0, PROT_READ | PROT_WRITE,
 461                       MAP_PRIVATE | MAP_FIXED ) == (char *)-1) goto error;
 462     dos = (IMAGE_DOS_HEADER *)ptr;
 463     nt = (IMAGE_NT_HEADERS *)(ptr + dos->e_lfanew);
 464     if ((char *)(nt + 1) > ptr + header_size) goto error;
 465
 466     sec = (IMAGE_SECTION_HEADER*)((char*)&nt->OptionalHeader+nt->FileHeader.SizeOfOptionalHeader);
 467     if ((char *)(sec + nt->FileHeader.NumberOfSections) > ptr + header_size) goto error;
 468
 469     /* check the architecture */
 470
 471     if (nt->FileHeader.Machine != IMAGE_FILE_MACHINE_I386)
 472     {
 473         MESSAGE("Trying to load PE image for unsupported architecture (");
 474         switch (nt->FileHeader.Machine)
 475         {
 476         case IMAGE_FILE_MACHINE_UNKNOWN: MESSAGE("Unknown"); break;
 477         case IMAGE_FILE_MACHINE_I860:    MESSAGE("I860"); break;
 478         case IMAGE_FILE_MACHINE_R3000:   MESSAGE("R3000"); break;
 479         case IMAGE_FILE_MACHINE_R4000:   MESSAGE("R4000"); break;
 480         case IMAGE_FILE_MACHINE_R10000:  MESSAGE("R10000"); break;
 481         case IMAGE_FILE_MACHINE_ALPHA:   MESSAGE("Alpha"); break;
 482         case IMAGE_FILE_MACHINE_POWERPC: MESSAGE("PowerPC"); break;
 483         default: MESSAGE("Unknown-%04x", nt->FileHeader.Machine); break;
 484         }
 485         MESSAGE(")\n");
 486         goto error;
 487     }
 488
 489     /* retrieve the shared sections file */
 490
 491     if (shared_size)
 492     {
 493         if ((shared_fd = FILE_GetUnixHandle( shared_file, GENERIC_READ )) == -1) goto error;
 494         CloseHandle( shared_file );  /* we no longer need it */
 495         shared_file = INVALID_HANDLE_VALUE;
 496     }
 497
 498     /* map all the sections */
 499
 500     for (i = pos = 0; i < nt->FileHeader.NumberOfSections; i++, sec++)
 501     {
 502         DWORD size;
 503
 504         /* a few sanity checks */
 505         size = sec->VirtualAddress + ROUND_SIZE( sec->VirtualAddress, sec->Misc.VirtualSize );
 506         if (sec->VirtualAddress > total_size || size > total_size || size < sec->VirtualAddress)
 507         {
 508             ERR_(module)( "Section %.8s too large (%lx+%lx/%lx)\n",
 509                           sec->Name, sec->VirtualAddress, sec->Misc.VirtualSize, total_size );
 510             goto error;
 511         }
 512
 513         if ((sec->Characteristics & IMAGE_SCN_MEM_SHARED) &&
 514             (sec->Characteristics & IMAGE_SCN_MEM_WRITE))
 515         {
 516             size = ROUND_SIZE( 0, sec->Misc.VirtualSize );
 517             TRACE_(module)( "mapping shared section %.8s at %p off %lx (%x) size %lx (%lx) flags %lx\n",
 518                           sec->Name, (char *)ptr + sec->VirtualAddress,
 519                           sec->PointerToRawData, pos, sec->SizeOfRawData,
 520                           size, sec->Characteristics );
 521             if (VIRTUAL_mmap( shared_fd, (char *)ptr + sec->VirtualAddress, size,
 522                               pos, PROT_READ|PROT_WRITE|PROT_EXEC,
 523                               MAP_SHARED|MAP_FIXED ) == (void *)-1)
 524             {
 525                 ERR_(module)( "Could not map shared section %.8s\n", sec->Name );
 526                 goto error;
 527             }
 528             pos += size;
 529             continue;
 530         }
 531
 532         if (sec->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
 533         if (!sec->PointerToRawData || !sec->SizeOfRawData) continue;
 534
 535         TRACE_(module)( "mapping section %.8s at %p off %lx size %lx flags %lx\n",
 536                         sec->Name, (char *)ptr + sec->VirtualAddress,
 537                         sec->PointerToRawData, sec->SizeOfRawData,
 538                         sec->Characteristics );
 539
 540         /* Note: if the section is not aligned properly VIRTUAL_mmap will magically
 541          *       fall back to read(), so we don't need to check anything here.
 542          */
 543         if (VIRTUAL_mmap( fd, (char *)ptr + sec->VirtualAddress, sec->SizeOfRawData,
 544                           sec->PointerToRawData, PROT_READ|PROT_WRITE|PROT_EXEC,
 545                           MAP_PRIVATE | MAP_FIXED ) == (void *)-1)
 546         {
 547             ERR_(module)( "Could not map section %.8s, file probably truncated\n", sec->Name );
 548             goto error;
 549         }
 550
 551         if ((sec->SizeOfRawData < sec->Misc.VirtualSize) && (sec->SizeOfRawData & page_mask))
 552         {
 553             DWORD end = ROUND_SIZE( 0, sec->SizeOfRawData );
 554             if (end > sec->Misc.VirtualSize) end = sec->Misc.VirtualSize;
 555             TRACE_(module)("clearing %p - %p\n",
 556                            (char *)ptr + sec->VirtualAddress + sec->SizeOfRawData,
 557                            (char *)ptr + sec->VirtualAddress + end );
 558             memset( (char *)ptr + sec->VirtualAddress + sec->SizeOfRawData, 0,
 559                     end - sec->SizeOfRawData );
 560         }
 561     }
 562
 563     SetLastError( err );  /* restore last error */
 564     close( fd );
 565     if (shared_fd != -1) close( shared_fd );
 566     return ptr;
 567
 568  error:
 569     if (view) VIRTUAL_DeleteView( view );
 570     close( fd );
 571     if (shared_fd != -1) close( shared_fd );
 572     if (shared_file != INVALID_HANDLE_VALUE) CloseHandle( shared_file );
 573     return NULL;
 574 }
 575
 576
 577 /***********************************************************************
 578  *           VIRTUAL_Init
 579  */
 580 #ifndef page_mask
 581 DECL_GLOBAL_CONSTRUCTOR(VIRTUAL_Init)
 582 {
 583 # ifdef HAVE_GETPAGESIZE
 584     page_size = getpagesize();
 585 # else
 586 #  ifdef __svr4__
 587     page_size = sysconf(_SC_PAGESIZE);
 588 #  else
 589 #   error Cannot get the page size on this platform
 590 #  endif
 591 # endif
 592     page_mask = page_size - 1;
 593     /* Make sure we have a power of 2 */
 594     assert( !(page_size & page_mask) );
 595     page_shift = 0;
 596     while ((1 << page_shift) != page_size) page_shift++;
 597 }
 598 #endif  /* page_mask */
 599
 600
 601 /***********************************************************************
 602  *           VIRTUAL_GetPageSize
 603  */
 604 DWORD VIRTUAL_GetPageSize(void)
 605 {
 606     return 1 << page_shift;
 607 }
 608
 609
 610 /***********************************************************************
 611  *           VIRTUAL_GetGranularity
 612  */
 613 DWORD VIRTUAL_GetGranularity(void)
 614 {
 615     return granularity_mask + 1;
 616 }
 617
 618
 619 /***********************************************************************
 620  *           VIRTUAL_SetFaultHandler
 621  */
 622 BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
 623 {
 624     FILE_VIEW *view;
 625
 626     if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
 627     view->handlerProc = proc;
 628     view->handlerArg  = arg;
 629     return TRUE;
 630 }
 631
 632 /***********************************************************************
 633  *           VIRTUAL_HandleFault
 634  */
 635 DWORD VIRTUAL_HandleFault( LPCVOID addr )
 636 {
 637     FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
 638     DWORD ret = EXCEPTION_ACCESS_VIOLATION;
 639
 640     if (view)
 641     {
 642         if (view->handlerProc)
 643         {
 644             if (view->handlerProc(view->handlerArg, addr)) ret = 0;  /* handled */
 645         }
 646         else
 647         {
 648             BYTE vprot = view->prot[((UINT)addr - view->base) >> page_shift];
 649             UINT page = (UINT)addr & ~page_mask;
 650             char *stack = (char *)NtCurrentTeb()->stack_base + SIGNAL_STACK_SIZE + page_mask + 1;
 651             if (vprot & VPROT_GUARD)
 652             {
 653                 VIRTUAL_SetProt( view, page, page_mask + 1, vprot & ~VPROT_GUARD );
 654                 ret = STATUS_GUARD_PAGE_VIOLATION;
 655             }
 656             /* is it inside the stack guard pages? */
 657             if (((char *)addr >= stack) && ((char *)addr < stack + 2*(page_mask+1)))
 658                 ret = STATUS_STACK_OVERFLOW;
 659         }
 660     }
 661     return ret;
 662 }
 663
 664
 665 /***********************************************************************
 666  *           VIRTUAL_mmap
 667  *
 668  * Wrapper for mmap() that handles anonymous mappings portably,
 669  * and falls back to read if mmap of a file fails.
 670  */
 671 LPVOID VIRTUAL_mmap( int unix_handle, LPVOID start, DWORD size,
 672                      DWORD offset, int prot, int flags )
 673 {
 674     int fd = -1;
 675     int pos;
 676     LPVOID ret;
 677
 678     if (unix_handle == -1)
 679     {
 680 #ifdef MAP_ANON
 681         flags |= MAP_ANON;
 682 #else
 683         static int fdzero = -1;
 684
 685         if (fdzero == -1)
 686         {
 687             if ((fdzero = open( "/dev/zero", O_RDONLY )) == -1)
 688             {
 689                 perror( "/dev/zero: open" );
 690                 ExitProcess(1);
 691             }
 692         }
 693         fd = fdzero;
 694 #endif  /* MAP_ANON */
 695         /* Linux EINVAL's on us if we don't pass MAP_PRIVATE to an anon mmap */
 696 #ifdef MAP_SHARED
 697         flags &= ~MAP_SHARED;
 698 #endif
 699 #ifdef MAP_PRIVATE
 700         flags |= MAP_PRIVATE;
 701 #endif
 702     }
 703     else fd = unix_handle;
 704
 705     if ((ret = mmap( start, size, prot, flags, fd, offset )) != (LPVOID)-1)
 706         return ret;
 707
 708     /* mmap() failed; if this is because the file offset is not    */
 709     /* page-aligned (EINVAL), or because the underlying filesystem */
 710     /* does not support mmap() (ENOEXEC,ENODEV), we do it by hand. */
 711
 712     if (unix_handle == -1) return ret;
 713     if ((errno != ENOEXEC) && (errno != EINVAL) && (errno != ENODEV)) return ret;
 714     if (prot & PROT_WRITE)
 715     {
 716         /* We cannot fake shared write mappings */
 717 #ifdef MAP_SHARED
 718         if (flags & MAP_SHARED) return ret;
 719 #endif
 720 #ifdef MAP_PRIVATE
 721         if (!(flags & MAP_PRIVATE)) return ret;
 722 #endif
 723     }
 724
 725     /* Reserve the memory with an anonymous mmap */
 726     ret = VIRTUAL_mmap( -1, start, size, 0, PROT_READ | PROT_WRITE, flags );
 727     if (ret == (LPVOID)-1) return ret;
 728     /* Now read in the file */
 729     if ((pos = lseek( fd, offset, SEEK_SET )) == -1)
 730     {
 731         munmap( ret, size );
 732         return (LPVOID)-1;
 733     }
 734     read( fd, ret, size );
 735     lseek( fd, pos, SEEK_SET );  /* Restore the file pointer */
 736     mprotect( ret, size, prot );  /* Set the right protection */
 737     return ret;
 738 }
 739
 740
 741 /***********************************************************************
 742  *             VirtualAlloc   (KERNEL32.548)
 743  * Reserves or commits a region of pages in virtual address space
 744  *
 745  * RETURNS
 746  *      Base address of allocated region of pages
 747  *      NULL: Failure
 748  */
 749 LPVOID WINAPI VirtualAlloc(
 750               LPVOID addr,  /* [in] Address of region to reserve or commit */
 751               DWORD size,   /* [in] Size of region */
 752               DWORD type,   /* [in] Type of allocation */
 753               DWORD protect /* [in] Type of access protection */
 754 ) {
 755     FILE_VIEW *view;
 756     UINT base, ptr, view_size;
 757     BYTE vprot;
 758
 759     TRACE("%08x %08lx %lx %08lx\n",
 760                      (UINT)addr, size, type, protect );
 761
 762     /* Round parameters to a page boundary */
 763
 764     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 765     {
 766         SetLastError( ERROR_OUTOFMEMORY );
 767         return NULL;
 768     }
 769     if (addr)
 770     {
 771         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 772             base = (UINT)addr & ~granularity_mask;
 773         else
 774             base = ROUND_ADDR( addr );
 775         size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
 776         if ((base <= granularity_mask) || (base + size < base))
 777         {
 778             /* disallow low 64k and wrap-around */
 779             SetLastError( ERROR_INVALID_PARAMETER );
 780             return NULL;
 781         }
 782     }
 783     else
 784     {
 785         base = 0;
 786         size = (size + page_mask) & ~page_mask;
 787     }
 788
 789     if (type & MEM_TOP_DOWN) {
 790         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 791          *        Is there _ANY_ way to do it with UNIX mmap()?
 792          */
 793         WARN("MEM_TOP_DOWN ignored\n");
 794         type &= ~MEM_TOP_DOWN;
 795     }
 796     /* Compute the alloc type flags */
 797
 798     if (!(type & (MEM_COMMIT | MEM_RESERVE | MEM_SYSTEM)) ||
 799         (type & ~(MEM_COMMIT | MEM_RESERVE | MEM_SYSTEM)))
 800     {
 801         ERR("called with wrong alloc type flags (%08lx) !\n", type);
 802         SetLastError( ERROR_INVALID_PARAMETER );
 803         return NULL;
 804     }
 805     if (type & (MEM_COMMIT | MEM_SYSTEM))
 806         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 807     else vprot = 0;
 808
 809     /* Reserve the memory */
 810
 811     if ((type & MEM_RESERVE) || !base)
 812     {
 813         view_size = size + (base ? 0 : granularity_mask + 1);
 814         if (type & MEM_SYSTEM)
 815              ptr = base;
 816         else
 817             ptr = (UINT)VIRTUAL_mmap( -1, (LPVOID)base, view_size, 0,
 818                                       VIRTUAL_GetUnixProt( vprot ), 0 );
 819         if (ptr == (UINT)-1)
 820         {
 821             SetLastError( ERROR_OUTOFMEMORY );
 822             return NULL;
 823         }
 824         if (!base)
 825         {
 826             /* Release the extra memory while keeping the range */
 827             /* starting on a 64k boundary. */
 828
 829             if (ptr & granularity_mask)
 830             {
 831                 UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
 832                 munmap( (void *)ptr, extra );
 833                 ptr += extra;
 834                 view_size -= extra;
 835             }
 836             if (view_size > size)
 837                 munmap( (void *)(ptr + size), view_size - size );
 838         }
 839         else if (ptr != base)
 840         {
 841             /* We couldn't get the address we wanted */
 842             munmap( (void *)ptr, view_size );
 843             SetLastError( ERROR_INVALID_ADDRESS );
 844             return NULL;
 845         }
 846         if (!(view = VIRTUAL_CreateView( ptr, size, (type & MEM_SYSTEM) ?
 847                                          VFLAG_SYSTEM : 0, vprot, -1 )))
 848         {
 849             munmap( (void *)ptr, size );
 850             SetLastError( ERROR_OUTOFMEMORY );
 851             return NULL;
 852         }
 853         return (LPVOID)ptr;
 854     }
 855
 856     /* Commit the pages */
 857
 858     if (!(view = VIRTUAL_FindView( base )) ||
 859         (base + size > view->base + view->size))
 860     {
 861         SetLastError( ERROR_INVALID_ADDRESS );
 862         return NULL;
 863     }
 864
 865     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 866     return (LPVOID)base;
 867 }
 868
 869
 870 /***********************************************************************
 871  *             VirtualAllocEx   (KERNEL32.548)
 872  *
 873  * Seems to be just as VirtualAlloc, but with process handle.
 874  */
 875 LPVOID WINAPI VirtualAllocEx(
 876               HANDLE hProcess, /* [in] Handle of process to do mem operation */
 877               LPVOID addr,  /* [in] Address of region to reserve or commit */
 878               DWORD size,   /* [in] Size of region */
 879               DWORD type,   /* [in] Type of allocation */
 880               DWORD protect /* [in] Type of access protection */
 881 ) {
 882     if (MapProcessHandle( hProcess ) == GetCurrentProcessId())
 883         return VirtualAlloc( addr, size, type, protect );
 884     ERR("Unsupported on other process\n");
 885     return NULL;
 886 }
 887
 888
 889 /***********************************************************************
 890  *             VirtualFree   (KERNEL32.550)
 891  * Release or decommits a region of pages in virtual address space.
 892  *
 893  * RETURNS
 894  *      TRUE: Success
 895  *      FALSE: Failure
 896  */
 897 BOOL WINAPI VirtualFree(
 898               LPVOID addr, /* [in] Address of region of committed pages */
 899               DWORD size,  /* [in] Size of region */
 900               DWORD type   /* [in] Type of operation */
 901 ) {
 902     FILE_VIEW *view;
 903     UINT base;
 904
 905     TRACE("%08x %08lx %lx\n",
 906                      (UINT)addr, size, type );
 907
 908     /* Fix the parameters */
 909
 910     size = ROUND_SIZE( addr, size );
 911     base = ROUND_ADDR( addr );
 912
 913     if (!(view = VIRTUAL_FindView( base )) ||
 914         (base + size > view->base + view->size))
 915     {
 916         SetLastError( ERROR_INVALID_PARAMETER );
 917         return FALSE;
 918     }
 919
 920     /* Compute the protection flags */
 921
 922     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 923     {
 924         ERR("called with wrong free type flags (%08lx) !\n", type);
 925         SetLastError( ERROR_INVALID_PARAMETER );
 926         return FALSE;
 927     }
 928
 929     /* Free the pages */
 930
 931     if (type == MEM_RELEASE)
 932     {
 933         if (size || (base != view->base))
 934         {
 935             SetLastError( ERROR_INVALID_PARAMETER );
 936             return FALSE;
 937         }
 938         VIRTUAL_DeleteView( view );
 939         return TRUE;
 940     }
 941
 942     /* Decommit the pages by remapping zero-pages instead */
 943
 944     if (VIRTUAL_mmap( -1, (LPVOID)base, size, 0, VIRTUAL_GetUnixProt( 0 ),
 945                       MAP_FIXED ) != (LPVOID)base)
 946         ERR( "Could not remap pages, expect trouble\n" );
 947     return VIRTUAL_SetProt( view, base, size, 0 );
 948 }
 949
 950
 951 /***********************************************************************
 952  *             VirtualLock   (KERNEL32.551)
 953  * Locks the specified region of virtual address space
 954  *
 955  * NOTE
 956  *      Always returns TRUE
 957  *
 958  * RETURNS
 959  *      TRUE: Success
 960  *      FALSE: Failure
 961  */
 962 BOOL WINAPI VirtualLock(
 963               LPVOID addr, /* [in] Address of first byte of range to lock */
 964               DWORD size   /* [in] Number of bytes in range to lock */
 965 ) {
 966     return TRUE;
 967 }
 968
 969
 970 /***********************************************************************
 971  *             VirtualUnlock   (KERNEL32.556)
 972  * Unlocks a range of pages in the virtual address space
 973  *
 974  * NOTE
 975  *      Always returns TRUE
 976  *
 977  * RETURNS
 978  *      TRUE: Success
 979  *      FALSE: Failure
 980  */
 981 BOOL WINAPI VirtualUnlock(
 982               LPVOID addr, /* [in] Address of first byte of range */
 983               DWORD size   /* [in] Number of bytes in range */
 984 ) {
 985     return TRUE;
 986 }
 987
 988
 989 /***********************************************************************
 990  *             VirtualProtect   (KERNEL32.552)
 991  * Changes the access protection on a region of committed pages
 992  *
 993  * RETURNS
 994  *      TRUE: Success
 995  *      FALSE: Failure
 996  */
 997 BOOL WINAPI VirtualProtect(
 998               LPVOID addr,     /* [in] Address of region of committed pages */
 999               DWORD size,      /* [in] Size of region */
1000               DWORD new_prot,  /* [in] Desired access protection */
1001               LPDWORD old_prot /* [out] Address of variable to get old protection */
1002 ) {
1003     FILE_VIEW *view;
1004     UINT base, i;
1005     BYTE vprot, *p;
1006
1007     TRACE("%08x %08lx %08lx\n",
1008                      (UINT)addr, size, new_prot );
1009
1010     /* Fix the parameters */
1011
1012     size = ROUND_SIZE( addr, size );
1013     base = ROUND_ADDR( addr );
1014
1015     if (!(view = VIRTUAL_FindView( base )) ||
1016         (base + size > view->base + view->size))
1017     {
1018         SetLastError( ERROR_INVALID_PARAMETER );
1019         return FALSE;
1020     }
1021
1022     /* Make sure all the pages are committed */
1023
1024     p = view->prot + ((base - view->base) >> page_shift);
1025     for (i = size >> page_shift; i; i--, p++)
1026     {
1027         if (!(*p & VPROT_COMMITTED))
1028         {
1029             SetLastError( ERROR_INVALID_PARAMETER );
1030             return FALSE;
1031         }
1032     }
1033
1034     if (old_prot) VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
1035     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
1036     return VIRTUAL_SetProt( view, base, size, vprot );
1037 }
1038
1039
1040 /***********************************************************************
1041  *             VirtualProtectEx   (KERNEL32.553)
1042  * Changes the access protection on a region of committed pages in the
1043  * virtual address space of a specified process
1044  *
1045  * RETURNS
1046  *      TRUE: Success
1047  *      FALSE: Failure
1048  */
1049 BOOL WINAPI VirtualProtectEx(
1050               HANDLE handle, /* [in]  Handle of process */
1051               LPVOID addr,     /* [in]  Address of region of committed pages */
1052               DWORD size,      /* [in]  Size of region */
1053               DWORD new_prot,  /* [in]  Desired access protection */
1054               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
1055 {
1056     if (MapProcessHandle( handle ) == GetCurrentProcessId())
1057         return VirtualProtect( addr, size, new_prot, old_prot );
1058     ERR("Unsupported on other process\n");
1059     return FALSE;
1060 }
1061
1062
1063 /***********************************************************************
1064  *             VirtualQuery   (KERNEL32.554)
1065  * Provides info about a range of pages in virtual address space
1066  *
1067  * RETURNS
1068  *      Number of bytes returned in information buffer
1069  */
1070 DWORD WINAPI VirtualQuery(
1071              LPCVOID addr,                    /* [in]  Address of region */
1072              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
1073              DWORD len                        /* [in]  Size of buffer */
1074 ) {
1075     FILE_VIEW *view;
1076     UINT base = ROUND_ADDR( addr );
1077     UINT alloc_base = 0;
1078     UINT size = 0;
1079
1080     /* Find the view containing the address */
1081
1082     EnterCriticalSection(&csVirtual);
1083     view = VIRTUAL_FirstView;
1084     for (;;)
1085     {
1086         if (!view)
1087         {
1088             size = 0xffff0000 - alloc_base;
1089             break;
1090         }
1091         if (view->base > base)
1092         {
1093             size = view->base - alloc_base;
1094             view = NULL;
1095             break;
1096         }
1097         if (view->base + view->size > base)
1098         {
1099             alloc_base = view->base;
1100             size = view->size;
1101             break;
1102         }
1103         alloc_base = view->base + view->size;
1104         view = view->next;
1105     }
1106     LeaveCriticalSection(&csVirtual);
1107
1108     /* Fill the info structure */
1109
1110     if (!view)
1111     {
1112         info->State             = MEM_FREE;
1113         info->Protect           = 0;
1114         info->AllocationProtect = 0;
1115         info->Type              = 0;
1116     }
1117     else
1118     {
1119         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
1120         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
1121         for (size = base - alloc_base; size < view->size; size += page_mask+1)
1122             if (view->prot[size >> page_shift] != vprot) break;
1123         info->AllocationProtect = view->protect;
1124         info->Type              = MEM_PRIVATE;  /* FIXME */
1125     }
1126
1127     info->BaseAddress    = (LPVOID)base;
1128     info->AllocationBase = (LPVOID)alloc_base;
1129     info->RegionSize     = size - (base - alloc_base);
1130     return sizeof(*info);
1131 }
1132
1133
1134 /***********************************************************************
1135  *             VirtualQueryEx   (KERNEL32.555)
1136  * Provides info about a range of pages in virtual address space of a
1137  * specified process
1138  *
1139  * RETURNS
1140  *      Number of bytes returned in information buffer
1141  */
1142 DWORD WINAPI VirtualQueryEx(
1143              HANDLE handle,                 /* [in] Handle of process */
1144              LPCVOID addr,                    /* [in] Address of region */
1145              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
1146              DWORD len                        /* [in] Size of buffer */ )
1147 {
1148     if (MapProcessHandle( handle ) == GetCurrentProcessId())
1149         return VirtualQuery( addr, info, len );
1150     ERR("Unsupported on other process\n");
1151     return 0;
1152 }
1153
1154
1155 /***********************************************************************
1156  *             IsBadReadPtr   (KERNEL32.354)
1157  *
1158  * RETURNS
1159  *      FALSE: Process has read access to entire block
1160  *      TRUE: Otherwise
1161  */
1162 BOOL WINAPI IsBadReadPtr(
1163               LPCVOID ptr, /* Address of memory block */
1164               UINT size )  /* Size of block */
1165 {
1166     if (!size) return FALSE;  /* handle 0 size case w/o reference */
1167     __TRY
1168     {
1169         volatile const char *p = ptr;
1170         char dummy;
1171         UINT count = size;
1172
1173         while (count > page_size)
1174         {
1175             dummy = *p;
1176             p += page_size;
1177             count -= page_size;
1178         }
1179         dummy = p[0];
1180         dummy = p[count - 1];
1181     }
1182     __EXCEPT(page_fault) { return TRUE; }
1183     __ENDTRY
1184     return FALSE;
1185 }
1186
1187
1188 /***********************************************************************
1189  *             IsBadWritePtr   (KERNEL32.357)
1190  *
1191  * RETURNS
1192  *      FALSE: Process has write access to entire block
1193  *      TRUE: Otherwise
1194  */
1195 BOOL WINAPI IsBadWritePtr(
1196               LPVOID ptr, /* [in] Address of memory block */
1197               UINT size ) /* [in] Size of block in bytes */
1198 {
1199     if (!size) return FALSE;  /* handle 0 size case w/o reference */
1200     __TRY
1201     {
1202         volatile char *p = ptr;
1203         UINT count = size;
1204
1205         while (count > page_size)
1206         {
1207             *p |= 0;
1208             p += page_size;
1209             count -= page_size;
1210         }
1211         p[0] |= 0;
1212         p[count - 1] |= 0;
1213     }
1214     __EXCEPT(page_fault) { return TRUE; }
1215     __ENDTRY
1216     return FALSE;
1217 }
1218
1219
1220 /***********************************************************************
1221  *             IsBadHugeReadPtr   (KERNEL32.352)
1222  * RETURNS
1223  *      FALSE: Process has read access to entire block
1224  *      TRUE: Otherwise
1225  */
1226 BOOL WINAPI IsBadHugeReadPtr(
1227               LPCVOID ptr, /* [in] Address of memory block */
1228               UINT size  /* [in] Size of block */
1229 ) {
1230     return IsBadReadPtr( ptr, size );
1231 }
1232
1233
1234 /***********************************************************************
1235  *             IsBadHugeWritePtr   (KERNEL32.353)
1236  * RETURNS
1237  *      FALSE: Process has write access to entire block
1238  *      TRUE: Otherwise
1239  */
1240 BOOL WINAPI IsBadHugeWritePtr(
1241               LPVOID ptr, /* [in] Address of memory block */
1242               UINT size /* [in] Size of block */
1243 ) {
1244     return IsBadWritePtr( ptr, size );
1245 }
1246
1247
1248 /***********************************************************************
1249  *             IsBadCodePtr   (KERNEL32.351)
1250  *
1251  * RETURNS
1252  *      FALSE: Process has read access to specified memory
1253  *      TRUE: Otherwise
1254  */
1255 BOOL WINAPI IsBadCodePtr( FARPROC ptr ) /* [in] Address of function */
1256 {
1257     return IsBadReadPtr( ptr, 1 );
1258 }
1259
1260
1261 /***********************************************************************
1262  *             IsBadStringPtrA   (KERNEL32.355)
1263  *
1264  * RETURNS
1265  *      FALSE: Read access to all bytes in string
1266  *      TRUE: Else
1267  */
1268 BOOL WINAPI IsBadStringPtrA(
1269               LPCSTR str, /* [in] Address of string */
1270               UINT max )  /* [in] Maximum size of string */
1271 {
1272     __TRY
1273     {
1274         volatile const char *p = str;
1275         while (p != str + max) if (!*p++) break;
1276     }
1277     __EXCEPT(page_fault) { return TRUE; }
1278     __ENDTRY
1279     return FALSE;
1280 }
1281
1282
1283 /***********************************************************************
1284  *             IsBadStringPtrW   (KERNEL32.356)
1285  * See IsBadStringPtrA
1286  */
1287 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
1288 {
1289     __TRY
1290     {
1291         volatile const WCHAR *p = str;
1292         while (p != str + max) if (!*p++) break;
1293     }
1294     __EXCEPT(page_fault) { return TRUE; }
1295     __ENDTRY
1296     return FALSE;
1297 }
1298
1299
1300 /***********************************************************************
1301  *             CreateFileMappingA   (KERNEL32.46)
1302  * Creates a named or unnamed file-mapping object for the specified file
1303  *
1304  * RETURNS
1305  *      Handle: Success
1306  *      0: Mapping object does not exist
1307  *      NULL: Failure
1308  */
1309 HANDLE WINAPI CreateFileMappingA(
1310                 HANDLE hFile,   /* [in] Handle of file to map */
1311                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1312                 DWORD protect,   /* [in] Protection for mapping object */
1313                 DWORD size_high, /* [in] High-order 32 bits of object size */
1314                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1315                 LPCSTR name      /* [in] Name of file-mapping object */ )
1316 {
1317     HANDLE ret;
1318     BYTE vprot;
1319     DWORD len = name ? MultiByteToWideChar( CP_ACP, 0, name, strlen(name), NULL, 0 ) : 0;
1320
1321     /* Check parameters */
1322
1323     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1324           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1325
1326     if (len > MAX_PATH)
1327     {
1328         SetLastError( ERROR_FILENAME_EXCED_RANGE );
1329         return 0;
1330     }
1331     vprot = VIRTUAL_GetProt( protect );
1332     if (protect & SEC_RESERVE)
1333     {
1334         if (hFile != INVALID_HANDLE_VALUE)
1335         {
1336             SetLastError( ERROR_INVALID_PARAMETER );
1337             return 0;
1338         }
1339     }
1340     else vprot |= VPROT_COMMITTED;
1341     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1342     if (protect & SEC_IMAGE) vprot |= VPROT_IMAGE;
1343
1344     /* Create the server object */
1345
1346     SERVER_START_REQ
1347     {
1348         struct create_mapping_request *req = server_alloc_req( sizeof(*req),
1349                                                                len * sizeof(WCHAR) );
1350         req->file_handle = hFile;
1351         req->size_high   = size_high;
1352         req->size_low    = size_low;
1353         req->protect     = vprot;
1354         req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1355         if (len) MultiByteToWideChar( CP_ACP, 0, name, strlen(name), server_data_ptr(req), len );
1356         SetLastError(0);
1357         server_call( REQ_CREATE_MAPPING );
1358         ret = req->handle;
1359     }
1360     SERVER_END_REQ;
1361     if (ret == -1) ret = 0; /* must return 0 on failure, not -1 */
1362     return ret;
1363 }
1364
1365
1366 /***********************************************************************
1367  *             CreateFileMappingW   (KERNEL32.47)
1368  * See CreateFileMappingA
1369  */
1370 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
1371                                   DWORD protect, DWORD size_high,
1372                                   DWORD size_low, LPCWSTR name )
1373 {
1374     HANDLE ret;
1375     BYTE vprot;
1376     DWORD len = name ? strlenW(name) : 0;
1377
1378     /* Check parameters */
1379
1380     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1381           hFile, sa, protect, size_high, size_low, debugstr_w(name) );
1382
1383     if (len > MAX_PATH)
1384     {
1385         SetLastError( ERROR_FILENAME_EXCED_RANGE );
1386         return 0;
1387     }
1388
1389     vprot = VIRTUAL_GetProt( protect );
1390     if (protect & SEC_RESERVE)
1391     {
1392         if (hFile != INVALID_HANDLE_VALUE)
1393         {
1394             SetLastError( ERROR_INVALID_PARAMETER );
1395             return 0;
1396         }
1397     }
1398     else vprot |= VPROT_COMMITTED;
1399     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1400     if (protect & SEC_IMAGE) vprot |= VPROT_IMAGE;
1401
1402     /* Create the server object */
1403
1404     SERVER_START_REQ
1405     {
1406         struct create_mapping_request *req = server_alloc_req( sizeof(*req),
1407                                                                len * sizeof(WCHAR) );
1408         req->file_handle = hFile;
1409         req->size_high   = size_high;
1410         req->size_low    = size_low;
1411         req->protect     = vprot;
1412         req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1413         memcpy( server_data_ptr(req), name, len * sizeof(WCHAR) );
1414         SetLastError(0);
1415         server_call( REQ_CREATE_MAPPING );
1416         ret = req->handle;
1417     }
1418     SERVER_END_REQ;
1419     if (ret == -1) ret = 0; /* must return 0 on failure, not -1 */
1420     return ret;
1421 }
1422
1423
1424 /***********************************************************************
1425  *             OpenFileMappingA   (KERNEL32.397)
1426  * Opens a named file-mapping object.
1427  *
1428  * RETURNS
1429  *      Handle: Success
1430  *      NULL: Failure
1431  */
1432 HANDLE WINAPI OpenFileMappingA(
1433                 DWORD access,   /* [in] Access mode */
1434                 BOOL inherit, /* [in] Inherit flag */
1435                 LPCSTR name )   /* [in] Name of file-mapping object */
1436 {
1437     HANDLE ret;
1438     DWORD len = name ? MultiByteToWideChar( CP_ACP, 0, name, strlen(name), NULL, 0 ) : 0;
1439     if (len > MAX_PATH)
1440     {
1441         SetLastError( ERROR_FILENAME_EXCED_RANGE );
1442         return 0;
1443     }
1444     SERVER_START_REQ
1445     {
1446         struct open_mapping_request *req = server_alloc_req( sizeof(*req), len * sizeof(WCHAR) );
1447
1448         req->access  = access;
1449         req->inherit = inherit;
1450         if (len) MultiByteToWideChar( CP_ACP, 0, name, strlen(name), server_data_ptr(req), len );
1451         server_call( REQ_OPEN_MAPPING );
1452         ret = req->handle;
1453     }
1454     SERVER_END_REQ;
1455     if (ret == -1) ret = 0; /* must return 0 on failure, not -1 */
1456     return ret;
1457 }
1458
1459
1460 /***********************************************************************
1461  *             OpenFileMappingW   (KERNEL32.398)
1462  * See OpenFileMappingA
1463  */
1464 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
1465 {
1466     HANDLE ret;
1467     DWORD len = name ? strlenW(name) : 0;
1468     if (len > MAX_PATH)
1469     {
1470         SetLastError( ERROR_FILENAME_EXCED_RANGE );
1471         return 0;
1472     }
1473     SERVER_START_REQ
1474     {
1475         struct open_mapping_request *req = server_alloc_req( sizeof(*req), len * sizeof(WCHAR) );
1476
1477         req->access  = access;
1478         req->inherit = inherit;
1479         memcpy( server_data_ptr(req), name, len * sizeof(WCHAR) );
1480         server_call( REQ_OPEN_MAPPING );
1481         ret = req->handle;
1482     }
1483     SERVER_END_REQ;
1484     if (ret == -1) ret = 0; /* must return 0 on failure, not -1 */
1485     return ret;
1486 }
1487
1488
1489 /***********************************************************************
1490  *             MapViewOfFile   (KERNEL32.385)
1491  * Maps a view of a file into the address space
1492  *
1493  * RETURNS
1494  *      Starting address of mapped view
1495  *      NULL: Failure
1496  */
1497 LPVOID WINAPI MapViewOfFile(
1498               HANDLE mapping,  /* [in] File-mapping object to map */
1499               DWORD access,      /* [in] Access mode */
1500               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1501               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1502               DWORD count        /* [in] Number of bytes to map */
1503 ) {
1504     return MapViewOfFileEx( mapping, access, offset_high,
1505                             offset_low, count, NULL );
1506 }
1507
1508
1509 /***********************************************************************
1510  *             MapViewOfFileEx   (KERNEL32.386)
1511  * Maps a view of a file into the address space
1512  *
1513  * RETURNS
1514  *      Starting address of mapped view
1515  *      NULL: Failure
1516  */
1517 LPVOID WINAPI MapViewOfFileEx(
1518               HANDLE handle,   /* [in] File-mapping object to map */
1519               DWORD access,      /* [in] Access mode */
1520               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1521               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1522               DWORD count,       /* [in] Number of bytes to map */
1523               LPVOID addr        /* [in] Suggested starting address for mapped view */
1524 ) {
1525     FILE_VIEW *view;
1526     UINT ptr = (UINT)-1, size = 0;
1527     int flags = MAP_PRIVATE;
1528     int unix_handle = -1;
1529     int prot;
1530     struct get_mapping_info_request *req = get_req_buffer();
1531
1532     /* Check parameters */
1533
1534     if ((offset_low & granularity_mask) ||
1535         (addr && ((UINT)addr & granularity_mask)))
1536     {
1537         SetLastError( ERROR_INVALID_PARAMETER );
1538         return NULL;
1539     }
1540
1541     req->handle = handle;
1542     if (server_call_fd( REQ_GET_MAPPING_INFO, -1, &unix_handle )) goto error;
1543     prot = req->protect;
1544
1545     if (prot & VPROT_IMAGE)
1546         return map_image( handle, unix_handle, req->base, req->size_low, req->header_size,
1547                           req->shared_file, req->shared_size );
1548
1549     if (req->size_high || offset_high)
1550         ERR("Offsets larger than 4Gb not supported\n");
1551
1552     if ((offset_low >= req->size_low) ||
1553         (count > req->size_low - offset_low))
1554     {
1555         SetLastError( ERROR_INVALID_PARAMETER );
1556         goto error;
1557     }
1558     if (count) size = ROUND_SIZE( offset_low, count );
1559     else size = req->size_low - offset_low;
1560
1561     switch(access)
1562     {
1563     case FILE_MAP_ALL_ACCESS:
1564     case FILE_MAP_WRITE:
1565     case FILE_MAP_WRITE | FILE_MAP_READ:
1566         if (!(prot & VPROT_WRITE))
1567         {
1568             SetLastError( ERROR_INVALID_PARAMETER );
1569             goto error;
1570         }
1571         flags = MAP_SHARED;
1572         /* fall through */
1573     case FILE_MAP_READ:
1574     case FILE_MAP_COPY:
1575     case FILE_MAP_COPY | FILE_MAP_READ:
1576         if (prot & VPROT_READ) break;
1577         /* fall through */
1578     default:
1579         SetLastError( ERROR_INVALID_PARAMETER );
1580         goto error;
1581     }
1582
1583     /* FIXME: If a mapping is created with SEC_RESERVE and a process,
1584      * which has a view of this mapping commits some pages, they will
1585      * appear commited in all other processes, which have the same
1586      * view created. Since we don`t support this yet, we create the
1587      * whole mapping commited.
1588      */
1589     prot |= VPROT_COMMITTED;
1590
1591     /* Map the file */
1592
1593     TRACE("handle=%x size=%x offset=%lx\n", handle, size, offset_low );
1594
1595     ptr = (UINT)VIRTUAL_mmap( unix_handle, addr, size, offset_low,
1596                               VIRTUAL_GetUnixProt( prot ), flags );
1597     if (ptr == (UINT)-1) {
1598         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1599          * Platform Differences":
1600          * Windows NT: ERROR_INVALID_PARAMETER
1601          * Windows 95: ERROR_INVALID_ADDRESS.
1602          * FIXME: So should we add a module dependend check here? -MM
1603          */
1604         if (errno==ENOMEM)
1605             SetLastError( ERROR_OUTOFMEMORY );
1606         else
1607             SetLastError( ERROR_INVALID_PARAMETER );
1608         goto error;
1609     }
1610
1611     if (!(view = VIRTUAL_CreateView( ptr, size, 0, prot, handle )))
1612     {
1613         SetLastError( ERROR_OUTOFMEMORY );
1614         goto error;
1615     }
1616     if (unix_handle != -1) close( unix_handle );
1617     return (LPVOID)ptr;
1618
1619 error:
1620     if (unix_handle != -1) close( unix_handle );
1621     if (ptr != (UINT)-1) munmap( (void *)ptr, size );
1622     return NULL;
1623 }
1624
1625
1626 /***********************************************************************
1627  *             FlushViewOfFile   (KERNEL32.262)
1628  * Writes to the disk a byte range within a mapped view of a file
1629  *
1630  * RETURNS
1631  *      TRUE: Success
1632  *      FALSE: Failure
1633  */
1634 BOOL WINAPI FlushViewOfFile(
1635               LPCVOID base, /* [in] Start address of byte range to flush */
1636               DWORD cbFlush /* [in] Number of bytes in range */
1637 ) {
1638     FILE_VIEW *view;
1639     UINT addr = ROUND_ADDR( base );
1640
1641     TRACE("FlushViewOfFile at %p for %ld bytes\n",
1642                      base, cbFlush );
1643
1644     if (!(view = VIRTUAL_FindView( addr )))
1645     {
1646         SetLastError( ERROR_INVALID_PARAMETER );
1647         return FALSE;
1648     }
1649     if (!cbFlush) cbFlush = view->size;
1650     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1651     SetLastError( ERROR_INVALID_PARAMETER );
1652     return FALSE;
1653 }
1654
1655
1656 /***********************************************************************
1657  *             UnmapViewOfFile   (KERNEL32.540)
1658  * Unmaps a mapped view of a file.
1659  *
1660  * NOTES
1661  *      Should addr be an LPCVOID?
1662  *
1663  * RETURNS
1664  *      TRUE: Success
1665  *      FALSE: Failure
1666  */
1667 BOOL WINAPI UnmapViewOfFile(
1668               LPVOID addr /* [in] Address where mapped view begins */
1669 ) {
1670     FILE_VIEW *view;
1671     UINT base = ROUND_ADDR( addr );
1672     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1673     {
1674         SetLastError( ERROR_INVALID_PARAMETER );
1675         return FALSE;
1676     }
1677     VIRTUAL_DeleteView( view );
1678     return TRUE;
1679 }
1680
1681 /***********************************************************************
1682  *             VIRTUAL_MapFileW
1683  *
1684  * Helper function to map a file to memory:
1685  *  name                        -       file name
1686  *  [RETURN] ptr                -       pointer to mapped file
1687  */
1688 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1689 {
1690     HANDLE hFile, hMapping;
1691     LPVOID ptr = NULL;
1692
1693     hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1694                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1695     if (hFile != INVALID_HANDLE_VALUE)
1696     {
1697         hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1698         CloseHandle( hFile );
1699         if (hMapping)
1700         {
1701             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1702             CloseHandle( hMapping );
1703         }
1704     }
1705     return ptr;
1706 }