2 * Win32 virtual memory functions
4 * Copyright 1997 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 #include "wine/port.h"
28 #include <sys/types.h>
33 #define NONAMELESSUNION
34 #define NONAMELESSSTRUCT
36 #define WIN32_NO_STATUS
42 #include "wine/exception.h"
44 #include "wine/debug.h"
46 #include "kernel_private.h"
48 WINE_DECLARE_DEBUG_CHANNEL(seh);
50 static unsigned int page_size;
53 /***********************************************************************
54 * VirtualAlloc (KERNEL32.@)
56 * Reserves or commits a region of pages in virtual address space.
59 * addr [I] Address of region to reserve or commit.
60 * size [I] Size of region.
61 * type [I] Type of allocation.
62 * protect [I] Type of access protection.
65 * Success: Base address of allocated region of pages.
68 LPVOID WINAPI VirtualAlloc( LPVOID addr, SIZE_T size, DWORD type, DWORD protect )
70 return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
74 /***********************************************************************
75 * VirtualAllocEx (KERNEL32.@)
77 * Seems to be just as VirtualAlloc, but with process handle.
80 * hProcess [I] Handle to process to do mem operation.
81 * addr [I] Address of region to reserve or commit.
82 * size [I] Size of region.
83 * type [I] Type of allocation.
84 * protect [I] Type of access protection.
88 * Success: Base address of allocated region of pages.
91 LPVOID WINAPI VirtualAllocEx( HANDLE hProcess, LPVOID addr, SIZE_T size,
92 DWORD type, DWORD protect )
97 if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
99 SetLastError( RtlNtStatusToDosError(status) );
106 /***********************************************************************
107 * VirtualFree (KERNEL32.@)
109 * Releases or decommits a region of pages in virtual address space.
112 * addr [I] Address of region of committed pages.
113 * size [I] Size of region.
114 * type [I] Type of operation.
120 BOOL WINAPI VirtualFree( LPVOID addr, SIZE_T size, DWORD type )
122 return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
126 /***********************************************************************
127 * VirtualFreeEx (KERNEL32.@)
129 * Releases or decommits a region of pages in virtual address space.
132 * process [I] Handle to process.
133 * addr [I] Address of region to free.
134 * size [I] Size of region.
135 * type [I] Type of operation.
141 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
143 NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
144 if (status) SetLastError( RtlNtStatusToDosError(status) );
149 /***********************************************************************
150 * VirtualLock (KERNEL32.@)
152 * Locks the specified region of virtual address space.
155 * addr [I] Address of first byte of range to lock.
156 * size [I] Number of bytes in range to lock.
163 * Always returns TRUE.
166 BOOL WINAPI VirtualLock( LPVOID addr, SIZE_T size )
168 NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
169 if (status) SetLastError( RtlNtStatusToDosError(status) );
174 /***********************************************************************
175 * VirtualUnlock (KERNEL32.@)
177 * Unlocks a range of pages in the virtual address space.
180 * addr [I] Address of first byte of range.
181 * size [I] Number of bytes in range.
188 * Always returns TRUE.
191 BOOL WINAPI VirtualUnlock( LPVOID addr, SIZE_T size )
193 NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
194 if (status) SetLastError( RtlNtStatusToDosError(status) );
199 /***********************************************************************
200 * VirtualProtect (KERNEL32.@)
202 * Changes the access protection on a region of committed pages.
205 * addr [I] Address of region of committed pages.
206 * size [I] Size of region.
207 * new_prot [I] Desired access protection.
208 * old_prot [O] Address of variable to get old protection.
214 BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD old_prot)
216 return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
220 /***********************************************************************
221 * VirtualProtectEx (KERNEL32.@)
223 * Changes the access protection on a region of committed pages in the
224 * virtual address space of a specified process.
227 * process [I] Handle of process.
228 * addr [I] Address of region of committed pages.
229 * size [I] Size of region.
230 * new_prot [I] Desired access protection.
231 * old_prot [O] Address of variable to get old protection.
237 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
238 DWORD new_prot, LPDWORD old_prot )
240 NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
241 if (status) SetLastError( RtlNtStatusToDosError(status) );
246 /***********************************************************************
247 * VirtualQuery (KERNEL32.@)
249 * Provides info about a range of pages in virtual address space.
252 * addr [I] Address of region.
253 * info [O] Address of info buffer.
254 * len [I] Size of buffer.
257 * Number of bytes returned in information buffer or 0 if
258 * addr >= 0xc0000000 (kernel space).
260 SIZE_T WINAPI VirtualQuery( LPCVOID addr, PMEMORY_BASIC_INFORMATION info,
263 return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
267 /***********************************************************************
268 * VirtualQueryEx (KERNEL32.@)
270 * Provides info about a range of pages in virtual address space of a
274 * process [I] Handle to process.
275 * addr [I] Address of region.
276 * info [O] Address of info buffer.
277 * len [I] Size of buffer.
280 * Number of bytes returned in information buffer.
282 SIZE_T WINAPI VirtualQueryEx( HANDLE process, LPCVOID addr,
283 PMEMORY_BASIC_INFORMATION info, SIZE_T len )
288 if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
290 SetLastError( RtlNtStatusToDosError(status) );
297 /***********************************************************************
298 * CreateFileMappingA (KERNEL32.@)
300 * Creates a named or unnamed file-mapping object for the specified file.
303 * hFile [I] Handle to the file to map.
304 * sa [I] Optional security attributes.
305 * protect [I] Protection for mapping object.
306 * size_high [I] High-order 32 bits of object size.
307 * size_low [I] Low-order 32 bits of object size.
308 * name [I] Name of file-mapping object.
312 * Failure: NULL. Mapping object does not exist.
314 HANDLE WINAPI CreateFileMappingA( HANDLE hFile, SECURITY_ATTRIBUTES *sa,
315 DWORD protect, DWORD size_high, DWORD size_low, LPCSTR name )
317 WCHAR buffer[MAX_PATH];
319 if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
321 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
323 SetLastError( ERROR_FILENAME_EXCED_RANGE );
326 return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
330 /***********************************************************************
331 * CreateFileMappingW (KERNEL32.@)
333 * See CreateFileMappingA.
335 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
336 DWORD protect, DWORD size_high,
337 DWORD size_low, LPCWSTR name )
339 static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
342 OBJECT_ATTRIBUTES attr;
343 UNICODE_STRING nameW;
345 DWORD access, sec_type;
348 attr.Length = sizeof(attr);
349 attr.RootDirectory = 0;
350 attr.ObjectName = NULL;
351 attr.Attributes = OBJ_CASE_INSENSITIVE | OBJ_OPENIF |
352 ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
353 attr.SecurityDescriptor = sa ? sa->lpSecurityDescriptor : NULL;
354 attr.SecurityQualityOfService = NULL;
358 RtlInitUnicodeString( &nameW, name );
359 attr.ObjectName = &nameW;
360 attr.RootDirectory = get_BaseNamedObjects_handle();
363 sec_type = protect & sec_flags;
364 protect &= ~sec_flags;
365 if (!sec_type) sec_type = SEC_COMMIT;
370 protect = PAGE_READONLY; /* Win9x compatibility */
374 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ;
377 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE;
380 SetLastError( ERROR_INVALID_PARAMETER );
384 if (hFile == INVALID_HANDLE_VALUE)
387 if (!size_low && !size_high)
389 SetLastError( ERROR_INVALID_PARAMETER );
394 size.u.LowPart = size_low;
395 size.u.HighPart = size_high;
397 status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
398 if (status == STATUS_OBJECT_NAME_EXISTS)
399 SetLastError( ERROR_ALREADY_EXISTS );
401 SetLastError( RtlNtStatusToDosError(status) );
406 /***********************************************************************
407 * OpenFileMappingA (KERNEL32.@)
409 * Opens a named file-mapping object.
412 * access [I] Access mode.
413 * inherit [I] Inherit flag.
414 * name [I] Name of file-mapping object.
420 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
422 WCHAR buffer[MAX_PATH];
424 if (!name) return OpenFileMappingW( access, inherit, NULL );
426 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
428 SetLastError( ERROR_FILENAME_EXCED_RANGE );
431 return OpenFileMappingW( access, inherit, buffer );
435 /***********************************************************************
436 * OpenFileMappingW (KERNEL32.@)
438 * See OpenFileMappingA.
440 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
442 OBJECT_ATTRIBUTES attr;
443 UNICODE_STRING nameW;
449 SetLastError( ERROR_INVALID_PARAMETER );
452 attr.Length = sizeof(attr);
453 attr.RootDirectory = get_BaseNamedObjects_handle();
454 attr.ObjectName = &nameW;
455 attr.Attributes = OBJ_CASE_INSENSITIVE | (inherit ? OBJ_INHERIT : 0);
456 attr.SecurityDescriptor = NULL;
457 attr.SecurityQualityOfService = NULL;
458 RtlInitUnicodeString( &nameW, name );
460 if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
462 if ((status = NtOpenSection( &ret, access, &attr )))
464 SetLastError( RtlNtStatusToDosError(status) );
471 /***********************************************************************
472 * MapViewOfFile (KERNEL32.@)
474 * Maps a view of a file into the address space.
477 * mapping [I] File-mapping object to map.
478 * access [I] Access mode.
479 * offset_high [I] High-order 32 bits of file offset.
480 * offset_low [I] Low-order 32 bits of file offset.
481 * count [I] Number of bytes to map.
484 * Success: Starting address of mapped view.
487 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
488 DWORD offset_high, DWORD offset_low, SIZE_T count )
490 return MapViewOfFileEx( mapping, access, offset_high,
491 offset_low, count, NULL );
495 /***********************************************************************
496 * MapViewOfFileEx (KERNEL32.@)
498 * Maps a view of a file into the address space.
501 * handle [I] File-mapping object to map.
502 * access [I] Access mode.
503 * offset_high [I] High-order 32 bits of file offset.
504 * offset_low [I] Low-order 32 bits of file offset.
505 * count [I] Number of bytes to map.
506 * addr [I] Suggested starting address for mapped view.
509 * Success: Starting address of mapped view.
512 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
513 DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
516 LARGE_INTEGER offset;
519 offset.u.LowPart = offset_low;
520 offset.u.HighPart = offset_high;
522 if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
523 else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
524 else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
525 else protect = PAGE_NOACCESS;
527 if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
528 &count, ViewShare, 0, protect )))
530 SetLastError( RtlNtStatusToDosError(status) );
537 /***********************************************************************
538 * UnmapViewOfFile (KERNEL32.@)
540 * Unmaps a mapped view of a file.
543 * addr [I] Address where mapped view begins.
550 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
552 NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
553 if (status) SetLastError( RtlNtStatusToDosError(status) );
558 /***********************************************************************
559 * FlushViewOfFile (KERNEL32.@)
561 * Writes to the disk a byte range within a mapped view of a file.
564 * base [I] Start address of byte range to flush.
565 * size [I] Number of bytes in range.
571 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
573 NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
576 if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
577 else SetLastError( RtlNtStatusToDosError(status) );
583 /***********************************************************************
584 * IsBadReadPtr (KERNEL32.@)
586 * Check for read access on a memory block.
588 * ptr [I] Address of memory block.
589 * size [I] Size of block.
593 * Failure: FALSE. Process has read access to entire block.
595 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
597 if (!size) return FALSE; /* handle 0 size case w/o reference */
598 if (!ptr) return TRUE;
600 if (!page_size) page_size = getpagesize();
603 volatile const char *p = ptr;
607 while (count > page_size)
614 dummy = p[count - 1];
618 TRACE_(seh)("%p caused page fault during read\n", ptr);
626 /***********************************************************************
627 * IsBadWritePtr (KERNEL32.@)
629 * Check for write access on a memory block.
632 * ptr [I] Address of memory block.
633 * size [I] Size of block in bytes.
637 * Failure: FALSE. Process has write access to entire block.
639 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
641 if (!size) return FALSE; /* handle 0 size case w/o reference */
642 if (!ptr) return TRUE;
644 if (!page_size) page_size = getpagesize();
647 volatile char *p = ptr;
650 while (count > page_size)
661 TRACE_(seh)("%p caused page fault during write\n", ptr);
669 /***********************************************************************
670 * IsBadHugeReadPtr (KERNEL32.@)
672 * Check for read access on a memory block.
675 * ptr [I] Address of memory block.
676 * size [I] Size of block.
680 * Failure: FALSE. Process has read access to entire block.
682 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
684 return IsBadReadPtr( ptr, size );
688 /***********************************************************************
689 * IsBadHugeWritePtr (KERNEL32.@)
691 * Check for write access on a memory block.
694 * ptr [I] Address of memory block.
695 * size [I] Size of block.
699 * Failure: FALSE. Process has write access to entire block.
701 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
703 return IsBadWritePtr( ptr, size );
707 /***********************************************************************
708 * IsBadCodePtr (KERNEL32.@)
710 * Check for read access on a memory address.
713 * ptr [I] Address of function.
717 * Failure: FALSE. Process has read access to specified memory.
719 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
721 return IsBadReadPtr( ptr, 1 );
725 /***********************************************************************
726 * IsBadStringPtrA (KERNEL32.@)
728 * Check for read access on a range of memory pointed to by a string pointer.
731 * str [I] Address of string.
732 * max [I] Maximum size of string.
736 * Failure: FALSE. Read access to all bytes in string.
738 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
740 if (!str) return TRUE;
744 volatile const char *p = str;
745 while (p != str + max) if (!*p++) break;
749 TRACE_(seh)("%p caused page fault during read\n", str);
757 /***********************************************************************
758 * IsBadStringPtrW (KERNEL32.@)
760 * See IsBadStringPtrA.
762 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
764 if (!str) return TRUE;
768 volatile const WCHAR *p = str;
769 while (p != str + max) if (!*p++) break;
773 TRACE_(seh)("%p caused page fault during read\n", str);