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"
43 #include "wine/debug.h"
45 #include "kernel_private.h"
47 WINE_DECLARE_DEBUG_CHANNEL(seh);
49 static unsigned int page_size;
52 /***********************************************************************
53 * VirtualAlloc (KERNEL32.@)
55 * Reserves or commits a region of pages in virtual address space.
58 * addr [I] Address of region to reserve or commit.
59 * size [I] Size of region.
60 * type [I] Type of allocation.
61 * protect [I] Type of access protection.
64 * Success: Base address of allocated region of pages.
67 LPVOID WINAPI VirtualAlloc( LPVOID addr, SIZE_T size, DWORD type, DWORD protect )
69 return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
73 /***********************************************************************
74 * VirtualAllocEx (KERNEL32.@)
76 * Seems to be just as VirtualAlloc, but with process handle.
79 * hProcess [I] Handle to process to do mem operation.
80 * addr [I] Address of region to reserve or commit.
81 * size [I] Size of region.
82 * type [I] Type of allocation.
83 * protect [I] Type of access protection.
87 * Success: Base address of allocated region of pages.
90 LPVOID WINAPI VirtualAllocEx( HANDLE hProcess, LPVOID addr, SIZE_T size,
91 DWORD type, DWORD protect )
96 if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
98 SetLastError( RtlNtStatusToDosError(status) );
105 /***********************************************************************
106 * VirtualFree (KERNEL32.@)
108 * Releases or decommits a region of pages in virtual address space.
111 * addr [I] Address of region of committed pages.
112 * size [I] Size of region.
113 * type [I] Type of operation.
119 BOOL WINAPI VirtualFree( LPVOID addr, SIZE_T size, DWORD type )
121 return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
125 /***********************************************************************
126 * VirtualFreeEx (KERNEL32.@)
128 * Releases or decommits a region of pages in virtual address space.
131 * process [I] Handle to process.
132 * addr [I] Address of region to free.
133 * size [I] Size of region.
134 * type [I] Type of operation.
140 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
142 NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
143 if (status) SetLastError( RtlNtStatusToDosError(status) );
148 /***********************************************************************
149 * VirtualLock (KERNEL32.@)
151 * Locks the specified region of virtual address space.
154 * addr [I] Address of first byte of range to lock.
155 * size [I] Number of bytes in range to lock.
162 * Always returns TRUE.
165 BOOL WINAPI VirtualLock( LPVOID addr, SIZE_T size )
167 NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
168 if (status) SetLastError( RtlNtStatusToDosError(status) );
173 /***********************************************************************
174 * VirtualUnlock (KERNEL32.@)
176 * Unlocks a range of pages in the virtual address space.
179 * addr [I] Address of first byte of range.
180 * size [I] Number of bytes in range.
187 * Always returns TRUE.
190 BOOL WINAPI VirtualUnlock( LPVOID addr, SIZE_T size )
192 NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
193 if (status) SetLastError( RtlNtStatusToDosError(status) );
198 /***********************************************************************
199 * VirtualProtect (KERNEL32.@)
201 * Changes the access protection on a region of committed pages.
204 * addr [I] Address of region of committed pages.
205 * size [I] Size of region.
206 * new_prot [I] Desired access protection.
207 * old_prot [O] Address of variable to get old protection.
213 BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD old_prot)
215 return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
219 /***********************************************************************
220 * VirtualProtectEx (KERNEL32.@)
222 * Changes the access protection on a region of committed pages in the
223 * virtual address space of a specified process.
226 * process [I] Handle of process.
227 * addr [I] Address of region of committed pages.
228 * size [I] Size of region.
229 * new_prot [I] Desired access protection.
230 * old_prot [O] Address of variable to get old protection.
236 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
237 DWORD new_prot, LPDWORD old_prot )
239 NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
240 if (status) SetLastError( RtlNtStatusToDosError(status) );
245 /***********************************************************************
246 * VirtualQuery (KERNEL32.@)
248 * Provides info about a range of pages in virtual address space.
251 * addr [I] Address of region.
252 * info [O] Address of info buffer.
253 * len [I] Size of buffer.
256 * Number of bytes returned in information buffer or 0 if
257 * addr >= 0xc0000000 (kernel space).
259 SIZE_T WINAPI VirtualQuery( LPCVOID addr, PMEMORY_BASIC_INFORMATION info,
262 return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
266 /***********************************************************************
267 * VirtualQueryEx (KERNEL32.@)
269 * Provides info about a range of pages in virtual address space of a
273 * process [I] Handle to process.
274 * addr [I] Address of region.
275 * info [O] Address of info buffer.
276 * len [I] Size of buffer.
279 * Number of bytes returned in information buffer.
281 SIZE_T WINAPI VirtualQueryEx( HANDLE process, LPCVOID addr,
282 PMEMORY_BASIC_INFORMATION info, SIZE_T len )
287 if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
289 SetLastError( RtlNtStatusToDosError(status) );
296 /***********************************************************************
297 * CreateFileMappingA (KERNEL32.@)
299 * Creates a named or unnamed file-mapping object for the specified file.
302 * hFile [I] Handle to the file to map.
303 * sa [I] Optional security attributes.
304 * protect [I] Protection for mapping object.
305 * size_high [I] High-order 32 bits of object size.
306 * size_low [I] Low-order 32 bits of object size.
307 * name [I] Name of file-mapping object.
311 * Failure: NULL. Mapping object does not exist.
313 HANDLE WINAPI CreateFileMappingA( HANDLE hFile, SECURITY_ATTRIBUTES *sa,
314 DWORD protect, DWORD size_high, DWORD size_low, LPCSTR name )
316 WCHAR buffer[MAX_PATH];
318 if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
320 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
322 SetLastError( ERROR_FILENAME_EXCED_RANGE );
325 return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
329 /***********************************************************************
330 * CreateFileMappingW (KERNEL32.@)
332 * See CreateFileMappingA.
334 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
335 DWORD protect, DWORD size_high,
336 DWORD size_low, LPCWSTR name )
338 static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
341 OBJECT_ATTRIBUTES attr;
342 UNICODE_STRING nameW;
344 DWORD access, sec_type;
347 attr.Length = sizeof(attr);
348 attr.RootDirectory = 0;
349 attr.ObjectName = NULL;
350 attr.Attributes = OBJ_OPENIF | ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
351 attr.SecurityDescriptor = sa ? sa->lpSecurityDescriptor : NULL;
352 attr.SecurityQualityOfService = NULL;
356 RtlInitUnicodeString( &nameW, name );
357 attr.ObjectName = &nameW;
358 attr.RootDirectory = get_BaseNamedObjects_handle();
361 sec_type = protect & sec_flags;
362 protect &= ~sec_flags;
363 if (!sec_type) sec_type = SEC_COMMIT;
368 protect = PAGE_READONLY; /* Win9x compatibility */
372 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ;
375 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE;
378 SetLastError( ERROR_INVALID_PARAMETER );
382 if (hFile == INVALID_HANDLE_VALUE)
385 if (!size_low && !size_high)
387 SetLastError( ERROR_INVALID_PARAMETER );
392 size.u.LowPart = size_low;
393 size.u.HighPart = size_high;
395 status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
396 if (status == STATUS_OBJECT_NAME_EXISTS)
397 SetLastError( ERROR_ALREADY_EXISTS );
399 SetLastError( RtlNtStatusToDosError(status) );
404 /***********************************************************************
405 * OpenFileMappingA (KERNEL32.@)
407 * Opens a named file-mapping object.
410 * access [I] Access mode.
411 * inherit [I] Inherit flag.
412 * name [I] Name of file-mapping object.
418 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
420 WCHAR buffer[MAX_PATH];
422 if (!name) return OpenFileMappingW( access, inherit, NULL );
424 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
426 SetLastError( ERROR_FILENAME_EXCED_RANGE );
429 return OpenFileMappingW( access, inherit, buffer );
433 /***********************************************************************
434 * OpenFileMappingW (KERNEL32.@)
436 * See OpenFileMappingA.
438 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
440 OBJECT_ATTRIBUTES attr;
441 UNICODE_STRING nameW;
447 SetLastError( ERROR_INVALID_PARAMETER );
450 attr.Length = sizeof(attr);
451 attr.RootDirectory = get_BaseNamedObjects_handle();
452 attr.ObjectName = &nameW;
453 attr.Attributes = inherit ? OBJ_INHERIT : 0;
454 attr.SecurityDescriptor = NULL;
455 attr.SecurityQualityOfService = NULL;
456 RtlInitUnicodeString( &nameW, name );
458 if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
460 if ((status = NtOpenSection( &ret, access, &attr )))
462 SetLastError( RtlNtStatusToDosError(status) );
469 /***********************************************************************
470 * MapViewOfFile (KERNEL32.@)
472 * Maps a view of a file into the address space.
475 * mapping [I] File-mapping object to map.
476 * access [I] Access mode.
477 * offset_high [I] High-order 32 bits of file offset.
478 * offset_low [I] Low-order 32 bits of file offset.
479 * count [I] Number of bytes to map.
482 * Success: Starting address of mapped view.
485 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
486 DWORD offset_high, DWORD offset_low, SIZE_T count )
488 return MapViewOfFileEx( mapping, access, offset_high,
489 offset_low, count, NULL );
493 /***********************************************************************
494 * MapViewOfFileEx (KERNEL32.@)
496 * Maps a view of a file into the address space.
499 * handle [I] File-mapping object to map.
500 * access [I] Access mode.
501 * offset_high [I] High-order 32 bits of file offset.
502 * offset_low [I] Low-order 32 bits of file offset.
503 * count [I] Number of bytes to map.
504 * addr [I] Suggested starting address for mapped view.
507 * Success: Starting address of mapped view.
510 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
511 DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
514 LARGE_INTEGER offset;
517 offset.u.LowPart = offset_low;
518 offset.u.HighPart = offset_high;
520 if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
521 else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
522 else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
523 else protect = PAGE_NOACCESS;
525 if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
526 &count, ViewShare, 0, protect )))
528 SetLastError( RtlNtStatusToDosError(status) );
535 /***********************************************************************
536 * UnmapViewOfFile (KERNEL32.@)
538 * Unmaps a mapped view of a file.
541 * addr [I] Address where mapped view begins.
548 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
550 NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
551 if (status) SetLastError( RtlNtStatusToDosError(status) );
556 /***********************************************************************
557 * FlushViewOfFile (KERNEL32.@)
559 * Writes to the disk a byte range within a mapped view of a file.
562 * base [I] Start address of byte range to flush.
563 * size [I] Number of bytes in range.
569 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
571 NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
574 if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
575 else SetLastError( RtlNtStatusToDosError(status) );
581 /***********************************************************************
582 * IsBadReadPtr (KERNEL32.@)
584 * Check for read access on a memory block.
586 * ptr [I] Address of memory block.
587 * size [I] Size of block.
591 * Failure: FALSE. Process has read access to entire block.
593 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
595 if (!size) return FALSE; /* handle 0 size case w/o reference */
596 if (!ptr) return TRUE;
598 if (!page_size) page_size = getpagesize();
601 volatile const char *p = ptr;
605 while (count > page_size)
612 dummy = p[count - 1];
616 TRACE_(seh)("%p caused page fault during read\n", ptr);
624 /***********************************************************************
625 * IsBadWritePtr (KERNEL32.@)
627 * Check for write access on a memory block.
630 * ptr [I] Address of memory block.
631 * size [I] Size of block in bytes.
635 * Failure: FALSE. Process has write access to entire block.
637 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
639 if (!size) return FALSE; /* handle 0 size case w/o reference */
640 if (!ptr) return TRUE;
642 if (!page_size) page_size = getpagesize();
645 volatile char *p = ptr;
648 while (count > page_size)
659 TRACE_(seh)("%p caused page fault during write\n", ptr);
667 /***********************************************************************
668 * IsBadHugeReadPtr (KERNEL32.@)
670 * Check for read access on a memory block.
673 * ptr [I] Address of memory block.
674 * size [I] Size of block.
678 * Failure: FALSE. Process has read access to entire block.
680 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
682 return IsBadReadPtr( ptr, size );
686 /***********************************************************************
687 * IsBadHugeWritePtr (KERNEL32.@)
689 * Check for write access on a memory block.
692 * ptr [I] Address of memory block.
693 * size [I] Size of block.
697 * Failure: FALSE. Process has write access to entire block.
699 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
701 return IsBadWritePtr( ptr, size );
705 /***********************************************************************
706 * IsBadCodePtr (KERNEL32.@)
708 * Check for read access on a memory address.
711 * ptr [I] Address of function.
715 * Failure: FALSE. Process has read access to specified memory.
717 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
719 return IsBadReadPtr( ptr, 1 );
723 /***********************************************************************
724 * IsBadStringPtrA (KERNEL32.@)
726 * Check for read access on a range of memory pointed to by a string pointer.
729 * str [I] Address of string.
730 * max [I] Maximum size of string.
734 * Failure: FALSE. Read access to all bytes in string.
736 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
738 if (!str) return TRUE;
742 volatile const char *p = str;
743 while (p != str + max) if (!*p++) break;
747 TRACE_(seh)("%p caused page fault during read\n", str);
755 /***********************************************************************
756 * IsBadStringPtrW (KERNEL32.@)
758 * See IsBadStringPtrA.
760 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
762 if (!str) return TRUE;
766 volatile const WCHAR *p = str;
767 while (p != str + max) if (!*p++) break;
771 TRACE_(seh)("%p caused page fault during read\n", str);