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 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_EXECUTE;
380 case PAGE_EXECUTE_READ:
381 case PAGE_EXECUTE_WRITECOPY:
382 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE;
384 case PAGE_EXECUTE_READWRITE:
385 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE;
388 SetLastError( ERROR_INVALID_PARAMETER );
392 if (hFile == INVALID_HANDLE_VALUE)
395 if (!size_low && !size_high)
397 SetLastError( ERROR_INVALID_PARAMETER );
402 size.u.LowPart = size_low;
403 size.u.HighPart = size_high;
405 status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
406 if (status == STATUS_OBJECT_NAME_EXISTS)
407 SetLastError( ERROR_ALREADY_EXISTS );
409 SetLastError( RtlNtStatusToDosError(status) );
414 /***********************************************************************
415 * OpenFileMappingA (KERNEL32.@)
417 * Opens a named file-mapping object.
420 * access [I] Access mode.
421 * inherit [I] Inherit flag.
422 * name [I] Name of file-mapping object.
428 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
430 WCHAR buffer[MAX_PATH];
432 if (!name) return OpenFileMappingW( access, inherit, NULL );
434 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
436 SetLastError( ERROR_FILENAME_EXCED_RANGE );
439 return OpenFileMappingW( access, inherit, buffer );
443 /***********************************************************************
444 * OpenFileMappingW (KERNEL32.@)
446 * See OpenFileMappingA.
448 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
450 OBJECT_ATTRIBUTES attr;
451 UNICODE_STRING nameW;
457 SetLastError( ERROR_INVALID_PARAMETER );
460 attr.Length = sizeof(attr);
461 attr.RootDirectory = get_BaseNamedObjects_handle();
462 attr.ObjectName = &nameW;
463 attr.Attributes = inherit ? OBJ_INHERIT : 0;
464 attr.SecurityDescriptor = NULL;
465 attr.SecurityQualityOfService = NULL;
466 RtlInitUnicodeString( &nameW, name );
468 if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
470 if ((status = NtOpenSection( &ret, access, &attr )))
472 SetLastError( RtlNtStatusToDosError(status) );
479 /***********************************************************************
480 * MapViewOfFile (KERNEL32.@)
482 * Maps a view of a file into the address space.
485 * mapping [I] File-mapping object to map.
486 * access [I] Access mode.
487 * offset_high [I] High-order 32 bits of file offset.
488 * offset_low [I] Low-order 32 bits of file offset.
489 * count [I] Number of bytes to map.
492 * Success: Starting address of mapped view.
495 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
496 DWORD offset_high, DWORD offset_low, SIZE_T count )
498 return MapViewOfFileEx( mapping, access, offset_high,
499 offset_low, count, NULL );
503 /***********************************************************************
504 * MapViewOfFileEx (KERNEL32.@)
506 * Maps a view of a file into the address space.
509 * handle [I] File-mapping object to map.
510 * access [I] Access mode.
511 * offset_high [I] High-order 32 bits of file offset.
512 * offset_low [I] Low-order 32 bits of file offset.
513 * count [I] Number of bytes to map.
514 * addr [I] Suggested starting address for mapped view.
517 * Success: Starting address of mapped view.
520 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
521 DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
524 LARGE_INTEGER offset;
527 offset.u.LowPart = offset_low;
528 offset.u.HighPart = offset_high;
530 if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
531 else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
532 else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
533 else protect = PAGE_NOACCESS;
535 if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
536 &count, ViewShare, 0, protect )))
538 SetLastError( RtlNtStatusToDosError(status) );
545 /***********************************************************************
546 * UnmapViewOfFile (KERNEL32.@)
548 * Unmaps a mapped view of a file.
551 * addr [I] Address where mapped view begins.
558 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
560 NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
561 if (status) SetLastError( RtlNtStatusToDosError(status) );
566 /***********************************************************************
567 * FlushViewOfFile (KERNEL32.@)
569 * Writes to the disk a byte range within a mapped view of a file.
572 * base [I] Start address of byte range to flush.
573 * size [I] Number of bytes in range.
579 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
581 NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
584 if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
585 else SetLastError( RtlNtStatusToDosError(status) );
591 /***********************************************************************
592 * IsBadReadPtr (KERNEL32.@)
594 * Check for read access on a memory block.
596 * ptr [I] Address of memory block.
597 * size [I] Size of block.
601 * Failure: FALSE. Process has read access to entire block.
603 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
605 if (!size) return FALSE; /* handle 0 size case w/o reference */
606 if (!ptr) return TRUE;
608 if (!page_size) page_size = getpagesize();
611 volatile const char *p = ptr;
615 while (count > page_size)
622 dummy = p[count - 1];
626 TRACE_(seh)("%p caused page fault during read\n", ptr);
634 /***********************************************************************
635 * IsBadWritePtr (KERNEL32.@)
637 * Check for write access on a memory block.
640 * ptr [I] Address of memory block.
641 * size [I] Size of block in bytes.
645 * Failure: FALSE. Process has write access to entire block.
647 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
649 if (!size) return FALSE; /* handle 0 size case w/o reference */
650 if (!ptr) return TRUE;
652 if (!page_size) page_size = getpagesize();
655 volatile char *p = ptr;
658 while (count > page_size)
669 TRACE_(seh)("%p caused page fault during write\n", ptr);
677 /***********************************************************************
678 * IsBadHugeReadPtr (KERNEL32.@)
680 * Check for read access on a memory block.
683 * ptr [I] Address of memory block.
684 * size [I] Size of block.
688 * Failure: FALSE. Process has read access to entire block.
690 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
692 return IsBadReadPtr( ptr, size );
696 /***********************************************************************
697 * IsBadHugeWritePtr (KERNEL32.@)
699 * Check for write access on a memory block.
702 * ptr [I] Address of memory block.
703 * size [I] Size of block.
707 * Failure: FALSE. Process has write access to entire block.
709 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
711 return IsBadWritePtr( ptr, size );
715 /***********************************************************************
716 * IsBadCodePtr (KERNEL32.@)
718 * Check for read access on a memory address.
721 * ptr [I] Address of function.
725 * Failure: FALSE. Process has read access to specified memory.
727 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
729 return IsBadReadPtr( ptr, 1 );
733 /***********************************************************************
734 * IsBadStringPtrA (KERNEL32.@)
736 * Check for read access on a range of memory pointed to by a string pointer.
739 * str [I] Address of string.
740 * max [I] Maximum size of string.
744 * Failure: FALSE. Read access to all bytes in string.
746 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
748 if (!str) return TRUE;
752 volatile const char *p = str;
753 while (p != str + max) if (!*p++) break;
757 TRACE_(seh)("%p caused page fault during read\n", str);
765 /***********************************************************************
766 * IsBadStringPtrW (KERNEL32.@)
768 * See IsBadStringPtrA.
770 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
772 if (!str) return TRUE;
776 volatile const WCHAR *p = str;
777 while (p != str + max) if (!*p++) break;
781 TRACE_(seh)("%p caused page fault during read\n", str);