2 * Server-side file mapping management
4 * Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "wine/port.h"
32 #define WIN32_NO_STATUS
43 struct object obj; /* object header */
44 file_pos_t size; /* mapping size */
45 int protect; /* protection flags */
46 struct file *file; /* file mapped */
47 int header_size; /* size of headers (for PE image mapping) */
48 void *base; /* default base addr (for PE image mapping) */
49 struct file *shared_file; /* temp file for shared PE mapping */
50 int shared_size; /* shared mapping total size */
51 struct list shared_entry; /* entry in global shared PE mappings list */
54 static void mapping_dump( struct object *obj, int verbose );
55 static struct fd *mapping_get_fd( struct object *obj );
56 static unsigned int mapping_map_access( struct object *obj, unsigned int access );
57 static void mapping_destroy( struct object *obj );
59 static const struct object_ops mapping_ops =
61 sizeof(struct mapping), /* size */
62 mapping_dump, /* dump */
63 no_add_queue, /* add_queue */
64 NULL, /* remove_queue */
67 no_signal, /* signal */
68 mapping_get_fd, /* get_fd */
69 mapping_map_access, /* map_access */
70 no_lookup_name, /* lookup_name */
71 no_close_handle, /* close_handle */
72 mapping_destroy /* destroy */
75 static struct list shared_list = LIST_INIT(shared_list);
79 /* These are always the same on an i386, and it will be faster this way */
80 # define page_mask 0xfff
81 # define page_shift 12
82 # define init_page_size() do { /* nothing */ } while(0)
86 static int page_shift, page_mask;
88 static void init_page_size(void)
91 # ifdef HAVE_GETPAGESIZE
92 page_size = getpagesize();
95 page_size = sysconf(_SC_PAGESIZE);
97 # error Cannot get the page size on this platform
100 page_mask = page_size - 1;
101 /* Make sure we have a power of 2 */
102 assert( !(page_size & page_mask) );
104 while ((1 << page_shift) != page_size) page_shift++;
106 #endif /* __i386__ */
108 #define ROUND_SIZE_MASK(addr,size,mask) \
109 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
111 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
114 /* find the shared PE mapping for a given mapping */
115 static struct file *get_shared_file( struct mapping *mapping )
119 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
120 if (is_same_file( ptr->file, mapping->file ))
121 return (struct file *)grab_object( ptr->shared_file );
125 /* return the size of the memory mapping of a given section */
126 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
128 if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
129 else return ROUND_SIZE( sec->Misc.VirtualSize );
132 /* return the size of the file mapping of a given section */
133 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
135 if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
136 else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
139 /* allocate and fill the temp file for a shared PE image mapping */
140 static int build_shared_mapping( struct mapping *mapping, int fd,
141 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
143 unsigned int i, size, max_size, total_size;
144 off_t shared_pos, read_pos, write_pos;
149 /* compute the total size of the shared mapping */
151 total_size = max_size = 0;
152 for (i = 0; i < nb_sec; i++)
154 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
155 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
157 size = get_section_filemap_size( &sec[i] );
158 if (size > max_size) max_size = size;
159 total_size += get_section_map_size( &sec[i] );
162 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
164 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
166 /* create a temp file for the mapping */
168 if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
169 if (!grow_file( mapping->shared_file, total_size )) goto error;
170 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
172 if (!(buffer = malloc( max_size ))) goto error;
174 /* copy the shared sections data into the temp file */
177 for (i = 0; i < nb_sec; i++)
179 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
180 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
181 write_pos = shared_pos;
182 shared_pos += get_section_map_size( &sec[i] );
183 read_pos = sec[i].PointerToRawData;
184 size = get_section_filemap_size( &sec[i] );
185 if (!read_pos || !size) continue;
189 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
190 if (res <= 0) goto error;
194 if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
200 release_object( mapping->shared_file );
201 mapping->shared_file = NULL;
202 if (buffer) free( buffer );
206 /* retrieve the mapping parameters for an executable (PE) image */
207 static int get_image_params( struct mapping *mapping )
209 IMAGE_DOS_HEADER dos;
211 IMAGE_SECTION_HEADER *sec = NULL;
214 int unix_fd, size, toread;
216 /* load the headers */
218 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
219 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
220 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
221 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
224 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
226 pos += sizeof(nt.Signature);
227 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
228 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
230 pos += sizeof(nt.FileHeader);
231 /* zero out Optional header in the case it's not present or partial */
232 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
233 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
234 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
235 pos += nt.FileHeader.SizeOfOptionalHeader;
237 /* load the section headers */
239 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
240 if (!(sec = malloc( size ))) goto error;
241 if (pread( unix_fd, sec, size, pos ) != size) goto error;
243 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
245 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
247 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
248 mapping->base = (void *)nt.OptionalHeader.ImageBase;
249 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
250 nt.OptionalHeader.SectionAlignment - 1 );
251 mapping->protect = VPROT_IMAGE;
254 if (mapping->header_size > mapping->size) goto error;
257 release_object( fd );
261 if (sec) free( sec );
262 release_object( fd );
263 set_error( STATUS_INVALID_FILE_FOR_SECTION );
267 /* get the size of the unix file associated with the mapping */
268 inline static int get_file_size( struct file *file, file_pos_t *size )
271 int unix_fd = get_file_unix_fd( file );
273 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
278 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
279 unsigned int attr, file_pos_t size, int protect,
280 obj_handle_t handle )
282 struct mapping *mapping;
285 if (!page_mask) init_page_size();
287 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
289 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
290 return &mapping->obj; /* Nothing else to do */
292 mapping->header_size = 0;
293 mapping->base = NULL;
294 mapping->shared_file = NULL;
295 mapping->shared_size = 0;
297 if (protect & VPROT_READ) access |= FILE_READ_DATA;
298 if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
302 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
303 if (protect & VPROT_IMAGE)
305 if (!get_image_params( mapping )) goto error;
306 return &mapping->obj;
310 if (!get_file_size( mapping->file, &size )) goto error;
313 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
319 if (!grow_file( mapping->file, size )) goto error;
322 else /* Anonymous mapping (no associated file) */
324 if (!size || (protect & VPROT_IMAGE))
326 set_error( STATUS_INVALID_PARAMETER );
327 mapping->file = NULL;
330 if (!(mapping->file = create_temp_file( access ))) goto error;
331 if (!grow_file( mapping->file, size )) goto error;
333 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
334 mapping->protect = protect;
335 return &mapping->obj;
338 release_object( mapping );
342 static void mapping_dump( struct object *obj, int verbose )
344 struct mapping *mapping = (struct mapping *)obj;
345 assert( obj->ops == &mapping_ops );
346 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
347 "shared_file=%p shared_size=%08x ",
348 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
349 mapping->protect, mapping->file, mapping->header_size,
350 mapping->base, mapping->shared_file, mapping->shared_size );
351 dump_object_name( &mapping->obj );
352 fputc( '\n', stderr );
355 static struct fd *mapping_get_fd( struct object *obj )
357 struct mapping *mapping = (struct mapping *)obj;
358 return get_obj_fd( (struct object *)mapping->file );
361 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
363 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
364 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
365 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
366 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
367 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
370 static void mapping_destroy( struct object *obj )
372 struct mapping *mapping = (struct mapping *)obj;
373 assert( obj->ops == &mapping_ops );
374 if (mapping->file) release_object( mapping->file );
375 if (mapping->shared_file)
377 release_object( mapping->shared_file );
378 list_remove( &mapping->shared_entry );
382 int get_page_size(void)
384 if (!page_mask) init_page_size();
385 return page_mask + 1;
388 /* create a file mapping */
389 DECL_HANDLER(create_mapping)
392 struct unicode_str name;
393 struct directory *root = NULL;
394 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
397 get_req_unicode_str( &name );
398 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
401 if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
403 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
404 release_object( obj );
407 if (root) release_object( root );
410 /* open a handle to a mapping */
411 DECL_HANDLER(open_mapping)
413 struct unicode_str name;
414 struct directory *root = NULL;
415 struct mapping *mapping;
417 get_req_unicode_str( &name );
418 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
421 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
423 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
424 release_object( mapping );
427 if (root) release_object( root );
430 /* get a mapping information */
431 DECL_HANDLER(get_mapping_info)
433 struct mapping *mapping;
435 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
438 reply->size_high = (unsigned int)(mapping->size >> 32);
439 reply->size_low = (unsigned int)mapping->size;
440 reply->protect = mapping->protect;
441 reply->header_size = mapping->header_size;
442 reply->base = mapping->base;
443 reply->shared_file = 0;
444 reply->shared_size = mapping->shared_size;
445 if (mapping->shared_file)
446 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
447 GENERIC_READ|GENERIC_WRITE, 0 );
448 release_object( mapping );