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 void mapping_destroy( struct object *obj );
58 static const struct object_ops mapping_ops =
60 sizeof(struct mapping), /* size */
61 mapping_dump, /* dump */
62 no_add_queue, /* add_queue */
63 NULL, /* remove_queue */
66 no_signal, /* signal */
67 mapping_get_fd, /* get_fd */
68 no_map_access, /* map_access */
69 no_lookup_name, /* lookup_name */
70 no_close_handle, /* close_handle */
71 mapping_destroy /* destroy */
74 static struct list shared_list = LIST_INIT(shared_list);
78 /* These are always the same on an i386, and it will be faster this way */
79 # define page_mask 0xfff
80 # define page_shift 12
81 # define init_page_size() do { /* nothing */ } while(0)
85 static int page_shift, page_mask;
87 static void init_page_size(void)
90 # ifdef HAVE_GETPAGESIZE
91 page_size = getpagesize();
94 page_size = sysconf(_SC_PAGESIZE);
96 # error Cannot get the page size on this platform
99 page_mask = page_size - 1;
100 /* Make sure we have a power of 2 */
101 assert( !(page_size & page_mask) );
103 while ((1 << page_shift) != page_size) page_shift++;
105 #endif /* __i386__ */
107 #define ROUND_SIZE_MASK(addr,size,mask) \
108 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
110 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
113 /* find the shared PE mapping for a given mapping */
114 static struct file *get_shared_file( struct mapping *mapping )
118 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
119 if (is_same_file( ptr->file, mapping->file ))
120 return (struct file *)grab_object( ptr->shared_file );
124 /* return the size of the memory mapping of a given section */
125 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
127 if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
128 else return ROUND_SIZE( sec->Misc.VirtualSize );
131 /* return the size of the file mapping of a given section */
132 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
134 if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
135 else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
138 /* allocate and fill the temp file for a shared PE image mapping */
139 static int build_shared_mapping( struct mapping *mapping, int fd,
140 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
142 unsigned int i, size, max_size, total_size;
143 off_t shared_pos, read_pos, write_pos;
148 /* compute the total size of the shared mapping */
150 total_size = max_size = 0;
151 for (i = 0; i < nb_sec; i++)
153 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
154 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
156 size = get_section_filemap_size( &sec[i] );
157 if (size > max_size) max_size = size;
158 total_size += get_section_map_size( &sec[i] );
161 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
163 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
165 /* create a temp file for the mapping */
167 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
168 if (!grow_file( mapping->shared_file, total_size )) goto error;
169 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
171 if (!(buffer = malloc( max_size ))) goto error;
173 /* copy the shared sections data into the temp file */
176 for (i = 0; i < nb_sec; i++)
178 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
179 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
180 write_pos = shared_pos;
181 shared_pos += get_section_map_size( &sec[i] );
182 read_pos = sec[i].PointerToRawData;
183 size = get_section_filemap_size( &sec[i] );
184 if (!read_pos || !size) continue;
188 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
189 if (res <= 0) goto error;
193 if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
199 release_object( mapping->shared_file );
200 mapping->shared_file = NULL;
201 if (buffer) free( buffer );
205 /* retrieve the mapping parameters for an executable (PE) image */
206 static int get_image_params( struct mapping *mapping )
208 IMAGE_DOS_HEADER dos;
210 IMAGE_SECTION_HEADER *sec = NULL;
213 int unix_fd, size, toread;
215 /* load the headers */
217 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
218 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
219 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
220 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
223 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
225 pos += sizeof(nt.Signature);
226 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
227 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
229 pos += sizeof(nt.FileHeader);
230 /* zero out Optional header in the case it's not present or partial */
231 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
232 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
233 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
234 pos += nt.FileHeader.SizeOfOptionalHeader;
236 /* load the section headers */
238 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
239 if (!(sec = malloc( size ))) goto error;
240 if (pread( unix_fd, sec, size, pos ) != size) goto error;
242 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
244 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
246 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
247 mapping->base = (void *)nt.OptionalHeader.ImageBase;
248 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
249 nt.OptionalHeader.SectionAlignment - 1 );
250 mapping->protect = VPROT_IMAGE;
253 if (mapping->header_size > mapping->size) goto error;
256 release_object( fd );
260 if (sec) free( sec );
261 release_object( fd );
262 set_error( STATUS_INVALID_FILE_FOR_SECTION );
266 /* get the size of the unix file associated with the mapping */
267 inline static int get_file_size( struct file *file, file_pos_t *size )
270 int unix_fd = get_file_unix_fd( file );
272 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
277 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
278 unsigned int attr, file_pos_t size, int protect,
279 obj_handle_t handle )
281 struct mapping *mapping;
284 if (!page_mask) init_page_size();
286 if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
288 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
289 return &mapping->obj; /* Nothing else to do */
291 mapping->header_size = 0;
292 mapping->base = NULL;
293 mapping->shared_file = NULL;
294 mapping->shared_size = 0;
296 if (protect & VPROT_READ) access |= GENERIC_READ;
297 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
301 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
302 if (protect & VPROT_IMAGE)
304 if (!get_image_params( mapping )) goto error;
305 return &mapping->obj;
309 if (!get_file_size( mapping->file, &size )) goto error;
312 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
318 if (!grow_file( mapping->file, size )) goto error;
321 else /* Anonymous mapping (no associated file) */
323 if (!size || (protect & VPROT_IMAGE))
325 set_error( STATUS_INVALID_PARAMETER );
326 mapping->file = NULL;
329 if (!(mapping->file = create_temp_file( access ))) goto error;
330 if (!grow_file( mapping->file, size )) goto error;
332 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
333 mapping->protect = protect;
334 return &mapping->obj;
337 release_object( mapping );
341 static void mapping_dump( struct object *obj, int verbose )
343 struct mapping *mapping = (struct mapping *)obj;
344 assert( obj->ops == &mapping_ops );
345 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
346 "shared_file=%p shared_size=%08x ",
347 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
348 mapping->protect, mapping->file, mapping->header_size,
349 mapping->base, mapping->shared_file, mapping->shared_size );
350 dump_object_name( &mapping->obj );
351 fputc( '\n', stderr );
354 static struct fd *mapping_get_fd( struct object *obj )
356 struct mapping *mapping = (struct mapping *)obj;
357 return get_obj_fd( (struct object *)mapping->file );
360 static void mapping_destroy( struct object *obj )
362 struct mapping *mapping = (struct mapping *)obj;
363 assert( obj->ops == &mapping_ops );
364 if (mapping->file) release_object( mapping->file );
365 if (mapping->shared_file)
367 release_object( mapping->shared_file );
368 list_remove( &mapping->shared_entry );
372 int get_page_size(void)
374 if (!page_mask) init_page_size();
375 return page_mask + 1;
378 /* create a file mapping */
379 DECL_HANDLER(create_mapping)
382 struct unicode_str name;
383 struct directory *root = NULL;
384 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
387 get_req_unicode_str( &name );
388 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
391 if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
393 reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
394 release_object( obj );
397 if (root) release_object( root );
400 /* open a handle to a mapping */
401 DECL_HANDLER(open_mapping)
403 struct unicode_str name;
404 struct directory *root = NULL;
405 struct mapping *mapping;
407 get_req_unicode_str( &name );
408 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
411 if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
413 reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
414 release_object( mapping );
417 if (root) release_object( root );
420 /* get a mapping information */
421 DECL_HANDLER(get_mapping_info)
423 struct mapping *mapping;
425 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
428 reply->size_high = (unsigned int)(mapping->size >> 32);
429 reply->size_low = (unsigned int)mapping->size;
430 reply->protect = mapping->protect;
431 reply->header_size = mapping->header_size;
432 reply->base = mapping->base;
433 reply->shared_file = 0;
434 reply->shared_size = mapping->shared_size;
435 if (mapping->shared_file)
436 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
437 GENERIC_READ|GENERIC_WRITE, 0 );
438 release_object( mapping );