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_lookup_name, /* lookup_name */
69 no_close_handle, /* close_handle */
70 mapping_destroy /* destroy */
73 static struct list shared_list = LIST_INIT(shared_list);
77 /* These are always the same on an i386, and it will be faster this way */
78 # define page_mask 0xfff
79 # define page_shift 12
80 # define init_page_size() do { /* nothing */ } while(0)
84 static int page_shift, page_mask;
86 static void init_page_size(void)
89 # ifdef HAVE_GETPAGESIZE
90 page_size = getpagesize();
93 page_size = sysconf(_SC_PAGESIZE);
95 # error Cannot get the page size on this platform
98 page_mask = page_size - 1;
99 /* Make sure we have a power of 2 */
100 assert( !(page_size & page_mask) );
102 while ((1 << page_shift) != page_size) page_shift++;
104 #endif /* __i386__ */
106 #define ROUND_SIZE_MASK(addr,size,mask) \
107 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
109 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
112 /* find the shared PE mapping for a given mapping */
113 static struct file *get_shared_file( struct mapping *mapping )
117 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
118 if (is_same_file( ptr->file, mapping->file ))
119 return (struct file *)grab_object( ptr->shared_file );
123 /* return the size of the memory mapping of a given section */
124 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
126 if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
127 else return ROUND_SIZE( sec->Misc.VirtualSize );
130 /* return the size of the file mapping of a given section */
131 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
133 if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
134 else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
137 /* allocate and fill the temp file for a shared PE image mapping */
138 static int build_shared_mapping( struct mapping *mapping, int fd,
139 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
141 unsigned int i, size, max_size, total_size;
142 off_t shared_pos, read_pos, write_pos;
147 /* compute the total size of the shared mapping */
149 total_size = max_size = 0;
150 for (i = 0; i < nb_sec; i++)
152 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
153 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
155 size = get_section_filemap_size( &sec[i] );
156 if (size > max_size) max_size = size;
157 total_size += get_section_map_size( &sec[i] );
160 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
162 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
164 /* create a temp file for the mapping */
166 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
167 if (!grow_file( mapping->shared_file, total_size )) goto error;
168 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
170 if (!(buffer = malloc( max_size ))) goto error;
172 /* copy the shared sections data into the temp file */
175 for (i = 0; i < nb_sec; i++)
177 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
178 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
179 write_pos = shared_pos;
180 shared_pos += get_section_map_size( &sec[i] );
181 read_pos = sec[i].PointerToRawData;
182 size = get_section_filemap_size( &sec[i] );
183 if (!read_pos || !size) continue;
187 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
188 if (res <= 0) goto error;
192 if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
198 release_object( mapping->shared_file );
199 mapping->shared_file = NULL;
200 if (buffer) free( buffer );
204 /* retrieve the mapping parameters for an executable (PE) image */
205 static int get_image_params( struct mapping *mapping )
207 IMAGE_DOS_HEADER dos;
209 IMAGE_SECTION_HEADER *sec = NULL;
212 int unix_fd, size, toread;
214 /* load the headers */
216 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
217 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
218 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
219 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
222 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
224 pos += sizeof(nt.Signature);
225 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
226 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
228 pos += sizeof(nt.FileHeader);
229 /* zero out Optional header in the case it's not present or partial */
230 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
231 toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
232 if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
233 pos += nt.FileHeader.SizeOfOptionalHeader;
235 /* load the section headers */
237 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
238 if (!(sec = malloc( size ))) goto error;
239 if (pread( unix_fd, sec, size, pos ) != size) goto error;
241 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
243 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
245 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
246 mapping->base = (void *)nt.OptionalHeader.ImageBase;
247 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
248 nt.OptionalHeader.SectionAlignment - 1 );
249 mapping->protect = VPROT_IMAGE;
252 if (mapping->header_size > mapping->size) goto error;
255 release_object( fd );
259 if (sec) free( sec );
260 release_object( fd );
261 set_error( STATUS_INVALID_FILE_FOR_SECTION );
265 /* get the size of the unix file associated with the mapping */
266 inline static int get_file_size( struct file *file, file_pos_t *size )
269 int unix_fd = get_file_unix_fd( file );
271 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
276 static struct object *create_mapping( const struct unicode_str *name, unsigned int attr,
277 file_pos_t size, int protect, obj_handle_t handle )
279 struct mapping *mapping;
282 if (!page_mask) init_page_size();
284 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, attr )))
286 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
287 return &mapping->obj; /* Nothing else to do */
289 mapping->header_size = 0;
290 mapping->base = NULL;
291 mapping->shared_file = NULL;
292 mapping->shared_size = 0;
294 if (protect & VPROT_READ) access |= GENERIC_READ;
295 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
299 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
300 if (protect & VPROT_IMAGE)
302 if (!get_image_params( mapping )) goto error;
303 return &mapping->obj;
307 if (!get_file_size( mapping->file, &size )) goto error;
310 set_error( STATUS_FILE_INVALID );
316 if (!grow_file( mapping->file, size )) goto error;
319 else /* Anonymous mapping (no associated file) */
321 if (!size || (protect & VPROT_IMAGE))
323 set_error( STATUS_INVALID_PARAMETER );
324 mapping->file = NULL;
327 if (!(mapping->file = create_temp_file( access ))) goto error;
328 if (!grow_file( mapping->file, size )) goto error;
330 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
331 mapping->protect = protect;
332 return &mapping->obj;
335 release_object( mapping );
339 static void mapping_dump( struct object *obj, int verbose )
341 struct mapping *mapping = (struct mapping *)obj;
342 assert( obj->ops == &mapping_ops );
343 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
344 "shared_file=%p shared_size=%08x ",
345 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
346 mapping->protect, mapping->file, mapping->header_size,
347 mapping->base, mapping->shared_file, mapping->shared_size );
348 dump_object_name( &mapping->obj );
349 fputc( '\n', stderr );
352 static struct fd *mapping_get_fd( struct object *obj )
354 struct mapping *mapping = (struct mapping *)obj;
355 return get_obj_fd( (struct object *)mapping->file );
358 static void mapping_destroy( struct object *obj )
360 struct mapping *mapping = (struct mapping *)obj;
361 assert( obj->ops == &mapping_ops );
362 if (mapping->file) release_object( mapping->file );
363 if (mapping->shared_file)
365 release_object( mapping->shared_file );
366 list_remove( &mapping->shared_entry );
370 int get_page_size(void)
372 if (!page_mask) init_page_size();
373 return page_mask + 1;
376 /* create a file mapping */
377 DECL_HANDLER(create_mapping)
380 struct unicode_str name;
381 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
384 get_req_unicode_str( &name );
385 if ((obj = create_mapping( &name, req->attributes, size, req->protect, req->file_handle )))
387 reply->handle = alloc_handle( current->process, obj, req->access,
388 req->attributes & OBJ_INHERIT );
389 release_object( obj );
393 /* open a handle to a mapping */
394 DECL_HANDLER(open_mapping)
396 struct unicode_str name;
398 get_req_unicode_str( &name );
399 reply->handle = open_object( sync_namespace, &name, &mapping_ops, req->access, req->attributes );
402 /* get a mapping information */
403 DECL_HANDLER(get_mapping_info)
405 struct mapping *mapping;
407 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
410 reply->size_high = (unsigned int)(mapping->size >> 32);
411 reply->size_low = (unsigned int)mapping->size;
412 reply->protect = mapping->protect;
413 reply->header_size = mapping->header_size;
414 reply->base = mapping->base;
415 reply->shared_file = 0;
416 reply->shared_size = mapping->shared_size;
417 if (mapping->shared_file)
418 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
419 GENERIC_READ|GENERIC_WRITE, 0 );
420 release_object( mapping );