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"
41 struct object obj; /* object header */
42 file_pos_t size; /* mapping size */
43 int protect; /* protection flags */
44 struct file *file; /* file mapped */
45 int header_size; /* size of headers (for PE image mapping) */
46 void *base; /* default base addr (for PE image mapping) */
47 struct file *shared_file; /* temp file for shared PE mapping */
48 int shared_size; /* shared mapping total size */
49 struct list shared_entry; /* entry in global shared PE mappings list */
52 static void mapping_dump( struct object *obj, int verbose );
53 static struct fd *mapping_get_fd( struct object *obj );
54 static void mapping_destroy( struct object *obj );
56 static const struct object_ops mapping_ops =
58 sizeof(struct mapping), /* size */
59 mapping_dump, /* dump */
60 no_add_queue, /* add_queue */
61 NULL, /* remove_queue */
64 no_signal, /* signal */
65 mapping_get_fd, /* get_fd */
66 no_close_handle, /* close_handle */
67 mapping_destroy /* destroy */
70 static struct list shared_list = LIST_INIT(shared_list);
74 /* These are always the same on an i386, and it will be faster this way */
75 # define page_mask 0xfff
76 # define page_shift 12
77 # define init_page_size() do { /* nothing */ } while(0)
81 static int page_shift, page_mask;
83 static void init_page_size(void)
86 # ifdef HAVE_GETPAGESIZE
87 page_size = getpagesize();
90 page_size = sysconf(_SC_PAGESIZE);
92 # error Cannot get the page size on this platform
95 page_mask = page_size - 1;
96 /* Make sure we have a power of 2 */
97 assert( !(page_size & page_mask) );
99 while ((1 << page_shift) != page_size) page_shift++;
101 #endif /* __i386__ */
103 #define ROUND_SIZE_MASK(addr,size,mask) \
104 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
106 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
109 /* find the shared PE mapping for a given mapping */
110 static struct file *get_shared_file( struct mapping *mapping )
114 LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
115 if (is_same_file( ptr->file, mapping->file ))
116 return (struct file *)grab_object( ptr->shared_file );
120 /* return the size of the memory mapping of a given section */
121 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
123 if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
124 else return ROUND_SIZE( sec->Misc.VirtualSize );
127 /* return the size of the file mapping of a given section */
128 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
130 if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
131 else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
134 /* allocate and fill the temp file for a shared PE image mapping */
135 static int build_shared_mapping( struct mapping *mapping, int fd,
136 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
138 unsigned int i, size, max_size, total_size;
139 off_t shared_pos, read_pos, write_pos;
144 /* compute the total size of the shared mapping */
146 total_size = max_size = 0;
147 for (i = 0; i < nb_sec; i++)
149 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
150 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
152 size = get_section_filemap_size( &sec[i] );
153 if (size > max_size) max_size = size;
154 total_size += get_section_map_size( &sec[i] );
157 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
159 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
161 /* create a temp file for the mapping */
163 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
164 if (!grow_file( mapping->shared_file, total_size )) goto error;
165 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
167 if (!(buffer = malloc( max_size ))) goto error;
169 /* copy the shared sections data into the temp file */
172 for (i = 0; i < nb_sec; i++)
174 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
175 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
176 write_pos = shared_pos;
177 shared_pos += get_section_map_size( &sec[i] );
178 read_pos = sec[i].PointerToRawData;
179 size = get_section_filemap_size( &sec[i] );
180 if (!read_pos || !size) continue;
184 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
185 if (res <= 0) goto error;
189 if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
195 release_object( mapping->shared_file );
196 mapping->shared_file = NULL;
197 if (buffer) free( buffer );
201 /* retrieve the mapping parameters for an executable (PE) image */
202 static int get_image_params( struct mapping *mapping )
204 IMAGE_DOS_HEADER dos;
206 IMAGE_SECTION_HEADER *sec = NULL;
211 /* load the headers */
213 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
214 if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
215 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
216 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
219 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
221 pos += sizeof(nt.Signature);
222 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
223 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
225 pos += sizeof(nt.FileHeader);
226 /* zero out Optional header in the case it's not present or partial */
227 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
228 if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
229 pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
230 pos += nt.FileHeader.SizeOfOptionalHeader;
232 /* load the section headers */
234 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
235 if (!(sec = malloc( size ))) goto error;
236 if (pread( unix_fd, sec, size, pos ) != size) goto error;
238 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
240 if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
242 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
243 mapping->base = (void *)nt.OptionalHeader.ImageBase;
244 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
245 nt.OptionalHeader.SectionAlignment - 1 );
246 mapping->protect = VPROT_IMAGE;
249 if (mapping->header_size > mapping->size) goto error;
252 release_object( fd );
256 if (sec) free( sec );
257 release_object( fd );
258 set_error( STATUS_INVALID_FILE_FOR_SECTION );
262 /* get the size of the unix file associated with the mapping */
263 inline static int get_file_size( struct file *file, file_pos_t *size )
266 int unix_fd = get_file_unix_fd( file );
268 if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
273 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
274 const WCHAR *name, size_t len )
276 struct mapping *mapping;
279 if (!page_mask) init_page_size();
281 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
283 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
284 return &mapping->obj; /* Nothing else to do */
286 mapping->header_size = 0;
287 mapping->base = NULL;
288 mapping->shared_file = NULL;
289 mapping->shared_size = 0;
291 if (protect & VPROT_READ) access |= GENERIC_READ;
292 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
296 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
297 if (protect & VPROT_IMAGE)
299 if (!get_image_params( mapping )) goto error;
300 return &mapping->obj;
304 if (!get_file_size( mapping->file, &size )) goto error;
307 set_error( STATUS_FILE_INVALID );
313 if (!grow_file( mapping->file, size )) goto error;
316 else /* Anonymous mapping (no associated file) */
318 if (!size || (protect & VPROT_IMAGE))
320 set_error( STATUS_INVALID_PARAMETER );
321 mapping->file = NULL;
324 if (!(mapping->file = create_temp_file( access ))) goto error;
325 if (!grow_file( mapping->file, size )) goto error;
327 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
328 mapping->protect = protect;
329 return &mapping->obj;
332 release_object( mapping );
336 static void mapping_dump( struct object *obj, int verbose )
338 struct mapping *mapping = (struct mapping *)obj;
339 assert( obj->ops == &mapping_ops );
340 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
341 "shared_file=%p shared_size=%08x ",
342 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
343 mapping->protect, mapping->file, mapping->header_size,
344 mapping->base, mapping->shared_file, mapping->shared_size );
345 dump_object_name( &mapping->obj );
346 fputc( '\n', stderr );
349 static struct fd *mapping_get_fd( struct object *obj )
351 struct mapping *mapping = (struct mapping *)obj;
352 return get_obj_fd( (struct object *)mapping->file );
355 static void mapping_destroy( struct object *obj )
357 struct mapping *mapping = (struct mapping *)obj;
358 assert( obj->ops == &mapping_ops );
359 if (mapping->file) release_object( mapping->file );
360 if (mapping->shared_file)
362 release_object( mapping->shared_file );
363 list_remove( &mapping->shared_entry );
367 int get_page_size(void)
369 if (!page_mask) init_page_size();
370 return page_mask + 1;
373 /* create a file mapping */
374 DECL_HANDLER(create_mapping)
377 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
380 if ((obj = create_mapping( size, req->protect, req->file_handle,
381 get_req_data(), get_req_data_size() )))
383 reply->handle = alloc_handle( current->process, obj, req->access,
384 req->attributes & OBJ_INHERIT );
385 release_object( obj );
389 /* open a handle to a mapping */
390 DECL_HANDLER(open_mapping)
392 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
393 &mapping_ops, req->access, req->attributes );
396 /* get a mapping information */
397 DECL_HANDLER(get_mapping_info)
399 struct mapping *mapping;
401 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
404 reply->size_high = (unsigned int)(mapping->size >> 32);
405 reply->size_low = (unsigned int)mapping->size;
406 reply->protect = mapping->protect;
407 reply->header_size = mapping->header_size;
408 reply->base = mapping->base;
409 reply->shared_file = 0;
410 reply->shared_size = mapping->shared_size;
411 if (mapping->shared_file)
412 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
413 GENERIC_READ|GENERIC_WRITE, 0 );
414 release_object( mapping );