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 mapping *shared_next; /* next in shared PE mapping list */
50 struct mapping *shared_prev; /* prev in shared PE mapping list */
53 static void mapping_dump( struct object *obj, int verbose );
54 static struct fd *mapping_get_fd( struct object *obj );
55 static void mapping_destroy( struct object *obj );
57 static const struct object_ops mapping_ops =
59 sizeof(struct mapping), /* size */
60 mapping_dump, /* dump */
61 no_add_queue, /* add_queue */
62 NULL, /* remove_queue */
65 mapping_get_fd, /* get_fd */
66 mapping_destroy /* destroy */
69 static struct mapping *shared_first;
73 /* These are always the same on an i386, and it will be faster this way */
74 # define page_mask 0xfff
75 # define page_shift 12
76 # define init_page_size() do { /* nothing */ } while(0)
80 static int page_shift, page_mask;
82 static void init_page_size(void)
85 # ifdef HAVE_GETPAGESIZE
86 page_size = getpagesize();
89 page_size = sysconf(_SC_PAGESIZE);
91 # error Cannot get the page size on this platform
94 page_mask = page_size - 1;
95 /* Make sure we have a power of 2 */
96 assert( !(page_size & page_mask) );
98 while ((1 << page_shift) != page_size) page_shift++;
100 #endif /* __i386__ */
102 #define ROUND_SIZE_MASK(addr,size,mask) \
103 (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
105 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
108 /* find the shared PE mapping for a given mapping */
109 static struct file *get_shared_file( struct mapping *mapping )
113 for (ptr = shared_first; ptr; ptr = ptr->shared_next)
114 if (is_same_file( ptr->file, mapping->file ))
115 return (struct file *)grab_object( ptr->shared_file );
119 /* allocate and fill the temp file for a shared PE image mapping */
120 static int build_shared_mapping( struct mapping *mapping, int fd,
121 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
123 unsigned int i, max_size, total_size;
124 off_t shared_pos, read_pos, write_pos;
129 /* compute the total size of the shared mapping */
131 total_size = max_size = 0;
132 for (i = 0; i < nb_sec; i++)
134 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
135 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
137 unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
138 if (size > max_size) max_size = size;
142 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
144 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
146 /* create a temp file for the mapping */
148 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
149 if (!grow_file( mapping->shared_file, total_size )) goto error;
150 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
152 if (!(buffer = malloc( max_size ))) goto error;
154 /* copy the shared sections data into the temp file */
157 for (i = 0; i < nb_sec; i++)
159 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
160 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
161 write_pos = shared_pos;
162 shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
163 if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
164 !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
165 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
166 read_pos = sec[i].PointerToRawData;
167 toread = sec[i].SizeOfRawData;
170 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
171 if (res <= 0) goto error;
175 if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
182 release_object( mapping->shared_file );
183 mapping->shared_file = NULL;
184 if (buffer) free( buffer );
188 /* retrieve the mapping parameters for an executable (PE) image */
189 static int get_image_params( struct mapping *mapping )
191 IMAGE_DOS_HEADER dos;
193 IMAGE_SECTION_HEADER *sec = NULL;
198 /* load the headers */
200 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
201 unix_fd = get_unix_fd( fd );
202 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
203 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
206 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
208 pos += sizeof(nt.Signature);
209 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
210 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
212 pos += sizeof(nt.FileHeader);
213 /* zero out Optional header in the case it's not present or partial */
214 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
215 if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
216 pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
217 pos += nt.FileHeader.SizeOfOptionalHeader;
219 /* load the section headers */
221 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
222 if (!(sec = malloc( size ))) goto error;
223 if (pread( unix_fd, sec, size, pos ) != size) goto error;
225 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
227 if (mapping->shared_file) /* link it in the list */
229 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
230 mapping->shared_prev = NULL;
231 shared_first = mapping;
234 mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
235 mapping->base = (void *)nt.OptionalHeader.ImageBase;
236 mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
237 nt.OptionalHeader.SectionAlignment - 1 );
238 mapping->protect = VPROT_IMAGE;
241 if (mapping->header_size > mapping->size) goto error;
244 release_object( fd );
248 if (sec) free( sec );
249 release_object( fd );
250 set_error( STATUS_INVALID_FILE_FOR_SECTION );
254 /* get the size of the unix file associated with the mapping */
255 inline static int get_file_size( struct file *file, file_pos_t *size )
258 int unix_fd = get_file_unix_fd( file );
260 if (fstat( unix_fd, &st ) == -1) return 0;
265 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
266 const WCHAR *name, size_t len )
268 struct mapping *mapping;
271 if (!page_mask) init_page_size();
273 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
275 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
276 return &mapping->obj; /* Nothing else to do */
278 mapping->header_size = 0;
279 mapping->base = NULL;
280 mapping->shared_file = NULL;
281 mapping->shared_size = 0;
283 if (protect & VPROT_READ) access |= GENERIC_READ;
284 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
288 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
289 if (protect & VPROT_IMAGE)
291 if (!get_image_params( mapping )) goto error;
292 return &mapping->obj;
296 if (!get_file_size( mapping->file, &size )) goto error;
299 set_error( STATUS_FILE_INVALID );
305 if (!grow_file( mapping->file, size )) goto error;
308 else /* Anonymous mapping (no associated file) */
310 if (!size || (protect & VPROT_IMAGE))
312 set_error( STATUS_INVALID_PARAMETER );
313 mapping->file = NULL;
316 if (!(mapping->file = create_temp_file( access ))) goto error;
317 if (!grow_file( mapping->file, size )) goto error;
319 mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
320 mapping->protect = protect;
321 return &mapping->obj;
324 release_object( mapping );
328 static void mapping_dump( struct object *obj, int verbose )
330 struct mapping *mapping = (struct mapping *)obj;
331 assert( obj->ops == &mapping_ops );
332 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
333 "shared_file=%p shared_size=%08x ",
334 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
335 mapping->protect, mapping->file, mapping->header_size,
336 mapping->base, mapping->shared_file, mapping->shared_size );
337 dump_object_name( &mapping->obj );
338 fputc( '\n', stderr );
341 static struct fd *mapping_get_fd( struct object *obj )
343 struct mapping *mapping = (struct mapping *)obj;
344 return get_obj_fd( (struct object *)mapping->file );
347 static void mapping_destroy( struct object *obj )
349 struct mapping *mapping = (struct mapping *)obj;
350 assert( obj->ops == &mapping_ops );
351 if (mapping->file) release_object( mapping->file );
352 if (mapping->shared_file)
354 release_object( mapping->shared_file );
355 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
356 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
357 else shared_first = mapping->shared_next;
361 int get_page_size(void)
363 if (!page_mask) init_page_size();
364 return page_mask + 1;
367 /* create a file mapping */
368 DECL_HANDLER(create_mapping)
371 file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
374 if ((obj = create_mapping( size, req->protect, req->file_handle,
375 get_req_data(), get_req_data_size() )))
377 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
378 release_object( obj );
382 /* open a handle to a mapping */
383 DECL_HANDLER(open_mapping)
385 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
386 &mapping_ops, req->access, req->inherit );
389 /* get a mapping information */
390 DECL_HANDLER(get_mapping_info)
392 struct mapping *mapping;
394 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
397 reply->size_high = (unsigned int)(mapping->size >> 32);
398 reply->size_low = (unsigned int)mapping->size;
399 reply->protect = mapping->protect;
400 reply->header_size = mapping->header_size;
401 reply->base = mapping->base;
402 reply->shared_file = 0;
403 reply->shared_size = mapping->shared_size;
404 if (mapping->shared_file)
405 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
406 GENERIC_READ|GENERIC_WRITE, 0 );
407 release_object( mapping );