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 int size_high; /* mapping size */
43 int size_low; /* mapping size */
44 int protect; /* protection flags */
45 struct file *file; /* file mapped */
46 int header_size; /* size of headers (for PE image mapping) */
47 void *base; /* default base addr (for PE image mapping) */
48 struct file *shared_file; /* temp file for shared PE mapping */
49 int shared_size; /* shared mapping total size */
50 struct mapping *shared_next; /* next in shared PE mapping list */
51 struct mapping *shared_prev; /* prev in shared PE mapping 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 mapping_get_fd, /* get_fd */
67 mapping_destroy /* destroy */
70 static struct mapping *shared_first;
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_ADDR(addr) \
104 ((int)(addr) & ~page_mask)
106 #define ROUND_SIZE(addr,size) \
107 (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
110 /* find the shared PE mapping for a given mapping */
111 static struct file *get_shared_file( struct mapping *mapping )
115 for (ptr = shared_first; ptr; ptr = ptr->shared_next)
116 if (is_same_file( ptr->file, mapping->file ))
117 return (struct file *)grab_object( ptr->shared_file );
121 /* allocate and fill the temp file for a shared PE image mapping */
122 static int build_shared_mapping( struct mapping *mapping, int fd,
123 IMAGE_SECTION_HEADER *sec, int nb_sec )
125 int i, max_size, total_size;
126 off_t shared_pos, read_pos, write_pos;
131 /* compute the total size of the shared mapping */
133 total_size = max_size = 0;
134 for (i = 0; i < nb_sec; i++)
136 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
137 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
139 int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
140 if (size > max_size) max_size = size;
144 if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
146 if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
148 /* create a temp file for the mapping */
150 if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
151 if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
152 if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
154 if (!(buffer = malloc( max_size ))) goto error;
156 /* copy the shared sections data into the temp file */
159 for (i = 0; i < nb_sec; i++)
161 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
162 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
163 write_pos = shared_pos;
164 shared_pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
165 if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
166 !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
167 if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
168 read_pos = sec[i].PointerToRawData;
169 toread = sec[i].SizeOfRawData;
172 long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
173 if (res <= 0) goto error;
177 if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
184 release_object( mapping->shared_file );
185 mapping->shared_file = NULL;
186 if (buffer) free( buffer );
190 /* retrieve the mapping parameters for an executable (PE) image */
191 static int get_image_params( struct mapping *mapping )
193 IMAGE_DOS_HEADER dos;
195 IMAGE_SECTION_HEADER *sec = NULL;
200 /* load the headers */
202 if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
203 unix_fd = get_unix_fd( fd );
204 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
205 if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
208 if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
210 pos += sizeof(nt.Signature);
211 if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
212 if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
214 pos += sizeof(nt.FileHeader);
215 /* zero out Optional header in the case it's not present or partial */
216 memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
217 if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
218 pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
219 pos += nt.FileHeader.SizeOfOptionalHeader;
221 /* load the section headers */
223 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
224 if (!(sec = malloc( size ))) goto error;
225 if (pread( unix_fd, sec, size, pos ) != size) goto error;
227 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
229 if (mapping->shared_file) /* link it in the list */
231 if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
232 mapping->shared_prev = NULL;
233 shared_first = mapping;
236 mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
237 mapping->size_high = 0;
238 mapping->base = (void *)nt.OptionalHeader.ImageBase;
239 mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
240 mapping->protect = VPROT_IMAGE;
243 if (mapping->header_size > mapping->size_low) goto error;
246 release_object( fd );
250 if (sec) free( sec );
251 release_object( fd );
252 set_error( STATUS_INVALID_FILE_FOR_SECTION );
256 /* get the size of the unix file associated with the mapping */
257 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
260 int unix_fd = get_file_unix_fd( file );
262 if (fstat( unix_fd, &st ) == -1) return 0;
263 *size_high = st.st_size >> 32;
264 *size_low = st.st_size & 0xffffffff;
268 static struct object *create_mapping( int size_high, int size_low, int protect,
269 obj_handle_t handle, const WCHAR *name, size_t len )
271 struct mapping *mapping;
274 if (!page_mask) init_page_size();
276 if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
278 if (get_error() == STATUS_OBJECT_NAME_COLLISION)
279 return &mapping->obj; /* Nothing else to do */
281 mapping->header_size = 0;
282 mapping->base = NULL;
283 mapping->shared_file = NULL;
284 mapping->shared_size = 0;
286 if (protect & VPROT_READ) access |= GENERIC_READ;
287 if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
291 if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
292 if (protect & VPROT_IMAGE)
294 if (!get_image_params( mapping )) goto error;
295 return &mapping->obj;
297 if (!size_high && !size_low)
299 if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
300 if (!size_high && !size_low)
302 set_error( STATUS_FILE_INVALID );
308 if (!grow_file( mapping->file, size_high, size_low )) goto error;
311 else /* Anonymous mapping (no associated file) */
313 if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
315 set_error( STATUS_INVALID_PARAMETER );
316 mapping->file = NULL;
319 if (!(mapping->file = create_temp_file( access ))) goto error;
320 if (!grow_file( mapping->file, size_high, size_low )) goto error;
322 mapping->size_high = size_high;
323 mapping->size_low = ROUND_SIZE( 0, size_low );
324 mapping->protect = protect;
325 return &mapping->obj;
328 release_object( mapping );
332 static void mapping_dump( struct object *obj, int verbose )
334 struct mapping *mapping = (struct mapping *)obj;
335 assert( obj->ops == &mapping_ops );
336 fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
337 "shared_file=%p shared_size=%08x ",
338 mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
339 mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
340 dump_object_name( &mapping->obj );
341 fputc( '\n', stderr );
344 static struct fd *mapping_get_fd( struct object *obj )
346 struct mapping *mapping = (struct mapping *)obj;
347 return get_obj_fd( (struct object *)mapping->file );
350 static void mapping_destroy( struct object *obj )
352 struct mapping *mapping = (struct mapping *)obj;
353 assert( obj->ops == &mapping_ops );
354 if (mapping->file) release_object( mapping->file );
355 if (mapping->shared_file)
357 release_object( mapping->shared_file );
358 if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
359 if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
360 else shared_first = mapping->shared_next;
364 int get_page_size(void)
366 if (!page_mask) init_page_size();
367 return page_mask + 1;
370 /* create a file mapping */
371 DECL_HANDLER(create_mapping)
376 if ((obj = create_mapping( req->size_high, req->size_low,
377 req->protect, req->file_handle,
378 get_req_data(), get_req_data_size() )))
380 reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
381 release_object( obj );
385 /* open a handle to a mapping */
386 DECL_HANDLER(open_mapping)
388 reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
389 &mapping_ops, req->access, req->inherit );
392 /* get a mapping information */
393 DECL_HANDLER(get_mapping_info)
395 struct mapping *mapping;
397 if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
400 reply->size_high = mapping->size_high;
401 reply->size_low = mapping->size_low;
402 reply->protect = mapping->protect;
403 reply->header_size = mapping->header_size;
404 reply->base = mapping->base;
405 reply->shared_file = 0;
406 reply->shared_size = mapping->shared_size;
407 if (mapping->shared_file)
408 reply->shared_file = alloc_handle( current->process, mapping->shared_file,
409 GENERIC_READ|GENERIC_WRITE, 0 );
410 release_object( mapping );