2 * image.c: Routines for manipulating an image stored in an
3 * extended PE/COFF file.
6 * Miguel de Icaza (miguel@ximian.com)
8 * (C) 2001 Ximian, Inc. http://www.ximian.com
11 * Implement big-endian versions of the reading routines.
20 #include "rawbuffer.h"
24 #define INVALID_ADDRESS 0xffffffff
27 * Keeps track of the various assemblies loaded
29 static GHashTable *loaded_images_hash;
32 mono_cli_rva_image_map (MonoCLIImageInfo *iinfo, guint32 addr)
34 const int top = iinfo->cli_section_count;
35 MonoSectionTable *tables = iinfo->cli_section_tables;
38 for (i = 0; i < top; i++){
39 if ((addr >= tables->st_virtual_address) &&
40 (addr < tables->st_virtual_address + tables->st_raw_data_size)){
41 return addr - tables->st_virtual_address + tables->st_raw_data_ptr;
45 return INVALID_ADDRESS;
49 mono_cli_rva_map (MonoCLIImageInfo *iinfo, guint32 addr)
51 const int top = iinfo->cli_section_count;
52 MonoSectionTable *tables = iinfo->cli_section_tables;
55 for (i = 0; i < top; i++){
56 if ((addr >= tables->st_virtual_address) &&
57 (addr < tables->st_virtual_address + tables->st_raw_data_size)){
58 return iinfo->cli_sections [i] +
59 (addr - tables->st_virtual_address);
67 * mono_image_ensure_section_idx:
68 * @image: The image we are operating on
69 * @section: section number that we will load/map into memory
71 * This routine makes sure that we have an in-memory copy of
72 * an image section (.text, .rsrc, .data).
74 * Returns: TRUE on success
77 mono_image_ensure_section_idx (MonoImage *image, int section)
79 MonoCLIImageInfo *iinfo = image->image_info;
80 MonoSectionTable *sect;
83 g_return_val_if_fail (section < iinfo->cli_section_count, FALSE);
85 if (iinfo->cli_sections [section] != NULL)
88 sect = &iinfo->cli_section_tables [section];
90 writable = sect->st_flags & SECT_FLAGS_MEM_WRITE;
92 iinfo->cli_sections [section] = mono_raw_buffer_load (
93 fileno (image->f), writable,
94 sect->st_raw_data_ptr, sect->st_raw_data_size);
96 if (iinfo->cli_sections [section] == NULL)
103 * mono_image_ensure_section:
104 * @image: The image we are operating on
105 * @section: section name that we will load/map into memory
107 * This routine makes sure that we have an in-memory copy of
108 * an image section (.text, .rsrc, .data).
110 * Returns: TRUE on success
113 mono_image_ensure_section (MonoImage *image, const char *section)
115 MonoCLIImageInfo *ii = image->image_info;
118 for (i = 0; i < ii->cli_section_count; i++){
119 if (strncmp (ii->cli_section_tables [i].st_name, section, 8) != 0)
122 return mono_image_ensure_section_idx (image, i);
128 load_section_tables (MonoImage *image, MonoCLIImageInfo *iinfo)
130 const int top = iinfo->cli_header.coff.coff_sections;
133 iinfo->cli_section_count = top;
134 iinfo->cli_section_tables = g_new0 (MonoSectionTable, top);
135 iinfo->cli_sections = g_new0 (void *, top);
137 for (i = 0; i < top; i++){
138 MonoSectionTable *t = &iinfo->cli_section_tables [i];
140 if (fread (t, sizeof (MonoSectionTable), 1, image->f) != 1)
143 t->st_virtual_size = le32_to_cpu (t->st_virtual_size);
144 t->st_virtual_address = le32_to_cpu (t->st_virtual_address);
145 t->st_raw_data_size = le32_to_cpu (t->st_raw_data_size);
146 t->st_raw_data_ptr = le32_to_cpu (t->st_raw_data_ptr);
147 t->st_reloc_ptr = le32_to_cpu (t->st_reloc_ptr);
148 t->st_lineno_ptr = le32_to_cpu (t->st_lineno_ptr);
149 t->st_reloc_count = le16_to_cpu (t->st_reloc_count);
150 t->st_line_count = le16_to_cpu (t->st_line_count);
153 for (i = 0; i < top; i++)
154 if (!mono_image_ensure_section_idx (image, i))
161 load_cli_header (MonoImage *image, MonoCLIImageInfo *iinfo)
166 offset = mono_cli_rva_image_map (iinfo, iinfo->cli_header.datadir.pe_cli_header.rva);
167 if (offset == INVALID_ADDRESS)
170 if (fseek (image->f, offset, 0) != 0)
173 if ((n = fread (&iinfo->cli_cli_header, sizeof (MonoCLIHeader), 1, image->f)) != 1)
176 /* Catch new uses of the fields that are supposed to be zero */
178 if ((iinfo->cli_cli_header.ch_eeinfo_table.rva != 0) ||
179 (iinfo->cli_cli_header.ch_helper_table.rva != 0) ||
180 (iinfo->cli_cli_header.ch_dynamic_info.rva != 0) ||
181 (iinfo->cli_cli_header.ch_delay_load_info.rva != 0) ||
182 (iinfo->cli_cli_header.ch_module_image.rva != 0) ||
183 (iinfo->cli_cli_header.ch_external_fixups.rva != 0) ||
184 (iinfo->cli_cli_header.ch_ridmap.rva != 0) ||
185 (iinfo->cli_cli_header.ch_debug_map.rva != 0) ||
186 (iinfo->cli_cli_header.ch_ip_map.rva != 0)){
187 g_warning ("Some fields in the CLI header which should have been zero are not zero");
194 load_metadata_ptrs (MonoImage *image, MonoCLIImageInfo *iinfo)
196 MonoMetadata *metadata = &image->metadata;
197 guint32 offset, size;
202 offset = mono_cli_rva_image_map (iinfo, iinfo->cli_cli_header.ch_metadata.rva);
203 size = iinfo->cli_cli_header.ch_metadata.size;
205 metadata->raw_metadata = mono_raw_buffer_load (fileno (image->f), FALSE, offset, size);
206 if (metadata->raw_metadata == NULL)
209 ptr = metadata->raw_metadata;
211 if (strncmp (ptr, "BSJB", 4) == 0){
212 guint32 version_string_len;
215 version_string_len = read32 (ptr);
217 ptr += version_string_len;
218 if (((guint32) ptr) % 4)
219 ptr += 4 - (((guint32) ptr) %4);
223 /* skip over flags */
226 streams = read16 (ptr);
229 for (i = 0; i < streams; i++){
230 if (strncmp (ptr + 8, "#~", 3) == 0){
231 metadata->heap_tables.offset = read32 (ptr);
232 metadata->heap_tables.size = read32 (ptr + 4);
234 } else if (strncmp (ptr + 8, "#Strings", 9) == 0){
235 metadata->heap_strings.offset = read32 (ptr);
236 metadata->heap_strings.size = read32 (ptr + 4);
238 } else if (strncmp (ptr + 8, "#US", 4) == 0){
239 metadata->heap_us.offset = read32 (ptr);
240 metadata->heap_us.size = read32 (ptr + 4);
242 } else if (strncmp (ptr + 8, "#Blob", 6) == 0){
243 metadata->heap_blob.offset = read32 (ptr);
244 metadata->heap_blob.size = read32 (ptr + 4);
246 } else if (strncmp (ptr + 8, "#GUID", 6) == 0){
247 metadata->heap_guid.offset = read32 (ptr);
248 metadata->heap_guid.size = read32 (ptr + 4);
251 g_message ("Unknown heap type: %s\n", ptr + 8);
252 if (((guint32)ptr) % 4){
253 ptr += 4 - (((guint32)ptr) % 4);
260 * Load representation of logical metadata tables, from the "#~" stream
263 load_tables (MonoImage *image, MonoMetadata *meta)
265 char *heap_tables = meta->raw_metadata + meta->heap_tables.offset;
268 int valid = 0, table;
271 heap_sizes = heap_tables [6];
272 meta->idx_string_wide = ((heap_sizes & 0x01) == 1);
273 meta->idx_guid_wide = ((heap_sizes & 0x02) == 2);
274 meta->idx_blob_wide = ((heap_sizes & 0x04) == 4);
276 valid_mask = read64 (heap_tables + 8);
277 rows = (guint32 *) (heap_tables + 24);
279 for (table = 0; table < 64; table++){
280 if ((valid_mask & ((guint64) 1 << table)) == 0){
281 meta->tables [table].rows = 0;
285 g_warning("bits in valid must be zero above 0x2b (II - 23.1.6)");
287 meta->tables [table].rows = read32 (rows);
292 meta->tables_base = (heap_tables + 24) + (4 * valid);
294 /* They must be the same */
295 g_assert ((void *) meta->tables_base == (void *) rows);
297 mono_metadata_compute_table_bases (meta);
302 load_metadata (MonoImage *image, MonoCLIImageInfo *iinfo)
304 if (!load_metadata_ptrs (image, iinfo))
307 return load_tables (image, &image->metadata);
311 do_mono_image_open (const char *fname, enum MonoImageOpenStatus *status)
313 MonoCLIImageInfo *iinfo;
314 MonoDotNetHeader *header;
315 MonoMSDOSHeader msdos;
319 image = g_new0 (MonoImage, 1);
320 image->f = fopen (fname, "r");
321 image->name = g_strdup (fname);
322 iinfo = g_new0 (MonoCLIImageInfo, 1);
323 image->image_info = iinfo;
325 image->method_cache = g_hash_table_new (g_direct_hash, g_direct_equal);
326 image->class_cache = g_hash_table_new (g_direct_hash, g_direct_equal);
327 image->array_cache = g_hash_table_new (g_direct_hash, g_direct_equal);
329 header = &iinfo->cli_header;
331 if (image->f == NULL){
333 *status = MONO_IMAGE_ERROR_ERRNO;
334 mono_image_close (image);
339 *status = MONO_IMAGE_IMAGE_INVALID;
341 if (fread (&msdos, sizeof (msdos), 1, image->f) != 1)
344 if (!(msdos.msdos_header [0] == 0x4d && msdos.msdos_header [1] == 0x5a))
347 if ((n = fread (header, sizeof (MonoDotNetHeader), 1, image->f)) != 1)
351 * FIXME: byte swap all addresses here for header.
354 if (!load_section_tables (image, iinfo))
357 /* Load the CLI header */
358 if (!load_cli_header (image, iinfo))
361 if (!load_metadata (image, iinfo))
365 *status = MONO_IMAGE_OK;
370 mono_image_close (image);
376 * @fname: filename that points to the module we want to open
377 * @status: An error condition is returned in this field
379 * Retuns: An open image of type %MonoImage or NULL on error.
380 * if NULL, then check the value of @status for details on the error
383 mono_image_open (const char *fname, enum MonoImageOpenStatus *status)
387 g_return_val_if_fail (fname != NULL, NULL);
389 if (loaded_images_hash){
390 image = g_hash_table_lookup (loaded_images_hash, fname);
397 image = do_mono_image_open (fname, status);
401 if (!loaded_images_hash)
402 loaded_images_hash = g_hash_table_new (g_str_hash, g_str_equal);
403 g_hash_table_insert (loaded_images_hash, image->name, image);
410 * @image: The image file we wish to close
412 * Closes an image file, deallocates all memory consumed and
413 * unmaps all possible sections of the file
416 mono_image_close (MonoImage *image)
418 g_return_if_fail (image != NULL);
420 if (--image->ref_count)
423 g_hash_table_remove (loaded_images_hash, image->name);
428 g_free (image->name);
430 if (image->metadata.raw_metadata != NULL)
431 mono_raw_buffer_free (image->metadata.raw_metadata);
433 if (image->image_info){
434 MonoCLIImageInfo *ii = image->image_info;
437 for (i = 0; i < ii->cli_section_count; i++){
438 if (!ii->cli_sections [i])
440 mono_raw_buffer_free (ii->cli_sections [i]);
442 if (ii->cli_section_tables)
443 g_free (ii->cli_section_tables);
444 if (ii->cli_sections)
445 g_free (ii->cli_sections);
446 g_free (image->image_info);
453 * mono_image_strerror:
454 * @status: an code indicating the result from a recent operation
456 * Returns: a string describing the error
459 mono_image_strerror (enum MonoImageOpenStatus status)
464 case MONO_IMAGE_ERROR_ERRNO:
465 return strerror (errno);
466 case MONO_IMAGE_IMAGE_INVALID:
467 return "File does not contain a valid CIL image";
468 case MONO_IMAGE_MISSING_ASSEMBLYREF:
469 return "An assembly was referenced, but could not be found";
471 return "Internal error";