2 * assembly.c: Routines for manipulating and assembly 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 * Do byteswaps for big-endian systems on the various headers.
20 #include "rawbuffer.h"
22 #define INVALID_ADDRESS 0xffffffff
24 /* FIXME: implement big endian versions */
25 #define le64_to_cpu(x) (x)
26 #define le32_to_cpu(x) (x)
27 #define le16_to_cpu(x) (x)
28 #define read32(x) le32_to_cpu (*((guint32 *) (x)))
29 #define read16(x) le16_to_cpu (*((guint16 *) (x)))
30 #define read64(x) le64_to_cpu (*((guint64 *) (x)))
33 coff_map (dotnet_image_info_t *iinfo, guint32 addr)
35 const int top = iinfo->dn_section_count;
36 section_table_t *tables = iinfo->dn_section_tables;
39 for (i = 0; i < top; i++){
40 if ((addr >= tables->st_virtual_address) &&
41 (addr < tables->st_virtual_address + tables->st_raw_data_size)){
42 return addr - tables->st_virtual_address + tables->st_raw_data_ptr;
46 return INVALID_ADDRESS;
50 load_section_tables (MonoAssembly *assembly, dotnet_image_info_t *iinfo)
52 const int top = iinfo->dn_header.coff.coff_sections;
55 iinfo->dn_section_count = top;
56 iinfo->dn_section_tables = g_new (section_table_t, top);
58 for (i = 0; i < top; i++){
59 section_table_t *t = &iinfo->dn_section_tables [i];
61 if (fread (t, sizeof (section_table_t), 1, assembly->f) != 1)
64 t->st_virtual_size = le32_to_cpu (t->st_virtual_size);
65 t->st_virtual_address = le32_to_cpu (t->st_virtual_address);
66 t->st_raw_data_size = le32_to_cpu (t->st_raw_data_size);
67 t->st_raw_data_ptr = le32_to_cpu (t->st_raw_data_ptr);
68 t->st_reloc_ptr = le32_to_cpu (t->st_reloc_ptr);
69 t->st_lineno_ptr = le32_to_cpu (t->st_lineno_ptr);
70 t->st_reloc_count = le16_to_cpu (t->st_reloc_count);
71 t->st_line_count = le16_to_cpu (t->st_line_count);
78 load_cli_header (MonoAssembly *assembly, dotnet_image_info_t *iinfo)
83 offset = coff_map (iinfo, iinfo->dn_header.datadir.pe_cli_header.rva);
84 if (offset == INVALID_ADDRESS)
87 if (fseek (assembly->f, offset, 0) != 0)
90 if ((n = fread (&iinfo->dn_cli_header, sizeof (cli_header_t), 1, assembly->f)) != 1)
93 /* Catch new uses of the fields that are supposed to be zero */
95 if ((iinfo->dn_cli_header.ch_eeinfo_table.rva != 0) ||
96 (iinfo->dn_cli_header.ch_helper_table.rva != 0) ||
97 (iinfo->dn_cli_header.ch_dynamic_info.rva != 0) ||
98 (iinfo->dn_cli_header.ch_delay_load_info.rva != 0) ||
99 (iinfo->dn_cli_header.ch_module_image.rva != 0) ||
100 (iinfo->dn_cli_header.ch_external_fixups.rva != 0) ||
101 (iinfo->dn_cli_header.ch_ridmap.rva != 0) ||
102 (iinfo->dn_cli_header.ch_debug_map.rva != 0) ||
103 (iinfo->dn_cli_header.ch_ip_map.rva != 0)){
104 g_message ("Some fields in the CLI header which should have been zero are not zero");
111 load_metadata_ptrs (MonoAssembly *assembly, dotnet_image_info_t *iinfo)
113 metadata_t *metadata = &iinfo->dn_metadata;
114 guint32 offset, size;
119 offset = coff_map (iinfo, iinfo->dn_cli_header.ch_metadata.rva);
120 size = iinfo->dn_cli_header.ch_metadata.size;
122 metadata->raw_metadata = raw_buffer_load (fileno (assembly->f), FALSE, offset, size);
123 if (metadata->raw_metadata == NULL)
126 ptr = metadata->raw_metadata;
128 if (strncmp (ptr, "BSJB", 4) == 0){
129 guint32 version_string_len;
132 version_string_len = read32 (ptr);
134 ptr += version_string_len;
135 if (((guint32) ptr) % 4)
136 ptr += 4 - (((guint32) ptr) %4);
140 /* skip over flags */
143 streams = read16 (ptr);
146 for (i = 0; i < streams; i++){
147 if (strncmp (ptr + 8, "#~", 3) == 0){
148 metadata->heap_tables.sh_offset = read32 (ptr);
149 metadata->heap_tables.sh_size = read32 (ptr + 4);
151 } else if (strncmp (ptr + 8, "#Strings", 9) == 0){
152 metadata->heap_strings.sh_offset = read32 (ptr);
153 metadata->heap_strings.sh_size = read32 (ptr + 4);
155 } else if (strncmp (ptr + 8, "#US", 4) == 0){
156 metadata->heap_us.sh_offset = read32 (ptr);
157 metadata->heap_us.sh_size = read32 (ptr + 4);
159 } else if (strncmp (ptr + 8, "#Blob", 6) == 0){
160 metadata->heap_blob.sh_offset = read32 (ptr);
161 metadata->heap_blob.sh_size = read32 (ptr + 4);
163 } else if (strncmp (ptr + 8, "#GUID", 6) == 0){
164 metadata->heap_guid.sh_offset = read32 (ptr);
165 metadata->heap_guid.sh_size = read32 (ptr + 4);
168 g_message ("Unknown heap type: %s\n", ptr + 8);
169 if (((guint32)ptr) % 4){
170 ptr += 4 - (((guint32)ptr) % 4);
177 * Load representation of logical metadata tables, from the "#~" stream
180 load_tables (MonoAssembly *assembly, metadata_t *meta)
182 char *heap_tables = meta->raw_metadata + meta->heap_tables.sh_offset;
185 int valid = 0, table;
188 heap_sizes = heap_tables [6];
189 meta->idx_string_wide = ((heap_sizes & 0x01) == 1);
190 meta->idx_guid_wide = ((heap_sizes & 0x02) == 2);
191 meta->idx_blob_wide = ((heap_sizes & 0x04) == 4);
193 valid_mask = read64 (heap_tables + 8);
194 rows = (guint32 *) (heap_tables + 24);
196 for (table = 0; table < 64; table++){
197 if ((valid_mask & ((guint64) 1 << table)) == 0){
198 meta->tables [table].rows = 0;
201 meta->tables [table].rows = read32 (rows);
206 meta->tables_base = (heap_tables + 24) + (4 * valid);
208 /* They must be the same */
209 g_assert (meta->tables_base == rows);
211 mono_metadata_compute_table_bases (meta);
216 load_metadata (MonoAssembly *assembly, dotnet_image_info_t *iinfo)
218 if (!load_metadata_ptrs (assembly, iinfo))
221 return load_tables (assembly, &iinfo->dn_metadata);
225 mono_assembly_open (const char *fname, enum MonoAssemblyOpenStatus *status)
227 dotnet_image_info_t *iinfo;
228 dotnet_header_t *header;
229 msdos_header_t msdos;
230 MonoAssembly *assembly;
233 assembly = g_new (MonoAssembly, 1);
234 assembly->f = fopen (fname, "r");
235 iinfo = g_new (dotnet_image_info_t, 1);
236 assembly->image_info = iinfo;
238 header = &iinfo->dn_header;
240 if (assembly->f == NULL){
242 *status = MONO_ASSEMBLY_ERROR_ERRNO;
243 mono_assembly_close (assembly);
248 *status = MONO_ASSEMBLY_IMAGE_INVALID;
250 if (fread (&msdos, sizeof (msdos), 1, assembly->f) != 1)
253 if (!(msdos.msdos_header [0] == 0x4d && msdos.msdos_header [1] == 0x5a))
256 if ((n = fread (header, sizeof (dotnet_header_t), 1, assembly->f)) != 1)
260 * FIXME: byte swap all addresses here for header.
263 if (!load_section_tables (assembly, iinfo))
266 /* Load the CLI header */
267 if (!load_cli_header (assembly, iinfo))
270 if (!load_metadata (assembly, iinfo))
274 *status = MONO_ASSEMBLY_OK;
279 mono_assembly_close (assembly);
284 mono_assembly_close (MonoAssembly *assembly)
286 g_return_if_fail (assembly != NULL);
289 fclose (assembly->f);
291 if (assembly->image_info){
292 dotnet_image_info_t *ii = assembly->image_info;
294 if (ii->dn_metadata.raw_metadata != NULL)
295 raw_buffer_free (ii->dn_metadata.raw_metadata);
297 if (ii->dn_section_tables)
298 g_free (ii->dn_section_tables);
300 g_free (assembly->image_info);
307 mono_assembly_strerror (enum MonoAssemblyOpenStatus status)
310 case MONO_ASSEMBLY_OK:
312 case MONO_ASSEMBLY_ERROR_ERRNO:
313 return strerror (errno);
314 case MONO_ASSEMBLY_IMAGE_INVALID:
315 return "File does not contain a valid CIL image";
317 return "Internal error";