1 /*
2 * Copyright (c) 2018 Virtuozzo International GmbH
3 *
4 * Based on source of Wine project
5 *
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.
10 *
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.
15 *
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "qemu/osdep.h"
22 #include "qemu/bswap.h"
23
24 #include "pdb.h"
25 #include "err.h"
26
pdb_get_file_size(const struct pdb_reader * r,unsigned idx)27 static uint32_t pdb_get_file_size(const struct pdb_reader *r, unsigned idx)
28 {
29 if (idx >= r->ds.toc->num_files) {
30 return 0;
31 }
32
33 return r->ds.toc->file_size[idx];
34 }
35
get_seg_by_num(struct pdb_reader * r,size_t n)36 static pdb_seg *get_seg_by_num(struct pdb_reader *r, size_t n)
37 {
38 size_t i = 0;
39 char *ptr;
40
41 for (ptr = r->segs; (ptr < r->segs + r->segs_size); ) {
42 i++;
43 ptr += 8;
44 if (i == n) {
45 break;
46 }
47 ptr += sizeof(pdb_seg);
48 }
49
50 return (pdb_seg *)ptr;
51 }
52
pdb_find_public_v3_symbol(struct pdb_reader * r,const char * name)53 uint64_t pdb_find_public_v3_symbol(struct pdb_reader *r, const char *name)
54 {
55 size_t size = pdb_get_file_size(r, r->symbols->gsym_file);
56 int length;
57 const union codeview_symbol *sym;
58 const uint8_t *root = r->modimage;
59 size_t i;
60
61 for (i = 0; i < size; i += length) {
62 sym = (const void *)(root + i);
63 length = sym->generic.len + 2;
64
65 if (!sym->generic.id || length < 4) {
66 break;
67 }
68
69 if (sym->generic.id == S_PUB_V3 &&
70 !strcmp(name, sym->public_v3.name)) {
71 pdb_seg *segment = get_seg_by_num(r, sym->public_v3.segment);
72 uint32_t sect_rva = segment->dword[1];
73 uint64_t rva = sect_rva + sym->public_v3.offset;
74
75 printf("%s: 0x%016x(%d:\'%.8s\') + 0x%08x = 0x%09"PRIx64"\n", name,
76 sect_rva, sym->public_v3.segment,
77 ((char *)segment - 8), sym->public_v3.offset, rva);
78 return rva;
79 }
80 }
81
82 return 0;
83 }
84
pdb_resolve(uint64_t img_base,struct pdb_reader * r,const char * name)85 uint64_t pdb_resolve(uint64_t img_base, struct pdb_reader *r, const char *name)
86 {
87 uint64_t rva = pdb_find_public_v3_symbol(r, name);
88
89 if (!rva) {
90 return 0;
91 }
92
93 return img_base + rva;
94 }
95
pdb_reader_ds_exit(struct pdb_reader * r)96 static void pdb_reader_ds_exit(struct pdb_reader *r)
97 {
98 g_free(r->ds.toc);
99 }
100
pdb_exit_symbols(struct pdb_reader * r)101 static void pdb_exit_symbols(struct pdb_reader *r)
102 {
103 g_free(r->modimage);
104 g_free(r->symbols);
105 }
106
pdb_exit_segments(struct pdb_reader * r)107 static void pdb_exit_segments(struct pdb_reader *r)
108 {
109 g_free(r->segs);
110 }
111
pdb_ds_read(const PDB_DS_HEADER * header,const uint32_t * block_list,int size)112 static void *pdb_ds_read(const PDB_DS_HEADER *header,
113 const uint32_t *block_list, int size)
114 {
115 int i, nBlocks;
116 uint8_t *buffer;
117
118 if (!size) {
119 return NULL;
120 }
121
122 nBlocks = (size + header->block_size - 1) / header->block_size;
123
124 buffer = g_malloc(nBlocks * header->block_size);
125
126 for (i = 0; i < nBlocks; i++) {
127 memcpy(buffer + i * header->block_size, (const char *)header +
128 block_list[i] * header->block_size, header->block_size);
129 }
130
131 return buffer;
132 }
133
pdb_ds_read_file(struct pdb_reader * r,uint32_t file_number)134 static void *pdb_ds_read_file(struct pdb_reader* r, uint32_t file_number)
135 {
136 const uint32_t *block_list;
137 uint32_t block_size;
138 const uint32_t *file_size;
139 size_t i;
140
141 if (!r->ds.toc || file_number >= r->ds.toc->num_files) {
142 return NULL;
143 }
144
145 file_size = r->ds.toc->file_size;
146 r->file_used[file_number / 32] |= 1 << (file_number % 32);
147
148 if (file_size[file_number] == 0 || file_size[file_number] == 0xFFFFFFFF) {
149 return NULL;
150 }
151
152 block_list = file_size + r->ds.toc->num_files;
153 block_size = r->ds.header->block_size;
154
155 for (i = 0; i < file_number; i++) {
156 block_list += (file_size[i] + block_size - 1) / block_size;
157 }
158
159 return pdb_ds_read(r->ds.header, block_list, file_size[file_number]);
160 }
161
pdb_init_segments(struct pdb_reader * r)162 static bool pdb_init_segments(struct pdb_reader *r)
163 {
164 unsigned stream_idx = r->segments;
165
166 r->segs = pdb_ds_read_file(r, stream_idx);
167 if (!r->segs) {
168 return false;
169 }
170
171 r->segs_size = pdb_get_file_size(r, stream_idx);
172 if (!r->segs_size) {
173 return false;
174 }
175
176 return true;
177 }
178
pdb_init_symbols(struct pdb_reader * r)179 static bool pdb_init_symbols(struct pdb_reader *r)
180 {
181 PDB_SYMBOLS *symbols;
182
183 symbols = pdb_ds_read_file(r, 3);
184 if (!symbols) {
185 return false;
186 }
187
188 r->symbols = symbols;
189
190 r->segments = lduw_le_p((const char *)symbols + sizeof(PDB_SYMBOLS) +
191 symbols->module_size + symbols->offset_size +
192 symbols->hash_size + symbols->srcmodule_size +
193 symbols->pdbimport_size + symbols->unknown2_size +
194 offsetof(PDB_STREAM_INDEXES, segments));
195
196 /* Read global symbol table */
197 r->modimage = pdb_ds_read_file(r, symbols->gsym_file);
198 if (!r->modimage) {
199 goto out_symbols;
200 }
201
202 return true;
203
204 out_symbols:
205 g_free(symbols);
206
207 return false;
208 }
209
pdb_reader_ds_init(struct pdb_reader * r,PDB_DS_HEADER * hdr)210 static bool pdb_reader_ds_init(struct pdb_reader *r, PDB_DS_HEADER *hdr)
211 {
212 if (hdr->block_size == 0) {
213 return false;
214 }
215
216 memset(r->file_used, 0, sizeof(r->file_used));
217 r->ds.header = hdr;
218 r->ds.toc = pdb_ds_read(hdr, (uint32_t *)((uint8_t *)hdr +
219 hdr->toc_page * hdr->block_size), hdr->toc_size);
220
221 if (!r->ds.toc) {
222 return false;
223 }
224
225 return true;
226 }
227
pdb_reader_init(struct pdb_reader * r,void * data)228 static bool pdb_reader_init(struct pdb_reader *r, void *data)
229 {
230 const char pdb7[] = "Microsoft C/C++ MSF 7.00";
231
232 if (memcmp(data, pdb7, sizeof(pdb7) - 1)) {
233 return false;
234 }
235
236 if (!pdb_reader_ds_init(r, data)) {
237 return false;
238 }
239
240 r->ds.root = pdb_ds_read_file(r, 1);
241 if (!r->ds.root) {
242 goto out_ds;
243 }
244
245 if (!pdb_init_symbols(r)) {
246 goto out_root;
247 }
248
249 if (!pdb_init_segments(r)) {
250 goto out_sym;
251 }
252
253 return true;
254
255 out_sym:
256 pdb_exit_symbols(r);
257 out_root:
258 g_free(r->ds.root);
259 out_ds:
260 pdb_reader_ds_exit(r);
261
262 return false;
263 }
264
pdb_reader_exit(struct pdb_reader * r)265 static void pdb_reader_exit(struct pdb_reader *r)
266 {
267 pdb_exit_segments(r);
268 pdb_exit_symbols(r);
269 g_free(r->ds.root);
270 pdb_reader_ds_exit(r);
271 }
272
pdb_init_from_file(const char * name,struct pdb_reader * reader)273 bool pdb_init_from_file(const char *name, struct pdb_reader *reader)
274 {
275 GError *gerr = NULL;
276 void *map;
277
278 reader->gmf = g_mapped_file_new(name, TRUE, &gerr);
279 if (gerr) {
280 eprintf("Failed to map PDB file \'%s\'\n", name);
281 g_error_free(gerr);
282 return false;
283 }
284
285 reader->file_size = g_mapped_file_get_length(reader->gmf);
286 map = g_mapped_file_get_contents(reader->gmf);
287 if (!pdb_reader_init(reader, map)) {
288 goto out_unmap;
289 }
290
291 return true;
292
293 out_unmap:
294 g_mapped_file_unref(reader->gmf);
295
296 return false;
297 }
298
pdb_exit(struct pdb_reader * reader)299 void pdb_exit(struct pdb_reader *reader)
300 {
301 g_mapped_file_unref(reader->gmf);
302 pdb_reader_exit(reader);
303 }
304