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 | |
23 | #include "pdb.h" |
24 | #include "err.h" |
25 | |
26 | static uint32_t pdb_get_file_size(const struct pdb_reader *r, unsigned idx) |
27 | { |
28 | return r->ds.toc->file_size[idx]; |
29 | } |
30 | |
31 | static pdb_seg *get_seg_by_num(struct pdb_reader *r, size_t n) |
32 | { |
33 | size_t i = 0; |
34 | char *ptr; |
35 | |
36 | for (ptr = r->segs; (ptr < r->segs + r->segs_size); ) { |
37 | i++; |
38 | ptr += 8; |
39 | if (i == n) { |
40 | break; |
41 | } |
42 | ptr += sizeof(pdb_seg); |
43 | } |
44 | |
45 | return (pdb_seg *)ptr; |
46 | } |
47 | |
48 | uint64_t pdb_find_public_v3_symbol(struct pdb_reader *r, const char *name) |
49 | { |
50 | size_t size = pdb_get_file_size(r, r->symbols->gsym_file); |
51 | int length; |
52 | const union codeview_symbol *sym; |
53 | const uint8_t *root = r->modimage; |
54 | size_t i; |
55 | |
56 | for (i = 0; i < size; i += length) { |
57 | sym = (const void *)(root + i); |
58 | length = sym->generic.len + 2; |
59 | |
60 | if (!sym->generic.id || length < 4) { |
61 | break; |
62 | } |
63 | |
64 | if (sym->generic.id == S_PUB_V3 && |
65 | !strcmp(name, sym->public_v3.name)) { |
66 | pdb_seg *segment = get_seg_by_num(r, sym->public_v3.segment); |
67 | uint32_t sect_rva = segment->dword[1]; |
68 | uint64_t rva = sect_rva + sym->public_v3.offset; |
69 | |
70 | printf("%s: 0x%016x(%d:\'%.8s\') + 0x%08x = 0x%09" PRIx64"\n" , name, |
71 | sect_rva, sym->public_v3.segment, |
72 | ((char *)segment - 8), sym->public_v3.offset, rva); |
73 | return rva; |
74 | } |
75 | } |
76 | |
77 | return 0; |
78 | } |
79 | |
80 | uint64_t pdb_resolve(uint64_t img_base, struct pdb_reader *r, const char *name) |
81 | { |
82 | uint64_t rva = pdb_find_public_v3_symbol(r, name); |
83 | |
84 | if (!rva) { |
85 | return 0; |
86 | } |
87 | |
88 | return img_base + rva; |
89 | } |
90 | |
91 | static void pdb_reader_ds_exit(struct pdb_reader *r) |
92 | { |
93 | free(r->ds.toc); |
94 | } |
95 | |
96 | static void pdb_exit_symbols(struct pdb_reader *r) |
97 | { |
98 | free(r->modimage); |
99 | free(r->symbols); |
100 | } |
101 | |
102 | static void pdb_exit_segments(struct pdb_reader *r) |
103 | { |
104 | free(r->segs); |
105 | } |
106 | |
107 | static void *pdb_ds_read(const PDB_DS_HEADER *, |
108 | const uint32_t *block_list, int size) |
109 | { |
110 | int i, nBlocks; |
111 | uint8_t *buffer; |
112 | |
113 | if (!size) { |
114 | return NULL; |
115 | } |
116 | |
117 | nBlocks = (size + header->block_size - 1) / header->block_size; |
118 | |
119 | buffer = malloc(nBlocks * header->block_size); |
120 | if (!buffer) { |
121 | return NULL; |
122 | } |
123 | |
124 | for (i = 0; i < nBlocks; i++) { |
125 | memcpy(buffer + i * header->block_size, (const char *)header + |
126 | block_list[i] * header->block_size, header->block_size); |
127 | } |
128 | |
129 | return buffer; |
130 | } |
131 | |
132 | static void *pdb_ds_read_file(struct pdb_reader* r, uint32_t file_number) |
133 | { |
134 | const uint32_t *block_list; |
135 | uint32_t block_size; |
136 | const uint32_t *file_size; |
137 | size_t i; |
138 | |
139 | if (!r->ds.toc || file_number >= r->ds.toc->num_files) { |
140 | return NULL; |
141 | } |
142 | |
143 | file_size = r->ds.toc->file_size; |
144 | r->file_used[file_number / 32] |= 1 << (file_number % 32); |
145 | |
146 | if (file_size[file_number] == 0 || file_size[file_number] == 0xFFFFFFFF) { |
147 | return NULL; |
148 | } |
149 | |
150 | block_list = file_size + r->ds.toc->num_files; |
151 | block_size = r->ds.header->block_size; |
152 | |
153 | for (i = 0; i < file_number; i++) { |
154 | block_list += (file_size[i] + block_size - 1) / block_size; |
155 | } |
156 | |
157 | return pdb_ds_read(r->ds.header, block_list, file_size[file_number]); |
158 | } |
159 | |
160 | static int pdb_init_segments(struct pdb_reader *r) |
161 | { |
162 | char *segs; |
163 | unsigned stream_idx = r->sidx.segments; |
164 | |
165 | segs = pdb_ds_read_file(r, stream_idx); |
166 | if (!segs) { |
167 | return 1; |
168 | } |
169 | |
170 | r->segs = segs; |
171 | r->segs_size = pdb_get_file_size(r, stream_idx); |
172 | |
173 | return 0; |
174 | } |
175 | |
176 | static int pdb_init_symbols(struct pdb_reader *r) |
177 | { |
178 | int err = 0; |
179 | PDB_SYMBOLS *symbols; |
180 | PDB_STREAM_INDEXES *sidx = &r->sidx; |
181 | |
182 | memset(sidx, -1, sizeof(*sidx)); |
183 | |
184 | symbols = pdb_ds_read_file(r, 3); |
185 | if (!symbols) { |
186 | return 1; |
187 | } |
188 | |
189 | r->symbols = symbols; |
190 | |
191 | if (symbols->stream_index_size != sizeof(PDB_STREAM_INDEXES)) { |
192 | err = 1; |
193 | goto out_symbols; |
194 | } |
195 | |
196 | memcpy(sidx, (const char *)symbols + sizeof(PDB_SYMBOLS) + |
197 | symbols->module_size + symbols->offset_size + |
198 | symbols->hash_size + symbols->srcmodule_size + |
199 | symbols->pdbimport_size + symbols->unknown2_size, sizeof(*sidx)); |
200 | |
201 | /* Read global symbol table */ |
202 | r->modimage = pdb_ds_read_file(r, symbols->gsym_file); |
203 | if (!r->modimage) { |
204 | err = 1; |
205 | goto out_symbols; |
206 | } |
207 | |
208 | return 0; |
209 | |
210 | out_symbols: |
211 | free(symbols); |
212 | |
213 | return err; |
214 | } |
215 | |
216 | static int pdb_reader_ds_init(struct pdb_reader *r, PDB_DS_HEADER *hdr) |
217 | { |
218 | memset(r->file_used, 0, sizeof(r->file_used)); |
219 | r->ds.header = hdr; |
220 | r->ds.toc = pdb_ds_read(hdr, (uint32_t *)((uint8_t *)hdr + |
221 | hdr->toc_page * hdr->block_size), hdr->toc_size); |
222 | |
223 | if (!r->ds.toc) { |
224 | return 1; |
225 | } |
226 | |
227 | return 0; |
228 | } |
229 | |
230 | static int pdb_reader_init(struct pdb_reader *r, void *data) |
231 | { |
232 | int err = 0; |
233 | const char pdb7[] = "Microsoft C/C++ MSF 7.00" ; |
234 | |
235 | if (memcmp(data, pdb7, sizeof(pdb7) - 1)) { |
236 | return 1; |
237 | } |
238 | |
239 | if (pdb_reader_ds_init(r, data)) { |
240 | return 1; |
241 | } |
242 | |
243 | r->ds.root = pdb_ds_read_file(r, 1); |
244 | if (!r->ds.root) { |
245 | err = 1; |
246 | goto out_ds; |
247 | } |
248 | |
249 | if (pdb_init_symbols(r)) { |
250 | err = 1; |
251 | goto out_root; |
252 | } |
253 | |
254 | if (pdb_init_segments(r)) { |
255 | err = 1; |
256 | goto out_sym; |
257 | } |
258 | |
259 | return 0; |
260 | |
261 | out_sym: |
262 | pdb_exit_symbols(r); |
263 | out_root: |
264 | free(r->ds.root); |
265 | out_ds: |
266 | pdb_reader_ds_exit(r); |
267 | |
268 | return err; |
269 | } |
270 | |
271 | static void pdb_reader_exit(struct pdb_reader *r) |
272 | { |
273 | pdb_exit_segments(r); |
274 | pdb_exit_symbols(r); |
275 | free(r->ds.root); |
276 | pdb_reader_ds_exit(r); |
277 | } |
278 | |
279 | int pdb_init_from_file(const char *name, struct pdb_reader *reader) |
280 | { |
281 | GError *gerr = NULL; |
282 | int err = 0; |
283 | void *map; |
284 | |
285 | reader->gmf = g_mapped_file_new(name, TRUE, &gerr); |
286 | if (gerr) { |
287 | eprintf("Failed to map PDB file \'%s\'\n" , name); |
288 | return 1; |
289 | } |
290 | |
291 | reader->file_size = g_mapped_file_get_length(reader->gmf); |
292 | map = g_mapped_file_get_contents(reader->gmf); |
293 | if (pdb_reader_init(reader, map)) { |
294 | err = 1; |
295 | goto out_unmap; |
296 | } |
297 | |
298 | return 0; |
299 | |
300 | out_unmap: |
301 | g_mapped_file_unref(reader->gmf); |
302 | |
303 | return err; |
304 | } |
305 | |
306 | void pdb_exit(struct pdb_reader *reader) |
307 | { |
308 | g_mapped_file_unref(reader->gmf); |
309 | pdb_reader_exit(reader); |
310 | } |
311 | |