| 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, see |
| 18 | * <https://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include "qemu/bswap.h" |
| 23 | |
| 24 | #include "pdb.h" |
| 25 | #include "err.h" |
| 26 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 96 | static void pdb_reader_ds_exit(struct pdb_reader *r) |
| 97 | { |
| 98 | g_free(r->ds.toc); |
| 99 | } |
| 100 | |
| 101 | static void pdb_exit_symbols(struct pdb_reader *r) |
| 102 | { |
| 103 | g_free(r->modimage); |
| 104 | g_free(r->symbols); |
| 105 | } |
| 106 | |
| 107 | static void pdb_exit_segments(struct pdb_reader *r) |
| 108 | { |
| 109 | g_free(r->segs); |
| 110 | } |
| 111 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 299 | void pdb_exit(struct pdb_reader *reader) |
| 300 | { |
| 301 | g_mapped_file_unref(reader->gmf); |
| 302 | pdb_reader_exit(reader); |
| 303 | } |