Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Postprocess module symbol versions |
| 2 | * |
| 3 | * Copyright 2003 Kai Germaschewski |
| 4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation |
| 5 | * |
| 6 | * Based in part on module-init-tools/depmod.c,file2alias |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms |
| 9 | * of the GNU General Public License, incorporated herein by reference. |
| 10 | * |
| 11 | * Usage: modpost vmlinux module1.o module2.o ... |
| 12 | */ |
| 13 | |
| 14 | #include <ctype.h> |
| 15 | #include "modpost.h" |
| 16 | |
| 17 | /* Are we using CONFIG_MODVERSIONS? */ |
| 18 | int modversions = 0; |
| 19 | /* Warn about undefined symbols? (do so if we have vmlinux) */ |
| 20 | int have_vmlinux = 0; |
| 21 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ |
| 22 | static int all_versions = 0; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 23 | /* If we are modposting external module set to 1 */ |
| 24 | static int external_module = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 26 | void fatal(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
| 28 | va_list arglist; |
| 29 | |
| 30 | fprintf(stderr, "FATAL: "); |
| 31 | |
| 32 | va_start(arglist, fmt); |
| 33 | vfprintf(stderr, fmt, arglist); |
| 34 | va_end(arglist); |
| 35 | |
| 36 | exit(1); |
| 37 | } |
| 38 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 39 | void warn(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
| 41 | va_list arglist; |
| 42 | |
| 43 | fprintf(stderr, "WARNING: "); |
| 44 | |
| 45 | va_start(arglist, fmt); |
| 46 | vfprintf(stderr, fmt, arglist); |
| 47 | va_end(arglist); |
| 48 | } |
| 49 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 50 | static int is_vmlinux(const char *modname) |
| 51 | { |
| 52 | const char *myname; |
| 53 | |
| 54 | if ((myname = strrchr(modname, '/'))) |
| 55 | myname++; |
| 56 | else |
| 57 | myname = modname; |
| 58 | |
| 59 | return strcmp(myname, "vmlinux") == 0; |
| 60 | } |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | void *do_nofail(void *ptr, const char *expr) |
| 63 | { |
| 64 | if (!ptr) { |
| 65 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
| 66 | } |
| 67 | return ptr; |
| 68 | } |
| 69 | |
| 70 | /* A list of all modules we processed */ |
| 71 | |
| 72 | static struct module *modules; |
| 73 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 74 | static struct module *find_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | struct module *mod; |
| 77 | |
| 78 | for (mod = modules; mod; mod = mod->next) |
| 79 | if (strcmp(mod->name, modname) == 0) |
| 80 | break; |
| 81 | return mod; |
| 82 | } |
| 83 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 84 | static struct module *new_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
| 86 | struct module *mod; |
| 87 | char *p, *s; |
| 88 | |
| 89 | mod = NOFAIL(malloc(sizeof(*mod))); |
| 90 | memset(mod, 0, sizeof(*mod)); |
| 91 | p = NOFAIL(strdup(modname)); |
| 92 | |
| 93 | /* strip trailing .o */ |
| 94 | if ((s = strrchr(p, '.')) != NULL) |
| 95 | if (strcmp(s, ".o") == 0) |
| 96 | *s = '\0'; |
| 97 | |
| 98 | /* add to list */ |
| 99 | mod->name = p; |
| 100 | mod->next = modules; |
| 101 | modules = mod; |
| 102 | |
| 103 | return mod; |
| 104 | } |
| 105 | |
| 106 | /* A hash of all exported symbols, |
| 107 | * struct symbol is also used for lists of unresolved symbols */ |
| 108 | |
| 109 | #define SYMBOL_HASH_SIZE 1024 |
| 110 | |
| 111 | struct symbol { |
| 112 | struct symbol *next; |
| 113 | struct module *module; |
| 114 | unsigned int crc; |
| 115 | int crc_valid; |
| 116 | unsigned int weak:1; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 117 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
| 118 | unsigned int kernel:1; /* 1 if symbol is from kernel |
| 119 | * (only for external modules) **/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | char name[0]; |
| 121 | }; |
| 122 | |
| 123 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; |
| 124 | |
| 125 | /* This is based on the hash agorithm from gdbm, via tdb */ |
| 126 | static inline unsigned int tdb_hash(const char *name) |
| 127 | { |
| 128 | unsigned value; /* Used to compute the hash value. */ |
| 129 | unsigned i; /* Used to cycle through random values. */ |
| 130 | |
| 131 | /* Set the initial value from the key size. */ |
| 132 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) |
| 133 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
| 134 | |
| 135 | return (1103515243 * value + 12345); |
| 136 | } |
| 137 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 138 | /** |
| 139 | * Allocate a new symbols for use in the hash of exported symbols or |
| 140 | * the list of unresolved symbols per module |
| 141 | **/ |
| 142 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, |
| 143 | struct symbol *next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
| 145 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); |
| 146 | |
| 147 | memset(s, 0, sizeof(*s)); |
| 148 | strcpy(s->name, name); |
| 149 | s->weak = weak; |
| 150 | s->next = next; |
| 151 | return s; |
| 152 | } |
| 153 | |
| 154 | /* For the hash of exported symbols */ |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 155 | static struct symbol *new_symbol(const char *name, struct module *module) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
| 157 | unsigned int hash; |
| 158 | struct symbol *new; |
| 159 | |
| 160 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; |
| 161 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); |
| 162 | new->module = module; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 163 | return new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 166 | static struct symbol *find_symbol(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
| 168 | struct symbol *s; |
| 169 | |
| 170 | /* For our purposes, .foo matches foo. PPC64 needs this. */ |
| 171 | if (name[0] == '.') |
| 172 | name++; |
| 173 | |
| 174 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { |
| 175 | if (strcmp(s->name, name) == 0) |
| 176 | return s; |
| 177 | } |
| 178 | return NULL; |
| 179 | } |
| 180 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 181 | /** |
| 182 | * Add an exported symbol - it may have already been added without a |
| 183 | * CRC, in this case just update the CRC |
| 184 | **/ |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 185 | static struct symbol *sym_add_exported(const char *name, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
| 187 | struct symbol *s = find_symbol(name); |
| 188 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 189 | if (!s) |
| 190 | s = new_symbol(name, mod); |
| 191 | |
| 192 | s->vmlinux = is_vmlinux(mod->name); |
| 193 | s->kernel = 0; |
| 194 | return s; |
| 195 | } |
| 196 | |
| 197 | static void sym_update_crc(const char *name, struct module *mod, |
| 198 | unsigned int crc) |
| 199 | { |
| 200 | struct symbol *s = find_symbol(name); |
| 201 | |
| 202 | if (!s) |
| 203 | s = new_symbol(name, mod); |
| 204 | s->crc = crc; |
| 205 | s->crc_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 208 | void *grab_file(const char *filename, unsigned long *size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
| 210 | struct stat st; |
| 211 | void *map; |
| 212 | int fd; |
| 213 | |
| 214 | fd = open(filename, O_RDONLY); |
| 215 | if (fd < 0 || fstat(fd, &st) != 0) |
| 216 | return NULL; |
| 217 | |
| 218 | *size = st.st_size; |
| 219 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| 220 | close(fd); |
| 221 | |
| 222 | if (map == MAP_FAILED) |
| 223 | return NULL; |
| 224 | return map; |
| 225 | } |
| 226 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 227 | /** |
| 228 | * Return a copy of the next line in a mmap'ed file. |
| 229 | * spaces in the beginning of the line is trimmed away. |
| 230 | * Return a pointer to a static buffer. |
| 231 | **/ |
| 232 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
| 234 | static char line[4096]; |
| 235 | int skip = 1; |
| 236 | size_t len = 0; |
| 237 | signed char *p = (signed char *)file + *pos; |
| 238 | char *s = line; |
| 239 | |
| 240 | for (; *pos < size ; (*pos)++) |
| 241 | { |
| 242 | if (skip && isspace(*p)) { |
| 243 | p++; |
| 244 | continue; |
| 245 | } |
| 246 | skip = 0; |
| 247 | if (*p != '\n' && (*pos < size)) { |
| 248 | len++; |
| 249 | *s++ = *p++; |
| 250 | if (len > 4095) |
| 251 | break; /* Too long, stop */ |
| 252 | } else { |
| 253 | /* End of string */ |
| 254 | *s = '\0'; |
| 255 | return line; |
| 256 | } |
| 257 | } |
| 258 | /* End of buffer */ |
| 259 | return NULL; |
| 260 | } |
| 261 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 262 | void release_file(void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | munmap(file, size); |
| 265 | } |
| 266 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 267 | static void parse_elf(struct elf_info *info, const char *filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | { |
| 269 | unsigned int i; |
| 270 | Elf_Ehdr *hdr = info->hdr; |
| 271 | Elf_Shdr *sechdrs; |
| 272 | Elf_Sym *sym; |
| 273 | |
| 274 | hdr = grab_file(filename, &info->size); |
| 275 | if (!hdr) { |
| 276 | perror(filename); |
| 277 | abort(); |
| 278 | } |
| 279 | info->hdr = hdr; |
| 280 | if (info->size < sizeof(*hdr)) |
| 281 | goto truncated; |
| 282 | |
| 283 | /* Fix endianness in ELF header */ |
| 284 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); |
| 285 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
| 286 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); |
| 287 | hdr->e_machine = TO_NATIVE(hdr->e_machine); |
| 288 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 289 | info->sechdrs = sechdrs; |
| 290 | |
| 291 | /* Fix endianness in section headers */ |
| 292 | for (i = 0; i < hdr->e_shnum; i++) { |
| 293 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); |
| 294 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); |
| 295 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); |
| 296 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); |
| 297 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
| 298 | } |
| 299 | /* Find symbol table. */ |
| 300 | for (i = 1; i < hdr->e_shnum; i++) { |
| 301 | const char *secstrings |
| 302 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 303 | |
| 304 | if (sechdrs[i].sh_offset > info->size) |
| 305 | goto truncated; |
| 306 | if (strcmp(secstrings+sechdrs[i].sh_name, ".modinfo") == 0) { |
| 307 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
| 308 | info->modinfo_len = sechdrs[i].sh_size; |
| 309 | } |
| 310 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
| 311 | continue; |
| 312 | |
| 313 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; |
| 314 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
| 315 | + sechdrs[i].sh_size; |
| 316 | info->strtab = (void *)hdr + |
| 317 | sechdrs[sechdrs[i].sh_link].sh_offset; |
| 318 | } |
| 319 | if (!info->symtab_start) { |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 320 | fatal("%s has no symtab?\n", filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | /* Fix endianness in symbols */ |
| 323 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { |
| 324 | sym->st_shndx = TO_NATIVE(sym->st_shndx); |
| 325 | sym->st_name = TO_NATIVE(sym->st_name); |
| 326 | sym->st_value = TO_NATIVE(sym->st_value); |
| 327 | sym->st_size = TO_NATIVE(sym->st_size); |
| 328 | } |
| 329 | return; |
| 330 | |
| 331 | truncated: |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 332 | fatal("%s is truncated.\n", filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 335 | static void parse_elf_finish(struct elf_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
| 337 | release_file(info->hdr, info->size); |
| 338 | } |
| 339 | |
Luke Yang | 9572b28 | 2005-12-21 10:27:23 +0800 | [diff] [blame] | 340 | #define CRC_PFX "__crc_" |
| 341 | #define KSYMTAB_PFX "__ksymtab_" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 343 | static void handle_modversions(struct module *mod, struct elf_info *info, |
| 344 | Elf_Sym *sym, const char *symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | { |
| 346 | unsigned int crc; |
| 347 | |
| 348 | switch (sym->st_shndx) { |
| 349 | case SHN_COMMON: |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 350 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | break; |
| 352 | case SHN_ABS: |
| 353 | /* CRC'd symbol */ |
| 354 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
| 355 | crc = (unsigned int) sym->st_value; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 356 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | break; |
| 359 | case SHN_UNDEF: |
| 360 | /* undefined symbol */ |
| 361 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && |
| 362 | ELF_ST_BIND(sym->st_info) != STB_WEAK) |
| 363 | break; |
| 364 | /* ignore global offset table */ |
| 365 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 366 | break; |
| 367 | /* ignore __this_module, it will be resolved shortly */ |
| 368 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) |
| 369 | break; |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 370 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
| 371 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) |
| 372 | /* add compatibility with older glibc */ |
| 373 | #ifndef STT_SPARC_REGISTER |
| 374 | #define STT_SPARC_REGISTER STT_REGISTER |
| 375 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (info->hdr->e_machine == EM_SPARC || |
| 377 | info->hdr->e_machine == EM_SPARCV9) { |
| 378 | /* Ignore register directives. */ |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 379 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | break; |
Al Viro | 7caaeab | 2005-09-11 20:14:07 -0700 | [diff] [blame] | 381 | if (symname[0] == '.') { |
| 382 | char *munged = strdup(symname); |
| 383 | munged[0] = '_'; |
| 384 | munged[1] = toupper(munged[1]); |
| 385 | symname = munged; |
| 386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | #endif |
| 389 | |
| 390 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
| 391 | strlen(MODULE_SYMBOL_PREFIX)) == 0) |
| 392 | mod->unres = alloc_symbol(symname + |
| 393 | strlen(MODULE_SYMBOL_PREFIX), |
| 394 | ELF_ST_BIND(sym->st_info) == STB_WEAK, |
| 395 | mod->unres); |
| 396 | break; |
| 397 | default: |
| 398 | /* All exported symbols */ |
| 399 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 400 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) |
| 403 | mod->has_init = 1; |
| 404 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) |
| 405 | mod->has_cleanup = 1; |
| 406 | break; |
| 407 | } |
| 408 | } |
| 409 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 410 | /** |
| 411 | * Parse tag=value strings from .modinfo section |
| 412 | **/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | static char *next_string(char *string, unsigned long *secsize) |
| 414 | { |
| 415 | /* Skip non-zero chars */ |
| 416 | while (string[0]) { |
| 417 | string++; |
| 418 | if ((*secsize)-- <= 1) |
| 419 | return NULL; |
| 420 | } |
| 421 | |
| 422 | /* Skip any zero padding. */ |
| 423 | while (!string[0]) { |
| 424 | string++; |
| 425 | if ((*secsize)-- <= 1) |
| 426 | return NULL; |
| 427 | } |
| 428 | return string; |
| 429 | } |
| 430 | |
| 431 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
| 432 | const char *tag) |
| 433 | { |
| 434 | char *p; |
| 435 | unsigned int taglen = strlen(tag); |
| 436 | unsigned long size = modinfo_len; |
| 437 | |
| 438 | for (p = modinfo; p; p = next_string(p, &size)) { |
| 439 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 440 | return p + taglen + 1; |
| 441 | } |
| 442 | return NULL; |
| 443 | } |
| 444 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 445 | static void read_symbols(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | { |
| 447 | const char *symname; |
| 448 | char *version; |
| 449 | struct module *mod; |
| 450 | struct elf_info info = { }; |
| 451 | Elf_Sym *sym; |
| 452 | |
| 453 | parse_elf(&info, modname); |
| 454 | |
| 455 | mod = new_module(modname); |
| 456 | |
| 457 | /* When there's no vmlinux, don't print warnings about |
| 458 | * unresolved symbols (since there'll be too many ;) */ |
| 459 | if (is_vmlinux(modname)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | have_vmlinux = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | mod->skip = 1; |
| 462 | } |
| 463 | |
| 464 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
| 465 | symname = info.strtab + sym->st_name; |
| 466 | |
| 467 | handle_modversions(mod, &info, sym, symname); |
| 468 | handle_moddevtable(mod, &info, sym, symname); |
| 469 | } |
| 470 | |
| 471 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); |
| 472 | if (version) |
| 473 | maybe_frob_rcs_version(modname, version, info.modinfo, |
| 474 | version - (char *)info.hdr); |
| 475 | if (version || (all_versions && !is_vmlinux(modname))) |
| 476 | get_src_version(modname, mod->srcversion, |
| 477 | sizeof(mod->srcversion)-1); |
| 478 | |
| 479 | parse_elf_finish(&info); |
| 480 | |
| 481 | /* Our trick to get versioning for struct_module - it's |
| 482 | * never passed as an argument to an exported function, so |
| 483 | * the automatic versioning doesn't pick it up, but it's really |
| 484 | * important anyhow */ |
| 485 | if (modversions) |
| 486 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); |
| 487 | } |
| 488 | |
| 489 | #define SZ 500 |
| 490 | |
| 491 | /* We first write the generated file into memory using the |
| 492 | * following helper, then compare to the file on disk and |
| 493 | * only update the later if anything changed */ |
| 494 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 495 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
| 496 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | { |
| 498 | char tmp[SZ]; |
| 499 | int len; |
| 500 | va_list ap; |
| 501 | |
| 502 | va_start(ap, fmt); |
| 503 | len = vsnprintf(tmp, SZ, fmt, ap); |
| 504 | if (buf->size - buf->pos < len + 1) { |
| 505 | buf->size += 128; |
| 506 | buf->p = realloc(buf->p, buf->size); |
| 507 | } |
| 508 | strncpy(buf->p + buf->pos, tmp, len + 1); |
| 509 | buf->pos += len; |
| 510 | va_end(ap); |
| 511 | } |
| 512 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 513 | void buf_write(struct buffer *buf, const char *s, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
| 515 | if (buf->size - buf->pos < len) { |
| 516 | buf->size += len; |
| 517 | buf->p = realloc(buf->p, buf->size); |
| 518 | } |
| 519 | strncpy(buf->p + buf->pos, s, len); |
| 520 | buf->pos += len; |
| 521 | } |
| 522 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 523 | /** |
| 524 | * Header for the generated file |
| 525 | **/ |
| 526 | static void add_header(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
| 528 | buf_printf(b, "#include <linux/module.h>\n"); |
| 529 | buf_printf(b, "#include <linux/vermagic.h>\n"); |
| 530 | buf_printf(b, "#include <linux/compiler.h>\n"); |
| 531 | buf_printf(b, "\n"); |
| 532 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); |
| 533 | buf_printf(b, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | buf_printf(b, "struct module __this_module\n"); |
| 535 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 536 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | if (mod->has_init) |
| 538 | buf_printf(b, " .init = init_module,\n"); |
| 539 | if (mod->has_cleanup) |
| 540 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" |
| 541 | " .exit = cleanup_module,\n" |
| 542 | "#endif\n"); |
| 543 | buf_printf(b, "};\n"); |
| 544 | } |
| 545 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 546 | /** |
| 547 | * Record CRCs for unresolved symbols |
| 548 | **/ |
| 549 | static void add_versions(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | { |
| 551 | struct symbol *s, *exp; |
| 552 | |
| 553 | for (s = mod->unres; s; s = s->next) { |
| 554 | exp = find_symbol(s->name); |
| 555 | if (!exp || exp->module == mod) { |
| 556 | if (have_vmlinux && !s->weak) |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 557 | warn("\"%s\" [%s.ko] undefined!\n", |
| 558 | s->name, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | continue; |
| 560 | } |
| 561 | s->module = exp->module; |
| 562 | s->crc_valid = exp->crc_valid; |
| 563 | s->crc = exp->crc; |
| 564 | } |
| 565 | |
| 566 | if (!modversions) |
| 567 | return; |
| 568 | |
| 569 | buf_printf(b, "\n"); |
| 570 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); |
| 571 | buf_printf(b, "__attribute_used__\n"); |
| 572 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
| 573 | |
| 574 | for (s = mod->unres; s; s = s->next) { |
| 575 | if (!s->module) { |
| 576 | continue; |
| 577 | } |
| 578 | if (!s->crc_valid) { |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 579 | warn("\"%s\" [%s.ko] has no CRC!\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | s->name, mod->name); |
| 581 | continue; |
| 582 | } |
| 583 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); |
| 584 | } |
| 585 | |
| 586 | buf_printf(b, "};\n"); |
| 587 | } |
| 588 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 589 | static void add_depends(struct buffer *b, struct module *mod, |
| 590 | struct module *modules) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | struct symbol *s; |
| 593 | struct module *m; |
| 594 | int first = 1; |
| 595 | |
| 596 | for (m = modules; m; m = m->next) { |
| 597 | m->seen = is_vmlinux(m->name); |
| 598 | } |
| 599 | |
| 600 | buf_printf(b, "\n"); |
| 601 | buf_printf(b, "static const char __module_depends[]\n"); |
| 602 | buf_printf(b, "__attribute_used__\n"); |
| 603 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
| 604 | buf_printf(b, "\"depends="); |
| 605 | for (s = mod->unres; s; s = s->next) { |
| 606 | if (!s->module) |
| 607 | continue; |
| 608 | |
| 609 | if (s->module->seen) |
| 610 | continue; |
| 611 | |
| 612 | s->module->seen = 1; |
| 613 | buf_printf(b, "%s%s", first ? "" : ",", |
| 614 | strrchr(s->module->name, '/') + 1); |
| 615 | first = 0; |
| 616 | } |
| 617 | buf_printf(b, "\";\n"); |
| 618 | } |
| 619 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 620 | static void add_srcversion(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
| 622 | if (mod->srcversion[0]) { |
| 623 | buf_printf(b, "\n"); |
| 624 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", |
| 625 | mod->srcversion); |
| 626 | } |
| 627 | } |
| 628 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 629 | static void write_if_changed(struct buffer *b, const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
| 631 | char *tmp; |
| 632 | FILE *file; |
| 633 | struct stat st; |
| 634 | |
| 635 | file = fopen(fname, "r"); |
| 636 | if (!file) |
| 637 | goto write; |
| 638 | |
| 639 | if (fstat(fileno(file), &st) < 0) |
| 640 | goto close_write; |
| 641 | |
| 642 | if (st.st_size != b->pos) |
| 643 | goto close_write; |
| 644 | |
| 645 | tmp = NOFAIL(malloc(b->pos)); |
| 646 | if (fread(tmp, 1, b->pos, file) != b->pos) |
| 647 | goto free_write; |
| 648 | |
| 649 | if (memcmp(tmp, b->p, b->pos) != 0) |
| 650 | goto free_write; |
| 651 | |
| 652 | free(tmp); |
| 653 | fclose(file); |
| 654 | return; |
| 655 | |
| 656 | free_write: |
| 657 | free(tmp); |
| 658 | close_write: |
| 659 | fclose(file); |
| 660 | write: |
| 661 | file = fopen(fname, "w"); |
| 662 | if (!file) { |
| 663 | perror(fname); |
| 664 | exit(1); |
| 665 | } |
| 666 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { |
| 667 | perror(fname); |
| 668 | exit(1); |
| 669 | } |
| 670 | fclose(file); |
| 671 | } |
| 672 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 673 | static void read_dump(const char *fname, unsigned int kernel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
| 675 | unsigned long size, pos = 0; |
| 676 | void *file = grab_file(fname, &size); |
| 677 | char *line; |
| 678 | |
| 679 | if (!file) |
| 680 | /* No symbol versions, silently ignore */ |
| 681 | return; |
| 682 | |
| 683 | while ((line = get_next_line(&pos, file, size))) { |
| 684 | char *symname, *modname, *d; |
| 685 | unsigned int crc; |
| 686 | struct module *mod; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 687 | struct symbol *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
| 689 | if (!(symname = strchr(line, '\t'))) |
| 690 | goto fail; |
| 691 | *symname++ = '\0'; |
| 692 | if (!(modname = strchr(symname, '\t'))) |
| 693 | goto fail; |
| 694 | *modname++ = '\0'; |
| 695 | if (strchr(modname, '\t')) |
| 696 | goto fail; |
| 697 | crc = strtoul(line, &d, 16); |
| 698 | if (*symname == '\0' || *modname == '\0' || *d != '\0') |
| 699 | goto fail; |
| 700 | |
| 701 | if (!(mod = find_module(modname))) { |
| 702 | if (is_vmlinux(modname)) { |
| 703 | have_vmlinux = 1; |
| 704 | } |
| 705 | mod = new_module(NOFAIL(strdup(modname))); |
| 706 | mod->skip = 1; |
| 707 | } |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 708 | s = sym_add_exported(symname, mod); |
| 709 | s->kernel = kernel; |
| 710 | sym_update_crc(symname, mod, crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } |
| 712 | return; |
| 713 | fail: |
| 714 | fatal("parse error in symbol dump file\n"); |
| 715 | } |
| 716 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 717 | /* For normal builds always dump all symbols. |
| 718 | * For external modules only dump symbols |
| 719 | * that are not read from kernel Module.symvers. |
| 720 | **/ |
| 721 | static int dump_sym(struct symbol *sym) |
| 722 | { |
| 723 | if (!external_module) |
| 724 | return 1; |
| 725 | if (sym->vmlinux || sym->kernel) |
| 726 | return 0; |
| 727 | return 1; |
| 728 | } |
| 729 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 730 | static void write_dump(const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | { |
| 732 | struct buffer buf = { }; |
| 733 | struct symbol *symbol; |
| 734 | int n; |
| 735 | |
| 736 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { |
| 737 | symbol = symbolhash[n]; |
| 738 | while (symbol) { |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 739 | if (dump_sym(symbol)) |
| 740 | buf_printf(&buf, "0x%08x\t%s\t%s\n", |
| 741 | symbol->crc, symbol->name, |
| 742 | symbol->module->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | symbol = symbol->next; |
| 744 | } |
| 745 | } |
| 746 | write_if_changed(&buf, fname); |
| 747 | } |
| 748 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 749 | int main(int argc, char **argv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | { |
| 751 | struct module *mod; |
| 752 | struct buffer buf = { }; |
| 753 | char fname[SZ]; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 754 | char *kernel_read = NULL, *module_read = NULL; |
| 755 | char *dump_write = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | int opt; |
| 757 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 758 | while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | switch(opt) { |
| 760 | case 'i': |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 761 | kernel_read = optarg; |
| 762 | break; |
| 763 | case 'I': |
| 764 | module_read = optarg; |
| 765 | external_module = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | break; |
| 767 | case 'm': |
| 768 | modversions = 1; |
| 769 | break; |
| 770 | case 'o': |
| 771 | dump_write = optarg; |
| 772 | break; |
| 773 | case 'a': |
| 774 | all_versions = 1; |
| 775 | break; |
| 776 | default: |
| 777 | exit(1); |
| 778 | } |
| 779 | } |
| 780 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame^] | 781 | if (kernel_read) |
| 782 | read_dump(kernel_read, 1); |
| 783 | if (module_read) |
| 784 | read_dump(module_read, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
| 786 | while (optind < argc) { |
| 787 | read_symbols(argv[optind++]); |
| 788 | } |
| 789 | |
| 790 | for (mod = modules; mod; mod = mod->next) { |
| 791 | if (mod->skip) |
| 792 | continue; |
| 793 | |
| 794 | buf.pos = 0; |
| 795 | |
| 796 | add_header(&buf, mod); |
| 797 | add_versions(&buf, mod); |
| 798 | add_depends(&buf, mod, modules); |
| 799 | add_moddevtable(&buf, mod); |
| 800 | add_srcversion(&buf, mod); |
| 801 | |
| 802 | sprintf(fname, "%s.mod.c", mod->name); |
| 803 | write_if_changed(&buf, fname); |
| 804 | } |
| 805 | |
| 806 | if (dump_write) |
| 807 | write_dump(dump_write); |
| 808 | |
| 809 | return 0; |
| 810 | } |