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 |
Sam Ravnborg | 382168f | 2006-02-26 20:11:17 +0100 | [diff] [blame] | 5 | * Copyright 2006 Sam Ravnborg |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 25 | /* How a symbol is exported */ |
| 26 | enum export {export_plain, export_gpl, export_gpl_future, export_unknown}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 28 | void fatal(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
| 30 | va_list arglist; |
| 31 | |
| 32 | fprintf(stderr, "FATAL: "); |
| 33 | |
| 34 | va_start(arglist, fmt); |
| 35 | vfprintf(stderr, fmt, arglist); |
| 36 | va_end(arglist); |
| 37 | |
| 38 | exit(1); |
| 39 | } |
| 40 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 41 | void warn(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
| 43 | va_list arglist; |
| 44 | |
| 45 | fprintf(stderr, "WARNING: "); |
| 46 | |
| 47 | va_start(arglist, fmt); |
| 48 | vfprintf(stderr, fmt, arglist); |
| 49 | va_end(arglist); |
| 50 | } |
| 51 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 52 | static int is_vmlinux(const char *modname) |
| 53 | { |
| 54 | const char *myname; |
| 55 | |
| 56 | if ((myname = strrchr(modname, '/'))) |
| 57 | myname++; |
| 58 | else |
| 59 | myname = modname; |
| 60 | |
| 61 | return strcmp(myname, "vmlinux") == 0; |
| 62 | } |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | void *do_nofail(void *ptr, const char *expr) |
| 65 | { |
| 66 | if (!ptr) { |
| 67 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
| 68 | } |
| 69 | return ptr; |
| 70 | } |
| 71 | |
| 72 | /* A list of all modules we processed */ |
| 73 | |
| 74 | static struct module *modules; |
| 75 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 76 | static struct module *find_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | struct module *mod; |
| 79 | |
| 80 | for (mod = modules; mod; mod = mod->next) |
| 81 | if (strcmp(mod->name, modname) == 0) |
| 82 | break; |
| 83 | return mod; |
| 84 | } |
| 85 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 86 | static struct module *new_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
| 88 | struct module *mod; |
| 89 | char *p, *s; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | mod = NOFAIL(malloc(sizeof(*mod))); |
| 92 | memset(mod, 0, sizeof(*mod)); |
| 93 | p = NOFAIL(strdup(modname)); |
| 94 | |
| 95 | /* strip trailing .o */ |
| 96 | if ((s = strrchr(p, '.')) != NULL) |
| 97 | if (strcmp(s, ".o") == 0) |
| 98 | *s = '\0'; |
| 99 | |
| 100 | /* add to list */ |
| 101 | mod->name = p; |
| 102 | mod->next = modules; |
| 103 | modules = mod; |
| 104 | |
| 105 | return mod; |
| 106 | } |
| 107 | |
| 108 | /* A hash of all exported symbols, |
| 109 | * struct symbol is also used for lists of unresolved symbols */ |
| 110 | |
| 111 | #define SYMBOL_HASH_SIZE 1024 |
| 112 | |
| 113 | struct symbol { |
| 114 | struct symbol *next; |
| 115 | struct module *module; |
| 116 | unsigned int crc; |
| 117 | int crc_valid; |
| 118 | unsigned int weak:1; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 119 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
| 120 | unsigned int kernel:1; /* 1 if symbol is from kernel |
| 121 | * (only for external modules) **/ |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 122 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 123 | enum export export; /* Type of export */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | char name[0]; |
| 125 | }; |
| 126 | |
| 127 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; |
| 128 | |
| 129 | /* This is based on the hash agorithm from gdbm, via tdb */ |
| 130 | static inline unsigned int tdb_hash(const char *name) |
| 131 | { |
| 132 | unsigned value; /* Used to compute the hash value. */ |
| 133 | unsigned i; /* Used to cycle through random values. */ |
| 134 | |
| 135 | /* Set the initial value from the key size. */ |
| 136 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) |
| 137 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
| 138 | |
| 139 | return (1103515243 * value + 12345); |
| 140 | } |
| 141 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 142 | /** |
| 143 | * Allocate a new symbols for use in the hash of exported symbols or |
| 144 | * the list of unresolved symbols per module |
| 145 | **/ |
| 146 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, |
| 147 | struct symbol *next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | { |
| 149 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); |
| 150 | |
| 151 | memset(s, 0, sizeof(*s)); |
| 152 | strcpy(s->name, name); |
| 153 | s->weak = weak; |
| 154 | s->next = next; |
| 155 | return s; |
| 156 | } |
| 157 | |
| 158 | /* For the hash of exported symbols */ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 159 | static struct symbol *new_symbol(const char *name, struct module *module, |
| 160 | enum export export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
| 162 | unsigned int hash; |
| 163 | struct symbol *new; |
| 164 | |
| 165 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; |
| 166 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); |
| 167 | new->module = module; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 168 | new->export = export; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 169 | return new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 172 | static struct symbol *find_symbol(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
| 174 | struct symbol *s; |
| 175 | |
| 176 | /* For our purposes, .foo matches foo. PPC64 needs this. */ |
| 177 | if (name[0] == '.') |
| 178 | name++; |
| 179 | |
| 180 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { |
| 181 | if (strcmp(s->name, name) == 0) |
| 182 | return s; |
| 183 | } |
| 184 | return NULL; |
| 185 | } |
| 186 | |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 187 | static struct { |
| 188 | const char *str; |
| 189 | enum export export; |
| 190 | } export_list[] = { |
| 191 | { .str = "EXPORT_SYMBOL", .export = export_plain }, |
| 192 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
| 193 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
| 194 | { .str = "(unknown)", .export = export_unknown }, |
| 195 | }; |
| 196 | |
| 197 | |
| 198 | static const char *export_str(enum export ex) |
| 199 | { |
| 200 | return export_list[ex].str; |
| 201 | } |
| 202 | |
| 203 | static enum export export_no(const char * s) |
| 204 | { |
| 205 | int i; |
| 206 | for (i = 0; export_list[i].export != export_unknown; i++) { |
| 207 | if (strcmp(export_list[i].str, s) == 0) |
| 208 | return export_list[i].export; |
| 209 | } |
| 210 | return export_unknown; |
| 211 | } |
| 212 | |
| 213 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) |
| 214 | { |
| 215 | if (sec == elf->export_sec) |
| 216 | return export_plain; |
| 217 | else if (sec == elf->export_gpl_sec) |
| 218 | return export_gpl; |
| 219 | else if (sec == elf->export_gpl_future_sec) |
| 220 | return export_gpl_future; |
| 221 | else |
| 222 | return export_unknown; |
| 223 | } |
| 224 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 225 | /** |
| 226 | * Add an exported symbol - it may have already been added without a |
| 227 | * CRC, in this case just update the CRC |
| 228 | **/ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 229 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
| 230 | enum export export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
| 232 | struct symbol *s = find_symbol(name); |
| 233 | |
| 234 | if (!s) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 235 | s = new_symbol(name, mod, export); |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 236 | } else { |
| 237 | if (!s->preloaded) { |
Sam Ravnborg | 7b75b13 | 2006-03-05 13:48:58 +0100 | [diff] [blame] | 238 | warn("%s: '%s' exported twice. Previous export " |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 239 | "was in %s%s\n", mod->name, name, |
| 240 | s->module->name, |
| 241 | is_vmlinux(s->module->name) ?"":".ko"); |
| 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 244 | s->preloaded = 0; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 245 | s->vmlinux = is_vmlinux(mod->name); |
| 246 | s->kernel = 0; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 247 | s->export = export; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 248 | return s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 251 | static void sym_update_crc(const char *name, struct module *mod, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 252 | unsigned int crc, enum export export) |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 253 | { |
| 254 | struct symbol *s = find_symbol(name); |
| 255 | |
| 256 | if (!s) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 257 | s = new_symbol(name, mod, export); |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 258 | s->crc = crc; |
| 259 | s->crc_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 262 | void *grab_file(const char *filename, unsigned long *size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | struct stat st; |
| 265 | void *map; |
| 266 | int fd; |
| 267 | |
| 268 | fd = open(filename, O_RDONLY); |
| 269 | if (fd < 0 || fstat(fd, &st) != 0) |
| 270 | return NULL; |
| 271 | |
| 272 | *size = st.st_size; |
| 273 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| 274 | close(fd); |
| 275 | |
| 276 | if (map == MAP_FAILED) |
| 277 | return NULL; |
| 278 | return map; |
| 279 | } |
| 280 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 281 | /** |
| 282 | * Return a copy of the next line in a mmap'ed file. |
| 283 | * spaces in the beginning of the line is trimmed away. |
| 284 | * Return a pointer to a static buffer. |
| 285 | **/ |
| 286 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
| 288 | static char line[4096]; |
| 289 | int skip = 1; |
| 290 | size_t len = 0; |
| 291 | signed char *p = (signed char *)file + *pos; |
| 292 | char *s = line; |
| 293 | |
| 294 | for (; *pos < size ; (*pos)++) |
| 295 | { |
| 296 | if (skip && isspace(*p)) { |
| 297 | p++; |
| 298 | continue; |
| 299 | } |
| 300 | skip = 0; |
| 301 | if (*p != '\n' && (*pos < size)) { |
| 302 | len++; |
| 303 | *s++ = *p++; |
| 304 | if (len > 4095) |
| 305 | break; /* Too long, stop */ |
| 306 | } else { |
| 307 | /* End of string */ |
| 308 | *s = '\0'; |
| 309 | return line; |
| 310 | } |
| 311 | } |
| 312 | /* End of buffer */ |
| 313 | return NULL; |
| 314 | } |
| 315 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 316 | void release_file(void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
| 318 | munmap(file, size); |
| 319 | } |
| 320 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 321 | static void parse_elf(struct elf_info *info, const char *filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
| 323 | unsigned int i; |
| 324 | Elf_Ehdr *hdr = info->hdr; |
| 325 | Elf_Shdr *sechdrs; |
| 326 | Elf_Sym *sym; |
| 327 | |
| 328 | hdr = grab_file(filename, &info->size); |
| 329 | if (!hdr) { |
| 330 | perror(filename); |
| 331 | abort(); |
| 332 | } |
| 333 | info->hdr = hdr; |
| 334 | if (info->size < sizeof(*hdr)) |
| 335 | goto truncated; |
| 336 | |
| 337 | /* Fix endianness in ELF header */ |
| 338 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); |
| 339 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
| 340 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); |
| 341 | hdr->e_machine = TO_NATIVE(hdr->e_machine); |
| 342 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 343 | info->sechdrs = sechdrs; |
| 344 | |
| 345 | /* Fix endianness in section headers */ |
| 346 | for (i = 0; i < hdr->e_shnum; i++) { |
| 347 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); |
| 348 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); |
| 349 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); |
| 350 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); |
| 351 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
| 352 | } |
| 353 | /* Find symbol table. */ |
| 354 | for (i = 1; i < hdr->e_shnum; i++) { |
| 355 | const char *secstrings |
| 356 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 357 | const char *secname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | if (sechdrs[i].sh_offset > info->size) |
| 360 | goto truncated; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 361 | secname = secstrings + sechdrs[i].sh_name; |
| 362 | if (strcmp(secname, ".modinfo") == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
| 364 | info->modinfo_len = sechdrs[i].sh_size; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 365 | } else if (strcmp(secname, "__ksymtab") == 0) |
| 366 | info->export_sec = i; |
| 367 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
| 368 | info->export_gpl_sec = i; |
| 369 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
| 370 | info->export_gpl_future_sec = i; |
| 371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
| 373 | continue; |
| 374 | |
| 375 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 376 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | + sechdrs[i].sh_size; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 378 | info->strtab = (void *)hdr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | sechdrs[sechdrs[i].sh_link].sh_offset; |
| 380 | } |
| 381 | if (!info->symtab_start) { |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 382 | fatal("%s has no symtab?\n", filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | /* Fix endianness in symbols */ |
| 385 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { |
| 386 | sym->st_shndx = TO_NATIVE(sym->st_shndx); |
| 387 | sym->st_name = TO_NATIVE(sym->st_name); |
| 388 | sym->st_value = TO_NATIVE(sym->st_value); |
| 389 | sym->st_size = TO_NATIVE(sym->st_size); |
| 390 | } |
| 391 | return; |
| 392 | |
| 393 | truncated: |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 394 | fatal("%s is truncated.\n", filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 397 | static void parse_elf_finish(struct elf_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | { |
| 399 | release_file(info->hdr, info->size); |
| 400 | } |
| 401 | |
Luke Yang | f7b05e6 | 2006-03-02 18:35:31 +0800 | [diff] [blame] | 402 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
| 403 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 405 | static void handle_modversions(struct module *mod, struct elf_info *info, |
| 406 | Elf_Sym *sym, const char *symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
| 408 | unsigned int crc; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 409 | enum export export = export_from_sec(info, sym->st_shndx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | switch (sym->st_shndx) { |
| 412 | case SHN_COMMON: |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 413 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | break; |
| 415 | case SHN_ABS: |
| 416 | /* CRC'd symbol */ |
| 417 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
| 418 | crc = (unsigned int) sym->st_value; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 419 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
| 420 | export); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | break; |
| 423 | case SHN_UNDEF: |
| 424 | /* undefined symbol */ |
| 425 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && |
| 426 | ELF_ST_BIND(sym->st_info) != STB_WEAK) |
| 427 | break; |
| 428 | /* ignore global offset table */ |
| 429 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 430 | break; |
| 431 | /* ignore __this_module, it will be resolved shortly */ |
| 432 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) |
| 433 | break; |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 434 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
| 435 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) |
| 436 | /* add compatibility with older glibc */ |
| 437 | #ifndef STT_SPARC_REGISTER |
| 438 | #define STT_SPARC_REGISTER STT_REGISTER |
| 439 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if (info->hdr->e_machine == EM_SPARC || |
| 441 | info->hdr->e_machine == EM_SPARCV9) { |
| 442 | /* Ignore register directives. */ |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 443 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | break; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 445 | if (symname[0] == '.') { |
| 446 | char *munged = strdup(symname); |
| 447 | munged[0] = '_'; |
| 448 | munged[1] = toupper(munged[1]); |
| 449 | symname = munged; |
| 450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | #endif |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
| 455 | strlen(MODULE_SYMBOL_PREFIX)) == 0) |
| 456 | mod->unres = alloc_symbol(symname + |
| 457 | strlen(MODULE_SYMBOL_PREFIX), |
| 458 | ELF_ST_BIND(sym->st_info) == STB_WEAK, |
| 459 | mod->unres); |
| 460 | break; |
| 461 | default: |
| 462 | /* All exported symbols */ |
| 463 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 464 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
| 465 | export); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) |
| 468 | mod->has_init = 1; |
| 469 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) |
| 470 | mod->has_cleanup = 1; |
| 471 | break; |
| 472 | } |
| 473 | } |
| 474 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 475 | /** |
| 476 | * Parse tag=value strings from .modinfo section |
| 477 | **/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | static char *next_string(char *string, unsigned long *secsize) |
| 479 | { |
| 480 | /* Skip non-zero chars */ |
| 481 | while (string[0]) { |
| 482 | string++; |
| 483 | if ((*secsize)-- <= 1) |
| 484 | return NULL; |
| 485 | } |
| 486 | |
| 487 | /* Skip any zero padding. */ |
| 488 | while (!string[0]) { |
| 489 | string++; |
| 490 | if ((*secsize)-- <= 1) |
| 491 | return NULL; |
| 492 | } |
| 493 | return string; |
| 494 | } |
| 495 | |
| 496 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
| 497 | const char *tag) |
| 498 | { |
| 499 | char *p; |
| 500 | unsigned int taglen = strlen(tag); |
| 501 | unsigned long size = modinfo_len; |
| 502 | |
| 503 | for (p = modinfo; p; p = next_string(p, &size)) { |
| 504 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 505 | return p + taglen + 1; |
| 506 | } |
| 507 | return NULL; |
| 508 | } |
| 509 | |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 510 | /** |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 511 | * Test if string s ends in string sub |
| 512 | * return 0 if match |
| 513 | **/ |
| 514 | static int strrcmp(const char *s, const char *sub) |
| 515 | { |
| 516 | int slen, sublen; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 517 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 518 | if (!s || !sub) |
| 519 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 520 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 521 | slen = strlen(s); |
| 522 | sublen = strlen(sub); |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 523 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 524 | if ((slen == 0) || (sublen == 0)) |
| 525 | return 1; |
| 526 | |
| 527 | if (sublen > slen) |
| 528 | return 1; |
| 529 | |
| 530 | return memcmp(s + slen - sublen, sub, sublen); |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * Whitelist to allow certain references to pass with no warning. |
| 535 | * Pattern 1: |
| 536 | * If a module parameter is declared __initdata and permissions=0 |
| 537 | * then this is legal despite the warning generated. |
| 538 | * We cannot see value of permissions here, so just ignore |
| 539 | * this pattern. |
| 540 | * The pattern is identified by: |
| 541 | * tosec = .init.data |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 542 | * fromsec = .data* |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 543 | * atsym =__param* |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 544 | * |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 545 | * Pattern 2: |
Randy Dunlap | 72ee59b | 2006-04-15 11:17:12 -0700 | [diff] [blame] | 546 | * Many drivers utilise a *driver container with references to |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 547 | * add, remove, probe functions etc. |
| 548 | * These functions may often be marked __init and we do not want to |
| 549 | * warn here. |
| 550 | * the pattern is identified by: |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 551 | * tosec = .init.text | .exit.text | .init.data |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 552 | * fromsec = .data |
Randy Dunlap | 72ee59b | 2006-04-15 11:17:12 -0700 | [diff] [blame] | 553 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 554 | **/ |
| 555 | static int secref_whitelist(const char *tosec, const char *fromsec, |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 556 | const char *atsym) |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 557 | { |
| 558 | int f1 = 1, f2 = 1; |
| 559 | const char **s; |
| 560 | const char *pat2sym[] = { |
Randy Dunlap | 72ee59b | 2006-04-15 11:17:12 -0700 | [diff] [blame] | 561 | "driver", |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 562 | "_template", /* scsi uses *_template a lot */ |
| 563 | "_sht", /* scsi also used *_sht to some extent */ |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 564 | "_ops", |
| 565 | "_probe", |
| 566 | "_probe_one", |
| 567 | NULL |
| 568 | }; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 569 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 570 | /* Check for pattern 1 */ |
| 571 | if (strcmp(tosec, ".init.data") != 0) |
| 572 | f1 = 0; |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 573 | if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 574 | f1 = 0; |
| 575 | if (strncmp(atsym, "__param", strlen("__param")) != 0) |
| 576 | f1 = 0; |
| 577 | |
| 578 | if (f1) |
| 579 | return f1; |
| 580 | |
| 581 | /* Check for pattern 2 */ |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 582 | if ((strcmp(tosec, ".init.text") != 0) && |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 583 | (strcmp(tosec, ".exit.text") != 0) && |
| 584 | (strcmp(tosec, ".init.data") != 0)) |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 585 | f2 = 0; |
| 586 | if (strcmp(fromsec, ".data") != 0) |
| 587 | f2 = 0; |
| 588 | |
| 589 | for (s = pat2sym; *s; s++) |
| 590 | if (strrcmp(atsym, *s) == 0) |
| 591 | f1 = 1; |
| 592 | |
| 593 | return f1 && f2; |
| 594 | } |
| 595 | |
| 596 | /** |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 597 | * Find symbol based on relocation record info. |
| 598 | * In some cases the symbol supplied is a valid symbol so |
| 599 | * return refsym. If st_name != 0 we assume this is a valid symbol. |
| 600 | * In other cases the symbol needs to be looked up in the symbol table |
| 601 | * based on section and address. |
| 602 | * **/ |
| 603 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, |
| 604 | Elf_Sym *relsym) |
| 605 | { |
| 606 | Elf_Sym *sym; |
| 607 | |
| 608 | if (relsym->st_name != 0) |
| 609 | return relsym; |
| 610 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
| 611 | if (sym->st_shndx != relsym->st_shndx) |
| 612 | continue; |
| 613 | if (sym->st_value == addr) |
| 614 | return sym; |
| 615 | } |
| 616 | return NULL; |
| 617 | } |
| 618 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 619 | /* |
Sam Ravnborg | 43c74d1 | 2006-03-05 12:02:46 +0100 | [diff] [blame] | 620 | * Find symbols before or equal addr and after addr - in the section sec. |
| 621 | * If we find two symbols with equal offset prefer one with a valid name. |
| 622 | * The ELF format may have a better way to detect what type of symbol |
| 623 | * it is, but this works for now. |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 624 | **/ |
| 625 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, |
| 626 | const char *sec, |
| 627 | Elf_Sym **before, Elf_Sym **after) |
| 628 | { |
| 629 | Elf_Sym *sym; |
| 630 | Elf_Ehdr *hdr = elf->hdr; |
| 631 | Elf_Addr beforediff = ~0; |
| 632 | Elf_Addr afterdiff = ~0; |
| 633 | const char *secstrings = (void *)hdr + |
| 634 | elf->sechdrs[hdr->e_shstrndx].sh_offset; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 635 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 636 | *before = NULL; |
| 637 | *after = NULL; |
| 638 | |
| 639 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
| 640 | const char *symsec; |
| 641 | |
| 642 | if (sym->st_shndx >= SHN_LORESERVE) |
| 643 | continue; |
| 644 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; |
| 645 | if (strcmp(symsec, sec) != 0) |
| 646 | continue; |
| 647 | if (sym->st_value <= addr) { |
| 648 | if ((addr - sym->st_value) < beforediff) { |
| 649 | beforediff = addr - sym->st_value; |
| 650 | *before = sym; |
| 651 | } |
Sam Ravnborg | 43c74d1 | 2006-03-05 12:02:46 +0100 | [diff] [blame] | 652 | else if ((addr - sym->st_value) == beforediff) { |
| 653 | /* equal offset, valid name? */ |
| 654 | const char *name = elf->strtab + sym->st_name; |
| 655 | if (name && strlen(name)) |
| 656 | *before = sym; |
| 657 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 658 | } |
| 659 | else |
| 660 | { |
| 661 | if ((sym->st_value - addr) < afterdiff) { |
| 662 | afterdiff = sym->st_value - addr; |
| 663 | *after = sym; |
| 664 | } |
Sam Ravnborg | 43c74d1 | 2006-03-05 12:02:46 +0100 | [diff] [blame] | 665 | else if ((sym->st_value - addr) == afterdiff) { |
| 666 | /* equal offset, valid name? */ |
| 667 | const char *name = elf->strtab + sym->st_name; |
| 668 | if (name && strlen(name)) |
| 669 | *after = sym; |
| 670 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 671 | } |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * Print a warning about a section mismatch. |
| 677 | * Try to find symbols near it so user can find it. |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 678 | * Check whitelist before warning - it may be a false positive. |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 679 | **/ |
| 680 | static void warn_sec_mismatch(const char *modname, const char *fromsec, |
| 681 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) |
| 682 | { |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 683 | const char *refsymname = ""; |
| 684 | Elf_Sym *before, *after; |
| 685 | Elf_Sym *refsym; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 686 | Elf_Ehdr *hdr = elf->hdr; |
| 687 | Elf_Shdr *sechdrs = elf->sechdrs; |
| 688 | const char *secstrings = (void *)hdr + |
| 689 | sechdrs[hdr->e_shstrndx].sh_offset; |
| 690 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 691 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 692 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
| 693 | |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 694 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
| 695 | if (refsym && strlen(elf->strtab + refsym->st_name)) |
| 696 | refsymname = elf->strtab + refsym->st_name; |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 697 | |
| 698 | /* check whitelist - we may ignore it */ |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 699 | if (before && |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 700 | secref_whitelist(secname, fromsec, elf->strtab + before->st_name)) |
| 701 | return; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 702 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 703 | if (before && after) { |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 704 | warn("%s - Section mismatch: reference to %s:%s from %s " |
| 705 | "between '%s' (at offset 0x%llx) and '%s'\n", |
| 706 | modname, secname, refsymname, fromsec, |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 707 | elf->strtab + before->st_name, |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 708 | (long long)r.r_offset, |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 709 | elf->strtab + after->st_name); |
| 710 | } else if (before) { |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 711 | warn("%s - Section mismatch: reference to %s:%s from %s " |
| 712 | "after '%s' (at offset 0x%llx)\n", |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 713 | modname, secname, refsymname, fromsec, |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 714 | elf->strtab + before->st_name, |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 715 | (long long)r.r_offset); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 716 | } else if (after) { |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 717 | warn("%s - Section mismatch: reference to %s:%s from %s " |
| 718 | "before '%s' (at offset -0x%llx)\n", |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 719 | modname, secname, refsymname, fromsec, |
Eric Sesterhenn | eaaae38 | 2006-04-11 00:54:16 +0200 | [diff] [blame] | 720 | elf->strtab + after->st_name, |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 721 | (long long)r.r_offset); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 722 | } else { |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 723 | warn("%s - Section mismatch: reference to %s:%s from %s " |
| 724 | "(offset 0x%llx)\n", |
| 725 | modname, secname, fromsec, refsymname, |
| 726 | (long long)r.r_offset); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 727 | } |
| 728 | } |
| 729 | |
| 730 | /** |
| 731 | * A module includes a number of sections that are discarded |
| 732 | * either when loaded or when used as built-in. |
| 733 | * For loaded modules all functions marked __init and all data |
| 734 | * marked __initdata will be discarded when the module has been intialized. |
| 735 | * Likewise for modules used built-in the sections marked __exit |
| 736 | * are discarded because __exit marked function are supposed to be called |
| 737 | * only when a moduel is unloaded which never happes for built-in modules. |
| 738 | * The check_sec_ref() function traverses all relocation records |
| 739 | * to find all references to a section that reference a section that will |
| 740 | * be discarded and warns about it. |
| 741 | **/ |
| 742 | static void check_sec_ref(struct module *mod, const char *modname, |
| 743 | struct elf_info *elf, |
| 744 | int section(const char*), |
| 745 | int section_ref_ok(const char *)) |
| 746 | { |
| 747 | int i; |
| 748 | Elf_Sym *sym; |
| 749 | Elf_Ehdr *hdr = elf->hdr; |
| 750 | Elf_Shdr *sechdrs = elf->sechdrs; |
| 751 | const char *secstrings = (void *)hdr + |
| 752 | sechdrs[hdr->e_shstrndx].sh_offset; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 753 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 754 | /* Walk through all sections */ |
| 755 | for (i = 0; i < hdr->e_shnum; i++) { |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 756 | const char *name = secstrings + sechdrs[i].sh_name; |
| 757 | const char *secname; |
| 758 | Elf_Rela r; |
Atsushi Nemoto | eae07ac | 2006-05-20 15:00:28 -0700 | [diff] [blame] | 759 | unsigned int r_sym; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 760 | /* We want to process only relocation sections and not .init */ |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 761 | if (sechdrs[i].sh_type == SHT_RELA) { |
| 762 | Elf_Rela *rela; |
| 763 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; |
| 764 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; |
| 765 | name += strlen(".rela"); |
| 766 | if (section_ref_ok(name)) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 767 | continue; |
| 768 | |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 769 | for (rela = start; rela < stop; rela++) { |
| 770 | r.r_offset = TO_NATIVE(rela->r_offset); |
Atsushi Nemoto | eae07ac | 2006-05-20 15:00:28 -0700 | [diff] [blame] | 771 | #if KERNEL_ELFCLASS == ELFCLASS64 |
| 772 | if (hdr->e_machine == EM_MIPS) { |
| 773 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
| 774 | r_sym = TO_NATIVE(r_sym); |
| 775 | } else { |
| 776 | r.r_info = TO_NATIVE(rela->r_info); |
| 777 | r_sym = ELF_R_SYM(r.r_info); |
| 778 | } |
| 779 | #else |
| 780 | r.r_info = TO_NATIVE(rela->r_info); |
| 781 | r_sym = ELF_R_SYM(r.r_info); |
| 782 | #endif |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 783 | r.r_addend = TO_NATIVE(rela->r_addend); |
Atsushi Nemoto | eae07ac | 2006-05-20 15:00:28 -0700 | [diff] [blame] | 784 | sym = elf->symtab_start + r_sym; |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 785 | /* Skip special sections */ |
| 786 | if (sym->st_shndx >= SHN_LORESERVE) |
| 787 | continue; |
| 788 | |
| 789 | secname = secstrings + |
| 790 | sechdrs[sym->st_shndx].sh_name; |
| 791 | if (section(secname)) |
| 792 | warn_sec_mismatch(modname, name, |
| 793 | elf, sym, r); |
| 794 | } |
| 795 | } else if (sechdrs[i].sh_type == SHT_REL) { |
| 796 | Elf_Rel *rel; |
| 797 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; |
| 798 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; |
| 799 | name += strlen(".rel"); |
| 800 | if (section_ref_ok(name)) |
| 801 | continue; |
| 802 | |
| 803 | for (rel = start; rel < stop; rel++) { |
| 804 | r.r_offset = TO_NATIVE(rel->r_offset); |
Atsushi Nemoto | eae07ac | 2006-05-20 15:00:28 -0700 | [diff] [blame] | 805 | #if KERNEL_ELFCLASS == ELFCLASS64 |
| 806 | if (hdr->e_machine == EM_MIPS) { |
| 807 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
| 808 | r_sym = TO_NATIVE(r_sym); |
| 809 | } else { |
| 810 | r.r_info = TO_NATIVE(rel->r_info); |
| 811 | r_sym = ELF_R_SYM(r.r_info); |
| 812 | } |
| 813 | #else |
| 814 | r.r_info = TO_NATIVE(rel->r_info); |
| 815 | r_sym = ELF_R_SYM(r.r_info); |
| 816 | #endif |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 817 | r.r_addend = 0; |
Atsushi Nemoto | eae07ac | 2006-05-20 15:00:28 -0700 | [diff] [blame] | 818 | sym = elf->symtab_start + r_sym; |
Atsushi Nemoto | 2c1a51f | 2006-05-20 15:00:26 -0700 | [diff] [blame] | 819 | /* Skip special sections */ |
| 820 | if (sym->st_shndx >= SHN_LORESERVE) |
| 821 | continue; |
| 822 | |
| 823 | secname = secstrings + |
| 824 | sechdrs[sym->st_shndx].sh_name; |
| 825 | if (section(secname)) |
| 826 | warn_sec_mismatch(modname, name, |
| 827 | elf, sym, r); |
| 828 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 829 | } |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | /** |
| 834 | * Functions used only during module init is marked __init and is stored in |
| 835 | * a .init.text section. Likewise data is marked __initdata and stored in |
| 836 | * a .init.data section. |
| 837 | * If this section is one of these sections return 1 |
| 838 | * See include/linux/init.h for the details |
| 839 | **/ |
| 840 | static int init_section(const char *name) |
| 841 | { |
| 842 | if (strcmp(name, ".init") == 0) |
| 843 | return 1; |
| 844 | if (strncmp(name, ".init.", strlen(".init.")) == 0) |
| 845 | return 1; |
| 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * Identify sections from which references to a .init section is OK. |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 851 | * |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 852 | * Unfortunately references to read only data that referenced .init |
| 853 | * sections had to be excluded. Almost all of these are false |
| 854 | * positives, they are created by gcc. The downside of excluding rodata |
| 855 | * is that there really are some user references from rodata to |
| 856 | * init code, e.g. drivers/video/vgacon.c: |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 857 | * |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 858 | * const struct consw vga_con = { |
| 859 | * con_startup: vgacon_startup, |
| 860 | * |
| 861 | * where vgacon_startup is __init. If you want to wade through the false |
| 862 | * positives, take out the check for rodata. |
| 863 | **/ |
| 864 | static int init_section_ref_ok(const char *name) |
| 865 | { |
| 866 | const char **s; |
| 867 | /* Absolute section names */ |
| 868 | const char *namelist1[] = { |
| 869 | ".init", |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 870 | ".opd", /* see comment [OPD] at exit_section_ref_ok() */ |
| 871 | ".toc1", /* used by ppc64 */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 872 | ".stab", |
| 873 | ".rodata", |
| 874 | ".text.lock", |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 875 | "__bug_table", /* used by powerpc for BUG() */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 876 | ".pci_fixup_header", |
| 877 | ".pci_fixup_final", |
| 878 | ".pdr", |
| 879 | "__param", |
Randy Dunlap | 35899c5 | 2006-06-07 16:23:26 -0700 | [diff] [blame] | 880 | ".smp_locks", |
Sam Ravnborg | 909252d | 2006-06-08 20:37:30 +0200 | [diff] [blame] | 881 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 882 | NULL |
| 883 | }; |
| 884 | /* Start of section names */ |
| 885 | const char *namelist2[] = { |
| 886 | ".init.", |
| 887 | ".altinstructions", |
| 888 | ".eh_frame", |
| 889 | ".debug", |
| 890 | NULL |
| 891 | }; |
Sam Ravnborg | 6e10133 | 2006-02-22 21:24:50 +0100 | [diff] [blame] | 892 | /* part of section name */ |
| 893 | const char *namelist3 [] = { |
| 894 | ".unwind", /* sample: IA_64.unwind.init.text */ |
| 895 | NULL |
| 896 | }; |
| 897 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 898 | for (s = namelist1; *s; s++) |
| 899 | if (strcmp(*s, name) == 0) |
| 900 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 901 | for (s = namelist2; *s; s++) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 902 | if (strncmp(*s, name, strlen(*s)) == 0) |
| 903 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 904 | for (s = namelist3; *s; s++) |
Sam Ravnborg | e835a39 | 2006-03-05 11:34:15 +0100 | [diff] [blame] | 905 | if (strstr(name, *s) != NULL) |
Sam Ravnborg | 6e10133 | 2006-02-22 21:24:50 +0100 | [diff] [blame] | 906 | return 1; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Functions used only during module exit is marked __exit and is stored in |
| 912 | * a .exit.text section. Likewise data is marked __exitdata and stored in |
| 913 | * a .exit.data section. |
| 914 | * If this section is one of these sections return 1 |
| 915 | * See include/linux/init.h for the details |
| 916 | **/ |
| 917 | static int exit_section(const char *name) |
| 918 | { |
| 919 | if (strcmp(name, ".exit.text") == 0) |
| 920 | return 1; |
| 921 | if (strcmp(name, ".exit.data") == 0) |
| 922 | return 1; |
| 923 | return 0; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 924 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 925 | } |
| 926 | |
| 927 | /* |
| 928 | * Identify sections from which references to a .exit section is OK. |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 929 | * |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 930 | * [OPD] Keith Ownes <kaos@sgi.com> commented: |
| 931 | * For our future {in}sanity, add a comment that this is the ppc .opd |
| 932 | * section, not the ia64 .opd section. |
| 933 | * ia64 .opd should not point to discarded sections. |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 934 | * [.rodata] like for .init.text we ignore .rodata references -same reason |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 935 | **/ |
| 936 | static int exit_section_ref_ok(const char *name) |
| 937 | { |
| 938 | const char **s; |
| 939 | /* Absolute section names */ |
| 940 | const char *namelist1[] = { |
| 941 | ".exit.text", |
| 942 | ".exit.data", |
| 943 | ".init.text", |
Sam Ravnborg | 5ecdd0f | 2006-04-14 23:54:13 +0200 | [diff] [blame] | 944 | ".rodata", |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 945 | ".opd", /* See comment [OPD] */ |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 946 | ".toc1", /* used by ppc64 */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 947 | ".altinstructions", |
| 948 | ".pdr", |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 949 | "__bug_table", /* used by powerpc for BUG() */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 950 | ".exitcall.exit", |
| 951 | ".eh_frame", |
| 952 | ".stab", |
Randy Dunlap | 35899c5 | 2006-06-07 16:23:26 -0700 | [diff] [blame] | 953 | ".smp_locks", |
Sam Ravnborg | 909252d | 2006-06-08 20:37:30 +0200 | [diff] [blame] | 954 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 955 | NULL |
| 956 | }; |
| 957 | /* Start of section names */ |
| 958 | const char *namelist2[] = { |
| 959 | ".debug", |
| 960 | NULL |
| 961 | }; |
Sam Ravnborg | 6e10133 | 2006-02-22 21:24:50 +0100 | [diff] [blame] | 962 | /* part of section name */ |
| 963 | const char *namelist3 [] = { |
| 964 | ".unwind", /* Sample: IA_64.unwind.exit.text */ |
| 965 | NULL |
| 966 | }; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 967 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 968 | for (s = namelist1; *s; s++) |
| 969 | if (strcmp(*s, name) == 0) |
| 970 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 971 | for (s = namelist2; *s; s++) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 972 | if (strncmp(*s, name, strlen(*s)) == 0) |
| 973 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 974 | for (s = namelist3; *s; s++) |
Sam Ravnborg | e835a39 | 2006-03-05 11:34:15 +0100 | [diff] [blame] | 975 | if (strstr(name, *s) != NULL) |
Sam Ravnborg | 6e10133 | 2006-02-22 21:24:50 +0100 | [diff] [blame] | 976 | return 1; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 977 | return 0; |
| 978 | } |
| 979 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 980 | static void read_symbols(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | { |
| 982 | const char *symname; |
| 983 | char *version; |
| 984 | struct module *mod; |
| 985 | struct elf_info info = { }; |
| 986 | Elf_Sym *sym; |
| 987 | |
| 988 | parse_elf(&info, modname); |
| 989 | |
| 990 | mod = new_module(modname); |
| 991 | |
| 992 | /* When there's no vmlinux, don't print warnings about |
| 993 | * unresolved symbols (since there'll be too many ;) */ |
| 994 | if (is_vmlinux(modname)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | have_vmlinux = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | mod->skip = 1; |
| 997 | } |
| 998 | |
| 999 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
| 1000 | symname = info.strtab + sym->st_name; |
| 1001 | |
| 1002 | handle_modversions(mod, &info, sym, symname); |
| 1003 | handle_moddevtable(mod, &info, sym, symname); |
| 1004 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1005 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
| 1006 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
| 1008 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); |
| 1009 | if (version) |
| 1010 | maybe_frob_rcs_version(modname, version, info.modinfo, |
| 1011 | version - (char *)info.hdr); |
| 1012 | if (version || (all_versions && !is_vmlinux(modname))) |
| 1013 | get_src_version(modname, mod->srcversion, |
| 1014 | sizeof(mod->srcversion)-1); |
| 1015 | |
| 1016 | parse_elf_finish(&info); |
| 1017 | |
| 1018 | /* Our trick to get versioning for struct_module - it's |
| 1019 | * never passed as an argument to an exported function, so |
| 1020 | * the automatic versioning doesn't pick it up, but it's really |
| 1021 | * important anyhow */ |
| 1022 | if (modversions) |
| 1023 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); |
| 1024 | } |
| 1025 | |
| 1026 | #define SZ 500 |
| 1027 | |
| 1028 | /* We first write the generated file into memory using the |
| 1029 | * following helper, then compare to the file on disk and |
| 1030 | * only update the later if anything changed */ |
| 1031 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1032 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
| 1033 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | { |
| 1035 | char tmp[SZ]; |
| 1036 | int len; |
| 1037 | va_list ap; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | va_start(ap, fmt); |
| 1040 | len = vsnprintf(tmp, SZ, fmt, ap); |
Sam Ravnborg | 7670f02 | 2006-03-16 23:04:08 -0800 | [diff] [blame] | 1041 | buf_write(buf, tmp, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | va_end(ap); |
| 1043 | } |
| 1044 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1045 | void buf_write(struct buffer *buf, const char *s, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | { |
| 1047 | if (buf->size - buf->pos < len) { |
Sam Ravnborg | 7670f02 | 2006-03-16 23:04:08 -0800 | [diff] [blame] | 1048 | buf->size += len + SZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | buf->p = realloc(buf->p, buf->size); |
| 1050 | } |
| 1051 | strncpy(buf->p + buf->pos, s, len); |
| 1052 | buf->pos += len; |
| 1053 | } |
| 1054 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1055 | /** |
| 1056 | * Header for the generated file |
| 1057 | **/ |
| 1058 | static void add_header(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | { |
| 1060 | buf_printf(b, "#include <linux/module.h>\n"); |
| 1061 | buf_printf(b, "#include <linux/vermagic.h>\n"); |
| 1062 | buf_printf(b, "#include <linux/compiler.h>\n"); |
| 1063 | buf_printf(b, "\n"); |
| 1064 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); |
| 1065 | buf_printf(b, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | buf_printf(b, "struct module __this_module\n"); |
| 1067 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 1068 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | if (mod->has_init) |
| 1070 | buf_printf(b, " .init = init_module,\n"); |
| 1071 | if (mod->has_cleanup) |
| 1072 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" |
| 1073 | " .exit = cleanup_module,\n" |
| 1074 | "#endif\n"); |
| 1075 | buf_printf(b, "};\n"); |
| 1076 | } |
| 1077 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1078 | /** |
| 1079 | * Record CRCs for unresolved symbols |
| 1080 | **/ |
| 1081 | static void add_versions(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | { |
| 1083 | struct symbol *s, *exp; |
| 1084 | |
| 1085 | for (s = mod->unres; s; s = s->next) { |
| 1086 | exp = find_symbol(s->name); |
| 1087 | if (!exp || exp->module == mod) { |
| 1088 | if (have_vmlinux && !s->weak) |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 1089 | warn("\"%s\" [%s.ko] undefined!\n", |
| 1090 | s->name, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | continue; |
| 1092 | } |
| 1093 | s->module = exp->module; |
| 1094 | s->crc_valid = exp->crc_valid; |
| 1095 | s->crc = exp->crc; |
| 1096 | } |
| 1097 | |
| 1098 | if (!modversions) |
| 1099 | return; |
| 1100 | |
| 1101 | buf_printf(b, "\n"); |
| 1102 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); |
| 1103 | buf_printf(b, "__attribute_used__\n"); |
| 1104 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
| 1105 | |
| 1106 | for (s = mod->unres; s; s = s->next) { |
| 1107 | if (!s->module) { |
| 1108 | continue; |
| 1109 | } |
| 1110 | if (!s->crc_valid) { |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 1111 | warn("\"%s\" [%s.ko] has no CRC!\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | s->name, mod->name); |
| 1113 | continue; |
| 1114 | } |
| 1115 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); |
| 1116 | } |
| 1117 | |
| 1118 | buf_printf(b, "};\n"); |
| 1119 | } |
| 1120 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1121 | static void add_depends(struct buffer *b, struct module *mod, |
| 1122 | struct module *modules) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | { |
| 1124 | struct symbol *s; |
| 1125 | struct module *m; |
| 1126 | int first = 1; |
| 1127 | |
| 1128 | for (m = modules; m; m = m->next) { |
| 1129 | m->seen = is_vmlinux(m->name); |
| 1130 | } |
| 1131 | |
| 1132 | buf_printf(b, "\n"); |
| 1133 | buf_printf(b, "static const char __module_depends[]\n"); |
| 1134 | buf_printf(b, "__attribute_used__\n"); |
| 1135 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
| 1136 | buf_printf(b, "\"depends="); |
| 1137 | for (s = mod->unres; s; s = s->next) { |
| 1138 | if (!s->module) |
| 1139 | continue; |
| 1140 | |
| 1141 | if (s->module->seen) |
| 1142 | continue; |
| 1143 | |
| 1144 | s->module->seen = 1; |
| 1145 | buf_printf(b, "%s%s", first ? "" : ",", |
| 1146 | strrchr(s->module->name, '/') + 1); |
| 1147 | first = 0; |
| 1148 | } |
| 1149 | buf_printf(b, "\";\n"); |
| 1150 | } |
| 1151 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1152 | static void add_srcversion(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | { |
| 1154 | if (mod->srcversion[0]) { |
| 1155 | buf_printf(b, "\n"); |
| 1156 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", |
| 1157 | mod->srcversion); |
| 1158 | } |
| 1159 | } |
| 1160 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1161 | static void write_if_changed(struct buffer *b, const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | { |
| 1163 | char *tmp; |
| 1164 | FILE *file; |
| 1165 | struct stat st; |
| 1166 | |
| 1167 | file = fopen(fname, "r"); |
| 1168 | if (!file) |
| 1169 | goto write; |
| 1170 | |
| 1171 | if (fstat(fileno(file), &st) < 0) |
| 1172 | goto close_write; |
| 1173 | |
| 1174 | if (st.st_size != b->pos) |
| 1175 | goto close_write; |
| 1176 | |
| 1177 | tmp = NOFAIL(malloc(b->pos)); |
| 1178 | if (fread(tmp, 1, b->pos, file) != b->pos) |
| 1179 | goto free_write; |
| 1180 | |
| 1181 | if (memcmp(tmp, b->p, b->pos) != 0) |
| 1182 | goto free_write; |
| 1183 | |
| 1184 | free(tmp); |
| 1185 | fclose(file); |
| 1186 | return; |
| 1187 | |
| 1188 | free_write: |
| 1189 | free(tmp); |
| 1190 | close_write: |
| 1191 | fclose(file); |
| 1192 | write: |
| 1193 | file = fopen(fname, "w"); |
| 1194 | if (!file) { |
| 1195 | perror(fname); |
| 1196 | exit(1); |
| 1197 | } |
| 1198 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { |
| 1199 | perror(fname); |
| 1200 | exit(1); |
| 1201 | } |
| 1202 | fclose(file); |
| 1203 | } |
| 1204 | |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1205 | /* parse Module.symvers file. line format: |
| 1206 | * 0x12345678<tab>symbol<tab>module[<tab>export] |
| 1207 | **/ |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1208 | static void read_dump(const char *fname, unsigned int kernel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | { |
| 1210 | unsigned long size, pos = 0; |
| 1211 | void *file = grab_file(fname, &size); |
| 1212 | char *line; |
| 1213 | |
| 1214 | if (!file) |
| 1215 | /* No symbol versions, silently ignore */ |
| 1216 | return; |
| 1217 | |
| 1218 | while ((line = get_next_line(&pos, file, size))) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1219 | char *symname, *modname, *d, *export; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | unsigned int crc; |
| 1221 | struct module *mod; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1222 | struct symbol *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | |
| 1224 | if (!(symname = strchr(line, '\t'))) |
| 1225 | goto fail; |
| 1226 | *symname++ = '\0'; |
| 1227 | if (!(modname = strchr(symname, '\t'))) |
| 1228 | goto fail; |
| 1229 | *modname++ = '\0'; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1230 | if (!(export = strchr(modname, '\t'))) |
| 1231 | *export++ = '\0'; |
| 1232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | crc = strtoul(line, &d, 16); |
| 1234 | if (*symname == '\0' || *modname == '\0' || *d != '\0') |
| 1235 | goto fail; |
| 1236 | |
| 1237 | if (!(mod = find_module(modname))) { |
| 1238 | if (is_vmlinux(modname)) { |
| 1239 | have_vmlinux = 1; |
| 1240 | } |
| 1241 | mod = new_module(NOFAIL(strdup(modname))); |
| 1242 | mod->skip = 1; |
| 1243 | } |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1244 | s = sym_add_exported(symname, mod, export_no(export)); |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 1245 | s->kernel = kernel; |
| 1246 | s->preloaded = 1; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1247 | sym_update_crc(symname, mod, crc, export_no(export)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
| 1249 | return; |
| 1250 | fail: |
| 1251 | fatal("parse error in symbol dump file\n"); |
| 1252 | } |
| 1253 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1254 | /* For normal builds always dump all symbols. |
| 1255 | * For external modules only dump symbols |
| 1256 | * that are not read from kernel Module.symvers. |
| 1257 | **/ |
| 1258 | static int dump_sym(struct symbol *sym) |
| 1259 | { |
| 1260 | if (!external_module) |
| 1261 | return 1; |
| 1262 | if (sym->vmlinux || sym->kernel) |
| 1263 | return 0; |
| 1264 | return 1; |
| 1265 | } |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1266 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1267 | static void write_dump(const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | { |
| 1269 | struct buffer buf = { }; |
| 1270 | struct symbol *symbol; |
| 1271 | int n; |
| 1272 | |
| 1273 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { |
| 1274 | symbol = symbolhash[n]; |
| 1275 | while (symbol) { |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1276 | if (dump_sym(symbol)) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1277 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1278 | symbol->crc, symbol->name, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame^] | 1279 | symbol->module->name, |
| 1280 | export_str(symbol->export)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | symbol = symbol->next; |
| 1282 | } |
| 1283 | } |
| 1284 | write_if_changed(&buf, fname); |
| 1285 | } |
| 1286 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1287 | int main(int argc, char **argv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | { |
| 1289 | struct module *mod; |
| 1290 | struct buffer buf = { }; |
| 1291 | char fname[SZ]; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1292 | char *kernel_read = NULL, *module_read = NULL; |
| 1293 | char *dump_write = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | int opt; |
| 1295 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1296 | while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | switch(opt) { |
| 1298 | case 'i': |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1299 | kernel_read = optarg; |
| 1300 | break; |
| 1301 | case 'I': |
| 1302 | module_read = optarg; |
| 1303 | external_module = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | break; |
| 1305 | case 'm': |
| 1306 | modversions = 1; |
| 1307 | break; |
| 1308 | case 'o': |
| 1309 | dump_write = optarg; |
| 1310 | break; |
| 1311 | case 'a': |
| 1312 | all_versions = 1; |
| 1313 | break; |
| 1314 | default: |
| 1315 | exit(1); |
| 1316 | } |
| 1317 | } |
| 1318 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1319 | if (kernel_read) |
| 1320 | read_dump(kernel_read, 1); |
| 1321 | if (module_read) |
| 1322 | read_dump(module_read, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
| 1324 | while (optind < argc) { |
| 1325 | read_symbols(argv[optind++]); |
| 1326 | } |
| 1327 | |
| 1328 | for (mod = modules; mod; mod = mod->next) { |
| 1329 | if (mod->skip) |
| 1330 | continue; |
| 1331 | |
| 1332 | buf.pos = 0; |
| 1333 | |
| 1334 | add_header(&buf, mod); |
| 1335 | add_versions(&buf, mod); |
| 1336 | add_depends(&buf, mod, modules); |
| 1337 | add_moddevtable(&buf, mod); |
| 1338 | add_srcversion(&buf, mod); |
| 1339 | |
| 1340 | sprintf(fname, "%s.mod.c", mod->name); |
| 1341 | write_if_changed(&buf, fname); |
| 1342 | } |
| 1343 | |
| 1344 | if (dump_write) |
| 1345 | write_dump(dump_write); |
| 1346 | |
| 1347 | return 0; |
| 1348 | } |