Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * kallsyms.c: in-kernel printing of symbolic oopses and stack traces. |
| 3 | * |
| 4 | * Rewritten and vastly simplified by Rusty Russell for in-kernel |
| 5 | * module loader: |
| 6 | * Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation |
| 7 | * |
| 8 | * ChangeLog: |
| 9 | * |
| 10 | * (25/Aug/2004) Paulo Marques <pmarques@grupopie.com> |
| 11 | * Changed the compression method from stem compression to "table lookup" |
| 12 | * compression (see scripts/kallsyms.c for a more complete description) |
| 13 | */ |
| 14 | #include <linux/kallsyms.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/seq_file.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/proc_fs.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 21 | #include <linux/sched.h> /* for cond_resched */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/mm.h> |
Adam B. Jerome | 07354a0 | 2006-12-06 20:35:30 -0800 | [diff] [blame] | 23 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <asm/sections.h> |
| 26 | |
| 27 | #ifdef CONFIG_KALLSYMS_ALL |
| 28 | #define all_var 1 |
| 29 | #else |
| 30 | #define all_var 0 |
| 31 | #endif |
| 32 | |
| 33 | /* These will be re-linked against their real values during the second link stage */ |
Jan Beulich | aad0947 | 2006-12-08 02:35:57 -0800 | [diff] [blame] | 34 | extern const unsigned long kallsyms_addresses[] __attribute__((weak)); |
| 35 | extern const unsigned long kallsyms_num_syms __attribute__((weak)); |
| 36 | extern const u8 kallsyms_names[] __attribute__((weak)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Jan Beulich | aad0947 | 2006-12-08 02:35:57 -0800 | [diff] [blame] | 38 | extern const u8 kallsyms_token_table[] __attribute__((weak)); |
| 39 | extern const u16 kallsyms_token_index[] __attribute__((weak)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Jan Beulich | aad0947 | 2006-12-08 02:35:57 -0800 | [diff] [blame] | 41 | extern const unsigned long kallsyms_markers[] __attribute__((weak)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | static inline int is_kernel_inittext(unsigned long addr) |
| 44 | { |
| 45 | if (addr >= (unsigned long)_sinittext |
| 46 | && addr <= (unsigned long)_einittext) |
| 47 | return 1; |
| 48 | return 0; |
| 49 | } |
| 50 | |
David Woodhouse | 075d6eb | 2005-05-05 16:15:09 -0700 | [diff] [blame] | 51 | static inline int is_kernel_extratext(unsigned long addr) |
| 52 | { |
| 53 | if (addr >= (unsigned long)_sextratext |
| 54 | && addr <= (unsigned long)_eextratext) |
| 55 | return 1; |
| 56 | return 0; |
| 57 | } |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | static inline int is_kernel_text(unsigned long addr) |
| 60 | { |
| 61 | if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) |
| 62 | return 1; |
| 63 | return in_gate_area_no_task(addr); |
| 64 | } |
| 65 | |
| 66 | static inline int is_kernel(unsigned long addr) |
| 67 | { |
| 68 | if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) |
| 69 | return 1; |
| 70 | return in_gate_area_no_task(addr); |
| 71 | } |
| 72 | |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 73 | static int is_ksym_addr(unsigned long addr) |
| 74 | { |
| 75 | if (all_var) |
| 76 | return is_kernel(addr); |
| 77 | |
| 78 | return is_kernel_text(addr) || is_kernel_inittext(addr) || |
| 79 | is_kernel_extratext(addr); |
| 80 | } |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* expand a compressed symbol data into the resulting uncompressed string, |
| 83 | given the offset to where the symbol is in the compressed stream */ |
| 84 | static unsigned int kallsyms_expand_symbol(unsigned int off, char *result) |
| 85 | { |
| 86 | int len, skipped_first = 0; |
Jan Beulich | aad0947 | 2006-12-08 02:35:57 -0800 | [diff] [blame] | 87 | const u8 *tptr, *data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | /* get the compressed symbol length from the first symbol byte */ |
| 90 | data = &kallsyms_names[off]; |
| 91 | len = *data; |
| 92 | data++; |
| 93 | |
| 94 | /* update the offset to return the offset for the next symbol on |
| 95 | * the compressed stream */ |
| 96 | off += len + 1; |
| 97 | |
| 98 | /* for every byte on the compressed symbol data, copy the table |
| 99 | entry for that byte */ |
| 100 | while(len) { |
| 101 | tptr = &kallsyms_token_table[ kallsyms_token_index[*data] ]; |
| 102 | data++; |
| 103 | len--; |
| 104 | |
| 105 | while (*tptr) { |
| 106 | if(skipped_first) { |
| 107 | *result = *tptr; |
| 108 | result++; |
| 109 | } else |
| 110 | skipped_first = 1; |
| 111 | tptr++; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | *result = '\0'; |
| 116 | |
| 117 | /* return to offset to the next symbol */ |
| 118 | return off; |
| 119 | } |
| 120 | |
| 121 | /* get symbol type information. This is encoded as a single char at the |
| 122 | * begining of the symbol name */ |
| 123 | static char kallsyms_get_symbol_type(unsigned int off) |
| 124 | { |
| 125 | /* get just the first code, look it up in the token table, and return the |
| 126 | * first char from this token */ |
| 127 | return kallsyms_token_table[ kallsyms_token_index[ kallsyms_names[off+1] ] ]; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /* find the offset on the compressed stream given and index in the |
| 132 | * kallsyms array */ |
| 133 | static unsigned int get_symbol_offset(unsigned long pos) |
| 134 | { |
Jan Beulich | aad0947 | 2006-12-08 02:35:57 -0800 | [diff] [blame] | 135 | const u8 *name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | int i; |
| 137 | |
| 138 | /* use the closest marker we have. We have markers every 256 positions, |
| 139 | * so that should be close enough */ |
| 140 | name = &kallsyms_names[ kallsyms_markers[pos>>8] ]; |
| 141 | |
| 142 | /* sequentially scan all the symbols up to the point we're searching for. |
| 143 | * Every symbol is stored in a [<len>][<len> bytes of data] format, so we |
| 144 | * just need to add the len to the current pointer for every symbol we |
| 145 | * wish to skip */ |
| 146 | for(i = 0; i < (pos&0xFF); i++) |
| 147 | name = name + (*name) + 1; |
| 148 | |
| 149 | return name - kallsyms_names; |
| 150 | } |
| 151 | |
| 152 | /* Lookup the address for this symbol. Returns 0 if not found. */ |
| 153 | unsigned long kallsyms_lookup_name(const char *name) |
| 154 | { |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 155 | char namebuf[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | unsigned long i; |
| 157 | unsigned int off; |
| 158 | |
| 159 | for (i = 0, off = 0; i < kallsyms_num_syms; i++) { |
| 160 | off = kallsyms_expand_symbol(off, namebuf); |
| 161 | |
| 162 | if (strcmp(namebuf, name) == 0) |
| 163 | return kallsyms_addresses[i]; |
| 164 | } |
| 165 | return module_kallsyms_lookup_name(name); |
| 166 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 168 | static unsigned long get_symbol_pos(unsigned long addr, |
| 169 | unsigned long *symbolsize, |
| 170 | unsigned long *offset) |
| 171 | { |
| 172 | unsigned long symbol_start = 0, symbol_end = 0; |
| 173 | unsigned long i, low, high, mid; |
| 174 | |
| 175 | /* This kernel should never had been booted. */ |
| 176 | BUG_ON(!kallsyms_addresses); |
| 177 | |
| 178 | /* do a binary search on the sorted kallsyms_addresses array */ |
| 179 | low = 0; |
| 180 | high = kallsyms_num_syms; |
| 181 | |
| 182 | while (high - low > 1) { |
| 183 | mid = (low + high) / 2; |
| 184 | if (kallsyms_addresses[mid] <= addr) |
| 185 | low = mid; |
| 186 | else |
| 187 | high = mid; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * search for the first aliased symbol. Aliased |
| 192 | * symbols are symbols with the same address |
| 193 | */ |
| 194 | while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low]) |
| 195 | --low; |
| 196 | |
| 197 | symbol_start = kallsyms_addresses[low]; |
| 198 | |
| 199 | /* Search for next non-aliased symbol */ |
| 200 | for (i = low + 1; i < kallsyms_num_syms; i++) { |
| 201 | if (kallsyms_addresses[i] > symbol_start) { |
| 202 | symbol_end = kallsyms_addresses[i]; |
| 203 | break; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* if we found no next symbol, we use the end of the section */ |
| 208 | if (!symbol_end) { |
| 209 | if (is_kernel_inittext(addr)) |
| 210 | symbol_end = (unsigned long)_einittext; |
| 211 | else if (all_var) |
| 212 | symbol_end = (unsigned long)_end; |
| 213 | else |
| 214 | symbol_end = (unsigned long)_etext; |
| 215 | } |
| 216 | |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 217 | if (symbolsize) |
| 218 | *symbolsize = symbol_end - symbol_start; |
| 219 | if (offset) |
| 220 | *offset = addr - symbol_start; |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 221 | |
| 222 | return low; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Lookup an address but don't bother to find any names. |
| 227 | */ |
| 228 | int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, |
| 229 | unsigned long *offset) |
| 230 | { |
| 231 | if (is_ksym_addr(addr)) |
| 232 | return !!get_symbol_pos(addr, symbolsize, offset); |
| 233 | |
| 234 | return !!module_address_lookup(addr, symbolsize, offset, NULL); |
| 235 | } |
| 236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | /* |
| 238 | * Lookup an address |
| 239 | * - modname is set to NULL if it's in the kernel |
| 240 | * - we guarantee that the returned name is valid until we reschedule even if |
| 241 | * it resides in a module |
| 242 | * - we also guarantee that modname will be valid until rescheduled |
| 243 | */ |
| 244 | const char *kallsyms_lookup(unsigned long addr, |
| 245 | unsigned long *symbolsize, |
| 246 | unsigned long *offset, |
| 247 | char **modname, char *namebuf) |
| 248 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | const char *msym; |
| 250 | |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 251 | namebuf[KSYM_NAME_LEN - 1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | namebuf[0] = 0; |
| 253 | |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 254 | if (is_ksym_addr(addr)) { |
| 255 | unsigned long pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 257 | pos = get_symbol_pos(addr, symbolsize, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | /* Grab name */ |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 259 | kallsyms_expand_symbol(get_symbol_offset(pos), namebuf); |
Kyle McMartin | 7a74fc4 | 2007-05-30 02:43:16 -0400 | [diff] [blame] | 260 | if (modname) |
| 261 | *modname = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | return namebuf; |
| 263 | } |
| 264 | |
| 265 | /* see if it's in a module */ |
| 266 | msym = module_address_lookup(addr, symbolsize, offset, modname); |
| 267 | if (msym) |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 268 | return strncpy(namebuf, msym, KSYM_NAME_LEN - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | return NULL; |
| 271 | } |
| 272 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 273 | int lookup_symbol_name(unsigned long addr, char *symname) |
| 274 | { |
| 275 | symname[0] = '\0'; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 276 | symname[KSYM_NAME_LEN - 1] = '\0'; |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 277 | |
| 278 | if (is_ksym_addr(addr)) { |
| 279 | unsigned long pos; |
| 280 | |
| 281 | pos = get_symbol_pos(addr, NULL, NULL); |
| 282 | /* Grab name */ |
| 283 | kallsyms_expand_symbol(get_symbol_offset(pos), symname); |
| 284 | return 0; |
| 285 | } |
| 286 | /* see if it's in a module */ |
| 287 | return lookup_module_symbol_name(addr, symname); |
| 288 | } |
| 289 | |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 290 | int lookup_symbol_attrs(unsigned long addr, unsigned long *size, |
| 291 | unsigned long *offset, char *modname, char *name) |
| 292 | { |
| 293 | name[0] = '\0'; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 294 | name[KSYM_NAME_LEN - 1] = '\0'; |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 295 | |
| 296 | if (is_ksym_addr(addr)) { |
| 297 | unsigned long pos; |
| 298 | |
| 299 | pos = get_symbol_pos(addr, size, offset); |
| 300 | /* Grab name */ |
| 301 | kallsyms_expand_symbol(get_symbol_offset(pos), name); |
| 302 | modname[0] = '\0'; |
| 303 | return 0; |
| 304 | } |
| 305 | /* see if it's in a module */ |
| 306 | return lookup_module_symbol_attrs(addr, size, offset, modname, name); |
| 307 | } |
| 308 | |
Robert Peterson | 42e3808 | 2007-04-30 15:09:48 -0700 | [diff] [blame] | 309 | /* Look up a kernel symbol and return it in a text buffer. */ |
| 310 | int sprint_symbol(char *buffer, unsigned long address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | { |
| 312 | char *modname; |
| 313 | const char *name; |
| 314 | unsigned long offset, size; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 315 | char namebuf[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | name = kallsyms_lookup(address, &size, &offset, &modname, namebuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | if (!name) |
Robert Peterson | 42e3808 | 2007-04-30 15:09:48 -0700 | [diff] [blame] | 319 | return sprintf(buffer, "0x%lx", address); |
Andrew Morton | 19769b7 | 2007-07-15 23:41:24 -0700 | [diff] [blame] | 320 | |
| 321 | if (modname) |
| 322 | return sprintf(buffer, "%s+%#lx/%#lx [%s]", name, offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | size, modname); |
Andrew Morton | 19769b7 | 2007-07-15 23:41:24 -0700 | [diff] [blame] | 324 | else |
| 325 | return sprintf(buffer, "%s+%#lx/%#lx", name, offset, size); |
Robert Peterson | 42e3808 | 2007-04-30 15:09:48 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /* Look up a kernel symbol and print it to the kernel messages. */ |
| 329 | void __print_symbol(const char *fmt, unsigned long address) |
| 330 | { |
| 331 | char buffer[KSYM_SYMBOL_LEN]; |
| 332 | |
| 333 | sprint_symbol(buffer, address); |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | printk(fmt, buffer); |
| 336 | } |
| 337 | |
| 338 | /* To avoid using get_symbol_offset for every symbol, we carry prefix along. */ |
| 339 | struct kallsym_iter |
| 340 | { |
| 341 | loff_t pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | unsigned long value; |
| 343 | unsigned int nameoff; /* If iterating in core kernel symbols */ |
| 344 | char type; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 345 | char name[KSYM_NAME_LEN]; |
| 346 | char module_name[MODULE_NAME_LEN]; |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 347 | int exported; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | }; |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | static int get_ksymbol_mod(struct kallsym_iter *iter) |
| 351 | { |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 352 | if (module_get_kallsym(iter->pos - kallsyms_num_syms, &iter->value, |
| 353 | &iter->type, iter->name, iter->module_name, |
| 354 | &iter->exported) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | return 1; |
| 357 | } |
| 358 | |
| 359 | /* Returns space to next name. */ |
| 360 | static unsigned long get_ksymbol_core(struct kallsym_iter *iter) |
| 361 | { |
| 362 | unsigned off = iter->nameoff; |
| 363 | |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 364 | iter->module_name[0] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | iter->value = kallsyms_addresses[iter->pos]; |
| 366 | |
| 367 | iter->type = kallsyms_get_symbol_type(off); |
| 368 | |
| 369 | off = kallsyms_expand_symbol(off, iter->name); |
| 370 | |
| 371 | return off - iter->nameoff; |
| 372 | } |
| 373 | |
| 374 | static void reset_iter(struct kallsym_iter *iter, loff_t new_pos) |
| 375 | { |
| 376 | iter->name[0] = '\0'; |
| 377 | iter->nameoff = get_symbol_offset(new_pos); |
| 378 | iter->pos = new_pos; |
| 379 | } |
| 380 | |
| 381 | /* Returns false if pos at or past end of file. */ |
| 382 | static int update_iter(struct kallsym_iter *iter, loff_t pos) |
| 383 | { |
| 384 | /* Module symbols can be accessed randomly. */ |
| 385 | if (pos >= kallsyms_num_syms) { |
| 386 | iter->pos = pos; |
| 387 | return get_ksymbol_mod(iter); |
| 388 | } |
| 389 | |
| 390 | /* If we're not on the desired position, reset to new position. */ |
| 391 | if (pos != iter->pos) |
| 392 | reset_iter(iter, pos); |
| 393 | |
| 394 | iter->nameoff += get_ksymbol_core(iter); |
| 395 | iter->pos++; |
| 396 | |
| 397 | return 1; |
| 398 | } |
| 399 | |
| 400 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) |
| 401 | { |
| 402 | (*pos)++; |
| 403 | |
| 404 | if (!update_iter(m->private, *pos)) |
| 405 | return NULL; |
| 406 | return p; |
| 407 | } |
| 408 | |
| 409 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 410 | { |
| 411 | if (!update_iter(m->private, *pos)) |
| 412 | return NULL; |
| 413 | return m->private; |
| 414 | } |
| 415 | |
| 416 | static void s_stop(struct seq_file *m, void *p) |
| 417 | { |
| 418 | } |
| 419 | |
| 420 | static int s_show(struct seq_file *m, void *p) |
| 421 | { |
| 422 | struct kallsym_iter *iter = m->private; |
| 423 | |
| 424 | /* Some debugging symbols have no name. Ignore them. */ |
| 425 | if (!iter->name[0]) |
| 426 | return 0; |
| 427 | |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 428 | if (iter->module_name[0]) { |
| 429 | char type; |
| 430 | |
| 431 | /* Label it "global" if it is exported, |
| 432 | * "local" if not exported. */ |
| 433 | type = iter->exported ? toupper(iter->type) : |
| 434 | tolower(iter->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | seq_printf(m, "%0*lx %c %s\t[%s]\n", |
| 436 | (int)(2*sizeof(void*)), |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 437 | iter->value, type, iter->name, iter->module_name); |
| 438 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | seq_printf(m, "%0*lx %c %s\n", |
| 440 | (int)(2*sizeof(void*)), |
| 441 | iter->value, iter->type, iter->name); |
| 442 | return 0; |
| 443 | } |
| 444 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 445 | static const struct seq_operations kallsyms_op = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | .start = s_start, |
| 447 | .next = s_next, |
| 448 | .stop = s_stop, |
| 449 | .show = s_show |
| 450 | }; |
| 451 | |
| 452 | static int kallsyms_open(struct inode *inode, struct file *file) |
| 453 | { |
| 454 | /* We keep iterator in m->private, since normal case is to |
| 455 | * s_start from where we left off, so we avoid doing |
| 456 | * using get_symbol_offset for every symbol */ |
| 457 | struct kallsym_iter *iter; |
| 458 | int ret; |
| 459 | |
| 460 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
| 461 | if (!iter) |
| 462 | return -ENOMEM; |
| 463 | reset_iter(iter, 0); |
| 464 | |
| 465 | ret = seq_open(file, &kallsyms_op); |
| 466 | if (ret == 0) |
| 467 | ((struct seq_file *)file->private_data)->private = iter; |
| 468 | else |
| 469 | kfree(iter); |
| 470 | return ret; |
| 471 | } |
| 472 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 473 | static const struct file_operations kallsyms_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | .open = kallsyms_open, |
| 475 | .read = seq_read, |
| 476 | .llseek = seq_lseek, |
Martin Peschke | 5a0c6a0 | 2007-05-08 00:29:25 -0700 | [diff] [blame] | 477 | .release = seq_release_private, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | }; |
| 479 | |
| 480 | static int __init kallsyms_init(void) |
| 481 | { |
| 482 | struct proc_dir_entry *entry; |
| 483 | |
| 484 | entry = create_proc_entry("kallsyms", 0444, NULL); |
| 485 | if (entry) |
| 486 | entry->proc_fops = &kallsyms_operations; |
| 487 | return 0; |
| 488 | } |
| 489 | __initcall(kallsyms_init); |
| 490 | |
| 491 | EXPORT_SYMBOL(__print_symbol); |
Robert Peterson | 42e3808 | 2007-04-30 15:09:48 -0700 | [diff] [blame] | 492 | EXPORT_SYMBOL_GPL(sprint_symbol); |