Commit | Line | Data |
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1da177e4 LT |
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> | |
67fc4e0c | 19 | #include <linux/kdb.h> |
1da177e4 LT |
20 | #include <linux/err.h> |
21 | #include <linux/proc_fs.h> | |
4e57b681 | 22 | #include <linux/sched.h> /* for cond_resched */ |
1da177e4 | 23 | #include <linux/mm.h> |
07354a00 | 24 | #include <linux/ctype.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
52f5684c | 26 | #include <linux/compiler.h> |
1da177e4 LT |
27 | |
28 | #include <asm/sections.h> | |
29 | ||
30 | #ifdef CONFIG_KALLSYMS_ALL | |
31 | #define all_var 1 | |
32 | #else | |
33 | #define all_var 0 | |
34 | #endif | |
35 | ||
ad6ccfad MK |
36 | /* |
37 | * These will be re-linked against their real values | |
38 | * during the second link stage. | |
39 | */ | |
52f5684c | 40 | extern const unsigned long kallsyms_addresses[] __weak; |
2213e9a6 | 41 | extern const int kallsyms_offsets[] __weak; |
52f5684c | 42 | extern const u8 kallsyms_names[] __weak; |
1da177e4 | 43 | |
ad6ccfad MK |
44 | /* |
45 | * Tell the compiler that the count isn't in the small data section if the arch | |
46 | * has one (eg: FRV). | |
9e6c1e63 DH |
47 | */ |
48 | extern const unsigned long kallsyms_num_syms | |
2ea03891 | 49 | __attribute__((weak, section(".rodata"))); |
9e6c1e63 | 50 | |
2213e9a6 AB |
51 | extern const unsigned long kallsyms_relative_base |
52 | __attribute__((weak, section(".rodata"))); | |
53 | ||
52f5684c GID |
54 | extern const u8 kallsyms_token_table[] __weak; |
55 | extern const u16 kallsyms_token_index[] __weak; | |
1da177e4 | 56 | |
52f5684c | 57 | extern const unsigned long kallsyms_markers[] __weak; |
1da177e4 LT |
58 | |
59 | static inline int is_kernel_inittext(unsigned long addr) | |
60 | { | |
61 | if (addr >= (unsigned long)_sinittext | |
62 | && addr <= (unsigned long)_einittext) | |
63 | return 1; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static inline int is_kernel_text(unsigned long addr) | |
68 | { | |
128e8db3 MF |
69 | if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) || |
70 | arch_is_kernel_text(addr)) | |
1da177e4 | 71 | return 1; |
cae5d390 | 72 | return in_gate_area_no_mm(addr); |
1da177e4 LT |
73 | } |
74 | ||
75 | static inline int is_kernel(unsigned long addr) | |
76 | { | |
77 | if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) | |
78 | return 1; | |
cae5d390 | 79 | return in_gate_area_no_mm(addr); |
1da177e4 LT |
80 | } |
81 | ||
ffc50891 FBH |
82 | static int is_ksym_addr(unsigned long addr) |
83 | { | |
84 | if (all_var) | |
85 | return is_kernel(addr); | |
86 | ||
a3b81113 | 87 | return is_kernel_text(addr) || is_kernel_inittext(addr); |
ffc50891 FBH |
88 | } |
89 | ||
ad6ccfad MK |
90 | /* |
91 | * Expand a compressed symbol data into the resulting uncompressed string, | |
e3f26752 | 92 | * if uncompressed string is too long (>= maxlen), it will be truncated, |
ad6ccfad MK |
93 | * given the offset to where the symbol is in the compressed stream. |
94 | */ | |
e3f26752 CG |
95 | static unsigned int kallsyms_expand_symbol(unsigned int off, |
96 | char *result, size_t maxlen) | |
1da177e4 LT |
97 | { |
98 | int len, skipped_first = 0; | |
aad09470 | 99 | const u8 *tptr, *data; |
1da177e4 | 100 | |
ad6ccfad | 101 | /* Get the compressed symbol length from the first symbol byte. */ |
1da177e4 LT |
102 | data = &kallsyms_names[off]; |
103 | len = *data; | |
104 | data++; | |
105 | ||
ad6ccfad MK |
106 | /* |
107 | * Update the offset to return the offset for the next symbol on | |
108 | * the compressed stream. | |
109 | */ | |
1da177e4 LT |
110 | off += len + 1; |
111 | ||
ad6ccfad MK |
112 | /* |
113 | * For every byte on the compressed symbol data, copy the table | |
114 | * entry for that byte. | |
115 | */ | |
116 | while (len) { | |
117 | tptr = &kallsyms_token_table[kallsyms_token_index[*data]]; | |
1da177e4 LT |
118 | data++; |
119 | len--; | |
120 | ||
121 | while (*tptr) { | |
ad6ccfad | 122 | if (skipped_first) { |
e3f26752 CG |
123 | if (maxlen <= 1) |
124 | goto tail; | |
1da177e4 LT |
125 | *result = *tptr; |
126 | result++; | |
e3f26752 | 127 | maxlen--; |
1da177e4 LT |
128 | } else |
129 | skipped_first = 1; | |
130 | tptr++; | |
131 | } | |
132 | } | |
133 | ||
e3f26752 CG |
134 | tail: |
135 | if (maxlen) | |
136 | *result = '\0'; | |
1da177e4 | 137 | |
ad6ccfad | 138 | /* Return to offset to the next symbol. */ |
1da177e4 LT |
139 | return off; |
140 | } | |
141 | ||
ad6ccfad MK |
142 | /* |
143 | * Get symbol type information. This is encoded as a single char at the | |
144 | * beginning of the symbol name. | |
145 | */ | |
1da177e4 LT |
146 | static char kallsyms_get_symbol_type(unsigned int off) |
147 | { | |
ad6ccfad MK |
148 | /* |
149 | * Get just the first code, look it up in the token table, | |
150 | * and return the first char from this token. | |
151 | */ | |
152 | return kallsyms_token_table[kallsyms_token_index[kallsyms_names[off + 1]]]; | |
1da177e4 LT |
153 | } |
154 | ||
155 | ||
ad6ccfad MK |
156 | /* |
157 | * Find the offset on the compressed stream given and index in the | |
158 | * kallsyms array. | |
159 | */ | |
1da177e4 LT |
160 | static unsigned int get_symbol_offset(unsigned long pos) |
161 | { | |
aad09470 | 162 | const u8 *name; |
1da177e4 LT |
163 | int i; |
164 | ||
ad6ccfad MK |
165 | /* |
166 | * Use the closest marker we have. We have markers every 256 positions, | |
167 | * so that should be close enough. | |
168 | */ | |
169 | name = &kallsyms_names[kallsyms_markers[pos >> 8]]; | |
1da177e4 | 170 | |
ad6ccfad MK |
171 | /* |
172 | * Sequentially scan all the symbols up to the point we're searching | |
173 | * for. Every symbol is stored in a [<len>][<len> bytes of data] format, | |
174 | * so we just need to add the len to the current pointer for every | |
175 | * symbol we wish to skip. | |
176 | */ | |
177 | for (i = 0; i < (pos & 0xFF); i++) | |
1da177e4 LT |
178 | name = name + (*name) + 1; |
179 | ||
180 | return name - kallsyms_names; | |
181 | } | |
182 | ||
2213e9a6 AB |
183 | static unsigned long kallsyms_sym_address(int idx) |
184 | { | |
185 | if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE)) | |
186 | return kallsyms_addresses[idx]; | |
187 | ||
188 | /* values are unsigned offsets if --absolute-percpu is not in effect */ | |
189 | if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU)) | |
190 | return kallsyms_relative_base + (u32)kallsyms_offsets[idx]; | |
191 | ||
192 | /* ...otherwise, positive offsets are absolute values */ | |
193 | if (kallsyms_offsets[idx] >= 0) | |
194 | return kallsyms_offsets[idx]; | |
195 | ||
196 | /* ...and negative offsets are relative to kallsyms_relative_base - 1 */ | |
197 | return kallsyms_relative_base - 1 - kallsyms_offsets[idx]; | |
198 | } | |
199 | ||
1da177e4 LT |
200 | /* Lookup the address for this symbol. Returns 0 if not found. */ |
201 | unsigned long kallsyms_lookup_name(const char *name) | |
202 | { | |
9281acea | 203 | char namebuf[KSYM_NAME_LEN]; |
1da177e4 LT |
204 | unsigned long i; |
205 | unsigned int off; | |
206 | ||
207 | for (i = 0, off = 0; i < kallsyms_num_syms; i++) { | |
e3f26752 | 208 | off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf)); |
1da177e4 LT |
209 | |
210 | if (strcmp(namebuf, name) == 0) | |
2213e9a6 | 211 | return kallsyms_sym_address(i); |
1da177e4 LT |
212 | } |
213 | return module_kallsyms_lookup_name(name); | |
214 | } | |
f60d24d2 | 215 | EXPORT_SYMBOL_GPL(kallsyms_lookup_name); |
1da177e4 | 216 | |
75a66614 AK |
217 | int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, |
218 | unsigned long), | |
219 | void *data) | |
220 | { | |
221 | char namebuf[KSYM_NAME_LEN]; | |
222 | unsigned long i; | |
223 | unsigned int off; | |
224 | int ret; | |
225 | ||
226 | for (i = 0, off = 0; i < kallsyms_num_syms; i++) { | |
e3f26752 | 227 | off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf)); |
2213e9a6 | 228 | ret = fn(data, namebuf, NULL, kallsyms_sym_address(i)); |
75a66614 AK |
229 | if (ret != 0) |
230 | return ret; | |
231 | } | |
232 | return module_kallsyms_on_each_symbol(fn, data); | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(kallsyms_on_each_symbol); | |
235 | ||
ffc50891 FBH |
236 | static unsigned long get_symbol_pos(unsigned long addr, |
237 | unsigned long *symbolsize, | |
238 | unsigned long *offset) | |
239 | { | |
240 | unsigned long symbol_start = 0, symbol_end = 0; | |
241 | unsigned long i, low, high, mid; | |
242 | ||
2ea03891 | 243 | /* This kernel should never had been booted. */ |
2213e9a6 AB |
244 | if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE)) |
245 | BUG_ON(!kallsyms_addresses); | |
246 | else | |
247 | BUG_ON(!kallsyms_offsets); | |
2ea03891 | 248 | |
ad6ccfad | 249 | /* Do a binary search on the sorted kallsyms_addresses array. */ |
ffc50891 FBH |
250 | low = 0; |
251 | high = kallsyms_num_syms; | |
252 | ||
253 | while (high - low > 1) { | |
2fc9c4e1 | 254 | mid = low + (high - low) / 2; |
2213e9a6 | 255 | if (kallsyms_sym_address(mid) <= addr) |
ffc50891 FBH |
256 | low = mid; |
257 | else | |
258 | high = mid; | |
259 | } | |
260 | ||
261 | /* | |
ad6ccfad MK |
262 | * Search for the first aliased symbol. Aliased |
263 | * symbols are symbols with the same address. | |
ffc50891 | 264 | */ |
2213e9a6 | 265 | while (low && kallsyms_sym_address(low-1) == kallsyms_sym_address(low)) |
ffc50891 FBH |
266 | --low; |
267 | ||
2213e9a6 | 268 | symbol_start = kallsyms_sym_address(low); |
ffc50891 | 269 | |
ad6ccfad | 270 | /* Search for next non-aliased symbol. */ |
ffc50891 | 271 | for (i = low + 1; i < kallsyms_num_syms; i++) { |
2213e9a6 AB |
272 | if (kallsyms_sym_address(i) > symbol_start) { |
273 | symbol_end = kallsyms_sym_address(i); | |
ffc50891 FBH |
274 | break; |
275 | } | |
276 | } | |
277 | ||
ad6ccfad | 278 | /* If we found no next symbol, we use the end of the section. */ |
ffc50891 FBH |
279 | if (!symbol_end) { |
280 | if (is_kernel_inittext(addr)) | |
281 | symbol_end = (unsigned long)_einittext; | |
282 | else if (all_var) | |
283 | symbol_end = (unsigned long)_end; | |
284 | else | |
285 | symbol_end = (unsigned long)_etext; | |
286 | } | |
287 | ||
ffb45122 AD |
288 | if (symbolsize) |
289 | *symbolsize = symbol_end - symbol_start; | |
290 | if (offset) | |
291 | *offset = addr - symbol_start; | |
ffc50891 FBH |
292 | |
293 | return low; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Lookup an address but don't bother to find any names. | |
298 | */ | |
299 | int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, | |
300 | unsigned long *offset) | |
301 | { | |
6dd06c9f | 302 | char namebuf[KSYM_NAME_LEN]; |
ffc50891 FBH |
303 | if (is_ksym_addr(addr)) |
304 | return !!get_symbol_pos(addr, symbolsize, offset); | |
305 | ||
6dd06c9f | 306 | return !!module_address_lookup(addr, symbolsize, offset, NULL, namebuf); |
ffc50891 FBH |
307 | } |
308 | ||
1da177e4 LT |
309 | /* |
310 | * Lookup an address | |
ad6ccfad MK |
311 | * - modname is set to NULL if it's in the kernel. |
312 | * - We guarantee that the returned name is valid until we reschedule even if. | |
313 | * It resides in a module. | |
314 | * - We also guarantee that modname will be valid until rescheduled. | |
1da177e4 LT |
315 | */ |
316 | const char *kallsyms_lookup(unsigned long addr, | |
317 | unsigned long *symbolsize, | |
318 | unsigned long *offset, | |
319 | char **modname, char *namebuf) | |
320 | { | |
9281acea | 321 | namebuf[KSYM_NAME_LEN - 1] = 0; |
1da177e4 LT |
322 | namebuf[0] = 0; |
323 | ||
ffc50891 FBH |
324 | if (is_ksym_addr(addr)) { |
325 | unsigned long pos; | |
1da177e4 | 326 | |
ffc50891 | 327 | pos = get_symbol_pos(addr, symbolsize, offset); |
1da177e4 | 328 | /* Grab name */ |
e3f26752 CG |
329 | kallsyms_expand_symbol(get_symbol_offset(pos), |
330 | namebuf, KSYM_NAME_LEN); | |
7a74fc49 KM |
331 | if (modname) |
332 | *modname = NULL; | |
1da177e4 LT |
333 | return namebuf; |
334 | } | |
335 | ||
ad6ccfad | 336 | /* See if it's in a module. */ |
6dd06c9f RR |
337 | return module_address_lookup(addr, symbolsize, offset, modname, |
338 | namebuf); | |
1da177e4 LT |
339 | } |
340 | ||
9d65cb4a AD |
341 | int lookup_symbol_name(unsigned long addr, char *symname) |
342 | { | |
343 | symname[0] = '\0'; | |
9281acea | 344 | symname[KSYM_NAME_LEN - 1] = '\0'; |
9d65cb4a AD |
345 | |
346 | if (is_ksym_addr(addr)) { | |
347 | unsigned long pos; | |
348 | ||
349 | pos = get_symbol_pos(addr, NULL, NULL); | |
350 | /* Grab name */ | |
e3f26752 CG |
351 | kallsyms_expand_symbol(get_symbol_offset(pos), |
352 | symname, KSYM_NAME_LEN); | |
9d65cb4a AD |
353 | return 0; |
354 | } | |
ad6ccfad | 355 | /* See if it's in a module. */ |
9d65cb4a AD |
356 | return lookup_module_symbol_name(addr, symname); |
357 | } | |
358 | ||
a5c43dae AD |
359 | int lookup_symbol_attrs(unsigned long addr, unsigned long *size, |
360 | unsigned long *offset, char *modname, char *name) | |
361 | { | |
362 | name[0] = '\0'; | |
9281acea | 363 | name[KSYM_NAME_LEN - 1] = '\0'; |
a5c43dae AD |
364 | |
365 | if (is_ksym_addr(addr)) { | |
366 | unsigned long pos; | |
367 | ||
368 | pos = get_symbol_pos(addr, size, offset); | |
369 | /* Grab name */ | |
e3f26752 CG |
370 | kallsyms_expand_symbol(get_symbol_offset(pos), |
371 | name, KSYM_NAME_LEN); | |
a5c43dae AD |
372 | modname[0] = '\0'; |
373 | return 0; | |
374 | } | |
ad6ccfad | 375 | /* See if it's in a module. */ |
a5c43dae AD |
376 | return lookup_module_symbol_attrs(addr, size, offset, modname, name); |
377 | } | |
378 | ||
42e38083 | 379 | /* Look up a kernel symbol and return it in a text buffer. */ |
0f77a8d3 | 380 | static int __sprint_symbol(char *buffer, unsigned long address, |
4796dd20 | 381 | int symbol_offset, int add_offset) |
1da177e4 LT |
382 | { |
383 | char *modname; | |
384 | const char *name; | |
385 | unsigned long offset, size; | |
966c8c12 | 386 | int len; |
1da177e4 | 387 | |
0f77a8d3 | 388 | address += symbol_offset; |
966c8c12 | 389 | name = kallsyms_lookup(address, &size, &offset, &modname, buffer); |
1da177e4 | 390 | if (!name) |
b86280aa | 391 | return sprintf(buffer, "0x%lx", address - symbol_offset); |
19769b76 | 392 | |
966c8c12 HD |
393 | if (name != buffer) |
394 | strcpy(buffer, name); | |
395 | len = strlen(buffer); | |
0f77a8d3 | 396 | offset -= symbol_offset; |
966c8c12 | 397 | |
4796dd20 SB |
398 | if (add_offset) |
399 | len += sprintf(buffer + len, "+%#lx/%#lx", offset, size); | |
400 | ||
19769b76 | 401 | if (modname) |
4796dd20 | 402 | len += sprintf(buffer + len, " [%s]", modname); |
966c8c12 HD |
403 | |
404 | return len; | |
42e38083 | 405 | } |
0f77a8d3 NK |
406 | |
407 | /** | |
408 | * sprint_symbol - Look up a kernel symbol and return it in a text buffer | |
409 | * @buffer: buffer to be stored | |
410 | * @address: address to lookup | |
411 | * | |
412 | * This function looks up a kernel symbol with @address and stores its name, | |
413 | * offset, size and module name to @buffer if possible. If no symbol was found, | |
414 | * just saves its @address as is. | |
415 | * | |
416 | * This function returns the number of bytes stored in @buffer. | |
417 | */ | |
418 | int sprint_symbol(char *buffer, unsigned long address) | |
419 | { | |
4796dd20 | 420 | return __sprint_symbol(buffer, address, 0, 1); |
0f77a8d3 | 421 | } |
ad6ccfad | 422 | EXPORT_SYMBOL_GPL(sprint_symbol); |
42e38083 | 423 | |
4796dd20 SB |
424 | /** |
425 | * sprint_symbol_no_offset - Look up a kernel symbol and return it in a text buffer | |
426 | * @buffer: buffer to be stored | |
427 | * @address: address to lookup | |
428 | * | |
429 | * This function looks up a kernel symbol with @address and stores its name | |
430 | * and module name to @buffer if possible. If no symbol was found, just saves | |
431 | * its @address as is. | |
432 | * | |
433 | * This function returns the number of bytes stored in @buffer. | |
434 | */ | |
435 | int sprint_symbol_no_offset(char *buffer, unsigned long address) | |
436 | { | |
437 | return __sprint_symbol(buffer, address, 0, 0); | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(sprint_symbol_no_offset); | |
440 | ||
0f77a8d3 NK |
441 | /** |
442 | * sprint_backtrace - Look up a backtrace symbol and return it in a text buffer | |
443 | * @buffer: buffer to be stored | |
444 | * @address: address to lookup | |
445 | * | |
446 | * This function is for stack backtrace and does the same thing as | |
447 | * sprint_symbol() but with modified/decreased @address. If there is a | |
448 | * tail-call to the function marked "noreturn", gcc optimized out code after | |
449 | * the call so that the stack-saved return address could point outside of the | |
450 | * caller. This function ensures that kallsyms will find the original caller | |
451 | * by decreasing @address. | |
452 | * | |
453 | * This function returns the number of bytes stored in @buffer. | |
454 | */ | |
455 | int sprint_backtrace(char *buffer, unsigned long address) | |
456 | { | |
4796dd20 | 457 | return __sprint_symbol(buffer, address, -1, 1); |
0f77a8d3 NK |
458 | } |
459 | ||
42e38083 RP |
460 | /* Look up a kernel symbol and print it to the kernel messages. */ |
461 | void __print_symbol(const char *fmt, unsigned long address) | |
462 | { | |
463 | char buffer[KSYM_SYMBOL_LEN]; | |
464 | ||
465 | sprint_symbol(buffer, address); | |
466 | ||
1da177e4 LT |
467 | printk(fmt, buffer); |
468 | } | |
ad6ccfad | 469 | EXPORT_SYMBOL(__print_symbol); |
1da177e4 LT |
470 | |
471 | /* To avoid using get_symbol_offset for every symbol, we carry prefix along. */ | |
ad6ccfad | 472 | struct kallsym_iter { |
1da177e4 | 473 | loff_t pos; |
1da177e4 | 474 | unsigned long value; |
ad6ccfad | 475 | unsigned int nameoff; /* If iterating in core kernel symbols. */ |
1da177e4 | 476 | char type; |
9281acea TH |
477 | char name[KSYM_NAME_LEN]; |
478 | char module_name[MODULE_NAME_LEN]; | |
ea07890a | 479 | int exported; |
1da177e4 LT |
480 | }; |
481 | ||
1da177e4 LT |
482 | static int get_ksymbol_mod(struct kallsym_iter *iter) |
483 | { | |
ea07890a AD |
484 | if (module_get_kallsym(iter->pos - kallsyms_num_syms, &iter->value, |
485 | &iter->type, iter->name, iter->module_name, | |
486 | &iter->exported) < 0) | |
1da177e4 | 487 | return 0; |
1da177e4 LT |
488 | return 1; |
489 | } | |
490 | ||
491 | /* Returns space to next name. */ | |
492 | static unsigned long get_ksymbol_core(struct kallsym_iter *iter) | |
493 | { | |
494 | unsigned off = iter->nameoff; | |
495 | ||
ea07890a | 496 | iter->module_name[0] = '\0'; |
2213e9a6 | 497 | iter->value = kallsyms_sym_address(iter->pos); |
1da177e4 LT |
498 | |
499 | iter->type = kallsyms_get_symbol_type(off); | |
500 | ||
e3f26752 | 501 | off = kallsyms_expand_symbol(off, iter->name, ARRAY_SIZE(iter->name)); |
1da177e4 LT |
502 | |
503 | return off - iter->nameoff; | |
504 | } | |
505 | ||
506 | static void reset_iter(struct kallsym_iter *iter, loff_t new_pos) | |
507 | { | |
508 | iter->name[0] = '\0'; | |
509 | iter->nameoff = get_symbol_offset(new_pos); | |
510 | iter->pos = new_pos; | |
511 | } | |
512 | ||
513 | /* Returns false if pos at or past end of file. */ | |
514 | static int update_iter(struct kallsym_iter *iter, loff_t pos) | |
515 | { | |
516 | /* Module symbols can be accessed randomly. */ | |
517 | if (pos >= kallsyms_num_syms) { | |
518 | iter->pos = pos; | |
519 | return get_ksymbol_mod(iter); | |
520 | } | |
ad6ccfad | 521 | |
1da177e4 LT |
522 | /* If we're not on the desired position, reset to new position. */ |
523 | if (pos != iter->pos) | |
524 | reset_iter(iter, pos); | |
525 | ||
526 | iter->nameoff += get_ksymbol_core(iter); | |
527 | iter->pos++; | |
528 | ||
529 | return 1; | |
530 | } | |
531 | ||
532 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
533 | { | |
534 | (*pos)++; | |
535 | ||
536 | if (!update_iter(m->private, *pos)) | |
537 | return NULL; | |
538 | return p; | |
539 | } | |
540 | ||
541 | static void *s_start(struct seq_file *m, loff_t *pos) | |
542 | { | |
543 | if (!update_iter(m->private, *pos)) | |
544 | return NULL; | |
545 | return m->private; | |
546 | } | |
547 | ||
548 | static void s_stop(struct seq_file *m, void *p) | |
549 | { | |
550 | } | |
551 | ||
552 | static int s_show(struct seq_file *m, void *p) | |
553 | { | |
554 | struct kallsym_iter *iter = m->private; | |
555 | ||
ad6ccfad | 556 | /* Some debugging symbols have no name. Ignore them. */ |
1da177e4 LT |
557 | if (!iter->name[0]) |
558 | return 0; | |
559 | ||
ea07890a AD |
560 | if (iter->module_name[0]) { |
561 | char type; | |
562 | ||
ad6ccfad MK |
563 | /* |
564 | * Label it "global" if it is exported, | |
565 | * "local" if not exported. | |
566 | */ | |
ea07890a AD |
567 | type = iter->exported ? toupper(iter->type) : |
568 | tolower(iter->type); | |
9f36e2c4 KC |
569 | seq_printf(m, "%pK %c %s\t[%s]\n", (void *)iter->value, |
570 | type, iter->name, iter->module_name); | |
ea07890a | 571 | } else |
9f36e2c4 KC |
572 | seq_printf(m, "%pK %c %s\n", (void *)iter->value, |
573 | iter->type, iter->name); | |
1da177e4 LT |
574 | return 0; |
575 | } | |
576 | ||
15ad7cdc | 577 | static const struct seq_operations kallsyms_op = { |
1da177e4 LT |
578 | .start = s_start, |
579 | .next = s_next, | |
580 | .stop = s_stop, | |
581 | .show = s_show | |
582 | }; | |
583 | ||
584 | static int kallsyms_open(struct inode *inode, struct file *file) | |
585 | { | |
ad6ccfad MK |
586 | /* |
587 | * We keep iterator in m->private, since normal case is to | |
1da177e4 | 588 | * s_start from where we left off, so we avoid doing |
ad6ccfad MK |
589 | * using get_symbol_offset for every symbol. |
590 | */ | |
1da177e4 | 591 | struct kallsym_iter *iter; |
0049f26a | 592 | iter = __seq_open_private(file, &kallsyms_op, sizeof(*iter)); |
1da177e4 LT |
593 | if (!iter) |
594 | return -ENOMEM; | |
595 | reset_iter(iter, 0); | |
596 | ||
0049f26a | 597 | return 0; |
1da177e4 LT |
598 | } |
599 | ||
67fc4e0c JW |
600 | #ifdef CONFIG_KGDB_KDB |
601 | const char *kdb_walk_kallsyms(loff_t *pos) | |
602 | { | |
603 | static struct kallsym_iter kdb_walk_kallsyms_iter; | |
604 | if (*pos == 0) { | |
605 | memset(&kdb_walk_kallsyms_iter, 0, | |
606 | sizeof(kdb_walk_kallsyms_iter)); | |
607 | reset_iter(&kdb_walk_kallsyms_iter, 0); | |
608 | } | |
609 | while (1) { | |
610 | if (!update_iter(&kdb_walk_kallsyms_iter, *pos)) | |
611 | return NULL; | |
612 | ++*pos; | |
613 | /* Some debugging symbols have no name. Ignore them. */ | |
614 | if (kdb_walk_kallsyms_iter.name[0]) | |
615 | return kdb_walk_kallsyms_iter.name; | |
616 | } | |
617 | } | |
618 | #endif /* CONFIG_KGDB_KDB */ | |
619 | ||
15ad7cdc | 620 | static const struct file_operations kallsyms_operations = { |
1da177e4 LT |
621 | .open = kallsyms_open, |
622 | .read = seq_read, | |
623 | .llseek = seq_lseek, | |
5a0c6a0d | 624 | .release = seq_release_private, |
1da177e4 LT |
625 | }; |
626 | ||
627 | static int __init kallsyms_init(void) | |
628 | { | |
33e0d57f | 629 | proc_create("kallsyms", 0444, NULL, &kallsyms_operations); |
1da177e4 LT |
630 | return 0; |
631 | } | |
ad6ccfad | 632 | device_initcall(kallsyms_init); |