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Commit | Line | Data |
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1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
382168f4 | 5 | * Copyright 2006 Sam Ravnborg |
1da177e4 LT |
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" | |
b817f6fe | 16 | #include "../../include/linux/license.h" |
1da177e4 LT |
17 | |
18 | /* Are we using CONFIG_MODVERSIONS? */ | |
19 | int modversions = 0; | |
20 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
21 | int have_vmlinux = 0; | |
22 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
23 | static int all_versions = 0; | |
040fcc81 SR |
24 | /* If we are modposting external module set to 1 */ |
25 | static int external_module = 0; | |
bd5cbced RP |
26 | /* How a symbol is exported */ |
27 | enum export {export_plain, export_gpl, export_gpl_future, export_unknown}; | |
1da177e4 | 28 | |
5c3ead8c | 29 | void fatal(const char *fmt, ...) |
1da177e4 LT |
30 | { |
31 | va_list arglist; | |
32 | ||
33 | fprintf(stderr, "FATAL: "); | |
34 | ||
35 | va_start(arglist, fmt); | |
36 | vfprintf(stderr, fmt, arglist); | |
37 | va_end(arglist); | |
38 | ||
39 | exit(1); | |
40 | } | |
41 | ||
5c3ead8c | 42 | void warn(const char *fmt, ...) |
1da177e4 LT |
43 | { |
44 | va_list arglist; | |
45 | ||
46 | fprintf(stderr, "WARNING: "); | |
47 | ||
48 | va_start(arglist, fmt); | |
49 | vfprintf(stderr, fmt, arglist); | |
50 | va_end(arglist); | |
51 | } | |
52 | ||
040fcc81 SR |
53 | static int is_vmlinux(const char *modname) |
54 | { | |
55 | const char *myname; | |
56 | ||
57 | if ((myname = strrchr(modname, '/'))) | |
58 | myname++; | |
59 | else | |
60 | myname = modname; | |
61 | ||
62 | return strcmp(myname, "vmlinux") == 0; | |
63 | } | |
64 | ||
1da177e4 LT |
65 | void *do_nofail(void *ptr, const char *expr) |
66 | { | |
67 | if (!ptr) { | |
68 | fatal("modpost: Memory allocation failure: %s.\n", expr); | |
69 | } | |
70 | return ptr; | |
71 | } | |
72 | ||
73 | /* A list of all modules we processed */ | |
74 | ||
75 | static struct module *modules; | |
76 | ||
5c3ead8c | 77 | static struct module *find_module(char *modname) |
1da177e4 LT |
78 | { |
79 | struct module *mod; | |
80 | ||
81 | for (mod = modules; mod; mod = mod->next) | |
82 | if (strcmp(mod->name, modname) == 0) | |
83 | break; | |
84 | return mod; | |
85 | } | |
86 | ||
5c3ead8c | 87 | static struct module *new_module(char *modname) |
1da177e4 LT |
88 | { |
89 | struct module *mod; | |
90 | char *p, *s; | |
62070fa4 | 91 | |
1da177e4 LT |
92 | mod = NOFAIL(malloc(sizeof(*mod))); |
93 | memset(mod, 0, sizeof(*mod)); | |
94 | p = NOFAIL(strdup(modname)); | |
95 | ||
96 | /* strip trailing .o */ | |
97 | if ((s = strrchr(p, '.')) != NULL) | |
98 | if (strcmp(s, ".o") == 0) | |
99 | *s = '\0'; | |
100 | ||
101 | /* add to list */ | |
102 | mod->name = p; | |
b817f6fe | 103 | mod->gpl_compatible = -1; |
1da177e4 LT |
104 | mod->next = modules; |
105 | modules = mod; | |
106 | ||
107 | return mod; | |
108 | } | |
109 | ||
110 | /* A hash of all exported symbols, | |
111 | * struct symbol is also used for lists of unresolved symbols */ | |
112 | ||
113 | #define SYMBOL_HASH_SIZE 1024 | |
114 | ||
115 | struct symbol { | |
116 | struct symbol *next; | |
117 | struct module *module; | |
118 | unsigned int crc; | |
119 | int crc_valid; | |
120 | unsigned int weak:1; | |
040fcc81 SR |
121 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
122 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
123 | * (only for external modules) **/ | |
8e70c458 | 124 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 125 | enum export export; /* Type of export */ |
1da177e4 LT |
126 | char name[0]; |
127 | }; | |
128 | ||
129 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
130 | ||
131 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
132 | static inline unsigned int tdb_hash(const char *name) | |
133 | { | |
134 | unsigned value; /* Used to compute the hash value. */ | |
135 | unsigned i; /* Used to cycle through random values. */ | |
136 | ||
137 | /* Set the initial value from the key size. */ | |
138 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) | |
139 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); | |
140 | ||
141 | return (1103515243 * value + 12345); | |
142 | } | |
143 | ||
5c3ead8c SR |
144 | /** |
145 | * Allocate a new symbols for use in the hash of exported symbols or | |
146 | * the list of unresolved symbols per module | |
147 | **/ | |
148 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
149 | struct symbol *next) | |
1da177e4 LT |
150 | { |
151 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
152 | ||
153 | memset(s, 0, sizeof(*s)); | |
154 | strcpy(s->name, name); | |
155 | s->weak = weak; | |
156 | s->next = next; | |
157 | return s; | |
158 | } | |
159 | ||
160 | /* For the hash of exported symbols */ | |
bd5cbced RP |
161 | static struct symbol *new_symbol(const char *name, struct module *module, |
162 | enum export export) | |
1da177e4 LT |
163 | { |
164 | unsigned int hash; | |
165 | struct symbol *new; | |
166 | ||
167 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
168 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
169 | new->module = module; | |
bd5cbced | 170 | new->export = export; |
040fcc81 | 171 | return new; |
1da177e4 LT |
172 | } |
173 | ||
5c3ead8c | 174 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
175 | { |
176 | struct symbol *s; | |
177 | ||
178 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
179 | if (name[0] == '.') | |
180 | name++; | |
181 | ||
182 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { | |
183 | if (strcmp(s->name, name) == 0) | |
184 | return s; | |
185 | } | |
186 | return NULL; | |
187 | } | |
188 | ||
bd5cbced RP |
189 | static struct { |
190 | const char *str; | |
191 | enum export export; | |
192 | } export_list[] = { | |
193 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
194 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, | |
195 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, | |
196 | { .str = "(unknown)", .export = export_unknown }, | |
197 | }; | |
198 | ||
199 | ||
200 | static const char *export_str(enum export ex) | |
201 | { | |
202 | return export_list[ex].str; | |
203 | } | |
204 | ||
205 | static enum export export_no(const char * s) | |
206 | { | |
207 | int i; | |
208 | for (i = 0; export_list[i].export != export_unknown; i++) { | |
209 | if (strcmp(export_list[i].str, s) == 0) | |
210 | return export_list[i].export; | |
211 | } | |
212 | return export_unknown; | |
213 | } | |
214 | ||
215 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
216 | { | |
217 | if (sec == elf->export_sec) | |
218 | return export_plain; | |
219 | else if (sec == elf->export_gpl_sec) | |
220 | return export_gpl; | |
221 | else if (sec == elf->export_gpl_future_sec) | |
222 | return export_gpl_future; | |
223 | else | |
224 | return export_unknown; | |
225 | } | |
226 | ||
5c3ead8c SR |
227 | /** |
228 | * Add an exported symbol - it may have already been added without a | |
229 | * CRC, in this case just update the CRC | |
230 | **/ | |
bd5cbced RP |
231 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
232 | enum export export) | |
1da177e4 LT |
233 | { |
234 | struct symbol *s = find_symbol(name); | |
235 | ||
236 | if (!s) { | |
bd5cbced | 237 | s = new_symbol(name, mod, export); |
8e70c458 SR |
238 | } else { |
239 | if (!s->preloaded) { | |
7b75b13c | 240 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
241 | "was in %s%s\n", mod->name, name, |
242 | s->module->name, | |
243 | is_vmlinux(s->module->name) ?"":".ko"); | |
244 | } | |
1da177e4 | 245 | } |
8e70c458 | 246 | s->preloaded = 0; |
040fcc81 SR |
247 | s->vmlinux = is_vmlinux(mod->name); |
248 | s->kernel = 0; | |
bd5cbced | 249 | s->export = export; |
040fcc81 SR |
250 | return s; |
251 | } | |
252 | ||
253 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 254 | unsigned int crc, enum export export) |
040fcc81 SR |
255 | { |
256 | struct symbol *s = find_symbol(name); | |
257 | ||
258 | if (!s) | |
bd5cbced | 259 | s = new_symbol(name, mod, export); |
040fcc81 SR |
260 | s->crc = crc; |
261 | s->crc_valid = 1; | |
1da177e4 LT |
262 | } |
263 | ||
5c3ead8c | 264 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
265 | { |
266 | struct stat st; | |
267 | void *map; | |
268 | int fd; | |
269 | ||
270 | fd = open(filename, O_RDONLY); | |
271 | if (fd < 0 || fstat(fd, &st) != 0) | |
272 | return NULL; | |
273 | ||
274 | *size = st.st_size; | |
275 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
276 | close(fd); | |
277 | ||
278 | if (map == MAP_FAILED) | |
279 | return NULL; | |
280 | return map; | |
281 | } | |
282 | ||
5c3ead8c SR |
283 | /** |
284 | * Return a copy of the next line in a mmap'ed file. | |
285 | * spaces in the beginning of the line is trimmed away. | |
286 | * Return a pointer to a static buffer. | |
287 | **/ | |
288 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) | |
1da177e4 LT |
289 | { |
290 | static char line[4096]; | |
291 | int skip = 1; | |
292 | size_t len = 0; | |
293 | signed char *p = (signed char *)file + *pos; | |
294 | char *s = line; | |
295 | ||
296 | for (; *pos < size ; (*pos)++) | |
297 | { | |
298 | if (skip && isspace(*p)) { | |
299 | p++; | |
300 | continue; | |
301 | } | |
302 | skip = 0; | |
303 | if (*p != '\n' && (*pos < size)) { | |
304 | len++; | |
305 | *s++ = *p++; | |
306 | if (len > 4095) | |
307 | break; /* Too long, stop */ | |
308 | } else { | |
309 | /* End of string */ | |
310 | *s = '\0'; | |
311 | return line; | |
312 | } | |
313 | } | |
314 | /* End of buffer */ | |
315 | return NULL; | |
316 | } | |
317 | ||
5c3ead8c | 318 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
319 | { |
320 | munmap(file, size); | |
321 | } | |
322 | ||
5c3ead8c | 323 | static void parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
324 | { |
325 | unsigned int i; | |
326 | Elf_Ehdr *hdr = info->hdr; | |
327 | Elf_Shdr *sechdrs; | |
328 | Elf_Sym *sym; | |
329 | ||
330 | hdr = grab_file(filename, &info->size); | |
331 | if (!hdr) { | |
332 | perror(filename); | |
333 | abort(); | |
334 | } | |
335 | info->hdr = hdr; | |
336 | if (info->size < sizeof(*hdr)) | |
337 | goto truncated; | |
338 | ||
339 | /* Fix endianness in ELF header */ | |
340 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
341 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
342 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
343 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
344 | sechdrs = (void *)hdr + hdr->e_shoff; | |
345 | info->sechdrs = sechdrs; | |
346 | ||
347 | /* Fix endianness in section headers */ | |
348 | for (i = 0; i < hdr->e_shnum; i++) { | |
349 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
350 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
351 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
352 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
353 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
354 | } | |
355 | /* Find symbol table. */ | |
356 | for (i = 1; i < hdr->e_shnum; i++) { | |
357 | const char *secstrings | |
358 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 359 | const char *secname; |
1da177e4 LT |
360 | |
361 | if (sechdrs[i].sh_offset > info->size) | |
362 | goto truncated; | |
bd5cbced RP |
363 | secname = secstrings + sechdrs[i].sh_name; |
364 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
365 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
366 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
367 | } else if (strcmp(secname, "__ksymtab") == 0) |
368 | info->export_sec = i; | |
369 | else if (strcmp(secname, "__ksymtab_gpl") == 0) | |
370 | info->export_gpl_sec = i; | |
371 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) | |
372 | info->export_gpl_future_sec = i; | |
373 | ||
1da177e4 LT |
374 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
375 | continue; | |
376 | ||
377 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 378 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 379 | + sechdrs[i].sh_size; |
62070fa4 | 380 | info->strtab = (void *)hdr + |
1da177e4 LT |
381 | sechdrs[sechdrs[i].sh_link].sh_offset; |
382 | } | |
383 | if (!info->symtab_start) { | |
cb80514d | 384 | fatal("%s has no symtab?\n", filename); |
1da177e4 LT |
385 | } |
386 | /* Fix endianness in symbols */ | |
387 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
388 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
389 | sym->st_name = TO_NATIVE(sym->st_name); | |
390 | sym->st_value = TO_NATIVE(sym->st_value); | |
391 | sym->st_size = TO_NATIVE(sym->st_size); | |
392 | } | |
393 | return; | |
394 | ||
395 | truncated: | |
cb80514d | 396 | fatal("%s is truncated.\n", filename); |
1da177e4 LT |
397 | } |
398 | ||
5c3ead8c | 399 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
400 | { |
401 | release_file(info->hdr, info->size); | |
402 | } | |
403 | ||
f7b05e64 LY |
404 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
405 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 406 | |
5c3ead8c SR |
407 | static void handle_modversions(struct module *mod, struct elf_info *info, |
408 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
409 | { |
410 | unsigned int crc; | |
bd5cbced | 411 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
412 | |
413 | switch (sym->st_shndx) { | |
414 | case SHN_COMMON: | |
cb80514d | 415 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
416 | break; |
417 | case SHN_ABS: | |
418 | /* CRC'd symbol */ | |
419 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
420 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
421 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
422 | export); | |
1da177e4 LT |
423 | } |
424 | break; | |
425 | case SHN_UNDEF: | |
426 | /* undefined symbol */ | |
427 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
428 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
429 | break; | |
430 | /* ignore global offset table */ | |
431 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
432 | break; | |
433 | /* ignore __this_module, it will be resolved shortly */ | |
434 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
435 | break; | |
8d529014 BC |
436 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
437 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
438 | /* add compatibility with older glibc */ | |
439 | #ifndef STT_SPARC_REGISTER | |
440 | #define STT_SPARC_REGISTER STT_REGISTER | |
441 | #endif | |
1da177e4 LT |
442 | if (info->hdr->e_machine == EM_SPARC || |
443 | info->hdr->e_machine == EM_SPARCV9) { | |
444 | /* Ignore register directives. */ | |
8d529014 | 445 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 446 | break; |
62070fa4 SR |
447 | if (symname[0] == '.') { |
448 | char *munged = strdup(symname); | |
449 | munged[0] = '_'; | |
450 | munged[1] = toupper(munged[1]); | |
451 | symname = munged; | |
452 | } | |
1da177e4 LT |
453 | } |
454 | #endif | |
62070fa4 | 455 | |
1da177e4 LT |
456 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
457 | strlen(MODULE_SYMBOL_PREFIX)) == 0) | |
458 | mod->unres = alloc_symbol(symname + | |
459 | strlen(MODULE_SYMBOL_PREFIX), | |
460 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
461 | mod->unres); | |
462 | break; | |
463 | default: | |
464 | /* All exported symbols */ | |
465 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
466 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
467 | export); | |
1da177e4 LT |
468 | } |
469 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
470 | mod->has_init = 1; | |
471 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
472 | mod->has_cleanup = 1; | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
5c3ead8c SR |
477 | /** |
478 | * Parse tag=value strings from .modinfo section | |
479 | **/ | |
1da177e4 LT |
480 | static char *next_string(char *string, unsigned long *secsize) |
481 | { | |
482 | /* Skip non-zero chars */ | |
483 | while (string[0]) { | |
484 | string++; | |
485 | if ((*secsize)-- <= 1) | |
486 | return NULL; | |
487 | } | |
488 | ||
489 | /* Skip any zero padding. */ | |
490 | while (!string[0]) { | |
491 | string++; | |
492 | if ((*secsize)-- <= 1) | |
493 | return NULL; | |
494 | } | |
495 | return string; | |
496 | } | |
497 | ||
b817f6fe SR |
498 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
499 | const char *tag, char *info) | |
1da177e4 LT |
500 | { |
501 | char *p; | |
502 | unsigned int taglen = strlen(tag); | |
503 | unsigned long size = modinfo_len; | |
504 | ||
b817f6fe SR |
505 | if (info) { |
506 | size -= info - (char *)modinfo; | |
507 | modinfo = next_string(info, &size); | |
508 | } | |
509 | ||
1da177e4 LT |
510 | for (p = modinfo; p; p = next_string(p, &size)) { |
511 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
512 | return p + taglen + 1; | |
513 | } | |
514 | return NULL; | |
515 | } | |
516 | ||
b817f6fe SR |
517 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
518 | const char *tag) | |
519 | ||
520 | { | |
521 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
522 | } | |
523 | ||
4c8fbca5 SR |
524 | /** |
525 | * Test if string s ends in string sub | |
526 | * return 0 if match | |
527 | **/ | |
528 | static int strrcmp(const char *s, const char *sub) | |
529 | { | |
530 | int slen, sublen; | |
62070fa4 | 531 | |
4c8fbca5 SR |
532 | if (!s || !sub) |
533 | return 1; | |
62070fa4 | 534 | |
4c8fbca5 SR |
535 | slen = strlen(s); |
536 | sublen = strlen(sub); | |
62070fa4 | 537 | |
4c8fbca5 SR |
538 | if ((slen == 0) || (sublen == 0)) |
539 | return 1; | |
540 | ||
541 | if (sublen > slen) | |
542 | return 1; | |
543 | ||
544 | return memcmp(s + slen - sublen, sub, sublen); | |
545 | } | |
546 | ||
547 | /** | |
548 | * Whitelist to allow certain references to pass with no warning. | |
549 | * Pattern 1: | |
550 | * If a module parameter is declared __initdata and permissions=0 | |
551 | * then this is legal despite the warning generated. | |
552 | * We cannot see value of permissions here, so just ignore | |
553 | * this pattern. | |
554 | * The pattern is identified by: | |
555 | * tosec = .init.data | |
9209aed0 | 556 | * fromsec = .data* |
4c8fbca5 | 557 | * atsym =__param* |
62070fa4 | 558 | * |
4c8fbca5 | 559 | * Pattern 2: |
72ee59b5 | 560 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
561 | * add, remove, probe functions etc. |
562 | * These functions may often be marked __init and we do not want to | |
563 | * warn here. | |
564 | * the pattern is identified by: | |
5ecdd0f6 | 565 | * tosec = .init.text | .exit.text | .init.data |
4c8fbca5 | 566 | * fromsec = .data |
72ee59b5 | 567 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one |
4c8fbca5 SR |
568 | **/ |
569 | static int secref_whitelist(const char *tosec, const char *fromsec, | |
5ecdd0f6 | 570 | const char *atsym) |
4c8fbca5 SR |
571 | { |
572 | int f1 = 1, f2 = 1; | |
573 | const char **s; | |
574 | const char *pat2sym[] = { | |
72ee59b5 | 575 | "driver", |
5ecdd0f6 SR |
576 | "_template", /* scsi uses *_template a lot */ |
577 | "_sht", /* scsi also used *_sht to some extent */ | |
4c8fbca5 SR |
578 | "_ops", |
579 | "_probe", | |
580 | "_probe_one", | |
581 | NULL | |
582 | }; | |
62070fa4 | 583 | |
4c8fbca5 SR |
584 | /* Check for pattern 1 */ |
585 | if (strcmp(tosec, ".init.data") != 0) | |
586 | f1 = 0; | |
9209aed0 | 587 | if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
4c8fbca5 SR |
588 | f1 = 0; |
589 | if (strncmp(atsym, "__param", strlen("__param")) != 0) | |
590 | f1 = 0; | |
591 | ||
592 | if (f1) | |
593 | return f1; | |
594 | ||
595 | /* Check for pattern 2 */ | |
62070fa4 | 596 | if ((strcmp(tosec, ".init.text") != 0) && |
5ecdd0f6 SR |
597 | (strcmp(tosec, ".exit.text") != 0) && |
598 | (strcmp(tosec, ".init.data") != 0)) | |
4c8fbca5 SR |
599 | f2 = 0; |
600 | if (strcmp(fromsec, ".data") != 0) | |
601 | f2 = 0; | |
602 | ||
603 | for (s = pat2sym; *s; s++) | |
604 | if (strrcmp(atsym, *s) == 0) | |
605 | f1 = 1; | |
606 | ||
607 | return f1 && f2; | |
608 | } | |
609 | ||
93684d3b SR |
610 | /** |
611 | * Find symbol based on relocation record info. | |
612 | * In some cases the symbol supplied is a valid symbol so | |
613 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
614 | * In other cases the symbol needs to be looked up in the symbol table | |
615 | * based on section and address. | |
616 | * **/ | |
617 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
618 | Elf_Sym *relsym) | |
619 | { | |
620 | Elf_Sym *sym; | |
621 | ||
622 | if (relsym->st_name != 0) | |
623 | return relsym; | |
624 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
625 | if (sym->st_shndx != relsym->st_shndx) | |
626 | continue; | |
627 | if (sym->st_value == addr) | |
628 | return sym; | |
629 | } | |
630 | return NULL; | |
631 | } | |
632 | ||
b39927cf | 633 | /* |
43c74d17 SR |
634 | * Find symbols before or equal addr and after addr - in the section sec. |
635 | * If we find two symbols with equal offset prefer one with a valid name. | |
636 | * The ELF format may have a better way to detect what type of symbol | |
637 | * it is, but this works for now. | |
b39927cf SR |
638 | **/ |
639 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
640 | const char *sec, | |
641 | Elf_Sym **before, Elf_Sym **after) | |
642 | { | |
643 | Elf_Sym *sym; | |
644 | Elf_Ehdr *hdr = elf->hdr; | |
645 | Elf_Addr beforediff = ~0; | |
646 | Elf_Addr afterdiff = ~0; | |
647 | const char *secstrings = (void *)hdr + | |
648 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 649 | |
b39927cf SR |
650 | *before = NULL; |
651 | *after = NULL; | |
652 | ||
653 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
654 | const char *symsec; | |
655 | ||
656 | if (sym->st_shndx >= SHN_LORESERVE) | |
657 | continue; | |
658 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
659 | if (strcmp(symsec, sec) != 0) | |
660 | continue; | |
661 | if (sym->st_value <= addr) { | |
662 | if ((addr - sym->st_value) < beforediff) { | |
663 | beforediff = addr - sym->st_value; | |
664 | *before = sym; | |
665 | } | |
43c74d17 SR |
666 | else if ((addr - sym->st_value) == beforediff) { |
667 | /* equal offset, valid name? */ | |
668 | const char *name = elf->strtab + sym->st_name; | |
669 | if (name && strlen(name)) | |
670 | *before = sym; | |
671 | } | |
b39927cf SR |
672 | } |
673 | else | |
674 | { | |
675 | if ((sym->st_value - addr) < afterdiff) { | |
676 | afterdiff = sym->st_value - addr; | |
677 | *after = sym; | |
678 | } | |
43c74d17 SR |
679 | else if ((sym->st_value - addr) == afterdiff) { |
680 | /* equal offset, valid name? */ | |
681 | const char *name = elf->strtab + sym->st_name; | |
682 | if (name && strlen(name)) | |
683 | *after = sym; | |
684 | } | |
b39927cf SR |
685 | } |
686 | } | |
687 | } | |
688 | ||
689 | /** | |
690 | * Print a warning about a section mismatch. | |
691 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 692 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
693 | **/ |
694 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
695 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
696 | { | |
93684d3b SR |
697 | const char *refsymname = ""; |
698 | Elf_Sym *before, *after; | |
699 | Elf_Sym *refsym; | |
b39927cf SR |
700 | Elf_Ehdr *hdr = elf->hdr; |
701 | Elf_Shdr *sechdrs = elf->sechdrs; | |
702 | const char *secstrings = (void *)hdr + | |
703 | sechdrs[hdr->e_shstrndx].sh_offset; | |
704 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 705 | |
b39927cf SR |
706 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
707 | ||
93684d3b SR |
708 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
709 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
710 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
711 | |
712 | /* check whitelist - we may ignore it */ | |
62070fa4 | 713 | if (before && |
4c8fbca5 SR |
714 | secref_whitelist(secname, fromsec, elf->strtab + before->st_name)) |
715 | return; | |
62070fa4 | 716 | |
b39927cf | 717 | if (before && after) { |
93684d3b SR |
718 | warn("%s - Section mismatch: reference to %s:%s from %s " |
719 | "between '%s' (at offset 0x%llx) and '%s'\n", | |
720 | modname, secname, refsymname, fromsec, | |
b39927cf | 721 | elf->strtab + before->st_name, |
93684d3b | 722 | (long long)r.r_offset, |
b39927cf SR |
723 | elf->strtab + after->st_name); |
724 | } else if (before) { | |
93684d3b SR |
725 | warn("%s - Section mismatch: reference to %s:%s from %s " |
726 | "after '%s' (at offset 0x%llx)\n", | |
62070fa4 | 727 | modname, secname, refsymname, fromsec, |
b39927cf | 728 | elf->strtab + before->st_name, |
93684d3b | 729 | (long long)r.r_offset); |
b39927cf | 730 | } else if (after) { |
93684d3b SR |
731 | warn("%s - Section mismatch: reference to %s:%s from %s " |
732 | "before '%s' (at offset -0x%llx)\n", | |
62070fa4 | 733 | modname, secname, refsymname, fromsec, |
eaaae38c | 734 | elf->strtab + after->st_name, |
93684d3b | 735 | (long long)r.r_offset); |
b39927cf | 736 | } else { |
93684d3b SR |
737 | warn("%s - Section mismatch: reference to %s:%s from %s " |
738 | "(offset 0x%llx)\n", | |
739 | modname, secname, fromsec, refsymname, | |
740 | (long long)r.r_offset); | |
b39927cf SR |
741 | } |
742 | } | |
743 | ||
744 | /** | |
745 | * A module includes a number of sections that are discarded | |
746 | * either when loaded or when used as built-in. | |
747 | * For loaded modules all functions marked __init and all data | |
748 | * marked __initdata will be discarded when the module has been intialized. | |
749 | * Likewise for modules used built-in the sections marked __exit | |
750 | * are discarded because __exit marked function are supposed to be called | |
751 | * only when a moduel is unloaded which never happes for built-in modules. | |
752 | * The check_sec_ref() function traverses all relocation records | |
753 | * to find all references to a section that reference a section that will | |
754 | * be discarded and warns about it. | |
755 | **/ | |
756 | static void check_sec_ref(struct module *mod, const char *modname, | |
757 | struct elf_info *elf, | |
758 | int section(const char*), | |
759 | int section_ref_ok(const char *)) | |
760 | { | |
761 | int i; | |
762 | Elf_Sym *sym; | |
763 | Elf_Ehdr *hdr = elf->hdr; | |
764 | Elf_Shdr *sechdrs = elf->sechdrs; | |
765 | const char *secstrings = (void *)hdr + | |
766 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 767 | |
b39927cf SR |
768 | /* Walk through all sections */ |
769 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
770 | const char *name = secstrings + sechdrs[i].sh_name; |
771 | const char *secname; | |
772 | Elf_Rela r; | |
eae07ac6 | 773 | unsigned int r_sym; |
b39927cf | 774 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
775 | if (sechdrs[i].sh_type == SHT_RELA) { |
776 | Elf_Rela *rela; | |
777 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
778 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
779 | name += strlen(".rela"); | |
780 | if (section_ref_ok(name)) | |
781 | continue; | |
b39927cf | 782 | |
2c1a51f3 AN |
783 | for (rela = start; rela < stop; rela++) { |
784 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
785 | #if KERNEL_ELFCLASS == ELFCLASS64 |
786 | if (hdr->e_machine == EM_MIPS) { | |
787 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
788 | r_sym = TO_NATIVE(r_sym); | |
789 | } else { | |
790 | r.r_info = TO_NATIVE(rela->r_info); | |
791 | r_sym = ELF_R_SYM(r.r_info); | |
792 | } | |
793 | #else | |
794 | r.r_info = TO_NATIVE(rela->r_info); | |
795 | r_sym = ELF_R_SYM(r.r_info); | |
796 | #endif | |
2c1a51f3 | 797 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 798 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
799 | /* Skip special sections */ |
800 | if (sym->st_shndx >= SHN_LORESERVE) | |
801 | continue; | |
802 | ||
803 | secname = secstrings + | |
804 | sechdrs[sym->st_shndx].sh_name; | |
805 | if (section(secname)) | |
806 | warn_sec_mismatch(modname, name, | |
807 | elf, sym, r); | |
808 | } | |
809 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
810 | Elf_Rel *rel; | |
811 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
812 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
813 | name += strlen(".rel"); | |
814 | if (section_ref_ok(name)) | |
b39927cf SR |
815 | continue; |
816 | ||
2c1a51f3 AN |
817 | for (rel = start; rel < stop; rel++) { |
818 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
819 | #if KERNEL_ELFCLASS == ELFCLASS64 |
820 | if (hdr->e_machine == EM_MIPS) { | |
821 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
822 | r_sym = TO_NATIVE(r_sym); | |
823 | } else { | |
824 | r.r_info = TO_NATIVE(rel->r_info); | |
825 | r_sym = ELF_R_SYM(r.r_info); | |
826 | } | |
827 | #else | |
828 | r.r_info = TO_NATIVE(rel->r_info); | |
829 | r_sym = ELF_R_SYM(r.r_info); | |
830 | #endif | |
2c1a51f3 | 831 | r.r_addend = 0; |
eae07ac6 | 832 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
833 | /* Skip special sections */ |
834 | if (sym->st_shndx >= SHN_LORESERVE) | |
835 | continue; | |
836 | ||
837 | secname = secstrings + | |
838 | sechdrs[sym->st_shndx].sh_name; | |
839 | if (section(secname)) | |
840 | warn_sec_mismatch(modname, name, | |
841 | elf, sym, r); | |
842 | } | |
b39927cf SR |
843 | } |
844 | } | |
845 | } | |
846 | ||
847 | /** | |
848 | * Functions used only during module init is marked __init and is stored in | |
849 | * a .init.text section. Likewise data is marked __initdata and stored in | |
850 | * a .init.data section. | |
851 | * If this section is one of these sections return 1 | |
852 | * See include/linux/init.h for the details | |
853 | **/ | |
854 | static int init_section(const char *name) | |
855 | { | |
856 | if (strcmp(name, ".init") == 0) | |
857 | return 1; | |
858 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
859 | return 1; | |
860 | return 0; | |
861 | } | |
862 | ||
863 | /** | |
864 | * Identify sections from which references to a .init section is OK. | |
62070fa4 | 865 | * |
b39927cf SR |
866 | * Unfortunately references to read only data that referenced .init |
867 | * sections had to be excluded. Almost all of these are false | |
868 | * positives, they are created by gcc. The downside of excluding rodata | |
869 | * is that there really are some user references from rodata to | |
870 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 871 | * |
b39927cf SR |
872 | * const struct consw vga_con = { |
873 | * con_startup: vgacon_startup, | |
874 | * | |
875 | * where vgacon_startup is __init. If you want to wade through the false | |
876 | * positives, take out the check for rodata. | |
877 | **/ | |
878 | static int init_section_ref_ok(const char *name) | |
879 | { | |
880 | const char **s; | |
881 | /* Absolute section names */ | |
882 | const char *namelist1[] = { | |
883 | ".init", | |
9209aed0 SR |
884 | ".opd", /* see comment [OPD] at exit_section_ref_ok() */ |
885 | ".toc1", /* used by ppc64 */ | |
b39927cf SR |
886 | ".stab", |
887 | ".rodata", | |
888 | ".text.lock", | |
9209aed0 | 889 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
890 | ".pci_fixup_header", |
891 | ".pci_fixup_final", | |
892 | ".pdr", | |
893 | "__param", | |
35899c57 | 894 | ".smp_locks", |
909252d2 | 895 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
b39927cf SR |
896 | NULL |
897 | }; | |
898 | /* Start of section names */ | |
899 | const char *namelist2[] = { | |
900 | ".init.", | |
901 | ".altinstructions", | |
902 | ".eh_frame", | |
903 | ".debug", | |
904 | NULL | |
905 | }; | |
6e10133f SR |
906 | /* part of section name */ |
907 | const char *namelist3 [] = { | |
908 | ".unwind", /* sample: IA_64.unwind.init.text */ | |
909 | NULL | |
910 | }; | |
911 | ||
b39927cf SR |
912 | for (s = namelist1; *s; s++) |
913 | if (strcmp(*s, name) == 0) | |
914 | return 1; | |
62070fa4 | 915 | for (s = namelist2; *s; s++) |
b39927cf SR |
916 | if (strncmp(*s, name, strlen(*s)) == 0) |
917 | return 1; | |
62070fa4 | 918 | for (s = namelist3; *s; s++) |
e835a39c | 919 | if (strstr(name, *s) != NULL) |
6e10133f | 920 | return 1; |
b39927cf SR |
921 | return 0; |
922 | } | |
923 | ||
924 | /* | |
925 | * Functions used only during module exit is marked __exit and is stored in | |
926 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
927 | * a .exit.data section. | |
928 | * If this section is one of these sections return 1 | |
929 | * See include/linux/init.h for the details | |
930 | **/ | |
931 | static int exit_section(const char *name) | |
932 | { | |
933 | if (strcmp(name, ".exit.text") == 0) | |
934 | return 1; | |
935 | if (strcmp(name, ".exit.data") == 0) | |
936 | return 1; | |
937 | return 0; | |
62070fa4 | 938 | |
b39927cf SR |
939 | } |
940 | ||
941 | /* | |
942 | * Identify sections from which references to a .exit section is OK. | |
62070fa4 | 943 | * |
b39927cf SR |
944 | * [OPD] Keith Ownes <kaos@sgi.com> commented: |
945 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
946 | * section, not the ia64 .opd section. | |
947 | * ia64 .opd should not point to discarded sections. | |
5ecdd0f6 | 948 | * [.rodata] like for .init.text we ignore .rodata references -same reason |
b39927cf SR |
949 | **/ |
950 | static int exit_section_ref_ok(const char *name) | |
951 | { | |
952 | const char **s; | |
953 | /* Absolute section names */ | |
954 | const char *namelist1[] = { | |
955 | ".exit.text", | |
956 | ".exit.data", | |
957 | ".init.text", | |
5ecdd0f6 | 958 | ".rodata", |
b39927cf | 959 | ".opd", /* See comment [OPD] */ |
9209aed0 | 960 | ".toc1", /* used by ppc64 */ |
b39927cf SR |
961 | ".altinstructions", |
962 | ".pdr", | |
9209aed0 | 963 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
964 | ".exitcall.exit", |
965 | ".eh_frame", | |
966 | ".stab", | |
35899c57 | 967 | ".smp_locks", |
909252d2 | 968 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
b39927cf SR |
969 | NULL |
970 | }; | |
971 | /* Start of section names */ | |
972 | const char *namelist2[] = { | |
973 | ".debug", | |
974 | NULL | |
975 | }; | |
6e10133f SR |
976 | /* part of section name */ |
977 | const char *namelist3 [] = { | |
978 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
979 | NULL | |
980 | }; | |
62070fa4 | 981 | |
b39927cf SR |
982 | for (s = namelist1; *s; s++) |
983 | if (strcmp(*s, name) == 0) | |
984 | return 1; | |
62070fa4 | 985 | for (s = namelist2; *s; s++) |
b39927cf SR |
986 | if (strncmp(*s, name, strlen(*s)) == 0) |
987 | return 1; | |
62070fa4 | 988 | for (s = namelist3; *s; s++) |
e835a39c | 989 | if (strstr(name, *s) != NULL) |
6e10133f | 990 | return 1; |
b39927cf SR |
991 | return 0; |
992 | } | |
993 | ||
5c3ead8c | 994 | static void read_symbols(char *modname) |
1da177e4 LT |
995 | { |
996 | const char *symname; | |
997 | char *version; | |
b817f6fe | 998 | char *license; |
1da177e4 LT |
999 | struct module *mod; |
1000 | struct elf_info info = { }; | |
1001 | Elf_Sym *sym; | |
1002 | ||
1003 | parse_elf(&info, modname); | |
1004 | ||
1005 | mod = new_module(modname); | |
1006 | ||
1007 | /* When there's no vmlinux, don't print warnings about | |
1008 | * unresolved symbols (since there'll be too many ;) */ | |
1009 | if (is_vmlinux(modname)) { | |
1da177e4 | 1010 | have_vmlinux = 1; |
1da177e4 LT |
1011 | mod->skip = 1; |
1012 | } | |
1013 | ||
b817f6fe SR |
1014 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1015 | while (license) { | |
1016 | if (license_is_gpl_compatible(license)) | |
1017 | mod->gpl_compatible = 1; | |
1018 | else { | |
1019 | mod->gpl_compatible = 0; | |
1020 | break; | |
1021 | } | |
1022 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1023 | "license", license); | |
1024 | } | |
1025 | ||
1da177e4 LT |
1026 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1027 | symname = info.strtab + sym->st_name; | |
1028 | ||
1029 | handle_modversions(mod, &info, sym, symname); | |
1030 | handle_moddevtable(mod, &info, sym, symname); | |
1031 | } | |
b39927cf SR |
1032 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
1033 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1da177e4 LT |
1034 | |
1035 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1036 | if (version) | |
1037 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1038 | version - (char *)info.hdr); | |
1039 | if (version || (all_versions && !is_vmlinux(modname))) | |
1040 | get_src_version(modname, mod->srcversion, | |
1041 | sizeof(mod->srcversion)-1); | |
1042 | ||
1043 | parse_elf_finish(&info); | |
1044 | ||
1045 | /* Our trick to get versioning for struct_module - it's | |
1046 | * never passed as an argument to an exported function, so | |
1047 | * the automatic versioning doesn't pick it up, but it's really | |
1048 | * important anyhow */ | |
1049 | if (modversions) | |
1050 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1051 | } | |
1052 | ||
1053 | #define SZ 500 | |
1054 | ||
1055 | /* We first write the generated file into memory using the | |
1056 | * following helper, then compare to the file on disk and | |
1057 | * only update the later if anything changed */ | |
1058 | ||
5c3ead8c SR |
1059 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1060 | const char *fmt, ...) | |
1da177e4 LT |
1061 | { |
1062 | char tmp[SZ]; | |
1063 | int len; | |
1064 | va_list ap; | |
62070fa4 | 1065 | |
1da177e4 LT |
1066 | va_start(ap, fmt); |
1067 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1068 | buf_write(buf, tmp, len); |
1da177e4 LT |
1069 | va_end(ap); |
1070 | } | |
1071 | ||
5c3ead8c | 1072 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1073 | { |
1074 | if (buf->size - buf->pos < len) { | |
7670f023 | 1075 | buf->size += len + SZ; |
1da177e4 LT |
1076 | buf->p = realloc(buf->p, buf->size); |
1077 | } | |
1078 | strncpy(buf->p + buf->pos, s, len); | |
1079 | buf->pos += len; | |
1080 | } | |
1081 | ||
b817f6fe SR |
1082 | void check_license(struct module *mod) |
1083 | { | |
1084 | struct symbol *s, *exp; | |
1085 | ||
1086 | for (s = mod->unres; s; s = s->next) { | |
1087 | if (mod->gpl_compatible == 1) { | |
1088 | /* GPL-compatible modules may use all symbols */ | |
1089 | continue; | |
1090 | } | |
1091 | exp = find_symbol(s->name); | |
1092 | if (!exp || exp->module == mod) | |
1093 | continue; | |
1094 | const char *basename = strrchr(mod->name, '/'); | |
1095 | if (basename) | |
1096 | basename++; | |
1097 | switch (exp->export) { | |
1098 | case export_gpl: | |
1099 | fatal("modpost: GPL-incompatible module %s " | |
1100 | "uses GPL-only symbol '%s'\n", | |
1101 | basename ? basename : mod->name, | |
1102 | exp->name); | |
1103 | break; | |
1104 | case export_gpl_future: | |
1105 | warn("modpost: GPL-incompatible module %s " | |
1106 | "uses future GPL-only symbol '%s'\n", | |
1107 | basename ? basename : mod->name, | |
1108 | exp->name); | |
1109 | break; | |
1110 | case export_plain: /* ignore */ break; | |
1111 | case export_unknown: /* ignore */ break; | |
1112 | } | |
1113 | } | |
1114 | } | |
1115 | ||
5c3ead8c SR |
1116 | /** |
1117 | * Header for the generated file | |
1118 | **/ | |
1119 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1120 | { |
1121 | buf_printf(b, "#include <linux/module.h>\n"); | |
1122 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1123 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1124 | buf_printf(b, "\n"); | |
1125 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1126 | buf_printf(b, "\n"); | |
1da177e4 LT |
1127 | buf_printf(b, "struct module __this_module\n"); |
1128 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1129 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1130 | if (mod->has_init) |
1131 | buf_printf(b, " .init = init_module,\n"); | |
1132 | if (mod->has_cleanup) | |
1133 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1134 | " .exit = cleanup_module,\n" | |
1135 | "#endif\n"); | |
1136 | buf_printf(b, "};\n"); | |
1137 | } | |
1138 | ||
5c3ead8c SR |
1139 | /** |
1140 | * Record CRCs for unresolved symbols | |
1141 | **/ | |
1142 | static void add_versions(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1143 | { |
1144 | struct symbol *s, *exp; | |
1145 | ||
1146 | for (s = mod->unres; s; s = s->next) { | |
1147 | exp = find_symbol(s->name); | |
1148 | if (!exp || exp->module == mod) { | |
1149 | if (have_vmlinux && !s->weak) | |
cb80514d SR |
1150 | warn("\"%s\" [%s.ko] undefined!\n", |
1151 | s->name, mod->name); | |
1da177e4 LT |
1152 | continue; |
1153 | } | |
1154 | s->module = exp->module; | |
1155 | s->crc_valid = exp->crc_valid; | |
1156 | s->crc = exp->crc; | |
1157 | } | |
1158 | ||
1159 | if (!modversions) | |
1160 | return; | |
1161 | ||
1162 | buf_printf(b, "\n"); | |
1163 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1164 | buf_printf(b, "__attribute_used__\n"); | |
1165 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1166 | ||
1167 | for (s = mod->unres; s; s = s->next) { | |
1168 | if (!s->module) { | |
1169 | continue; | |
1170 | } | |
1171 | if (!s->crc_valid) { | |
cb80514d | 1172 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1173 | s->name, mod->name); |
1174 | continue; | |
1175 | } | |
1176 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1177 | } | |
1178 | ||
1179 | buf_printf(b, "};\n"); | |
1180 | } | |
1181 | ||
5c3ead8c SR |
1182 | static void add_depends(struct buffer *b, struct module *mod, |
1183 | struct module *modules) | |
1da177e4 LT |
1184 | { |
1185 | struct symbol *s; | |
1186 | struct module *m; | |
1187 | int first = 1; | |
1188 | ||
1189 | for (m = modules; m; m = m->next) { | |
1190 | m->seen = is_vmlinux(m->name); | |
1191 | } | |
1192 | ||
1193 | buf_printf(b, "\n"); | |
1194 | buf_printf(b, "static const char __module_depends[]\n"); | |
1195 | buf_printf(b, "__attribute_used__\n"); | |
1196 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1197 | buf_printf(b, "\"depends="); | |
1198 | for (s = mod->unres; s; s = s->next) { | |
1199 | if (!s->module) | |
1200 | continue; | |
1201 | ||
1202 | if (s->module->seen) | |
1203 | continue; | |
1204 | ||
1205 | s->module->seen = 1; | |
1206 | buf_printf(b, "%s%s", first ? "" : ",", | |
1207 | strrchr(s->module->name, '/') + 1); | |
1208 | first = 0; | |
1209 | } | |
1210 | buf_printf(b, "\";\n"); | |
1211 | } | |
1212 | ||
5c3ead8c | 1213 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1214 | { |
1215 | if (mod->srcversion[0]) { | |
1216 | buf_printf(b, "\n"); | |
1217 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1218 | mod->srcversion); | |
1219 | } | |
1220 | } | |
1221 | ||
5c3ead8c | 1222 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1223 | { |
1224 | char *tmp; | |
1225 | FILE *file; | |
1226 | struct stat st; | |
1227 | ||
1228 | file = fopen(fname, "r"); | |
1229 | if (!file) | |
1230 | goto write; | |
1231 | ||
1232 | if (fstat(fileno(file), &st) < 0) | |
1233 | goto close_write; | |
1234 | ||
1235 | if (st.st_size != b->pos) | |
1236 | goto close_write; | |
1237 | ||
1238 | tmp = NOFAIL(malloc(b->pos)); | |
1239 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1240 | goto free_write; | |
1241 | ||
1242 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1243 | goto free_write; | |
1244 | ||
1245 | free(tmp); | |
1246 | fclose(file); | |
1247 | return; | |
1248 | ||
1249 | free_write: | |
1250 | free(tmp); | |
1251 | close_write: | |
1252 | fclose(file); | |
1253 | write: | |
1254 | file = fopen(fname, "w"); | |
1255 | if (!file) { | |
1256 | perror(fname); | |
1257 | exit(1); | |
1258 | } | |
1259 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1260 | perror(fname); | |
1261 | exit(1); | |
1262 | } | |
1263 | fclose(file); | |
1264 | } | |
1265 | ||
bd5cbced RP |
1266 | /* parse Module.symvers file. line format: |
1267 | * 0x12345678<tab>symbol<tab>module[<tab>export] | |
1268 | **/ | |
040fcc81 | 1269 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1270 | { |
1271 | unsigned long size, pos = 0; | |
1272 | void *file = grab_file(fname, &size); | |
1273 | char *line; | |
1274 | ||
1275 | if (!file) | |
1276 | /* No symbol versions, silently ignore */ | |
1277 | return; | |
1278 | ||
1279 | while ((line = get_next_line(&pos, file, size))) { | |
bd5cbced | 1280 | char *symname, *modname, *d, *export; |
1da177e4 LT |
1281 | unsigned int crc; |
1282 | struct module *mod; | |
040fcc81 | 1283 | struct symbol *s; |
1da177e4 LT |
1284 | |
1285 | if (!(symname = strchr(line, '\t'))) | |
1286 | goto fail; | |
1287 | *symname++ = '\0'; | |
1288 | if (!(modname = strchr(symname, '\t'))) | |
1289 | goto fail; | |
1290 | *modname++ = '\0'; | |
bd5cbced RP |
1291 | if (!(export = strchr(modname, '\t'))) |
1292 | *export++ = '\0'; | |
1293 | ||
1da177e4 LT |
1294 | crc = strtoul(line, &d, 16); |
1295 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1296 | goto fail; | |
1297 | ||
1298 | if (!(mod = find_module(modname))) { | |
1299 | if (is_vmlinux(modname)) { | |
1300 | have_vmlinux = 1; | |
1301 | } | |
1302 | mod = new_module(NOFAIL(strdup(modname))); | |
1303 | mod->skip = 1; | |
1304 | } | |
bd5cbced | 1305 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1306 | s->kernel = kernel; |
1307 | s->preloaded = 1; | |
bd5cbced | 1308 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1309 | } |
1310 | return; | |
1311 | fail: | |
1312 | fatal("parse error in symbol dump file\n"); | |
1313 | } | |
1314 | ||
040fcc81 SR |
1315 | /* For normal builds always dump all symbols. |
1316 | * For external modules only dump symbols | |
1317 | * that are not read from kernel Module.symvers. | |
1318 | **/ | |
1319 | static int dump_sym(struct symbol *sym) | |
1320 | { | |
1321 | if (!external_module) | |
1322 | return 1; | |
1323 | if (sym->vmlinux || sym->kernel) | |
1324 | return 0; | |
1325 | return 1; | |
1326 | } | |
62070fa4 | 1327 | |
5c3ead8c | 1328 | static void write_dump(const char *fname) |
1da177e4 LT |
1329 | { |
1330 | struct buffer buf = { }; | |
1331 | struct symbol *symbol; | |
1332 | int n; | |
1333 | ||
1334 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1335 | symbol = symbolhash[n]; | |
1336 | while (symbol) { | |
040fcc81 | 1337 | if (dump_sym(symbol)) |
bd5cbced | 1338 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1339 | symbol->crc, symbol->name, |
bd5cbced RP |
1340 | symbol->module->name, |
1341 | export_str(symbol->export)); | |
1da177e4 LT |
1342 | symbol = symbol->next; |
1343 | } | |
1344 | } | |
1345 | write_if_changed(&buf, fname); | |
1346 | } | |
1347 | ||
5c3ead8c | 1348 | int main(int argc, char **argv) |
1da177e4 LT |
1349 | { |
1350 | struct module *mod; | |
1351 | struct buffer buf = { }; | |
1352 | char fname[SZ]; | |
040fcc81 SR |
1353 | char *kernel_read = NULL, *module_read = NULL; |
1354 | char *dump_write = NULL; | |
1da177e4 LT |
1355 | int opt; |
1356 | ||
040fcc81 | 1357 | while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) { |
1da177e4 LT |
1358 | switch(opt) { |
1359 | case 'i': | |
040fcc81 SR |
1360 | kernel_read = optarg; |
1361 | break; | |
1362 | case 'I': | |
1363 | module_read = optarg; | |
1364 | external_module = 1; | |
1da177e4 LT |
1365 | break; |
1366 | case 'm': | |
1367 | modversions = 1; | |
1368 | break; | |
1369 | case 'o': | |
1370 | dump_write = optarg; | |
1371 | break; | |
1372 | case 'a': | |
1373 | all_versions = 1; | |
1374 | break; | |
1375 | default: | |
1376 | exit(1); | |
1377 | } | |
1378 | } | |
1379 | ||
040fcc81 SR |
1380 | if (kernel_read) |
1381 | read_dump(kernel_read, 1); | |
1382 | if (module_read) | |
1383 | read_dump(module_read, 0); | |
1da177e4 LT |
1384 | |
1385 | while (optind < argc) { | |
1386 | read_symbols(argv[optind++]); | |
1387 | } | |
1388 | ||
b817f6fe SR |
1389 | for (mod = modules; mod; mod = mod->next) { |
1390 | if (mod->skip) | |
1391 | continue; | |
1392 | check_license(mod); | |
1393 | } | |
1394 | ||
1da177e4 LT |
1395 | for (mod = modules; mod; mod = mod->next) { |
1396 | if (mod->skip) | |
1397 | continue; | |
1398 | ||
1399 | buf.pos = 0; | |
1400 | ||
1401 | add_header(&buf, mod); | |
1402 | add_versions(&buf, mod); | |
1403 | add_depends(&buf, mod, modules); | |
1404 | add_moddevtable(&buf, mod); | |
1405 | add_srcversion(&buf, mod); | |
1406 | ||
1407 | sprintf(fname, "%s.mod.c", mod->name); | |
1408 | write_if_changed(&buf, fname); | |
1409 | } | |
1410 | ||
1411 | if (dump_write) | |
1412 | write_dump(dump_write); | |
1413 | ||
1414 | return 0; | |
1415 | } |