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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; | |
534b89a9 SR |
208 | if (!s) |
209 | return export_unknown; | |
bd5cbced RP |
210 | for (i = 0; export_list[i].export != export_unknown; i++) { |
211 | if (strcmp(export_list[i].str, s) == 0) | |
212 | return export_list[i].export; | |
213 | } | |
214 | return export_unknown; | |
215 | } | |
216 | ||
217 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
218 | { | |
219 | if (sec == elf->export_sec) | |
220 | return export_plain; | |
221 | else if (sec == elf->export_gpl_sec) | |
222 | return export_gpl; | |
223 | else if (sec == elf->export_gpl_future_sec) | |
224 | return export_gpl_future; | |
225 | else | |
226 | return export_unknown; | |
227 | } | |
228 | ||
5c3ead8c SR |
229 | /** |
230 | * Add an exported symbol - it may have already been added without a | |
231 | * CRC, in this case just update the CRC | |
232 | **/ | |
bd5cbced RP |
233 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
234 | enum export export) | |
1da177e4 LT |
235 | { |
236 | struct symbol *s = find_symbol(name); | |
237 | ||
238 | if (!s) { | |
bd5cbced | 239 | s = new_symbol(name, mod, export); |
8e70c458 SR |
240 | } else { |
241 | if (!s->preloaded) { | |
7b75b13c | 242 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
243 | "was in %s%s\n", mod->name, name, |
244 | s->module->name, | |
245 | is_vmlinux(s->module->name) ?"":".ko"); | |
246 | } | |
1da177e4 | 247 | } |
8e70c458 | 248 | s->preloaded = 0; |
040fcc81 SR |
249 | s->vmlinux = is_vmlinux(mod->name); |
250 | s->kernel = 0; | |
bd5cbced | 251 | s->export = export; |
040fcc81 SR |
252 | return s; |
253 | } | |
254 | ||
255 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 256 | unsigned int crc, enum export export) |
040fcc81 SR |
257 | { |
258 | struct symbol *s = find_symbol(name); | |
259 | ||
260 | if (!s) | |
bd5cbced | 261 | s = new_symbol(name, mod, export); |
040fcc81 SR |
262 | s->crc = crc; |
263 | s->crc_valid = 1; | |
1da177e4 LT |
264 | } |
265 | ||
5c3ead8c | 266 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
267 | { |
268 | struct stat st; | |
269 | void *map; | |
270 | int fd; | |
271 | ||
272 | fd = open(filename, O_RDONLY); | |
273 | if (fd < 0 || fstat(fd, &st) != 0) | |
274 | return NULL; | |
275 | ||
276 | *size = st.st_size; | |
277 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
278 | close(fd); | |
279 | ||
280 | if (map == MAP_FAILED) | |
281 | return NULL; | |
282 | return map; | |
283 | } | |
284 | ||
5c3ead8c SR |
285 | /** |
286 | * Return a copy of the next line in a mmap'ed file. | |
287 | * spaces in the beginning of the line is trimmed away. | |
288 | * Return a pointer to a static buffer. | |
289 | **/ | |
290 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) | |
1da177e4 LT |
291 | { |
292 | static char line[4096]; | |
293 | int skip = 1; | |
294 | size_t len = 0; | |
295 | signed char *p = (signed char *)file + *pos; | |
296 | char *s = line; | |
297 | ||
298 | for (; *pos < size ; (*pos)++) | |
299 | { | |
300 | if (skip && isspace(*p)) { | |
301 | p++; | |
302 | continue; | |
303 | } | |
304 | skip = 0; | |
305 | if (*p != '\n' && (*pos < size)) { | |
306 | len++; | |
307 | *s++ = *p++; | |
308 | if (len > 4095) | |
309 | break; /* Too long, stop */ | |
310 | } else { | |
311 | /* End of string */ | |
312 | *s = '\0'; | |
313 | return line; | |
314 | } | |
315 | } | |
316 | /* End of buffer */ | |
317 | return NULL; | |
318 | } | |
319 | ||
5c3ead8c | 320 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
321 | { |
322 | munmap(file, size); | |
323 | } | |
324 | ||
5c3ead8c | 325 | static void parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
326 | { |
327 | unsigned int i; | |
328 | Elf_Ehdr *hdr = info->hdr; | |
329 | Elf_Shdr *sechdrs; | |
330 | Elf_Sym *sym; | |
331 | ||
332 | hdr = grab_file(filename, &info->size); | |
333 | if (!hdr) { | |
334 | perror(filename); | |
6803dc0e | 335 | exit(1); |
1da177e4 LT |
336 | } |
337 | info->hdr = hdr; | |
338 | if (info->size < sizeof(*hdr)) | |
339 | goto truncated; | |
340 | ||
341 | /* Fix endianness in ELF header */ | |
342 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
343 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
344 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
345 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
346 | sechdrs = (void *)hdr + hdr->e_shoff; | |
347 | info->sechdrs = sechdrs; | |
348 | ||
349 | /* Fix endianness in section headers */ | |
350 | for (i = 0; i < hdr->e_shnum; i++) { | |
351 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
352 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
353 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
354 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
355 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
356 | } | |
357 | /* Find symbol table. */ | |
358 | for (i = 1; i < hdr->e_shnum; i++) { | |
359 | const char *secstrings | |
360 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 361 | const char *secname; |
1da177e4 LT |
362 | |
363 | if (sechdrs[i].sh_offset > info->size) | |
364 | goto truncated; | |
bd5cbced RP |
365 | secname = secstrings + sechdrs[i].sh_name; |
366 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
367 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
368 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
369 | } else if (strcmp(secname, "__ksymtab") == 0) |
370 | info->export_sec = i; | |
371 | else if (strcmp(secname, "__ksymtab_gpl") == 0) | |
372 | info->export_gpl_sec = i; | |
373 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) | |
374 | info->export_gpl_future_sec = i; | |
375 | ||
1da177e4 LT |
376 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
377 | continue; | |
378 | ||
379 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 380 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 381 | + sechdrs[i].sh_size; |
62070fa4 | 382 | info->strtab = (void *)hdr + |
1da177e4 LT |
383 | sechdrs[sechdrs[i].sh_link].sh_offset; |
384 | } | |
385 | if (!info->symtab_start) { | |
cb80514d | 386 | fatal("%s has no symtab?\n", filename); |
1da177e4 LT |
387 | } |
388 | /* Fix endianness in symbols */ | |
389 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
390 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
391 | sym->st_name = TO_NATIVE(sym->st_name); | |
392 | sym->st_value = TO_NATIVE(sym->st_value); | |
393 | sym->st_size = TO_NATIVE(sym->st_size); | |
394 | } | |
395 | return; | |
396 | ||
397 | truncated: | |
cb80514d | 398 | fatal("%s is truncated.\n", filename); |
1da177e4 LT |
399 | } |
400 | ||
5c3ead8c | 401 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
402 | { |
403 | release_file(info->hdr, info->size); | |
404 | } | |
405 | ||
f7b05e64 LY |
406 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
407 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 408 | |
5c3ead8c SR |
409 | static void handle_modversions(struct module *mod, struct elf_info *info, |
410 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
411 | { |
412 | unsigned int crc; | |
bd5cbced | 413 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
414 | |
415 | switch (sym->st_shndx) { | |
416 | case SHN_COMMON: | |
cb80514d | 417 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
418 | break; |
419 | case SHN_ABS: | |
420 | /* CRC'd symbol */ | |
421 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
422 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
423 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
424 | export); | |
1da177e4 LT |
425 | } |
426 | break; | |
427 | case SHN_UNDEF: | |
428 | /* undefined symbol */ | |
429 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
430 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
431 | break; | |
432 | /* ignore global offset table */ | |
433 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
434 | break; | |
435 | /* ignore __this_module, it will be resolved shortly */ | |
436 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
437 | break; | |
8d529014 BC |
438 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
439 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
440 | /* add compatibility with older glibc */ | |
441 | #ifndef STT_SPARC_REGISTER | |
442 | #define STT_SPARC_REGISTER STT_REGISTER | |
443 | #endif | |
1da177e4 LT |
444 | if (info->hdr->e_machine == EM_SPARC || |
445 | info->hdr->e_machine == EM_SPARCV9) { | |
446 | /* Ignore register directives. */ | |
8d529014 | 447 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 448 | break; |
62070fa4 SR |
449 | if (symname[0] == '.') { |
450 | char *munged = strdup(symname); | |
451 | munged[0] = '_'; | |
452 | munged[1] = toupper(munged[1]); | |
453 | symname = munged; | |
454 | } | |
1da177e4 LT |
455 | } |
456 | #endif | |
62070fa4 | 457 | |
1da177e4 LT |
458 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
459 | strlen(MODULE_SYMBOL_PREFIX)) == 0) | |
460 | mod->unres = alloc_symbol(symname + | |
461 | strlen(MODULE_SYMBOL_PREFIX), | |
462 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
463 | mod->unres); | |
464 | break; | |
465 | default: | |
466 | /* All exported symbols */ | |
467 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
468 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
469 | export); | |
1da177e4 LT |
470 | } |
471 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
472 | mod->has_init = 1; | |
473 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
474 | mod->has_cleanup = 1; | |
475 | break; | |
476 | } | |
477 | } | |
478 | ||
5c3ead8c SR |
479 | /** |
480 | * Parse tag=value strings from .modinfo section | |
481 | **/ | |
1da177e4 LT |
482 | static char *next_string(char *string, unsigned long *secsize) |
483 | { | |
484 | /* Skip non-zero chars */ | |
485 | while (string[0]) { | |
486 | string++; | |
487 | if ((*secsize)-- <= 1) | |
488 | return NULL; | |
489 | } | |
490 | ||
491 | /* Skip any zero padding. */ | |
492 | while (!string[0]) { | |
493 | string++; | |
494 | if ((*secsize)-- <= 1) | |
495 | return NULL; | |
496 | } | |
497 | return string; | |
498 | } | |
499 | ||
b817f6fe SR |
500 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
501 | const char *tag, char *info) | |
1da177e4 LT |
502 | { |
503 | char *p; | |
504 | unsigned int taglen = strlen(tag); | |
505 | unsigned long size = modinfo_len; | |
506 | ||
b817f6fe SR |
507 | if (info) { |
508 | size -= info - (char *)modinfo; | |
509 | modinfo = next_string(info, &size); | |
510 | } | |
511 | ||
1da177e4 LT |
512 | for (p = modinfo; p; p = next_string(p, &size)) { |
513 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
514 | return p + taglen + 1; | |
515 | } | |
516 | return NULL; | |
517 | } | |
518 | ||
b817f6fe SR |
519 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
520 | const char *tag) | |
521 | ||
522 | { | |
523 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
524 | } | |
525 | ||
4c8fbca5 SR |
526 | /** |
527 | * Test if string s ends in string sub | |
528 | * return 0 if match | |
529 | **/ | |
530 | static int strrcmp(const char *s, const char *sub) | |
531 | { | |
532 | int slen, sublen; | |
62070fa4 | 533 | |
4c8fbca5 SR |
534 | if (!s || !sub) |
535 | return 1; | |
62070fa4 | 536 | |
4c8fbca5 SR |
537 | slen = strlen(s); |
538 | sublen = strlen(sub); | |
62070fa4 | 539 | |
4c8fbca5 SR |
540 | if ((slen == 0) || (sublen == 0)) |
541 | return 1; | |
542 | ||
543 | if (sublen > slen) | |
544 | return 1; | |
545 | ||
546 | return memcmp(s + slen - sublen, sub, sublen); | |
547 | } | |
548 | ||
549 | /** | |
550 | * Whitelist to allow certain references to pass with no warning. | |
551 | * Pattern 1: | |
552 | * If a module parameter is declared __initdata and permissions=0 | |
553 | * then this is legal despite the warning generated. | |
554 | * We cannot see value of permissions here, so just ignore | |
555 | * this pattern. | |
556 | * The pattern is identified by: | |
557 | * tosec = .init.data | |
9209aed0 | 558 | * fromsec = .data* |
4c8fbca5 | 559 | * atsym =__param* |
62070fa4 | 560 | * |
4c8fbca5 | 561 | * Pattern 2: |
72ee59b5 | 562 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
563 | * add, remove, probe functions etc. |
564 | * These functions may often be marked __init and we do not want to | |
565 | * warn here. | |
566 | * the pattern is identified by: | |
5ecdd0f6 | 567 | * tosec = .init.text | .exit.text | .init.data |
4c8fbca5 | 568 | * fromsec = .data |
72ee59b5 | 569 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one |
4c8fbca5 SR |
570 | **/ |
571 | static int secref_whitelist(const char *tosec, const char *fromsec, | |
5ecdd0f6 | 572 | const char *atsym) |
4c8fbca5 SR |
573 | { |
574 | int f1 = 1, f2 = 1; | |
575 | const char **s; | |
576 | const char *pat2sym[] = { | |
72ee59b5 | 577 | "driver", |
5ecdd0f6 SR |
578 | "_template", /* scsi uses *_template a lot */ |
579 | "_sht", /* scsi also used *_sht to some extent */ | |
4c8fbca5 SR |
580 | "_ops", |
581 | "_probe", | |
582 | "_probe_one", | |
583 | NULL | |
584 | }; | |
62070fa4 | 585 | |
4c8fbca5 SR |
586 | /* Check for pattern 1 */ |
587 | if (strcmp(tosec, ".init.data") != 0) | |
588 | f1 = 0; | |
9209aed0 | 589 | if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
4c8fbca5 SR |
590 | f1 = 0; |
591 | if (strncmp(atsym, "__param", strlen("__param")) != 0) | |
592 | f1 = 0; | |
593 | ||
594 | if (f1) | |
595 | return f1; | |
596 | ||
597 | /* Check for pattern 2 */ | |
62070fa4 | 598 | if ((strcmp(tosec, ".init.text") != 0) && |
5ecdd0f6 SR |
599 | (strcmp(tosec, ".exit.text") != 0) && |
600 | (strcmp(tosec, ".init.data") != 0)) | |
4c8fbca5 SR |
601 | f2 = 0; |
602 | if (strcmp(fromsec, ".data") != 0) | |
603 | f2 = 0; | |
604 | ||
605 | for (s = pat2sym; *s; s++) | |
606 | if (strrcmp(atsym, *s) == 0) | |
607 | f1 = 1; | |
608 | ||
609 | return f1 && f2; | |
610 | } | |
611 | ||
93684d3b SR |
612 | /** |
613 | * Find symbol based on relocation record info. | |
614 | * In some cases the symbol supplied is a valid symbol so | |
615 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
616 | * In other cases the symbol needs to be looked up in the symbol table | |
617 | * based on section and address. | |
618 | * **/ | |
619 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
620 | Elf_Sym *relsym) | |
621 | { | |
622 | Elf_Sym *sym; | |
623 | ||
624 | if (relsym->st_name != 0) | |
625 | return relsym; | |
626 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
627 | if (sym->st_shndx != relsym->st_shndx) | |
628 | continue; | |
629 | if (sym->st_value == addr) | |
630 | return sym; | |
631 | } | |
632 | return NULL; | |
633 | } | |
634 | ||
b39927cf | 635 | /* |
43c74d17 SR |
636 | * Find symbols before or equal addr and after addr - in the section sec. |
637 | * If we find two symbols with equal offset prefer one with a valid name. | |
638 | * The ELF format may have a better way to detect what type of symbol | |
639 | * it is, but this works for now. | |
b39927cf SR |
640 | **/ |
641 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
642 | const char *sec, | |
643 | Elf_Sym **before, Elf_Sym **after) | |
644 | { | |
645 | Elf_Sym *sym; | |
646 | Elf_Ehdr *hdr = elf->hdr; | |
647 | Elf_Addr beforediff = ~0; | |
648 | Elf_Addr afterdiff = ~0; | |
649 | const char *secstrings = (void *)hdr + | |
650 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 651 | |
b39927cf SR |
652 | *before = NULL; |
653 | *after = NULL; | |
654 | ||
655 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
656 | const char *symsec; | |
657 | ||
658 | if (sym->st_shndx >= SHN_LORESERVE) | |
659 | continue; | |
660 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
661 | if (strcmp(symsec, sec) != 0) | |
662 | continue; | |
663 | if (sym->st_value <= addr) { | |
664 | if ((addr - sym->st_value) < beforediff) { | |
665 | beforediff = addr - sym->st_value; | |
666 | *before = sym; | |
667 | } | |
43c74d17 SR |
668 | else if ((addr - sym->st_value) == beforediff) { |
669 | /* equal offset, valid name? */ | |
670 | const char *name = elf->strtab + sym->st_name; | |
671 | if (name && strlen(name)) | |
672 | *before = sym; | |
673 | } | |
b39927cf SR |
674 | } |
675 | else | |
676 | { | |
677 | if ((sym->st_value - addr) < afterdiff) { | |
678 | afterdiff = sym->st_value - addr; | |
679 | *after = sym; | |
680 | } | |
43c74d17 SR |
681 | else if ((sym->st_value - addr) == afterdiff) { |
682 | /* equal offset, valid name? */ | |
683 | const char *name = elf->strtab + sym->st_name; | |
684 | if (name && strlen(name)) | |
685 | *after = sym; | |
686 | } | |
b39927cf SR |
687 | } |
688 | } | |
689 | } | |
690 | ||
691 | /** | |
692 | * Print a warning about a section mismatch. | |
693 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 694 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
695 | **/ |
696 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
697 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
698 | { | |
93684d3b SR |
699 | const char *refsymname = ""; |
700 | Elf_Sym *before, *after; | |
701 | Elf_Sym *refsym; | |
b39927cf SR |
702 | Elf_Ehdr *hdr = elf->hdr; |
703 | Elf_Shdr *sechdrs = elf->sechdrs; | |
704 | const char *secstrings = (void *)hdr + | |
705 | sechdrs[hdr->e_shstrndx].sh_offset; | |
706 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 707 | |
b39927cf SR |
708 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
709 | ||
93684d3b SR |
710 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
711 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
712 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
713 | |
714 | /* check whitelist - we may ignore it */ | |
62070fa4 | 715 | if (before && |
4c8fbca5 SR |
716 | secref_whitelist(secname, fromsec, elf->strtab + before->st_name)) |
717 | return; | |
62070fa4 | 718 | |
b39927cf | 719 | if (before && after) { |
93684d3b SR |
720 | warn("%s - Section mismatch: reference to %s:%s from %s " |
721 | "between '%s' (at offset 0x%llx) and '%s'\n", | |
722 | modname, secname, refsymname, fromsec, | |
b39927cf | 723 | elf->strtab + before->st_name, |
93684d3b | 724 | (long long)r.r_offset, |
b39927cf SR |
725 | elf->strtab + after->st_name); |
726 | } else if (before) { | |
93684d3b SR |
727 | warn("%s - Section mismatch: reference to %s:%s from %s " |
728 | "after '%s' (at offset 0x%llx)\n", | |
62070fa4 | 729 | modname, secname, refsymname, fromsec, |
b39927cf | 730 | elf->strtab + before->st_name, |
93684d3b | 731 | (long long)r.r_offset); |
b39927cf | 732 | } else if (after) { |
93684d3b SR |
733 | warn("%s - Section mismatch: reference to %s:%s from %s " |
734 | "before '%s' (at offset -0x%llx)\n", | |
62070fa4 | 735 | modname, secname, refsymname, fromsec, |
eaaae38c | 736 | elf->strtab + after->st_name, |
93684d3b | 737 | (long long)r.r_offset); |
b39927cf | 738 | } else { |
93684d3b SR |
739 | warn("%s - Section mismatch: reference to %s:%s from %s " |
740 | "(offset 0x%llx)\n", | |
741 | modname, secname, fromsec, refsymname, | |
742 | (long long)r.r_offset); | |
b39927cf SR |
743 | } |
744 | } | |
745 | ||
746 | /** | |
747 | * A module includes a number of sections that are discarded | |
748 | * either when loaded or when used as built-in. | |
749 | * For loaded modules all functions marked __init and all data | |
750 | * marked __initdata will be discarded when the module has been intialized. | |
751 | * Likewise for modules used built-in the sections marked __exit | |
752 | * are discarded because __exit marked function are supposed to be called | |
753 | * only when a moduel is unloaded which never happes for built-in modules. | |
754 | * The check_sec_ref() function traverses all relocation records | |
755 | * to find all references to a section that reference a section that will | |
756 | * be discarded and warns about it. | |
757 | **/ | |
758 | static void check_sec_ref(struct module *mod, const char *modname, | |
759 | struct elf_info *elf, | |
760 | int section(const char*), | |
761 | int section_ref_ok(const char *)) | |
762 | { | |
763 | int i; | |
764 | Elf_Sym *sym; | |
765 | Elf_Ehdr *hdr = elf->hdr; | |
766 | Elf_Shdr *sechdrs = elf->sechdrs; | |
767 | const char *secstrings = (void *)hdr + | |
768 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 769 | |
b39927cf SR |
770 | /* Walk through all sections */ |
771 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
772 | const char *name = secstrings + sechdrs[i].sh_name; |
773 | const char *secname; | |
774 | Elf_Rela r; | |
eae07ac6 | 775 | unsigned int r_sym; |
b39927cf | 776 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
777 | if (sechdrs[i].sh_type == SHT_RELA) { |
778 | Elf_Rela *rela; | |
779 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
780 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
781 | name += strlen(".rela"); | |
782 | if (section_ref_ok(name)) | |
783 | continue; | |
b39927cf | 784 | |
2c1a51f3 AN |
785 | for (rela = start; rela < stop; rela++) { |
786 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
787 | #if KERNEL_ELFCLASS == ELFCLASS64 |
788 | if (hdr->e_machine == EM_MIPS) { | |
789 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
790 | r_sym = TO_NATIVE(r_sym); | |
791 | } else { | |
792 | r.r_info = TO_NATIVE(rela->r_info); | |
793 | r_sym = ELF_R_SYM(r.r_info); | |
794 | } | |
795 | #else | |
796 | r.r_info = TO_NATIVE(rela->r_info); | |
797 | r_sym = ELF_R_SYM(r.r_info); | |
798 | #endif | |
2c1a51f3 | 799 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 800 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
801 | /* Skip special sections */ |
802 | if (sym->st_shndx >= SHN_LORESERVE) | |
803 | continue; | |
804 | ||
805 | secname = secstrings + | |
806 | sechdrs[sym->st_shndx].sh_name; | |
807 | if (section(secname)) | |
808 | warn_sec_mismatch(modname, name, | |
809 | elf, sym, r); | |
810 | } | |
811 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
812 | Elf_Rel *rel; | |
813 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
814 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
815 | name += strlen(".rel"); | |
816 | if (section_ref_ok(name)) | |
b39927cf SR |
817 | continue; |
818 | ||
2c1a51f3 AN |
819 | for (rel = start; rel < stop; rel++) { |
820 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
821 | #if KERNEL_ELFCLASS == ELFCLASS64 |
822 | if (hdr->e_machine == EM_MIPS) { | |
823 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
824 | r_sym = TO_NATIVE(r_sym); | |
825 | } else { | |
826 | r.r_info = TO_NATIVE(rel->r_info); | |
827 | r_sym = ELF_R_SYM(r.r_info); | |
828 | } | |
829 | #else | |
830 | r.r_info = TO_NATIVE(rel->r_info); | |
831 | r_sym = ELF_R_SYM(r.r_info); | |
832 | #endif | |
2c1a51f3 | 833 | r.r_addend = 0; |
eae07ac6 | 834 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
835 | /* Skip special sections */ |
836 | if (sym->st_shndx >= SHN_LORESERVE) | |
837 | continue; | |
838 | ||
839 | secname = secstrings + | |
840 | sechdrs[sym->st_shndx].sh_name; | |
841 | if (section(secname)) | |
842 | warn_sec_mismatch(modname, name, | |
843 | elf, sym, r); | |
844 | } | |
b39927cf SR |
845 | } |
846 | } | |
847 | } | |
848 | ||
849 | /** | |
850 | * Functions used only during module init is marked __init and is stored in | |
851 | * a .init.text section. Likewise data is marked __initdata and stored in | |
852 | * a .init.data section. | |
853 | * If this section is one of these sections return 1 | |
854 | * See include/linux/init.h for the details | |
855 | **/ | |
856 | static int init_section(const char *name) | |
857 | { | |
858 | if (strcmp(name, ".init") == 0) | |
859 | return 1; | |
860 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
861 | return 1; | |
862 | return 0; | |
863 | } | |
864 | ||
865 | /** | |
866 | * Identify sections from which references to a .init section is OK. | |
62070fa4 | 867 | * |
b39927cf SR |
868 | * Unfortunately references to read only data that referenced .init |
869 | * sections had to be excluded. Almost all of these are false | |
870 | * positives, they are created by gcc. The downside of excluding rodata | |
871 | * is that there really are some user references from rodata to | |
872 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 873 | * |
b39927cf SR |
874 | * const struct consw vga_con = { |
875 | * con_startup: vgacon_startup, | |
876 | * | |
877 | * where vgacon_startup is __init. If you want to wade through the false | |
878 | * positives, take out the check for rodata. | |
879 | **/ | |
880 | static int init_section_ref_ok(const char *name) | |
881 | { | |
882 | const char **s; | |
883 | /* Absolute section names */ | |
884 | const char *namelist1[] = { | |
885 | ".init", | |
9209aed0 SR |
886 | ".opd", /* see comment [OPD] at exit_section_ref_ok() */ |
887 | ".toc1", /* used by ppc64 */ | |
b39927cf SR |
888 | ".stab", |
889 | ".rodata", | |
890 | ".text.lock", | |
9209aed0 | 891 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
892 | ".pci_fixup_header", |
893 | ".pci_fixup_final", | |
894 | ".pdr", | |
895 | "__param", | |
468d9494 AV |
896 | "__ex_table", |
897 | ".fixup", | |
35899c57 | 898 | ".smp_locks", |
909252d2 | 899 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
b39927cf SR |
900 | NULL |
901 | }; | |
902 | /* Start of section names */ | |
903 | const char *namelist2[] = { | |
904 | ".init.", | |
905 | ".altinstructions", | |
906 | ".eh_frame", | |
907 | ".debug", | |
908 | NULL | |
909 | }; | |
6e10133f SR |
910 | /* part of section name */ |
911 | const char *namelist3 [] = { | |
912 | ".unwind", /* sample: IA_64.unwind.init.text */ | |
913 | NULL | |
914 | }; | |
915 | ||
b39927cf SR |
916 | for (s = namelist1; *s; s++) |
917 | if (strcmp(*s, name) == 0) | |
918 | return 1; | |
62070fa4 | 919 | for (s = namelist2; *s; s++) |
b39927cf SR |
920 | if (strncmp(*s, name, strlen(*s)) == 0) |
921 | return 1; | |
62070fa4 | 922 | for (s = namelist3; *s; s++) |
e835a39c | 923 | if (strstr(name, *s) != NULL) |
6e10133f | 924 | return 1; |
468d9494 AV |
925 | if (strrcmp(name, ".init") == 0) |
926 | return 1; | |
b39927cf SR |
927 | return 0; |
928 | } | |
929 | ||
930 | /* | |
931 | * Functions used only during module exit is marked __exit and is stored in | |
932 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
933 | * a .exit.data section. | |
934 | * If this section is one of these sections return 1 | |
935 | * See include/linux/init.h for the details | |
936 | **/ | |
937 | static int exit_section(const char *name) | |
938 | { | |
939 | if (strcmp(name, ".exit.text") == 0) | |
940 | return 1; | |
941 | if (strcmp(name, ".exit.data") == 0) | |
942 | return 1; | |
943 | return 0; | |
62070fa4 | 944 | |
b39927cf SR |
945 | } |
946 | ||
947 | /* | |
948 | * Identify sections from which references to a .exit section is OK. | |
62070fa4 | 949 | * |
b39927cf SR |
950 | * [OPD] Keith Ownes <kaos@sgi.com> commented: |
951 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
952 | * section, not the ia64 .opd section. | |
953 | * ia64 .opd should not point to discarded sections. | |
5ecdd0f6 | 954 | * [.rodata] like for .init.text we ignore .rodata references -same reason |
b39927cf SR |
955 | **/ |
956 | static int exit_section_ref_ok(const char *name) | |
957 | { | |
958 | const char **s; | |
959 | /* Absolute section names */ | |
960 | const char *namelist1[] = { | |
961 | ".exit.text", | |
962 | ".exit.data", | |
963 | ".init.text", | |
5ecdd0f6 | 964 | ".rodata", |
b39927cf | 965 | ".opd", /* See comment [OPD] */ |
9209aed0 | 966 | ".toc1", /* used by ppc64 */ |
b39927cf SR |
967 | ".altinstructions", |
968 | ".pdr", | |
9209aed0 | 969 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
970 | ".exitcall.exit", |
971 | ".eh_frame", | |
972 | ".stab", | |
468d9494 AV |
973 | "__ex_table", |
974 | ".fixup", | |
35899c57 | 975 | ".smp_locks", |
909252d2 | 976 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
b39927cf SR |
977 | NULL |
978 | }; | |
979 | /* Start of section names */ | |
980 | const char *namelist2[] = { | |
981 | ".debug", | |
982 | NULL | |
983 | }; | |
6e10133f SR |
984 | /* part of section name */ |
985 | const char *namelist3 [] = { | |
986 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
987 | NULL | |
988 | }; | |
62070fa4 | 989 | |
b39927cf SR |
990 | for (s = namelist1; *s; s++) |
991 | if (strcmp(*s, name) == 0) | |
992 | return 1; | |
62070fa4 | 993 | for (s = namelist2; *s; s++) |
b39927cf SR |
994 | if (strncmp(*s, name, strlen(*s)) == 0) |
995 | return 1; | |
62070fa4 | 996 | for (s = namelist3; *s; s++) |
e835a39c | 997 | if (strstr(name, *s) != NULL) |
6e10133f | 998 | return 1; |
b39927cf SR |
999 | return 0; |
1000 | } | |
1001 | ||
5c3ead8c | 1002 | static void read_symbols(char *modname) |
1da177e4 LT |
1003 | { |
1004 | const char *symname; | |
1005 | char *version; | |
b817f6fe | 1006 | char *license; |
1da177e4 LT |
1007 | struct module *mod; |
1008 | struct elf_info info = { }; | |
1009 | Elf_Sym *sym; | |
1010 | ||
1011 | parse_elf(&info, modname); | |
1012 | ||
1013 | mod = new_module(modname); | |
1014 | ||
1015 | /* When there's no vmlinux, don't print warnings about | |
1016 | * unresolved symbols (since there'll be too many ;) */ | |
1017 | if (is_vmlinux(modname)) { | |
1da177e4 | 1018 | have_vmlinux = 1; |
1da177e4 LT |
1019 | mod->skip = 1; |
1020 | } | |
1021 | ||
b817f6fe SR |
1022 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1023 | while (license) { | |
1024 | if (license_is_gpl_compatible(license)) | |
1025 | mod->gpl_compatible = 1; | |
1026 | else { | |
1027 | mod->gpl_compatible = 0; | |
1028 | break; | |
1029 | } | |
1030 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1031 | "license", license); | |
1032 | } | |
1033 | ||
1da177e4 LT |
1034 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1035 | symname = info.strtab + sym->st_name; | |
1036 | ||
1037 | handle_modversions(mod, &info, sym, symname); | |
1038 | handle_moddevtable(mod, &info, sym, symname); | |
1039 | } | |
b39927cf SR |
1040 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
1041 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1da177e4 LT |
1042 | |
1043 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1044 | if (version) | |
1045 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1046 | version - (char *)info.hdr); | |
1047 | if (version || (all_versions && !is_vmlinux(modname))) | |
1048 | get_src_version(modname, mod->srcversion, | |
1049 | sizeof(mod->srcversion)-1); | |
1050 | ||
1051 | parse_elf_finish(&info); | |
1052 | ||
1053 | /* Our trick to get versioning for struct_module - it's | |
1054 | * never passed as an argument to an exported function, so | |
1055 | * the automatic versioning doesn't pick it up, but it's really | |
1056 | * important anyhow */ | |
1057 | if (modversions) | |
1058 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1059 | } | |
1060 | ||
1061 | #define SZ 500 | |
1062 | ||
1063 | /* We first write the generated file into memory using the | |
1064 | * following helper, then compare to the file on disk and | |
1065 | * only update the later if anything changed */ | |
1066 | ||
5c3ead8c SR |
1067 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1068 | const char *fmt, ...) | |
1da177e4 LT |
1069 | { |
1070 | char tmp[SZ]; | |
1071 | int len; | |
1072 | va_list ap; | |
62070fa4 | 1073 | |
1da177e4 LT |
1074 | va_start(ap, fmt); |
1075 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1076 | buf_write(buf, tmp, len); |
1da177e4 LT |
1077 | va_end(ap); |
1078 | } | |
1079 | ||
5c3ead8c | 1080 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1081 | { |
1082 | if (buf->size - buf->pos < len) { | |
7670f023 | 1083 | buf->size += len + SZ; |
1da177e4 LT |
1084 | buf->p = realloc(buf->p, buf->size); |
1085 | } | |
1086 | strncpy(buf->p + buf->pos, s, len); | |
1087 | buf->pos += len; | |
1088 | } | |
1089 | ||
b817f6fe SR |
1090 | void check_license(struct module *mod) |
1091 | { | |
1092 | struct symbol *s, *exp; | |
1093 | ||
1094 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1095 | const char *basename; |
b817f6fe SR |
1096 | if (mod->gpl_compatible == 1) { |
1097 | /* GPL-compatible modules may use all symbols */ | |
1098 | continue; | |
1099 | } | |
1100 | exp = find_symbol(s->name); | |
1101 | if (!exp || exp->module == mod) | |
1102 | continue; | |
6449bd62 | 1103 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1104 | if (basename) |
1105 | basename++; | |
1106 | switch (exp->export) { | |
1107 | case export_gpl: | |
1108 | fatal("modpost: GPL-incompatible module %s " | |
1109 | "uses GPL-only symbol '%s'\n", | |
1110 | basename ? basename : mod->name, | |
1111 | exp->name); | |
1112 | break; | |
1113 | case export_gpl_future: | |
1114 | warn("modpost: GPL-incompatible module %s " | |
1115 | "uses future GPL-only symbol '%s'\n", | |
1116 | basename ? basename : mod->name, | |
1117 | exp->name); | |
1118 | break; | |
1119 | case export_plain: /* ignore */ break; | |
1120 | case export_unknown: /* ignore */ break; | |
1121 | } | |
1122 | } | |
1123 | } | |
1124 | ||
5c3ead8c SR |
1125 | /** |
1126 | * Header for the generated file | |
1127 | **/ | |
1128 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1129 | { |
1130 | buf_printf(b, "#include <linux/module.h>\n"); | |
1131 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1132 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1133 | buf_printf(b, "\n"); | |
1134 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1135 | buf_printf(b, "\n"); | |
1da177e4 LT |
1136 | buf_printf(b, "struct module __this_module\n"); |
1137 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1138 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1139 | if (mod->has_init) |
1140 | buf_printf(b, " .init = init_module,\n"); | |
1141 | if (mod->has_cleanup) | |
1142 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1143 | " .exit = cleanup_module,\n" | |
1144 | "#endif\n"); | |
1145 | buf_printf(b, "};\n"); | |
1146 | } | |
1147 | ||
5c3ead8c SR |
1148 | /** |
1149 | * Record CRCs for unresolved symbols | |
1150 | **/ | |
1151 | static void add_versions(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1152 | { |
1153 | struct symbol *s, *exp; | |
1154 | ||
1155 | for (s = mod->unres; s; s = s->next) { | |
1156 | exp = find_symbol(s->name); | |
1157 | if (!exp || exp->module == mod) { | |
1158 | if (have_vmlinux && !s->weak) | |
cb80514d SR |
1159 | warn("\"%s\" [%s.ko] undefined!\n", |
1160 | s->name, mod->name); | |
1da177e4 LT |
1161 | continue; |
1162 | } | |
1163 | s->module = exp->module; | |
1164 | s->crc_valid = exp->crc_valid; | |
1165 | s->crc = exp->crc; | |
1166 | } | |
1167 | ||
1168 | if (!modversions) | |
1169 | return; | |
1170 | ||
1171 | buf_printf(b, "\n"); | |
1172 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1173 | buf_printf(b, "__attribute_used__\n"); | |
1174 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1175 | ||
1176 | for (s = mod->unres; s; s = s->next) { | |
1177 | if (!s->module) { | |
1178 | continue; | |
1179 | } | |
1180 | if (!s->crc_valid) { | |
cb80514d | 1181 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1182 | s->name, mod->name); |
1183 | continue; | |
1184 | } | |
1185 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1186 | } | |
1187 | ||
1188 | buf_printf(b, "};\n"); | |
1189 | } | |
1190 | ||
5c3ead8c SR |
1191 | static void add_depends(struct buffer *b, struct module *mod, |
1192 | struct module *modules) | |
1da177e4 LT |
1193 | { |
1194 | struct symbol *s; | |
1195 | struct module *m; | |
1196 | int first = 1; | |
1197 | ||
1198 | for (m = modules; m; m = m->next) { | |
1199 | m->seen = is_vmlinux(m->name); | |
1200 | } | |
1201 | ||
1202 | buf_printf(b, "\n"); | |
1203 | buf_printf(b, "static const char __module_depends[]\n"); | |
1204 | buf_printf(b, "__attribute_used__\n"); | |
1205 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1206 | buf_printf(b, "\"depends="); | |
1207 | for (s = mod->unres; s; s = s->next) { | |
1208 | if (!s->module) | |
1209 | continue; | |
1210 | ||
1211 | if (s->module->seen) | |
1212 | continue; | |
1213 | ||
1214 | s->module->seen = 1; | |
1215 | buf_printf(b, "%s%s", first ? "" : ",", | |
1216 | strrchr(s->module->name, '/') + 1); | |
1217 | first = 0; | |
1218 | } | |
1219 | buf_printf(b, "\";\n"); | |
1220 | } | |
1221 | ||
5c3ead8c | 1222 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1223 | { |
1224 | if (mod->srcversion[0]) { | |
1225 | buf_printf(b, "\n"); | |
1226 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1227 | mod->srcversion); | |
1228 | } | |
1229 | } | |
1230 | ||
5c3ead8c | 1231 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1232 | { |
1233 | char *tmp; | |
1234 | FILE *file; | |
1235 | struct stat st; | |
1236 | ||
1237 | file = fopen(fname, "r"); | |
1238 | if (!file) | |
1239 | goto write; | |
1240 | ||
1241 | if (fstat(fileno(file), &st) < 0) | |
1242 | goto close_write; | |
1243 | ||
1244 | if (st.st_size != b->pos) | |
1245 | goto close_write; | |
1246 | ||
1247 | tmp = NOFAIL(malloc(b->pos)); | |
1248 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1249 | goto free_write; | |
1250 | ||
1251 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1252 | goto free_write; | |
1253 | ||
1254 | free(tmp); | |
1255 | fclose(file); | |
1256 | return; | |
1257 | ||
1258 | free_write: | |
1259 | free(tmp); | |
1260 | close_write: | |
1261 | fclose(file); | |
1262 | write: | |
1263 | file = fopen(fname, "w"); | |
1264 | if (!file) { | |
1265 | perror(fname); | |
1266 | exit(1); | |
1267 | } | |
1268 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1269 | perror(fname); | |
1270 | exit(1); | |
1271 | } | |
1272 | fclose(file); | |
1273 | } | |
1274 | ||
bd5cbced | 1275 | /* parse Module.symvers file. line format: |
534b89a9 | 1276 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1277 | **/ |
040fcc81 | 1278 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1279 | { |
1280 | unsigned long size, pos = 0; | |
1281 | void *file = grab_file(fname, &size); | |
1282 | char *line; | |
1283 | ||
1284 | if (!file) | |
1285 | /* No symbol versions, silently ignore */ | |
1286 | return; | |
1287 | ||
1288 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1289 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1290 | unsigned int crc; |
1291 | struct module *mod; | |
040fcc81 | 1292 | struct symbol *s; |
1da177e4 LT |
1293 | |
1294 | if (!(symname = strchr(line, '\t'))) | |
1295 | goto fail; | |
1296 | *symname++ = '\0'; | |
1297 | if (!(modname = strchr(symname, '\t'))) | |
1298 | goto fail; | |
1299 | *modname++ = '\0'; | |
9ac545b0 | 1300 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1301 | *export++ = '\0'; |
534b89a9 SR |
1302 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1303 | *end = '\0'; | |
1da177e4 LT |
1304 | crc = strtoul(line, &d, 16); |
1305 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1306 | goto fail; | |
1307 | ||
1308 | if (!(mod = find_module(modname))) { | |
1309 | if (is_vmlinux(modname)) { | |
1310 | have_vmlinux = 1; | |
1311 | } | |
1312 | mod = new_module(NOFAIL(strdup(modname))); | |
1313 | mod->skip = 1; | |
1314 | } | |
bd5cbced | 1315 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1316 | s->kernel = kernel; |
1317 | s->preloaded = 1; | |
bd5cbced | 1318 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1319 | } |
1320 | return; | |
1321 | fail: | |
1322 | fatal("parse error in symbol dump file\n"); | |
1323 | } | |
1324 | ||
040fcc81 SR |
1325 | /* For normal builds always dump all symbols. |
1326 | * For external modules only dump symbols | |
1327 | * that are not read from kernel Module.symvers. | |
1328 | **/ | |
1329 | static int dump_sym(struct symbol *sym) | |
1330 | { | |
1331 | if (!external_module) | |
1332 | return 1; | |
1333 | if (sym->vmlinux || sym->kernel) | |
1334 | return 0; | |
1335 | return 1; | |
1336 | } | |
62070fa4 | 1337 | |
5c3ead8c | 1338 | static void write_dump(const char *fname) |
1da177e4 LT |
1339 | { |
1340 | struct buffer buf = { }; | |
1341 | struct symbol *symbol; | |
1342 | int n; | |
1343 | ||
1344 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1345 | symbol = symbolhash[n]; | |
1346 | while (symbol) { | |
040fcc81 | 1347 | if (dump_sym(symbol)) |
bd5cbced | 1348 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1349 | symbol->crc, symbol->name, |
bd5cbced RP |
1350 | symbol->module->name, |
1351 | export_str(symbol->export)); | |
1da177e4 LT |
1352 | symbol = symbol->next; |
1353 | } | |
1354 | } | |
1355 | write_if_changed(&buf, fname); | |
1356 | } | |
1357 | ||
5c3ead8c | 1358 | int main(int argc, char **argv) |
1da177e4 LT |
1359 | { |
1360 | struct module *mod; | |
1361 | struct buffer buf = { }; | |
1362 | char fname[SZ]; | |
040fcc81 SR |
1363 | char *kernel_read = NULL, *module_read = NULL; |
1364 | char *dump_write = NULL; | |
1da177e4 LT |
1365 | int opt; |
1366 | ||
040fcc81 | 1367 | while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) { |
1da177e4 LT |
1368 | switch(opt) { |
1369 | case 'i': | |
040fcc81 SR |
1370 | kernel_read = optarg; |
1371 | break; | |
1372 | case 'I': | |
1373 | module_read = optarg; | |
1374 | external_module = 1; | |
1da177e4 LT |
1375 | break; |
1376 | case 'm': | |
1377 | modversions = 1; | |
1378 | break; | |
1379 | case 'o': | |
1380 | dump_write = optarg; | |
1381 | break; | |
1382 | case 'a': | |
1383 | all_versions = 1; | |
1384 | break; | |
1385 | default: | |
1386 | exit(1); | |
1387 | } | |
1388 | } | |
1389 | ||
040fcc81 SR |
1390 | if (kernel_read) |
1391 | read_dump(kernel_read, 1); | |
1392 | if (module_read) | |
1393 | read_dump(module_read, 0); | |
1da177e4 LT |
1394 | |
1395 | while (optind < argc) { | |
1396 | read_symbols(argv[optind++]); | |
1397 | } | |
1398 | ||
b817f6fe SR |
1399 | for (mod = modules; mod; mod = mod->next) { |
1400 | if (mod->skip) | |
1401 | continue; | |
1402 | check_license(mod); | |
1403 | } | |
1404 | ||
1da177e4 LT |
1405 | for (mod = modules; mod; mod = mod->next) { |
1406 | if (mod->skip) | |
1407 | continue; | |
1408 | ||
1409 | buf.pos = 0; | |
1410 | ||
1411 | add_header(&buf, mod); | |
1412 | add_versions(&buf, mod); | |
1413 | add_depends(&buf, mod, modules); | |
1414 | add_moddevtable(&buf, mod); | |
1415 | add_srcversion(&buf, mod); | |
1416 | ||
1417 | sprintf(fname, "%s.mod.c", mod->name); | |
1418 | write_if_changed(&buf, fname); | |
1419 | } | |
1420 | ||
1421 | if (dump_write) | |
1422 | write_dump(dump_write); | |
1423 | ||
1424 | return 0; | |
1425 | } |