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; | |
c53ddacd KK |
26 | /* Only warn about unresolved symbols */ |
27 | static int warn_unresolved = 0; | |
bd5cbced | 28 | /* How a symbol is exported */ |
c96fca21 SR |
29 | enum export { |
30 | export_plain, export_unused, export_gpl, | |
31 | export_unused_gpl, export_gpl_future, export_unknown | |
32 | }; | |
1da177e4 | 33 | |
5c3ead8c | 34 | void fatal(const char *fmt, ...) |
1da177e4 LT |
35 | { |
36 | va_list arglist; | |
37 | ||
38 | fprintf(stderr, "FATAL: "); | |
39 | ||
40 | va_start(arglist, fmt); | |
41 | vfprintf(stderr, fmt, arglist); | |
42 | va_end(arglist); | |
43 | ||
44 | exit(1); | |
45 | } | |
46 | ||
5c3ead8c | 47 | void warn(const char *fmt, ...) |
1da177e4 LT |
48 | { |
49 | va_list arglist; | |
50 | ||
51 | fprintf(stderr, "WARNING: "); | |
52 | ||
53 | va_start(arglist, fmt); | |
54 | vfprintf(stderr, fmt, arglist); | |
55 | va_end(arglist); | |
56 | } | |
57 | ||
2a116659 MW |
58 | void merror(const char *fmt, ...) |
59 | { | |
60 | va_list arglist; | |
61 | ||
62 | fprintf(stderr, "ERROR: "); | |
63 | ||
64 | va_start(arglist, fmt); | |
65 | vfprintf(stderr, fmt, arglist); | |
66 | va_end(arglist); | |
67 | } | |
68 | ||
040fcc81 SR |
69 | static int is_vmlinux(const char *modname) |
70 | { | |
71 | const char *myname; | |
72 | ||
73 | if ((myname = strrchr(modname, '/'))) | |
74 | myname++; | |
75 | else | |
76 | myname = modname; | |
77 | ||
78 | return strcmp(myname, "vmlinux") == 0; | |
79 | } | |
80 | ||
1da177e4 LT |
81 | void *do_nofail(void *ptr, const char *expr) |
82 | { | |
83 | if (!ptr) { | |
84 | fatal("modpost: Memory allocation failure: %s.\n", expr); | |
85 | } | |
86 | return ptr; | |
87 | } | |
88 | ||
89 | /* A list of all modules we processed */ | |
90 | ||
91 | static struct module *modules; | |
92 | ||
5c3ead8c | 93 | static struct module *find_module(char *modname) |
1da177e4 LT |
94 | { |
95 | struct module *mod; | |
96 | ||
97 | for (mod = modules; mod; mod = mod->next) | |
98 | if (strcmp(mod->name, modname) == 0) | |
99 | break; | |
100 | return mod; | |
101 | } | |
102 | ||
5c3ead8c | 103 | static struct module *new_module(char *modname) |
1da177e4 LT |
104 | { |
105 | struct module *mod; | |
106 | char *p, *s; | |
62070fa4 | 107 | |
1da177e4 LT |
108 | mod = NOFAIL(malloc(sizeof(*mod))); |
109 | memset(mod, 0, sizeof(*mod)); | |
110 | p = NOFAIL(strdup(modname)); | |
111 | ||
112 | /* strip trailing .o */ | |
113 | if ((s = strrchr(p, '.')) != NULL) | |
114 | if (strcmp(s, ".o") == 0) | |
115 | *s = '\0'; | |
116 | ||
117 | /* add to list */ | |
118 | mod->name = p; | |
b817f6fe | 119 | mod->gpl_compatible = -1; |
1da177e4 LT |
120 | mod->next = modules; |
121 | modules = mod; | |
122 | ||
123 | return mod; | |
124 | } | |
125 | ||
126 | /* A hash of all exported symbols, | |
127 | * struct symbol is also used for lists of unresolved symbols */ | |
128 | ||
129 | #define SYMBOL_HASH_SIZE 1024 | |
130 | ||
131 | struct symbol { | |
132 | struct symbol *next; | |
133 | struct module *module; | |
134 | unsigned int crc; | |
135 | int crc_valid; | |
136 | unsigned int weak:1; | |
040fcc81 SR |
137 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
138 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
139 | * (only for external modules) **/ | |
8e70c458 | 140 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 141 | enum export export; /* Type of export */ |
1da177e4 LT |
142 | char name[0]; |
143 | }; | |
144 | ||
145 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
146 | ||
147 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
148 | static inline unsigned int tdb_hash(const char *name) | |
149 | { | |
150 | unsigned value; /* Used to compute the hash value. */ | |
151 | unsigned i; /* Used to cycle through random values. */ | |
152 | ||
153 | /* Set the initial value from the key size. */ | |
154 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) | |
155 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); | |
156 | ||
157 | return (1103515243 * value + 12345); | |
158 | } | |
159 | ||
5c3ead8c SR |
160 | /** |
161 | * Allocate a new symbols for use in the hash of exported symbols or | |
162 | * the list of unresolved symbols per module | |
163 | **/ | |
164 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
165 | struct symbol *next) | |
1da177e4 LT |
166 | { |
167 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
168 | ||
169 | memset(s, 0, sizeof(*s)); | |
170 | strcpy(s->name, name); | |
171 | s->weak = weak; | |
172 | s->next = next; | |
173 | return s; | |
174 | } | |
175 | ||
176 | /* For the hash of exported symbols */ | |
bd5cbced RP |
177 | static struct symbol *new_symbol(const char *name, struct module *module, |
178 | enum export export) | |
1da177e4 LT |
179 | { |
180 | unsigned int hash; | |
181 | struct symbol *new; | |
182 | ||
183 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
184 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
185 | new->module = module; | |
bd5cbced | 186 | new->export = export; |
040fcc81 | 187 | return new; |
1da177e4 LT |
188 | } |
189 | ||
5c3ead8c | 190 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
191 | { |
192 | struct symbol *s; | |
193 | ||
194 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
195 | if (name[0] == '.') | |
196 | name++; | |
197 | ||
198 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { | |
199 | if (strcmp(s->name, name) == 0) | |
200 | return s; | |
201 | } | |
202 | return NULL; | |
203 | } | |
204 | ||
bd5cbced RP |
205 | static struct { |
206 | const char *str; | |
207 | enum export export; | |
208 | } export_list[] = { | |
209 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 210 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 211 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 212 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
213 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
214 | { .str = "(unknown)", .export = export_unknown }, | |
215 | }; | |
216 | ||
217 | ||
218 | static const char *export_str(enum export ex) | |
219 | { | |
220 | return export_list[ex].str; | |
221 | } | |
222 | ||
223 | static enum export export_no(const char * s) | |
224 | { | |
225 | int i; | |
534b89a9 SR |
226 | if (!s) |
227 | return export_unknown; | |
bd5cbced RP |
228 | for (i = 0; export_list[i].export != export_unknown; i++) { |
229 | if (strcmp(export_list[i].str, s) == 0) | |
230 | return export_list[i].export; | |
231 | } | |
232 | return export_unknown; | |
233 | } | |
234 | ||
235 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
236 | { | |
237 | if (sec == elf->export_sec) | |
238 | return export_plain; | |
c96fca21 SR |
239 | else if (sec == elf->export_unused_sec) |
240 | return export_unused; | |
bd5cbced RP |
241 | else if (sec == elf->export_gpl_sec) |
242 | return export_gpl; | |
c96fca21 SR |
243 | else if (sec == elf->export_unused_gpl_sec) |
244 | return export_unused_gpl; | |
bd5cbced RP |
245 | else if (sec == elf->export_gpl_future_sec) |
246 | return export_gpl_future; | |
247 | else | |
248 | return export_unknown; | |
249 | } | |
250 | ||
5c3ead8c SR |
251 | /** |
252 | * Add an exported symbol - it may have already been added without a | |
253 | * CRC, in this case just update the CRC | |
254 | **/ | |
bd5cbced RP |
255 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
256 | enum export export) | |
1da177e4 LT |
257 | { |
258 | struct symbol *s = find_symbol(name); | |
259 | ||
260 | if (!s) { | |
bd5cbced | 261 | s = new_symbol(name, mod, export); |
8e70c458 SR |
262 | } else { |
263 | if (!s->preloaded) { | |
7b75b13c | 264 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
265 | "was in %s%s\n", mod->name, name, |
266 | s->module->name, | |
267 | is_vmlinux(s->module->name) ?"":".ko"); | |
268 | } | |
1da177e4 | 269 | } |
8e70c458 | 270 | s->preloaded = 0; |
040fcc81 SR |
271 | s->vmlinux = is_vmlinux(mod->name); |
272 | s->kernel = 0; | |
bd5cbced | 273 | s->export = export; |
040fcc81 SR |
274 | return s; |
275 | } | |
276 | ||
277 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 278 | unsigned int crc, enum export export) |
040fcc81 SR |
279 | { |
280 | struct symbol *s = find_symbol(name); | |
281 | ||
282 | if (!s) | |
bd5cbced | 283 | s = new_symbol(name, mod, export); |
040fcc81 SR |
284 | s->crc = crc; |
285 | s->crc_valid = 1; | |
1da177e4 LT |
286 | } |
287 | ||
5c3ead8c | 288 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
289 | { |
290 | struct stat st; | |
291 | void *map; | |
292 | int fd; | |
293 | ||
294 | fd = open(filename, O_RDONLY); | |
295 | if (fd < 0 || fstat(fd, &st) != 0) | |
296 | return NULL; | |
297 | ||
298 | *size = st.st_size; | |
299 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
300 | close(fd); | |
301 | ||
302 | if (map == MAP_FAILED) | |
303 | return NULL; | |
304 | return map; | |
305 | } | |
306 | ||
5c3ead8c SR |
307 | /** |
308 | * Return a copy of the next line in a mmap'ed file. | |
309 | * spaces in the beginning of the line is trimmed away. | |
310 | * Return a pointer to a static buffer. | |
311 | **/ | |
312 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) | |
1da177e4 LT |
313 | { |
314 | static char line[4096]; | |
315 | int skip = 1; | |
316 | size_t len = 0; | |
317 | signed char *p = (signed char *)file + *pos; | |
318 | char *s = line; | |
319 | ||
320 | for (; *pos < size ; (*pos)++) | |
321 | { | |
322 | if (skip && isspace(*p)) { | |
323 | p++; | |
324 | continue; | |
325 | } | |
326 | skip = 0; | |
327 | if (*p != '\n' && (*pos < size)) { | |
328 | len++; | |
329 | *s++ = *p++; | |
330 | if (len > 4095) | |
331 | break; /* Too long, stop */ | |
332 | } else { | |
333 | /* End of string */ | |
334 | *s = '\0'; | |
335 | return line; | |
336 | } | |
337 | } | |
338 | /* End of buffer */ | |
339 | return NULL; | |
340 | } | |
341 | ||
5c3ead8c | 342 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
343 | { |
344 | munmap(file, size); | |
345 | } | |
346 | ||
85bd2fdd | 347 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
348 | { |
349 | unsigned int i; | |
85bd2fdd | 350 | Elf_Ehdr *hdr; |
1da177e4 LT |
351 | Elf_Shdr *sechdrs; |
352 | Elf_Sym *sym; | |
353 | ||
354 | hdr = grab_file(filename, &info->size); | |
355 | if (!hdr) { | |
356 | perror(filename); | |
6803dc0e | 357 | exit(1); |
1da177e4 LT |
358 | } |
359 | info->hdr = hdr; | |
85bd2fdd SR |
360 | if (info->size < sizeof(*hdr)) { |
361 | /* file too small, assume this is an empty .o file */ | |
362 | return 0; | |
363 | } | |
364 | /* Is this a valid ELF file? */ | |
365 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
366 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
367 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
368 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
369 | /* Not an ELF file - silently ignore it */ | |
370 | return 0; | |
371 | } | |
1da177e4 LT |
372 | /* Fix endianness in ELF header */ |
373 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
374 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
375 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
376 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
377 | sechdrs = (void *)hdr + hdr->e_shoff; | |
378 | info->sechdrs = sechdrs; | |
379 | ||
380 | /* Fix endianness in section headers */ | |
381 | for (i = 0; i < hdr->e_shnum; i++) { | |
382 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
383 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
384 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
385 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
386 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
387 | } | |
388 | /* Find symbol table. */ | |
389 | for (i = 1; i < hdr->e_shnum; i++) { | |
390 | const char *secstrings | |
391 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 392 | const char *secname; |
1da177e4 | 393 | |
85bd2fdd SR |
394 | if (sechdrs[i].sh_offset > info->size) { |
395 | fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr)); | |
396 | return 0; | |
397 | } | |
bd5cbced RP |
398 | secname = secstrings + sechdrs[i].sh_name; |
399 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
400 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
401 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
402 | } else if (strcmp(secname, "__ksymtab") == 0) |
403 | info->export_sec = i; | |
c96fca21 SR |
404 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
405 | info->export_unused_sec = i; | |
bd5cbced RP |
406 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
407 | info->export_gpl_sec = i; | |
c96fca21 SR |
408 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
409 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
410 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
411 | info->export_gpl_future_sec = i; | |
412 | ||
1da177e4 LT |
413 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
414 | continue; | |
415 | ||
416 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 417 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 418 | + sechdrs[i].sh_size; |
62070fa4 | 419 | info->strtab = (void *)hdr + |
1da177e4 LT |
420 | sechdrs[sechdrs[i].sh_link].sh_offset; |
421 | } | |
422 | if (!info->symtab_start) { | |
cb80514d | 423 | fatal("%s has no symtab?\n", filename); |
1da177e4 LT |
424 | } |
425 | /* Fix endianness in symbols */ | |
426 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
427 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
428 | sym->st_name = TO_NATIVE(sym->st_name); | |
429 | sym->st_value = TO_NATIVE(sym->st_value); | |
430 | sym->st_size = TO_NATIVE(sym->st_size); | |
431 | } | |
85bd2fdd | 432 | return 1; |
1da177e4 LT |
433 | } |
434 | ||
5c3ead8c | 435 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
436 | { |
437 | release_file(info->hdr, info->size); | |
438 | } | |
439 | ||
f7b05e64 LY |
440 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
441 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 442 | |
5c3ead8c SR |
443 | static void handle_modversions(struct module *mod, struct elf_info *info, |
444 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
445 | { |
446 | unsigned int crc; | |
bd5cbced | 447 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
448 | |
449 | switch (sym->st_shndx) { | |
450 | case SHN_COMMON: | |
cb80514d | 451 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
452 | break; |
453 | case SHN_ABS: | |
454 | /* CRC'd symbol */ | |
455 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
456 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
457 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
458 | export); | |
1da177e4 LT |
459 | } |
460 | break; | |
461 | case SHN_UNDEF: | |
462 | /* undefined symbol */ | |
463 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
464 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
465 | break; | |
466 | /* ignore global offset table */ | |
467 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
468 | break; | |
469 | /* ignore __this_module, it will be resolved shortly */ | |
470 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
471 | break; | |
8d529014 BC |
472 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
473 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
474 | /* add compatibility with older glibc */ | |
475 | #ifndef STT_SPARC_REGISTER | |
476 | #define STT_SPARC_REGISTER STT_REGISTER | |
477 | #endif | |
1da177e4 LT |
478 | if (info->hdr->e_machine == EM_SPARC || |
479 | info->hdr->e_machine == EM_SPARCV9) { | |
480 | /* Ignore register directives. */ | |
8d529014 | 481 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 482 | break; |
62070fa4 SR |
483 | if (symname[0] == '.') { |
484 | char *munged = strdup(symname); | |
485 | munged[0] = '_'; | |
486 | munged[1] = toupper(munged[1]); | |
487 | symname = munged; | |
488 | } | |
1da177e4 LT |
489 | } |
490 | #endif | |
62070fa4 | 491 | |
1da177e4 LT |
492 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
493 | strlen(MODULE_SYMBOL_PREFIX)) == 0) | |
494 | mod->unres = alloc_symbol(symname + | |
495 | strlen(MODULE_SYMBOL_PREFIX), | |
496 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
497 | mod->unres); | |
498 | break; | |
499 | default: | |
500 | /* All exported symbols */ | |
501 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
502 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
503 | export); | |
1da177e4 LT |
504 | } |
505 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
506 | mod->has_init = 1; | |
507 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
508 | mod->has_cleanup = 1; | |
509 | break; | |
510 | } | |
511 | } | |
512 | ||
5c3ead8c SR |
513 | /** |
514 | * Parse tag=value strings from .modinfo section | |
515 | **/ | |
1da177e4 LT |
516 | static char *next_string(char *string, unsigned long *secsize) |
517 | { | |
518 | /* Skip non-zero chars */ | |
519 | while (string[0]) { | |
520 | string++; | |
521 | if ((*secsize)-- <= 1) | |
522 | return NULL; | |
523 | } | |
524 | ||
525 | /* Skip any zero padding. */ | |
526 | while (!string[0]) { | |
527 | string++; | |
528 | if ((*secsize)-- <= 1) | |
529 | return NULL; | |
530 | } | |
531 | return string; | |
532 | } | |
533 | ||
b817f6fe SR |
534 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
535 | const char *tag, char *info) | |
1da177e4 LT |
536 | { |
537 | char *p; | |
538 | unsigned int taglen = strlen(tag); | |
539 | unsigned long size = modinfo_len; | |
540 | ||
b817f6fe SR |
541 | if (info) { |
542 | size -= info - (char *)modinfo; | |
543 | modinfo = next_string(info, &size); | |
544 | } | |
545 | ||
1da177e4 LT |
546 | for (p = modinfo; p; p = next_string(p, &size)) { |
547 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
548 | return p + taglen + 1; | |
549 | } | |
550 | return NULL; | |
551 | } | |
552 | ||
b817f6fe SR |
553 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
554 | const char *tag) | |
555 | ||
556 | { | |
557 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
558 | } | |
559 | ||
4c8fbca5 SR |
560 | /** |
561 | * Test if string s ends in string sub | |
562 | * return 0 if match | |
563 | **/ | |
564 | static int strrcmp(const char *s, const char *sub) | |
565 | { | |
566 | int slen, sublen; | |
62070fa4 | 567 | |
4c8fbca5 SR |
568 | if (!s || !sub) |
569 | return 1; | |
62070fa4 | 570 | |
4c8fbca5 SR |
571 | slen = strlen(s); |
572 | sublen = strlen(sub); | |
62070fa4 | 573 | |
4c8fbca5 SR |
574 | if ((slen == 0) || (sublen == 0)) |
575 | return 1; | |
576 | ||
577 | if (sublen > slen) | |
578 | return 1; | |
579 | ||
580 | return memcmp(s + slen - sublen, sub, sublen); | |
581 | } | |
582 | ||
583 | /** | |
584 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e SR |
585 | * |
586 | * Pattern 0: | |
587 | * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. | |
588 | * The pattern is identified by: | |
589 | * fromsec = .text.init.refok | .data.init.refok | |
590 | * | |
4c8fbca5 SR |
591 | * Pattern 1: |
592 | * If a module parameter is declared __initdata and permissions=0 | |
593 | * then this is legal despite the warning generated. | |
594 | * We cannot see value of permissions here, so just ignore | |
595 | * this pattern. | |
596 | * The pattern is identified by: | |
597 | * tosec = .init.data | |
9209aed0 | 598 | * fromsec = .data* |
4c8fbca5 | 599 | * atsym =__param* |
62070fa4 | 600 | * |
4c8fbca5 | 601 | * Pattern 2: |
72ee59b5 | 602 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
603 | * add, remove, probe functions etc. |
604 | * These functions may often be marked __init and we do not want to | |
605 | * warn here. | |
606 | * the pattern is identified by: | |
5ecdd0f6 | 607 | * tosec = .init.text | .exit.text | .init.data |
4c8fbca5 | 608 | * fromsec = .data |
aae5f662 | 609 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console |
ee6a8545 VG |
610 | * |
611 | * Pattern 3: | |
9bf8cb9b SR |
612 | * Whitelist all references from .pci_fixup* section to .init.text |
613 | * This is part of the PCI init when built-in | |
614 | * | |
615 | * Pattern 4: | |
616 | * Whitelist all refereces from .text.head to .init.data | |
617 | * Whitelist all refereces from .text.head to .init.text | |
618 | * | |
619 | * Pattern 5: | |
ee6a8545 VG |
620 | * Some symbols belong to init section but still it is ok to reference |
621 | * these from non-init sections as these symbols don't have any memory | |
622 | * allocated for them and symbol address and value are same. So even | |
623 | * if init section is freed, its ok to reference those symbols. | |
624 | * For ex. symbols marking the init section boundaries. | |
625 | * This pattern is identified by | |
626 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 627 | * |
5a4910fb SR |
628 | * Pattern 7: |
629 | * Logos used in drivers/video/logo reside in __initdata but the | |
630 | * funtion that references them are EXPORT_SYMBOL() so cannot be | |
631 | * marker __init. So we whitelist them here. | |
632 | * The pattern is: | |
633 | * tosec = .init.data | |
634 | * fromsec = .text* | |
635 | * refsymname = logo_ | |
b4d5171a SR |
636 | * |
637 | * Pattern 8: | |
638 | * Symbols contained in .paravirtprobe may safely reference .init.text. | |
639 | * The pattern is: | |
640 | * tosec = .init.text | |
641 | * fromsec = .paravirtprobe | |
642 | * | |
72280ede | 643 | * Pattern 10: |
cd547791 LY |
644 | * ia64 has machvec table for each platform and |
645 | * powerpc has a machine desc table for each platform. | |
646 | * It is mixture of function pointers of .init.text and .text. | |
647 | * fromsec = .machvec | .machine.desc | |
4c8fbca5 | 648 | **/ |
9e157a5a | 649 | static int secref_whitelist(const char *modname, const char *tosec, |
ee6a8545 VG |
650 | const char *fromsec, const char *atsym, |
651 | const char *refsymname) | |
4c8fbca5 SR |
652 | { |
653 | int f1 = 1, f2 = 1; | |
654 | const char **s; | |
655 | const char *pat2sym[] = { | |
72ee59b5 | 656 | "driver", |
5ecdd0f6 SR |
657 | "_template", /* scsi uses *_template a lot */ |
658 | "_sht", /* scsi also used *_sht to some extent */ | |
4c8fbca5 SR |
659 | "_ops", |
660 | "_probe", | |
661 | "_probe_one", | |
118c0ace | 662 | "_console", |
1833d6bc | 663 | "apic_es7000", |
4c8fbca5 SR |
664 | NULL |
665 | }; | |
62070fa4 | 666 | |
ee6a8545 VG |
667 | const char *pat3refsym[] = { |
668 | "__init_begin", | |
669 | "_sinittext", | |
670 | "_einittext", | |
671 | NULL | |
672 | }; | |
673 | ||
0e0d314e SR |
674 | /* Check for pattern 0 */ |
675 | if ((strcmp(fromsec, ".text.init.refok") == 0) || | |
676 | (strcmp(fromsec, ".data.init.refok") == 0)) | |
677 | return 1; | |
678 | ||
4c8fbca5 SR |
679 | /* Check for pattern 1 */ |
680 | if (strcmp(tosec, ".init.data") != 0) | |
681 | f1 = 0; | |
9209aed0 | 682 | if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
4c8fbca5 SR |
683 | f1 = 0; |
684 | if (strncmp(atsym, "__param", strlen("__param")) != 0) | |
685 | f1 = 0; | |
686 | ||
687 | if (f1) | |
688 | return f1; | |
689 | ||
690 | /* Check for pattern 2 */ | |
62070fa4 | 691 | if ((strcmp(tosec, ".init.text") != 0) && |
5ecdd0f6 SR |
692 | (strcmp(tosec, ".exit.text") != 0) && |
693 | (strcmp(tosec, ".init.data") != 0)) | |
4c8fbca5 SR |
694 | f2 = 0; |
695 | if (strcmp(fromsec, ".data") != 0) | |
696 | f2 = 0; | |
697 | ||
698 | for (s = pat2sym; *s; s++) | |
699 | if (strrcmp(atsym, *s) == 0) | |
700 | f1 = 1; | |
9e157a5a MD |
701 | if (f1 && f2) |
702 | return 1; | |
4c8fbca5 | 703 | |
9bf8cb9b SR |
704 | /* Check for pattern 3 */ |
705 | if ((strncmp(fromsec, ".pci_fixup", strlen(".pci_fixup")) == 0) && | |
706 | (strcmp(tosec, ".init.text") == 0)) | |
707 | return 1; | |
f8657e1b | 708 | |
aae5f662 | 709 | /* Check for pattern 4 */ |
9bf8cb9b SR |
710 | if ((strcmp(fromsec, ".text.head") == 0) && |
711 | ((strcmp(tosec, ".init.data") == 0) || | |
712 | (strcmp(tosec, ".init.text") == 0))) | |
713 | return 1; | |
714 | ||
715 | /* Check for pattern 5 */ | |
716 | for (s = pat3refsym; *s; s++) | |
717 | if (strcmp(refsymname, *s) == 0) | |
718 | return 1; | |
719 | ||
5a4910fb SR |
720 | /* Check for pattern 7 */ |
721 | if ((strcmp(tosec, ".init.data") == 0) && | |
722 | (strncmp(fromsec, ".text", strlen(".text")) == 0) && | |
723 | (strncmp(refsymname, "logo_", strlen("logo_")) == 0)) | |
724 | return 1; | |
b4d5171a SR |
725 | |
726 | /* Check for pattern 8 */ | |
727 | if ((strcmp(tosec, ".init.text") == 0) && | |
728 | (strcmp(fromsec, ".paravirtprobe") == 0)) | |
f8657e1b VG |
729 | return 1; |
730 | ||
72280ede | 731 | /* Check for pattern 10 */ |
cd547791 LY |
732 | if ((strcmp(fromsec, ".machvec") == 0) || |
733 | (strcmp(fromsec, ".machine.desc") == 0)) | |
72280ede YG |
734 | return 1; |
735 | ||
93659af1 | 736 | return 0; |
4c8fbca5 SR |
737 | } |
738 | ||
93684d3b SR |
739 | /** |
740 | * Find symbol based on relocation record info. | |
741 | * In some cases the symbol supplied is a valid symbol so | |
742 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
743 | * In other cases the symbol needs to be looked up in the symbol table | |
744 | * based on section and address. | |
745 | * **/ | |
746 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
747 | Elf_Sym *relsym) | |
748 | { | |
749 | Elf_Sym *sym; | |
750 | ||
751 | if (relsym->st_name != 0) | |
752 | return relsym; | |
753 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
754 | if (sym->st_shndx != relsym->st_shndx) | |
755 | continue; | |
756 | if (sym->st_value == addr) | |
757 | return sym; | |
758 | } | |
759 | return NULL; | |
760 | } | |
761 | ||
da68d61f DB |
762 | static inline int is_arm_mapping_symbol(const char *str) |
763 | { | |
764 | return str[0] == '$' && strchr("atd", str[1]) | |
765 | && (str[2] == '\0' || str[2] == '.'); | |
766 | } | |
767 | ||
768 | /* | |
769 | * If there's no name there, ignore it; likewise, ignore it if it's | |
770 | * one of the magic symbols emitted used by current ARM tools. | |
771 | * | |
772 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
773 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
774 | * only by merging __exit and __init sections into __text, bloating | |
775 | * the kernel (which is especially evil on embedded platforms). | |
776 | */ | |
777 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
778 | { | |
779 | const char *name = elf->strtab + sym->st_name; | |
780 | ||
781 | if (!name || !strlen(name)) | |
782 | return 0; | |
783 | return !is_arm_mapping_symbol(name); | |
784 | } | |
785 | ||
b39927cf | 786 | /* |
43c74d17 SR |
787 | * Find symbols before or equal addr and after addr - in the section sec. |
788 | * If we find two symbols with equal offset prefer one with a valid name. | |
789 | * The ELF format may have a better way to detect what type of symbol | |
790 | * it is, but this works for now. | |
b39927cf SR |
791 | **/ |
792 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
793 | const char *sec, | |
794 | Elf_Sym **before, Elf_Sym **after) | |
795 | { | |
796 | Elf_Sym *sym; | |
797 | Elf_Ehdr *hdr = elf->hdr; | |
798 | Elf_Addr beforediff = ~0; | |
799 | Elf_Addr afterdiff = ~0; | |
800 | const char *secstrings = (void *)hdr + | |
801 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 802 | |
b39927cf SR |
803 | *before = NULL; |
804 | *after = NULL; | |
805 | ||
806 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
807 | const char *symsec; | |
808 | ||
809 | if (sym->st_shndx >= SHN_LORESERVE) | |
810 | continue; | |
811 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
812 | if (strcmp(symsec, sec) != 0) | |
813 | continue; | |
da68d61f DB |
814 | if (!is_valid_name(elf, sym)) |
815 | continue; | |
b39927cf SR |
816 | if (sym->st_value <= addr) { |
817 | if ((addr - sym->st_value) < beforediff) { | |
818 | beforediff = addr - sym->st_value; | |
819 | *before = sym; | |
820 | } | |
43c74d17 | 821 | else if ((addr - sym->st_value) == beforediff) { |
da68d61f | 822 | *before = sym; |
43c74d17 | 823 | } |
b39927cf SR |
824 | } |
825 | else | |
826 | { | |
827 | if ((sym->st_value - addr) < afterdiff) { | |
828 | afterdiff = sym->st_value - addr; | |
829 | *after = sym; | |
830 | } | |
43c74d17 | 831 | else if ((sym->st_value - addr) == afterdiff) { |
da68d61f | 832 | *after = sym; |
43c74d17 | 833 | } |
b39927cf SR |
834 | } |
835 | } | |
836 | } | |
837 | ||
838 | /** | |
839 | * Print a warning about a section mismatch. | |
840 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 841 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
842 | **/ |
843 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
844 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
845 | { | |
93684d3b SR |
846 | const char *refsymname = ""; |
847 | Elf_Sym *before, *after; | |
848 | Elf_Sym *refsym; | |
b39927cf SR |
849 | Elf_Ehdr *hdr = elf->hdr; |
850 | Elf_Shdr *sechdrs = elf->sechdrs; | |
851 | const char *secstrings = (void *)hdr + | |
852 | sechdrs[hdr->e_shstrndx].sh_offset; | |
853 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 854 | |
b39927cf SR |
855 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
856 | ||
93684d3b SR |
857 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
858 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
859 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
860 | |
861 | /* check whitelist - we may ignore it */ | |
62070fa4 | 862 | if (before && |
9e157a5a | 863 | secref_whitelist(modname, secname, fromsec, |
ee6a8545 | 864 | elf->strtab + before->st_name, refsymname)) |
4c8fbca5 | 865 | return; |
62070fa4 | 866 | |
cd547791 LY |
867 | /* fromsec whitelist - without a valid 'before' |
868 | * powerpc has a GOT table in .got2 section */ | |
869 | if (strcmp(fromsec, ".got2") == 0) | |
870 | return; | |
871 | ||
b39927cf | 872 | if (before && after) { |
25601209 RK |
873 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
874 | "(between '%s' and '%s')\n", | |
875 | modname, fromsec, (unsigned long long)r.r_offset, | |
876 | secname, refsymname, | |
b39927cf | 877 | elf->strtab + before->st_name, |
b39927cf SR |
878 | elf->strtab + after->st_name); |
879 | } else if (before) { | |
25601209 RK |
880 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
881 | "(after '%s')\n", | |
882 | modname, fromsec, (unsigned long long)r.r_offset, | |
883 | secname, refsymname, | |
884 | elf->strtab + before->st_name); | |
b39927cf | 885 | } else if (after) { |
25601209 | 886 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
93684d3b | 887 | "before '%s' (at offset -0x%llx)\n", |
25601209 RK |
888 | modname, fromsec, (unsigned long long)r.r_offset, |
889 | secname, refsymname, | |
890 | elf->strtab + after->st_name); | |
b39927cf | 891 | } else { |
25601209 RK |
892 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n", |
893 | modname, fromsec, (unsigned long long)r.r_offset, | |
894 | secname, refsymname); | |
b39927cf SR |
895 | } |
896 | } | |
897 | ||
898 | /** | |
899 | * A module includes a number of sections that are discarded | |
900 | * either when loaded or when used as built-in. | |
901 | * For loaded modules all functions marked __init and all data | |
902 | * marked __initdata will be discarded when the module has been intialized. | |
903 | * Likewise for modules used built-in the sections marked __exit | |
904 | * are discarded because __exit marked function are supposed to be called | |
905 | * only when a moduel is unloaded which never happes for built-in modules. | |
906 | * The check_sec_ref() function traverses all relocation records | |
907 | * to find all references to a section that reference a section that will | |
908 | * be discarded and warns about it. | |
909 | **/ | |
910 | static void check_sec_ref(struct module *mod, const char *modname, | |
911 | struct elf_info *elf, | |
912 | int section(const char*), | |
913 | int section_ref_ok(const char *)) | |
914 | { | |
915 | int i; | |
916 | Elf_Sym *sym; | |
917 | Elf_Ehdr *hdr = elf->hdr; | |
918 | Elf_Shdr *sechdrs = elf->sechdrs; | |
919 | const char *secstrings = (void *)hdr + | |
920 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 921 | |
b39927cf SR |
922 | /* Walk through all sections */ |
923 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
924 | const char *name = secstrings + sechdrs[i].sh_name; |
925 | const char *secname; | |
926 | Elf_Rela r; | |
eae07ac6 | 927 | unsigned int r_sym; |
b39927cf | 928 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
929 | if (sechdrs[i].sh_type == SHT_RELA) { |
930 | Elf_Rela *rela; | |
931 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
932 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
933 | name += strlen(".rela"); | |
934 | if (section_ref_ok(name)) | |
935 | continue; | |
b39927cf | 936 | |
2c1a51f3 AN |
937 | for (rela = start; rela < stop; rela++) { |
938 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
939 | #if KERNEL_ELFCLASS == ELFCLASS64 |
940 | if (hdr->e_machine == EM_MIPS) { | |
941 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
942 | r_sym = TO_NATIVE(r_sym); | |
943 | } else { | |
944 | r.r_info = TO_NATIVE(rela->r_info); | |
945 | r_sym = ELF_R_SYM(r.r_info); | |
946 | } | |
947 | #else | |
948 | r.r_info = TO_NATIVE(rela->r_info); | |
949 | r_sym = ELF_R_SYM(r.r_info); | |
950 | #endif | |
2c1a51f3 | 951 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 952 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
953 | /* Skip special sections */ |
954 | if (sym->st_shndx >= SHN_LORESERVE) | |
955 | continue; | |
956 | ||
957 | secname = secstrings + | |
958 | sechdrs[sym->st_shndx].sh_name; | |
959 | if (section(secname)) | |
960 | warn_sec_mismatch(modname, name, | |
961 | elf, sym, r); | |
962 | } | |
963 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
964 | Elf_Rel *rel; | |
965 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
966 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
967 | name += strlen(".rel"); | |
968 | if (section_ref_ok(name)) | |
b39927cf SR |
969 | continue; |
970 | ||
2c1a51f3 AN |
971 | for (rel = start; rel < stop; rel++) { |
972 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
973 | #if KERNEL_ELFCLASS == ELFCLASS64 |
974 | if (hdr->e_machine == EM_MIPS) { | |
975 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
976 | r_sym = TO_NATIVE(r_sym); | |
977 | } else { | |
978 | r.r_info = TO_NATIVE(rel->r_info); | |
979 | r_sym = ELF_R_SYM(r.r_info); | |
980 | } | |
981 | #else | |
982 | r.r_info = TO_NATIVE(rel->r_info); | |
983 | r_sym = ELF_R_SYM(r.r_info); | |
984 | #endif | |
2c1a51f3 | 985 | r.r_addend = 0; |
eae07ac6 | 986 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
987 | /* Skip special sections */ |
988 | if (sym->st_shndx >= SHN_LORESERVE) | |
989 | continue; | |
990 | ||
991 | secname = secstrings + | |
992 | sechdrs[sym->st_shndx].sh_name; | |
993 | if (section(secname)) | |
994 | warn_sec_mismatch(modname, name, | |
995 | elf, sym, r); | |
996 | } | |
b39927cf SR |
997 | } |
998 | } | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * Functions used only during module init is marked __init and is stored in | |
1003 | * a .init.text section. Likewise data is marked __initdata and stored in | |
1004 | * a .init.data section. | |
1005 | * If this section is one of these sections return 1 | |
1006 | * See include/linux/init.h for the details | |
1007 | **/ | |
1008 | static int init_section(const char *name) | |
1009 | { | |
1010 | if (strcmp(name, ".init") == 0) | |
1011 | return 1; | |
1012 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
1013 | return 1; | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * Identify sections from which references to a .init section is OK. | |
62070fa4 | 1019 | * |
b39927cf SR |
1020 | * Unfortunately references to read only data that referenced .init |
1021 | * sections had to be excluded. Almost all of these are false | |
1022 | * positives, they are created by gcc. The downside of excluding rodata | |
1023 | * is that there really are some user references from rodata to | |
1024 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 1025 | * |
b39927cf SR |
1026 | * const struct consw vga_con = { |
1027 | * con_startup: vgacon_startup, | |
1028 | * | |
1029 | * where vgacon_startup is __init. If you want to wade through the false | |
1030 | * positives, take out the check for rodata. | |
1031 | **/ | |
1032 | static int init_section_ref_ok(const char *name) | |
1033 | { | |
1034 | const char **s; | |
1035 | /* Absolute section names */ | |
1036 | const char *namelist1[] = { | |
1037 | ".init", | |
9209aed0 SR |
1038 | ".opd", /* see comment [OPD] at exit_section_ref_ok() */ |
1039 | ".toc1", /* used by ppc64 */ | |
b39927cf | 1040 | ".stab", |
742433b0 | 1041 | ".data.rel.ro", /* used by parisc64 */ |
139ec7c4 | 1042 | ".parainstructions", |
b39927cf | 1043 | ".text.lock", |
9209aed0 | 1044 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
1045 | ".pci_fixup_header", |
1046 | ".pci_fixup_final", | |
1047 | ".pdr", | |
1048 | "__param", | |
468d9494 AV |
1049 | "__ex_table", |
1050 | ".fixup", | |
35899c57 | 1051 | ".smp_locks", |
909252d2 | 1052 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
21c4ff80 BH |
1053 | "__ftr_fixup", /* powerpc cpu feature fixup */ |
1054 | "__fw_ftr_fixup", /* powerpc firmware feature fixup */ | |
2648a53a | 1055 | ".cranges", /* used by sh64 */ |
b39927cf SR |
1056 | NULL |
1057 | }; | |
1058 | /* Start of section names */ | |
1059 | const char *namelist2[] = { | |
1060 | ".init.", | |
1061 | ".altinstructions", | |
1062 | ".eh_frame", | |
1063 | ".debug", | |
139ec7c4 | 1064 | ".parainstructions", |
742433b0 | 1065 | ".rodata", |
b39927cf SR |
1066 | NULL |
1067 | }; | |
6e10133f SR |
1068 | /* part of section name */ |
1069 | const char *namelist3 [] = { | |
1070 | ".unwind", /* sample: IA_64.unwind.init.text */ | |
1071 | NULL | |
1072 | }; | |
1073 | ||
b39927cf SR |
1074 | for (s = namelist1; *s; s++) |
1075 | if (strcmp(*s, name) == 0) | |
1076 | return 1; | |
62070fa4 | 1077 | for (s = namelist2; *s; s++) |
b39927cf SR |
1078 | if (strncmp(*s, name, strlen(*s)) == 0) |
1079 | return 1; | |
62070fa4 | 1080 | for (s = namelist3; *s; s++) |
e835a39c | 1081 | if (strstr(name, *s) != NULL) |
6e10133f | 1082 | return 1; |
468d9494 AV |
1083 | if (strrcmp(name, ".init") == 0) |
1084 | return 1; | |
b39927cf SR |
1085 | return 0; |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Functions used only during module exit is marked __exit and is stored in | |
1090 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
1091 | * a .exit.data section. | |
1092 | * If this section is one of these sections return 1 | |
1093 | * See include/linux/init.h for the details | |
1094 | **/ | |
1095 | static int exit_section(const char *name) | |
1096 | { | |
1097 | if (strcmp(name, ".exit.text") == 0) | |
1098 | return 1; | |
1099 | if (strcmp(name, ".exit.data") == 0) | |
1100 | return 1; | |
1101 | return 0; | |
62070fa4 | 1102 | |
b39927cf SR |
1103 | } |
1104 | ||
1105 | /* | |
1106 | * Identify sections from which references to a .exit section is OK. | |
62070fa4 | 1107 | * |
b39927cf SR |
1108 | * [OPD] Keith Ownes <kaos@sgi.com> commented: |
1109 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
1110 | * section, not the ia64 .opd section. | |
1111 | * ia64 .opd should not point to discarded sections. | |
5ecdd0f6 | 1112 | * [.rodata] like for .init.text we ignore .rodata references -same reason |
b39927cf SR |
1113 | **/ |
1114 | static int exit_section_ref_ok(const char *name) | |
1115 | { | |
1116 | const char **s; | |
1117 | /* Absolute section names */ | |
1118 | const char *namelist1[] = { | |
1119 | ".exit.text", | |
1120 | ".exit.data", | |
1121 | ".init.text", | |
5ecdd0f6 | 1122 | ".rodata", |
b39927cf | 1123 | ".opd", /* See comment [OPD] */ |
9209aed0 | 1124 | ".toc1", /* used by ppc64 */ |
b39927cf SR |
1125 | ".altinstructions", |
1126 | ".pdr", | |
9209aed0 | 1127 | "__bug_table", /* used by powerpc for BUG() */ |
b39927cf SR |
1128 | ".exitcall.exit", |
1129 | ".eh_frame", | |
acd19499 | 1130 | ".parainstructions", |
b39927cf | 1131 | ".stab", |
468d9494 AV |
1132 | "__ex_table", |
1133 | ".fixup", | |
35899c57 | 1134 | ".smp_locks", |
909252d2 | 1135 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ |
2648a53a | 1136 | ".cranges", /* used by sh64 */ |
b39927cf SR |
1137 | NULL |
1138 | }; | |
1139 | /* Start of section names */ | |
1140 | const char *namelist2[] = { | |
1141 | ".debug", | |
1142 | NULL | |
1143 | }; | |
6e10133f SR |
1144 | /* part of section name */ |
1145 | const char *namelist3 [] = { | |
1146 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
1147 | NULL | |
1148 | }; | |
62070fa4 | 1149 | |
b39927cf SR |
1150 | for (s = namelist1; *s; s++) |
1151 | if (strcmp(*s, name) == 0) | |
1152 | return 1; | |
62070fa4 | 1153 | for (s = namelist2; *s; s++) |
b39927cf SR |
1154 | if (strncmp(*s, name, strlen(*s)) == 0) |
1155 | return 1; | |
62070fa4 | 1156 | for (s = namelist3; *s; s++) |
e835a39c | 1157 | if (strstr(name, *s) != NULL) |
6e10133f | 1158 | return 1; |
b39927cf SR |
1159 | return 0; |
1160 | } | |
1161 | ||
5c3ead8c | 1162 | static void read_symbols(char *modname) |
1da177e4 LT |
1163 | { |
1164 | const char *symname; | |
1165 | char *version; | |
b817f6fe | 1166 | char *license; |
1da177e4 LT |
1167 | struct module *mod; |
1168 | struct elf_info info = { }; | |
1169 | Elf_Sym *sym; | |
1170 | ||
85bd2fdd SR |
1171 | if (!parse_elf(&info, modname)) |
1172 | return; | |
1da177e4 LT |
1173 | |
1174 | mod = new_module(modname); | |
1175 | ||
1176 | /* When there's no vmlinux, don't print warnings about | |
1177 | * unresolved symbols (since there'll be too many ;) */ | |
1178 | if (is_vmlinux(modname)) { | |
1da177e4 | 1179 | have_vmlinux = 1; |
1da177e4 LT |
1180 | mod->skip = 1; |
1181 | } | |
1182 | ||
b817f6fe SR |
1183 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1184 | while (license) { | |
1185 | if (license_is_gpl_compatible(license)) | |
1186 | mod->gpl_compatible = 1; | |
1187 | else { | |
1188 | mod->gpl_compatible = 0; | |
1189 | break; | |
1190 | } | |
1191 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1192 | "license", license); | |
1193 | } | |
1194 | ||
1da177e4 LT |
1195 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1196 | symname = info.strtab + sym->st_name; | |
1197 | ||
1198 | handle_modversions(mod, &info, sym, symname); | |
1199 | handle_moddevtable(mod, &info, sym, symname); | |
1200 | } | |
b39927cf SR |
1201 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
1202 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1da177e4 LT |
1203 | |
1204 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1205 | if (version) | |
1206 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1207 | version - (char *)info.hdr); | |
1208 | if (version || (all_versions && !is_vmlinux(modname))) | |
1209 | get_src_version(modname, mod->srcversion, | |
1210 | sizeof(mod->srcversion)-1); | |
1211 | ||
1212 | parse_elf_finish(&info); | |
1213 | ||
1214 | /* Our trick to get versioning for struct_module - it's | |
1215 | * never passed as an argument to an exported function, so | |
1216 | * the automatic versioning doesn't pick it up, but it's really | |
1217 | * important anyhow */ | |
1218 | if (modversions) | |
1219 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1220 | } | |
1221 | ||
1222 | #define SZ 500 | |
1223 | ||
1224 | /* We first write the generated file into memory using the | |
1225 | * following helper, then compare to the file on disk and | |
1226 | * only update the later if anything changed */ | |
1227 | ||
5c3ead8c SR |
1228 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1229 | const char *fmt, ...) | |
1da177e4 LT |
1230 | { |
1231 | char tmp[SZ]; | |
1232 | int len; | |
1233 | va_list ap; | |
62070fa4 | 1234 | |
1da177e4 LT |
1235 | va_start(ap, fmt); |
1236 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1237 | buf_write(buf, tmp, len); |
1da177e4 LT |
1238 | va_end(ap); |
1239 | } | |
1240 | ||
5c3ead8c | 1241 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1242 | { |
1243 | if (buf->size - buf->pos < len) { | |
7670f023 | 1244 | buf->size += len + SZ; |
1da177e4 LT |
1245 | buf->p = realloc(buf->p, buf->size); |
1246 | } | |
1247 | strncpy(buf->p + buf->pos, s, len); | |
1248 | buf->pos += len; | |
1249 | } | |
1250 | ||
c96fca21 SR |
1251 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1252 | { | |
1253 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1254 | ||
1255 | switch (exp) { | |
1256 | case export_gpl: | |
1257 | fatal("modpost: GPL-incompatible module %s%s " | |
1258 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1259 | break; | |
1260 | case export_unused_gpl: | |
1261 | fatal("modpost: GPL-incompatible module %s%s " | |
1262 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1263 | break; | |
1264 | case export_gpl_future: | |
1265 | warn("modpost: GPL-incompatible module %s%s " | |
1266 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1267 | break; | |
1268 | case export_plain: | |
1269 | case export_unused: | |
1270 | case export_unknown: | |
1271 | /* ignore */ | |
1272 | break; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | static void check_for_unused(enum export exp, const char* m, const char* s) | |
1277 | { | |
1278 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1279 | ||
1280 | switch (exp) { | |
1281 | case export_unused: | |
1282 | case export_unused_gpl: | |
1283 | warn("modpost: module %s%s " | |
1284 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1285 | break; | |
1286 | default: | |
1287 | /* ignore */ | |
1288 | break; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1293 | { |
1294 | struct symbol *s, *exp; | |
1295 | ||
1296 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1297 | const char *basename; |
b817f6fe SR |
1298 | exp = find_symbol(s->name); |
1299 | if (!exp || exp->module == mod) | |
1300 | continue; | |
6449bd62 | 1301 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1302 | if (basename) |
1303 | basename++; | |
c96fca21 SR |
1304 | else |
1305 | basename = mod->name; | |
1306 | if (!mod->gpl_compatible) | |
1307 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1308 | check_for_unused(exp->export, basename, exp->name); | |
b817f6fe SR |
1309 | } |
1310 | } | |
1311 | ||
5c3ead8c SR |
1312 | /** |
1313 | * Header for the generated file | |
1314 | **/ | |
1315 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1316 | { |
1317 | buf_printf(b, "#include <linux/module.h>\n"); | |
1318 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1319 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1320 | buf_printf(b, "\n"); | |
1321 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1322 | buf_printf(b, "\n"); | |
1da177e4 LT |
1323 | buf_printf(b, "struct module __this_module\n"); |
1324 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1325 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1326 | if (mod->has_init) |
1327 | buf_printf(b, " .init = init_module,\n"); | |
1328 | if (mod->has_cleanup) | |
1329 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1330 | " .exit = cleanup_module,\n" | |
1331 | "#endif\n"); | |
e61a1c1c | 1332 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1333 | buf_printf(b, "};\n"); |
1334 | } | |
1335 | ||
5c3ead8c SR |
1336 | /** |
1337 | * Record CRCs for unresolved symbols | |
1338 | **/ | |
c53ddacd | 1339 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1340 | { |
1341 | struct symbol *s, *exp; | |
c53ddacd | 1342 | int err = 0; |
1da177e4 LT |
1343 | |
1344 | for (s = mod->unres; s; s = s->next) { | |
1345 | exp = find_symbol(s->name); | |
1346 | if (!exp || exp->module == mod) { | |
c53ddacd | 1347 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1348 | if (warn_unresolved) { |
1349 | warn("\"%s\" [%s.ko] undefined!\n", | |
1350 | s->name, mod->name); | |
1351 | } else { | |
1352 | merror("\"%s\" [%s.ko] undefined!\n", | |
1353 | s->name, mod->name); | |
1354 | err = 1; | |
1355 | } | |
c53ddacd | 1356 | } |
1da177e4 LT |
1357 | continue; |
1358 | } | |
1359 | s->module = exp->module; | |
1360 | s->crc_valid = exp->crc_valid; | |
1361 | s->crc = exp->crc; | |
1362 | } | |
1363 | ||
1364 | if (!modversions) | |
c53ddacd | 1365 | return err; |
1da177e4 LT |
1366 | |
1367 | buf_printf(b, "\n"); | |
1368 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1369 | buf_printf(b, "__attribute_used__\n"); | |
1370 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1371 | ||
1372 | for (s = mod->unres; s; s = s->next) { | |
1373 | if (!s->module) { | |
1374 | continue; | |
1375 | } | |
1376 | if (!s->crc_valid) { | |
cb80514d | 1377 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1378 | s->name, mod->name); |
1379 | continue; | |
1380 | } | |
1381 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1382 | } | |
1383 | ||
1384 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1385 | |
1386 | return err; | |
1da177e4 LT |
1387 | } |
1388 | ||
5c3ead8c SR |
1389 | static void add_depends(struct buffer *b, struct module *mod, |
1390 | struct module *modules) | |
1da177e4 LT |
1391 | { |
1392 | struct symbol *s; | |
1393 | struct module *m; | |
1394 | int first = 1; | |
1395 | ||
1396 | for (m = modules; m; m = m->next) { | |
1397 | m->seen = is_vmlinux(m->name); | |
1398 | } | |
1399 | ||
1400 | buf_printf(b, "\n"); | |
1401 | buf_printf(b, "static const char __module_depends[]\n"); | |
1402 | buf_printf(b, "__attribute_used__\n"); | |
1403 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1404 | buf_printf(b, "\"depends="); | |
1405 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1406 | const char *p; |
1da177e4 LT |
1407 | if (!s->module) |
1408 | continue; | |
1409 | ||
1410 | if (s->module->seen) | |
1411 | continue; | |
1412 | ||
1413 | s->module->seen = 1; | |
a61b2dfd SR |
1414 | if ((p = strrchr(s->module->name, '/')) != NULL) |
1415 | p++; | |
1416 | else | |
1417 | p = s->module->name; | |
1418 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1419 | first = 0; |
1420 | } | |
1421 | buf_printf(b, "\";\n"); | |
1422 | } | |
1423 | ||
5c3ead8c | 1424 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1425 | { |
1426 | if (mod->srcversion[0]) { | |
1427 | buf_printf(b, "\n"); | |
1428 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1429 | mod->srcversion); | |
1430 | } | |
1431 | } | |
1432 | ||
5c3ead8c | 1433 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1434 | { |
1435 | char *tmp; | |
1436 | FILE *file; | |
1437 | struct stat st; | |
1438 | ||
1439 | file = fopen(fname, "r"); | |
1440 | if (!file) | |
1441 | goto write; | |
1442 | ||
1443 | if (fstat(fileno(file), &st) < 0) | |
1444 | goto close_write; | |
1445 | ||
1446 | if (st.st_size != b->pos) | |
1447 | goto close_write; | |
1448 | ||
1449 | tmp = NOFAIL(malloc(b->pos)); | |
1450 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1451 | goto free_write; | |
1452 | ||
1453 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1454 | goto free_write; | |
1455 | ||
1456 | free(tmp); | |
1457 | fclose(file); | |
1458 | return; | |
1459 | ||
1460 | free_write: | |
1461 | free(tmp); | |
1462 | close_write: | |
1463 | fclose(file); | |
1464 | write: | |
1465 | file = fopen(fname, "w"); | |
1466 | if (!file) { | |
1467 | perror(fname); | |
1468 | exit(1); | |
1469 | } | |
1470 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1471 | perror(fname); | |
1472 | exit(1); | |
1473 | } | |
1474 | fclose(file); | |
1475 | } | |
1476 | ||
bd5cbced | 1477 | /* parse Module.symvers file. line format: |
534b89a9 | 1478 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1479 | **/ |
040fcc81 | 1480 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1481 | { |
1482 | unsigned long size, pos = 0; | |
1483 | void *file = grab_file(fname, &size); | |
1484 | char *line; | |
1485 | ||
1486 | if (!file) | |
1487 | /* No symbol versions, silently ignore */ | |
1488 | return; | |
1489 | ||
1490 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1491 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1492 | unsigned int crc; |
1493 | struct module *mod; | |
040fcc81 | 1494 | struct symbol *s; |
1da177e4 LT |
1495 | |
1496 | if (!(symname = strchr(line, '\t'))) | |
1497 | goto fail; | |
1498 | *symname++ = '\0'; | |
1499 | if (!(modname = strchr(symname, '\t'))) | |
1500 | goto fail; | |
1501 | *modname++ = '\0'; | |
9ac545b0 | 1502 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1503 | *export++ = '\0'; |
534b89a9 SR |
1504 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1505 | *end = '\0'; | |
1da177e4 LT |
1506 | crc = strtoul(line, &d, 16); |
1507 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1508 | goto fail; | |
1509 | ||
1510 | if (!(mod = find_module(modname))) { | |
1511 | if (is_vmlinux(modname)) { | |
1512 | have_vmlinux = 1; | |
1513 | } | |
1514 | mod = new_module(NOFAIL(strdup(modname))); | |
1515 | mod->skip = 1; | |
1516 | } | |
bd5cbced | 1517 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1518 | s->kernel = kernel; |
1519 | s->preloaded = 1; | |
bd5cbced | 1520 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1521 | } |
1522 | return; | |
1523 | fail: | |
1524 | fatal("parse error in symbol dump file\n"); | |
1525 | } | |
1526 | ||
040fcc81 SR |
1527 | /* For normal builds always dump all symbols. |
1528 | * For external modules only dump symbols | |
1529 | * that are not read from kernel Module.symvers. | |
1530 | **/ | |
1531 | static int dump_sym(struct symbol *sym) | |
1532 | { | |
1533 | if (!external_module) | |
1534 | return 1; | |
1535 | if (sym->vmlinux || sym->kernel) | |
1536 | return 0; | |
1537 | return 1; | |
1538 | } | |
62070fa4 | 1539 | |
5c3ead8c | 1540 | static void write_dump(const char *fname) |
1da177e4 LT |
1541 | { |
1542 | struct buffer buf = { }; | |
1543 | struct symbol *symbol; | |
1544 | int n; | |
1545 | ||
1546 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1547 | symbol = symbolhash[n]; | |
1548 | while (symbol) { | |
040fcc81 | 1549 | if (dump_sym(symbol)) |
bd5cbced | 1550 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1551 | symbol->crc, symbol->name, |
bd5cbced RP |
1552 | symbol->module->name, |
1553 | export_str(symbol->export)); | |
1da177e4 LT |
1554 | symbol = symbol->next; |
1555 | } | |
1556 | } | |
1557 | write_if_changed(&buf, fname); | |
1558 | } | |
1559 | ||
5c3ead8c | 1560 | int main(int argc, char **argv) |
1da177e4 LT |
1561 | { |
1562 | struct module *mod; | |
1563 | struct buffer buf = { }; | |
1564 | char fname[SZ]; | |
040fcc81 SR |
1565 | char *kernel_read = NULL, *module_read = NULL; |
1566 | char *dump_write = NULL; | |
1da177e4 | 1567 | int opt; |
c53ddacd | 1568 | int err; |
1da177e4 | 1569 | |
c53ddacd | 1570 | while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) { |
1da177e4 LT |
1571 | switch(opt) { |
1572 | case 'i': | |
040fcc81 SR |
1573 | kernel_read = optarg; |
1574 | break; | |
1575 | case 'I': | |
1576 | module_read = optarg; | |
1577 | external_module = 1; | |
1da177e4 LT |
1578 | break; |
1579 | case 'm': | |
1580 | modversions = 1; | |
1581 | break; | |
1582 | case 'o': | |
1583 | dump_write = optarg; | |
1584 | break; | |
1585 | case 'a': | |
1586 | all_versions = 1; | |
1587 | break; | |
c53ddacd KK |
1588 | case 'w': |
1589 | warn_unresolved = 1; | |
1590 | break; | |
1da177e4 LT |
1591 | default: |
1592 | exit(1); | |
1593 | } | |
1594 | } | |
1595 | ||
040fcc81 SR |
1596 | if (kernel_read) |
1597 | read_dump(kernel_read, 1); | |
1598 | if (module_read) | |
1599 | read_dump(module_read, 0); | |
1da177e4 LT |
1600 | |
1601 | while (optind < argc) { | |
1602 | read_symbols(argv[optind++]); | |
1603 | } | |
1604 | ||
b817f6fe SR |
1605 | for (mod = modules; mod; mod = mod->next) { |
1606 | if (mod->skip) | |
1607 | continue; | |
c96fca21 | 1608 | check_exports(mod); |
b817f6fe SR |
1609 | } |
1610 | ||
c53ddacd KK |
1611 | err = 0; |
1612 | ||
1da177e4 LT |
1613 | for (mod = modules; mod; mod = mod->next) { |
1614 | if (mod->skip) | |
1615 | continue; | |
1616 | ||
1617 | buf.pos = 0; | |
1618 | ||
1619 | add_header(&buf, mod); | |
c53ddacd | 1620 | err |= add_versions(&buf, mod); |
1da177e4 LT |
1621 | add_depends(&buf, mod, modules); |
1622 | add_moddevtable(&buf, mod); | |
1623 | add_srcversion(&buf, mod); | |
1624 | ||
1625 | sprintf(fname, "%s.mod.c", mod->name); | |
1626 | write_if_changed(&buf, fname); | |
1627 | } | |
1628 | ||
1629 | if (dump_write) | |
1630 | write_dump(dump_write); | |
1631 | ||
c53ddacd | 1632 | return err; |
1da177e4 | 1633 | } |