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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 | |
df578e7d | 5 | * Copyright 2006-2008 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 | ||
b2e3e658 MD |
14 | #define _GNU_SOURCE |
15 | #include <stdio.h> | |
1da177e4 LT |
16 | #include <ctype.h> |
17 | #include "modpost.h" | |
5a865c06 | 18 | #include "../../include/generated/autoconf.h" |
b817f6fe | 19 | #include "../../include/linux/license.h" |
1da177e4 | 20 | |
9e1b9b80 AJ |
21 | /* Some toolchains use a `_' prefix for all user symbols. */ |
22 | #ifdef CONFIG_SYMBOL_PREFIX | |
23 | #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX | |
24 | #else | |
25 | #define MODULE_SYMBOL_PREFIX "" | |
26 | #endif | |
27 | ||
28 | ||
1da177e4 LT |
29 | /* Are we using CONFIG_MODVERSIONS? */ |
30 | int modversions = 0; | |
31 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
32 | int have_vmlinux = 0; | |
33 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
34 | static int all_versions = 0; | |
040fcc81 SR |
35 | /* If we are modposting external module set to 1 */ |
36 | static int external_module = 0; | |
8d8d8289 SR |
37 | /* Warn about section mismatch in vmlinux if set to 1 */ |
38 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
39 | /* Only warn about unresolved symbols */ |
40 | static int warn_unresolved = 0; | |
bd5cbced | 41 | /* How a symbol is exported */ |
588ccd73 SR |
42 | static int sec_mismatch_count = 0; |
43 | static int sec_mismatch_verbose = 1; | |
44 | ||
c96fca21 SR |
45 | enum export { |
46 | export_plain, export_unused, export_gpl, | |
47 | export_unused_gpl, export_gpl_future, export_unknown | |
48 | }; | |
1da177e4 | 49 | |
6d9a89ea AK |
50 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
51 | ||
52 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
53 | { |
54 | va_list arglist; | |
55 | ||
56 | fprintf(stderr, "FATAL: "); | |
57 | ||
58 | va_start(arglist, fmt); | |
59 | vfprintf(stderr, fmt, arglist); | |
60 | va_end(arglist); | |
61 | ||
62 | exit(1); | |
63 | } | |
64 | ||
6d9a89ea | 65 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
66 | { |
67 | va_list arglist; | |
68 | ||
69 | fprintf(stderr, "WARNING: "); | |
70 | ||
71 | va_start(arglist, fmt); | |
72 | vfprintf(stderr, fmt, arglist); | |
73 | va_end(arglist); | |
74 | } | |
75 | ||
6d9a89ea | 76 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
77 | { |
78 | va_list arglist; | |
79 | ||
80 | fprintf(stderr, "ERROR: "); | |
81 | ||
82 | va_start(arglist, fmt); | |
83 | vfprintf(stderr, fmt, arglist); | |
84 | va_end(arglist); | |
85 | } | |
86 | ||
040fcc81 SR |
87 | static int is_vmlinux(const char *modname) |
88 | { | |
89 | const char *myname; | |
90 | ||
df578e7d SR |
91 | myname = strrchr(modname, '/'); |
92 | if (myname) | |
040fcc81 SR |
93 | myname++; |
94 | else | |
95 | myname = modname; | |
96 | ||
741f98fe SR |
97 | return (strcmp(myname, "vmlinux") == 0) || |
98 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
99 | } |
100 | ||
1da177e4 LT |
101 | void *do_nofail(void *ptr, const char *expr) |
102 | { | |
df578e7d | 103 | if (!ptr) |
1da177e4 | 104 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 105 | |
1da177e4 LT |
106 | return ptr; |
107 | } | |
108 | ||
109 | /* A list of all modules we processed */ | |
1da177e4 LT |
110 | static struct module *modules; |
111 | ||
5c3ead8c | 112 | static struct module *find_module(char *modname) |
1da177e4 LT |
113 | { |
114 | struct module *mod; | |
115 | ||
116 | for (mod = modules; mod; mod = mod->next) | |
117 | if (strcmp(mod->name, modname) == 0) | |
118 | break; | |
119 | return mod; | |
120 | } | |
121 | ||
5c3ead8c | 122 | static struct module *new_module(char *modname) |
1da177e4 LT |
123 | { |
124 | struct module *mod; | |
125 | char *p, *s; | |
62070fa4 | 126 | |
1da177e4 LT |
127 | mod = NOFAIL(malloc(sizeof(*mod))); |
128 | memset(mod, 0, sizeof(*mod)); | |
129 | p = NOFAIL(strdup(modname)); | |
130 | ||
131 | /* strip trailing .o */ | |
df578e7d SR |
132 | s = strrchr(p, '.'); |
133 | if (s != NULL) | |
1da177e4 LT |
134 | if (strcmp(s, ".o") == 0) |
135 | *s = '\0'; | |
136 | ||
137 | /* add to list */ | |
138 | mod->name = p; | |
b817f6fe | 139 | mod->gpl_compatible = -1; |
1da177e4 LT |
140 | mod->next = modules; |
141 | modules = mod; | |
142 | ||
143 | return mod; | |
144 | } | |
145 | ||
146 | /* A hash of all exported symbols, | |
147 | * struct symbol is also used for lists of unresolved symbols */ | |
148 | ||
149 | #define SYMBOL_HASH_SIZE 1024 | |
150 | ||
151 | struct symbol { | |
152 | struct symbol *next; | |
153 | struct module *module; | |
154 | unsigned int crc; | |
155 | int crc_valid; | |
156 | unsigned int weak:1; | |
040fcc81 SR |
157 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
158 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
159 | * (only for external modules) **/ | |
8e70c458 | 160 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 161 | enum export export; /* Type of export */ |
1da177e4 LT |
162 | char name[0]; |
163 | }; | |
164 | ||
165 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
166 | ||
167 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
168 | static inline unsigned int tdb_hash(const char *name) | |
169 | { | |
170 | unsigned value; /* Used to compute the hash value. */ | |
171 | unsigned i; /* Used to cycle through random values. */ | |
172 | ||
173 | /* Set the initial value from the key size. */ | |
df578e7d | 174 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
175 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
176 | ||
177 | return (1103515243 * value + 12345); | |
178 | } | |
179 | ||
5c3ead8c SR |
180 | /** |
181 | * Allocate a new symbols for use in the hash of exported symbols or | |
182 | * the list of unresolved symbols per module | |
183 | **/ | |
184 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
185 | struct symbol *next) | |
1da177e4 LT |
186 | { |
187 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
188 | ||
189 | memset(s, 0, sizeof(*s)); | |
190 | strcpy(s->name, name); | |
191 | s->weak = weak; | |
192 | s->next = next; | |
193 | return s; | |
194 | } | |
195 | ||
196 | /* For the hash of exported symbols */ | |
bd5cbced RP |
197 | static struct symbol *new_symbol(const char *name, struct module *module, |
198 | enum export export) | |
1da177e4 LT |
199 | { |
200 | unsigned int hash; | |
201 | struct symbol *new; | |
202 | ||
203 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
204 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
205 | new->module = module; | |
bd5cbced | 206 | new->export = export; |
040fcc81 | 207 | return new; |
1da177e4 LT |
208 | } |
209 | ||
5c3ead8c | 210 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
211 | { |
212 | struct symbol *s; | |
213 | ||
214 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
215 | if (name[0] == '.') | |
216 | name++; | |
217 | ||
df578e7d | 218 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
219 | if (strcmp(s->name, name) == 0) |
220 | return s; | |
221 | } | |
222 | return NULL; | |
223 | } | |
224 | ||
bd5cbced RP |
225 | static struct { |
226 | const char *str; | |
227 | enum export export; | |
228 | } export_list[] = { | |
229 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 230 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 231 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 232 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
233 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
234 | { .str = "(unknown)", .export = export_unknown }, | |
235 | }; | |
236 | ||
237 | ||
238 | static const char *export_str(enum export ex) | |
239 | { | |
240 | return export_list[ex].str; | |
241 | } | |
242 | ||
df578e7d | 243 | static enum export export_no(const char *s) |
bd5cbced RP |
244 | { |
245 | int i; | |
df578e7d | 246 | |
534b89a9 SR |
247 | if (!s) |
248 | return export_unknown; | |
bd5cbced RP |
249 | for (i = 0; export_list[i].export != export_unknown; i++) { |
250 | if (strcmp(export_list[i].str, s) == 0) | |
251 | return export_list[i].export; | |
252 | } | |
253 | return export_unknown; | |
254 | } | |
255 | ||
256 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
257 | { | |
258 | if (sec == elf->export_sec) | |
259 | return export_plain; | |
c96fca21 SR |
260 | else if (sec == elf->export_unused_sec) |
261 | return export_unused; | |
bd5cbced RP |
262 | else if (sec == elf->export_gpl_sec) |
263 | return export_gpl; | |
c96fca21 SR |
264 | else if (sec == elf->export_unused_gpl_sec) |
265 | return export_unused_gpl; | |
bd5cbced RP |
266 | else if (sec == elf->export_gpl_future_sec) |
267 | return export_gpl_future; | |
268 | else | |
269 | return export_unknown; | |
270 | } | |
271 | ||
5c3ead8c SR |
272 | /** |
273 | * Add an exported symbol - it may have already been added without a | |
274 | * CRC, in this case just update the CRC | |
275 | **/ | |
bd5cbced RP |
276 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
277 | enum export export) | |
1da177e4 LT |
278 | { |
279 | struct symbol *s = find_symbol(name); | |
280 | ||
281 | if (!s) { | |
bd5cbced | 282 | s = new_symbol(name, mod, export); |
8e70c458 SR |
283 | } else { |
284 | if (!s->preloaded) { | |
7b75b13c | 285 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
286 | "was in %s%s\n", mod->name, name, |
287 | s->module->name, | |
288 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
289 | } else { |
290 | /* In case Modules.symvers was out of date */ | |
291 | s->module = mod; | |
8e70c458 | 292 | } |
1da177e4 | 293 | } |
8e70c458 | 294 | s->preloaded = 0; |
040fcc81 SR |
295 | s->vmlinux = is_vmlinux(mod->name); |
296 | s->kernel = 0; | |
bd5cbced | 297 | s->export = export; |
040fcc81 SR |
298 | return s; |
299 | } | |
300 | ||
301 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 302 | unsigned int crc, enum export export) |
040fcc81 SR |
303 | { |
304 | struct symbol *s = find_symbol(name); | |
305 | ||
306 | if (!s) | |
bd5cbced | 307 | s = new_symbol(name, mod, export); |
040fcc81 SR |
308 | s->crc = crc; |
309 | s->crc_valid = 1; | |
1da177e4 LT |
310 | } |
311 | ||
5c3ead8c | 312 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
313 | { |
314 | struct stat st; | |
315 | void *map; | |
316 | int fd; | |
317 | ||
318 | fd = open(filename, O_RDONLY); | |
319 | if (fd < 0 || fstat(fd, &st) != 0) | |
320 | return NULL; | |
321 | ||
322 | *size = st.st_size; | |
323 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
324 | close(fd); | |
325 | ||
326 | if (map == MAP_FAILED) | |
327 | return NULL; | |
328 | return map; | |
329 | } | |
330 | ||
5c3ead8c SR |
331 | /** |
332 | * Return a copy of the next line in a mmap'ed file. | |
333 | * spaces in the beginning of the line is trimmed away. | |
334 | * Return a pointer to a static buffer. | |
335 | **/ | |
df578e7d | 336 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
337 | { |
338 | static char line[4096]; | |
339 | int skip = 1; | |
340 | size_t len = 0; | |
341 | signed char *p = (signed char *)file + *pos; | |
342 | char *s = line; | |
343 | ||
df578e7d | 344 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
345 | if (skip && isspace(*p)) { |
346 | p++; | |
347 | continue; | |
348 | } | |
349 | skip = 0; | |
350 | if (*p != '\n' && (*pos < size)) { | |
351 | len++; | |
352 | *s++ = *p++; | |
353 | if (len > 4095) | |
354 | break; /* Too long, stop */ | |
355 | } else { | |
356 | /* End of string */ | |
357 | *s = '\0'; | |
358 | return line; | |
359 | } | |
360 | } | |
361 | /* End of buffer */ | |
362 | return NULL; | |
363 | } | |
364 | ||
5c3ead8c | 365 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
366 | { |
367 | munmap(file, size); | |
368 | } | |
369 | ||
85bd2fdd | 370 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
371 | { |
372 | unsigned int i; | |
85bd2fdd | 373 | Elf_Ehdr *hdr; |
1da177e4 LT |
374 | Elf_Shdr *sechdrs; |
375 | Elf_Sym *sym; | |
376 | ||
377 | hdr = grab_file(filename, &info->size); | |
378 | if (!hdr) { | |
379 | perror(filename); | |
6803dc0e | 380 | exit(1); |
1da177e4 LT |
381 | } |
382 | info->hdr = hdr; | |
85bd2fdd SR |
383 | if (info->size < sizeof(*hdr)) { |
384 | /* file too small, assume this is an empty .o file */ | |
385 | return 0; | |
386 | } | |
387 | /* Is this a valid ELF file? */ | |
388 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
389 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
390 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
391 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
392 | /* Not an ELF file - silently ignore it */ | |
393 | return 0; | |
394 | } | |
1da177e4 | 395 | /* Fix endianness in ELF header */ |
7d875a02 AK |
396 | hdr->e_type = TO_NATIVE(hdr->e_type); |
397 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
398 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
399 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
400 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
401 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
402 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
403 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
404 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
405 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
406 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
407 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
408 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
409 | sechdrs = (void *)hdr + hdr->e_shoff; |
410 | info->sechdrs = sechdrs; | |
411 | ||
a83710e5 PS |
412 | /* Check if file offset is correct */ |
413 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
414 | fatal("section header offset=%lu in file '%s' is bigger than " |
415 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
416 | filename, info->size); | |
a83710e5 PS |
417 | return 0; |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* Fix endianness in section headers */ |
421 | for (i = 0; i < hdr->e_shnum; i++) { | |
7d875a02 AK |
422 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
423 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
424 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
425 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
426 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
427 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
428 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
429 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
430 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
431 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
432 | } |
433 | /* Find symbol table. */ | |
434 | for (i = 1; i < hdr->e_shnum; i++) { | |
435 | const char *secstrings | |
436 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 437 | const char *secname; |
56fc82c5 | 438 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 439 | |
56fc82c5 | 440 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
441 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
442 | "sizeof(*hrd)=%zu\n", filename, | |
443 | (unsigned long)sechdrs[i].sh_offset, | |
444 | sizeof(*hdr)); | |
85bd2fdd SR |
445 | return 0; |
446 | } | |
bd5cbced RP |
447 | secname = secstrings + sechdrs[i].sh_name; |
448 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
449 | if (nobits) |
450 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
451 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
452 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
453 | } else if (strcmp(secname, "__ksymtab") == 0) |
454 | info->export_sec = i; | |
c96fca21 SR |
455 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
456 | info->export_unused_sec = i; | |
bd5cbced RP |
457 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
458 | info->export_gpl_sec = i; | |
c96fca21 SR |
459 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
460 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
461 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
462 | info->export_gpl_future_sec = i; | |
463 | ||
1da177e4 LT |
464 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
465 | continue; | |
466 | ||
467 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 468 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 469 | + sechdrs[i].sh_size; |
62070fa4 | 470 | info->strtab = (void *)hdr + |
1da177e4 LT |
471 | sechdrs[sechdrs[i].sh_link].sh_offset; |
472 | } | |
df578e7d | 473 | if (!info->symtab_start) |
cb80514d | 474 | fatal("%s has no symtab?\n", filename); |
df578e7d | 475 | |
1da177e4 LT |
476 | /* Fix endianness in symbols */ |
477 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
478 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
479 | sym->st_name = TO_NATIVE(sym->st_name); | |
480 | sym->st_value = TO_NATIVE(sym->st_value); | |
481 | sym->st_size = TO_NATIVE(sym->st_size); | |
482 | } | |
85bd2fdd | 483 | return 1; |
1da177e4 LT |
484 | } |
485 | ||
5c3ead8c | 486 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
487 | { |
488 | release_file(info->hdr, info->size); | |
489 | } | |
490 | ||
4d7365d6 SR |
491 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
492 | { | |
493 | /* ignore __this_module, it will be resolved shortly */ | |
494 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
495 | return 1; | |
496 | /* ignore global offset table */ | |
497 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
498 | return 1; | |
499 | if (info->hdr->e_machine == EM_PPC) | |
500 | /* Special register function linked on all modules during final link of .ko */ | |
501 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
502 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
503 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
504 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
505 | return 1; | |
506 | /* Do not ignore this symbol */ | |
507 | return 0; | |
508 | } | |
509 | ||
f7b05e64 LY |
510 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
511 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 512 | |
5c3ead8c SR |
513 | static void handle_modversions(struct module *mod, struct elf_info *info, |
514 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
515 | { |
516 | unsigned int crc; | |
bd5cbced | 517 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
518 | |
519 | switch (sym->st_shndx) { | |
520 | case SHN_COMMON: | |
cb80514d | 521 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
522 | break; |
523 | case SHN_ABS: | |
524 | /* CRC'd symbol */ | |
8d99513c | 525 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 526 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
527 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
528 | export); | |
1da177e4 LT |
529 | } |
530 | break; | |
531 | case SHN_UNDEF: | |
532 | /* undefined symbol */ | |
533 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
534 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
535 | break; | |
4d7365d6 | 536 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 537 | break; |
8d529014 BC |
538 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
539 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
540 | /* add compatibility with older glibc */ | |
541 | #ifndef STT_SPARC_REGISTER | |
542 | #define STT_SPARC_REGISTER STT_REGISTER | |
543 | #endif | |
1da177e4 LT |
544 | if (info->hdr->e_machine == EM_SPARC || |
545 | info->hdr->e_machine == EM_SPARCV9) { | |
546 | /* Ignore register directives. */ | |
8d529014 | 547 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 548 | break; |
62070fa4 SR |
549 | if (symname[0] == '.') { |
550 | char *munged = strdup(symname); | |
551 | munged[0] = '_'; | |
552 | munged[1] = toupper(munged[1]); | |
553 | symname = munged; | |
554 | } | |
1da177e4 LT |
555 | } |
556 | #endif | |
62070fa4 | 557 | |
1da177e4 | 558 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
559 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
560 | mod->unres = | |
561 | alloc_symbol(symname + | |
562 | strlen(MODULE_SYMBOL_PREFIX), | |
563 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
564 | mod->unres); | |
565 | } | |
1da177e4 LT |
566 | break; |
567 | default: | |
568 | /* All exported symbols */ | |
8d99513c | 569 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
570 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
571 | export); | |
1da177e4 LT |
572 | } |
573 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
574 | mod->has_init = 1; | |
575 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
576 | mod->has_cleanup = 1; | |
577 | break; | |
578 | } | |
579 | } | |
580 | ||
5c3ead8c SR |
581 | /** |
582 | * Parse tag=value strings from .modinfo section | |
583 | **/ | |
1da177e4 LT |
584 | static char *next_string(char *string, unsigned long *secsize) |
585 | { | |
586 | /* Skip non-zero chars */ | |
587 | while (string[0]) { | |
588 | string++; | |
589 | if ((*secsize)-- <= 1) | |
590 | return NULL; | |
591 | } | |
592 | ||
593 | /* Skip any zero padding. */ | |
594 | while (!string[0]) { | |
595 | string++; | |
596 | if ((*secsize)-- <= 1) | |
597 | return NULL; | |
598 | } | |
599 | return string; | |
600 | } | |
601 | ||
b817f6fe SR |
602 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
603 | const char *tag, char *info) | |
1da177e4 LT |
604 | { |
605 | char *p; | |
606 | unsigned int taglen = strlen(tag); | |
607 | unsigned long size = modinfo_len; | |
608 | ||
b817f6fe SR |
609 | if (info) { |
610 | size -= info - (char *)modinfo; | |
611 | modinfo = next_string(info, &size); | |
612 | } | |
613 | ||
1da177e4 LT |
614 | for (p = modinfo; p; p = next_string(p, &size)) { |
615 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
616 | return p + taglen + 1; | |
617 | } | |
618 | return NULL; | |
619 | } | |
620 | ||
b817f6fe SR |
621 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
622 | const char *tag) | |
623 | ||
624 | { | |
625 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
626 | } | |
627 | ||
4c8fbca5 SR |
628 | /** |
629 | * Test if string s ends in string sub | |
630 | * return 0 if match | |
631 | **/ | |
632 | static int strrcmp(const char *s, const char *sub) | |
633 | { | |
df578e7d | 634 | int slen, sublen; |
62070fa4 | 635 | |
4c8fbca5 SR |
636 | if (!s || !sub) |
637 | return 1; | |
62070fa4 | 638 | |
4c8fbca5 | 639 | slen = strlen(s); |
df578e7d | 640 | sublen = strlen(sub); |
62070fa4 | 641 | |
4c8fbca5 SR |
642 | if ((slen == 0) || (sublen == 0)) |
643 | return 1; | |
644 | ||
df578e7d SR |
645 | if (sublen > slen) |
646 | return 1; | |
4c8fbca5 | 647 | |
df578e7d | 648 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
649 | } |
650 | ||
ff13f926 SR |
651 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
652 | { | |
58fb0d4f SR |
653 | if (sym) |
654 | return elf->strtab + sym->st_name; | |
655 | else | |
f666751a | 656 | return "(unknown)"; |
ff13f926 SR |
657 | } |
658 | ||
659 | static const char *sec_name(struct elf_info *elf, int shndx) | |
660 | { | |
661 | Elf_Shdr *sechdrs = elf->sechdrs; | |
662 | return (void *)elf->hdr + | |
663 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
664 | sechdrs[shndx].sh_name; | |
665 | } | |
666 | ||
667 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
668 | { | |
669 | return (void *)elf->hdr + | |
670 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
671 | sechdr->sh_name; | |
672 | } | |
673 | ||
10668220 SR |
674 | /* if sym is empty or point to a string |
675 | * like ".[0-9]+" then return 1. | |
676 | * This is the optional prefix added by ld to some sections | |
677 | */ | |
678 | static int number_prefix(const char *sym) | |
679 | { | |
680 | if (*sym++ == '\0') | |
681 | return 1; | |
682 | if (*sym != '.') | |
683 | return 0; | |
684 | do { | |
685 | char c = *sym++; | |
686 | if (c < '0' || c > '9') | |
687 | return 0; | |
688 | } while (*sym); | |
689 | return 1; | |
690 | } | |
691 | ||
692 | /* The pattern is an array of simple patterns. | |
693 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 694 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
695 | * "foo*" will match a string that begins with "foo" |
696 | * "foo$" will match a string equal to "foo" or "foo.1" | |
697 | * where the '1' can be any number including several digits. | |
698 | * The $ syntax is for sections where ld append a dot number | |
699 | * to make section name unique. | |
700 | */ | |
5c725138 | 701 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
702 | { |
703 | const char *p; | |
704 | while (*pat) { | |
705 | p = *pat++; | |
706 | const char *endp = p + strlen(p) - 1; | |
707 | ||
6c5bd235 SR |
708 | /* "*foo" */ |
709 | if (*p == '*') { | |
710 | if (strrcmp(sym, p + 1) == 0) | |
711 | return 1; | |
712 | } | |
10668220 | 713 | /* "foo*" */ |
6c5bd235 | 714 | else if (*endp == '*') { |
10668220 SR |
715 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
716 | return 1; | |
717 | } | |
718 | /* "foo$" */ | |
719 | else if (*endp == '$') { | |
720 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
721 | if (number_prefix(sym + strlen(p) - 1)) | |
722 | return 1; | |
723 | } | |
724 | } | |
725 | /* no wildcards */ | |
726 | else { | |
727 | if (strcmp(p, sym) == 0) | |
728 | return 1; | |
729 | } | |
730 | } | |
731 | /* no match */ | |
732 | return 0; | |
733 | } | |
734 | ||
10668220 SR |
735 | /* sections that we do not want to do full section mismatch check on */ |
736 | static const char *section_white_list[] = | |
4391ed6a SR |
737 | { |
738 | ".comment*", | |
739 | ".debug*", | |
740 | ".mdebug*", /* alpha, score, mips etc. */ | |
741 | ".pdr", /* alpha, score, mips etc. */ | |
742 | ".stab*", | |
743 | ".note*", | |
744 | ".got*", | |
745 | ".toc*", | |
746 | NULL | |
747 | }; | |
10668220 | 748 | |
e241a630 | 749 | /* |
b614a697 | 750 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 751 | * The cause of this is often a section specified in assembler |
b614a697 | 752 | * without "ax" / "aw". |
e241a630 | 753 | */ |
b614a697 AK |
754 | static void check_section(const char *modname, struct elf_info *elf, |
755 | Elf_Shdr *sechdr) | |
e241a630 | 756 | { |
b614a697 AK |
757 | const char *sec = sech_name(elf, sechdr); |
758 | ||
759 | if (sechdr->sh_type == SHT_PROGBITS && | |
760 | !(sechdr->sh_flags & SHF_ALLOC) && | |
761 | !match(sec, section_white_list)) { | |
762 | warn("%s (%s): unexpected non-allocatable section.\n" | |
763 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
764 | "Note that for example <linux/init.h> contains\n" | |
765 | "section definitions for use in .S files.\n\n", | |
766 | modname, sec); | |
e241a630 | 767 | } |
e241a630 SR |
768 | } |
769 | ||
770 | ||
771 | ||
eb8f6890 | 772 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d JB |
773 | ".init.setup$", ".init.rodata$", \ |
774 | ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ | |
eb8f6890 SR |
775 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" |
776 | #define ALL_EXIT_DATA_SECTIONS \ | |
777 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 778 | |
eb8f6890 SR |
779 | #define ALL_INIT_TEXT_SECTIONS \ |
780 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
781 | #define ALL_EXIT_TEXT_SECTIONS \ | |
782 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 783 | |
fd6c3a8d JB |
784 | #define ALL_INIT_SECTIONS INIT_SECTIONS, DEV_INIT_SECTIONS, \ |
785 | CPU_INIT_SECTIONS, MEM_INIT_SECTIONS | |
786 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, DEV_EXIT_SECTIONS, \ | |
787 | CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS | |
10668220 | 788 | |
6c5bd235 | 789 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
790 | #define TEXT_SECTIONS ".text$" |
791 | ||
fd6c3a8d JB |
792 | #define INIT_SECTIONS ".init.*" |
793 | #define DEV_INIT_SECTIONS ".devinit.*" | |
794 | #define CPU_INIT_SECTIONS ".cpuinit.*" | |
795 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 796 | |
fd6c3a8d JB |
797 | #define EXIT_SECTIONS ".exit.*" |
798 | #define DEV_EXIT_SECTIONS ".devexit.*" | |
799 | #define CPU_EXIT_SECTIONS ".cpuexit.*" | |
800 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 801 | |
6c5bd235 | 802 | /* init data sections */ |
eb8f6890 | 803 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
804 | |
805 | /* all init sections */ | |
eb8f6890 | 806 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
807 | |
808 | /* All init and exit sections (code + data) */ | |
809 | static const char *init_exit_sections[] = | |
eb8f6890 | 810 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
811 | |
812 | /* data section */ | |
813 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
814 | ||
6c5bd235 SR |
815 | |
816 | /* symbols in .data that may refer to init/exit sections */ | |
817 | static const char *symbol_white_list[] = | |
818 | { | |
819 | "*driver", | |
820 | "*_template", /* scsi uses *_template a lot */ | |
821 | "*_timer", /* arm uses ops structures named _timer a lot */ | |
822 | "*_sht", /* scsi also used *_sht to some extent */ | |
823 | "*_ops", | |
824 | "*_probe", | |
825 | "*_probe_one", | |
826 | "*_console", | |
827 | NULL | |
828 | }; | |
829 | ||
830 | static const char *head_sections[] = { ".head.text*", NULL }; | |
831 | static const char *linker_symbols[] = | |
832 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
833 | ||
588ccd73 SR |
834 | enum mismatch { |
835 | NO_MISMATCH, | |
836 | TEXT_TO_INIT, | |
837 | DATA_TO_INIT, | |
838 | TEXT_TO_EXIT, | |
839 | DATA_TO_EXIT, | |
840 | XXXINIT_TO_INIT, | |
841 | XXXEXIT_TO_EXIT, | |
842 | INIT_TO_EXIT, | |
843 | EXIT_TO_INIT, | |
844 | EXPORT_TO_INIT_EXIT, | |
845 | }; | |
846 | ||
10668220 SR |
847 | struct sectioncheck { |
848 | const char *fromsec[20]; | |
849 | const char *tosec[20]; | |
588ccd73 | 850 | enum mismatch mismatch; |
10668220 SR |
851 | }; |
852 | ||
853 | const struct sectioncheck sectioncheck[] = { | |
854 | /* Do not reference init/exit code/data from | |
855 | * normal code and data | |
856 | */ | |
857 | { | |
588ccd73 SR |
858 | .fromsec = { TEXT_SECTIONS, NULL }, |
859 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
860 | .mismatch = TEXT_TO_INIT, | |
861 | }, | |
862 | { | |
863 | .fromsec = { DATA_SECTIONS, NULL }, | |
864 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
865 | .mismatch = DATA_TO_INIT, | |
866 | }, | |
867 | { | |
868 | .fromsec = { TEXT_SECTIONS, NULL }, | |
869 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
870 | .mismatch = TEXT_TO_EXIT, | |
871 | }, | |
872 | { | |
873 | .fromsec = { DATA_SECTIONS, NULL }, | |
874 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
875 | .mismatch = DATA_TO_EXIT, | |
eb8f6890 SR |
876 | }, |
877 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
878 | { | |
879 | .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL }, | |
588ccd73 SR |
880 | .tosec = { INIT_SECTIONS, NULL }, |
881 | .mismatch = XXXINIT_TO_INIT, | |
eb8f6890 | 882 | }, |
fd6c3a8d JB |
883 | /* Do not reference cpuinit code/data from meminit code/data */ |
884 | { | |
885 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
886 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
887 | .mismatch = XXXINIT_TO_INIT, | |
888 | }, | |
889 | /* Do not reference meminit code/data from cpuinit code/data */ | |
890 | { | |
891 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
892 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
893 | .mismatch = XXXINIT_TO_INIT, | |
894 | }, | |
eb8f6890 SR |
895 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ |
896 | { | |
897 | .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL }, | |
588ccd73 SR |
898 | .tosec = { EXIT_SECTIONS, NULL }, |
899 | .mismatch = XXXEXIT_TO_EXIT, | |
10668220 | 900 | }, |
fd6c3a8d JB |
901 | /* Do not reference cpuexit code/data from memexit code/data */ |
902 | { | |
903 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
904 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
905 | .mismatch = XXXEXIT_TO_EXIT, | |
906 | }, | |
907 | /* Do not reference memexit code/data from cpuexit code/data */ | |
908 | { | |
909 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
910 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
911 | .mismatch = XXXEXIT_TO_EXIT, | |
912 | }, | |
10668220 SR |
913 | /* Do not use exit code/data from init code */ |
914 | { | |
eb8f6890 SR |
915 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
916 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
588ccd73 | 917 | .mismatch = INIT_TO_EXIT, |
10668220 SR |
918 | }, |
919 | /* Do not use init code/data from exit code */ | |
920 | { | |
eb8f6890 | 921 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 SR |
922 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
923 | .mismatch = EXIT_TO_INIT, | |
10668220 SR |
924 | }, |
925 | /* Do not export init/exit functions or data */ | |
926 | { | |
927 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 928 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
588ccd73 | 929 | .mismatch = EXPORT_TO_INIT_EXIT |
10668220 SR |
930 | } |
931 | }; | |
932 | ||
933 | static int section_mismatch(const char *fromsec, const char *tosec) | |
934 | { | |
935 | int i; | |
936 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
937 | const struct sectioncheck *check = §ioncheck[0]; | |
938 | ||
939 | for (i = 0; i < elems; i++) { | |
940 | if (match(fromsec, check->fromsec) && | |
941 | match(tosec, check->tosec)) | |
588ccd73 | 942 | return check->mismatch; |
10668220 SR |
943 | check++; |
944 | } | |
588ccd73 | 945 | return NO_MISMATCH; |
10668220 SR |
946 | } |
947 | ||
4c8fbca5 SR |
948 | /** |
949 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 950 | * |
4c8fbca5 SR |
951 | * Pattern 1: |
952 | * If a module parameter is declared __initdata and permissions=0 | |
953 | * then this is legal despite the warning generated. | |
954 | * We cannot see value of permissions here, so just ignore | |
955 | * this pattern. | |
956 | * The pattern is identified by: | |
957 | * tosec = .init.data | |
9209aed0 | 958 | * fromsec = .data* |
4c8fbca5 | 959 | * atsym =__param* |
62070fa4 | 960 | * |
4c8fbca5 | 961 | * Pattern 2: |
72ee59b5 | 962 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
963 | * add, remove, probe functions etc. |
964 | * These functions may often be marked __init and we do not want to | |
965 | * warn here. | |
966 | * the pattern is identified by: | |
83cda2bb SR |
967 | * tosec = init or exit section |
968 | * fromsec = data section | |
df578e7d SR |
969 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
970 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
971 | * |
972 | * Pattern 3: | |
c993971f | 973 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 974 | * |
1d8af559 | 975 | * Pattern 4: |
ee6a8545 VG |
976 | * Some symbols belong to init section but still it is ok to reference |
977 | * these from non-init sections as these symbols don't have any memory | |
978 | * allocated for them and symbol address and value are same. So even | |
979 | * if init section is freed, its ok to reference those symbols. | |
980 | * For ex. symbols marking the init section boundaries. | |
981 | * This pattern is identified by | |
982 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 983 | * |
4c8fbca5 | 984 | **/ |
58fb0d4f SR |
985 | static int secref_whitelist(const char *fromsec, const char *fromsym, |
986 | const char *tosec, const char *tosym) | |
4c8fbca5 | 987 | { |
4c8fbca5 | 988 | /* Check for pattern 1 */ |
6c5bd235 SR |
989 | if (match(tosec, init_data_sections) && |
990 | match(fromsec, data_sections) && | |
58fb0d4f SR |
991 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
992 | return 0; | |
4c8fbca5 SR |
993 | |
994 | /* Check for pattern 2 */ | |
6c5bd235 SR |
995 | if (match(tosec, init_exit_sections) && |
996 | match(fromsec, data_sections) && | |
58fb0d4f SR |
997 | match(fromsym, symbol_white_list)) |
998 | return 0; | |
4c8fbca5 | 999 | |
9bf8cb9b | 1000 | /* Check for pattern 3 */ |
6c5bd235 SR |
1001 | if (match(fromsec, head_sections) && |
1002 | match(tosec, init_sections)) | |
58fb0d4f | 1003 | return 0; |
9bf8cb9b | 1004 | |
1d8af559 | 1005 | /* Check for pattern 4 */ |
58fb0d4f SR |
1006 | if (match(tosym, linker_symbols)) |
1007 | return 0; | |
9bf8cb9b | 1008 | |
58fb0d4f | 1009 | return 1; |
4c8fbca5 SR |
1010 | } |
1011 | ||
93684d3b SR |
1012 | /** |
1013 | * Find symbol based on relocation record info. | |
1014 | * In some cases the symbol supplied is a valid symbol so | |
1015 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1016 | * In other cases the symbol needs to be looked up in the symbol table | |
1017 | * based on section and address. | |
1018 | * **/ | |
9ad21c3f | 1019 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1020 | Elf_Sym *relsym) |
1021 | { | |
1022 | Elf_Sym *sym; | |
9ad21c3f SR |
1023 | Elf_Sym *near = NULL; |
1024 | Elf64_Sword distance = 20; | |
1025 | Elf64_Sword d; | |
93684d3b SR |
1026 | |
1027 | if (relsym->st_name != 0) | |
1028 | return relsym; | |
1029 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
1030 | if (sym->st_shndx != relsym->st_shndx) | |
1031 | continue; | |
ae4ac123 AN |
1032 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1033 | continue; | |
93684d3b SR |
1034 | if (sym->st_value == addr) |
1035 | return sym; | |
9ad21c3f SR |
1036 | /* Find a symbol nearby - addr are maybe negative */ |
1037 | d = sym->st_value - addr; | |
1038 | if (d < 0) | |
1039 | d = addr - sym->st_value; | |
1040 | if (d < distance) { | |
1041 | distance = d; | |
1042 | near = sym; | |
1043 | } | |
93684d3b | 1044 | } |
9ad21c3f SR |
1045 | /* We need a close match */ |
1046 | if (distance < 20) | |
1047 | return near; | |
1048 | else | |
1049 | return NULL; | |
93684d3b SR |
1050 | } |
1051 | ||
da68d61f DB |
1052 | static inline int is_arm_mapping_symbol(const char *str) |
1053 | { | |
1054 | return str[0] == '$' && strchr("atd", str[1]) | |
1055 | && (str[2] == '\0' || str[2] == '.'); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1060 | * one of the magic symbols emitted used by current ARM tools. | |
1061 | * | |
1062 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1063 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1064 | * only by merging __exit and __init sections into __text, bloating | |
1065 | * the kernel (which is especially evil on embedded platforms). | |
1066 | */ | |
1067 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1068 | { | |
1069 | const char *name = elf->strtab + sym->st_name; | |
1070 | ||
1071 | if (!name || !strlen(name)) | |
1072 | return 0; | |
1073 | return !is_arm_mapping_symbol(name); | |
1074 | } | |
1075 | ||
b39927cf | 1076 | /* |
43c74d17 SR |
1077 | * Find symbols before or equal addr and after addr - in the section sec. |
1078 | * If we find two symbols with equal offset prefer one with a valid name. | |
1079 | * The ELF format may have a better way to detect what type of symbol | |
1080 | * it is, but this works for now. | |
b39927cf | 1081 | **/ |
157c23c8 SR |
1082 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1083 | const char *sec) | |
b39927cf SR |
1084 | { |
1085 | Elf_Sym *sym; | |
157c23c8 | 1086 | Elf_Sym *near = NULL; |
157c23c8 | 1087 | Elf_Addr distance = ~0; |
62070fa4 | 1088 | |
b39927cf SR |
1089 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1090 | const char *symsec; | |
1091 | ||
1092 | if (sym->st_shndx >= SHN_LORESERVE) | |
1093 | continue; | |
ff13f926 | 1094 | symsec = sec_name(elf, sym->st_shndx); |
b39927cf SR |
1095 | if (strcmp(symsec, sec) != 0) |
1096 | continue; | |
da68d61f DB |
1097 | if (!is_valid_name(elf, sym)) |
1098 | continue; | |
b39927cf | 1099 | if (sym->st_value <= addr) { |
157c23c8 SR |
1100 | if ((addr - sym->st_value) < distance) { |
1101 | distance = addr - sym->st_value; | |
1102 | near = sym; | |
1103 | } else if ((addr - sym->st_value) == distance) { | |
1104 | near = sym; | |
43c74d17 | 1105 | } |
b39927cf SR |
1106 | } |
1107 | } | |
157c23c8 | 1108 | return near; |
b39927cf SR |
1109 | } |
1110 | ||
588ccd73 SR |
1111 | /* |
1112 | * Convert a section name to the function/data attribute | |
1113 | * .init.text => __init | |
1114 | * .cpuinit.data => __cpudata | |
1115 | * .memexitconst => __memconst | |
1116 | * etc. | |
1117 | */ | |
1118 | static char *sec2annotation(const char *s) | |
1119 | { | |
1120 | if (match(s, init_exit_sections)) { | |
1121 | char *p = malloc(20); | |
1122 | char *r = p; | |
1123 | ||
1124 | *p++ = '_'; | |
1125 | *p++ = '_'; | |
1126 | if (*s == '.') | |
1127 | s++; | |
1128 | while (*s && *s != '.') | |
1129 | *p++ = *s++; | |
1130 | *p = '\0'; | |
1131 | if (*s == '.') | |
1132 | s++; | |
1133 | if (strstr(s, "rodata") != NULL) | |
1134 | strcat(p, "const "); | |
1135 | else if (strstr(s, "data") != NULL) | |
1136 | strcat(p, "data "); | |
1137 | else | |
1138 | strcat(p, " "); | |
1139 | return r; /* we leak her but we do not care */ | |
1140 | } else { | |
1141 | return ""; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | static int is_function(Elf_Sym *sym) | |
1146 | { | |
1147 | if (sym) | |
1148 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1149 | else | |
f666751a | 1150 | return -1; |
588ccd73 SR |
1151 | } |
1152 | ||
58fb0d4f | 1153 | /* |
b39927cf SR |
1154 | * Print a warning about a section mismatch. |
1155 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1156 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1157 | */ |
588ccd73 | 1158 | static void report_sec_mismatch(const char *modname, enum mismatch mismatch, |
58fb0d4f SR |
1159 | const char *fromsec, |
1160 | unsigned long long fromaddr, | |
1161 | const char *fromsym, | |
588ccd73 SR |
1162 | int from_is_func, |
1163 | const char *tosec, const char *tosym, | |
1164 | int to_is_func) | |
1165 | { | |
1166 | const char *from, *from_p; | |
1167 | const char *to, *to_p; | |
f666751a SR |
1168 | |
1169 | switch (from_is_func) { | |
1170 | case 0: from = "variable"; from_p = ""; break; | |
1171 | case 1: from = "function"; from_p = "()"; break; | |
1172 | default: from = "(unknown reference)"; from_p = ""; break; | |
1173 | } | |
1174 | switch (to_is_func) { | |
1175 | case 0: to = "variable"; to_p = ""; break; | |
1176 | case 1: to = "function"; to_p = "()"; break; | |
1177 | default: to = "(unknown reference)"; to_p = ""; break; | |
1178 | } | |
588ccd73 | 1179 | |
e5f95c8b SR |
1180 | sec_mismatch_count++; |
1181 | if (!sec_mismatch_verbose) | |
1182 | return; | |
1183 | ||
7c0ac495 GU |
1184 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1185 | "to the %s %s:%s%s\n", | |
1186 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1187 | tosym, to_p); | |
588ccd73 | 1188 | |
588ccd73 SR |
1189 | switch (mismatch) { |
1190 | case TEXT_TO_INIT: | |
1191 | fprintf(stderr, | |
f666751a | 1192 | "The function %s%s() references\n" |
588ccd73 SR |
1193 | "the %s %s%s%s.\n" |
1194 | "This is often because %s lacks a %s\n" | |
1195 | "annotation or the annotation of %s is wrong.\n", | |
1196 | sec2annotation(fromsec), fromsym, | |
1197 | to, sec2annotation(tosec), tosym, to_p, | |
1198 | fromsym, sec2annotation(tosec), tosym); | |
1199 | break; | |
1200 | case DATA_TO_INIT: { | |
1201 | const char **s = symbol_white_list; | |
1202 | fprintf(stderr, | |
1203 | "The variable %s references\n" | |
1204 | "the %s %s%s%s\n" | |
1205 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1206 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 SR |
1207 | "or name the variable:\n", |
1208 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1209 | while (*s) | |
1210 | fprintf(stderr, "%s, ", *s++); | |
1211 | fprintf(stderr, "\n"); | |
1212 | break; | |
58fb0d4f | 1213 | } |
588ccd73 SR |
1214 | case TEXT_TO_EXIT: |
1215 | fprintf(stderr, | |
1216 | "The function %s() references a %s in an exit section.\n" | |
1217 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1218 | "and the fix is to remove the %sannotation of %s.\n", | |
1219 | fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym); | |
1220 | break; | |
1221 | case DATA_TO_EXIT: { | |
1222 | const char **s = symbol_white_list; | |
1223 | fprintf(stderr, | |
1224 | "The variable %s references\n" | |
1225 | "the %s %s%s%s\n" | |
1226 | "If the reference is valid then annotate the\n" | |
1227 | "variable with __exit* (see linux/init.h) or " | |
1228 | "name the variable:\n", | |
1229 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1230 | while (*s) | |
1231 | fprintf(stderr, "%s, ", *s++); | |
1232 | fprintf(stderr, "\n"); | |
1233 | break; | |
1234 | } | |
1235 | case XXXINIT_TO_INIT: | |
1236 | case XXXEXIT_TO_EXIT: | |
1237 | fprintf(stderr, | |
1238 | "The %s %s%s%s references\n" | |
1239 | "a %s %s%s%s.\n" | |
1240 | "If %s is only used by %s then\n" | |
1241 | "annotate %s with a matching annotation.\n", | |
1242 | from, sec2annotation(fromsec), fromsym, from_p, | |
1243 | to, sec2annotation(tosec), tosym, to_p, | |
b1d2675a | 1244 | tosym, fromsym, tosym); |
588ccd73 SR |
1245 | break; |
1246 | case INIT_TO_EXIT: | |
1247 | fprintf(stderr, | |
1248 | "The %s %s%s%s references\n" | |
1249 | "a %s %s%s%s.\n" | |
1250 | "This is often seen when error handling " | |
1251 | "in the init function\n" | |
1252 | "uses functionality in the exit path.\n" | |
1253 | "The fix is often to remove the %sannotation of\n" | |
1254 | "%s%s so it may be used outside an exit section.\n", | |
1255 | from, sec2annotation(fromsec), fromsym, from_p, | |
1256 | to, sec2annotation(tosec), tosym, to_p, | |
1257 | sec2annotation(tosec), tosym, to_p); | |
1258 | break; | |
1259 | case EXIT_TO_INIT: | |
1260 | fprintf(stderr, | |
1261 | "The %s %s%s%s references\n" | |
1262 | "a %s %s%s%s.\n" | |
1263 | "This is often seen when error handling " | |
1264 | "in the exit function\n" | |
1265 | "uses functionality in the init path.\n" | |
1266 | "The fix is often to remove the %sannotation of\n" | |
1267 | "%s%s so it may be used outside an init section.\n", | |
1268 | from, sec2annotation(fromsec), fromsym, from_p, | |
1269 | to, sec2annotation(tosec), tosym, to_p, | |
1270 | sec2annotation(tosec), tosym, to_p); | |
1271 | break; | |
1272 | case EXPORT_TO_INIT_EXIT: | |
1273 | fprintf(stderr, | |
1274 | "The symbol %s is exported and annotated %s\n" | |
1275 | "Fix this by removing the %sannotation of %s " | |
1276 | "or drop the export.\n", | |
1277 | tosym, sec2annotation(tosec), sec2annotation(tosec), tosym); | |
1278 | case NO_MISMATCH: | |
1279 | /* To get warnings on missing members */ | |
1280 | break; | |
1281 | } | |
1282 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1283 | } |
1284 | ||
1285 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1286 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1287 | { | |
1288 | const char *tosec; | |
588ccd73 | 1289 | enum mismatch mismatch; |
58fb0d4f SR |
1290 | |
1291 | tosec = sec_name(elf, sym->st_shndx); | |
588ccd73 SR |
1292 | mismatch = section_mismatch(fromsec, tosec); |
1293 | if (mismatch != NO_MISMATCH) { | |
1294 | Elf_Sym *to; | |
1295 | Elf_Sym *from; | |
58fb0d4f | 1296 | const char *tosym; |
588ccd73 | 1297 | const char *fromsym; |
58fb0d4f | 1298 | |
588ccd73 SR |
1299 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1300 | fromsym = sym_name(elf, from); | |
1301 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1302 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1303 | |
1304 | /* check whitelist - we may ignore it */ | |
1305 | if (secref_whitelist(fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1306 | report_sec_mismatch(modname, mismatch, |
1307 | fromsec, r->r_offset, fromsym, | |
1308 | is_function(from), tosec, tosym, | |
1309 | is_function(to)); | |
58fb0d4f | 1310 | } |
b39927cf SR |
1311 | } |
1312 | } | |
1313 | ||
ae4ac123 | 1314 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1315 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1316 | { |
1317 | Elf_Shdr *sechdrs = elf->sechdrs; | |
5b24c071 | 1318 | int section = sechdr->sh_info; |
ae4ac123 AN |
1319 | |
1320 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
1321 | (r->r_offset - sechdrs[section].sh_addr); | |
1322 | } | |
1323 | ||
5b24c071 | 1324 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1325 | { |
1326 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1327 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1328 | |
1329 | switch (r_typ) { | |
1330 | case R_386_32: | |
1331 | r->r_addend = TO_NATIVE(*location); | |
1332 | break; | |
1333 | case R_386_PC32: | |
1334 | r->r_addend = TO_NATIVE(*location) + 4; | |
1335 | /* For CONFIG_RELOCATABLE=y */ | |
1336 | if (elf->hdr->e_type == ET_EXEC) | |
1337 | r->r_addend += r->r_offset; | |
1338 | break; | |
1339 | } | |
1340 | return 0; | |
1341 | } | |
1342 | ||
5b24c071 | 1343 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1344 | { |
1345 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1346 | ||
1347 | switch (r_typ) { | |
1348 | case R_ARM_ABS32: | |
1349 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1350 | r->r_addend = (int)(long) |
1351 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1352 | break; |
1353 | case R_ARM_PC24: | |
1354 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1355 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1356 | sechdr->sh_offset + |
1357 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1358 | break; |
1359 | default: | |
1360 | return 1; | |
1361 | } | |
1362 | return 0; | |
1363 | } | |
1364 | ||
5b24c071 | 1365 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1366 | { |
1367 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1368 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1369 | unsigned int inst; |
1370 | ||
1371 | if (r_typ == R_MIPS_HI16) | |
1372 | return 1; /* skip this */ | |
1373 | inst = TO_NATIVE(*location); | |
1374 | switch (r_typ) { | |
1375 | case R_MIPS_LO16: | |
1376 | r->r_addend = inst & 0xffff; | |
1377 | break; | |
1378 | case R_MIPS_26: | |
1379 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1380 | break; | |
1381 | case R_MIPS_32: | |
1382 | r->r_addend = inst; | |
1383 | break; | |
1384 | } | |
1385 | return 0; | |
1386 | } | |
1387 | ||
5b24c071 | 1388 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1389 | Elf_Shdr *sechdr) |
5b24c071 SR |
1390 | { |
1391 | Elf_Sym *sym; | |
1392 | Elf_Rela *rela; | |
1393 | Elf_Rela r; | |
1394 | unsigned int r_sym; | |
1395 | const char *fromsec; | |
5b24c071 | 1396 | |
ff13f926 | 1397 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1398 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1399 | ||
ff13f926 | 1400 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1401 | fromsec += strlen(".rela"); |
1402 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1403 | if (match(fromsec, section_white_list)) |
5b24c071 | 1404 | return; |
e241a630 | 1405 | |
5b24c071 SR |
1406 | for (rela = start; rela < stop; rela++) { |
1407 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1408 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1409 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1410 | unsigned int r_typ; |
1411 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1412 | r_sym = TO_NATIVE(r_sym); | |
1413 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1414 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1415 | } else { | |
1416 | r.r_info = TO_NATIVE(rela->r_info); | |
1417 | r_sym = ELF_R_SYM(r.r_info); | |
1418 | } | |
1419 | #else | |
1420 | r.r_info = TO_NATIVE(rela->r_info); | |
1421 | r_sym = ELF_R_SYM(r.r_info); | |
1422 | #endif | |
1423 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1424 | sym = elf->symtab_start + r_sym; | |
1425 | /* Skip special sections */ | |
1426 | if (sym->st_shndx >= SHN_LORESERVE) | |
1427 | continue; | |
58fb0d4f | 1428 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1429 | } |
1430 | } | |
1431 | ||
1432 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1433 | Elf_Shdr *sechdr) |
5b24c071 SR |
1434 | { |
1435 | Elf_Sym *sym; | |
1436 | Elf_Rel *rel; | |
1437 | Elf_Rela r; | |
1438 | unsigned int r_sym; | |
1439 | const char *fromsec; | |
5b24c071 | 1440 | |
ff13f926 | 1441 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1442 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1443 | ||
ff13f926 | 1444 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1445 | fromsec += strlen(".rel"); |
1446 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1447 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1448 | return; |
1449 | ||
1450 | for (rel = start; rel < stop; rel++) { | |
1451 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1452 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1453 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1454 | unsigned int r_typ; |
1455 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1456 | r_sym = TO_NATIVE(r_sym); | |
1457 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1458 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1459 | } else { | |
1460 | r.r_info = TO_NATIVE(rel->r_info); | |
1461 | r_sym = ELF_R_SYM(r.r_info); | |
1462 | } | |
1463 | #else | |
1464 | r.r_info = TO_NATIVE(rel->r_info); | |
1465 | r_sym = ELF_R_SYM(r.r_info); | |
1466 | #endif | |
1467 | r.r_addend = 0; | |
ff13f926 | 1468 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1469 | case EM_386: |
1470 | if (addend_386_rel(elf, sechdr, &r)) | |
1471 | continue; | |
1472 | break; | |
1473 | case EM_ARM: | |
1474 | if (addend_arm_rel(elf, sechdr, &r)) | |
1475 | continue; | |
1476 | break; | |
1477 | case EM_MIPS: | |
1478 | if (addend_mips_rel(elf, sechdr, &r)) | |
1479 | continue; | |
1480 | break; | |
1481 | } | |
1482 | sym = elf->symtab_start + r_sym; | |
1483 | /* Skip special sections */ | |
1484 | if (sym->st_shndx >= SHN_LORESERVE) | |
1485 | continue; | |
58fb0d4f | 1486 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1487 | } |
1488 | } | |
1489 | ||
b39927cf SR |
1490 | /** |
1491 | * A module includes a number of sections that are discarded | |
1492 | * either when loaded or when used as built-in. | |
1493 | * For loaded modules all functions marked __init and all data | |
1494 | * marked __initdata will be discarded when the module has been intialized. | |
1495 | * Likewise for modules used built-in the sections marked __exit | |
1496 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1497 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1498 | * The check_sec_ref() function traverses all relocation records |
1499 | * to find all references to a section that reference a section that will | |
1500 | * be discarded and warns about it. | |
1501 | **/ | |
1502 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1503 | struct elf_info *elf) |
b39927cf SR |
1504 | { |
1505 | int i; | |
b39927cf | 1506 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1507 | |
b39927cf | 1508 | /* Walk through all sections */ |
ff13f926 | 1509 | for (i = 0; i < elf->hdr->e_shnum; i++) { |
b614a697 | 1510 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1511 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1512 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1513 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1514 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1515 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1516 | } |
1517 | } | |
1518 | ||
5c3ead8c | 1519 | static void read_symbols(char *modname) |
1da177e4 LT |
1520 | { |
1521 | const char *symname; | |
1522 | char *version; | |
b817f6fe | 1523 | char *license; |
1da177e4 LT |
1524 | struct module *mod; |
1525 | struct elf_info info = { }; | |
1526 | Elf_Sym *sym; | |
1527 | ||
85bd2fdd SR |
1528 | if (!parse_elf(&info, modname)) |
1529 | return; | |
1da177e4 LT |
1530 | |
1531 | mod = new_module(modname); | |
1532 | ||
1533 | /* When there's no vmlinux, don't print warnings about | |
1534 | * unresolved symbols (since there'll be too many ;) */ | |
1535 | if (is_vmlinux(modname)) { | |
1da177e4 | 1536 | have_vmlinux = 1; |
1da177e4 LT |
1537 | mod->skip = 1; |
1538 | } | |
1539 | ||
b817f6fe | 1540 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1541 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1542 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1543 | "see include/linux/module.h for " | |
1544 | "more information\n", modname); | |
b817f6fe SR |
1545 | while (license) { |
1546 | if (license_is_gpl_compatible(license)) | |
1547 | mod->gpl_compatible = 1; | |
1548 | else { | |
1549 | mod->gpl_compatible = 0; | |
1550 | break; | |
1551 | } | |
1552 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1553 | "license", license); | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1557 | symname = info.strtab + sym->st_name; | |
1558 | ||
1559 | handle_modversions(mod, &info, sym, symname); | |
1560 | handle_moddevtable(mod, &info, sym, symname); | |
1561 | } | |
d1f25e66 | 1562 | if (!is_vmlinux(modname) || |
10668220 SR |
1563 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1564 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1565 | |
1566 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1567 | if (version) | |
1568 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1569 | version - (char *)info.hdr); | |
1570 | if (version || (all_versions && !is_vmlinux(modname))) | |
1571 | get_src_version(modname, mod->srcversion, | |
1572 | sizeof(mod->srcversion)-1); | |
1573 | ||
1574 | parse_elf_finish(&info); | |
1575 | ||
8c8ef42a | 1576 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1577 | * never passed as an argument to an exported function, so |
1578 | * the automatic versioning doesn't pick it up, but it's really | |
1579 | * important anyhow */ | |
1580 | if (modversions) | |
8c8ef42a | 1581 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1582 | } |
1583 | ||
1584 | #define SZ 500 | |
1585 | ||
1586 | /* We first write the generated file into memory using the | |
1587 | * following helper, then compare to the file on disk and | |
1588 | * only update the later if anything changed */ | |
1589 | ||
5c3ead8c SR |
1590 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1591 | const char *fmt, ...) | |
1da177e4 LT |
1592 | { |
1593 | char tmp[SZ]; | |
1594 | int len; | |
1595 | va_list ap; | |
62070fa4 | 1596 | |
1da177e4 LT |
1597 | va_start(ap, fmt); |
1598 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1599 | buf_write(buf, tmp, len); |
1da177e4 LT |
1600 | va_end(ap); |
1601 | } | |
1602 | ||
5c3ead8c | 1603 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1604 | { |
1605 | if (buf->size - buf->pos < len) { | |
7670f023 | 1606 | buf->size += len + SZ; |
1da177e4 LT |
1607 | buf->p = realloc(buf->p, buf->size); |
1608 | } | |
1609 | strncpy(buf->p + buf->pos, s, len); | |
1610 | buf->pos += len; | |
1611 | } | |
1612 | ||
c96fca21 SR |
1613 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1614 | { | |
1615 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1616 | ||
1617 | switch (exp) { | |
1618 | case export_gpl: | |
1619 | fatal("modpost: GPL-incompatible module %s%s " | |
1620 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1621 | break; | |
1622 | case export_unused_gpl: | |
1623 | fatal("modpost: GPL-incompatible module %s%s " | |
1624 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1625 | break; | |
1626 | case export_gpl_future: | |
1627 | warn("modpost: GPL-incompatible module %s%s " | |
1628 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1629 | break; | |
1630 | case export_plain: | |
1631 | case export_unused: | |
1632 | case export_unknown: | |
1633 | /* ignore */ | |
1634 | break; | |
1635 | } | |
1636 | } | |
1637 | ||
df578e7d | 1638 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1639 | { |
1640 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1641 | ||
1642 | switch (exp) { | |
1643 | case export_unused: | |
1644 | case export_unused_gpl: | |
1645 | warn("modpost: module %s%s " | |
1646 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1647 | break; | |
1648 | default: | |
1649 | /* ignore */ | |
1650 | break; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1655 | { |
1656 | struct symbol *s, *exp; | |
1657 | ||
1658 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1659 | const char *basename; |
b817f6fe SR |
1660 | exp = find_symbol(s->name); |
1661 | if (!exp || exp->module == mod) | |
1662 | continue; | |
6449bd62 | 1663 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1664 | if (basename) |
1665 | basename++; | |
c96fca21 SR |
1666 | else |
1667 | basename = mod->name; | |
1668 | if (!mod->gpl_compatible) | |
1669 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1670 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1671 | } |
b817f6fe SR |
1672 | } |
1673 | ||
5c3ead8c SR |
1674 | /** |
1675 | * Header for the generated file | |
1676 | **/ | |
1677 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1678 | { |
1679 | buf_printf(b, "#include <linux/module.h>\n"); | |
1680 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1681 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1682 | buf_printf(b, "\n"); | |
1683 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1684 | buf_printf(b, "\n"); | |
1da177e4 LT |
1685 | buf_printf(b, "struct module __this_module\n"); |
1686 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1687 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1688 | if (mod->has_init) |
1689 | buf_printf(b, " .init = init_module,\n"); | |
1690 | if (mod->has_cleanup) | |
1691 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1692 | " .exit = cleanup_module,\n" | |
1693 | "#endif\n"); | |
e61a1c1c | 1694 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1695 | buf_printf(b, "};\n"); |
1696 | } | |
1697 | ||
5c725138 | 1698 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1699 | { |
1700 | static const char *staging_dir = "drivers/staging"; | |
1701 | ||
1702 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1703 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1704 | } | |
1705 | ||
5c3ead8c SR |
1706 | /** |
1707 | * Record CRCs for unresolved symbols | |
1708 | **/ | |
c53ddacd | 1709 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1710 | { |
1711 | struct symbol *s, *exp; | |
c53ddacd | 1712 | int err = 0; |
1da177e4 LT |
1713 | |
1714 | for (s = mod->unres; s; s = s->next) { | |
1715 | exp = find_symbol(s->name); | |
1716 | if (!exp || exp->module == mod) { | |
c53ddacd | 1717 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1718 | if (warn_unresolved) { |
1719 | warn("\"%s\" [%s.ko] undefined!\n", | |
1720 | s->name, mod->name); | |
1721 | } else { | |
1722 | merror("\"%s\" [%s.ko] undefined!\n", | |
1723 | s->name, mod->name); | |
1724 | err = 1; | |
1725 | } | |
c53ddacd | 1726 | } |
1da177e4 LT |
1727 | continue; |
1728 | } | |
1729 | s->module = exp->module; | |
1730 | s->crc_valid = exp->crc_valid; | |
1731 | s->crc = exp->crc; | |
1732 | } | |
1733 | ||
1734 | if (!modversions) | |
c53ddacd | 1735 | return err; |
1da177e4 LT |
1736 | |
1737 | buf_printf(b, "\n"); | |
1738 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1739 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1740 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1741 | ||
1742 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1743 | if (!s->module) |
1da177e4 | 1744 | continue; |
1da177e4 | 1745 | if (!s->crc_valid) { |
cb80514d | 1746 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1747 | s->name, mod->name); |
1748 | continue; | |
1749 | } | |
1750 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1751 | } | |
1752 | ||
1753 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1754 | |
1755 | return err; | |
1da177e4 LT |
1756 | } |
1757 | ||
5c3ead8c SR |
1758 | static void add_depends(struct buffer *b, struct module *mod, |
1759 | struct module *modules) | |
1da177e4 LT |
1760 | { |
1761 | struct symbol *s; | |
1762 | struct module *m; | |
1763 | int first = 1; | |
1764 | ||
df578e7d | 1765 | for (m = modules; m; m = m->next) |
1da177e4 | 1766 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1767 | |
1768 | buf_printf(b, "\n"); | |
1769 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1770 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1771 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1772 | buf_printf(b, "\"depends="); | |
1773 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1774 | const char *p; |
1da177e4 LT |
1775 | if (!s->module) |
1776 | continue; | |
1777 | ||
1778 | if (s->module->seen) | |
1779 | continue; | |
1780 | ||
1781 | s->module->seen = 1; | |
df578e7d SR |
1782 | p = strrchr(s->module->name, '/'); |
1783 | if (p) | |
a61b2dfd SR |
1784 | p++; |
1785 | else | |
1786 | p = s->module->name; | |
1787 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1788 | first = 0; |
1789 | } | |
1790 | buf_printf(b, "\";\n"); | |
1791 | } | |
1792 | ||
5c3ead8c | 1793 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1794 | { |
1795 | if (mod->srcversion[0]) { | |
1796 | buf_printf(b, "\n"); | |
1797 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1798 | mod->srcversion); | |
1799 | } | |
1800 | } | |
1801 | ||
5c3ead8c | 1802 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1803 | { |
1804 | char *tmp; | |
1805 | FILE *file; | |
1806 | struct stat st; | |
1807 | ||
1808 | file = fopen(fname, "r"); | |
1809 | if (!file) | |
1810 | goto write; | |
1811 | ||
1812 | if (fstat(fileno(file), &st) < 0) | |
1813 | goto close_write; | |
1814 | ||
1815 | if (st.st_size != b->pos) | |
1816 | goto close_write; | |
1817 | ||
1818 | tmp = NOFAIL(malloc(b->pos)); | |
1819 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1820 | goto free_write; | |
1821 | ||
1822 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1823 | goto free_write; | |
1824 | ||
1825 | free(tmp); | |
1826 | fclose(file); | |
1827 | return; | |
1828 | ||
1829 | free_write: | |
1830 | free(tmp); | |
1831 | close_write: | |
1832 | fclose(file); | |
1833 | write: | |
1834 | file = fopen(fname, "w"); | |
1835 | if (!file) { | |
1836 | perror(fname); | |
1837 | exit(1); | |
1838 | } | |
1839 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1840 | perror(fname); | |
1841 | exit(1); | |
1842 | } | |
1843 | fclose(file); | |
1844 | } | |
1845 | ||
bd5cbced | 1846 | /* parse Module.symvers file. line format: |
534b89a9 | 1847 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1848 | **/ |
040fcc81 | 1849 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1850 | { |
1851 | unsigned long size, pos = 0; | |
1852 | void *file = grab_file(fname, &size); | |
1853 | char *line; | |
1854 | ||
df578e7d | 1855 | if (!file) |
1da177e4 LT |
1856 | /* No symbol versions, silently ignore */ |
1857 | return; | |
1858 | ||
1859 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1860 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1861 | unsigned int crc; |
1862 | struct module *mod; | |
040fcc81 | 1863 | struct symbol *s; |
1da177e4 LT |
1864 | |
1865 | if (!(symname = strchr(line, '\t'))) | |
1866 | goto fail; | |
1867 | *symname++ = '\0'; | |
1868 | if (!(modname = strchr(symname, '\t'))) | |
1869 | goto fail; | |
1870 | *modname++ = '\0'; | |
9ac545b0 | 1871 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1872 | *export++ = '\0'; |
534b89a9 SR |
1873 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1874 | *end = '\0'; | |
1da177e4 LT |
1875 | crc = strtoul(line, &d, 16); |
1876 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1877 | goto fail; | |
df578e7d SR |
1878 | mod = find_module(modname); |
1879 | if (!mod) { | |
1880 | if (is_vmlinux(modname)) | |
1da177e4 | 1881 | have_vmlinux = 1; |
0fa3a88c | 1882 | mod = new_module(modname); |
1da177e4 LT |
1883 | mod->skip = 1; |
1884 | } | |
bd5cbced | 1885 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1886 | s->kernel = kernel; |
1887 | s->preloaded = 1; | |
bd5cbced | 1888 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1889 | } |
1890 | return; | |
1891 | fail: | |
1892 | fatal("parse error in symbol dump file\n"); | |
1893 | } | |
1894 | ||
040fcc81 SR |
1895 | /* For normal builds always dump all symbols. |
1896 | * For external modules only dump symbols | |
1897 | * that are not read from kernel Module.symvers. | |
1898 | **/ | |
1899 | static int dump_sym(struct symbol *sym) | |
1900 | { | |
1901 | if (!external_module) | |
1902 | return 1; | |
1903 | if (sym->vmlinux || sym->kernel) | |
1904 | return 0; | |
1905 | return 1; | |
1906 | } | |
62070fa4 | 1907 | |
5c3ead8c | 1908 | static void write_dump(const char *fname) |
1da177e4 LT |
1909 | { |
1910 | struct buffer buf = { }; | |
1911 | struct symbol *symbol; | |
1912 | int n; | |
1913 | ||
1914 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1915 | symbol = symbolhash[n]; | |
1916 | while (symbol) { | |
040fcc81 | 1917 | if (dump_sym(symbol)) |
bd5cbced | 1918 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1919 | symbol->crc, symbol->name, |
bd5cbced RP |
1920 | symbol->module->name, |
1921 | export_str(symbol->export)); | |
1da177e4 LT |
1922 | symbol = symbol->next; |
1923 | } | |
1924 | } | |
1925 | write_if_changed(&buf, fname); | |
1926 | } | |
1927 | ||
2d04b5ae RH |
1928 | struct ext_sym_list { |
1929 | struct ext_sym_list *next; | |
1930 | const char *file; | |
1931 | }; | |
1932 | ||
5c3ead8c | 1933 | int main(int argc, char **argv) |
1da177e4 LT |
1934 | { |
1935 | struct module *mod; | |
1936 | struct buffer buf = { }; | |
040fcc81 SR |
1937 | char *kernel_read = NULL, *module_read = NULL; |
1938 | char *dump_write = NULL; | |
1da177e4 | 1939 | int opt; |
c53ddacd | 1940 | int err; |
2d04b5ae RH |
1941 | struct ext_sym_list *extsym_iter; |
1942 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 1943 | |
2d04b5ae | 1944 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d SR |
1945 | switch (opt) { |
1946 | case 'i': | |
1947 | kernel_read = optarg; | |
1948 | break; | |
1949 | case 'I': | |
1950 | module_read = optarg; | |
1951 | external_module = 1; | |
1952 | break; | |
4ce6efed SR |
1953 | case 'c': |
1954 | cross_build = 1; | |
1955 | break; | |
2d04b5ae RH |
1956 | case 'e': |
1957 | external_module = 1; | |
1958 | extsym_iter = | |
1959 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
1960 | extsym_iter->next = extsym_start; | |
1961 | extsym_iter->file = optarg; | |
1962 | extsym_start = extsym_iter; | |
1963 | break; | |
df578e7d SR |
1964 | case 'm': |
1965 | modversions = 1; | |
1966 | break; | |
1967 | case 'o': | |
1968 | dump_write = optarg; | |
1969 | break; | |
1970 | case 'a': | |
1971 | all_versions = 1; | |
1972 | break; | |
1973 | case 's': | |
1974 | vmlinux_section_warnings = 0; | |
1975 | break; | |
588ccd73 SR |
1976 | case 'S': |
1977 | sec_mismatch_verbose = 0; | |
1978 | break; | |
df578e7d SR |
1979 | case 'w': |
1980 | warn_unresolved = 1; | |
1981 | break; | |
1982 | default: | |
1983 | exit(1); | |
1da177e4 LT |
1984 | } |
1985 | } | |
1986 | ||
040fcc81 SR |
1987 | if (kernel_read) |
1988 | read_dump(kernel_read, 1); | |
1989 | if (module_read) | |
1990 | read_dump(module_read, 0); | |
2d04b5ae RH |
1991 | while (extsym_start) { |
1992 | read_dump(extsym_start->file, 0); | |
1993 | extsym_iter = extsym_start->next; | |
1994 | free(extsym_start); | |
1995 | extsym_start = extsym_iter; | |
1996 | } | |
1da177e4 | 1997 | |
df578e7d | 1998 | while (optind < argc) |
1da177e4 | 1999 | read_symbols(argv[optind++]); |
1da177e4 | 2000 | |
b817f6fe SR |
2001 | for (mod = modules; mod; mod = mod->next) { |
2002 | if (mod->skip) | |
2003 | continue; | |
c96fca21 | 2004 | check_exports(mod); |
b817f6fe SR |
2005 | } |
2006 | ||
c53ddacd KK |
2007 | err = 0; |
2008 | ||
1da177e4 | 2009 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2010 | char fname[strlen(mod->name) + 10]; |
2011 | ||
1da177e4 LT |
2012 | if (mod->skip) |
2013 | continue; | |
2014 | ||
2015 | buf.pos = 0; | |
2016 | ||
2017 | add_header(&buf, mod); | |
a9860bf0 | 2018 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2019 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2020 | add_depends(&buf, mod, modules); |
2021 | add_moddevtable(&buf, mod); | |
2022 | add_srcversion(&buf, mod); | |
2023 | ||
2024 | sprintf(fname, "%s.mod.c", mod->name); | |
2025 | write_if_changed(&buf, fname); | |
2026 | } | |
2027 | ||
2028 | if (dump_write) | |
2029 | write_dump(dump_write); | |
588ccd73 | 2030 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2031 | warn("modpost: Found %d section mismatch(es).\n" |
2032 | "To see full details build your kernel with:\n" | |
2033 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2034 | sec_mismatch_count); | |
1da177e4 | 2035 | |
c53ddacd | 2036 | return err; |
1da177e4 | 2037 | } |