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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 | 16 | #include <ctype.h> |
5003bab8 | 17 | #include <string.h> |
712f9b46 | 18 | #include <limits.h> |
d4ef1c30 | 19 | #include <stdbool.h> |
eed380f3 | 20 | #include <errno.h> |
1da177e4 | 21 | #include "modpost.h" |
5a865c06 | 22 | #include "../../include/generated/autoconf.h" |
b817f6fe | 23 | #include "../../include/linux/license.h" |
b92021b0 | 24 | #include "../../include/linux/export.h" |
9e1b9b80 | 25 | |
1da177e4 | 26 | /* Are we using CONFIG_MODVERSIONS? */ |
7a3ee753 | 27 | static int modversions = 0; |
1da177e4 | 28 | /* Warn about undefined symbols? (do so if we have vmlinux) */ |
7a3ee753 | 29 | static int have_vmlinux = 0; |
1da177e4 LT |
30 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ |
31 | static int all_versions = 0; | |
040fcc81 SR |
32 | /* If we are modposting external module set to 1 */ |
33 | static int external_module = 0; | |
8d8d8289 SR |
34 | /* Warn about section mismatch in vmlinux if set to 1 */ |
35 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
36 | /* Only warn about unresolved symbols */ |
37 | static int warn_unresolved = 0; | |
bd5cbced | 38 | /* How a symbol is exported */ |
588ccd73 SR |
39 | static int sec_mismatch_count = 0; |
40 | static int sec_mismatch_verbose = 1; | |
47490ec1 | 41 | static int sec_mismatch_fatal = 0; |
eed380f3 GR |
42 | /* ignore missing files */ |
43 | static int ignore_missing_files; | |
588ccd73 | 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 | ||
d4ef1c30 RR |
87 | static inline bool strends(const char *str, const char *postfix) |
88 | { | |
89 | if (strlen(str) < strlen(postfix)) | |
90 | return false; | |
91 | ||
92 | return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; | |
93 | } | |
94 | ||
040fcc81 SR |
95 | static int is_vmlinux(const char *modname) |
96 | { | |
97 | const char *myname; | |
98 | ||
df578e7d SR |
99 | myname = strrchr(modname, '/'); |
100 | if (myname) | |
040fcc81 SR |
101 | myname++; |
102 | else | |
103 | myname = modname; | |
104 | ||
741f98fe SR |
105 | return (strcmp(myname, "vmlinux") == 0) || |
106 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
107 | } |
108 | ||
1da177e4 LT |
109 | void *do_nofail(void *ptr, const char *expr) |
110 | { | |
df578e7d | 111 | if (!ptr) |
1da177e4 | 112 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 113 | |
1da177e4 LT |
114 | return ptr; |
115 | } | |
116 | ||
117 | /* A list of all modules we processed */ | |
1da177e4 LT |
118 | static struct module *modules; |
119 | ||
5c3ead8c | 120 | static struct module *find_module(char *modname) |
1da177e4 LT |
121 | { |
122 | struct module *mod; | |
123 | ||
124 | for (mod = modules; mod; mod = mod->next) | |
125 | if (strcmp(mod->name, modname) == 0) | |
126 | break; | |
127 | return mod; | |
128 | } | |
129 | ||
d4ef1c30 | 130 | static struct module *new_module(const char *modname) |
1da177e4 LT |
131 | { |
132 | struct module *mod; | |
d4ef1c30 | 133 | char *p; |
62070fa4 | 134 | |
1da177e4 LT |
135 | mod = NOFAIL(malloc(sizeof(*mod))); |
136 | memset(mod, 0, sizeof(*mod)); | |
137 | p = NOFAIL(strdup(modname)); | |
138 | ||
139 | /* strip trailing .o */ | |
d4ef1c30 RR |
140 | if (strends(p, ".o")) { |
141 | p[strlen(p) - 2] = '\0'; | |
142 | mod->is_dot_o = 1; | |
143 | } | |
1da177e4 LT |
144 | |
145 | /* add to list */ | |
146 | mod->name = p; | |
b817f6fe | 147 | mod->gpl_compatible = -1; |
1da177e4 LT |
148 | mod->next = modules; |
149 | modules = mod; | |
150 | ||
151 | return mod; | |
152 | } | |
153 | ||
154 | /* A hash of all exported symbols, | |
155 | * struct symbol is also used for lists of unresolved symbols */ | |
156 | ||
157 | #define SYMBOL_HASH_SIZE 1024 | |
158 | ||
159 | struct symbol { | |
160 | struct symbol *next; | |
161 | struct module *module; | |
162 | unsigned int crc; | |
163 | int crc_valid; | |
164 | unsigned int weak:1; | |
040fcc81 SR |
165 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
166 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
167 | * (only for external modules) **/ | |
b6568b1a | 168 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */ |
bd5cbced | 169 | enum export export; /* Type of export */ |
1da177e4 LT |
170 | char name[0]; |
171 | }; | |
172 | ||
173 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
174 | ||
175 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
176 | static inline unsigned int tdb_hash(const char *name) | |
177 | { | |
178 | unsigned value; /* Used to compute the hash value. */ | |
179 | unsigned i; /* Used to cycle through random values. */ | |
180 | ||
181 | /* Set the initial value from the key size. */ | |
df578e7d | 182 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
183 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
184 | ||
185 | return (1103515243 * value + 12345); | |
186 | } | |
187 | ||
5c3ead8c SR |
188 | /** |
189 | * Allocate a new symbols for use in the hash of exported symbols or | |
190 | * the list of unresolved symbols per module | |
191 | **/ | |
192 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
193 | struct symbol *next) | |
1da177e4 LT |
194 | { |
195 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
196 | ||
197 | memset(s, 0, sizeof(*s)); | |
198 | strcpy(s->name, name); | |
199 | s->weak = weak; | |
200 | s->next = next; | |
201 | return s; | |
202 | } | |
203 | ||
204 | /* For the hash of exported symbols */ | |
bd5cbced RP |
205 | static struct symbol *new_symbol(const char *name, struct module *module, |
206 | enum export export) | |
1da177e4 LT |
207 | { |
208 | unsigned int hash; | |
209 | struct symbol *new; | |
210 | ||
211 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
212 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
213 | new->module = module; | |
bd5cbced | 214 | new->export = export; |
040fcc81 | 215 | return new; |
1da177e4 LT |
216 | } |
217 | ||
5c3ead8c | 218 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
219 | { |
220 | struct symbol *s; | |
221 | ||
222 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
223 | if (name[0] == '.') | |
224 | name++; | |
225 | ||
df578e7d | 226 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
227 | if (strcmp(s->name, name) == 0) |
228 | return s; | |
229 | } | |
230 | return NULL; | |
231 | } | |
232 | ||
7a3ee753 | 233 | static const struct { |
bd5cbced RP |
234 | const char *str; |
235 | enum export export; | |
236 | } export_list[] = { | |
237 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 238 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 239 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 240 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
241 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
242 | { .str = "(unknown)", .export = export_unknown }, | |
243 | }; | |
244 | ||
245 | ||
246 | static const char *export_str(enum export ex) | |
247 | { | |
248 | return export_list[ex].str; | |
249 | } | |
250 | ||
df578e7d | 251 | static enum export export_no(const char *s) |
bd5cbced RP |
252 | { |
253 | int i; | |
df578e7d | 254 | |
534b89a9 SR |
255 | if (!s) |
256 | return export_unknown; | |
bd5cbced RP |
257 | for (i = 0; export_list[i].export != export_unknown; i++) { |
258 | if (strcmp(export_list[i].str, s) == 0) | |
259 | return export_list[i].export; | |
260 | } | |
261 | return export_unknown; | |
262 | } | |
263 | ||
62a26356 AIB |
264 | static const char *sec_name(struct elf_info *elf, int secindex); |
265 | ||
266 | #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) | |
267 | ||
268 | static enum export export_from_secname(struct elf_info *elf, unsigned int sec) | |
269 | { | |
270 | const char *secname = sec_name(elf, sec); | |
271 | ||
272 | if (strstarts(secname, "___ksymtab+")) | |
273 | return export_plain; | |
274 | else if (strstarts(secname, "___ksymtab_unused+")) | |
275 | return export_unused; | |
276 | else if (strstarts(secname, "___ksymtab_gpl+")) | |
277 | return export_gpl; | |
278 | else if (strstarts(secname, "___ksymtab_unused_gpl+")) | |
279 | return export_unused_gpl; | |
280 | else if (strstarts(secname, "___ksymtab_gpl_future+")) | |
281 | return export_gpl_future; | |
282 | else | |
283 | return export_unknown; | |
284 | } | |
285 | ||
1ce53adf | 286 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
287 | { |
288 | if (sec == elf->export_sec) | |
289 | return export_plain; | |
c96fca21 SR |
290 | else if (sec == elf->export_unused_sec) |
291 | return export_unused; | |
bd5cbced RP |
292 | else if (sec == elf->export_gpl_sec) |
293 | return export_gpl; | |
c96fca21 SR |
294 | else if (sec == elf->export_unused_gpl_sec) |
295 | return export_unused_gpl; | |
bd5cbced RP |
296 | else if (sec == elf->export_gpl_future_sec) |
297 | return export_gpl_future; | |
298 | else | |
299 | return export_unknown; | |
300 | } | |
301 | ||
5c3ead8c SR |
302 | /** |
303 | * Add an exported symbol - it may have already been added without a | |
304 | * CRC, in this case just update the CRC | |
305 | **/ | |
bd5cbced RP |
306 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
307 | enum export export) | |
1da177e4 LT |
308 | { |
309 | struct symbol *s = find_symbol(name); | |
310 | ||
311 | if (!s) { | |
bd5cbced | 312 | s = new_symbol(name, mod, export); |
8e70c458 SR |
313 | } else { |
314 | if (!s->preloaded) { | |
7b75b13c | 315 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
316 | "was in %s%s\n", mod->name, name, |
317 | s->module->name, | |
318 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f | 319 | } else { |
baec30e4 | 320 | /* In case Module.symvers was out of date */ |
4b21960f | 321 | s->module = mod; |
8e70c458 | 322 | } |
1da177e4 | 323 | } |
8e70c458 | 324 | s->preloaded = 0; |
040fcc81 SR |
325 | s->vmlinux = is_vmlinux(mod->name); |
326 | s->kernel = 0; | |
bd5cbced | 327 | s->export = export; |
040fcc81 SR |
328 | return s; |
329 | } | |
330 | ||
331 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 332 | unsigned int crc, enum export export) |
040fcc81 SR |
333 | { |
334 | struct symbol *s = find_symbol(name); | |
335 | ||
b6568b1a | 336 | if (!s) { |
bd5cbced | 337 | s = new_symbol(name, mod, export); |
b6568b1a RR |
338 | /* Don't complain when we find it later. */ |
339 | s->preloaded = 1; | |
340 | } | |
040fcc81 SR |
341 | s->crc = crc; |
342 | s->crc_valid = 1; | |
1da177e4 LT |
343 | } |
344 | ||
5c3ead8c | 345 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
346 | { |
347 | struct stat st; | |
eb3d5cc6 | 348 | void *map = MAP_FAILED; |
1da177e4 LT |
349 | int fd; |
350 | ||
351 | fd = open(filename, O_RDONLY); | |
eb3d5cc6 | 352 | if (fd < 0) |
1da177e4 | 353 | return NULL; |
eb3d5cc6 JJ |
354 | if (fstat(fd, &st)) |
355 | goto failed; | |
1da177e4 LT |
356 | |
357 | *size = st.st_size; | |
358 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
1da177e4 | 359 | |
eb3d5cc6 JJ |
360 | failed: |
361 | close(fd); | |
1da177e4 LT |
362 | if (map == MAP_FAILED) |
363 | return NULL; | |
364 | return map; | |
365 | } | |
366 | ||
5c3ead8c SR |
367 | /** |
368 | * Return a copy of the next line in a mmap'ed file. | |
369 | * spaces in the beginning of the line is trimmed away. | |
370 | * Return a pointer to a static buffer. | |
371 | **/ | |
df578e7d | 372 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
373 | { |
374 | static char line[4096]; | |
375 | int skip = 1; | |
376 | size_t len = 0; | |
377 | signed char *p = (signed char *)file + *pos; | |
378 | char *s = line; | |
379 | ||
df578e7d | 380 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
381 | if (skip && isspace(*p)) { |
382 | p++; | |
383 | continue; | |
384 | } | |
385 | skip = 0; | |
386 | if (*p != '\n' && (*pos < size)) { | |
387 | len++; | |
388 | *s++ = *p++; | |
389 | if (len > 4095) | |
390 | break; /* Too long, stop */ | |
391 | } else { | |
392 | /* End of string */ | |
393 | *s = '\0'; | |
394 | return line; | |
395 | } | |
396 | } | |
397 | /* End of buffer */ | |
398 | return NULL; | |
399 | } | |
400 | ||
5c3ead8c | 401 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
402 | { |
403 | munmap(file, size); | |
404 | } | |
405 | ||
85bd2fdd | 406 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
407 | { |
408 | unsigned int i; | |
85bd2fdd | 409 | Elf_Ehdr *hdr; |
1da177e4 LT |
410 | Elf_Shdr *sechdrs; |
411 | Elf_Sym *sym; | |
1ce53adf DV |
412 | const char *secstrings; |
413 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
414 | |
415 | hdr = grab_file(filename, &info->size); | |
416 | if (!hdr) { | |
eed380f3 GR |
417 | if (ignore_missing_files) { |
418 | fprintf(stderr, "%s: %s (ignored)\n", filename, | |
419 | strerror(errno)); | |
420 | return 0; | |
421 | } | |
1da177e4 | 422 | perror(filename); |
6803dc0e | 423 | exit(1); |
1da177e4 LT |
424 | } |
425 | info->hdr = hdr; | |
85bd2fdd SR |
426 | if (info->size < sizeof(*hdr)) { |
427 | /* file too small, assume this is an empty .o file */ | |
428 | return 0; | |
429 | } | |
430 | /* Is this a valid ELF file? */ | |
431 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
432 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
433 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
434 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
435 | /* Not an ELF file - silently ignore it */ | |
436 | return 0; | |
437 | } | |
1da177e4 | 438 | /* Fix endianness in ELF header */ |
7d875a02 AK |
439 | hdr->e_type = TO_NATIVE(hdr->e_type); |
440 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
441 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
442 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
443 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
444 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
445 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
446 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
447 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
448 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
449 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
450 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
451 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
452 | sechdrs = (void *)hdr + hdr->e_shoff; |
453 | info->sechdrs = sechdrs; | |
454 | ||
a83710e5 PS |
455 | /* Check if file offset is correct */ |
456 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
457 | fatal("section header offset=%lu in file '%s' is bigger than " |
458 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
459 | filename, info->size); | |
a83710e5 PS |
460 | return 0; |
461 | } | |
462 | ||
6845756b | 463 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
464 | /* |
465 | * There are more than 64k sections, | |
466 | * read count from .sh_size. | |
1ce53adf DV |
467 | */ |
468 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
469 | } | |
470 | else { | |
471 | info->num_sections = hdr->e_shnum; | |
472 | } | |
473 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 474 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
475 | } |
476 | else { | |
477 | info->secindex_strings = hdr->e_shstrndx; | |
478 | } | |
479 | ||
1da177e4 | 480 | /* Fix endianness in section headers */ |
1ce53adf | 481 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
482 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
483 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
484 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
485 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
486 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
487 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
488 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
489 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
490 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
491 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
492 | } |
493 | /* Find symbol table. */ | |
1ce53adf DV |
494 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
495 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 496 | const char *secname; |
56fc82c5 | 497 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 498 | |
56fc82c5 | 499 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
500 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
501 | "sizeof(*hrd)=%zu\n", filename, | |
502 | (unsigned long)sechdrs[i].sh_offset, | |
503 | sizeof(*hdr)); | |
85bd2fdd SR |
504 | return 0; |
505 | } | |
bd5cbced RP |
506 | secname = secstrings + sechdrs[i].sh_name; |
507 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
508 | if (nobits) |
509 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
510 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
511 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
512 | } else if (strcmp(secname, "__ksymtab") == 0) |
513 | info->export_sec = i; | |
c96fca21 SR |
514 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
515 | info->export_unused_sec = i; | |
bd5cbced RP |
516 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
517 | info->export_gpl_sec = i; | |
c96fca21 SR |
518 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
519 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
520 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
521 | info->export_gpl_future_sec = i; | |
522 | ||
1ce53adf DV |
523 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
524 | unsigned int sh_link_idx; | |
525 | symtab_idx = i; | |
526 | info->symtab_start = (void *)hdr + | |
527 | sechdrs[i].sh_offset; | |
528 | info->symtab_stop = (void *)hdr + | |
529 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 530 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
531 | info->strtab = (void *)hdr + |
532 | sechdrs[sh_link_idx].sh_offset; | |
533 | } | |
1da177e4 | 534 | |
1ce53adf DV |
535 | /* 32bit section no. table? ("more than 64k sections") */ |
536 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
537 | symtab_shndx_idx = i; | |
538 | info->symtab_shndx_start = (void *)hdr + | |
539 | sechdrs[i].sh_offset; | |
540 | info->symtab_shndx_stop = (void *)hdr + | |
541 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
542 | } | |
1da177e4 | 543 | } |
df578e7d | 544 | if (!info->symtab_start) |
cb80514d | 545 | fatal("%s has no symtab?\n", filename); |
df578e7d | 546 | |
1da177e4 LT |
547 | /* Fix endianness in symbols */ |
548 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
549 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
550 | sym->st_name = TO_NATIVE(sym->st_name); | |
551 | sym->st_value = TO_NATIVE(sym->st_value); | |
552 | sym->st_size = TO_NATIVE(sym->st_size); | |
553 | } | |
1ce53adf DV |
554 | |
555 | if (symtab_shndx_idx != ~0U) { | |
556 | Elf32_Word *p; | |
6845756b | 557 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 558 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 559 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
560 | symtab_idx); |
561 | /* Fix endianness */ | |
562 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
563 | p++) | |
564 | *p = TO_NATIVE(*p); | |
565 | } | |
566 | ||
85bd2fdd | 567 | return 1; |
1da177e4 LT |
568 | } |
569 | ||
5c3ead8c | 570 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
571 | { |
572 | release_file(info->hdr, info->size); | |
573 | } | |
574 | ||
4d7365d6 SR |
575 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
576 | { | |
577 | /* ignore __this_module, it will be resolved shortly */ | |
b92021b0 | 578 | if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0) |
4d7365d6 SR |
579 | return 1; |
580 | /* ignore global offset table */ | |
581 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
582 | return 1; | |
583 | if (info->hdr->e_machine == EM_PPC) | |
584 | /* Special register function linked on all modules during final link of .ko */ | |
585 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
586 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
587 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
8fe9c93e AS |
588 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 || |
589 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
590 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
4d7365d6 | 591 | return 1; |
7fca5dc8 SR |
592 | if (info->hdr->e_machine == EM_PPC64) |
593 | /* Special register function linked on all modules during final link of .ko */ | |
594 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
8fe9c93e AS |
595 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 || |
596 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
597 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
7fca5dc8 | 598 | return 1; |
4d7365d6 SR |
599 | /* Do not ignore this symbol */ |
600 | return 0; | |
601 | } | |
602 | ||
b92021b0 RR |
603 | #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_) |
604 | #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_) | |
1da177e4 | 605 | |
5c3ead8c SR |
606 | static void handle_modversions(struct module *mod, struct elf_info *info, |
607 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
608 | { |
609 | unsigned int crc; | |
62a26356 AIB |
610 | enum export export; |
611 | ||
258f7426 FR |
612 | if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
613 | strncmp(symname, "__ksymtab", 9) == 0) | |
62a26356 AIB |
614 | export = export_from_secname(info, get_secindex(info, sym)); |
615 | else | |
616 | export = export_from_sec(info, get_secindex(info, sym)); | |
1da177e4 | 617 | |
b5064654 AK |
618 | /* CRC'd symbol */ |
619 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
620 | crc = (unsigned int) sym->st_value; | |
621 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, | |
622 | export); | |
623 | } | |
624 | ||
1da177e4 LT |
625 | switch (sym->st_shndx) { |
626 | case SHN_COMMON: | |
ef178f92 AK |
627 | if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) { |
628 | /* Should warn here, but modpost runs before the linker */ | |
629 | } else | |
630 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); | |
1da177e4 | 631 | break; |
1da177e4 LT |
632 | case SHN_UNDEF: |
633 | /* undefined symbol */ | |
634 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
635 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
636 | break; | |
4d7365d6 | 637 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 638 | break; |
8d529014 BC |
639 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
640 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
641 | /* add compatibility with older glibc */ | |
642 | #ifndef STT_SPARC_REGISTER | |
643 | #define STT_SPARC_REGISTER STT_REGISTER | |
644 | #endif | |
1da177e4 LT |
645 | if (info->hdr->e_machine == EM_SPARC || |
646 | info->hdr->e_machine == EM_SPARCV9) { | |
647 | /* Ignore register directives. */ | |
8d529014 | 648 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 649 | break; |
62070fa4 SR |
650 | if (symname[0] == '.') { |
651 | char *munged = strdup(symname); | |
652 | munged[0] = '_'; | |
653 | munged[1] = toupper(munged[1]); | |
654 | symname = munged; | |
655 | } | |
1da177e4 LT |
656 | } |
657 | #endif | |
62070fa4 | 658 | |
b92021b0 RR |
659 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
660 | if (symname[0] != '_') | |
661 | break; | |
662 | else | |
663 | symname++; | |
664 | #endif | |
665 | mod->unres = alloc_symbol(symname, | |
666 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
667 | mod->unres); | |
1da177e4 LT |
668 | break; |
669 | default: | |
670 | /* All exported symbols */ | |
8d99513c | 671 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
672 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
673 | export); | |
1da177e4 | 674 | } |
b92021b0 | 675 | if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0) |
1da177e4 | 676 | mod->has_init = 1; |
b92021b0 | 677 | if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0) |
1da177e4 LT |
678 | mod->has_cleanup = 1; |
679 | break; | |
680 | } | |
681 | } | |
682 | ||
5c3ead8c SR |
683 | /** |
684 | * Parse tag=value strings from .modinfo section | |
685 | **/ | |
1da177e4 LT |
686 | static char *next_string(char *string, unsigned long *secsize) |
687 | { | |
688 | /* Skip non-zero chars */ | |
689 | while (string[0]) { | |
690 | string++; | |
691 | if ((*secsize)-- <= 1) | |
692 | return NULL; | |
693 | } | |
694 | ||
695 | /* Skip any zero padding. */ | |
696 | while (!string[0]) { | |
697 | string++; | |
698 | if ((*secsize)-- <= 1) | |
699 | return NULL; | |
700 | } | |
701 | return string; | |
702 | } | |
703 | ||
b817f6fe SR |
704 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
705 | const char *tag, char *info) | |
1da177e4 LT |
706 | { |
707 | char *p; | |
708 | unsigned int taglen = strlen(tag); | |
709 | unsigned long size = modinfo_len; | |
710 | ||
b817f6fe SR |
711 | if (info) { |
712 | size -= info - (char *)modinfo; | |
713 | modinfo = next_string(info, &size); | |
714 | } | |
715 | ||
1da177e4 LT |
716 | for (p = modinfo; p; p = next_string(p, &size)) { |
717 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
718 | return p + taglen + 1; | |
719 | } | |
720 | return NULL; | |
721 | } | |
722 | ||
b817f6fe SR |
723 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
724 | const char *tag) | |
725 | ||
726 | { | |
727 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
728 | } | |
729 | ||
4c8fbca5 SR |
730 | /** |
731 | * Test if string s ends in string sub | |
732 | * return 0 if match | |
733 | **/ | |
734 | static int strrcmp(const char *s, const char *sub) | |
735 | { | |
df578e7d | 736 | int slen, sublen; |
62070fa4 | 737 | |
4c8fbca5 SR |
738 | if (!s || !sub) |
739 | return 1; | |
62070fa4 | 740 | |
4c8fbca5 | 741 | slen = strlen(s); |
df578e7d | 742 | sublen = strlen(sub); |
62070fa4 | 743 | |
4c8fbca5 SR |
744 | if ((slen == 0) || (sublen == 0)) |
745 | return 1; | |
746 | ||
df578e7d SR |
747 | if (sublen > slen) |
748 | return 1; | |
4c8fbca5 | 749 | |
df578e7d | 750 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
751 | } |
752 | ||
ff13f926 SR |
753 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
754 | { | |
58fb0d4f SR |
755 | if (sym) |
756 | return elf->strtab + sym->st_name; | |
757 | else | |
f666751a | 758 | return "(unknown)"; |
ff13f926 SR |
759 | } |
760 | ||
1ce53adf | 761 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
762 | { |
763 | Elf_Shdr *sechdrs = elf->sechdrs; | |
764 | return (void *)elf->hdr + | |
1ce53adf DV |
765 | elf->sechdrs[elf->secindex_strings].sh_offset + |
766 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
767 | } |
768 | ||
769 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
770 | { | |
771 | return (void *)elf->hdr + | |
1ce53adf DV |
772 | elf->sechdrs[elf->secindex_strings].sh_offset + |
773 | sechdr->sh_name; | |
ff13f926 SR |
774 | } |
775 | ||
10668220 SR |
776 | /* The pattern is an array of simple patterns. |
777 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 778 | * "*foo" will match a string that ends with "foo" |
10668220 | 779 | * "foo*" will match a string that begins with "foo" |
09c20c03 | 780 | * "*foo*" will match a string that contains "foo" |
10668220 | 781 | */ |
5c725138 | 782 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
783 | { |
784 | const char *p; | |
785 | while (*pat) { | |
786 | p = *pat++; | |
787 | const char *endp = p + strlen(p) - 1; | |
788 | ||
09c20c03 PG |
789 | /* "*foo*" */ |
790 | if (*p == '*' && *endp == '*') { | |
791 | char *here, *bare = strndup(p + 1, strlen(p) - 2); | |
792 | ||
793 | here = strstr(sym, bare); | |
794 | free(bare); | |
795 | if (here != NULL) | |
796 | return 1; | |
797 | } | |
6c5bd235 | 798 | /* "*foo" */ |
09c20c03 | 799 | else if (*p == '*') { |
6c5bd235 SR |
800 | if (strrcmp(sym, p + 1) == 0) |
801 | return 1; | |
802 | } | |
10668220 | 803 | /* "foo*" */ |
6c5bd235 | 804 | else if (*endp == '*') { |
10668220 SR |
805 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
806 | return 1; | |
807 | } | |
10668220 SR |
808 | /* no wildcards */ |
809 | else { | |
810 | if (strcmp(p, sym) == 0) | |
811 | return 1; | |
812 | } | |
813 | } | |
814 | /* no match */ | |
815 | return 0; | |
816 | } | |
817 | ||
10668220 | 818 | /* sections that we do not want to do full section mismatch check on */ |
7a3ee753 | 819 | static const char *const section_white_list[] = |
4391ed6a SR |
820 | { |
821 | ".comment*", | |
822 | ".debug*", | |
4d10c223 | 823 | ".cranges", /* sh64 */ |
1121584f | 824 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 825 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 826 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
827 | ".mdebug*", /* alpha, score, mips etc. */ |
828 | ".pdr", /* alpha, score, mips etc. */ | |
829 | ".stab*", | |
830 | ".note*", | |
831 | ".got*", | |
832 | ".toc*", | |
af42e970 MF |
833 | ".xt.prop", /* xtensa */ |
834 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
835 | ".arcextmap*", /* arc */ |
836 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
d1189c63 NC |
837 | ".cmem*", /* EZchip */ |
838 | ".fmt_slot*", /* EZchip */ | |
ef178f92 | 839 | ".gnu.lto*", |
4391ed6a SR |
840 | NULL |
841 | }; | |
10668220 | 842 | |
e241a630 | 843 | /* |
b614a697 | 844 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 845 | * The cause of this is often a section specified in assembler |
b614a697 | 846 | * without "ax" / "aw". |
e241a630 | 847 | */ |
b614a697 | 848 | static void check_section(const char *modname, struct elf_info *elf, |
bb66fc67 | 849 | Elf_Shdr *sechdr) |
e241a630 | 850 | { |
b614a697 AK |
851 | const char *sec = sech_name(elf, sechdr); |
852 | ||
853 | if (sechdr->sh_type == SHT_PROGBITS && | |
854 | !(sechdr->sh_flags & SHF_ALLOC) && | |
855 | !match(sec, section_white_list)) { | |
856 | warn("%s (%s): unexpected non-allocatable section.\n" | |
857 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
858 | "Note that for example <linux/init.h> contains\n" | |
859 | "section definitions for use in .S files.\n\n", | |
860 | modname, sec); | |
e241a630 | 861 | } |
e241a630 SR |
862 | } |
863 | ||
864 | ||
865 | ||
eb8f6890 | 866 | #define ALL_INIT_DATA_SECTIONS \ |
a0d8f803 RV |
867 | ".init.setup", ".init.rodata", ".meminit.rodata", \ |
868 | ".init.data", ".meminit.data" | |
eb8f6890 | 869 | #define ALL_EXIT_DATA_SECTIONS \ |
a0d8f803 | 870 | ".exit.data", ".memexit.data" |
10668220 | 871 | |
eb8f6890 | 872 | #define ALL_INIT_TEXT_SECTIONS \ |
a0d8f803 | 873 | ".init.text", ".meminit.text" |
eb8f6890 | 874 | #define ALL_EXIT_TEXT_SECTIONS \ |
a0d8f803 | 875 | ".exit.text", ".memexit.text" |
10668220 | 876 | |
bb15d8db | 877 | #define ALL_PCI_INIT_SECTIONS \ |
a0d8f803 RV |
878 | ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \ |
879 | ".pci_fixup_enable", ".pci_fixup_resume", \ | |
880 | ".pci_fixup_resume_early", ".pci_fixup_suspend" | |
bb15d8db | 881 | |
e24f6628 PG |
882 | #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS |
883 | #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS | |
4a31a229 UKK |
884 | |
885 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
886 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 887 | |
a0d8f803 | 888 | #define DATA_SECTIONS ".data", ".data.rel" |
157d1972 QC |
889 | #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \ |
890 | ".kprobes.text" | |
52dc0595 | 891 | #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \ |
673c2c34 CM |
892 | ".fixup", ".entry.text", ".exception.text", ".text.*", \ |
893 | ".coldtext" | |
10668220 | 894 | |
fd6c3a8d | 895 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d | 896 | #define MEM_INIT_SECTIONS ".meminit.*" |
eb8f6890 | 897 | |
fd6c3a8d | 898 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d | 899 | #define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f6890 | 900 | |
52dc0595 QC |
901 | #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \ |
902 | TEXT_SECTIONS, OTHER_TEXT_SECTIONS | |
903 | ||
6c5bd235 | 904 | /* init data sections */ |
7a3ee753 MK |
905 | static const char *const init_data_sections[] = |
906 | { ALL_INIT_DATA_SECTIONS, NULL }; | |
6c5bd235 SR |
907 | |
908 | /* all init sections */ | |
7a3ee753 | 909 | static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
910 | |
911 | /* All init and exit sections (code + data) */ | |
7a3ee753 | 912 | static const char *const init_exit_sections[] = |
eb8f6890 | 913 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 | 914 | |
4a3893d0 PG |
915 | /* all text sections */ |
916 | static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL }; | |
917 | ||
6c5bd235 | 918 | /* data section */ |
7a3ee753 | 919 | static const char *const data_sections[] = { DATA_SECTIONS, NULL }; |
6c5bd235 | 920 | |
6c5bd235 SR |
921 | |
922 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
923 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
924 | "*driver", \ | |
925 | "*_template", /* scsi uses *_template a lot */ \ | |
926 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
927 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
928 | "*_ops", \ | |
929 | "*_probe", \ | |
930 | "*_probe_one", \ | |
931 | "*_console" | |
6c5bd235 | 932 | |
7a3ee753 MK |
933 | static const char *const head_sections[] = { ".head.text*", NULL }; |
934 | static const char *const linker_symbols[] = | |
6c5bd235 | 935 | { "__init_begin", "_sinittext", "_einittext", NULL }; |
4a3893d0 | 936 | static const char *const optim_symbols[] = { "*.constprop.*", NULL }; |
6c5bd235 | 937 | |
588ccd73 | 938 | enum mismatch { |
bbd3f4fb UKK |
939 | TEXT_TO_ANY_INIT, |
940 | DATA_TO_ANY_INIT, | |
941 | TEXT_TO_ANY_EXIT, | |
942 | DATA_TO_ANY_EXIT, | |
943 | XXXINIT_TO_SOME_INIT, | |
944 | XXXEXIT_TO_SOME_EXIT, | |
945 | ANY_INIT_TO_ANY_EXIT, | |
946 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 | 947 | EXPORT_TO_INIT_EXIT, |
52dc0595 | 948 | EXTABLE_TO_NON_TEXT, |
588ccd73 SR |
949 | }; |
950 | ||
e5d8f59a QC |
951 | /** |
952 | * Describe how to match sections on different criterias: | |
953 | * | |
954 | * @fromsec: Array of sections to be matched. | |
955 | * | |
956 | * @bad_tosec: Relocations applied to a section in @fromsec to a section in | |
957 | * this array is forbidden (black-list). Can be empty. | |
958 | * | |
959 | * @good_tosec: Relocations applied to a section in @fromsec must be | |
960 | * targetting sections in this array (white-list). Can be empty. | |
961 | * | |
962 | * @mismatch: Type of mismatch. | |
963 | * | |
964 | * @symbol_white_list: Do not match a relocation to a symbol in this list | |
965 | * even if it is targetting a section in @bad_to_sec. | |
966 | * | |
967 | * @handler: Specific handler to call when a match is found. If NULL, | |
968 | * default_mismatch_handler() will be called. | |
969 | * | |
970 | */ | |
10668220 SR |
971 | struct sectioncheck { |
972 | const char *fromsec[20]; | |
050e57fd QC |
973 | const char *bad_tosec[20]; |
974 | const char *good_tosec[20]; | |
588ccd73 | 975 | enum mismatch mismatch; |
af92a82d | 976 | const char *symbol_white_list[20]; |
644e8f14 QC |
977 | void (*handler)(const char *modname, struct elf_info *elf, |
978 | const struct sectioncheck* const mismatch, | |
979 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec); | |
980 | ||
10668220 SR |
981 | }; |
982 | ||
52dc0595 QC |
983 | static void extable_mismatch_handler(const char *modname, struct elf_info *elf, |
984 | const struct sectioncheck* const mismatch, | |
985 | Elf_Rela *r, Elf_Sym *sym, | |
986 | const char *fromsec); | |
987 | ||
7a3ee753 | 988 | static const struct sectioncheck sectioncheck[] = { |
10668220 SR |
989 | /* Do not reference init/exit code/data from |
990 | * normal code and data | |
991 | */ | |
992 | { | |
588ccd73 | 993 | .fromsec = { TEXT_SECTIONS, NULL }, |
050e57fd | 994 | .bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 995 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 996 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
997 | }, |
998 | { | |
999 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 1000 | .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 1001 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 1002 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 1003 | }, |
0db25245 UKK |
1004 | { |
1005 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 1006 | .bad_tosec = { INIT_SECTIONS, NULL }, |
0db25245 UKK |
1007 | .mismatch = DATA_TO_ANY_INIT, |
1008 | .symbol_white_list = { | |
1009 | "*_template", "*_timer", "*_sht", "*_ops", | |
1010 | "*_probe", "*_probe_one", "*_console", NULL | |
1011 | }, | |
1012 | }, | |
588ccd73 SR |
1013 | { |
1014 | .fromsec = { TEXT_SECTIONS, NULL }, | |
050e57fd | 1015 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1016 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 1017 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
1018 | }, |
1019 | { | |
1020 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 1021 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1022 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 1023 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 1024 | }, |
e24f6628 | 1025 | /* Do not reference init code/data from meminit code/data */ |
eb8f6890 | 1026 | { |
4a31a229 | 1027 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
050e57fd | 1028 | .bad_tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 1029 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 1030 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 1031 | }, |
e24f6628 | 1032 | /* Do not reference exit code/data from memexit code/data */ |
eb8f6890 | 1033 | { |
4a31a229 | 1034 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
050e57fd | 1035 | .bad_tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1036 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1037 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1038 | }, |
1039 | /* Do not use exit code/data from init code */ | |
1040 | { | |
eb8f6890 | 1041 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
050e57fd | 1042 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1043 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 1044 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1045 | }, |
1046 | /* Do not use init code/data from exit code */ | |
1047 | { | |
eb8f6890 | 1048 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
050e57fd | 1049 | .bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1050 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1051 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1052 | }, |
bb15d8db SAS |
1053 | { |
1054 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
050e57fd | 1055 | .bad_tosec = { INIT_SECTIONS, NULL }, |
bb15d8db SAS |
1056 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
1057 | .symbol_white_list = { NULL }, | |
1058 | }, | |
10668220 SR |
1059 | /* Do not export init/exit functions or data */ |
1060 | { | |
1061 | .fromsec = { "__ksymtab*", NULL }, | |
050e57fd | 1062 | .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1063 | .mismatch = EXPORT_TO_INIT_EXIT, |
1064 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
52dc0595 QC |
1065 | }, |
1066 | { | |
1067 | .fromsec = { "__ex_table", NULL }, | |
1068 | /* If you're adding any new black-listed sections in here, consider | |
1069 | * adding a special 'printer' for them in scripts/check_extable. | |
1070 | */ | |
1071 | .bad_tosec = { ".altinstr_replacement", NULL }, | |
1072 | .good_tosec = {ALL_TEXT_SECTIONS , NULL}, | |
1073 | .mismatch = EXTABLE_TO_NON_TEXT, | |
1074 | .handler = extable_mismatch_handler, | |
10668220 SR |
1075 | } |
1076 | }; | |
1077 | ||
0d2a636e UKK |
1078 | static const struct sectioncheck *section_mismatch( |
1079 | const char *fromsec, const char *tosec) | |
10668220 SR |
1080 | { |
1081 | int i; | |
1082 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1083 | const struct sectioncheck *check = §ioncheck[0]; | |
1084 | ||
c5c3439a QC |
1085 | /* |
1086 | * The target section could be the SHT_NUL section when we're | |
1087 | * handling relocations to un-resolved symbols, trying to match it | |
1088 | * doesn't make much sense and causes build failures on parisc and | |
1089 | * mn10300 architectures. | |
1090 | */ | |
1091 | if (*tosec == '\0') | |
1092 | return NULL; | |
1093 | ||
10668220 | 1094 | for (i = 0; i < elems; i++) { |
050e57fd QC |
1095 | if (match(fromsec, check->fromsec)) { |
1096 | if (check->bad_tosec[0] && match(tosec, check->bad_tosec)) | |
1097 | return check; | |
1098 | if (check->good_tosec[0] && !match(tosec, check->good_tosec)) | |
1099 | return check; | |
1100 | } | |
10668220 SR |
1101 | check++; |
1102 | } | |
0d2a636e | 1103 | return NULL; |
10668220 SR |
1104 | } |
1105 | ||
4c8fbca5 SR |
1106 | /** |
1107 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1108 | * |
4c8fbca5 SR |
1109 | * Pattern 1: |
1110 | * If a module parameter is declared __initdata and permissions=0 | |
1111 | * then this is legal despite the warning generated. | |
1112 | * We cannot see value of permissions here, so just ignore | |
1113 | * this pattern. | |
1114 | * The pattern is identified by: | |
1115 | * tosec = .init.data | |
9209aed0 | 1116 | * fromsec = .data* |
4c8fbca5 | 1117 | * atsym =__param* |
62070fa4 | 1118 | * |
6a841528 RR |
1119 | * Pattern 1a: |
1120 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1121 | * The pattern is identified by: | |
1122 | * tosec = .init.text | |
1123 | * fromsec = .data* | |
1124 | * atsym = __param_ops_* | |
1125 | * | |
4c8fbca5 | 1126 | * Pattern 2: |
72ee59b5 | 1127 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1128 | * add, remove, probe functions etc. |
4c8fbca5 | 1129 | * the pattern is identified by: |
83cda2bb SR |
1130 | * tosec = init or exit section |
1131 | * fromsec = data section | |
df578e7d SR |
1132 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1133 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1134 | * |
1135 | * Pattern 3: | |
c993971f | 1136 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1137 | * |
1d8af559 | 1138 | * Pattern 4: |
ee6a8545 VG |
1139 | * Some symbols belong to init section but still it is ok to reference |
1140 | * these from non-init sections as these symbols don't have any memory | |
1141 | * allocated for them and symbol address and value are same. So even | |
1142 | * if init section is freed, its ok to reference those symbols. | |
1143 | * For ex. symbols marking the init section boundaries. | |
1144 | * This pattern is identified by | |
1145 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1146 | * |
4a3893d0 PG |
1147 | * Pattern 5: |
1148 | * GCC may optimize static inlines when fed constant arg(s) resulting | |
1149 | * in functions like cpumask_empty() -- generating an associated symbol | |
1150 | * cpumask_empty.constprop.3 that appears in the audit. If the const that | |
1151 | * is passed in comes from __init, like say nmi_ipi_mask, we get a | |
1152 | * meaningless section warning. May need to add isra symbols too... | |
1153 | * This pattern is identified by | |
1154 | * tosec = init section | |
1155 | * fromsec = text section | |
1156 | * refsymname = *.constprop.* | |
1157 | * | |
4c8fbca5 | 1158 | **/ |
af92a82d UKK |
1159 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1160 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1161 | const char *tosec, const char *tosym) |
4c8fbca5 | 1162 | { |
4c8fbca5 | 1163 | /* Check for pattern 1 */ |
6c5bd235 SR |
1164 | if (match(tosec, init_data_sections) && |
1165 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1166 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1167 | return 0; | |
4c8fbca5 | 1168 | |
6a841528 RR |
1169 | /* Check for pattern 1a */ |
1170 | if (strcmp(tosec, ".init.text") == 0 && | |
1171 | match(fromsec, data_sections) && | |
1172 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1173 | return 0; | |
1174 | ||
4c8fbca5 | 1175 | /* Check for pattern 2 */ |
6c5bd235 SR |
1176 | if (match(tosec, init_exit_sections) && |
1177 | match(fromsec, data_sections) && | |
af92a82d | 1178 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1179 | return 0; |
4c8fbca5 | 1180 | |
9bf8cb9b | 1181 | /* Check for pattern 3 */ |
6c5bd235 SR |
1182 | if (match(fromsec, head_sections) && |
1183 | match(tosec, init_sections)) | |
58fb0d4f | 1184 | return 0; |
9bf8cb9b | 1185 | |
1d8af559 | 1186 | /* Check for pattern 4 */ |
58fb0d4f SR |
1187 | if (match(tosym, linker_symbols)) |
1188 | return 0; | |
9bf8cb9b | 1189 | |
4a3893d0 PG |
1190 | /* Check for pattern 5 */ |
1191 | if (match(fromsec, text_sections) && | |
1192 | match(tosec, init_sections) && | |
1193 | match(fromsym, optim_symbols)) | |
1194 | return 0; | |
1195 | ||
58fb0d4f | 1196 | return 1; |
4c8fbca5 SR |
1197 | } |
1198 | ||
93684d3b SR |
1199 | /** |
1200 | * Find symbol based on relocation record info. | |
1201 | * In some cases the symbol supplied is a valid symbol so | |
1202 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1203 | * In other cases the symbol needs to be looked up in the symbol table | |
1204 | * based on section and address. | |
1205 | * **/ | |
9ad21c3f | 1206 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1207 | Elf_Sym *relsym) |
1208 | { | |
1209 | Elf_Sym *sym; | |
9ad21c3f SR |
1210 | Elf_Sym *near = NULL; |
1211 | Elf64_Sword distance = 20; | |
1212 | Elf64_Sword d; | |
1ce53adf | 1213 | unsigned int relsym_secindex; |
93684d3b SR |
1214 | |
1215 | if (relsym->st_name != 0) | |
1216 | return relsym; | |
1ce53adf DV |
1217 | |
1218 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1219 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1220 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1221 | continue; |
ae4ac123 AN |
1222 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1223 | continue; | |
93684d3b SR |
1224 | if (sym->st_value == addr) |
1225 | return sym; | |
9ad21c3f SR |
1226 | /* Find a symbol nearby - addr are maybe negative */ |
1227 | d = sym->st_value - addr; | |
1228 | if (d < 0) | |
1229 | d = addr - sym->st_value; | |
1230 | if (d < distance) { | |
1231 | distance = d; | |
1232 | near = sym; | |
1233 | } | |
93684d3b | 1234 | } |
9ad21c3f SR |
1235 | /* We need a close match */ |
1236 | if (distance < 20) | |
1237 | return near; | |
1238 | else | |
1239 | return NULL; | |
93684d3b SR |
1240 | } |
1241 | ||
da68d61f DB |
1242 | static inline int is_arm_mapping_symbol(const char *str) |
1243 | { | |
6c34f1f5 | 1244 | return str[0] == '$' && strchr("axtd", str[1]) |
da68d61f DB |
1245 | && (str[2] == '\0' || str[2] == '.'); |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1250 | * one of the magic symbols emitted used by current ARM tools. | |
1251 | * | |
1252 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1253 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1254 | * only by merging __exit and __init sections into __text, bloating | |
1255 | * the kernel (which is especially evil on embedded platforms). | |
1256 | */ | |
1257 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1258 | { | |
1259 | const char *name = elf->strtab + sym->st_name; | |
1260 | ||
1261 | if (!name || !strlen(name)) | |
1262 | return 0; | |
1263 | return !is_arm_mapping_symbol(name); | |
1264 | } | |
1265 | ||
b39927cf | 1266 | /* |
43c74d17 SR |
1267 | * Find symbols before or equal addr and after addr - in the section sec. |
1268 | * If we find two symbols with equal offset prefer one with a valid name. | |
1269 | * The ELF format may have a better way to detect what type of symbol | |
1270 | * it is, but this works for now. | |
b39927cf | 1271 | **/ |
157c23c8 SR |
1272 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1273 | const char *sec) | |
b39927cf SR |
1274 | { |
1275 | Elf_Sym *sym; | |
157c23c8 | 1276 | Elf_Sym *near = NULL; |
157c23c8 | 1277 | Elf_Addr distance = ~0; |
62070fa4 | 1278 | |
b39927cf SR |
1279 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1280 | const char *symsec; | |
1281 | ||
1ce53adf | 1282 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1283 | continue; |
1ce53adf | 1284 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1285 | if (strcmp(symsec, sec) != 0) |
1286 | continue; | |
da68d61f DB |
1287 | if (!is_valid_name(elf, sym)) |
1288 | continue; | |
b39927cf | 1289 | if (sym->st_value <= addr) { |
157c23c8 SR |
1290 | if ((addr - sym->st_value) < distance) { |
1291 | distance = addr - sym->st_value; | |
1292 | near = sym; | |
1293 | } else if ((addr - sym->st_value) == distance) { | |
1294 | near = sym; | |
43c74d17 | 1295 | } |
b39927cf SR |
1296 | } |
1297 | } | |
157c23c8 | 1298 | return near; |
b39927cf SR |
1299 | } |
1300 | ||
588ccd73 SR |
1301 | /* |
1302 | * Convert a section name to the function/data attribute | |
1303 | * .init.text => __init | |
588ccd73 SR |
1304 | * .memexitconst => __memconst |
1305 | * etc. | |
cbcf14a9 AS |
1306 | * |
1307 | * The memory of returned value has been allocated on a heap. The user of this | |
1308 | * method should free it after usage. | |
588ccd73 SR |
1309 | */ |
1310 | static char *sec2annotation(const char *s) | |
1311 | { | |
1312 | if (match(s, init_exit_sections)) { | |
1313 | char *p = malloc(20); | |
1314 | char *r = p; | |
1315 | ||
1316 | *p++ = '_'; | |
1317 | *p++ = '_'; | |
1318 | if (*s == '.') | |
1319 | s++; | |
1320 | while (*s && *s != '.') | |
1321 | *p++ = *s++; | |
1322 | *p = '\0'; | |
1323 | if (*s == '.') | |
1324 | s++; | |
1325 | if (strstr(s, "rodata") != NULL) | |
1326 | strcat(p, "const "); | |
1327 | else if (strstr(s, "data") != NULL) | |
1328 | strcat(p, "data "); | |
1329 | else | |
1330 | strcat(p, " "); | |
cbcf14a9 | 1331 | return r; |
588ccd73 | 1332 | } else { |
5003bab8 | 1333 | return strdup(""); |
588ccd73 SR |
1334 | } |
1335 | } | |
1336 | ||
1337 | static int is_function(Elf_Sym *sym) | |
1338 | { | |
1339 | if (sym) | |
1340 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1341 | else | |
f666751a | 1342 | return -1; |
588ccd73 SR |
1343 | } |
1344 | ||
00759c0e RD |
1345 | static void print_section_list(const char * const list[20]) |
1346 | { | |
1347 | const char *const *s = list; | |
1348 | ||
1349 | while (*s) { | |
1350 | fprintf(stderr, "%s", *s); | |
1351 | s++; | |
1352 | if (*s) | |
1353 | fprintf(stderr, ", "); | |
1354 | } | |
1355 | fprintf(stderr, "\n"); | |
1356 | } | |
1357 | ||
356ad538 QC |
1358 | static inline void get_pretty_name(int is_func, const char** name, const char** name_p) |
1359 | { | |
1360 | switch (is_func) { | |
1361 | case 0: *name = "variable"; *name_p = ""; break; | |
1362 | case 1: *name = "function"; *name_p = "()"; break; | |
1363 | default: *name = "(unknown reference)"; *name_p = ""; break; | |
1364 | } | |
1365 | } | |
1366 | ||
58fb0d4f | 1367 | /* |
b39927cf SR |
1368 | * Print a warning about a section mismatch. |
1369 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1370 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1371 | */ |
0d2a636e UKK |
1372 | static void report_sec_mismatch(const char *modname, |
1373 | const struct sectioncheck *mismatch, | |
bb66fc67 MY |
1374 | const char *fromsec, |
1375 | unsigned long long fromaddr, | |
1376 | const char *fromsym, | |
1377 | int from_is_func, | |
1378 | const char *tosec, const char *tosym, | |
1379 | int to_is_func) | |
588ccd73 SR |
1380 | { |
1381 | const char *from, *from_p; | |
1382 | const char *to, *to_p; | |
37ed19d5 AF |
1383 | char *prl_from; |
1384 | char *prl_to; | |
f666751a | 1385 | |
e5f95c8b SR |
1386 | sec_mismatch_count++; |
1387 | if (!sec_mismatch_verbose) | |
1388 | return; | |
1389 | ||
356ad538 QC |
1390 | get_pretty_name(from_is_func, &from, &from_p); |
1391 | get_pretty_name(to_is_func, &to, &to_p); | |
1392 | ||
7c0ac495 GU |
1393 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1394 | "to the %s %s:%s%s\n", | |
1395 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1396 | tosym, to_p); | |
588ccd73 | 1397 | |
0d2a636e | 1398 | switch (mismatch->mismatch) { |
bbd3f4fb | 1399 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1400 | prl_from = sec2annotation(fromsec); |
1401 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1402 | fprintf(stderr, |
f666751a | 1403 | "The function %s%s() references\n" |
588ccd73 SR |
1404 | "the %s %s%s%s.\n" |
1405 | "This is often because %s lacks a %s\n" | |
1406 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1407 | prl_from, fromsym, |
1408 | to, prl_to, tosym, to_p, | |
1409 | fromsym, prl_to, tosym); | |
1410 | free(prl_from); | |
1411 | free(prl_to); | |
588ccd73 | 1412 | break; |
bbd3f4fb | 1413 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1414 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1415 | fprintf(stderr, |
1416 | "The variable %s references\n" | |
1417 | "the %s %s%s%s\n" | |
1418 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1419 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1420 | "or name the variable:\n", |
37ed19d5 | 1421 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1422 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1423 | free(prl_to); |
588ccd73 | 1424 | break; |
58fb0d4f | 1425 | } |
bbd3f4fb | 1426 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1427 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1428 | fprintf(stderr, |
1429 | "The function %s() references a %s in an exit section.\n" | |
1430 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1431 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1432 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1433 | free(prl_to); | |
588ccd73 | 1434 | break; |
bbd3f4fb | 1435 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1436 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1437 | fprintf(stderr, |
1438 | "The variable %s references\n" | |
1439 | "the %s %s%s%s\n" | |
1440 | "If the reference is valid then annotate the\n" | |
1441 | "variable with __exit* (see linux/init.h) or " | |
1442 | "name the variable:\n", | |
37ed19d5 | 1443 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1444 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1445 | free(prl_to); |
588ccd73 SR |
1446 | break; |
1447 | } | |
bbd3f4fb UKK |
1448 | case XXXINIT_TO_SOME_INIT: |
1449 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1450 | prl_from = sec2annotation(fromsec); |
1451 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1452 | fprintf(stderr, |
1453 | "The %s %s%s%s references\n" | |
1454 | "a %s %s%s%s.\n" | |
1455 | "If %s is only used by %s then\n" | |
1456 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1457 | from, prl_from, fromsym, from_p, |
1458 | to, prl_to, tosym, to_p, | |
b1d2675a | 1459 | tosym, fromsym, tosym); |
37ed19d5 AF |
1460 | free(prl_from); |
1461 | free(prl_to); | |
588ccd73 | 1462 | break; |
bbd3f4fb | 1463 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1464 | prl_from = sec2annotation(fromsec); |
1465 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1466 | fprintf(stderr, |
1467 | "The %s %s%s%s references\n" | |
1468 | "a %s %s%s%s.\n" | |
1469 | "This is often seen when error handling " | |
1470 | "in the init function\n" | |
1471 | "uses functionality in the exit path.\n" | |
1472 | "The fix is often to remove the %sannotation of\n" | |
1473 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1474 | from, prl_from, fromsym, from_p, |
1475 | to, prl_to, tosym, to_p, | |
5003bab8 | 1476 | prl_to, tosym, to_p); |
37ed19d5 AF |
1477 | free(prl_from); |
1478 | free(prl_to); | |
588ccd73 | 1479 | break; |
bbd3f4fb | 1480 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1481 | prl_from = sec2annotation(fromsec); |
1482 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1483 | fprintf(stderr, |
1484 | "The %s %s%s%s references\n" | |
1485 | "a %s %s%s%s.\n" | |
1486 | "This is often seen when error handling " | |
1487 | "in the exit function\n" | |
1488 | "uses functionality in the init path.\n" | |
1489 | "The fix is often to remove the %sannotation of\n" | |
1490 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1491 | from, prl_from, fromsym, from_p, |
1492 | to, prl_to, tosym, to_p, | |
1493 | prl_to, tosym, to_p); | |
1494 | free(prl_from); | |
1495 | free(prl_to); | |
588ccd73 SR |
1496 | break; |
1497 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1498 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1499 | fprintf(stderr, |
1500 | "The symbol %s is exported and annotated %s\n" | |
1501 | "Fix this by removing the %sannotation of %s " | |
1502 | "or drop the export.\n", | |
37ed19d5 AF |
1503 | tosym, prl_to, prl_to, tosym); |
1504 | free(prl_to); | |
588ccd73 | 1505 | break; |
52dc0595 QC |
1506 | case EXTABLE_TO_NON_TEXT: |
1507 | fatal("There's a special handler for this mismatch type, " | |
1508 | "we should never get here."); | |
1509 | break; | |
588ccd73 SR |
1510 | } |
1511 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1512 | } |
1513 | ||
644e8f14 QC |
1514 | static void default_mismatch_handler(const char *modname, struct elf_info *elf, |
1515 | const struct sectioncheck* const mismatch, | |
1516 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
58fb0d4f SR |
1517 | { |
1518 | const char *tosec; | |
644e8f14 QC |
1519 | Elf_Sym *to; |
1520 | Elf_Sym *from; | |
1521 | const char *tosym; | |
1522 | const char *fromsym; | |
58fb0d4f | 1523 | |
644e8f14 QC |
1524 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1525 | fromsym = sym_name(elf, from); | |
644e8f14 QC |
1526 | |
1527 | if (!strncmp(fromsym, "reference___initcall", | |
1528 | sizeof("reference___initcall")-1)) | |
1529 | return; | |
1530 | ||
c7a65e06 QC |
1531 | tosec = sec_name(elf, get_secindex(elf, sym)); |
1532 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1533 | tosym = sym_name(elf, to); | |
1534 | ||
644e8f14 QC |
1535 | /* check whitelist - we may ignore it */ |
1536 | if (secref_whitelist(mismatch, | |
1537 | fromsec, fromsym, tosec, tosym)) { | |
1538 | report_sec_mismatch(modname, mismatch, | |
1539 | fromsec, r->r_offset, fromsym, | |
1540 | is_function(from), tosec, tosym, | |
1541 | is_function(to)); | |
1542 | } | |
1543 | } | |
1544 | ||
52dc0595 QC |
1545 | static int is_executable_section(struct elf_info* elf, unsigned int section_index) |
1546 | { | |
1547 | if (section_index > elf->num_sections) | |
1548 | fatal("section_index is outside elf->num_sections!\n"); | |
1549 | ||
1550 | return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR); | |
1551 | } | |
1552 | ||
1553 | /* | |
1554 | * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size() | |
1555 | * to know the sizeof(struct exception_table_entry) for the target architecture. | |
1556 | */ | |
1557 | static unsigned int extable_entry_size = 0; | |
e84048aa | 1558 | static void find_extable_entry_size(const char* const sec, const Elf_Rela* r) |
52dc0595 QC |
1559 | { |
1560 | /* | |
1561 | * If we're currently checking the second relocation within __ex_table, | |
1562 | * that relocation offset tells us the offsetof(struct | |
1563 | * exception_table_entry, fixup) which is equal to sizeof(struct | |
1564 | * exception_table_entry) divided by two. We use that to our advantage | |
1565 | * since there's no portable way to get that size as every architecture | |
1566 | * seems to go with different sized types. Not pretty but better than | |
1567 | * hard-coding the size for every architecture.. | |
1568 | */ | |
e84048aa | 1569 | if (!extable_entry_size) |
52dc0595 QC |
1570 | extable_entry_size = r->r_offset * 2; |
1571 | } | |
e84048aa | 1572 | |
52dc0595 QC |
1573 | static inline bool is_extable_fault_address(Elf_Rela *r) |
1574 | { | |
d3df4de7 QC |
1575 | /* |
1576 | * extable_entry_size is only discovered after we've handled the | |
1577 | * _second_ relocation in __ex_table, so only abort when we're not | |
1578 | * handling the first reloc and extable_entry_size is zero. | |
1579 | */ | |
1580 | if (r->r_offset && extable_entry_size == 0) | |
52dc0595 QC |
1581 | fatal("extable_entry size hasn't been discovered!\n"); |
1582 | ||
1583 | return ((r->r_offset == 0) || | |
1584 | (r->r_offset % extable_entry_size == 0)); | |
1585 | } | |
1586 | ||
e84048aa QC |
1587 | #define is_second_extable_reloc(Start, Cur, Sec) \ |
1588 | (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0)) | |
1589 | ||
52dc0595 QC |
1590 | static void report_extable_warnings(const char* modname, struct elf_info* elf, |
1591 | const struct sectioncheck* const mismatch, | |
1592 | Elf_Rela* r, Elf_Sym* sym, | |
1593 | const char* fromsec, const char* tosec) | |
1594 | { | |
1595 | Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec); | |
1596 | const char* fromsym_name = sym_name(elf, fromsym); | |
1597 | Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym); | |
1598 | const char* tosym_name = sym_name(elf, tosym); | |
1599 | const char* from_pretty_name; | |
1600 | const char* from_pretty_name_p; | |
1601 | const char* to_pretty_name; | |
1602 | const char* to_pretty_name_p; | |
1603 | ||
1604 | get_pretty_name(is_function(fromsym), | |
1605 | &from_pretty_name, &from_pretty_name_p); | |
1606 | get_pretty_name(is_function(tosym), | |
1607 | &to_pretty_name, &to_pretty_name_p); | |
1608 | ||
1609 | warn("%s(%s+0x%lx): Section mismatch in reference" | |
1610 | " from the %s %s%s to the %s %s:%s%s\n", | |
1611 | modname, fromsec, (long)r->r_offset, from_pretty_name, | |
1612 | fromsym_name, from_pretty_name_p, | |
1613 | to_pretty_name, tosec, tosym_name, to_pretty_name_p); | |
1614 | ||
1615 | if (!match(tosec, mismatch->bad_tosec) && | |
1616 | is_executable_section(elf, get_secindex(elf, sym))) | |
1617 | fprintf(stderr, | |
1618 | "The relocation at %s+0x%lx references\n" | |
1619 | "section \"%s\" which is not in the list of\n" | |
1620 | "authorized sections. If you're adding a new section\n" | |
1621 | "and/or if this reference is valid, add \"%s\" to the\n" | |
1622 | "list of authorized sections to jump to on fault.\n" | |
1623 | "This can be achieved by adding \"%s\" to \n" | |
1624 | "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n", | |
1625 | fromsec, (long)r->r_offset, tosec, tosec, tosec); | |
1626 | } | |
1627 | ||
1628 | static void extable_mismatch_handler(const char* modname, struct elf_info *elf, | |
1629 | const struct sectioncheck* const mismatch, | |
1630 | Elf_Rela* r, Elf_Sym* sym, | |
1631 | const char *fromsec) | |
1632 | { | |
1633 | const char* tosec = sec_name(elf, get_secindex(elf, sym)); | |
1634 | ||
1635 | sec_mismatch_count++; | |
1636 | ||
1637 | if (sec_mismatch_verbose) | |
1638 | report_extable_warnings(modname, elf, mismatch, r, sym, | |
1639 | fromsec, tosec); | |
1640 | ||
1641 | if (match(tosec, mismatch->bad_tosec)) | |
1642 | fatal("The relocation at %s+0x%lx references\n" | |
1643 | "section \"%s\" which is black-listed.\n" | |
1644 | "Something is seriously wrong and should be fixed.\n" | |
1645 | "You might get more information about where this is\n" | |
1646 | "coming from by using scripts/check_extable.sh %s\n", | |
1647 | fromsec, (long)r->r_offset, tosec, modname); | |
1648 | else if (!is_executable_section(elf, get_secindex(elf, sym))) { | |
1649 | if (is_extable_fault_address(r)) | |
1650 | fatal("The relocation at %s+0x%lx references\n" | |
1651 | "section \"%s\" which is not executable, IOW\n" | |
1652 | "it is not possible for the kernel to fault\n" | |
1653 | "at that address. Something is seriously wrong\n" | |
1654 | "and should be fixed.\n", | |
1655 | fromsec, (long)r->r_offset, tosec); | |
1656 | else | |
1657 | fatal("The relocation at %s+0x%lx references\n" | |
1658 | "section \"%s\" which is not executable, IOW\n" | |
1659 | "the kernel will fault if it ever tries to\n" | |
1660 | "jump to it. Something is seriously wrong\n" | |
1661 | "and should be fixed.\n", | |
1662 | fromsec, (long)r->r_offset, tosec); | |
1663 | } | |
1664 | } | |
1665 | ||
644e8f14 QC |
1666 | static void check_section_mismatch(const char *modname, struct elf_info *elf, |
1667 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1668 | { | |
1669 | const char *tosec = sec_name(elf, get_secindex(elf, sym));; | |
1670 | const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec); | |
1671 | ||
0d2a636e | 1672 | if (mismatch) { |
644e8f14 QC |
1673 | if (mismatch->handler) |
1674 | mismatch->handler(modname, elf, mismatch, | |
1675 | r, sym, fromsec); | |
1676 | else | |
1677 | default_mismatch_handler(modname, elf, mismatch, | |
1678 | r, sym, fromsec); | |
b39927cf SR |
1679 | } |
1680 | } | |
1681 | ||
ae4ac123 | 1682 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1683 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1684 | { |
1685 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1686 | int section = sechdr->sh_info; |
ae4ac123 AN |
1687 | |
1688 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1689 | r->r_offset; |
ae4ac123 AN |
1690 | } |
1691 | ||
5b24c071 | 1692 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1693 | { |
1694 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1695 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1696 | |
1697 | switch (r_typ) { | |
1698 | case R_386_32: | |
1699 | r->r_addend = TO_NATIVE(*location); | |
1700 | break; | |
1701 | case R_386_PC32: | |
1702 | r->r_addend = TO_NATIVE(*location) + 4; | |
1703 | /* For CONFIG_RELOCATABLE=y */ | |
1704 | if (elf->hdr->e_type == ET_EXEC) | |
1705 | r->r_addend += r->r_offset; | |
1706 | break; | |
1707 | } | |
1708 | return 0; | |
1709 | } | |
1710 | ||
6e2e340b TL |
1711 | #ifndef R_ARM_CALL |
1712 | #define R_ARM_CALL 28 | |
1713 | #endif | |
1714 | #ifndef R_ARM_JUMP24 | |
1715 | #define R_ARM_JUMP24 29 | |
1716 | #endif | |
1717 | ||
c9698e5c DL |
1718 | #ifndef R_ARM_THM_CALL |
1719 | #define R_ARM_THM_CALL 10 | |
1720 | #endif | |
1721 | #ifndef R_ARM_THM_JUMP24 | |
1722 | #define R_ARM_THM_JUMP24 30 | |
1723 | #endif | |
1724 | #ifndef R_ARM_THM_JUMP19 | |
1725 | #define R_ARM_THM_JUMP19 51 | |
1726 | #endif | |
1727 | ||
5b24c071 | 1728 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1729 | { |
1730 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1731 | ||
1732 | switch (r_typ) { | |
1733 | case R_ARM_ABS32: | |
1734 | /* From ARM ABI: (S + A) | T */ | |
df578e7d | 1735 | r->r_addend = (int)(long) |
bb66fc67 | 1736 | (elf->symtab_start + ELF_R_SYM(r->r_info)); |
56a974fa SR |
1737 | break; |
1738 | case R_ARM_PC24: | |
6e2e340b TL |
1739 | case R_ARM_CALL: |
1740 | case R_ARM_JUMP24: | |
c9698e5c DL |
1741 | case R_ARM_THM_CALL: |
1742 | case R_ARM_THM_JUMP24: | |
1743 | case R_ARM_THM_JUMP19: | |
56a974fa | 1744 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1745 | r->r_addend = (int)(long)(elf->hdr + |
bb66fc67 MY |
1746 | sechdr->sh_offset + |
1747 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1748 | break; |
1749 | default: | |
1750 | return 1; | |
1751 | } | |
1752 | return 0; | |
1753 | } | |
1754 | ||
5b24c071 | 1755 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1756 | { |
1757 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1758 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1759 | unsigned int inst; |
1760 | ||
1761 | if (r_typ == R_MIPS_HI16) | |
1762 | return 1; /* skip this */ | |
1763 | inst = TO_NATIVE(*location); | |
1764 | switch (r_typ) { | |
1765 | case R_MIPS_LO16: | |
1766 | r->r_addend = inst & 0xffff; | |
1767 | break; | |
1768 | case R_MIPS_26: | |
1769 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1770 | break; | |
1771 | case R_MIPS_32: | |
1772 | r->r_addend = inst; | |
1773 | break; | |
1774 | } | |
1775 | return 0; | |
1776 | } | |
1777 | ||
5b24c071 | 1778 | static void section_rela(const char *modname, struct elf_info *elf, |
bb66fc67 | 1779 | Elf_Shdr *sechdr) |
5b24c071 SR |
1780 | { |
1781 | Elf_Sym *sym; | |
1782 | Elf_Rela *rela; | |
1783 | Elf_Rela r; | |
1784 | unsigned int r_sym; | |
1785 | const char *fromsec; | |
5b24c071 | 1786 | |
ff13f926 | 1787 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1788 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1789 | ||
ff13f926 | 1790 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1791 | fromsec += strlen(".rela"); |
1792 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1793 | if (match(fromsec, section_white_list)) |
5b24c071 | 1794 | return; |
e241a630 | 1795 | |
5b24c071 SR |
1796 | for (rela = start; rela < stop; rela++) { |
1797 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1798 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1799 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1800 | unsigned int r_typ; |
1801 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1802 | r_sym = TO_NATIVE(r_sym); | |
1803 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1804 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1805 | } else { | |
1806 | r.r_info = TO_NATIVE(rela->r_info); | |
1807 | r_sym = ELF_R_SYM(r.r_info); | |
1808 | } | |
1809 | #else | |
1810 | r.r_info = TO_NATIVE(rela->r_info); | |
1811 | r_sym = ELF_R_SYM(r.r_info); | |
1812 | #endif | |
1813 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1814 | sym = elf->symtab_start + r_sym; | |
1815 | /* Skip special sections */ | |
1ce53adf | 1816 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1817 | continue; |
e84048aa QC |
1818 | if (is_second_extable_reloc(start, rela, fromsec)) |
1819 | find_extable_entry_size(fromsec, &r); | |
58fb0d4f | 1820 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1821 | } |
1822 | } | |
1823 | ||
1824 | static void section_rel(const char *modname, struct elf_info *elf, | |
bb66fc67 | 1825 | Elf_Shdr *sechdr) |
5b24c071 SR |
1826 | { |
1827 | Elf_Sym *sym; | |
1828 | Elf_Rel *rel; | |
1829 | Elf_Rela r; | |
1830 | unsigned int r_sym; | |
1831 | const char *fromsec; | |
5b24c071 | 1832 | |
ff13f926 | 1833 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1834 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1835 | ||
ff13f926 | 1836 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1837 | fromsec += strlen(".rel"); |
1838 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1839 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1840 | return; |
1841 | ||
1842 | for (rel = start; rel < stop; rel++) { | |
1843 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1844 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1845 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1846 | unsigned int r_typ; |
1847 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1848 | r_sym = TO_NATIVE(r_sym); | |
1849 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1850 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1851 | } else { | |
1852 | r.r_info = TO_NATIVE(rel->r_info); | |
1853 | r_sym = ELF_R_SYM(r.r_info); | |
1854 | } | |
1855 | #else | |
1856 | r.r_info = TO_NATIVE(rel->r_info); | |
1857 | r_sym = ELF_R_SYM(r.r_info); | |
1858 | #endif | |
1859 | r.r_addend = 0; | |
ff13f926 | 1860 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1861 | case EM_386: |
1862 | if (addend_386_rel(elf, sechdr, &r)) | |
1863 | continue; | |
1864 | break; | |
1865 | case EM_ARM: | |
1866 | if (addend_arm_rel(elf, sechdr, &r)) | |
1867 | continue; | |
1868 | break; | |
1869 | case EM_MIPS: | |
1870 | if (addend_mips_rel(elf, sechdr, &r)) | |
1871 | continue; | |
1872 | break; | |
1873 | } | |
1874 | sym = elf->symtab_start + r_sym; | |
1875 | /* Skip special sections */ | |
1ce53adf | 1876 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1877 | continue; |
e84048aa QC |
1878 | if (is_second_extable_reloc(start, rel, fromsec)) |
1879 | find_extable_entry_size(fromsec, &r); | |
58fb0d4f | 1880 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1881 | } |
1882 | } | |
1883 | ||
b39927cf SR |
1884 | /** |
1885 | * A module includes a number of sections that are discarded | |
1886 | * either when loaded or when used as built-in. | |
1887 | * For loaded modules all functions marked __init and all data | |
b595076a | 1888 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1889 | * Likewise for modules used built-in the sections marked __exit |
1890 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1891 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1892 | * The check_sec_ref() function traverses all relocation records |
1893 | * to find all references to a section that reference a section that will | |
1894 | * be discarded and warns about it. | |
1895 | **/ | |
1896 | static void check_sec_ref(struct module *mod, const char *modname, | |
bb66fc67 | 1897 | struct elf_info *elf) |
b39927cf SR |
1898 | { |
1899 | int i; | |
b39927cf | 1900 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1901 | |
b39927cf | 1902 | /* Walk through all sections */ |
1ce53adf | 1903 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1904 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1905 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1906 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1907 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1908 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1909 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1910 | } |
1911 | } | |
1912 | ||
7d02b490 AK |
1913 | static char *remove_dot(char *s) |
1914 | { | |
fcd38ed0 | 1915 | size_t n = strcspn(s, "."); |
7d02b490 | 1916 | |
fcd38ed0 MN |
1917 | if (n && s[n]) { |
1918 | size_t m = strspn(s + n + 1, "0123456789"); | |
1919 | if (m && (s[n + m] == '.' || s[n + m] == 0)) | |
7d02b490 AK |
1920 | s[n] = 0; |
1921 | } | |
1922 | return s; | |
1923 | } | |
1924 | ||
5c3ead8c | 1925 | static void read_symbols(char *modname) |
1da177e4 LT |
1926 | { |
1927 | const char *symname; | |
1928 | char *version; | |
b817f6fe | 1929 | char *license; |
1da177e4 LT |
1930 | struct module *mod; |
1931 | struct elf_info info = { }; | |
1932 | Elf_Sym *sym; | |
1933 | ||
85bd2fdd SR |
1934 | if (!parse_elf(&info, modname)) |
1935 | return; | |
1da177e4 LT |
1936 | |
1937 | mod = new_module(modname); | |
1938 | ||
1939 | /* When there's no vmlinux, don't print warnings about | |
1940 | * unresolved symbols (since there'll be too many ;) */ | |
1941 | if (is_vmlinux(modname)) { | |
1da177e4 | 1942 | have_vmlinux = 1; |
1da177e4 LT |
1943 | mod->skip = 1; |
1944 | } | |
1945 | ||
b817f6fe | 1946 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1947 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1948 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1949 | "see include/linux/module.h for " | |
1950 | "more information\n", modname); | |
b817f6fe SR |
1951 | while (license) { |
1952 | if (license_is_gpl_compatible(license)) | |
1953 | mod->gpl_compatible = 1; | |
1954 | else { | |
1955 | mod->gpl_compatible = 0; | |
1956 | break; | |
1957 | } | |
1958 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1959 | "license", license); | |
1960 | } | |
1961 | ||
1da177e4 | 1962 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
7d02b490 | 1963 | symname = remove_dot(info.strtab + sym->st_name); |
1da177e4 LT |
1964 | |
1965 | handle_modversions(mod, &info, sym, symname); | |
1966 | handle_moddevtable(mod, &info, sym, symname); | |
1967 | } | |
d1f25e66 | 1968 | if (!is_vmlinux(modname) || |
10668220 SR |
1969 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1970 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1971 | |
1972 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1973 | if (version) | |
1974 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1975 | version - (char *)info.hdr); | |
1976 | if (version || (all_versions && !is_vmlinux(modname))) | |
1977 | get_src_version(modname, mod->srcversion, | |
1978 | sizeof(mod->srcversion)-1); | |
1979 | ||
1980 | parse_elf_finish(&info); | |
1981 | ||
8c8ef42a | 1982 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1983 | * never passed as an argument to an exported function, so |
1984 | * the automatic versioning doesn't pick it up, but it's really | |
1985 | * important anyhow */ | |
1986 | if (modversions) | |
8c8ef42a | 1987 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1988 | } |
1989 | ||
712f9b46 RR |
1990 | static void read_symbols_from_files(const char *filename) |
1991 | { | |
1992 | FILE *in = stdin; | |
1993 | char fname[PATH_MAX]; | |
1994 | ||
1995 | if (strcmp(filename, "-") != 0) { | |
1996 | in = fopen(filename, "r"); | |
1997 | if (!in) | |
1998 | fatal("Can't open filenames file %s: %m", filename); | |
1999 | } | |
2000 | ||
2001 | while (fgets(fname, PATH_MAX, in) != NULL) { | |
2002 | if (strends(fname, "\n")) | |
2003 | fname[strlen(fname)-1] = '\0'; | |
2004 | read_symbols(fname); | |
2005 | } | |
2006 | ||
2007 | if (in != stdin) | |
2008 | fclose(in); | |
2009 | } | |
2010 | ||
1da177e4 LT |
2011 | #define SZ 500 |
2012 | ||
2013 | /* We first write the generated file into memory using the | |
2014 | * following helper, then compare to the file on disk and | |
2015 | * only update the later if anything changed */ | |
2016 | ||
5c3ead8c SR |
2017 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
2018 | const char *fmt, ...) | |
1da177e4 LT |
2019 | { |
2020 | char tmp[SZ]; | |
2021 | int len; | |
2022 | va_list ap; | |
62070fa4 | 2023 | |
1da177e4 LT |
2024 | va_start(ap, fmt); |
2025 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 2026 | buf_write(buf, tmp, len); |
1da177e4 LT |
2027 | va_end(ap); |
2028 | } | |
2029 | ||
5c3ead8c | 2030 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
2031 | { |
2032 | if (buf->size - buf->pos < len) { | |
7670f023 | 2033 | buf->size += len + SZ; |
1da177e4 LT |
2034 | buf->p = realloc(buf->p, buf->size); |
2035 | } | |
2036 | strncpy(buf->p + buf->pos, s, len); | |
2037 | buf->pos += len; | |
2038 | } | |
2039 | ||
c96fca21 SR |
2040 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
2041 | { | |
2042 | const char *e = is_vmlinux(m) ?"":".ko"; | |
2043 | ||
2044 | switch (exp) { | |
2045 | case export_gpl: | |
2046 | fatal("modpost: GPL-incompatible module %s%s " | |
2047 | "uses GPL-only symbol '%s'\n", m, e, s); | |
2048 | break; | |
2049 | case export_unused_gpl: | |
2050 | fatal("modpost: GPL-incompatible module %s%s " | |
2051 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
2052 | break; | |
2053 | case export_gpl_future: | |
2054 | warn("modpost: GPL-incompatible module %s%s " | |
2055 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
2056 | break; | |
2057 | case export_plain: | |
2058 | case export_unused: | |
2059 | case export_unknown: | |
2060 | /* ignore */ | |
2061 | break; | |
2062 | } | |
2063 | } | |
2064 | ||
df578e7d | 2065 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
2066 | { |
2067 | const char *e = is_vmlinux(m) ?"":".ko"; | |
2068 | ||
2069 | switch (exp) { | |
2070 | case export_unused: | |
2071 | case export_unused_gpl: | |
2072 | warn("modpost: module %s%s " | |
2073 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
2074 | break; | |
2075 | default: | |
2076 | /* ignore */ | |
2077 | break; | |
2078 | } | |
2079 | } | |
2080 | ||
2081 | static void check_exports(struct module *mod) | |
b817f6fe SR |
2082 | { |
2083 | struct symbol *s, *exp; | |
2084 | ||
2085 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 2086 | const char *basename; |
b817f6fe SR |
2087 | exp = find_symbol(s->name); |
2088 | if (!exp || exp->module == mod) | |
2089 | continue; | |
6449bd62 | 2090 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
2091 | if (basename) |
2092 | basename++; | |
c96fca21 SR |
2093 | else |
2094 | basename = mod->name; | |
2095 | if (!mod->gpl_compatible) | |
2096 | check_for_gpl_usage(exp->export, basename, exp->name); | |
2097 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 2098 | } |
b817f6fe SR |
2099 | } |
2100 | ||
5c3ead8c SR |
2101 | /** |
2102 | * Header for the generated file | |
2103 | **/ | |
2104 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
2105 | { |
2106 | buf_printf(b, "#include <linux/module.h>\n"); | |
2107 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
2108 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
2109 | buf_printf(b, "\n"); | |
2110 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
2111 | buf_printf(b, "\n"); | |
e0f244c6 | 2112 | buf_printf(b, "__visible struct module __this_module\n"); |
1da177e4 | 2113 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
3c7ec94d | 2114 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 2115 | if (mod->has_init) |
3c7ec94d | 2116 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
2117 | if (mod->has_cleanup) |
2118 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 2119 | "\t.exit = cleanup_module,\n" |
1da177e4 | 2120 | "#endif\n"); |
3c7ec94d | 2121 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
2122 | buf_printf(b, "};\n"); |
2123 | } | |
2124 | ||
2449b8ba BH |
2125 | static void add_intree_flag(struct buffer *b, int is_intree) |
2126 | { | |
2127 | if (is_intree) | |
2128 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
2129 | } | |
2130 | ||
5c725138 | 2131 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
2132 | { |
2133 | static const char *staging_dir = "drivers/staging"; | |
2134 | ||
2135 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
2136 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
2137 | } | |
2138 | ||
5cfb203a TI |
2139 | /* In kernel, this size is defined in linux/module.h; |
2140 | * here we use Elf_Addr instead of long for covering cross-compile | |
2141 | */ | |
2142 | #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr)) | |
2143 | ||
5c3ead8c SR |
2144 | /** |
2145 | * Record CRCs for unresolved symbols | |
2146 | **/ | |
c53ddacd | 2147 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
2148 | { |
2149 | struct symbol *s, *exp; | |
c53ddacd | 2150 | int err = 0; |
1da177e4 LT |
2151 | |
2152 | for (s = mod->unres; s; s = s->next) { | |
2153 | exp = find_symbol(s->name); | |
2154 | if (!exp || exp->module == mod) { | |
c53ddacd | 2155 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
2156 | if (warn_unresolved) { |
2157 | warn("\"%s\" [%s.ko] undefined!\n", | |
2158 | s->name, mod->name); | |
2159 | } else { | |
2160 | merror("\"%s\" [%s.ko] undefined!\n", | |
bb66fc67 | 2161 | s->name, mod->name); |
2a116659 MW |
2162 | err = 1; |
2163 | } | |
c53ddacd | 2164 | } |
1da177e4 LT |
2165 | continue; |
2166 | } | |
2167 | s->module = exp->module; | |
2168 | s->crc_valid = exp->crc_valid; | |
2169 | s->crc = exp->crc; | |
2170 | } | |
2171 | ||
2172 | if (!modversions) | |
c53ddacd | 2173 | return err; |
1da177e4 LT |
2174 | |
2175 | buf_printf(b, "\n"); | |
2176 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 2177 | buf_printf(b, "__used\n"); |
1da177e4 LT |
2178 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
2179 | ||
2180 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 2181 | if (!s->module) |
1da177e4 | 2182 | continue; |
1da177e4 | 2183 | if (!s->crc_valid) { |
cb80514d | 2184 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
2185 | s->name, mod->name); |
2186 | continue; | |
2187 | } | |
5cfb203a TI |
2188 | if (strlen(s->name) >= MODULE_NAME_LEN) { |
2189 | merror("too long symbol \"%s\" [%s.ko]\n", | |
2190 | s->name, mod->name); | |
2191 | err = 1; | |
2192 | break; | |
2193 | } | |
a53a11f3 | 2194 | buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", |
a4b6a77b | 2195 | s->crc, s->name); |
1da177e4 LT |
2196 | } |
2197 | ||
2198 | buf_printf(b, "};\n"); | |
c53ddacd KK |
2199 | |
2200 | return err; | |
1da177e4 LT |
2201 | } |
2202 | ||
5c3ead8c SR |
2203 | static void add_depends(struct buffer *b, struct module *mod, |
2204 | struct module *modules) | |
1da177e4 LT |
2205 | { |
2206 | struct symbol *s; | |
2207 | struct module *m; | |
2208 | int first = 1; | |
2209 | ||
df578e7d | 2210 | for (m = modules; m; m = m->next) |
1da177e4 | 2211 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
2212 | |
2213 | buf_printf(b, "\n"); | |
2214 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 2215 | buf_printf(b, "__used\n"); |
1da177e4 LT |
2216 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
2217 | buf_printf(b, "\"depends="); | |
2218 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 2219 | const char *p; |
1da177e4 LT |
2220 | if (!s->module) |
2221 | continue; | |
2222 | ||
2223 | if (s->module->seen) | |
2224 | continue; | |
2225 | ||
2226 | s->module->seen = 1; | |
df578e7d SR |
2227 | p = strrchr(s->module->name, '/'); |
2228 | if (p) | |
a61b2dfd SR |
2229 | p++; |
2230 | else | |
2231 | p = s->module->name; | |
2232 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
2233 | first = 0; |
2234 | } | |
2235 | buf_printf(b, "\";\n"); | |
2236 | } | |
2237 | ||
5c3ead8c | 2238 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
2239 | { |
2240 | if (mod->srcversion[0]) { | |
2241 | buf_printf(b, "\n"); | |
2242 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
2243 | mod->srcversion); | |
2244 | } | |
2245 | } | |
2246 | ||
5c3ead8c | 2247 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
2248 | { |
2249 | char *tmp; | |
2250 | FILE *file; | |
2251 | struct stat st; | |
2252 | ||
2253 | file = fopen(fname, "r"); | |
2254 | if (!file) | |
2255 | goto write; | |
2256 | ||
2257 | if (fstat(fileno(file), &st) < 0) | |
2258 | goto close_write; | |
2259 | ||
2260 | if (st.st_size != b->pos) | |
2261 | goto close_write; | |
2262 | ||
2263 | tmp = NOFAIL(malloc(b->pos)); | |
2264 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
2265 | goto free_write; | |
2266 | ||
2267 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2268 | goto free_write; | |
2269 | ||
2270 | free(tmp); | |
2271 | fclose(file); | |
2272 | return; | |
2273 | ||
2274 | free_write: | |
2275 | free(tmp); | |
2276 | close_write: | |
2277 | fclose(file); | |
2278 | write: | |
2279 | file = fopen(fname, "w"); | |
2280 | if (!file) { | |
2281 | perror(fname); | |
2282 | exit(1); | |
2283 | } | |
2284 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2285 | perror(fname); | |
2286 | exit(1); | |
2287 | } | |
2288 | fclose(file); | |
2289 | } | |
2290 | ||
bd5cbced | 2291 | /* parse Module.symvers file. line format: |
534b89a9 | 2292 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2293 | **/ |
040fcc81 | 2294 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2295 | { |
2296 | unsigned long size, pos = 0; | |
2297 | void *file = grab_file(fname, &size); | |
2298 | char *line; | |
2299 | ||
df578e7d | 2300 | if (!file) |
1da177e4 LT |
2301 | /* No symbol versions, silently ignore */ |
2302 | return; | |
2303 | ||
2304 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2305 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2306 | unsigned int crc; |
2307 | struct module *mod; | |
040fcc81 | 2308 | struct symbol *s; |
1da177e4 LT |
2309 | |
2310 | if (!(symname = strchr(line, '\t'))) | |
2311 | goto fail; | |
2312 | *symname++ = '\0'; | |
2313 | if (!(modname = strchr(symname, '\t'))) | |
2314 | goto fail; | |
2315 | *modname++ = '\0'; | |
9ac545b0 | 2316 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2317 | *export++ = '\0'; |
534b89a9 SR |
2318 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2319 | *end = '\0'; | |
1da177e4 LT |
2320 | crc = strtoul(line, &d, 16); |
2321 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2322 | goto fail; | |
df578e7d SR |
2323 | mod = find_module(modname); |
2324 | if (!mod) { | |
2325 | if (is_vmlinux(modname)) | |
1da177e4 | 2326 | have_vmlinux = 1; |
0fa3a88c | 2327 | mod = new_module(modname); |
1da177e4 LT |
2328 | mod->skip = 1; |
2329 | } | |
bd5cbced | 2330 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2331 | s->kernel = kernel; |
2332 | s->preloaded = 1; | |
bd5cbced | 2333 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 | 2334 | } |
2ee41e62 | 2335 | release_file(file, size); |
1da177e4 LT |
2336 | return; |
2337 | fail: | |
2ee41e62 | 2338 | release_file(file, size); |
1da177e4 LT |
2339 | fatal("parse error in symbol dump file\n"); |
2340 | } | |
2341 | ||
040fcc81 SR |
2342 | /* For normal builds always dump all symbols. |
2343 | * For external modules only dump symbols | |
2344 | * that are not read from kernel Module.symvers. | |
2345 | **/ | |
2346 | static int dump_sym(struct symbol *sym) | |
2347 | { | |
2348 | if (!external_module) | |
2349 | return 1; | |
2350 | if (sym->vmlinux || sym->kernel) | |
2351 | return 0; | |
2352 | return 1; | |
2353 | } | |
62070fa4 | 2354 | |
5c3ead8c | 2355 | static void write_dump(const char *fname) |
1da177e4 LT |
2356 | { |
2357 | struct buffer buf = { }; | |
2358 | struct symbol *symbol; | |
2359 | int n; | |
2360 | ||
2361 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2362 | symbol = symbolhash[n]; | |
2363 | while (symbol) { | |
040fcc81 | 2364 | if (dump_sym(symbol)) |
bd5cbced | 2365 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2366 | symbol->crc, symbol->name, |
bd5cbced RP |
2367 | symbol->module->name, |
2368 | export_str(symbol->export)); | |
1da177e4 LT |
2369 | symbol = symbol->next; |
2370 | } | |
2371 | } | |
2372 | write_if_changed(&buf, fname); | |
2373 | } | |
2374 | ||
2d04b5ae RH |
2375 | struct ext_sym_list { |
2376 | struct ext_sym_list *next; | |
2377 | const char *file; | |
2378 | }; | |
2379 | ||
5c3ead8c | 2380 | int main(int argc, char **argv) |
1da177e4 LT |
2381 | { |
2382 | struct module *mod; | |
2383 | struct buffer buf = { }; | |
040fcc81 | 2384 | char *kernel_read = NULL, *module_read = NULL; |
712f9b46 | 2385 | char *dump_write = NULL, *files_source = NULL; |
1da177e4 | 2386 | int opt; |
c53ddacd | 2387 | int err; |
2d04b5ae RH |
2388 | struct ext_sym_list *extsym_iter; |
2389 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2390 | |
47490ec1 | 2391 | while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:E")) != -1) { |
df578e7d SR |
2392 | switch (opt) { |
2393 | case 'i': | |
2394 | kernel_read = optarg; | |
2395 | break; | |
2396 | case 'I': | |
2397 | module_read = optarg; | |
2398 | external_module = 1; | |
2399 | break; | |
2d04b5ae RH |
2400 | case 'e': |
2401 | external_module = 1; | |
2402 | extsym_iter = | |
2403 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2404 | extsym_iter->next = extsym_start; | |
2405 | extsym_iter->file = optarg; | |
2406 | extsym_start = extsym_iter; | |
2407 | break; | |
df578e7d SR |
2408 | case 'm': |
2409 | modversions = 1; | |
2410 | break; | |
eed380f3 GR |
2411 | case 'n': |
2412 | ignore_missing_files = 1; | |
2413 | break; | |
df578e7d SR |
2414 | case 'o': |
2415 | dump_write = optarg; | |
2416 | break; | |
2417 | case 'a': | |
2418 | all_versions = 1; | |
2419 | break; | |
2420 | case 's': | |
2421 | vmlinux_section_warnings = 0; | |
2422 | break; | |
588ccd73 SR |
2423 | case 'S': |
2424 | sec_mismatch_verbose = 0; | |
2425 | break; | |
712f9b46 RR |
2426 | case 'T': |
2427 | files_source = optarg; | |
2428 | break; | |
df578e7d SR |
2429 | case 'w': |
2430 | warn_unresolved = 1; | |
2431 | break; | |
47490ec1 NB |
2432 | case 'E': |
2433 | sec_mismatch_fatal = 1; | |
2434 | break; | |
df578e7d SR |
2435 | default: |
2436 | exit(1); | |
1da177e4 LT |
2437 | } |
2438 | } | |
2439 | ||
040fcc81 SR |
2440 | if (kernel_read) |
2441 | read_dump(kernel_read, 1); | |
2442 | if (module_read) | |
2443 | read_dump(module_read, 0); | |
2d04b5ae RH |
2444 | while (extsym_start) { |
2445 | read_dump(extsym_start->file, 0); | |
2446 | extsym_iter = extsym_start->next; | |
2447 | free(extsym_start); | |
2448 | extsym_start = extsym_iter; | |
2449 | } | |
1da177e4 | 2450 | |
df578e7d | 2451 | while (optind < argc) |
1da177e4 | 2452 | read_symbols(argv[optind++]); |
1da177e4 | 2453 | |
712f9b46 RR |
2454 | if (files_source) |
2455 | read_symbols_from_files(files_source); | |
2456 | ||
b817f6fe SR |
2457 | for (mod = modules; mod; mod = mod->next) { |
2458 | if (mod->skip) | |
2459 | continue; | |
c96fca21 | 2460 | check_exports(mod); |
b817f6fe SR |
2461 | } |
2462 | ||
c53ddacd KK |
2463 | err = 0; |
2464 | ||
1da177e4 | 2465 | for (mod = modules; mod; mod = mod->next) { |
d93e1719 | 2466 | char fname[PATH_MAX]; |
666ab414 | 2467 | |
1da177e4 LT |
2468 | if (mod->skip) |
2469 | continue; | |
2470 | ||
2471 | buf.pos = 0; | |
2472 | ||
2473 | add_header(&buf, mod); | |
2449b8ba | 2474 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2475 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2476 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2477 | add_depends(&buf, mod, modules); |
2478 | add_moddevtable(&buf, mod); | |
2479 | add_srcversion(&buf, mod); | |
2480 | ||
2481 | sprintf(fname, "%s.mod.c", mod->name); | |
2482 | write_if_changed(&buf, fname); | |
2483 | } | |
1da177e4 LT |
2484 | if (dump_write) |
2485 | write_dump(dump_write); | |
47490ec1 NB |
2486 | if (sec_mismatch_count) { |
2487 | if (!sec_mismatch_verbose) { | |
2488 | warn("modpost: Found %d section mismatch(es).\n" | |
2489 | "To see full details build your kernel with:\n" | |
2490 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2491 | sec_mismatch_count); | |
2492 | } | |
2493 | if (sec_mismatch_fatal) { | |
2494 | fatal("modpost: Section mismatches detected.\n" | |
2495 | "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n"); | |
2496 | } | |
2497 | } | |
1da177e4 | 2498 | |
c53ddacd | 2499 | return err; |
1da177e4 | 2500 | } |