Commit | Line | Data |
---|---|---|
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; | |
eed380f3 GR |
41 | /* ignore missing files */ |
42 | static int ignore_missing_files; | |
588ccd73 | 43 | |
c96fca21 SR |
44 | enum export { |
45 | export_plain, export_unused, export_gpl, | |
46 | export_unused_gpl, export_gpl_future, export_unknown | |
47 | }; | |
1da177e4 | 48 | |
6d9a89ea AK |
49 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
50 | ||
51 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
52 | { |
53 | va_list arglist; | |
54 | ||
55 | fprintf(stderr, "FATAL: "); | |
56 | ||
57 | va_start(arglist, fmt); | |
58 | vfprintf(stderr, fmt, arglist); | |
59 | va_end(arglist); | |
60 | ||
61 | exit(1); | |
62 | } | |
63 | ||
6d9a89ea | 64 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
65 | { |
66 | va_list arglist; | |
67 | ||
68 | fprintf(stderr, "WARNING: "); | |
69 | ||
70 | va_start(arglist, fmt); | |
71 | vfprintf(stderr, fmt, arglist); | |
72 | va_end(arglist); | |
73 | } | |
74 | ||
6d9a89ea | 75 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
76 | { |
77 | va_list arglist; | |
78 | ||
79 | fprintf(stderr, "ERROR: "); | |
80 | ||
81 | va_start(arglist, fmt); | |
82 | vfprintf(stderr, fmt, arglist); | |
83 | va_end(arglist); | |
84 | } | |
85 | ||
d4ef1c30 RR |
86 | static inline bool strends(const char *str, const char *postfix) |
87 | { | |
88 | if (strlen(str) < strlen(postfix)) | |
89 | return false; | |
90 | ||
91 | return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; | |
92 | } | |
93 | ||
040fcc81 SR |
94 | static int is_vmlinux(const char *modname) |
95 | { | |
96 | const char *myname; | |
97 | ||
df578e7d SR |
98 | myname = strrchr(modname, '/'); |
99 | if (myname) | |
040fcc81 SR |
100 | myname++; |
101 | else | |
102 | myname = modname; | |
103 | ||
741f98fe SR |
104 | return (strcmp(myname, "vmlinux") == 0) || |
105 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
106 | } |
107 | ||
1da177e4 LT |
108 | void *do_nofail(void *ptr, const char *expr) |
109 | { | |
df578e7d | 110 | if (!ptr) |
1da177e4 | 111 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 112 | |
1da177e4 LT |
113 | return ptr; |
114 | } | |
115 | ||
116 | /* A list of all modules we processed */ | |
1da177e4 LT |
117 | static struct module *modules; |
118 | ||
5c3ead8c | 119 | static struct module *find_module(char *modname) |
1da177e4 LT |
120 | { |
121 | struct module *mod; | |
122 | ||
123 | for (mod = modules; mod; mod = mod->next) | |
124 | if (strcmp(mod->name, modname) == 0) | |
125 | break; | |
126 | return mod; | |
127 | } | |
128 | ||
d4ef1c30 | 129 | static struct module *new_module(const char *modname) |
1da177e4 LT |
130 | { |
131 | struct module *mod; | |
d4ef1c30 | 132 | char *p; |
62070fa4 | 133 | |
1da177e4 LT |
134 | mod = NOFAIL(malloc(sizeof(*mod))); |
135 | memset(mod, 0, sizeof(*mod)); | |
136 | p = NOFAIL(strdup(modname)); | |
137 | ||
138 | /* strip trailing .o */ | |
d4ef1c30 RR |
139 | if (strends(p, ".o")) { |
140 | p[strlen(p) - 2] = '\0'; | |
141 | mod->is_dot_o = 1; | |
142 | } | |
1da177e4 LT |
143 | |
144 | /* add to list */ | |
145 | mod->name = p; | |
b817f6fe | 146 | mod->gpl_compatible = -1; |
1da177e4 LT |
147 | mod->next = modules; |
148 | modules = mod; | |
149 | ||
150 | return mod; | |
151 | } | |
152 | ||
153 | /* A hash of all exported symbols, | |
154 | * struct symbol is also used for lists of unresolved symbols */ | |
155 | ||
156 | #define SYMBOL_HASH_SIZE 1024 | |
157 | ||
158 | struct symbol { | |
159 | struct symbol *next; | |
160 | struct module *module; | |
161 | unsigned int crc; | |
162 | int crc_valid; | |
163 | unsigned int weak:1; | |
040fcc81 SR |
164 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
165 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
166 | * (only for external modules) **/ | |
b6568b1a | 167 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */ |
bd5cbced | 168 | enum export export; /* Type of export */ |
1da177e4 LT |
169 | char name[0]; |
170 | }; | |
171 | ||
172 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
173 | ||
174 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
175 | static inline unsigned int tdb_hash(const char *name) | |
176 | { | |
177 | unsigned value; /* Used to compute the hash value. */ | |
178 | unsigned i; /* Used to cycle through random values. */ | |
179 | ||
180 | /* Set the initial value from the key size. */ | |
df578e7d | 181 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
182 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
183 | ||
184 | return (1103515243 * value + 12345); | |
185 | } | |
186 | ||
5c3ead8c SR |
187 | /** |
188 | * Allocate a new symbols for use in the hash of exported symbols or | |
189 | * the list of unresolved symbols per module | |
190 | **/ | |
191 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
192 | struct symbol *next) | |
1da177e4 LT |
193 | { |
194 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
195 | ||
196 | memset(s, 0, sizeof(*s)); | |
197 | strcpy(s->name, name); | |
198 | s->weak = weak; | |
199 | s->next = next; | |
200 | return s; | |
201 | } | |
202 | ||
203 | /* For the hash of exported symbols */ | |
bd5cbced RP |
204 | static struct symbol *new_symbol(const char *name, struct module *module, |
205 | enum export export) | |
1da177e4 LT |
206 | { |
207 | unsigned int hash; | |
208 | struct symbol *new; | |
209 | ||
210 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
211 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
212 | new->module = module; | |
bd5cbced | 213 | new->export = export; |
040fcc81 | 214 | return new; |
1da177e4 LT |
215 | } |
216 | ||
5c3ead8c | 217 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
218 | { |
219 | struct symbol *s; | |
220 | ||
221 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
222 | if (name[0] == '.') | |
223 | name++; | |
224 | ||
df578e7d | 225 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
226 | if (strcmp(s->name, name) == 0) |
227 | return s; | |
228 | } | |
229 | return NULL; | |
230 | } | |
231 | ||
7a3ee753 | 232 | static const struct { |
bd5cbced RP |
233 | const char *str; |
234 | enum export export; | |
235 | } export_list[] = { | |
236 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 237 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 238 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 239 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
240 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
241 | { .str = "(unknown)", .export = export_unknown }, | |
242 | }; | |
243 | ||
244 | ||
245 | static const char *export_str(enum export ex) | |
246 | { | |
247 | return export_list[ex].str; | |
248 | } | |
249 | ||
df578e7d | 250 | static enum export export_no(const char *s) |
bd5cbced RP |
251 | { |
252 | int i; | |
df578e7d | 253 | |
534b89a9 SR |
254 | if (!s) |
255 | return export_unknown; | |
bd5cbced RP |
256 | for (i = 0; export_list[i].export != export_unknown; i++) { |
257 | if (strcmp(export_list[i].str, s) == 0) | |
258 | return export_list[i].export; | |
259 | } | |
260 | return export_unknown; | |
261 | } | |
262 | ||
62a26356 AIB |
263 | static const char *sec_name(struct elf_info *elf, int secindex); |
264 | ||
265 | #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) | |
266 | ||
267 | static enum export export_from_secname(struct elf_info *elf, unsigned int sec) | |
268 | { | |
269 | const char *secname = sec_name(elf, sec); | |
270 | ||
271 | if (strstarts(secname, "___ksymtab+")) | |
272 | return export_plain; | |
273 | else if (strstarts(secname, "___ksymtab_unused+")) | |
274 | return export_unused; | |
275 | else if (strstarts(secname, "___ksymtab_gpl+")) | |
276 | return export_gpl; | |
277 | else if (strstarts(secname, "___ksymtab_unused_gpl+")) | |
278 | return export_unused_gpl; | |
279 | else if (strstarts(secname, "___ksymtab_gpl_future+")) | |
280 | return export_gpl_future; | |
281 | else | |
282 | return export_unknown; | |
283 | } | |
284 | ||
1ce53adf | 285 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
286 | { |
287 | if (sec == elf->export_sec) | |
288 | return export_plain; | |
c96fca21 SR |
289 | else if (sec == elf->export_unused_sec) |
290 | return export_unused; | |
bd5cbced RP |
291 | else if (sec == elf->export_gpl_sec) |
292 | return export_gpl; | |
c96fca21 SR |
293 | else if (sec == elf->export_unused_gpl_sec) |
294 | return export_unused_gpl; | |
bd5cbced RP |
295 | else if (sec == elf->export_gpl_future_sec) |
296 | return export_gpl_future; | |
297 | else | |
298 | return export_unknown; | |
299 | } | |
300 | ||
5c3ead8c SR |
301 | /** |
302 | * Add an exported symbol - it may have already been added without a | |
303 | * CRC, in this case just update the CRC | |
304 | **/ | |
bd5cbced RP |
305 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
306 | enum export export) | |
1da177e4 LT |
307 | { |
308 | struct symbol *s = find_symbol(name); | |
309 | ||
310 | if (!s) { | |
bd5cbced | 311 | s = new_symbol(name, mod, export); |
8e70c458 SR |
312 | } else { |
313 | if (!s->preloaded) { | |
7b75b13c | 314 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
315 | "was in %s%s\n", mod->name, name, |
316 | s->module->name, | |
317 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f | 318 | } else { |
baec30e4 | 319 | /* In case Module.symvers was out of date */ |
4b21960f | 320 | s->module = mod; |
8e70c458 | 321 | } |
1da177e4 | 322 | } |
8e70c458 | 323 | s->preloaded = 0; |
040fcc81 SR |
324 | s->vmlinux = is_vmlinux(mod->name); |
325 | s->kernel = 0; | |
bd5cbced | 326 | s->export = export; |
040fcc81 SR |
327 | return s; |
328 | } | |
329 | ||
330 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 331 | unsigned int crc, enum export export) |
040fcc81 SR |
332 | { |
333 | struct symbol *s = find_symbol(name); | |
334 | ||
b6568b1a | 335 | if (!s) { |
bd5cbced | 336 | s = new_symbol(name, mod, export); |
b6568b1a RR |
337 | /* Don't complain when we find it later. */ |
338 | s->preloaded = 1; | |
339 | } | |
040fcc81 SR |
340 | s->crc = crc; |
341 | s->crc_valid = 1; | |
1da177e4 LT |
342 | } |
343 | ||
5c3ead8c | 344 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
345 | { |
346 | struct stat st; | |
eb3d5cc6 | 347 | void *map = MAP_FAILED; |
1da177e4 LT |
348 | int fd; |
349 | ||
350 | fd = open(filename, O_RDONLY); | |
eb3d5cc6 | 351 | if (fd < 0) |
1da177e4 | 352 | return NULL; |
eb3d5cc6 JJ |
353 | if (fstat(fd, &st)) |
354 | goto failed; | |
1da177e4 LT |
355 | |
356 | *size = st.st_size; | |
357 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
1da177e4 | 358 | |
eb3d5cc6 JJ |
359 | failed: |
360 | close(fd); | |
1da177e4 LT |
361 | if (map == MAP_FAILED) |
362 | return NULL; | |
363 | return map; | |
364 | } | |
365 | ||
5c3ead8c SR |
366 | /** |
367 | * Return a copy of the next line in a mmap'ed file. | |
368 | * spaces in the beginning of the line is trimmed away. | |
369 | * Return a pointer to a static buffer. | |
370 | **/ | |
df578e7d | 371 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
372 | { |
373 | static char line[4096]; | |
374 | int skip = 1; | |
375 | size_t len = 0; | |
376 | signed char *p = (signed char *)file + *pos; | |
377 | char *s = line; | |
378 | ||
df578e7d | 379 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
380 | if (skip && isspace(*p)) { |
381 | p++; | |
382 | continue; | |
383 | } | |
384 | skip = 0; | |
385 | if (*p != '\n' && (*pos < size)) { | |
386 | len++; | |
387 | *s++ = *p++; | |
388 | if (len > 4095) | |
389 | break; /* Too long, stop */ | |
390 | } else { | |
391 | /* End of string */ | |
392 | *s = '\0'; | |
393 | return line; | |
394 | } | |
395 | } | |
396 | /* End of buffer */ | |
397 | return NULL; | |
398 | } | |
399 | ||
5c3ead8c | 400 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
401 | { |
402 | munmap(file, size); | |
403 | } | |
404 | ||
85bd2fdd | 405 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
406 | { |
407 | unsigned int i; | |
85bd2fdd | 408 | Elf_Ehdr *hdr; |
1da177e4 LT |
409 | Elf_Shdr *sechdrs; |
410 | Elf_Sym *sym; | |
1ce53adf DV |
411 | const char *secstrings; |
412 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
413 | |
414 | hdr = grab_file(filename, &info->size); | |
415 | if (!hdr) { | |
eed380f3 GR |
416 | if (ignore_missing_files) { |
417 | fprintf(stderr, "%s: %s (ignored)\n", filename, | |
418 | strerror(errno)); | |
419 | return 0; | |
420 | } | |
1da177e4 | 421 | perror(filename); |
6803dc0e | 422 | exit(1); |
1da177e4 LT |
423 | } |
424 | info->hdr = hdr; | |
85bd2fdd SR |
425 | if (info->size < sizeof(*hdr)) { |
426 | /* file too small, assume this is an empty .o file */ | |
427 | return 0; | |
428 | } | |
429 | /* Is this a valid ELF file? */ | |
430 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
431 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
432 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
433 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
434 | /* Not an ELF file - silently ignore it */ | |
435 | return 0; | |
436 | } | |
1da177e4 | 437 | /* Fix endianness in ELF header */ |
7d875a02 AK |
438 | hdr->e_type = TO_NATIVE(hdr->e_type); |
439 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
440 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
441 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
442 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
443 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
444 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
445 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
446 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
447 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
448 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
449 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
450 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
451 | sechdrs = (void *)hdr + hdr->e_shoff; |
452 | info->sechdrs = sechdrs; | |
453 | ||
a83710e5 PS |
454 | /* Check if file offset is correct */ |
455 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
456 | fatal("section header offset=%lu in file '%s' is bigger than " |
457 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
458 | filename, info->size); | |
a83710e5 PS |
459 | return 0; |
460 | } | |
461 | ||
6845756b | 462 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
463 | /* |
464 | * There are more than 64k sections, | |
465 | * read count from .sh_size. | |
1ce53adf DV |
466 | */ |
467 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
468 | } | |
469 | else { | |
470 | info->num_sections = hdr->e_shnum; | |
471 | } | |
472 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 473 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
474 | } |
475 | else { | |
476 | info->secindex_strings = hdr->e_shstrndx; | |
477 | } | |
478 | ||
1da177e4 | 479 | /* Fix endianness in section headers */ |
1ce53adf | 480 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
481 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
482 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
483 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
484 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
485 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
486 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
487 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
488 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
489 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
490 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
491 | } |
492 | /* Find symbol table. */ | |
1ce53adf DV |
493 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
494 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 495 | const char *secname; |
56fc82c5 | 496 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 497 | |
56fc82c5 | 498 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
499 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
500 | "sizeof(*hrd)=%zu\n", filename, | |
501 | (unsigned long)sechdrs[i].sh_offset, | |
502 | sizeof(*hdr)); | |
85bd2fdd SR |
503 | return 0; |
504 | } | |
bd5cbced RP |
505 | secname = secstrings + sechdrs[i].sh_name; |
506 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
507 | if (nobits) |
508 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
509 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
510 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
511 | } else if (strcmp(secname, "__ksymtab") == 0) |
512 | info->export_sec = i; | |
c96fca21 SR |
513 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
514 | info->export_unused_sec = i; | |
bd5cbced RP |
515 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
516 | info->export_gpl_sec = i; | |
c96fca21 SR |
517 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
518 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
519 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
520 | info->export_gpl_future_sec = i; | |
521 | ||
1ce53adf DV |
522 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
523 | unsigned int sh_link_idx; | |
524 | symtab_idx = i; | |
525 | info->symtab_start = (void *)hdr + | |
526 | sechdrs[i].sh_offset; | |
527 | info->symtab_stop = (void *)hdr + | |
528 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 529 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
530 | info->strtab = (void *)hdr + |
531 | sechdrs[sh_link_idx].sh_offset; | |
532 | } | |
1da177e4 | 533 | |
1ce53adf DV |
534 | /* 32bit section no. table? ("more than 64k sections") */ |
535 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
536 | symtab_shndx_idx = i; | |
537 | info->symtab_shndx_start = (void *)hdr + | |
538 | sechdrs[i].sh_offset; | |
539 | info->symtab_shndx_stop = (void *)hdr + | |
540 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
541 | } | |
1da177e4 | 542 | } |
df578e7d | 543 | if (!info->symtab_start) |
cb80514d | 544 | fatal("%s has no symtab?\n", filename); |
df578e7d | 545 | |
1da177e4 LT |
546 | /* Fix endianness in symbols */ |
547 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
548 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
549 | sym->st_name = TO_NATIVE(sym->st_name); | |
550 | sym->st_value = TO_NATIVE(sym->st_value); | |
551 | sym->st_size = TO_NATIVE(sym->st_size); | |
552 | } | |
1ce53adf DV |
553 | |
554 | if (symtab_shndx_idx != ~0U) { | |
555 | Elf32_Word *p; | |
6845756b | 556 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 557 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 558 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
559 | symtab_idx); |
560 | /* Fix endianness */ | |
561 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
562 | p++) | |
563 | *p = TO_NATIVE(*p); | |
564 | } | |
565 | ||
85bd2fdd | 566 | return 1; |
1da177e4 LT |
567 | } |
568 | ||
5c3ead8c | 569 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
570 | { |
571 | release_file(info->hdr, info->size); | |
572 | } | |
573 | ||
4d7365d6 SR |
574 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
575 | { | |
576 | /* ignore __this_module, it will be resolved shortly */ | |
b92021b0 | 577 | if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0) |
4d7365d6 SR |
578 | return 1; |
579 | /* ignore global offset table */ | |
580 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
581 | return 1; | |
582 | if (info->hdr->e_machine == EM_PPC) | |
583 | /* Special register function linked on all modules during final link of .ko */ | |
584 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
585 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
586 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
8fe9c93e AS |
587 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 || |
588 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
589 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
4d7365d6 | 590 | return 1; |
7fca5dc8 SR |
591 | if (info->hdr->e_machine == EM_PPC64) |
592 | /* Special register function linked on all modules during final link of .ko */ | |
593 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
8fe9c93e AS |
594 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 || |
595 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
596 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
7fca5dc8 | 597 | return 1; |
4d7365d6 SR |
598 | /* Do not ignore this symbol */ |
599 | return 0; | |
600 | } | |
601 | ||
b92021b0 RR |
602 | #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_) |
603 | #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_) | |
1da177e4 | 604 | |
5c3ead8c SR |
605 | static void handle_modversions(struct module *mod, struct elf_info *info, |
606 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
607 | { |
608 | unsigned int crc; | |
62a26356 AIB |
609 | enum export export; |
610 | ||
258f7426 FR |
611 | if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
612 | strncmp(symname, "__ksymtab", 9) == 0) | |
62a26356 AIB |
613 | export = export_from_secname(info, get_secindex(info, sym)); |
614 | else | |
615 | export = export_from_sec(info, get_secindex(info, sym)); | |
1da177e4 | 616 | |
b5064654 AK |
617 | /* CRC'd symbol */ |
618 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
619 | crc = (unsigned int) sym->st_value; | |
620 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, | |
621 | export); | |
622 | } | |
623 | ||
1da177e4 LT |
624 | switch (sym->st_shndx) { |
625 | case SHN_COMMON: | |
ef178f92 AK |
626 | if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) { |
627 | /* Should warn here, but modpost runs before the linker */ | |
628 | } else | |
629 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); | |
1da177e4 | 630 | break; |
1da177e4 LT |
631 | case SHN_UNDEF: |
632 | /* undefined symbol */ | |
633 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
634 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
635 | break; | |
4d7365d6 | 636 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 637 | break; |
8d529014 BC |
638 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
639 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
640 | /* add compatibility with older glibc */ | |
641 | #ifndef STT_SPARC_REGISTER | |
642 | #define STT_SPARC_REGISTER STT_REGISTER | |
643 | #endif | |
1da177e4 LT |
644 | if (info->hdr->e_machine == EM_SPARC || |
645 | info->hdr->e_machine == EM_SPARCV9) { | |
646 | /* Ignore register directives. */ | |
8d529014 | 647 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 648 | break; |
62070fa4 SR |
649 | if (symname[0] == '.') { |
650 | char *munged = strdup(symname); | |
651 | munged[0] = '_'; | |
652 | munged[1] = toupper(munged[1]); | |
653 | symname = munged; | |
654 | } | |
1da177e4 LT |
655 | } |
656 | #endif | |
62070fa4 | 657 | |
b92021b0 RR |
658 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
659 | if (symname[0] != '_') | |
660 | break; | |
661 | else | |
662 | symname++; | |
663 | #endif | |
664 | mod->unres = alloc_symbol(symname, | |
665 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
666 | mod->unres); | |
1da177e4 LT |
667 | break; |
668 | default: | |
669 | /* All exported symbols */ | |
8d99513c | 670 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
671 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
672 | export); | |
1da177e4 | 673 | } |
b92021b0 | 674 | if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0) |
1da177e4 | 675 | mod->has_init = 1; |
b92021b0 | 676 | if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0) |
1da177e4 LT |
677 | mod->has_cleanup = 1; |
678 | break; | |
679 | } | |
680 | } | |
681 | ||
5c3ead8c SR |
682 | /** |
683 | * Parse tag=value strings from .modinfo section | |
684 | **/ | |
1da177e4 LT |
685 | static char *next_string(char *string, unsigned long *secsize) |
686 | { | |
687 | /* Skip non-zero chars */ | |
688 | while (string[0]) { | |
689 | string++; | |
690 | if ((*secsize)-- <= 1) | |
691 | return NULL; | |
692 | } | |
693 | ||
694 | /* Skip any zero padding. */ | |
695 | while (!string[0]) { | |
696 | string++; | |
697 | if ((*secsize)-- <= 1) | |
698 | return NULL; | |
699 | } | |
700 | return string; | |
701 | } | |
702 | ||
b817f6fe SR |
703 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
704 | const char *tag, char *info) | |
1da177e4 LT |
705 | { |
706 | char *p; | |
707 | unsigned int taglen = strlen(tag); | |
708 | unsigned long size = modinfo_len; | |
709 | ||
b817f6fe SR |
710 | if (info) { |
711 | size -= info - (char *)modinfo; | |
712 | modinfo = next_string(info, &size); | |
713 | } | |
714 | ||
1da177e4 LT |
715 | for (p = modinfo; p; p = next_string(p, &size)) { |
716 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
717 | return p + taglen + 1; | |
718 | } | |
719 | return NULL; | |
720 | } | |
721 | ||
b817f6fe SR |
722 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
723 | const char *tag) | |
724 | ||
725 | { | |
726 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
727 | } | |
728 | ||
4c8fbca5 SR |
729 | /** |
730 | * Test if string s ends in string sub | |
731 | * return 0 if match | |
732 | **/ | |
733 | static int strrcmp(const char *s, const char *sub) | |
734 | { | |
df578e7d | 735 | int slen, sublen; |
62070fa4 | 736 | |
4c8fbca5 SR |
737 | if (!s || !sub) |
738 | return 1; | |
62070fa4 | 739 | |
4c8fbca5 | 740 | slen = strlen(s); |
df578e7d | 741 | sublen = strlen(sub); |
62070fa4 | 742 | |
4c8fbca5 SR |
743 | if ((slen == 0) || (sublen == 0)) |
744 | return 1; | |
745 | ||
df578e7d SR |
746 | if (sublen > slen) |
747 | return 1; | |
4c8fbca5 | 748 | |
df578e7d | 749 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
750 | } |
751 | ||
ff13f926 SR |
752 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
753 | { | |
58fb0d4f SR |
754 | if (sym) |
755 | return elf->strtab + sym->st_name; | |
756 | else | |
f666751a | 757 | return "(unknown)"; |
ff13f926 SR |
758 | } |
759 | ||
1ce53adf | 760 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
761 | { |
762 | Elf_Shdr *sechdrs = elf->sechdrs; | |
763 | return (void *)elf->hdr + | |
1ce53adf DV |
764 | elf->sechdrs[elf->secindex_strings].sh_offset + |
765 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
766 | } |
767 | ||
768 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
769 | { | |
770 | return (void *)elf->hdr + | |
1ce53adf DV |
771 | elf->sechdrs[elf->secindex_strings].sh_offset + |
772 | sechdr->sh_name; | |
ff13f926 SR |
773 | } |
774 | ||
10668220 SR |
775 | /* The pattern is an array of simple patterns. |
776 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 777 | * "*foo" will match a string that ends with "foo" |
10668220 | 778 | * "foo*" will match a string that begins with "foo" |
09c20c03 | 779 | * "*foo*" will match a string that contains "foo" |
10668220 | 780 | */ |
5c725138 | 781 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
782 | { |
783 | const char *p; | |
784 | while (*pat) { | |
785 | p = *pat++; | |
786 | const char *endp = p + strlen(p) - 1; | |
787 | ||
09c20c03 PG |
788 | /* "*foo*" */ |
789 | if (*p == '*' && *endp == '*') { | |
790 | char *here, *bare = strndup(p + 1, strlen(p) - 2); | |
791 | ||
792 | here = strstr(sym, bare); | |
793 | free(bare); | |
794 | if (here != NULL) | |
795 | return 1; | |
796 | } | |
6c5bd235 | 797 | /* "*foo" */ |
09c20c03 | 798 | else if (*p == '*') { |
6c5bd235 SR |
799 | if (strrcmp(sym, p + 1) == 0) |
800 | return 1; | |
801 | } | |
10668220 | 802 | /* "foo*" */ |
6c5bd235 | 803 | else if (*endp == '*') { |
10668220 SR |
804 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
805 | return 1; | |
806 | } | |
10668220 SR |
807 | /* no wildcards */ |
808 | else { | |
809 | if (strcmp(p, sym) == 0) | |
810 | return 1; | |
811 | } | |
812 | } | |
813 | /* no match */ | |
814 | return 0; | |
815 | } | |
816 | ||
10668220 | 817 | /* sections that we do not want to do full section mismatch check on */ |
7a3ee753 | 818 | static const char *const section_white_list[] = |
4391ed6a SR |
819 | { |
820 | ".comment*", | |
821 | ".debug*", | |
4d10c223 | 822 | ".cranges", /* sh64 */ |
1121584f | 823 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 824 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 825 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
826 | ".mdebug*", /* alpha, score, mips etc. */ |
827 | ".pdr", /* alpha, score, mips etc. */ | |
828 | ".stab*", | |
829 | ".note*", | |
830 | ".got*", | |
831 | ".toc*", | |
af42e970 MF |
832 | ".xt.prop", /* xtensa */ |
833 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
834 | ".arcextmap*", /* arc */ |
835 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
ef178f92 | 836 | ".gnu.lto*", |
4391ed6a SR |
837 | NULL |
838 | }; | |
10668220 | 839 | |
e241a630 | 840 | /* |
b614a697 | 841 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 842 | * The cause of this is often a section specified in assembler |
b614a697 | 843 | * without "ax" / "aw". |
e241a630 | 844 | */ |
b614a697 | 845 | static void check_section(const char *modname, struct elf_info *elf, |
bb66fc67 | 846 | Elf_Shdr *sechdr) |
e241a630 | 847 | { |
b614a697 AK |
848 | const char *sec = sech_name(elf, sechdr); |
849 | ||
850 | if (sechdr->sh_type == SHT_PROGBITS && | |
851 | !(sechdr->sh_flags & SHF_ALLOC) && | |
852 | !match(sec, section_white_list)) { | |
853 | warn("%s (%s): unexpected non-allocatable section.\n" | |
854 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
855 | "Note that for example <linux/init.h> contains\n" | |
856 | "section definitions for use in .S files.\n\n", | |
857 | modname, sec); | |
e241a630 | 858 | } |
e241a630 SR |
859 | } |
860 | ||
861 | ||
862 | ||
eb8f6890 | 863 | #define ALL_INIT_DATA_SECTIONS \ |
a0d8f803 RV |
864 | ".init.setup", ".init.rodata", ".meminit.rodata", \ |
865 | ".init.data", ".meminit.data" | |
eb8f6890 | 866 | #define ALL_EXIT_DATA_SECTIONS \ |
a0d8f803 | 867 | ".exit.data", ".memexit.data" |
10668220 | 868 | |
eb8f6890 | 869 | #define ALL_INIT_TEXT_SECTIONS \ |
a0d8f803 | 870 | ".init.text", ".meminit.text" |
eb8f6890 | 871 | #define ALL_EXIT_TEXT_SECTIONS \ |
a0d8f803 | 872 | ".exit.text", ".memexit.text" |
10668220 | 873 | |
bb15d8db | 874 | #define ALL_PCI_INIT_SECTIONS \ |
a0d8f803 RV |
875 | ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \ |
876 | ".pci_fixup_enable", ".pci_fixup_resume", \ | |
877 | ".pci_fixup_resume_early", ".pci_fixup_suspend" | |
bb15d8db | 878 | |
e24f6628 PG |
879 | #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS |
880 | #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS | |
4a31a229 UKK |
881 | |
882 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
883 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 884 | |
a0d8f803 | 885 | #define DATA_SECTIONS ".data", ".data.rel" |
157d1972 QC |
886 | #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \ |
887 | ".kprobes.text" | |
52dc0595 | 888 | #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \ |
6c730bfc | 889 | ".fixup", ".entry.text", ".exception.text", ".text.*" |
10668220 | 890 | |
fd6c3a8d | 891 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d | 892 | #define MEM_INIT_SECTIONS ".meminit.*" |
eb8f6890 | 893 | |
fd6c3a8d | 894 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d | 895 | #define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f6890 | 896 | |
52dc0595 QC |
897 | #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \ |
898 | TEXT_SECTIONS, OTHER_TEXT_SECTIONS | |
899 | ||
6c5bd235 | 900 | /* init data sections */ |
7a3ee753 MK |
901 | static const char *const init_data_sections[] = |
902 | { ALL_INIT_DATA_SECTIONS, NULL }; | |
6c5bd235 SR |
903 | |
904 | /* all init sections */ | |
7a3ee753 | 905 | static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
906 | |
907 | /* All init and exit sections (code + data) */ | |
7a3ee753 | 908 | static const char *const init_exit_sections[] = |
eb8f6890 | 909 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 | 910 | |
4a3893d0 PG |
911 | /* all text sections */ |
912 | static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL }; | |
913 | ||
6c5bd235 | 914 | /* data section */ |
7a3ee753 | 915 | static const char *const data_sections[] = { DATA_SECTIONS, NULL }; |
6c5bd235 | 916 | |
6c5bd235 SR |
917 | |
918 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
919 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
920 | "*driver", \ | |
921 | "*_template", /* scsi uses *_template a lot */ \ | |
922 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
923 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
924 | "*_ops", \ | |
925 | "*_probe", \ | |
926 | "*_probe_one", \ | |
927 | "*_console" | |
6c5bd235 | 928 | |
7a3ee753 MK |
929 | static const char *const head_sections[] = { ".head.text*", NULL }; |
930 | static const char *const linker_symbols[] = | |
6c5bd235 | 931 | { "__init_begin", "_sinittext", "_einittext", NULL }; |
4a3893d0 | 932 | static const char *const optim_symbols[] = { "*.constprop.*", NULL }; |
6c5bd235 | 933 | |
588ccd73 | 934 | enum mismatch { |
bbd3f4fb UKK |
935 | TEXT_TO_ANY_INIT, |
936 | DATA_TO_ANY_INIT, | |
937 | TEXT_TO_ANY_EXIT, | |
938 | DATA_TO_ANY_EXIT, | |
939 | XXXINIT_TO_SOME_INIT, | |
940 | XXXEXIT_TO_SOME_EXIT, | |
941 | ANY_INIT_TO_ANY_EXIT, | |
942 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 | 943 | EXPORT_TO_INIT_EXIT, |
52dc0595 | 944 | EXTABLE_TO_NON_TEXT, |
588ccd73 SR |
945 | }; |
946 | ||
e5d8f59a QC |
947 | /** |
948 | * Describe how to match sections on different criterias: | |
949 | * | |
950 | * @fromsec: Array of sections to be matched. | |
951 | * | |
952 | * @bad_tosec: Relocations applied to a section in @fromsec to a section in | |
953 | * this array is forbidden (black-list). Can be empty. | |
954 | * | |
955 | * @good_tosec: Relocations applied to a section in @fromsec must be | |
956 | * targetting sections in this array (white-list). Can be empty. | |
957 | * | |
958 | * @mismatch: Type of mismatch. | |
959 | * | |
960 | * @symbol_white_list: Do not match a relocation to a symbol in this list | |
961 | * even if it is targetting a section in @bad_to_sec. | |
962 | * | |
963 | * @handler: Specific handler to call when a match is found. If NULL, | |
964 | * default_mismatch_handler() will be called. | |
965 | * | |
966 | */ | |
10668220 SR |
967 | struct sectioncheck { |
968 | const char *fromsec[20]; | |
050e57fd QC |
969 | const char *bad_tosec[20]; |
970 | const char *good_tosec[20]; | |
588ccd73 | 971 | enum mismatch mismatch; |
af92a82d | 972 | const char *symbol_white_list[20]; |
644e8f14 QC |
973 | void (*handler)(const char *modname, struct elf_info *elf, |
974 | const struct sectioncheck* const mismatch, | |
975 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec); | |
976 | ||
10668220 SR |
977 | }; |
978 | ||
52dc0595 QC |
979 | static void extable_mismatch_handler(const char *modname, struct elf_info *elf, |
980 | const struct sectioncheck* const mismatch, | |
981 | Elf_Rela *r, Elf_Sym *sym, | |
982 | const char *fromsec); | |
983 | ||
7a3ee753 | 984 | static const struct sectioncheck sectioncheck[] = { |
10668220 SR |
985 | /* Do not reference init/exit code/data from |
986 | * normal code and data | |
987 | */ | |
988 | { | |
588ccd73 | 989 | .fromsec = { TEXT_SECTIONS, NULL }, |
050e57fd | 990 | .bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 991 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 992 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
993 | }, |
994 | { | |
995 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 996 | .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 997 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 998 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 999 | }, |
0db25245 UKK |
1000 | { |
1001 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 1002 | .bad_tosec = { INIT_SECTIONS, NULL }, |
0db25245 UKK |
1003 | .mismatch = DATA_TO_ANY_INIT, |
1004 | .symbol_white_list = { | |
1005 | "*_template", "*_timer", "*_sht", "*_ops", | |
1006 | "*_probe", "*_probe_one", "*_console", NULL | |
1007 | }, | |
1008 | }, | |
588ccd73 SR |
1009 | { |
1010 | .fromsec = { TEXT_SECTIONS, NULL }, | |
050e57fd | 1011 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1012 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 1013 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
1014 | }, |
1015 | { | |
1016 | .fromsec = { DATA_SECTIONS, NULL }, | |
050e57fd | 1017 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1018 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 1019 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 1020 | }, |
e24f6628 | 1021 | /* Do not reference init code/data from meminit code/data */ |
eb8f6890 | 1022 | { |
4a31a229 | 1023 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
050e57fd | 1024 | .bad_tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 1025 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 1026 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 1027 | }, |
e24f6628 | 1028 | /* Do not reference exit code/data from memexit code/data */ |
eb8f6890 | 1029 | { |
4a31a229 | 1030 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
050e57fd | 1031 | .bad_tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1032 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1033 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1034 | }, |
1035 | /* Do not use exit code/data from init code */ | |
1036 | { | |
eb8f6890 | 1037 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
050e57fd | 1038 | .bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1039 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 1040 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1041 | }, |
1042 | /* Do not use init code/data from exit code */ | |
1043 | { | |
eb8f6890 | 1044 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
050e57fd | 1045 | .bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1046 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1047 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1048 | }, |
bb15d8db SAS |
1049 | { |
1050 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
050e57fd | 1051 | .bad_tosec = { INIT_SECTIONS, NULL }, |
bb15d8db SAS |
1052 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
1053 | .symbol_white_list = { NULL }, | |
1054 | }, | |
10668220 SR |
1055 | /* Do not export init/exit functions or data */ |
1056 | { | |
1057 | .fromsec = { "__ksymtab*", NULL }, | |
050e57fd | 1058 | .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1059 | .mismatch = EXPORT_TO_INIT_EXIT, |
1060 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
52dc0595 QC |
1061 | }, |
1062 | { | |
1063 | .fromsec = { "__ex_table", NULL }, | |
1064 | /* If you're adding any new black-listed sections in here, consider | |
1065 | * adding a special 'printer' for them in scripts/check_extable. | |
1066 | */ | |
1067 | .bad_tosec = { ".altinstr_replacement", NULL }, | |
1068 | .good_tosec = {ALL_TEXT_SECTIONS , NULL}, | |
1069 | .mismatch = EXTABLE_TO_NON_TEXT, | |
1070 | .handler = extable_mismatch_handler, | |
10668220 SR |
1071 | } |
1072 | }; | |
1073 | ||
0d2a636e UKK |
1074 | static const struct sectioncheck *section_mismatch( |
1075 | const char *fromsec, const char *tosec) | |
10668220 SR |
1076 | { |
1077 | int i; | |
1078 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1079 | const struct sectioncheck *check = §ioncheck[0]; | |
1080 | ||
c5c3439a QC |
1081 | /* |
1082 | * The target section could be the SHT_NUL section when we're | |
1083 | * handling relocations to un-resolved symbols, trying to match it | |
1084 | * doesn't make much sense and causes build failures on parisc and | |
1085 | * mn10300 architectures. | |
1086 | */ | |
1087 | if (*tosec == '\0') | |
1088 | return NULL; | |
1089 | ||
10668220 | 1090 | for (i = 0; i < elems; i++) { |
050e57fd QC |
1091 | if (match(fromsec, check->fromsec)) { |
1092 | if (check->bad_tosec[0] && match(tosec, check->bad_tosec)) | |
1093 | return check; | |
1094 | if (check->good_tosec[0] && !match(tosec, check->good_tosec)) | |
1095 | return check; | |
1096 | } | |
10668220 SR |
1097 | check++; |
1098 | } | |
0d2a636e | 1099 | return NULL; |
10668220 SR |
1100 | } |
1101 | ||
4c8fbca5 SR |
1102 | /** |
1103 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1104 | * |
4c8fbca5 SR |
1105 | * Pattern 1: |
1106 | * If a module parameter is declared __initdata and permissions=0 | |
1107 | * then this is legal despite the warning generated. | |
1108 | * We cannot see value of permissions here, so just ignore | |
1109 | * this pattern. | |
1110 | * The pattern is identified by: | |
1111 | * tosec = .init.data | |
9209aed0 | 1112 | * fromsec = .data* |
4c8fbca5 | 1113 | * atsym =__param* |
62070fa4 | 1114 | * |
6a841528 RR |
1115 | * Pattern 1a: |
1116 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1117 | * The pattern is identified by: | |
1118 | * tosec = .init.text | |
1119 | * fromsec = .data* | |
1120 | * atsym = __param_ops_* | |
1121 | * | |
4c8fbca5 | 1122 | * Pattern 2: |
72ee59b5 | 1123 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1124 | * add, remove, probe functions etc. |
4c8fbca5 | 1125 | * the pattern is identified by: |
83cda2bb SR |
1126 | * tosec = init or exit section |
1127 | * fromsec = data section | |
df578e7d SR |
1128 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1129 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1130 | * |
1131 | * Pattern 3: | |
c993971f | 1132 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1133 | * |
1d8af559 | 1134 | * Pattern 4: |
ee6a8545 VG |
1135 | * Some symbols belong to init section but still it is ok to reference |
1136 | * these from non-init sections as these symbols don't have any memory | |
1137 | * allocated for them and symbol address and value are same. So even | |
1138 | * if init section is freed, its ok to reference those symbols. | |
1139 | * For ex. symbols marking the init section boundaries. | |
1140 | * This pattern is identified by | |
1141 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1142 | * |
4a3893d0 PG |
1143 | * Pattern 5: |
1144 | * GCC may optimize static inlines when fed constant arg(s) resulting | |
1145 | * in functions like cpumask_empty() -- generating an associated symbol | |
1146 | * cpumask_empty.constprop.3 that appears in the audit. If the const that | |
1147 | * is passed in comes from __init, like say nmi_ipi_mask, we get a | |
1148 | * meaningless section warning. May need to add isra symbols too... | |
1149 | * This pattern is identified by | |
1150 | * tosec = init section | |
1151 | * fromsec = text section | |
1152 | * refsymname = *.constprop.* | |
1153 | * | |
4c8fbca5 | 1154 | **/ |
af92a82d UKK |
1155 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1156 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1157 | const char *tosec, const char *tosym) |
4c8fbca5 | 1158 | { |
4c8fbca5 | 1159 | /* Check for pattern 1 */ |
6c5bd235 SR |
1160 | if (match(tosec, init_data_sections) && |
1161 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1162 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1163 | return 0; | |
4c8fbca5 | 1164 | |
6a841528 RR |
1165 | /* Check for pattern 1a */ |
1166 | if (strcmp(tosec, ".init.text") == 0 && | |
1167 | match(fromsec, data_sections) && | |
1168 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1169 | return 0; | |
1170 | ||
4c8fbca5 | 1171 | /* Check for pattern 2 */ |
6c5bd235 SR |
1172 | if (match(tosec, init_exit_sections) && |
1173 | match(fromsec, data_sections) && | |
af92a82d | 1174 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1175 | return 0; |
4c8fbca5 | 1176 | |
9bf8cb9b | 1177 | /* Check for pattern 3 */ |
6c5bd235 SR |
1178 | if (match(fromsec, head_sections) && |
1179 | match(tosec, init_sections)) | |
58fb0d4f | 1180 | return 0; |
9bf8cb9b | 1181 | |
1d8af559 | 1182 | /* Check for pattern 4 */ |
58fb0d4f SR |
1183 | if (match(tosym, linker_symbols)) |
1184 | return 0; | |
9bf8cb9b | 1185 | |
4a3893d0 PG |
1186 | /* Check for pattern 5 */ |
1187 | if (match(fromsec, text_sections) && | |
1188 | match(tosec, init_sections) && | |
1189 | match(fromsym, optim_symbols)) | |
1190 | return 0; | |
1191 | ||
58fb0d4f | 1192 | return 1; |
4c8fbca5 SR |
1193 | } |
1194 | ||
93684d3b SR |
1195 | /** |
1196 | * Find symbol based on relocation record info. | |
1197 | * In some cases the symbol supplied is a valid symbol so | |
1198 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1199 | * In other cases the symbol needs to be looked up in the symbol table | |
1200 | * based on section and address. | |
1201 | * **/ | |
9ad21c3f | 1202 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1203 | Elf_Sym *relsym) |
1204 | { | |
1205 | Elf_Sym *sym; | |
9ad21c3f SR |
1206 | Elf_Sym *near = NULL; |
1207 | Elf64_Sword distance = 20; | |
1208 | Elf64_Sword d; | |
1ce53adf | 1209 | unsigned int relsym_secindex; |
93684d3b SR |
1210 | |
1211 | if (relsym->st_name != 0) | |
1212 | return relsym; | |
1ce53adf DV |
1213 | |
1214 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1215 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1216 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1217 | continue; |
ae4ac123 AN |
1218 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1219 | continue; | |
93684d3b SR |
1220 | if (sym->st_value == addr) |
1221 | return sym; | |
9ad21c3f SR |
1222 | /* Find a symbol nearby - addr are maybe negative */ |
1223 | d = sym->st_value - addr; | |
1224 | if (d < 0) | |
1225 | d = addr - sym->st_value; | |
1226 | if (d < distance) { | |
1227 | distance = d; | |
1228 | near = sym; | |
1229 | } | |
93684d3b | 1230 | } |
9ad21c3f SR |
1231 | /* We need a close match */ |
1232 | if (distance < 20) | |
1233 | return near; | |
1234 | else | |
1235 | return NULL; | |
93684d3b SR |
1236 | } |
1237 | ||
da68d61f DB |
1238 | static inline int is_arm_mapping_symbol(const char *str) |
1239 | { | |
6c34f1f5 | 1240 | return str[0] == '$' && strchr("axtd", str[1]) |
da68d61f DB |
1241 | && (str[2] == '\0' || str[2] == '.'); |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1246 | * one of the magic symbols emitted used by current ARM tools. | |
1247 | * | |
1248 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1249 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1250 | * only by merging __exit and __init sections into __text, bloating | |
1251 | * the kernel (which is especially evil on embedded platforms). | |
1252 | */ | |
1253 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1254 | { | |
1255 | const char *name = elf->strtab + sym->st_name; | |
1256 | ||
1257 | if (!name || !strlen(name)) | |
1258 | return 0; | |
1259 | return !is_arm_mapping_symbol(name); | |
1260 | } | |
1261 | ||
b39927cf | 1262 | /* |
43c74d17 SR |
1263 | * Find symbols before or equal addr and after addr - in the section sec. |
1264 | * If we find two symbols with equal offset prefer one with a valid name. | |
1265 | * The ELF format may have a better way to detect what type of symbol | |
1266 | * it is, but this works for now. | |
b39927cf | 1267 | **/ |
157c23c8 SR |
1268 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1269 | const char *sec) | |
b39927cf SR |
1270 | { |
1271 | Elf_Sym *sym; | |
157c23c8 | 1272 | Elf_Sym *near = NULL; |
157c23c8 | 1273 | Elf_Addr distance = ~0; |
62070fa4 | 1274 | |
b39927cf SR |
1275 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1276 | const char *symsec; | |
1277 | ||
1ce53adf | 1278 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1279 | continue; |
1ce53adf | 1280 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1281 | if (strcmp(symsec, sec) != 0) |
1282 | continue; | |
da68d61f DB |
1283 | if (!is_valid_name(elf, sym)) |
1284 | continue; | |
b39927cf | 1285 | if (sym->st_value <= addr) { |
157c23c8 SR |
1286 | if ((addr - sym->st_value) < distance) { |
1287 | distance = addr - sym->st_value; | |
1288 | near = sym; | |
1289 | } else if ((addr - sym->st_value) == distance) { | |
1290 | near = sym; | |
43c74d17 | 1291 | } |
b39927cf SR |
1292 | } |
1293 | } | |
157c23c8 | 1294 | return near; |
b39927cf SR |
1295 | } |
1296 | ||
588ccd73 SR |
1297 | /* |
1298 | * Convert a section name to the function/data attribute | |
1299 | * .init.text => __init | |
588ccd73 SR |
1300 | * .memexitconst => __memconst |
1301 | * etc. | |
cbcf14a9 AS |
1302 | * |
1303 | * The memory of returned value has been allocated on a heap. The user of this | |
1304 | * method should free it after usage. | |
588ccd73 SR |
1305 | */ |
1306 | static char *sec2annotation(const char *s) | |
1307 | { | |
1308 | if (match(s, init_exit_sections)) { | |
1309 | char *p = malloc(20); | |
1310 | char *r = p; | |
1311 | ||
1312 | *p++ = '_'; | |
1313 | *p++ = '_'; | |
1314 | if (*s == '.') | |
1315 | s++; | |
1316 | while (*s && *s != '.') | |
1317 | *p++ = *s++; | |
1318 | *p = '\0'; | |
1319 | if (*s == '.') | |
1320 | s++; | |
1321 | if (strstr(s, "rodata") != NULL) | |
1322 | strcat(p, "const "); | |
1323 | else if (strstr(s, "data") != NULL) | |
1324 | strcat(p, "data "); | |
1325 | else | |
1326 | strcat(p, " "); | |
cbcf14a9 | 1327 | return r; |
588ccd73 | 1328 | } else { |
5003bab8 | 1329 | return strdup(""); |
588ccd73 SR |
1330 | } |
1331 | } | |
1332 | ||
1333 | static int is_function(Elf_Sym *sym) | |
1334 | { | |
1335 | if (sym) | |
1336 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1337 | else | |
f666751a | 1338 | return -1; |
588ccd73 SR |
1339 | } |
1340 | ||
00759c0e RD |
1341 | static void print_section_list(const char * const list[20]) |
1342 | { | |
1343 | const char *const *s = list; | |
1344 | ||
1345 | while (*s) { | |
1346 | fprintf(stderr, "%s", *s); | |
1347 | s++; | |
1348 | if (*s) | |
1349 | fprintf(stderr, ", "); | |
1350 | } | |
1351 | fprintf(stderr, "\n"); | |
1352 | } | |
1353 | ||
356ad538 QC |
1354 | static inline void get_pretty_name(int is_func, const char** name, const char** name_p) |
1355 | { | |
1356 | switch (is_func) { | |
1357 | case 0: *name = "variable"; *name_p = ""; break; | |
1358 | case 1: *name = "function"; *name_p = "()"; break; | |
1359 | default: *name = "(unknown reference)"; *name_p = ""; break; | |
1360 | } | |
1361 | } | |
1362 | ||
58fb0d4f | 1363 | /* |
b39927cf SR |
1364 | * Print a warning about a section mismatch. |
1365 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1366 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1367 | */ |
0d2a636e UKK |
1368 | static void report_sec_mismatch(const char *modname, |
1369 | const struct sectioncheck *mismatch, | |
bb66fc67 MY |
1370 | const char *fromsec, |
1371 | unsigned long long fromaddr, | |
1372 | const char *fromsym, | |
1373 | int from_is_func, | |
1374 | const char *tosec, const char *tosym, | |
1375 | int to_is_func) | |
588ccd73 SR |
1376 | { |
1377 | const char *from, *from_p; | |
1378 | const char *to, *to_p; | |
37ed19d5 AF |
1379 | char *prl_from; |
1380 | char *prl_to; | |
f666751a | 1381 | |
e5f95c8b SR |
1382 | sec_mismatch_count++; |
1383 | if (!sec_mismatch_verbose) | |
1384 | return; | |
1385 | ||
356ad538 QC |
1386 | get_pretty_name(from_is_func, &from, &from_p); |
1387 | get_pretty_name(to_is_func, &to, &to_p); | |
1388 | ||
7c0ac495 GU |
1389 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1390 | "to the %s %s:%s%s\n", | |
1391 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1392 | tosym, to_p); | |
588ccd73 | 1393 | |
0d2a636e | 1394 | switch (mismatch->mismatch) { |
bbd3f4fb | 1395 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1396 | prl_from = sec2annotation(fromsec); |
1397 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1398 | fprintf(stderr, |
f666751a | 1399 | "The function %s%s() references\n" |
588ccd73 SR |
1400 | "the %s %s%s%s.\n" |
1401 | "This is often because %s lacks a %s\n" | |
1402 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1403 | prl_from, fromsym, |
1404 | to, prl_to, tosym, to_p, | |
1405 | fromsym, prl_to, tosym); | |
1406 | free(prl_from); | |
1407 | free(prl_to); | |
588ccd73 | 1408 | break; |
bbd3f4fb | 1409 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1410 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1411 | fprintf(stderr, |
1412 | "The variable %s references\n" | |
1413 | "the %s %s%s%s\n" | |
1414 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1415 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1416 | "or name the variable:\n", |
37ed19d5 | 1417 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1418 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1419 | free(prl_to); |
588ccd73 | 1420 | break; |
58fb0d4f | 1421 | } |
bbd3f4fb | 1422 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1423 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1424 | fprintf(stderr, |
1425 | "The function %s() references a %s in an exit section.\n" | |
1426 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1427 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1428 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1429 | free(prl_to); | |
588ccd73 | 1430 | break; |
bbd3f4fb | 1431 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1432 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1433 | fprintf(stderr, |
1434 | "The variable %s references\n" | |
1435 | "the %s %s%s%s\n" | |
1436 | "If the reference is valid then annotate the\n" | |
1437 | "variable with __exit* (see linux/init.h) or " | |
1438 | "name the variable:\n", | |
37ed19d5 | 1439 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1440 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1441 | free(prl_to); |
588ccd73 SR |
1442 | break; |
1443 | } | |
bbd3f4fb UKK |
1444 | case XXXINIT_TO_SOME_INIT: |
1445 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1446 | prl_from = sec2annotation(fromsec); |
1447 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1448 | fprintf(stderr, |
1449 | "The %s %s%s%s references\n" | |
1450 | "a %s %s%s%s.\n" | |
1451 | "If %s is only used by %s then\n" | |
1452 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1453 | from, prl_from, fromsym, from_p, |
1454 | to, prl_to, tosym, to_p, | |
b1d2675a | 1455 | tosym, fromsym, tosym); |
37ed19d5 AF |
1456 | free(prl_from); |
1457 | free(prl_to); | |
588ccd73 | 1458 | break; |
bbd3f4fb | 1459 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1460 | prl_from = sec2annotation(fromsec); |
1461 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1462 | fprintf(stderr, |
1463 | "The %s %s%s%s references\n" | |
1464 | "a %s %s%s%s.\n" | |
1465 | "This is often seen when error handling " | |
1466 | "in the init function\n" | |
1467 | "uses functionality in the exit path.\n" | |
1468 | "The fix is often to remove the %sannotation of\n" | |
1469 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1470 | from, prl_from, fromsym, from_p, |
1471 | to, prl_to, tosym, to_p, | |
5003bab8 | 1472 | prl_to, tosym, to_p); |
37ed19d5 AF |
1473 | free(prl_from); |
1474 | free(prl_to); | |
588ccd73 | 1475 | break; |
bbd3f4fb | 1476 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1477 | prl_from = sec2annotation(fromsec); |
1478 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1479 | fprintf(stderr, |
1480 | "The %s %s%s%s references\n" | |
1481 | "a %s %s%s%s.\n" | |
1482 | "This is often seen when error handling " | |
1483 | "in the exit function\n" | |
1484 | "uses functionality in the init path.\n" | |
1485 | "The fix is often to remove the %sannotation of\n" | |
1486 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1487 | from, prl_from, fromsym, from_p, |
1488 | to, prl_to, tosym, to_p, | |
1489 | prl_to, tosym, to_p); | |
1490 | free(prl_from); | |
1491 | free(prl_to); | |
588ccd73 SR |
1492 | break; |
1493 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1494 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1495 | fprintf(stderr, |
1496 | "The symbol %s is exported and annotated %s\n" | |
1497 | "Fix this by removing the %sannotation of %s " | |
1498 | "or drop the export.\n", | |
37ed19d5 AF |
1499 | tosym, prl_to, prl_to, tosym); |
1500 | free(prl_to); | |
588ccd73 | 1501 | break; |
52dc0595 QC |
1502 | case EXTABLE_TO_NON_TEXT: |
1503 | fatal("There's a special handler for this mismatch type, " | |
1504 | "we should never get here."); | |
1505 | break; | |
588ccd73 SR |
1506 | } |
1507 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1508 | } |
1509 | ||
644e8f14 QC |
1510 | static void default_mismatch_handler(const char *modname, struct elf_info *elf, |
1511 | const struct sectioncheck* const mismatch, | |
1512 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
58fb0d4f SR |
1513 | { |
1514 | const char *tosec; | |
644e8f14 QC |
1515 | Elf_Sym *to; |
1516 | Elf_Sym *from; | |
1517 | const char *tosym; | |
1518 | const char *fromsym; | |
58fb0d4f | 1519 | |
644e8f14 QC |
1520 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1521 | fromsym = sym_name(elf, from); | |
644e8f14 QC |
1522 | |
1523 | if (!strncmp(fromsym, "reference___initcall", | |
1524 | sizeof("reference___initcall")-1)) | |
1525 | return; | |
1526 | ||
c7a65e06 QC |
1527 | tosec = sec_name(elf, get_secindex(elf, sym)); |
1528 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1529 | tosym = sym_name(elf, to); | |
1530 | ||
644e8f14 QC |
1531 | /* check whitelist - we may ignore it */ |
1532 | if (secref_whitelist(mismatch, | |
1533 | fromsec, fromsym, tosec, tosym)) { | |
1534 | report_sec_mismatch(modname, mismatch, | |
1535 | fromsec, r->r_offset, fromsym, | |
1536 | is_function(from), tosec, tosym, | |
1537 | is_function(to)); | |
1538 | } | |
1539 | } | |
1540 | ||
52dc0595 QC |
1541 | static int is_executable_section(struct elf_info* elf, unsigned int section_index) |
1542 | { | |
1543 | if (section_index > elf->num_sections) | |
1544 | fatal("section_index is outside elf->num_sections!\n"); | |
1545 | ||
1546 | return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR); | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size() | |
1551 | * to know the sizeof(struct exception_table_entry) for the target architecture. | |
1552 | */ | |
1553 | static unsigned int extable_entry_size = 0; | |
e84048aa | 1554 | static void find_extable_entry_size(const char* const sec, const Elf_Rela* r) |
52dc0595 QC |
1555 | { |
1556 | /* | |
1557 | * If we're currently checking the second relocation within __ex_table, | |
1558 | * that relocation offset tells us the offsetof(struct | |
1559 | * exception_table_entry, fixup) which is equal to sizeof(struct | |
1560 | * exception_table_entry) divided by two. We use that to our advantage | |
1561 | * since there's no portable way to get that size as every architecture | |
1562 | * seems to go with different sized types. Not pretty but better than | |
1563 | * hard-coding the size for every architecture.. | |
1564 | */ | |
e84048aa | 1565 | if (!extable_entry_size) |
52dc0595 QC |
1566 | extable_entry_size = r->r_offset * 2; |
1567 | } | |
e84048aa | 1568 | |
52dc0595 QC |
1569 | static inline bool is_extable_fault_address(Elf_Rela *r) |
1570 | { | |
d3df4de7 QC |
1571 | /* |
1572 | * extable_entry_size is only discovered after we've handled the | |
1573 | * _second_ relocation in __ex_table, so only abort when we're not | |
1574 | * handling the first reloc and extable_entry_size is zero. | |
1575 | */ | |
1576 | if (r->r_offset && extable_entry_size == 0) | |
52dc0595 QC |
1577 | fatal("extable_entry size hasn't been discovered!\n"); |
1578 | ||
1579 | return ((r->r_offset == 0) || | |
1580 | (r->r_offset % extable_entry_size == 0)); | |
1581 | } | |
1582 | ||
e84048aa QC |
1583 | #define is_second_extable_reloc(Start, Cur, Sec) \ |
1584 | (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0)) | |
1585 | ||
52dc0595 QC |
1586 | static void report_extable_warnings(const char* modname, struct elf_info* elf, |
1587 | const struct sectioncheck* const mismatch, | |
1588 | Elf_Rela* r, Elf_Sym* sym, | |
1589 | const char* fromsec, const char* tosec) | |
1590 | { | |
1591 | Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec); | |
1592 | const char* fromsym_name = sym_name(elf, fromsym); | |
1593 | Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym); | |
1594 | const char* tosym_name = sym_name(elf, tosym); | |
1595 | const char* from_pretty_name; | |
1596 | const char* from_pretty_name_p; | |
1597 | const char* to_pretty_name; | |
1598 | const char* to_pretty_name_p; | |
1599 | ||
1600 | get_pretty_name(is_function(fromsym), | |
1601 | &from_pretty_name, &from_pretty_name_p); | |
1602 | get_pretty_name(is_function(tosym), | |
1603 | &to_pretty_name, &to_pretty_name_p); | |
1604 | ||
1605 | warn("%s(%s+0x%lx): Section mismatch in reference" | |
1606 | " from the %s %s%s to the %s %s:%s%s\n", | |
1607 | modname, fromsec, (long)r->r_offset, from_pretty_name, | |
1608 | fromsym_name, from_pretty_name_p, | |
1609 | to_pretty_name, tosec, tosym_name, to_pretty_name_p); | |
1610 | ||
1611 | if (!match(tosec, mismatch->bad_tosec) && | |
1612 | is_executable_section(elf, get_secindex(elf, sym))) | |
1613 | fprintf(stderr, | |
1614 | "The relocation at %s+0x%lx references\n" | |
1615 | "section \"%s\" which is not in the list of\n" | |
1616 | "authorized sections. If you're adding a new section\n" | |
1617 | "and/or if this reference is valid, add \"%s\" to the\n" | |
1618 | "list of authorized sections to jump to on fault.\n" | |
1619 | "This can be achieved by adding \"%s\" to \n" | |
1620 | "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n", | |
1621 | fromsec, (long)r->r_offset, tosec, tosec, tosec); | |
1622 | } | |
1623 | ||
1624 | static void extable_mismatch_handler(const char* modname, struct elf_info *elf, | |
1625 | const struct sectioncheck* const mismatch, | |
1626 | Elf_Rela* r, Elf_Sym* sym, | |
1627 | const char *fromsec) | |
1628 | { | |
1629 | const char* tosec = sec_name(elf, get_secindex(elf, sym)); | |
1630 | ||
1631 | sec_mismatch_count++; | |
1632 | ||
1633 | if (sec_mismatch_verbose) | |
1634 | report_extable_warnings(modname, elf, mismatch, r, sym, | |
1635 | fromsec, tosec); | |
1636 | ||
1637 | if (match(tosec, mismatch->bad_tosec)) | |
1638 | fatal("The relocation at %s+0x%lx references\n" | |
1639 | "section \"%s\" which is black-listed.\n" | |
1640 | "Something is seriously wrong and should be fixed.\n" | |
1641 | "You might get more information about where this is\n" | |
1642 | "coming from by using scripts/check_extable.sh %s\n", | |
1643 | fromsec, (long)r->r_offset, tosec, modname); | |
1644 | else if (!is_executable_section(elf, get_secindex(elf, sym))) { | |
1645 | if (is_extable_fault_address(r)) | |
1646 | fatal("The relocation at %s+0x%lx references\n" | |
1647 | "section \"%s\" which is not executable, IOW\n" | |
1648 | "it is not possible for the kernel to fault\n" | |
1649 | "at that address. Something is seriously wrong\n" | |
1650 | "and should be fixed.\n", | |
1651 | fromsec, (long)r->r_offset, tosec); | |
1652 | else | |
1653 | fatal("The relocation at %s+0x%lx references\n" | |
1654 | "section \"%s\" which is not executable, IOW\n" | |
1655 | "the kernel will fault if it ever tries to\n" | |
1656 | "jump to it. Something is seriously wrong\n" | |
1657 | "and should be fixed.\n", | |
1658 | fromsec, (long)r->r_offset, tosec); | |
1659 | } | |
1660 | } | |
1661 | ||
644e8f14 QC |
1662 | static void check_section_mismatch(const char *modname, struct elf_info *elf, |
1663 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1664 | { | |
1665 | const char *tosec = sec_name(elf, get_secindex(elf, sym));; | |
1666 | const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec); | |
1667 | ||
0d2a636e | 1668 | if (mismatch) { |
644e8f14 QC |
1669 | if (mismatch->handler) |
1670 | mismatch->handler(modname, elf, mismatch, | |
1671 | r, sym, fromsec); | |
1672 | else | |
1673 | default_mismatch_handler(modname, elf, mismatch, | |
1674 | r, sym, fromsec); | |
b39927cf SR |
1675 | } |
1676 | } | |
1677 | ||
ae4ac123 | 1678 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1679 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1680 | { |
1681 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1682 | int section = sechdr->sh_info; |
ae4ac123 AN |
1683 | |
1684 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1685 | r->r_offset; |
ae4ac123 AN |
1686 | } |
1687 | ||
5b24c071 | 1688 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1689 | { |
1690 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1691 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1692 | |
1693 | switch (r_typ) { | |
1694 | case R_386_32: | |
1695 | r->r_addend = TO_NATIVE(*location); | |
1696 | break; | |
1697 | case R_386_PC32: | |
1698 | r->r_addend = TO_NATIVE(*location) + 4; | |
1699 | /* For CONFIG_RELOCATABLE=y */ | |
1700 | if (elf->hdr->e_type == ET_EXEC) | |
1701 | r->r_addend += r->r_offset; | |
1702 | break; | |
1703 | } | |
1704 | return 0; | |
1705 | } | |
1706 | ||
6e2e340b TL |
1707 | #ifndef R_ARM_CALL |
1708 | #define R_ARM_CALL 28 | |
1709 | #endif | |
1710 | #ifndef R_ARM_JUMP24 | |
1711 | #define R_ARM_JUMP24 29 | |
1712 | #endif | |
1713 | ||
c9698e5c DL |
1714 | #ifndef R_ARM_THM_CALL |
1715 | #define R_ARM_THM_CALL 10 | |
1716 | #endif | |
1717 | #ifndef R_ARM_THM_JUMP24 | |
1718 | #define R_ARM_THM_JUMP24 30 | |
1719 | #endif | |
1720 | #ifndef R_ARM_THM_JUMP19 | |
1721 | #define R_ARM_THM_JUMP19 51 | |
1722 | #endif | |
1723 | ||
5b24c071 | 1724 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1725 | { |
1726 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1727 | ||
1728 | switch (r_typ) { | |
1729 | case R_ARM_ABS32: | |
1730 | /* From ARM ABI: (S + A) | T */ | |
df578e7d | 1731 | r->r_addend = (int)(long) |
bb66fc67 | 1732 | (elf->symtab_start + ELF_R_SYM(r->r_info)); |
56a974fa SR |
1733 | break; |
1734 | case R_ARM_PC24: | |
6e2e340b TL |
1735 | case R_ARM_CALL: |
1736 | case R_ARM_JUMP24: | |
c9698e5c DL |
1737 | case R_ARM_THM_CALL: |
1738 | case R_ARM_THM_JUMP24: | |
1739 | case R_ARM_THM_JUMP19: | |
56a974fa | 1740 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1741 | r->r_addend = (int)(long)(elf->hdr + |
bb66fc67 MY |
1742 | sechdr->sh_offset + |
1743 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1744 | break; |
1745 | default: | |
1746 | return 1; | |
1747 | } | |
1748 | return 0; | |
1749 | } | |
1750 | ||
5b24c071 | 1751 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1752 | { |
1753 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1754 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1755 | unsigned int inst; |
1756 | ||
1757 | if (r_typ == R_MIPS_HI16) | |
1758 | return 1; /* skip this */ | |
1759 | inst = TO_NATIVE(*location); | |
1760 | switch (r_typ) { | |
1761 | case R_MIPS_LO16: | |
1762 | r->r_addend = inst & 0xffff; | |
1763 | break; | |
1764 | case R_MIPS_26: | |
1765 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1766 | break; | |
1767 | case R_MIPS_32: | |
1768 | r->r_addend = inst; | |
1769 | break; | |
1770 | } | |
1771 | return 0; | |
1772 | } | |
1773 | ||
5b24c071 | 1774 | static void section_rela(const char *modname, struct elf_info *elf, |
bb66fc67 | 1775 | Elf_Shdr *sechdr) |
5b24c071 SR |
1776 | { |
1777 | Elf_Sym *sym; | |
1778 | Elf_Rela *rela; | |
1779 | Elf_Rela r; | |
1780 | unsigned int r_sym; | |
1781 | const char *fromsec; | |
5b24c071 | 1782 | |
ff13f926 | 1783 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1784 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1785 | ||
ff13f926 | 1786 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1787 | fromsec += strlen(".rela"); |
1788 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1789 | if (match(fromsec, section_white_list)) |
5b24c071 | 1790 | return; |
e241a630 | 1791 | |
5b24c071 SR |
1792 | for (rela = start; rela < stop; rela++) { |
1793 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1794 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1795 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1796 | unsigned int r_typ; |
1797 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1798 | r_sym = TO_NATIVE(r_sym); | |
1799 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1800 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1801 | } else { | |
1802 | r.r_info = TO_NATIVE(rela->r_info); | |
1803 | r_sym = ELF_R_SYM(r.r_info); | |
1804 | } | |
1805 | #else | |
1806 | r.r_info = TO_NATIVE(rela->r_info); | |
1807 | r_sym = ELF_R_SYM(r.r_info); | |
1808 | #endif | |
1809 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1810 | sym = elf->symtab_start + r_sym; | |
1811 | /* Skip special sections */ | |
1ce53adf | 1812 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1813 | continue; |
e84048aa QC |
1814 | if (is_second_extable_reloc(start, rela, fromsec)) |
1815 | find_extable_entry_size(fromsec, &r); | |
58fb0d4f | 1816 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1817 | } |
1818 | } | |
1819 | ||
1820 | static void section_rel(const char *modname, struct elf_info *elf, | |
bb66fc67 | 1821 | Elf_Shdr *sechdr) |
5b24c071 SR |
1822 | { |
1823 | Elf_Sym *sym; | |
1824 | Elf_Rel *rel; | |
1825 | Elf_Rela r; | |
1826 | unsigned int r_sym; | |
1827 | const char *fromsec; | |
5b24c071 | 1828 | |
ff13f926 | 1829 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1830 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1831 | ||
ff13f926 | 1832 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1833 | fromsec += strlen(".rel"); |
1834 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1835 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1836 | return; |
1837 | ||
1838 | for (rel = start; rel < stop; rel++) { | |
1839 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1840 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1841 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1842 | unsigned int r_typ; |
1843 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1844 | r_sym = TO_NATIVE(r_sym); | |
1845 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1846 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1847 | } else { | |
1848 | r.r_info = TO_NATIVE(rel->r_info); | |
1849 | r_sym = ELF_R_SYM(r.r_info); | |
1850 | } | |
1851 | #else | |
1852 | r.r_info = TO_NATIVE(rel->r_info); | |
1853 | r_sym = ELF_R_SYM(r.r_info); | |
1854 | #endif | |
1855 | r.r_addend = 0; | |
ff13f926 | 1856 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1857 | case EM_386: |
1858 | if (addend_386_rel(elf, sechdr, &r)) | |
1859 | continue; | |
1860 | break; | |
1861 | case EM_ARM: | |
1862 | if (addend_arm_rel(elf, sechdr, &r)) | |
1863 | continue; | |
1864 | break; | |
1865 | case EM_MIPS: | |
1866 | if (addend_mips_rel(elf, sechdr, &r)) | |
1867 | continue; | |
1868 | break; | |
1869 | } | |
1870 | sym = elf->symtab_start + r_sym; | |
1871 | /* Skip special sections */ | |
1ce53adf | 1872 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1873 | continue; |
e84048aa QC |
1874 | if (is_second_extable_reloc(start, rel, fromsec)) |
1875 | find_extable_entry_size(fromsec, &r); | |
58fb0d4f | 1876 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1877 | } |
1878 | } | |
1879 | ||
b39927cf SR |
1880 | /** |
1881 | * A module includes a number of sections that are discarded | |
1882 | * either when loaded or when used as built-in. | |
1883 | * For loaded modules all functions marked __init and all data | |
b595076a | 1884 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1885 | * Likewise for modules used built-in the sections marked __exit |
1886 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1887 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1888 | * The check_sec_ref() function traverses all relocation records |
1889 | * to find all references to a section that reference a section that will | |
1890 | * be discarded and warns about it. | |
1891 | **/ | |
1892 | static void check_sec_ref(struct module *mod, const char *modname, | |
bb66fc67 | 1893 | struct elf_info *elf) |
b39927cf SR |
1894 | { |
1895 | int i; | |
b39927cf | 1896 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1897 | |
b39927cf | 1898 | /* Walk through all sections */ |
1ce53adf | 1899 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1900 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1901 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1902 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1903 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1904 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1905 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1906 | } |
1907 | } | |
1908 | ||
7d02b490 AK |
1909 | static char *remove_dot(char *s) |
1910 | { | |
fcd38ed0 | 1911 | size_t n = strcspn(s, "."); |
7d02b490 | 1912 | |
fcd38ed0 MN |
1913 | if (n && s[n]) { |
1914 | size_t m = strspn(s + n + 1, "0123456789"); | |
1915 | if (m && (s[n + m] == '.' || s[n + m] == 0)) | |
7d02b490 AK |
1916 | s[n] = 0; |
1917 | } | |
1918 | return s; | |
1919 | } | |
1920 | ||
5c3ead8c | 1921 | static void read_symbols(char *modname) |
1da177e4 LT |
1922 | { |
1923 | const char *symname; | |
1924 | char *version; | |
b817f6fe | 1925 | char *license; |
1da177e4 LT |
1926 | struct module *mod; |
1927 | struct elf_info info = { }; | |
1928 | Elf_Sym *sym; | |
1929 | ||
85bd2fdd SR |
1930 | if (!parse_elf(&info, modname)) |
1931 | return; | |
1da177e4 LT |
1932 | |
1933 | mod = new_module(modname); | |
1934 | ||
1935 | /* When there's no vmlinux, don't print warnings about | |
1936 | * unresolved symbols (since there'll be too many ;) */ | |
1937 | if (is_vmlinux(modname)) { | |
1da177e4 | 1938 | have_vmlinux = 1; |
1da177e4 LT |
1939 | mod->skip = 1; |
1940 | } | |
1941 | ||
b817f6fe | 1942 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1943 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1944 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1945 | "see include/linux/module.h for " | |
1946 | "more information\n", modname); | |
b817f6fe SR |
1947 | while (license) { |
1948 | if (license_is_gpl_compatible(license)) | |
1949 | mod->gpl_compatible = 1; | |
1950 | else { | |
1951 | mod->gpl_compatible = 0; | |
1952 | break; | |
1953 | } | |
1954 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1955 | "license", license); | |
1956 | } | |
1957 | ||
1da177e4 | 1958 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
7d02b490 | 1959 | symname = remove_dot(info.strtab + sym->st_name); |
1da177e4 LT |
1960 | |
1961 | handle_modversions(mod, &info, sym, symname); | |
1962 | handle_moddevtable(mod, &info, sym, symname); | |
1963 | } | |
d1f25e66 | 1964 | if (!is_vmlinux(modname) || |
10668220 SR |
1965 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1966 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1967 | |
1968 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1969 | if (version) | |
1970 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1971 | version - (char *)info.hdr); | |
1972 | if (version || (all_versions && !is_vmlinux(modname))) | |
1973 | get_src_version(modname, mod->srcversion, | |
1974 | sizeof(mod->srcversion)-1); | |
1975 | ||
1976 | parse_elf_finish(&info); | |
1977 | ||
8c8ef42a | 1978 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1979 | * never passed as an argument to an exported function, so |
1980 | * the automatic versioning doesn't pick it up, but it's really | |
1981 | * important anyhow */ | |
1982 | if (modversions) | |
8c8ef42a | 1983 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1984 | } |
1985 | ||
712f9b46 RR |
1986 | static void read_symbols_from_files(const char *filename) |
1987 | { | |
1988 | FILE *in = stdin; | |
1989 | char fname[PATH_MAX]; | |
1990 | ||
1991 | if (strcmp(filename, "-") != 0) { | |
1992 | in = fopen(filename, "r"); | |
1993 | if (!in) | |
1994 | fatal("Can't open filenames file %s: %m", filename); | |
1995 | } | |
1996 | ||
1997 | while (fgets(fname, PATH_MAX, in) != NULL) { | |
1998 | if (strends(fname, "\n")) | |
1999 | fname[strlen(fname)-1] = '\0'; | |
2000 | read_symbols(fname); | |
2001 | } | |
2002 | ||
2003 | if (in != stdin) | |
2004 | fclose(in); | |
2005 | } | |
2006 | ||
1da177e4 LT |
2007 | #define SZ 500 |
2008 | ||
2009 | /* We first write the generated file into memory using the | |
2010 | * following helper, then compare to the file on disk and | |
2011 | * only update the later if anything changed */ | |
2012 | ||
5c3ead8c SR |
2013 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
2014 | const char *fmt, ...) | |
1da177e4 LT |
2015 | { |
2016 | char tmp[SZ]; | |
2017 | int len; | |
2018 | va_list ap; | |
62070fa4 | 2019 | |
1da177e4 LT |
2020 | va_start(ap, fmt); |
2021 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 2022 | buf_write(buf, tmp, len); |
1da177e4 LT |
2023 | va_end(ap); |
2024 | } | |
2025 | ||
5c3ead8c | 2026 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
2027 | { |
2028 | if (buf->size - buf->pos < len) { | |
7670f023 | 2029 | buf->size += len + SZ; |
1da177e4 LT |
2030 | buf->p = realloc(buf->p, buf->size); |
2031 | } | |
2032 | strncpy(buf->p + buf->pos, s, len); | |
2033 | buf->pos += len; | |
2034 | } | |
2035 | ||
c96fca21 SR |
2036 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
2037 | { | |
2038 | const char *e = is_vmlinux(m) ?"":".ko"; | |
2039 | ||
2040 | switch (exp) { | |
2041 | case export_gpl: | |
2042 | fatal("modpost: GPL-incompatible module %s%s " | |
2043 | "uses GPL-only symbol '%s'\n", m, e, s); | |
2044 | break; | |
2045 | case export_unused_gpl: | |
2046 | fatal("modpost: GPL-incompatible module %s%s " | |
2047 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
2048 | break; | |
2049 | case export_gpl_future: | |
2050 | warn("modpost: GPL-incompatible module %s%s " | |
2051 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
2052 | break; | |
2053 | case export_plain: | |
2054 | case export_unused: | |
2055 | case export_unknown: | |
2056 | /* ignore */ | |
2057 | break; | |
2058 | } | |
2059 | } | |
2060 | ||
df578e7d | 2061 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
2062 | { |
2063 | const char *e = is_vmlinux(m) ?"":".ko"; | |
2064 | ||
2065 | switch (exp) { | |
2066 | case export_unused: | |
2067 | case export_unused_gpl: | |
2068 | warn("modpost: module %s%s " | |
2069 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
2070 | break; | |
2071 | default: | |
2072 | /* ignore */ | |
2073 | break; | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | static void check_exports(struct module *mod) | |
b817f6fe SR |
2078 | { |
2079 | struct symbol *s, *exp; | |
2080 | ||
2081 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 2082 | const char *basename; |
b817f6fe SR |
2083 | exp = find_symbol(s->name); |
2084 | if (!exp || exp->module == mod) | |
2085 | continue; | |
6449bd62 | 2086 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
2087 | if (basename) |
2088 | basename++; | |
c96fca21 SR |
2089 | else |
2090 | basename = mod->name; | |
2091 | if (!mod->gpl_compatible) | |
2092 | check_for_gpl_usage(exp->export, basename, exp->name); | |
2093 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 2094 | } |
b817f6fe SR |
2095 | } |
2096 | ||
5c3ead8c SR |
2097 | /** |
2098 | * Header for the generated file | |
2099 | **/ | |
2100 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
2101 | { |
2102 | buf_printf(b, "#include <linux/module.h>\n"); | |
2103 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
2104 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
2105 | buf_printf(b, "\n"); | |
2106 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
2107 | buf_printf(b, "\n"); | |
e0f244c6 | 2108 | buf_printf(b, "__visible struct module __this_module\n"); |
1da177e4 | 2109 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
3c7ec94d | 2110 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 2111 | if (mod->has_init) |
3c7ec94d | 2112 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
2113 | if (mod->has_cleanup) |
2114 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 2115 | "\t.exit = cleanup_module,\n" |
1da177e4 | 2116 | "#endif\n"); |
3c7ec94d | 2117 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
2118 | buf_printf(b, "};\n"); |
2119 | } | |
2120 | ||
2449b8ba BH |
2121 | static void add_intree_flag(struct buffer *b, int is_intree) |
2122 | { | |
2123 | if (is_intree) | |
2124 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
2125 | } | |
2126 | ||
5c725138 | 2127 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
2128 | { |
2129 | static const char *staging_dir = "drivers/staging"; | |
2130 | ||
2131 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
2132 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
2133 | } | |
2134 | ||
5c3ead8c SR |
2135 | /** |
2136 | * Record CRCs for unresolved symbols | |
2137 | **/ | |
c53ddacd | 2138 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
2139 | { |
2140 | struct symbol *s, *exp; | |
c53ddacd | 2141 | int err = 0; |
1da177e4 LT |
2142 | |
2143 | for (s = mod->unres; s; s = s->next) { | |
2144 | exp = find_symbol(s->name); | |
2145 | if (!exp || exp->module == mod) { | |
c53ddacd | 2146 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
2147 | if (warn_unresolved) { |
2148 | warn("\"%s\" [%s.ko] undefined!\n", | |
2149 | s->name, mod->name); | |
2150 | } else { | |
2151 | merror("\"%s\" [%s.ko] undefined!\n", | |
bb66fc67 | 2152 | s->name, mod->name); |
2a116659 MW |
2153 | err = 1; |
2154 | } | |
c53ddacd | 2155 | } |
1da177e4 LT |
2156 | continue; |
2157 | } | |
2158 | s->module = exp->module; | |
2159 | s->crc_valid = exp->crc_valid; | |
2160 | s->crc = exp->crc; | |
2161 | } | |
2162 | ||
2163 | if (!modversions) | |
c53ddacd | 2164 | return err; |
1da177e4 LT |
2165 | |
2166 | buf_printf(b, "\n"); | |
2167 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 2168 | buf_printf(b, "__used\n"); |
1da177e4 LT |
2169 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
2170 | ||
2171 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 2172 | if (!s->module) |
1da177e4 | 2173 | continue; |
1da177e4 | 2174 | if (!s->crc_valid) { |
cb80514d | 2175 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
2176 | s->name, mod->name); |
2177 | continue; | |
2178 | } | |
a53a11f3 | 2179 | buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", |
a4b6a77b | 2180 | s->crc, s->name); |
1da177e4 LT |
2181 | } |
2182 | ||
2183 | buf_printf(b, "};\n"); | |
c53ddacd KK |
2184 | |
2185 | return err; | |
1da177e4 LT |
2186 | } |
2187 | ||
5c3ead8c SR |
2188 | static void add_depends(struct buffer *b, struct module *mod, |
2189 | struct module *modules) | |
1da177e4 LT |
2190 | { |
2191 | struct symbol *s; | |
2192 | struct module *m; | |
2193 | int first = 1; | |
2194 | ||
df578e7d | 2195 | for (m = modules; m; m = m->next) |
1da177e4 | 2196 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
2197 | |
2198 | buf_printf(b, "\n"); | |
2199 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 2200 | buf_printf(b, "__used\n"); |
1da177e4 LT |
2201 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
2202 | buf_printf(b, "\"depends="); | |
2203 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 2204 | const char *p; |
1da177e4 LT |
2205 | if (!s->module) |
2206 | continue; | |
2207 | ||
2208 | if (s->module->seen) | |
2209 | continue; | |
2210 | ||
2211 | s->module->seen = 1; | |
df578e7d SR |
2212 | p = strrchr(s->module->name, '/'); |
2213 | if (p) | |
a61b2dfd SR |
2214 | p++; |
2215 | else | |
2216 | p = s->module->name; | |
2217 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
2218 | first = 0; |
2219 | } | |
2220 | buf_printf(b, "\";\n"); | |
2221 | } | |
2222 | ||
5c3ead8c | 2223 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
2224 | { |
2225 | if (mod->srcversion[0]) { | |
2226 | buf_printf(b, "\n"); | |
2227 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
2228 | mod->srcversion); | |
2229 | } | |
2230 | } | |
2231 | ||
5c3ead8c | 2232 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
2233 | { |
2234 | char *tmp; | |
2235 | FILE *file; | |
2236 | struct stat st; | |
2237 | ||
2238 | file = fopen(fname, "r"); | |
2239 | if (!file) | |
2240 | goto write; | |
2241 | ||
2242 | if (fstat(fileno(file), &st) < 0) | |
2243 | goto close_write; | |
2244 | ||
2245 | if (st.st_size != b->pos) | |
2246 | goto close_write; | |
2247 | ||
2248 | tmp = NOFAIL(malloc(b->pos)); | |
2249 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
2250 | goto free_write; | |
2251 | ||
2252 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2253 | goto free_write; | |
2254 | ||
2255 | free(tmp); | |
2256 | fclose(file); | |
2257 | return; | |
2258 | ||
2259 | free_write: | |
2260 | free(tmp); | |
2261 | close_write: | |
2262 | fclose(file); | |
2263 | write: | |
2264 | file = fopen(fname, "w"); | |
2265 | if (!file) { | |
2266 | perror(fname); | |
2267 | exit(1); | |
2268 | } | |
2269 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2270 | perror(fname); | |
2271 | exit(1); | |
2272 | } | |
2273 | fclose(file); | |
2274 | } | |
2275 | ||
bd5cbced | 2276 | /* parse Module.symvers file. line format: |
534b89a9 | 2277 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2278 | **/ |
040fcc81 | 2279 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2280 | { |
2281 | unsigned long size, pos = 0; | |
2282 | void *file = grab_file(fname, &size); | |
2283 | char *line; | |
2284 | ||
df578e7d | 2285 | if (!file) |
1da177e4 LT |
2286 | /* No symbol versions, silently ignore */ |
2287 | return; | |
2288 | ||
2289 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2290 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2291 | unsigned int crc; |
2292 | struct module *mod; | |
040fcc81 | 2293 | struct symbol *s; |
1da177e4 LT |
2294 | |
2295 | if (!(symname = strchr(line, '\t'))) | |
2296 | goto fail; | |
2297 | *symname++ = '\0'; | |
2298 | if (!(modname = strchr(symname, '\t'))) | |
2299 | goto fail; | |
2300 | *modname++ = '\0'; | |
9ac545b0 | 2301 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2302 | *export++ = '\0'; |
534b89a9 SR |
2303 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2304 | *end = '\0'; | |
1da177e4 LT |
2305 | crc = strtoul(line, &d, 16); |
2306 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2307 | goto fail; | |
df578e7d SR |
2308 | mod = find_module(modname); |
2309 | if (!mod) { | |
2310 | if (is_vmlinux(modname)) | |
1da177e4 | 2311 | have_vmlinux = 1; |
0fa3a88c | 2312 | mod = new_module(modname); |
1da177e4 LT |
2313 | mod->skip = 1; |
2314 | } | |
bd5cbced | 2315 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2316 | s->kernel = kernel; |
2317 | s->preloaded = 1; | |
bd5cbced | 2318 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 | 2319 | } |
2ee41e62 | 2320 | release_file(file, size); |
1da177e4 LT |
2321 | return; |
2322 | fail: | |
2ee41e62 | 2323 | release_file(file, size); |
1da177e4 LT |
2324 | fatal("parse error in symbol dump file\n"); |
2325 | } | |
2326 | ||
040fcc81 SR |
2327 | /* For normal builds always dump all symbols. |
2328 | * For external modules only dump symbols | |
2329 | * that are not read from kernel Module.symvers. | |
2330 | **/ | |
2331 | static int dump_sym(struct symbol *sym) | |
2332 | { | |
2333 | if (!external_module) | |
2334 | return 1; | |
2335 | if (sym->vmlinux || sym->kernel) | |
2336 | return 0; | |
2337 | return 1; | |
2338 | } | |
62070fa4 | 2339 | |
5c3ead8c | 2340 | static void write_dump(const char *fname) |
1da177e4 LT |
2341 | { |
2342 | struct buffer buf = { }; | |
2343 | struct symbol *symbol; | |
2344 | int n; | |
2345 | ||
2346 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2347 | symbol = symbolhash[n]; | |
2348 | while (symbol) { | |
040fcc81 | 2349 | if (dump_sym(symbol)) |
bd5cbced | 2350 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2351 | symbol->crc, symbol->name, |
bd5cbced RP |
2352 | symbol->module->name, |
2353 | export_str(symbol->export)); | |
1da177e4 LT |
2354 | symbol = symbol->next; |
2355 | } | |
2356 | } | |
2357 | write_if_changed(&buf, fname); | |
2358 | } | |
2359 | ||
2d04b5ae RH |
2360 | struct ext_sym_list { |
2361 | struct ext_sym_list *next; | |
2362 | const char *file; | |
2363 | }; | |
2364 | ||
5c3ead8c | 2365 | int main(int argc, char **argv) |
1da177e4 LT |
2366 | { |
2367 | struct module *mod; | |
2368 | struct buffer buf = { }; | |
040fcc81 | 2369 | char *kernel_read = NULL, *module_read = NULL; |
712f9b46 | 2370 | char *dump_write = NULL, *files_source = NULL; |
1da177e4 | 2371 | int opt; |
c53ddacd | 2372 | int err; |
2d04b5ae RH |
2373 | struct ext_sym_list *extsym_iter; |
2374 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2375 | |
eed380f3 | 2376 | while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:")) != -1) { |
df578e7d SR |
2377 | switch (opt) { |
2378 | case 'i': | |
2379 | kernel_read = optarg; | |
2380 | break; | |
2381 | case 'I': | |
2382 | module_read = optarg; | |
2383 | external_module = 1; | |
2384 | break; | |
2d04b5ae RH |
2385 | case 'e': |
2386 | external_module = 1; | |
2387 | extsym_iter = | |
2388 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2389 | extsym_iter->next = extsym_start; | |
2390 | extsym_iter->file = optarg; | |
2391 | extsym_start = extsym_iter; | |
2392 | break; | |
df578e7d SR |
2393 | case 'm': |
2394 | modversions = 1; | |
2395 | break; | |
eed380f3 GR |
2396 | case 'n': |
2397 | ignore_missing_files = 1; | |
2398 | break; | |
df578e7d SR |
2399 | case 'o': |
2400 | dump_write = optarg; | |
2401 | break; | |
2402 | case 'a': | |
2403 | all_versions = 1; | |
2404 | break; | |
2405 | case 's': | |
2406 | vmlinux_section_warnings = 0; | |
2407 | break; | |
588ccd73 SR |
2408 | case 'S': |
2409 | sec_mismatch_verbose = 0; | |
2410 | break; | |
712f9b46 RR |
2411 | case 'T': |
2412 | files_source = optarg; | |
2413 | break; | |
df578e7d SR |
2414 | case 'w': |
2415 | warn_unresolved = 1; | |
2416 | break; | |
2417 | default: | |
2418 | exit(1); | |
1da177e4 LT |
2419 | } |
2420 | } | |
2421 | ||
040fcc81 SR |
2422 | if (kernel_read) |
2423 | read_dump(kernel_read, 1); | |
2424 | if (module_read) | |
2425 | read_dump(module_read, 0); | |
2d04b5ae RH |
2426 | while (extsym_start) { |
2427 | read_dump(extsym_start->file, 0); | |
2428 | extsym_iter = extsym_start->next; | |
2429 | free(extsym_start); | |
2430 | extsym_start = extsym_iter; | |
2431 | } | |
1da177e4 | 2432 | |
df578e7d | 2433 | while (optind < argc) |
1da177e4 | 2434 | read_symbols(argv[optind++]); |
1da177e4 | 2435 | |
712f9b46 RR |
2436 | if (files_source) |
2437 | read_symbols_from_files(files_source); | |
2438 | ||
b817f6fe SR |
2439 | for (mod = modules; mod; mod = mod->next) { |
2440 | if (mod->skip) | |
2441 | continue; | |
c96fca21 | 2442 | check_exports(mod); |
b817f6fe SR |
2443 | } |
2444 | ||
c53ddacd KK |
2445 | err = 0; |
2446 | ||
1da177e4 | 2447 | for (mod = modules; mod; mod = mod->next) { |
d93e1719 | 2448 | char fname[PATH_MAX]; |
666ab414 | 2449 | |
1da177e4 LT |
2450 | if (mod->skip) |
2451 | continue; | |
2452 | ||
2453 | buf.pos = 0; | |
2454 | ||
2455 | add_header(&buf, mod); | |
2449b8ba | 2456 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2457 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2458 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2459 | add_depends(&buf, mod, modules); |
2460 | add_moddevtable(&buf, mod); | |
2461 | add_srcversion(&buf, mod); | |
2462 | ||
2463 | sprintf(fname, "%s.mod.c", mod->name); | |
2464 | write_if_changed(&buf, fname); | |
2465 | } | |
2466 | ||
2467 | if (dump_write) | |
2468 | write_dump(dump_write); | |
588ccd73 | 2469 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2470 | warn("modpost: Found %d section mismatch(es).\n" |
2471 | "To see full details build your kernel with:\n" | |
2472 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2473 | sec_mismatch_count); | |
1da177e4 | 2474 | |
c53ddacd | 2475 | return err; |
1da177e4 | 2476 | } |