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 LT |
26 | /* Are we using CONFIG_MODVERSIONS? */ |
27 | int modversions = 0; | |
28 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
29 | int have_vmlinux = 0; | |
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 | ||
bd5cbced RP |
232 | static struct { |
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 | /* if sym is empty or point to a string |
776 | * like ".[0-9]+" then return 1. | |
777 | * This is the optional prefix added by ld to some sections | |
778 | */ | |
779 | static int number_prefix(const char *sym) | |
780 | { | |
781 | if (*sym++ == '\0') | |
782 | return 1; | |
783 | if (*sym != '.') | |
784 | return 0; | |
785 | do { | |
786 | char c = *sym++; | |
787 | if (c < '0' || c > '9') | |
788 | return 0; | |
789 | } while (*sym); | |
790 | return 1; | |
791 | } | |
792 | ||
793 | /* The pattern is an array of simple patterns. | |
794 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 795 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
796 | * "foo*" will match a string that begins with "foo" |
797 | * "foo$" will match a string equal to "foo" or "foo.1" | |
798 | * where the '1' can be any number including several digits. | |
799 | * The $ syntax is for sections where ld append a dot number | |
800 | * to make section name unique. | |
801 | */ | |
5c725138 | 802 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
803 | { |
804 | const char *p; | |
805 | while (*pat) { | |
806 | p = *pat++; | |
807 | const char *endp = p + strlen(p) - 1; | |
808 | ||
6c5bd235 SR |
809 | /* "*foo" */ |
810 | if (*p == '*') { | |
811 | if (strrcmp(sym, p + 1) == 0) | |
812 | return 1; | |
813 | } | |
10668220 | 814 | /* "foo*" */ |
6c5bd235 | 815 | else if (*endp == '*') { |
10668220 SR |
816 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
817 | return 1; | |
818 | } | |
819 | /* "foo$" */ | |
820 | else if (*endp == '$') { | |
821 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
822 | if (number_prefix(sym + strlen(p) - 1)) | |
823 | return 1; | |
824 | } | |
825 | } | |
826 | /* no wildcards */ | |
827 | else { | |
828 | if (strcmp(p, sym) == 0) | |
829 | return 1; | |
830 | } | |
831 | } | |
832 | /* no match */ | |
833 | return 0; | |
834 | } | |
835 | ||
10668220 SR |
836 | /* sections that we do not want to do full section mismatch check on */ |
837 | static const char *section_white_list[] = | |
4391ed6a SR |
838 | { |
839 | ".comment*", | |
840 | ".debug*", | |
4d10c223 | 841 | ".cranges", /* sh64 */ |
1121584f | 842 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 843 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 844 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
845 | ".mdebug*", /* alpha, score, mips etc. */ |
846 | ".pdr", /* alpha, score, mips etc. */ | |
847 | ".stab*", | |
848 | ".note*", | |
849 | ".got*", | |
850 | ".toc*", | |
af42e970 MF |
851 | ".xt.prop", /* xtensa */ |
852 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
853 | ".arcextmap*", /* arc */ |
854 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
ef178f92 | 855 | ".gnu.lto*", |
4391ed6a SR |
856 | NULL |
857 | }; | |
10668220 | 858 | |
e241a630 | 859 | /* |
b614a697 | 860 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 861 | * The cause of this is often a section specified in assembler |
b614a697 | 862 | * without "ax" / "aw". |
e241a630 | 863 | */ |
b614a697 AK |
864 | static void check_section(const char *modname, struct elf_info *elf, |
865 | Elf_Shdr *sechdr) | |
e241a630 | 866 | { |
b614a697 AK |
867 | const char *sec = sech_name(elf, sechdr); |
868 | ||
869 | if (sechdr->sh_type == SHT_PROGBITS && | |
870 | !(sechdr->sh_flags & SHF_ALLOC) && | |
871 | !match(sec, section_white_list)) { | |
872 | warn("%s (%s): unexpected non-allocatable section.\n" | |
873 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
874 | "Note that for example <linux/init.h> contains\n" | |
875 | "section definitions for use in .S files.\n\n", | |
876 | modname, sec); | |
e241a630 | 877 | } |
e241a630 SR |
878 | } |
879 | ||
880 | ||
881 | ||
eb8f6890 | 882 | #define ALL_INIT_DATA_SECTIONS \ |
e24f6628 PG |
883 | ".init.setup$", ".init.rodata$", ".meminit.rodata$", \ |
884 | ".init.data$", ".meminit.data$" | |
eb8f6890 | 885 | #define ALL_EXIT_DATA_SECTIONS \ |
e24f6628 | 886 | ".exit.data$", ".memexit.data$" |
10668220 | 887 | |
eb8f6890 | 888 | #define ALL_INIT_TEXT_SECTIONS \ |
e24f6628 | 889 | ".init.text$", ".meminit.text$" |
eb8f6890 | 890 | #define ALL_EXIT_TEXT_SECTIONS \ |
e24f6628 | 891 | ".exit.text$", ".memexit.text$" |
10668220 | 892 | |
bb15d8db SAS |
893 | #define ALL_PCI_INIT_SECTIONS \ |
894 | ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \ | |
895 | ".pci_fixup_enable$", ".pci_fixup_resume$", \ | |
896 | ".pci_fixup_resume_early$", ".pci_fixup_suspend$" | |
897 | ||
e24f6628 PG |
898 | #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS |
899 | #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS | |
4a31a229 UKK |
900 | |
901 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
902 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 903 | |
6c5bd235 | 904 | #define DATA_SECTIONS ".data$", ".data.rel$" |
06df44ee | 905 | #define TEXT_SECTIONS ".text$", ".text.unlikely$" |
10668220 | 906 | |
fd6c3a8d | 907 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d | 908 | #define MEM_INIT_SECTIONS ".meminit.*" |
eb8f6890 | 909 | |
fd6c3a8d | 910 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d | 911 | #define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f6890 | 912 | |
6c5bd235 | 913 | /* init data sections */ |
eb8f6890 | 914 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
915 | |
916 | /* all init sections */ | |
eb8f6890 | 917 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
918 | |
919 | /* All init and exit sections (code + data) */ | |
920 | static const char *init_exit_sections[] = | |
eb8f6890 | 921 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
922 | |
923 | /* data section */ | |
924 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
925 | ||
6c5bd235 SR |
926 | |
927 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
928 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
929 | "*driver", \ | |
930 | "*_template", /* scsi uses *_template a lot */ \ | |
931 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
932 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
933 | "*_ops", \ | |
934 | "*_probe", \ | |
935 | "*_probe_one", \ | |
936 | "*_console" | |
6c5bd235 SR |
937 | |
938 | static const char *head_sections[] = { ".head.text*", NULL }; | |
939 | static const char *linker_symbols[] = | |
940 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
941 | ||
588ccd73 | 942 | enum mismatch { |
bbd3f4fb UKK |
943 | TEXT_TO_ANY_INIT, |
944 | DATA_TO_ANY_INIT, | |
945 | TEXT_TO_ANY_EXIT, | |
946 | DATA_TO_ANY_EXIT, | |
947 | XXXINIT_TO_SOME_INIT, | |
948 | XXXEXIT_TO_SOME_EXIT, | |
949 | ANY_INIT_TO_ANY_EXIT, | |
950 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
951 | EXPORT_TO_INIT_EXIT, |
952 | }; | |
953 | ||
10668220 SR |
954 | struct sectioncheck { |
955 | const char *fromsec[20]; | |
956 | const char *tosec[20]; | |
588ccd73 | 957 | enum mismatch mismatch; |
af92a82d | 958 | const char *symbol_white_list[20]; |
10668220 SR |
959 | }; |
960 | ||
961 | const struct sectioncheck sectioncheck[] = { | |
962 | /* Do not reference init/exit code/data from | |
963 | * normal code and data | |
964 | */ | |
965 | { | |
588ccd73 SR |
966 | .fromsec = { TEXT_SECTIONS, NULL }, |
967 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 968 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 969 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
970 | }, |
971 | { | |
972 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 973 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 974 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 975 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 976 | }, |
0db25245 UKK |
977 | { |
978 | .fromsec = { DATA_SECTIONS, NULL }, | |
979 | .tosec = { INIT_SECTIONS, NULL }, | |
980 | .mismatch = DATA_TO_ANY_INIT, | |
981 | .symbol_white_list = { | |
982 | "*_template", "*_timer", "*_sht", "*_ops", | |
983 | "*_probe", "*_probe_one", "*_console", NULL | |
984 | }, | |
985 | }, | |
588ccd73 SR |
986 | { |
987 | .fromsec = { TEXT_SECTIONS, NULL }, | |
988 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 989 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 990 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
991 | }, |
992 | { | |
993 | .fromsec = { DATA_SECTIONS, NULL }, | |
994 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 995 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 996 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 997 | }, |
e24f6628 | 998 | /* Do not reference init code/data from meminit code/data */ |
eb8f6890 | 999 | { |
4a31a229 | 1000 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 1001 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 1002 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 1003 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 1004 | }, |
e24f6628 | 1005 | /* Do not reference exit code/data from memexit code/data */ |
eb8f6890 | 1006 | { |
4a31a229 | 1007 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 1008 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1009 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1010 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1011 | }, |
1012 | /* Do not use exit code/data from init code */ | |
1013 | { | |
eb8f6890 SR |
1014 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
1015 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1016 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 1017 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1018 | }, |
1019 | /* Do not use init code/data from exit code */ | |
1020 | { | |
eb8f6890 | 1021 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 1022 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1023 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1024 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1025 | }, |
bb15d8db SAS |
1026 | { |
1027 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
1028 | .tosec = { INIT_SECTIONS, NULL }, | |
1029 | .mismatch = ANY_INIT_TO_ANY_EXIT, | |
1030 | .symbol_white_list = { NULL }, | |
1031 | }, | |
10668220 SR |
1032 | /* Do not export init/exit functions or data */ |
1033 | { | |
1034 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1035 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1036 | .mismatch = EXPORT_TO_INIT_EXIT, |
1037 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1038 | } |
1039 | }; | |
1040 | ||
0d2a636e UKK |
1041 | static const struct sectioncheck *section_mismatch( |
1042 | const char *fromsec, const char *tosec) | |
10668220 SR |
1043 | { |
1044 | int i; | |
1045 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1046 | const struct sectioncheck *check = §ioncheck[0]; | |
1047 | ||
1048 | for (i = 0; i < elems; i++) { | |
1049 | if (match(fromsec, check->fromsec) && | |
1050 | match(tosec, check->tosec)) | |
0d2a636e | 1051 | return check; |
10668220 SR |
1052 | check++; |
1053 | } | |
0d2a636e | 1054 | return NULL; |
10668220 SR |
1055 | } |
1056 | ||
4c8fbca5 SR |
1057 | /** |
1058 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1059 | * |
4c8fbca5 SR |
1060 | * Pattern 1: |
1061 | * If a module parameter is declared __initdata and permissions=0 | |
1062 | * then this is legal despite the warning generated. | |
1063 | * We cannot see value of permissions here, so just ignore | |
1064 | * this pattern. | |
1065 | * The pattern is identified by: | |
1066 | * tosec = .init.data | |
9209aed0 | 1067 | * fromsec = .data* |
4c8fbca5 | 1068 | * atsym =__param* |
62070fa4 | 1069 | * |
6a841528 RR |
1070 | * Pattern 1a: |
1071 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1072 | * The pattern is identified by: | |
1073 | * tosec = .init.text | |
1074 | * fromsec = .data* | |
1075 | * atsym = __param_ops_* | |
1076 | * | |
4c8fbca5 | 1077 | * Pattern 2: |
72ee59b5 | 1078 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1079 | * add, remove, probe functions etc. |
4c8fbca5 | 1080 | * the pattern is identified by: |
83cda2bb SR |
1081 | * tosec = init or exit section |
1082 | * fromsec = data section | |
df578e7d SR |
1083 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1084 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1085 | * |
1086 | * Pattern 3: | |
c993971f | 1087 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1088 | * |
1d8af559 | 1089 | * Pattern 4: |
ee6a8545 VG |
1090 | * Some symbols belong to init section but still it is ok to reference |
1091 | * these from non-init sections as these symbols don't have any memory | |
1092 | * allocated for them and symbol address and value are same. So even | |
1093 | * if init section is freed, its ok to reference those symbols. | |
1094 | * For ex. symbols marking the init section boundaries. | |
1095 | * This pattern is identified by | |
1096 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1097 | * |
4c8fbca5 | 1098 | **/ |
af92a82d UKK |
1099 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1100 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1101 | const char *tosec, const char *tosym) |
4c8fbca5 | 1102 | { |
4c8fbca5 | 1103 | /* Check for pattern 1 */ |
6c5bd235 SR |
1104 | if (match(tosec, init_data_sections) && |
1105 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1106 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1107 | return 0; | |
4c8fbca5 | 1108 | |
6a841528 RR |
1109 | /* Check for pattern 1a */ |
1110 | if (strcmp(tosec, ".init.text") == 0 && | |
1111 | match(fromsec, data_sections) && | |
1112 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1113 | return 0; | |
1114 | ||
4c8fbca5 | 1115 | /* Check for pattern 2 */ |
6c5bd235 SR |
1116 | if (match(tosec, init_exit_sections) && |
1117 | match(fromsec, data_sections) && | |
af92a82d | 1118 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1119 | return 0; |
4c8fbca5 | 1120 | |
9bf8cb9b | 1121 | /* Check for pattern 3 */ |
6c5bd235 SR |
1122 | if (match(fromsec, head_sections) && |
1123 | match(tosec, init_sections)) | |
58fb0d4f | 1124 | return 0; |
9bf8cb9b | 1125 | |
1d8af559 | 1126 | /* Check for pattern 4 */ |
58fb0d4f SR |
1127 | if (match(tosym, linker_symbols)) |
1128 | return 0; | |
9bf8cb9b | 1129 | |
58fb0d4f | 1130 | return 1; |
4c8fbca5 SR |
1131 | } |
1132 | ||
93684d3b SR |
1133 | /** |
1134 | * Find symbol based on relocation record info. | |
1135 | * In some cases the symbol supplied is a valid symbol so | |
1136 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1137 | * In other cases the symbol needs to be looked up in the symbol table | |
1138 | * based on section and address. | |
1139 | * **/ | |
9ad21c3f | 1140 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1141 | Elf_Sym *relsym) |
1142 | { | |
1143 | Elf_Sym *sym; | |
9ad21c3f SR |
1144 | Elf_Sym *near = NULL; |
1145 | Elf64_Sword distance = 20; | |
1146 | Elf64_Sword d; | |
1ce53adf | 1147 | unsigned int relsym_secindex; |
93684d3b SR |
1148 | |
1149 | if (relsym->st_name != 0) | |
1150 | return relsym; | |
1ce53adf DV |
1151 | |
1152 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1153 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1154 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1155 | continue; |
ae4ac123 AN |
1156 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1157 | continue; | |
93684d3b SR |
1158 | if (sym->st_value == addr) |
1159 | return sym; | |
9ad21c3f SR |
1160 | /* Find a symbol nearby - addr are maybe negative */ |
1161 | d = sym->st_value - addr; | |
1162 | if (d < 0) | |
1163 | d = addr - sym->st_value; | |
1164 | if (d < distance) { | |
1165 | distance = d; | |
1166 | near = sym; | |
1167 | } | |
93684d3b | 1168 | } |
9ad21c3f SR |
1169 | /* We need a close match */ |
1170 | if (distance < 20) | |
1171 | return near; | |
1172 | else | |
1173 | return NULL; | |
93684d3b SR |
1174 | } |
1175 | ||
da68d61f DB |
1176 | static inline int is_arm_mapping_symbol(const char *str) |
1177 | { | |
1178 | return str[0] == '$' && strchr("atd", str[1]) | |
1179 | && (str[2] == '\0' || str[2] == '.'); | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1184 | * one of the magic symbols emitted used by current ARM tools. | |
1185 | * | |
1186 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1187 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1188 | * only by merging __exit and __init sections into __text, bloating | |
1189 | * the kernel (which is especially evil on embedded platforms). | |
1190 | */ | |
1191 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1192 | { | |
1193 | const char *name = elf->strtab + sym->st_name; | |
1194 | ||
1195 | if (!name || !strlen(name)) | |
1196 | return 0; | |
1197 | return !is_arm_mapping_symbol(name); | |
1198 | } | |
1199 | ||
b39927cf | 1200 | /* |
43c74d17 SR |
1201 | * Find symbols before or equal addr and after addr - in the section sec. |
1202 | * If we find two symbols with equal offset prefer one with a valid name. | |
1203 | * The ELF format may have a better way to detect what type of symbol | |
1204 | * it is, but this works for now. | |
b39927cf | 1205 | **/ |
157c23c8 SR |
1206 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1207 | const char *sec) | |
b39927cf SR |
1208 | { |
1209 | Elf_Sym *sym; | |
157c23c8 | 1210 | Elf_Sym *near = NULL; |
157c23c8 | 1211 | Elf_Addr distance = ~0; |
62070fa4 | 1212 | |
b39927cf SR |
1213 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1214 | const char *symsec; | |
1215 | ||
1ce53adf | 1216 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1217 | continue; |
1ce53adf | 1218 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1219 | if (strcmp(symsec, sec) != 0) |
1220 | continue; | |
da68d61f DB |
1221 | if (!is_valid_name(elf, sym)) |
1222 | continue; | |
b39927cf | 1223 | if (sym->st_value <= addr) { |
157c23c8 SR |
1224 | if ((addr - sym->st_value) < distance) { |
1225 | distance = addr - sym->st_value; | |
1226 | near = sym; | |
1227 | } else if ((addr - sym->st_value) == distance) { | |
1228 | near = sym; | |
43c74d17 | 1229 | } |
b39927cf SR |
1230 | } |
1231 | } | |
157c23c8 | 1232 | return near; |
b39927cf SR |
1233 | } |
1234 | ||
588ccd73 SR |
1235 | /* |
1236 | * Convert a section name to the function/data attribute | |
1237 | * .init.text => __init | |
588ccd73 SR |
1238 | * .memexitconst => __memconst |
1239 | * etc. | |
cbcf14a9 AS |
1240 | * |
1241 | * The memory of returned value has been allocated on a heap. The user of this | |
1242 | * method should free it after usage. | |
588ccd73 SR |
1243 | */ |
1244 | static char *sec2annotation(const char *s) | |
1245 | { | |
1246 | if (match(s, init_exit_sections)) { | |
1247 | char *p = malloc(20); | |
1248 | char *r = p; | |
1249 | ||
1250 | *p++ = '_'; | |
1251 | *p++ = '_'; | |
1252 | if (*s == '.') | |
1253 | s++; | |
1254 | while (*s && *s != '.') | |
1255 | *p++ = *s++; | |
1256 | *p = '\0'; | |
1257 | if (*s == '.') | |
1258 | s++; | |
1259 | if (strstr(s, "rodata") != NULL) | |
1260 | strcat(p, "const "); | |
1261 | else if (strstr(s, "data") != NULL) | |
1262 | strcat(p, "data "); | |
1263 | else | |
1264 | strcat(p, " "); | |
cbcf14a9 | 1265 | return r; |
588ccd73 | 1266 | } else { |
5003bab8 | 1267 | return strdup(""); |
588ccd73 SR |
1268 | } |
1269 | } | |
1270 | ||
1271 | static int is_function(Elf_Sym *sym) | |
1272 | { | |
1273 | if (sym) | |
1274 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1275 | else | |
f666751a | 1276 | return -1; |
588ccd73 SR |
1277 | } |
1278 | ||
00759c0e RD |
1279 | static void print_section_list(const char * const list[20]) |
1280 | { | |
1281 | const char *const *s = list; | |
1282 | ||
1283 | while (*s) { | |
1284 | fprintf(stderr, "%s", *s); | |
1285 | s++; | |
1286 | if (*s) | |
1287 | fprintf(stderr, ", "); | |
1288 | } | |
1289 | fprintf(stderr, "\n"); | |
1290 | } | |
1291 | ||
58fb0d4f | 1292 | /* |
b39927cf SR |
1293 | * Print a warning about a section mismatch. |
1294 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1295 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1296 | */ |
0d2a636e UKK |
1297 | static void report_sec_mismatch(const char *modname, |
1298 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1299 | const char *fromsec, |
1300 | unsigned long long fromaddr, | |
1301 | const char *fromsym, | |
588ccd73 SR |
1302 | int from_is_func, |
1303 | const char *tosec, const char *tosym, | |
1304 | int to_is_func) | |
1305 | { | |
1306 | const char *from, *from_p; | |
1307 | const char *to, *to_p; | |
37ed19d5 AF |
1308 | char *prl_from; |
1309 | char *prl_to; | |
f666751a SR |
1310 | |
1311 | switch (from_is_func) { | |
1312 | case 0: from = "variable"; from_p = ""; break; | |
1313 | case 1: from = "function"; from_p = "()"; break; | |
1314 | default: from = "(unknown reference)"; from_p = ""; break; | |
1315 | } | |
1316 | switch (to_is_func) { | |
1317 | case 0: to = "variable"; to_p = ""; break; | |
1318 | case 1: to = "function"; to_p = "()"; break; | |
1319 | default: to = "(unknown reference)"; to_p = ""; break; | |
1320 | } | |
588ccd73 | 1321 | |
e5f95c8b SR |
1322 | sec_mismatch_count++; |
1323 | if (!sec_mismatch_verbose) | |
1324 | return; | |
1325 | ||
7c0ac495 GU |
1326 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1327 | "to the %s %s:%s%s\n", | |
1328 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1329 | tosym, to_p); | |
588ccd73 | 1330 | |
0d2a636e | 1331 | switch (mismatch->mismatch) { |
bbd3f4fb | 1332 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1333 | prl_from = sec2annotation(fromsec); |
1334 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1335 | fprintf(stderr, |
f666751a | 1336 | "The function %s%s() references\n" |
588ccd73 SR |
1337 | "the %s %s%s%s.\n" |
1338 | "This is often because %s lacks a %s\n" | |
1339 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1340 | prl_from, fromsym, |
1341 | to, prl_to, tosym, to_p, | |
1342 | fromsym, prl_to, tosym); | |
1343 | free(prl_from); | |
1344 | free(prl_to); | |
588ccd73 | 1345 | break; |
bbd3f4fb | 1346 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1347 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1348 | fprintf(stderr, |
1349 | "The variable %s references\n" | |
1350 | "the %s %s%s%s\n" | |
1351 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1352 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1353 | "or name the variable:\n", |
37ed19d5 | 1354 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1355 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1356 | free(prl_to); |
588ccd73 | 1357 | break; |
58fb0d4f | 1358 | } |
bbd3f4fb | 1359 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1360 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1361 | fprintf(stderr, |
1362 | "The function %s() references a %s in an exit section.\n" | |
1363 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1364 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1365 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1366 | free(prl_to); | |
588ccd73 | 1367 | break; |
bbd3f4fb | 1368 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1369 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1370 | fprintf(stderr, |
1371 | "The variable %s references\n" | |
1372 | "the %s %s%s%s\n" | |
1373 | "If the reference is valid then annotate the\n" | |
1374 | "variable with __exit* (see linux/init.h) or " | |
1375 | "name the variable:\n", | |
37ed19d5 | 1376 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1377 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1378 | free(prl_to); |
588ccd73 SR |
1379 | break; |
1380 | } | |
bbd3f4fb UKK |
1381 | case XXXINIT_TO_SOME_INIT: |
1382 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1383 | prl_from = sec2annotation(fromsec); |
1384 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1385 | fprintf(stderr, |
1386 | "The %s %s%s%s references\n" | |
1387 | "a %s %s%s%s.\n" | |
1388 | "If %s is only used by %s then\n" | |
1389 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1390 | from, prl_from, fromsym, from_p, |
1391 | to, prl_to, tosym, to_p, | |
b1d2675a | 1392 | tosym, fromsym, tosym); |
37ed19d5 AF |
1393 | free(prl_from); |
1394 | free(prl_to); | |
588ccd73 | 1395 | break; |
bbd3f4fb | 1396 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1397 | prl_from = sec2annotation(fromsec); |
1398 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1399 | fprintf(stderr, |
1400 | "The %s %s%s%s references\n" | |
1401 | "a %s %s%s%s.\n" | |
1402 | "This is often seen when error handling " | |
1403 | "in the init function\n" | |
1404 | "uses functionality in the exit path.\n" | |
1405 | "The fix is often to remove the %sannotation of\n" | |
1406 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1407 | from, prl_from, fromsym, from_p, |
1408 | to, prl_to, tosym, to_p, | |
5003bab8 | 1409 | prl_to, tosym, to_p); |
37ed19d5 AF |
1410 | free(prl_from); |
1411 | free(prl_to); | |
588ccd73 | 1412 | break; |
bbd3f4fb | 1413 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1414 | prl_from = sec2annotation(fromsec); |
1415 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1416 | fprintf(stderr, |
1417 | "The %s %s%s%s references\n" | |
1418 | "a %s %s%s%s.\n" | |
1419 | "This is often seen when error handling " | |
1420 | "in the exit function\n" | |
1421 | "uses functionality in the init path.\n" | |
1422 | "The fix is often to remove the %sannotation of\n" | |
1423 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1424 | from, prl_from, fromsym, from_p, |
1425 | to, prl_to, tosym, to_p, | |
1426 | prl_to, tosym, to_p); | |
1427 | free(prl_from); | |
1428 | free(prl_to); | |
588ccd73 SR |
1429 | break; |
1430 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1431 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1432 | fprintf(stderr, |
1433 | "The symbol %s is exported and annotated %s\n" | |
1434 | "Fix this by removing the %sannotation of %s " | |
1435 | "or drop the export.\n", | |
37ed19d5 AF |
1436 | tosym, prl_to, prl_to, tosym); |
1437 | free(prl_to); | |
588ccd73 SR |
1438 | break; |
1439 | } | |
1440 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1441 | } |
1442 | ||
1443 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1444 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1445 | { | |
1446 | const char *tosec; | |
0d2a636e | 1447 | const struct sectioncheck *mismatch; |
58fb0d4f | 1448 | |
1ce53adf | 1449 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1450 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1451 | if (mismatch) { |
588ccd73 SR |
1452 | Elf_Sym *to; |
1453 | Elf_Sym *from; | |
58fb0d4f | 1454 | const char *tosym; |
588ccd73 | 1455 | const char *fromsym; |
58fb0d4f | 1456 | |
588ccd73 SR |
1457 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1458 | fromsym = sym_name(elf, from); | |
1459 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1460 | tosym = sym_name(elf, to); | |
58fb0d4f | 1461 | |
77ab21ad AK |
1462 | if (!strncmp(fromsym, "reference___initcall", |
1463 | sizeof("reference___initcall")-1)) | |
1464 | return; | |
1465 | ||
58fb0d4f | 1466 | /* check whitelist - we may ignore it */ |
af92a82d UKK |
1467 | if (secref_whitelist(mismatch, |
1468 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1469 | report_sec_mismatch(modname, mismatch, |
1470 | fromsec, r->r_offset, fromsym, | |
1471 | is_function(from), tosec, tosym, | |
1472 | is_function(to)); | |
58fb0d4f | 1473 | } |
b39927cf SR |
1474 | } |
1475 | } | |
1476 | ||
ae4ac123 | 1477 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1478 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1479 | { |
1480 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1481 | int section = sechdr->sh_info; |
ae4ac123 AN |
1482 | |
1483 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1484 | r->r_offset; |
ae4ac123 AN |
1485 | } |
1486 | ||
5b24c071 | 1487 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1488 | { |
1489 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1490 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1491 | |
1492 | switch (r_typ) { | |
1493 | case R_386_32: | |
1494 | r->r_addend = TO_NATIVE(*location); | |
1495 | break; | |
1496 | case R_386_PC32: | |
1497 | r->r_addend = TO_NATIVE(*location) + 4; | |
1498 | /* For CONFIG_RELOCATABLE=y */ | |
1499 | if (elf->hdr->e_type == ET_EXEC) | |
1500 | r->r_addend += r->r_offset; | |
1501 | break; | |
1502 | } | |
1503 | return 0; | |
1504 | } | |
1505 | ||
6e2e340b TL |
1506 | #ifndef R_ARM_CALL |
1507 | #define R_ARM_CALL 28 | |
1508 | #endif | |
1509 | #ifndef R_ARM_JUMP24 | |
1510 | #define R_ARM_JUMP24 29 | |
1511 | #endif | |
1512 | ||
c9698e5c DL |
1513 | #ifndef R_ARM_THM_CALL |
1514 | #define R_ARM_THM_CALL 10 | |
1515 | #endif | |
1516 | #ifndef R_ARM_THM_JUMP24 | |
1517 | #define R_ARM_THM_JUMP24 30 | |
1518 | #endif | |
1519 | #ifndef R_ARM_THM_JUMP19 | |
1520 | #define R_ARM_THM_JUMP19 51 | |
1521 | #endif | |
1522 | ||
5b24c071 | 1523 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1524 | { |
1525 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1526 | ||
1527 | switch (r_typ) { | |
1528 | case R_ARM_ABS32: | |
1529 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1530 | r->r_addend = (int)(long) |
1531 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1532 | break; |
1533 | case R_ARM_PC24: | |
6e2e340b TL |
1534 | case R_ARM_CALL: |
1535 | case R_ARM_JUMP24: | |
c9698e5c DL |
1536 | case R_ARM_THM_CALL: |
1537 | case R_ARM_THM_JUMP24: | |
1538 | case R_ARM_THM_JUMP19: | |
56a974fa | 1539 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1540 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1541 | sechdr->sh_offset + |
1542 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1543 | break; |
1544 | default: | |
1545 | return 1; | |
1546 | } | |
1547 | return 0; | |
1548 | } | |
1549 | ||
5b24c071 | 1550 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1551 | { |
1552 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1553 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1554 | unsigned int inst; |
1555 | ||
1556 | if (r_typ == R_MIPS_HI16) | |
1557 | return 1; /* skip this */ | |
1558 | inst = TO_NATIVE(*location); | |
1559 | switch (r_typ) { | |
1560 | case R_MIPS_LO16: | |
1561 | r->r_addend = inst & 0xffff; | |
1562 | break; | |
1563 | case R_MIPS_26: | |
1564 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1565 | break; | |
1566 | case R_MIPS_32: | |
1567 | r->r_addend = inst; | |
1568 | break; | |
1569 | } | |
1570 | return 0; | |
1571 | } | |
1572 | ||
5b24c071 | 1573 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1574 | Elf_Shdr *sechdr) |
5b24c071 SR |
1575 | { |
1576 | Elf_Sym *sym; | |
1577 | Elf_Rela *rela; | |
1578 | Elf_Rela r; | |
1579 | unsigned int r_sym; | |
1580 | const char *fromsec; | |
5b24c071 | 1581 | |
ff13f926 | 1582 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1583 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1584 | ||
ff13f926 | 1585 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1586 | fromsec += strlen(".rela"); |
1587 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1588 | if (match(fromsec, section_white_list)) |
5b24c071 | 1589 | return; |
e241a630 | 1590 | |
5b24c071 SR |
1591 | for (rela = start; rela < stop; rela++) { |
1592 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1593 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1594 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1595 | unsigned int r_typ; |
1596 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1597 | r_sym = TO_NATIVE(r_sym); | |
1598 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1599 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1600 | } else { | |
1601 | r.r_info = TO_NATIVE(rela->r_info); | |
1602 | r_sym = ELF_R_SYM(r.r_info); | |
1603 | } | |
1604 | #else | |
1605 | r.r_info = TO_NATIVE(rela->r_info); | |
1606 | r_sym = ELF_R_SYM(r.r_info); | |
1607 | #endif | |
1608 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1609 | sym = elf->symtab_start + r_sym; | |
1610 | /* Skip special sections */ | |
1ce53adf | 1611 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1612 | continue; |
58fb0d4f | 1613 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1614 | } |
1615 | } | |
1616 | ||
1617 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1618 | Elf_Shdr *sechdr) |
5b24c071 SR |
1619 | { |
1620 | Elf_Sym *sym; | |
1621 | Elf_Rel *rel; | |
1622 | Elf_Rela r; | |
1623 | unsigned int r_sym; | |
1624 | const char *fromsec; | |
5b24c071 | 1625 | |
ff13f926 | 1626 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1627 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1628 | ||
ff13f926 | 1629 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1630 | fromsec += strlen(".rel"); |
1631 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1632 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1633 | return; |
1634 | ||
1635 | for (rel = start; rel < stop; rel++) { | |
1636 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1637 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1638 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1639 | unsigned int r_typ; |
1640 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1641 | r_sym = TO_NATIVE(r_sym); | |
1642 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1643 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1644 | } else { | |
1645 | r.r_info = TO_NATIVE(rel->r_info); | |
1646 | r_sym = ELF_R_SYM(r.r_info); | |
1647 | } | |
1648 | #else | |
1649 | r.r_info = TO_NATIVE(rel->r_info); | |
1650 | r_sym = ELF_R_SYM(r.r_info); | |
1651 | #endif | |
1652 | r.r_addend = 0; | |
ff13f926 | 1653 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1654 | case EM_386: |
1655 | if (addend_386_rel(elf, sechdr, &r)) | |
1656 | continue; | |
1657 | break; | |
1658 | case EM_ARM: | |
1659 | if (addend_arm_rel(elf, sechdr, &r)) | |
1660 | continue; | |
1661 | break; | |
1662 | case EM_MIPS: | |
1663 | if (addend_mips_rel(elf, sechdr, &r)) | |
1664 | continue; | |
1665 | break; | |
1666 | } | |
1667 | sym = elf->symtab_start + r_sym; | |
1668 | /* Skip special sections */ | |
1ce53adf | 1669 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1670 | continue; |
58fb0d4f | 1671 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1672 | } |
1673 | } | |
1674 | ||
b39927cf SR |
1675 | /** |
1676 | * A module includes a number of sections that are discarded | |
1677 | * either when loaded or when used as built-in. | |
1678 | * For loaded modules all functions marked __init and all data | |
b595076a | 1679 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1680 | * Likewise for modules used built-in the sections marked __exit |
1681 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1682 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1683 | * The check_sec_ref() function traverses all relocation records |
1684 | * to find all references to a section that reference a section that will | |
1685 | * be discarded and warns about it. | |
1686 | **/ | |
1687 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1688 | struct elf_info *elf) |
b39927cf SR |
1689 | { |
1690 | int i; | |
b39927cf | 1691 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1692 | |
b39927cf | 1693 | /* Walk through all sections */ |
1ce53adf | 1694 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1695 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1696 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1697 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1698 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1699 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1700 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1701 | } |
1702 | } | |
1703 | ||
7d02b490 AK |
1704 | static char *remove_dot(char *s) |
1705 | { | |
1706 | char *end; | |
1707 | int n = strcspn(s, "."); | |
1708 | ||
1709 | if (n > 0 && s[n] != 0) { | |
1710 | strtoul(s + n + 1, &end, 10); | |
1711 | if (end > s + n + 1 && (*end == '.' || *end == 0)) | |
1712 | s[n] = 0; | |
1713 | } | |
1714 | return s; | |
1715 | } | |
1716 | ||
5c3ead8c | 1717 | static void read_symbols(char *modname) |
1da177e4 LT |
1718 | { |
1719 | const char *symname; | |
1720 | char *version; | |
b817f6fe | 1721 | char *license; |
1da177e4 LT |
1722 | struct module *mod; |
1723 | struct elf_info info = { }; | |
1724 | Elf_Sym *sym; | |
1725 | ||
85bd2fdd SR |
1726 | if (!parse_elf(&info, modname)) |
1727 | return; | |
1da177e4 LT |
1728 | |
1729 | mod = new_module(modname); | |
1730 | ||
1731 | /* When there's no vmlinux, don't print warnings about | |
1732 | * unresolved symbols (since there'll be too many ;) */ | |
1733 | if (is_vmlinux(modname)) { | |
1da177e4 | 1734 | have_vmlinux = 1; |
1da177e4 LT |
1735 | mod->skip = 1; |
1736 | } | |
1737 | ||
b817f6fe | 1738 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1739 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1740 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1741 | "see include/linux/module.h for " | |
1742 | "more information\n", modname); | |
b817f6fe SR |
1743 | while (license) { |
1744 | if (license_is_gpl_compatible(license)) | |
1745 | mod->gpl_compatible = 1; | |
1746 | else { | |
1747 | mod->gpl_compatible = 0; | |
1748 | break; | |
1749 | } | |
1750 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1751 | "license", license); | |
1752 | } | |
1753 | ||
1da177e4 | 1754 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
7d02b490 | 1755 | symname = remove_dot(info.strtab + sym->st_name); |
1da177e4 LT |
1756 | |
1757 | handle_modversions(mod, &info, sym, symname); | |
1758 | handle_moddevtable(mod, &info, sym, symname); | |
1759 | } | |
d1f25e66 | 1760 | if (!is_vmlinux(modname) || |
10668220 SR |
1761 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1762 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1763 | |
1764 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1765 | if (version) | |
1766 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1767 | version - (char *)info.hdr); | |
1768 | if (version || (all_versions && !is_vmlinux(modname))) | |
1769 | get_src_version(modname, mod->srcversion, | |
1770 | sizeof(mod->srcversion)-1); | |
1771 | ||
1772 | parse_elf_finish(&info); | |
1773 | ||
8c8ef42a | 1774 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1775 | * never passed as an argument to an exported function, so |
1776 | * the automatic versioning doesn't pick it up, but it's really | |
1777 | * important anyhow */ | |
1778 | if (modversions) | |
8c8ef42a | 1779 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1780 | } |
1781 | ||
712f9b46 RR |
1782 | static void read_symbols_from_files(const char *filename) |
1783 | { | |
1784 | FILE *in = stdin; | |
1785 | char fname[PATH_MAX]; | |
1786 | ||
1787 | if (strcmp(filename, "-") != 0) { | |
1788 | in = fopen(filename, "r"); | |
1789 | if (!in) | |
1790 | fatal("Can't open filenames file %s: %m", filename); | |
1791 | } | |
1792 | ||
1793 | while (fgets(fname, PATH_MAX, in) != NULL) { | |
1794 | if (strends(fname, "\n")) | |
1795 | fname[strlen(fname)-1] = '\0'; | |
1796 | read_symbols(fname); | |
1797 | } | |
1798 | ||
1799 | if (in != stdin) | |
1800 | fclose(in); | |
1801 | } | |
1802 | ||
1da177e4 LT |
1803 | #define SZ 500 |
1804 | ||
1805 | /* We first write the generated file into memory using the | |
1806 | * following helper, then compare to the file on disk and | |
1807 | * only update the later if anything changed */ | |
1808 | ||
5c3ead8c SR |
1809 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1810 | const char *fmt, ...) | |
1da177e4 LT |
1811 | { |
1812 | char tmp[SZ]; | |
1813 | int len; | |
1814 | va_list ap; | |
62070fa4 | 1815 | |
1da177e4 LT |
1816 | va_start(ap, fmt); |
1817 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1818 | buf_write(buf, tmp, len); |
1da177e4 LT |
1819 | va_end(ap); |
1820 | } | |
1821 | ||
5c3ead8c | 1822 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1823 | { |
1824 | if (buf->size - buf->pos < len) { | |
7670f023 | 1825 | buf->size += len + SZ; |
1da177e4 LT |
1826 | buf->p = realloc(buf->p, buf->size); |
1827 | } | |
1828 | strncpy(buf->p + buf->pos, s, len); | |
1829 | buf->pos += len; | |
1830 | } | |
1831 | ||
c96fca21 SR |
1832 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1833 | { | |
1834 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1835 | ||
1836 | switch (exp) { | |
1837 | case export_gpl: | |
1838 | fatal("modpost: GPL-incompatible module %s%s " | |
1839 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1840 | break; | |
1841 | case export_unused_gpl: | |
1842 | fatal("modpost: GPL-incompatible module %s%s " | |
1843 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1844 | break; | |
1845 | case export_gpl_future: | |
1846 | warn("modpost: GPL-incompatible module %s%s " | |
1847 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1848 | break; | |
1849 | case export_plain: | |
1850 | case export_unused: | |
1851 | case export_unknown: | |
1852 | /* ignore */ | |
1853 | break; | |
1854 | } | |
1855 | } | |
1856 | ||
df578e7d | 1857 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1858 | { |
1859 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1860 | ||
1861 | switch (exp) { | |
1862 | case export_unused: | |
1863 | case export_unused_gpl: | |
1864 | warn("modpost: module %s%s " | |
1865 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1866 | break; | |
1867 | default: | |
1868 | /* ignore */ | |
1869 | break; | |
1870 | } | |
1871 | } | |
1872 | ||
1873 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1874 | { |
1875 | struct symbol *s, *exp; | |
1876 | ||
1877 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1878 | const char *basename; |
b817f6fe SR |
1879 | exp = find_symbol(s->name); |
1880 | if (!exp || exp->module == mod) | |
1881 | continue; | |
6449bd62 | 1882 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1883 | if (basename) |
1884 | basename++; | |
c96fca21 SR |
1885 | else |
1886 | basename = mod->name; | |
1887 | if (!mod->gpl_compatible) | |
1888 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1889 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1890 | } |
b817f6fe SR |
1891 | } |
1892 | ||
5c3ead8c SR |
1893 | /** |
1894 | * Header for the generated file | |
1895 | **/ | |
1896 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1897 | { |
1898 | buf_printf(b, "#include <linux/module.h>\n"); | |
1899 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1900 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1901 | buf_printf(b, "\n"); | |
1902 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1903 | buf_printf(b, "\n"); | |
e0f244c6 | 1904 | buf_printf(b, "__visible struct module __this_module\n"); |
1da177e4 | 1905 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
3c7ec94d | 1906 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 1907 | if (mod->has_init) |
3c7ec94d | 1908 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
1909 | if (mod->has_cleanup) |
1910 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 1911 | "\t.exit = cleanup_module,\n" |
1da177e4 | 1912 | "#endif\n"); |
3c7ec94d | 1913 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1914 | buf_printf(b, "};\n"); |
1915 | } | |
1916 | ||
2449b8ba BH |
1917 | static void add_intree_flag(struct buffer *b, int is_intree) |
1918 | { | |
1919 | if (is_intree) | |
1920 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
1921 | } | |
1922 | ||
5c725138 | 1923 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1924 | { |
1925 | static const char *staging_dir = "drivers/staging"; | |
1926 | ||
1927 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1928 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1929 | } | |
1930 | ||
5c3ead8c SR |
1931 | /** |
1932 | * Record CRCs for unresolved symbols | |
1933 | **/ | |
c53ddacd | 1934 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1935 | { |
1936 | struct symbol *s, *exp; | |
c53ddacd | 1937 | int err = 0; |
1da177e4 LT |
1938 | |
1939 | for (s = mod->unres; s; s = s->next) { | |
1940 | exp = find_symbol(s->name); | |
1941 | if (!exp || exp->module == mod) { | |
c53ddacd | 1942 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1943 | if (warn_unresolved) { |
1944 | warn("\"%s\" [%s.ko] undefined!\n", | |
1945 | s->name, mod->name); | |
1946 | } else { | |
1947 | merror("\"%s\" [%s.ko] undefined!\n", | |
1948 | s->name, mod->name); | |
1949 | err = 1; | |
1950 | } | |
c53ddacd | 1951 | } |
1da177e4 LT |
1952 | continue; |
1953 | } | |
1954 | s->module = exp->module; | |
1955 | s->crc_valid = exp->crc_valid; | |
1956 | s->crc = exp->crc; | |
1957 | } | |
1958 | ||
1959 | if (!modversions) | |
c53ddacd | 1960 | return err; |
1da177e4 LT |
1961 | |
1962 | buf_printf(b, "\n"); | |
1963 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1964 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1965 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1966 | ||
1967 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1968 | if (!s->module) |
1da177e4 | 1969 | continue; |
1da177e4 | 1970 | if (!s->crc_valid) { |
cb80514d | 1971 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1972 | s->name, mod->name); |
1973 | continue; | |
1974 | } | |
a53a11f3 | 1975 | buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", |
a4b6a77b | 1976 | s->crc, s->name); |
1da177e4 LT |
1977 | } |
1978 | ||
1979 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1980 | |
1981 | return err; | |
1da177e4 LT |
1982 | } |
1983 | ||
5c3ead8c SR |
1984 | static void add_depends(struct buffer *b, struct module *mod, |
1985 | struct module *modules) | |
1da177e4 LT |
1986 | { |
1987 | struct symbol *s; | |
1988 | struct module *m; | |
1989 | int first = 1; | |
1990 | ||
df578e7d | 1991 | for (m = modules; m; m = m->next) |
1da177e4 | 1992 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1993 | |
1994 | buf_printf(b, "\n"); | |
1995 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1996 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1997 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1998 | buf_printf(b, "\"depends="); | |
1999 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 2000 | const char *p; |
1da177e4 LT |
2001 | if (!s->module) |
2002 | continue; | |
2003 | ||
2004 | if (s->module->seen) | |
2005 | continue; | |
2006 | ||
2007 | s->module->seen = 1; | |
df578e7d SR |
2008 | p = strrchr(s->module->name, '/'); |
2009 | if (p) | |
a61b2dfd SR |
2010 | p++; |
2011 | else | |
2012 | p = s->module->name; | |
2013 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
2014 | first = 0; |
2015 | } | |
2016 | buf_printf(b, "\";\n"); | |
2017 | } | |
2018 | ||
5c3ead8c | 2019 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
2020 | { |
2021 | if (mod->srcversion[0]) { | |
2022 | buf_printf(b, "\n"); | |
2023 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
2024 | mod->srcversion); | |
2025 | } | |
2026 | } | |
2027 | ||
5c3ead8c | 2028 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
2029 | { |
2030 | char *tmp; | |
2031 | FILE *file; | |
2032 | struct stat st; | |
2033 | ||
2034 | file = fopen(fname, "r"); | |
2035 | if (!file) | |
2036 | goto write; | |
2037 | ||
2038 | if (fstat(fileno(file), &st) < 0) | |
2039 | goto close_write; | |
2040 | ||
2041 | if (st.st_size != b->pos) | |
2042 | goto close_write; | |
2043 | ||
2044 | tmp = NOFAIL(malloc(b->pos)); | |
2045 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
2046 | goto free_write; | |
2047 | ||
2048 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2049 | goto free_write; | |
2050 | ||
2051 | free(tmp); | |
2052 | fclose(file); | |
2053 | return; | |
2054 | ||
2055 | free_write: | |
2056 | free(tmp); | |
2057 | close_write: | |
2058 | fclose(file); | |
2059 | write: | |
2060 | file = fopen(fname, "w"); | |
2061 | if (!file) { | |
2062 | perror(fname); | |
2063 | exit(1); | |
2064 | } | |
2065 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2066 | perror(fname); | |
2067 | exit(1); | |
2068 | } | |
2069 | fclose(file); | |
2070 | } | |
2071 | ||
bd5cbced | 2072 | /* parse Module.symvers file. line format: |
534b89a9 | 2073 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2074 | **/ |
040fcc81 | 2075 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2076 | { |
2077 | unsigned long size, pos = 0; | |
2078 | void *file = grab_file(fname, &size); | |
2079 | char *line; | |
2080 | ||
df578e7d | 2081 | if (!file) |
1da177e4 LT |
2082 | /* No symbol versions, silently ignore */ |
2083 | return; | |
2084 | ||
2085 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2086 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2087 | unsigned int crc; |
2088 | struct module *mod; | |
040fcc81 | 2089 | struct symbol *s; |
1da177e4 LT |
2090 | |
2091 | if (!(symname = strchr(line, '\t'))) | |
2092 | goto fail; | |
2093 | *symname++ = '\0'; | |
2094 | if (!(modname = strchr(symname, '\t'))) | |
2095 | goto fail; | |
2096 | *modname++ = '\0'; | |
9ac545b0 | 2097 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2098 | *export++ = '\0'; |
534b89a9 SR |
2099 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2100 | *end = '\0'; | |
1da177e4 LT |
2101 | crc = strtoul(line, &d, 16); |
2102 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2103 | goto fail; | |
df578e7d SR |
2104 | mod = find_module(modname); |
2105 | if (!mod) { | |
2106 | if (is_vmlinux(modname)) | |
1da177e4 | 2107 | have_vmlinux = 1; |
0fa3a88c | 2108 | mod = new_module(modname); |
1da177e4 LT |
2109 | mod->skip = 1; |
2110 | } | |
bd5cbced | 2111 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2112 | s->kernel = kernel; |
2113 | s->preloaded = 1; | |
bd5cbced | 2114 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2115 | } |
2116 | return; | |
2117 | fail: | |
2118 | fatal("parse error in symbol dump file\n"); | |
2119 | } | |
2120 | ||
040fcc81 SR |
2121 | /* For normal builds always dump all symbols. |
2122 | * For external modules only dump symbols | |
2123 | * that are not read from kernel Module.symvers. | |
2124 | **/ | |
2125 | static int dump_sym(struct symbol *sym) | |
2126 | { | |
2127 | if (!external_module) | |
2128 | return 1; | |
2129 | if (sym->vmlinux || sym->kernel) | |
2130 | return 0; | |
2131 | return 1; | |
2132 | } | |
62070fa4 | 2133 | |
5c3ead8c | 2134 | static void write_dump(const char *fname) |
1da177e4 LT |
2135 | { |
2136 | struct buffer buf = { }; | |
2137 | struct symbol *symbol; | |
2138 | int n; | |
2139 | ||
2140 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2141 | symbol = symbolhash[n]; | |
2142 | while (symbol) { | |
040fcc81 | 2143 | if (dump_sym(symbol)) |
bd5cbced | 2144 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2145 | symbol->crc, symbol->name, |
bd5cbced RP |
2146 | symbol->module->name, |
2147 | export_str(symbol->export)); | |
1da177e4 LT |
2148 | symbol = symbol->next; |
2149 | } | |
2150 | } | |
2151 | write_if_changed(&buf, fname); | |
2152 | } | |
2153 | ||
2d04b5ae RH |
2154 | struct ext_sym_list { |
2155 | struct ext_sym_list *next; | |
2156 | const char *file; | |
2157 | }; | |
2158 | ||
5c3ead8c | 2159 | int main(int argc, char **argv) |
1da177e4 LT |
2160 | { |
2161 | struct module *mod; | |
2162 | struct buffer buf = { }; | |
040fcc81 | 2163 | char *kernel_read = NULL, *module_read = NULL; |
712f9b46 | 2164 | char *dump_write = NULL, *files_source = NULL; |
1da177e4 | 2165 | int opt; |
c53ddacd | 2166 | int err; |
2d04b5ae RH |
2167 | struct ext_sym_list *extsym_iter; |
2168 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2169 | |
eed380f3 | 2170 | while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:")) != -1) { |
df578e7d SR |
2171 | switch (opt) { |
2172 | case 'i': | |
2173 | kernel_read = optarg; | |
2174 | break; | |
2175 | case 'I': | |
2176 | module_read = optarg; | |
2177 | external_module = 1; | |
2178 | break; | |
2d04b5ae RH |
2179 | case 'e': |
2180 | external_module = 1; | |
2181 | extsym_iter = | |
2182 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2183 | extsym_iter->next = extsym_start; | |
2184 | extsym_iter->file = optarg; | |
2185 | extsym_start = extsym_iter; | |
2186 | break; | |
df578e7d SR |
2187 | case 'm': |
2188 | modversions = 1; | |
2189 | break; | |
eed380f3 GR |
2190 | case 'n': |
2191 | ignore_missing_files = 1; | |
2192 | break; | |
df578e7d SR |
2193 | case 'o': |
2194 | dump_write = optarg; | |
2195 | break; | |
2196 | case 'a': | |
2197 | all_versions = 1; | |
2198 | break; | |
2199 | case 's': | |
2200 | vmlinux_section_warnings = 0; | |
2201 | break; | |
588ccd73 SR |
2202 | case 'S': |
2203 | sec_mismatch_verbose = 0; | |
2204 | break; | |
712f9b46 RR |
2205 | case 'T': |
2206 | files_source = optarg; | |
2207 | break; | |
df578e7d SR |
2208 | case 'w': |
2209 | warn_unresolved = 1; | |
2210 | break; | |
2211 | default: | |
2212 | exit(1); | |
1da177e4 LT |
2213 | } |
2214 | } | |
2215 | ||
040fcc81 SR |
2216 | if (kernel_read) |
2217 | read_dump(kernel_read, 1); | |
2218 | if (module_read) | |
2219 | read_dump(module_read, 0); | |
2d04b5ae RH |
2220 | while (extsym_start) { |
2221 | read_dump(extsym_start->file, 0); | |
2222 | extsym_iter = extsym_start->next; | |
2223 | free(extsym_start); | |
2224 | extsym_start = extsym_iter; | |
2225 | } | |
1da177e4 | 2226 | |
df578e7d | 2227 | while (optind < argc) |
1da177e4 | 2228 | read_symbols(argv[optind++]); |
1da177e4 | 2229 | |
712f9b46 RR |
2230 | if (files_source) |
2231 | read_symbols_from_files(files_source); | |
2232 | ||
b817f6fe SR |
2233 | for (mod = modules; mod; mod = mod->next) { |
2234 | if (mod->skip) | |
2235 | continue; | |
c96fca21 | 2236 | check_exports(mod); |
b817f6fe SR |
2237 | } |
2238 | ||
c53ddacd KK |
2239 | err = 0; |
2240 | ||
1da177e4 | 2241 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2242 | char fname[strlen(mod->name) + 10]; |
2243 | ||
1da177e4 LT |
2244 | if (mod->skip) |
2245 | continue; | |
2246 | ||
2247 | buf.pos = 0; | |
2248 | ||
2249 | add_header(&buf, mod); | |
2449b8ba | 2250 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2251 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2252 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2253 | add_depends(&buf, mod, modules); |
2254 | add_moddevtable(&buf, mod); | |
2255 | add_srcversion(&buf, mod); | |
2256 | ||
2257 | sprintf(fname, "%s.mod.c", mod->name); | |
2258 | write_if_changed(&buf, fname); | |
2259 | } | |
2260 | ||
2261 | if (dump_write) | |
2262 | write_dump(dump_write); | |
588ccd73 | 2263 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2264 | warn("modpost: Found %d section mismatch(es).\n" |
2265 | "To see full details build your kernel with:\n" | |
2266 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2267 | sec_mismatch_count); | |
1da177e4 | 2268 | |
c53ddacd | 2269 | return err; |
1da177e4 | 2270 | } |