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> |
1da177e4 | 20 | #include "modpost.h" |
5a865c06 | 21 | #include "../../include/generated/autoconf.h" |
b817f6fe | 22 | #include "../../include/linux/license.h" |
b92021b0 | 23 | #include "../../include/linux/export.h" |
9e1b9b80 | 24 | |
1da177e4 LT |
25 | /* Are we using CONFIG_MODVERSIONS? */ |
26 | int modversions = 0; | |
27 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
28 | int have_vmlinux = 0; | |
29 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
30 | static int all_versions = 0; | |
040fcc81 SR |
31 | /* If we are modposting external module set to 1 */ |
32 | static int external_module = 0; | |
8d8d8289 SR |
33 | /* Warn about section mismatch in vmlinux if set to 1 */ |
34 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
35 | /* Only warn about unresolved symbols */ |
36 | static int warn_unresolved = 0; | |
bd5cbced | 37 | /* How a symbol is exported */ |
588ccd73 SR |
38 | static int sec_mismatch_count = 0; |
39 | static int sec_mismatch_verbose = 1; | |
40 | ||
c96fca21 SR |
41 | enum export { |
42 | export_plain, export_unused, export_gpl, | |
43 | export_unused_gpl, export_gpl_future, export_unknown | |
44 | }; | |
1da177e4 | 45 | |
6d9a89ea AK |
46 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
47 | ||
48 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
49 | { |
50 | va_list arglist; | |
51 | ||
52 | fprintf(stderr, "FATAL: "); | |
53 | ||
54 | va_start(arglist, fmt); | |
55 | vfprintf(stderr, fmt, arglist); | |
56 | va_end(arglist); | |
57 | ||
58 | exit(1); | |
59 | } | |
60 | ||
6d9a89ea | 61 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
62 | { |
63 | va_list arglist; | |
64 | ||
65 | fprintf(stderr, "WARNING: "); | |
66 | ||
67 | va_start(arglist, fmt); | |
68 | vfprintf(stderr, fmt, arglist); | |
69 | va_end(arglist); | |
70 | } | |
71 | ||
6d9a89ea | 72 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
73 | { |
74 | va_list arglist; | |
75 | ||
76 | fprintf(stderr, "ERROR: "); | |
77 | ||
78 | va_start(arglist, fmt); | |
79 | vfprintf(stderr, fmt, arglist); | |
80 | va_end(arglist); | |
81 | } | |
82 | ||
d4ef1c30 RR |
83 | static inline bool strends(const char *str, const char *postfix) |
84 | { | |
85 | if (strlen(str) < strlen(postfix)) | |
86 | return false; | |
87 | ||
88 | return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; | |
89 | } | |
90 | ||
040fcc81 SR |
91 | static int is_vmlinux(const char *modname) |
92 | { | |
93 | const char *myname; | |
94 | ||
df578e7d SR |
95 | myname = strrchr(modname, '/'); |
96 | if (myname) | |
040fcc81 SR |
97 | myname++; |
98 | else | |
99 | myname = modname; | |
100 | ||
741f98fe SR |
101 | return (strcmp(myname, "vmlinux") == 0) || |
102 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
103 | } |
104 | ||
1da177e4 LT |
105 | void *do_nofail(void *ptr, const char *expr) |
106 | { | |
df578e7d | 107 | if (!ptr) |
1da177e4 | 108 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 109 | |
1da177e4 LT |
110 | return ptr; |
111 | } | |
112 | ||
113 | /* A list of all modules we processed */ | |
1da177e4 LT |
114 | static struct module *modules; |
115 | ||
5c3ead8c | 116 | static struct module *find_module(char *modname) |
1da177e4 LT |
117 | { |
118 | struct module *mod; | |
119 | ||
120 | for (mod = modules; mod; mod = mod->next) | |
121 | if (strcmp(mod->name, modname) == 0) | |
122 | break; | |
123 | return mod; | |
124 | } | |
125 | ||
d4ef1c30 | 126 | static struct module *new_module(const char *modname) |
1da177e4 LT |
127 | { |
128 | struct module *mod; | |
d4ef1c30 | 129 | char *p; |
62070fa4 | 130 | |
1da177e4 LT |
131 | mod = NOFAIL(malloc(sizeof(*mod))); |
132 | memset(mod, 0, sizeof(*mod)); | |
133 | p = NOFAIL(strdup(modname)); | |
134 | ||
135 | /* strip trailing .o */ | |
d4ef1c30 RR |
136 | if (strends(p, ".o")) { |
137 | p[strlen(p) - 2] = '\0'; | |
138 | mod->is_dot_o = 1; | |
139 | } | |
1da177e4 LT |
140 | |
141 | /* add to list */ | |
142 | mod->name = p; | |
b817f6fe | 143 | mod->gpl_compatible = -1; |
1da177e4 LT |
144 | mod->next = modules; |
145 | modules = mod; | |
146 | ||
147 | return mod; | |
148 | } | |
149 | ||
150 | /* A hash of all exported symbols, | |
151 | * struct symbol is also used for lists of unresolved symbols */ | |
152 | ||
153 | #define SYMBOL_HASH_SIZE 1024 | |
154 | ||
155 | struct symbol { | |
156 | struct symbol *next; | |
157 | struct module *module; | |
158 | unsigned int crc; | |
159 | int crc_valid; | |
160 | unsigned int weak:1; | |
040fcc81 SR |
161 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
162 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
163 | * (only for external modules) **/ | |
8e70c458 | 164 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 165 | enum export export; /* Type of export */ |
1da177e4 LT |
166 | char name[0]; |
167 | }; | |
168 | ||
169 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
170 | ||
171 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
172 | static inline unsigned int tdb_hash(const char *name) | |
173 | { | |
174 | unsigned value; /* Used to compute the hash value. */ | |
175 | unsigned i; /* Used to cycle through random values. */ | |
176 | ||
177 | /* Set the initial value from the key size. */ | |
df578e7d | 178 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
179 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
180 | ||
181 | return (1103515243 * value + 12345); | |
182 | } | |
183 | ||
5c3ead8c SR |
184 | /** |
185 | * Allocate a new symbols for use in the hash of exported symbols or | |
186 | * the list of unresolved symbols per module | |
187 | **/ | |
188 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
189 | struct symbol *next) | |
1da177e4 LT |
190 | { |
191 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
192 | ||
193 | memset(s, 0, sizeof(*s)); | |
194 | strcpy(s->name, name); | |
195 | s->weak = weak; | |
196 | s->next = next; | |
197 | return s; | |
198 | } | |
199 | ||
200 | /* For the hash of exported symbols */ | |
bd5cbced RP |
201 | static struct symbol *new_symbol(const char *name, struct module *module, |
202 | enum export export) | |
1da177e4 LT |
203 | { |
204 | unsigned int hash; | |
205 | struct symbol *new; | |
206 | ||
207 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
208 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
209 | new->module = module; | |
bd5cbced | 210 | new->export = export; |
040fcc81 | 211 | return new; |
1da177e4 LT |
212 | } |
213 | ||
5c3ead8c | 214 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
215 | { |
216 | struct symbol *s; | |
217 | ||
218 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
219 | if (name[0] == '.') | |
220 | name++; | |
221 | ||
df578e7d | 222 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
223 | if (strcmp(s->name, name) == 0) |
224 | return s; | |
225 | } | |
226 | return NULL; | |
227 | } | |
228 | ||
bd5cbced RP |
229 | static struct { |
230 | const char *str; | |
231 | enum export export; | |
232 | } export_list[] = { | |
233 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 234 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 235 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 236 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
237 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
238 | { .str = "(unknown)", .export = export_unknown }, | |
239 | }; | |
240 | ||
241 | ||
242 | static const char *export_str(enum export ex) | |
243 | { | |
244 | return export_list[ex].str; | |
245 | } | |
246 | ||
df578e7d | 247 | static enum export export_no(const char *s) |
bd5cbced RP |
248 | { |
249 | int i; | |
df578e7d | 250 | |
534b89a9 SR |
251 | if (!s) |
252 | return export_unknown; | |
bd5cbced RP |
253 | for (i = 0; export_list[i].export != export_unknown; i++) { |
254 | if (strcmp(export_list[i].str, s) == 0) | |
255 | return export_list[i].export; | |
256 | } | |
257 | return export_unknown; | |
258 | } | |
259 | ||
62a26356 AIB |
260 | static const char *sec_name(struct elf_info *elf, int secindex); |
261 | ||
262 | #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) | |
263 | ||
264 | static enum export export_from_secname(struct elf_info *elf, unsigned int sec) | |
265 | { | |
266 | const char *secname = sec_name(elf, sec); | |
267 | ||
268 | if (strstarts(secname, "___ksymtab+")) | |
269 | return export_plain; | |
270 | else if (strstarts(secname, "___ksymtab_unused+")) | |
271 | return export_unused; | |
272 | else if (strstarts(secname, "___ksymtab_gpl+")) | |
273 | return export_gpl; | |
274 | else if (strstarts(secname, "___ksymtab_unused_gpl+")) | |
275 | return export_unused_gpl; | |
276 | else if (strstarts(secname, "___ksymtab_gpl_future+")) | |
277 | return export_gpl_future; | |
278 | else | |
279 | return export_unknown; | |
280 | } | |
281 | ||
1ce53adf | 282 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
283 | { |
284 | if (sec == elf->export_sec) | |
285 | return export_plain; | |
c96fca21 SR |
286 | else if (sec == elf->export_unused_sec) |
287 | return export_unused; | |
bd5cbced RP |
288 | else if (sec == elf->export_gpl_sec) |
289 | return export_gpl; | |
c96fca21 SR |
290 | else if (sec == elf->export_unused_gpl_sec) |
291 | return export_unused_gpl; | |
bd5cbced RP |
292 | else if (sec == elf->export_gpl_future_sec) |
293 | return export_gpl_future; | |
294 | else | |
295 | return export_unknown; | |
296 | } | |
297 | ||
5c3ead8c SR |
298 | /** |
299 | * Add an exported symbol - it may have already been added without a | |
300 | * CRC, in this case just update the CRC | |
301 | **/ | |
bd5cbced RP |
302 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
303 | enum export export) | |
1da177e4 LT |
304 | { |
305 | struct symbol *s = find_symbol(name); | |
306 | ||
307 | if (!s) { | |
bd5cbced | 308 | s = new_symbol(name, mod, export); |
8e70c458 SR |
309 | } else { |
310 | if (!s->preloaded) { | |
7b75b13c | 311 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
312 | "was in %s%s\n", mod->name, name, |
313 | s->module->name, | |
314 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
315 | } else { |
316 | /* In case Modules.symvers was out of date */ | |
317 | s->module = mod; | |
8e70c458 | 318 | } |
1da177e4 | 319 | } |
8e70c458 | 320 | s->preloaded = 0; |
040fcc81 SR |
321 | s->vmlinux = is_vmlinux(mod->name); |
322 | s->kernel = 0; | |
bd5cbced | 323 | s->export = export; |
040fcc81 SR |
324 | return s; |
325 | } | |
326 | ||
327 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 328 | unsigned int crc, enum export export) |
040fcc81 SR |
329 | { |
330 | struct symbol *s = find_symbol(name); | |
331 | ||
332 | if (!s) | |
bd5cbced | 333 | s = new_symbol(name, mod, export); |
040fcc81 SR |
334 | s->crc = crc; |
335 | s->crc_valid = 1; | |
1da177e4 LT |
336 | } |
337 | ||
5c3ead8c | 338 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
339 | { |
340 | struct stat st; | |
eb3d5cc6 | 341 | void *map = MAP_FAILED; |
1da177e4 LT |
342 | int fd; |
343 | ||
344 | fd = open(filename, O_RDONLY); | |
eb3d5cc6 | 345 | if (fd < 0) |
1da177e4 | 346 | return NULL; |
eb3d5cc6 JJ |
347 | if (fstat(fd, &st)) |
348 | goto failed; | |
1da177e4 LT |
349 | |
350 | *size = st.st_size; | |
351 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
1da177e4 | 352 | |
eb3d5cc6 JJ |
353 | failed: |
354 | close(fd); | |
1da177e4 LT |
355 | if (map == MAP_FAILED) |
356 | return NULL; | |
357 | return map; | |
358 | } | |
359 | ||
5c3ead8c SR |
360 | /** |
361 | * Return a copy of the next line in a mmap'ed file. | |
362 | * spaces in the beginning of the line is trimmed away. | |
363 | * Return a pointer to a static buffer. | |
364 | **/ | |
df578e7d | 365 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
366 | { |
367 | static char line[4096]; | |
368 | int skip = 1; | |
369 | size_t len = 0; | |
370 | signed char *p = (signed char *)file + *pos; | |
371 | char *s = line; | |
372 | ||
df578e7d | 373 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
374 | if (skip && isspace(*p)) { |
375 | p++; | |
376 | continue; | |
377 | } | |
378 | skip = 0; | |
379 | if (*p != '\n' && (*pos < size)) { | |
380 | len++; | |
381 | *s++ = *p++; | |
382 | if (len > 4095) | |
383 | break; /* Too long, stop */ | |
384 | } else { | |
385 | /* End of string */ | |
386 | *s = '\0'; | |
387 | return line; | |
388 | } | |
389 | } | |
390 | /* End of buffer */ | |
391 | return NULL; | |
392 | } | |
393 | ||
5c3ead8c | 394 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
395 | { |
396 | munmap(file, size); | |
397 | } | |
398 | ||
85bd2fdd | 399 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
400 | { |
401 | unsigned int i; | |
85bd2fdd | 402 | Elf_Ehdr *hdr; |
1da177e4 LT |
403 | Elf_Shdr *sechdrs; |
404 | Elf_Sym *sym; | |
1ce53adf DV |
405 | const char *secstrings; |
406 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
407 | |
408 | hdr = grab_file(filename, &info->size); | |
409 | if (!hdr) { | |
410 | perror(filename); | |
6803dc0e | 411 | exit(1); |
1da177e4 LT |
412 | } |
413 | info->hdr = hdr; | |
85bd2fdd SR |
414 | if (info->size < sizeof(*hdr)) { |
415 | /* file too small, assume this is an empty .o file */ | |
416 | return 0; | |
417 | } | |
418 | /* Is this a valid ELF file? */ | |
419 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
420 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
421 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
422 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
423 | /* Not an ELF file - silently ignore it */ | |
424 | return 0; | |
425 | } | |
1da177e4 | 426 | /* Fix endianness in ELF header */ |
7d875a02 AK |
427 | hdr->e_type = TO_NATIVE(hdr->e_type); |
428 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
429 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
430 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
431 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
432 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
433 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
434 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
435 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
436 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
437 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
438 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
439 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
440 | sechdrs = (void *)hdr + hdr->e_shoff; |
441 | info->sechdrs = sechdrs; | |
442 | ||
a83710e5 PS |
443 | /* Check if file offset is correct */ |
444 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
445 | fatal("section header offset=%lu in file '%s' is bigger than " |
446 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
447 | filename, info->size); | |
a83710e5 PS |
448 | return 0; |
449 | } | |
450 | ||
6845756b | 451 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
452 | /* |
453 | * There are more than 64k sections, | |
454 | * read count from .sh_size. | |
1ce53adf DV |
455 | */ |
456 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
457 | } | |
458 | else { | |
459 | info->num_sections = hdr->e_shnum; | |
460 | } | |
461 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 462 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
463 | } |
464 | else { | |
465 | info->secindex_strings = hdr->e_shstrndx; | |
466 | } | |
467 | ||
1da177e4 | 468 | /* Fix endianness in section headers */ |
1ce53adf | 469 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
470 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
471 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
472 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
473 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
474 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
475 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
476 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
477 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
478 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
479 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
480 | } |
481 | /* Find symbol table. */ | |
1ce53adf DV |
482 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
483 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 484 | const char *secname; |
56fc82c5 | 485 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 486 | |
56fc82c5 | 487 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
488 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
489 | "sizeof(*hrd)=%zu\n", filename, | |
490 | (unsigned long)sechdrs[i].sh_offset, | |
491 | sizeof(*hdr)); | |
85bd2fdd SR |
492 | return 0; |
493 | } | |
bd5cbced RP |
494 | secname = secstrings + sechdrs[i].sh_name; |
495 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
496 | if (nobits) |
497 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
498 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
499 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
500 | } else if (strcmp(secname, "__ksymtab") == 0) |
501 | info->export_sec = i; | |
c96fca21 SR |
502 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
503 | info->export_unused_sec = i; | |
bd5cbced RP |
504 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
505 | info->export_gpl_sec = i; | |
c96fca21 SR |
506 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
507 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
508 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
509 | info->export_gpl_future_sec = i; | |
510 | ||
1ce53adf DV |
511 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
512 | unsigned int sh_link_idx; | |
513 | symtab_idx = i; | |
514 | info->symtab_start = (void *)hdr + | |
515 | sechdrs[i].sh_offset; | |
516 | info->symtab_stop = (void *)hdr + | |
517 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 518 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
519 | info->strtab = (void *)hdr + |
520 | sechdrs[sh_link_idx].sh_offset; | |
521 | } | |
1da177e4 | 522 | |
1ce53adf DV |
523 | /* 32bit section no. table? ("more than 64k sections") */ |
524 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
525 | symtab_shndx_idx = i; | |
526 | info->symtab_shndx_start = (void *)hdr + | |
527 | sechdrs[i].sh_offset; | |
528 | info->symtab_shndx_stop = (void *)hdr + | |
529 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
530 | } | |
1da177e4 | 531 | } |
df578e7d | 532 | if (!info->symtab_start) |
cb80514d | 533 | fatal("%s has no symtab?\n", filename); |
df578e7d | 534 | |
1da177e4 LT |
535 | /* Fix endianness in symbols */ |
536 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
537 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
538 | sym->st_name = TO_NATIVE(sym->st_name); | |
539 | sym->st_value = TO_NATIVE(sym->st_value); | |
540 | sym->st_size = TO_NATIVE(sym->st_size); | |
541 | } | |
1ce53adf DV |
542 | |
543 | if (symtab_shndx_idx != ~0U) { | |
544 | Elf32_Word *p; | |
6845756b | 545 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 546 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 547 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
548 | symtab_idx); |
549 | /* Fix endianness */ | |
550 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
551 | p++) | |
552 | *p = TO_NATIVE(*p); | |
553 | } | |
554 | ||
85bd2fdd | 555 | return 1; |
1da177e4 LT |
556 | } |
557 | ||
5c3ead8c | 558 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
559 | { |
560 | release_file(info->hdr, info->size); | |
561 | } | |
562 | ||
4d7365d6 SR |
563 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
564 | { | |
565 | /* ignore __this_module, it will be resolved shortly */ | |
b92021b0 | 566 | if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0) |
4d7365d6 SR |
567 | return 1; |
568 | /* ignore global offset table */ | |
569 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
570 | return 1; | |
571 | if (info->hdr->e_machine == EM_PPC) | |
572 | /* Special register function linked on all modules during final link of .ko */ | |
573 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
574 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
575 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
70c6edb3 AS |
576 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 || |
577 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
578 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
4d7365d6 | 579 | return 1; |
7fca5dc8 SR |
580 | if (info->hdr->e_machine == EM_PPC64) |
581 | /* Special register function linked on all modules during final link of .ko */ | |
582 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
70c6edb3 AS |
583 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 || |
584 | strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 || | |
585 | strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0) | |
7fca5dc8 | 586 | return 1; |
4d7365d6 SR |
587 | /* Do not ignore this symbol */ |
588 | return 0; | |
589 | } | |
590 | ||
b92021b0 RR |
591 | #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_) |
592 | #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_) | |
1da177e4 | 593 | |
5c3ead8c SR |
594 | static void handle_modversions(struct module *mod, struct elf_info *info, |
595 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
596 | { |
597 | unsigned int crc; | |
62a26356 AIB |
598 | enum export export; |
599 | ||
258f7426 FR |
600 | if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
601 | strncmp(symname, "__ksymtab", 9) == 0) | |
62a26356 AIB |
602 | export = export_from_secname(info, get_secindex(info, sym)); |
603 | else | |
604 | export = export_from_sec(info, get_secindex(info, sym)); | |
1da177e4 LT |
605 | |
606 | switch (sym->st_shndx) { | |
607 | case SHN_COMMON: | |
cb80514d | 608 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
609 | break; |
610 | case SHN_ABS: | |
611 | /* CRC'd symbol */ | |
8d99513c | 612 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 613 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
614 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
615 | export); | |
1da177e4 LT |
616 | } |
617 | break; | |
618 | case SHN_UNDEF: | |
619 | /* undefined symbol */ | |
620 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
621 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
622 | break; | |
4d7365d6 | 623 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 624 | break; |
8d529014 BC |
625 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
626 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
627 | /* add compatibility with older glibc */ | |
628 | #ifndef STT_SPARC_REGISTER | |
629 | #define STT_SPARC_REGISTER STT_REGISTER | |
630 | #endif | |
1da177e4 LT |
631 | if (info->hdr->e_machine == EM_SPARC || |
632 | info->hdr->e_machine == EM_SPARCV9) { | |
633 | /* Ignore register directives. */ | |
8d529014 | 634 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 635 | break; |
62070fa4 SR |
636 | if (symname[0] == '.') { |
637 | char *munged = strdup(symname); | |
638 | munged[0] = '_'; | |
639 | munged[1] = toupper(munged[1]); | |
640 | symname = munged; | |
641 | } | |
1da177e4 LT |
642 | } |
643 | #endif | |
62070fa4 | 644 | |
b92021b0 RR |
645 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
646 | if (symname[0] != '_') | |
647 | break; | |
648 | else | |
649 | symname++; | |
650 | #endif | |
651 | mod->unres = alloc_symbol(symname, | |
652 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
653 | mod->unres); | |
1da177e4 LT |
654 | break; |
655 | default: | |
656 | /* All exported symbols */ | |
8d99513c | 657 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
658 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
659 | export); | |
1da177e4 | 660 | } |
b92021b0 | 661 | if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0) |
1da177e4 | 662 | mod->has_init = 1; |
b92021b0 | 663 | if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0) |
1da177e4 LT |
664 | mod->has_cleanup = 1; |
665 | break; | |
666 | } | |
667 | } | |
668 | ||
5c3ead8c SR |
669 | /** |
670 | * Parse tag=value strings from .modinfo section | |
671 | **/ | |
1da177e4 LT |
672 | static char *next_string(char *string, unsigned long *secsize) |
673 | { | |
674 | /* Skip non-zero chars */ | |
675 | while (string[0]) { | |
676 | string++; | |
677 | if ((*secsize)-- <= 1) | |
678 | return NULL; | |
679 | } | |
680 | ||
681 | /* Skip any zero padding. */ | |
682 | while (!string[0]) { | |
683 | string++; | |
684 | if ((*secsize)-- <= 1) | |
685 | return NULL; | |
686 | } | |
687 | return string; | |
688 | } | |
689 | ||
b817f6fe SR |
690 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
691 | const char *tag, char *info) | |
1da177e4 LT |
692 | { |
693 | char *p; | |
694 | unsigned int taglen = strlen(tag); | |
695 | unsigned long size = modinfo_len; | |
696 | ||
b817f6fe SR |
697 | if (info) { |
698 | size -= info - (char *)modinfo; | |
699 | modinfo = next_string(info, &size); | |
700 | } | |
701 | ||
1da177e4 LT |
702 | for (p = modinfo; p; p = next_string(p, &size)) { |
703 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
704 | return p + taglen + 1; | |
705 | } | |
706 | return NULL; | |
707 | } | |
708 | ||
b817f6fe SR |
709 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
710 | const char *tag) | |
711 | ||
712 | { | |
713 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
714 | } | |
715 | ||
4c8fbca5 SR |
716 | /** |
717 | * Test if string s ends in string sub | |
718 | * return 0 if match | |
719 | **/ | |
720 | static int strrcmp(const char *s, const char *sub) | |
721 | { | |
df578e7d | 722 | int slen, sublen; |
62070fa4 | 723 | |
4c8fbca5 SR |
724 | if (!s || !sub) |
725 | return 1; | |
62070fa4 | 726 | |
4c8fbca5 | 727 | slen = strlen(s); |
df578e7d | 728 | sublen = strlen(sub); |
62070fa4 | 729 | |
4c8fbca5 SR |
730 | if ((slen == 0) || (sublen == 0)) |
731 | return 1; | |
732 | ||
df578e7d SR |
733 | if (sublen > slen) |
734 | return 1; | |
4c8fbca5 | 735 | |
df578e7d | 736 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
737 | } |
738 | ||
ff13f926 SR |
739 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
740 | { | |
58fb0d4f SR |
741 | if (sym) |
742 | return elf->strtab + sym->st_name; | |
743 | else | |
f666751a | 744 | return "(unknown)"; |
ff13f926 SR |
745 | } |
746 | ||
1ce53adf | 747 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
748 | { |
749 | Elf_Shdr *sechdrs = elf->sechdrs; | |
750 | return (void *)elf->hdr + | |
1ce53adf DV |
751 | elf->sechdrs[elf->secindex_strings].sh_offset + |
752 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
753 | } |
754 | ||
755 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
756 | { | |
757 | return (void *)elf->hdr + | |
1ce53adf DV |
758 | elf->sechdrs[elf->secindex_strings].sh_offset + |
759 | sechdr->sh_name; | |
ff13f926 SR |
760 | } |
761 | ||
10668220 SR |
762 | /* if sym is empty or point to a string |
763 | * like ".[0-9]+" then return 1. | |
764 | * This is the optional prefix added by ld to some sections | |
765 | */ | |
766 | static int number_prefix(const char *sym) | |
767 | { | |
768 | if (*sym++ == '\0') | |
769 | return 1; | |
770 | if (*sym != '.') | |
771 | return 0; | |
772 | do { | |
773 | char c = *sym++; | |
774 | if (c < '0' || c > '9') | |
775 | return 0; | |
776 | } while (*sym); | |
777 | return 1; | |
778 | } | |
779 | ||
780 | /* The pattern is an array of simple patterns. | |
781 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 782 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
783 | * "foo*" will match a string that begins with "foo" |
784 | * "foo$" will match a string equal to "foo" or "foo.1" | |
785 | * where the '1' can be any number including several digits. | |
786 | * The $ syntax is for sections where ld append a dot number | |
787 | * to make section name unique. | |
788 | */ | |
5c725138 | 789 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
790 | { |
791 | const char *p; | |
792 | while (*pat) { | |
793 | p = *pat++; | |
794 | const char *endp = p + strlen(p) - 1; | |
795 | ||
6c5bd235 SR |
796 | /* "*foo" */ |
797 | if (*p == '*') { | |
798 | if (strrcmp(sym, p + 1) == 0) | |
799 | return 1; | |
800 | } | |
10668220 | 801 | /* "foo*" */ |
6c5bd235 | 802 | else if (*endp == '*') { |
10668220 SR |
803 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
804 | return 1; | |
805 | } | |
806 | /* "foo$" */ | |
807 | else if (*endp == '$') { | |
808 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
809 | if (number_prefix(sym + strlen(p) - 1)) | |
810 | return 1; | |
811 | } | |
812 | } | |
813 | /* no wildcards */ | |
814 | else { | |
815 | if (strcmp(p, sym) == 0) | |
816 | return 1; | |
817 | } | |
818 | } | |
819 | /* no match */ | |
820 | return 0; | |
821 | } | |
822 | ||
10668220 SR |
823 | /* sections that we do not want to do full section mismatch check on */ |
824 | static const char *section_white_list[] = | |
4391ed6a SR |
825 | { |
826 | ".comment*", | |
827 | ".debug*", | |
1121584f | 828 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 829 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 830 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
831 | ".mdebug*", /* alpha, score, mips etc. */ |
832 | ".pdr", /* alpha, score, mips etc. */ | |
833 | ".stab*", | |
834 | ".note*", | |
835 | ".got*", | |
836 | ".toc*", | |
af42e970 MF |
837 | ".xt.prop", /* xtensa */ |
838 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
839 | ".arcextmap*", /* arc */ |
840 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
4391ed6a SR |
841 | NULL |
842 | }; | |
10668220 | 843 | |
e241a630 | 844 | /* |
b614a697 | 845 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 846 | * The cause of this is often a section specified in assembler |
b614a697 | 847 | * without "ax" / "aw". |
e241a630 | 848 | */ |
b614a697 AK |
849 | static void check_section(const char *modname, struct elf_info *elf, |
850 | Elf_Shdr *sechdr) | |
e241a630 | 851 | { |
b614a697 AK |
852 | const char *sec = sech_name(elf, sechdr); |
853 | ||
854 | if (sechdr->sh_type == SHT_PROGBITS && | |
855 | !(sechdr->sh_flags & SHF_ALLOC) && | |
856 | !match(sec, section_white_list)) { | |
857 | warn("%s (%s): unexpected non-allocatable section.\n" | |
858 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
859 | "Note that for example <linux/init.h> contains\n" | |
860 | "section definitions for use in .S files.\n\n", | |
861 | modname, sec); | |
e241a630 | 862 | } |
e241a630 SR |
863 | } |
864 | ||
865 | ||
866 | ||
eb8f6890 | 867 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d | 868 | ".init.setup$", ".init.rodata$", \ |
92e9e6d1 GKH |
869 | ".cpuinit.rodata$", ".meminit.rodata$", \ |
870 | ".init.data$", ".cpuinit.data$", ".meminit.data$" | |
eb8f6890 | 871 | #define ALL_EXIT_DATA_SECTIONS \ |
92e9e6d1 | 872 | ".exit.data$", ".cpuexit.data$", ".memexit.data$" |
10668220 | 873 | |
eb8f6890 | 874 | #define ALL_INIT_TEXT_SECTIONS \ |
92e9e6d1 | 875 | ".init.text$", ".cpuinit.text$", ".meminit.text$" |
eb8f6890 | 876 | #define ALL_EXIT_TEXT_SECTIONS \ |
92e9e6d1 | 877 | ".exit.text$", ".cpuexit.text$", ".memexit.text$" |
10668220 | 878 | |
bb15d8db SAS |
879 | #define ALL_PCI_INIT_SECTIONS \ |
880 | ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \ | |
881 | ".pci_fixup_enable$", ".pci_fixup_resume$", \ | |
882 | ".pci_fixup_resume_early$", ".pci_fixup_suspend$" | |
883 | ||
92e9e6d1 GKH |
884 | #define ALL_XXXINIT_SECTIONS CPU_INIT_SECTIONS, MEM_INIT_SECTIONS |
885 | #define ALL_XXXEXIT_SECTIONS CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS | |
4a31a229 UKK |
886 | |
887 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
888 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 889 | |
6c5bd235 | 890 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
891 | #define TEXT_SECTIONS ".text$" |
892 | ||
fd6c3a8d | 893 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d JB |
894 | #define CPU_INIT_SECTIONS ".cpuinit.*" |
895 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 896 | |
fd6c3a8d | 897 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d JB |
898 | #define CPU_EXIT_SECTIONS ".cpuexit.*" |
899 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 900 | |
6c5bd235 | 901 | /* init data sections */ |
eb8f6890 | 902 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
903 | |
904 | /* all init sections */ | |
eb8f6890 | 905 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
906 | |
907 | /* All init and exit sections (code + data) */ | |
908 | static const char *init_exit_sections[] = | |
eb8f6890 | 909 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
910 | |
911 | /* data section */ | |
912 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
913 | ||
6c5bd235 SR |
914 | |
915 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
916 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
917 | "*driver", \ | |
918 | "*_template", /* scsi uses *_template a lot */ \ | |
919 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
920 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
921 | "*_ops", \ | |
922 | "*_probe", \ | |
923 | "*_probe_one", \ | |
924 | "*_console" | |
6c5bd235 SR |
925 | |
926 | static const char *head_sections[] = { ".head.text*", NULL }; | |
927 | static const char *linker_symbols[] = | |
928 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
929 | ||
588ccd73 | 930 | enum mismatch { |
bbd3f4fb UKK |
931 | TEXT_TO_ANY_INIT, |
932 | DATA_TO_ANY_INIT, | |
933 | TEXT_TO_ANY_EXIT, | |
934 | DATA_TO_ANY_EXIT, | |
935 | XXXINIT_TO_SOME_INIT, | |
936 | XXXEXIT_TO_SOME_EXIT, | |
937 | ANY_INIT_TO_ANY_EXIT, | |
938 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
939 | EXPORT_TO_INIT_EXIT, |
940 | }; | |
941 | ||
10668220 SR |
942 | struct sectioncheck { |
943 | const char *fromsec[20]; | |
944 | const char *tosec[20]; | |
588ccd73 | 945 | enum mismatch mismatch; |
af92a82d | 946 | const char *symbol_white_list[20]; |
10668220 SR |
947 | }; |
948 | ||
949 | const struct sectioncheck sectioncheck[] = { | |
950 | /* Do not reference init/exit code/data from | |
951 | * normal code and data | |
952 | */ | |
953 | { | |
588ccd73 SR |
954 | .fromsec = { TEXT_SECTIONS, NULL }, |
955 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 956 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 957 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
958 | }, |
959 | { | |
960 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 961 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 962 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 963 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 964 | }, |
0db25245 UKK |
965 | { |
966 | .fromsec = { DATA_SECTIONS, NULL }, | |
967 | .tosec = { INIT_SECTIONS, NULL }, | |
968 | .mismatch = DATA_TO_ANY_INIT, | |
969 | .symbol_white_list = { | |
970 | "*_template", "*_timer", "*_sht", "*_ops", | |
971 | "*_probe", "*_probe_one", "*_console", NULL | |
972 | }, | |
973 | }, | |
588ccd73 SR |
974 | { |
975 | .fromsec = { TEXT_SECTIONS, NULL }, | |
976 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 977 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 978 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
979 | }, |
980 | { | |
981 | .fromsec = { DATA_SECTIONS, NULL }, | |
982 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 983 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 984 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 985 | }, |
92e9e6d1 | 986 | /* Do not reference init code/data from cpuinit/meminit code/data */ |
eb8f6890 | 987 | { |
4a31a229 | 988 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 989 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 990 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 991 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 992 | }, |
fd6c3a8d JB |
993 | /* Do not reference cpuinit code/data from meminit code/data */ |
994 | { | |
995 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
996 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 997 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 998 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
999 | }, |
1000 | /* Do not reference meminit code/data from cpuinit code/data */ | |
1001 | { | |
1002 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
1003 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 1004 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 1005 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 1006 | }, |
92e9e6d1 | 1007 | /* Do not reference exit code/data from cpuexit/memexit code/data */ |
eb8f6890 | 1008 | { |
4a31a229 | 1009 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 1010 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1011 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1012 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1013 | }, |
fd6c3a8d JB |
1014 | /* Do not reference cpuexit code/data from memexit code/data */ |
1015 | { | |
1016 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
1017 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1018 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1019 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
1020 | }, |
1021 | /* Do not reference memexit code/data from cpuexit code/data */ | |
1022 | { | |
1023 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
1024 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1025 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1026 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 1027 | }, |
10668220 SR |
1028 | /* Do not use exit code/data from init code */ |
1029 | { | |
eb8f6890 SR |
1030 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
1031 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1032 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 1033 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1034 | }, |
1035 | /* Do not use init code/data from exit code */ | |
1036 | { | |
eb8f6890 | 1037 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 1038 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1039 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1040 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1041 | }, |
bb15d8db SAS |
1042 | { |
1043 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
1044 | .tosec = { INIT_SECTIONS, NULL }, | |
1045 | .mismatch = ANY_INIT_TO_ANY_EXIT, | |
1046 | .symbol_white_list = { NULL }, | |
1047 | }, | |
10668220 SR |
1048 | /* Do not export init/exit functions or data */ |
1049 | { | |
1050 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1051 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1052 | .mismatch = EXPORT_TO_INIT_EXIT, |
1053 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1054 | } |
1055 | }; | |
1056 | ||
0d2a636e UKK |
1057 | static const struct sectioncheck *section_mismatch( |
1058 | const char *fromsec, const char *tosec) | |
10668220 SR |
1059 | { |
1060 | int i; | |
1061 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1062 | const struct sectioncheck *check = §ioncheck[0]; | |
1063 | ||
1064 | for (i = 0; i < elems; i++) { | |
1065 | if (match(fromsec, check->fromsec) && | |
1066 | match(tosec, check->tosec)) | |
0d2a636e | 1067 | return check; |
10668220 SR |
1068 | check++; |
1069 | } | |
0d2a636e | 1070 | return NULL; |
10668220 SR |
1071 | } |
1072 | ||
4c8fbca5 SR |
1073 | /** |
1074 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1075 | * |
4c8fbca5 SR |
1076 | * Pattern 1: |
1077 | * If a module parameter is declared __initdata and permissions=0 | |
1078 | * then this is legal despite the warning generated. | |
1079 | * We cannot see value of permissions here, so just ignore | |
1080 | * this pattern. | |
1081 | * The pattern is identified by: | |
1082 | * tosec = .init.data | |
9209aed0 | 1083 | * fromsec = .data* |
4c8fbca5 | 1084 | * atsym =__param* |
62070fa4 | 1085 | * |
6a841528 RR |
1086 | * Pattern 1a: |
1087 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1088 | * The pattern is identified by: | |
1089 | * tosec = .init.text | |
1090 | * fromsec = .data* | |
1091 | * atsym = __param_ops_* | |
1092 | * | |
4c8fbca5 | 1093 | * Pattern 2: |
72ee59b5 | 1094 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1095 | * add, remove, probe functions etc. |
92e9e6d1 | 1096 | * These functions may often be marked __cpuinit and we do not want to |
4c8fbca5 SR |
1097 | * warn here. |
1098 | * the pattern is identified by: | |
83cda2bb SR |
1099 | * tosec = init or exit section |
1100 | * fromsec = data section | |
df578e7d SR |
1101 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1102 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1103 | * |
1104 | * Pattern 3: | |
c993971f | 1105 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1106 | * |
1d8af559 | 1107 | * Pattern 4: |
ee6a8545 VG |
1108 | * Some symbols belong to init section but still it is ok to reference |
1109 | * these from non-init sections as these symbols don't have any memory | |
1110 | * allocated for them and symbol address and value are same. So even | |
1111 | * if init section is freed, its ok to reference those symbols. | |
1112 | * For ex. symbols marking the init section boundaries. | |
1113 | * This pattern is identified by | |
1114 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1115 | * |
4c8fbca5 | 1116 | **/ |
af92a82d UKK |
1117 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1118 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1119 | const char *tosec, const char *tosym) |
4c8fbca5 | 1120 | { |
4c8fbca5 | 1121 | /* Check for pattern 1 */ |
6c5bd235 SR |
1122 | if (match(tosec, init_data_sections) && |
1123 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1124 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1125 | return 0; | |
4c8fbca5 | 1126 | |
6a841528 RR |
1127 | /* Check for pattern 1a */ |
1128 | if (strcmp(tosec, ".init.text") == 0 && | |
1129 | match(fromsec, data_sections) && | |
1130 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1131 | return 0; | |
1132 | ||
4c8fbca5 | 1133 | /* Check for pattern 2 */ |
6c5bd235 SR |
1134 | if (match(tosec, init_exit_sections) && |
1135 | match(fromsec, data_sections) && | |
af92a82d | 1136 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1137 | return 0; |
4c8fbca5 | 1138 | |
9bf8cb9b | 1139 | /* Check for pattern 3 */ |
6c5bd235 SR |
1140 | if (match(fromsec, head_sections) && |
1141 | match(tosec, init_sections)) | |
58fb0d4f | 1142 | return 0; |
9bf8cb9b | 1143 | |
1d8af559 | 1144 | /* Check for pattern 4 */ |
58fb0d4f SR |
1145 | if (match(tosym, linker_symbols)) |
1146 | return 0; | |
9bf8cb9b | 1147 | |
58fb0d4f | 1148 | return 1; |
4c8fbca5 SR |
1149 | } |
1150 | ||
93684d3b SR |
1151 | /** |
1152 | * Find symbol based on relocation record info. | |
1153 | * In some cases the symbol supplied is a valid symbol so | |
1154 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1155 | * In other cases the symbol needs to be looked up in the symbol table | |
1156 | * based on section and address. | |
1157 | * **/ | |
9ad21c3f | 1158 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1159 | Elf_Sym *relsym) |
1160 | { | |
1161 | Elf_Sym *sym; | |
9ad21c3f SR |
1162 | Elf_Sym *near = NULL; |
1163 | Elf64_Sword distance = 20; | |
1164 | Elf64_Sword d; | |
1ce53adf | 1165 | unsigned int relsym_secindex; |
93684d3b SR |
1166 | |
1167 | if (relsym->st_name != 0) | |
1168 | return relsym; | |
1ce53adf DV |
1169 | |
1170 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1171 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1172 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1173 | continue; |
ae4ac123 AN |
1174 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1175 | continue; | |
93684d3b SR |
1176 | if (sym->st_value == addr) |
1177 | return sym; | |
9ad21c3f SR |
1178 | /* Find a symbol nearby - addr are maybe negative */ |
1179 | d = sym->st_value - addr; | |
1180 | if (d < 0) | |
1181 | d = addr - sym->st_value; | |
1182 | if (d < distance) { | |
1183 | distance = d; | |
1184 | near = sym; | |
1185 | } | |
93684d3b | 1186 | } |
9ad21c3f SR |
1187 | /* We need a close match */ |
1188 | if (distance < 20) | |
1189 | return near; | |
1190 | else | |
1191 | return NULL; | |
93684d3b SR |
1192 | } |
1193 | ||
da68d61f DB |
1194 | static inline int is_arm_mapping_symbol(const char *str) |
1195 | { | |
1196 | return str[0] == '$' && strchr("atd", str[1]) | |
1197 | && (str[2] == '\0' || str[2] == '.'); | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1202 | * one of the magic symbols emitted used by current ARM tools. | |
1203 | * | |
1204 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1205 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1206 | * only by merging __exit and __init sections into __text, bloating | |
1207 | * the kernel (which is especially evil on embedded platforms). | |
1208 | */ | |
1209 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1210 | { | |
1211 | const char *name = elf->strtab + sym->st_name; | |
1212 | ||
1213 | if (!name || !strlen(name)) | |
1214 | return 0; | |
1215 | return !is_arm_mapping_symbol(name); | |
1216 | } | |
1217 | ||
b39927cf | 1218 | /* |
43c74d17 SR |
1219 | * Find symbols before or equal addr and after addr - in the section sec. |
1220 | * If we find two symbols with equal offset prefer one with a valid name. | |
1221 | * The ELF format may have a better way to detect what type of symbol | |
1222 | * it is, but this works for now. | |
b39927cf | 1223 | **/ |
157c23c8 SR |
1224 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1225 | const char *sec) | |
b39927cf SR |
1226 | { |
1227 | Elf_Sym *sym; | |
157c23c8 | 1228 | Elf_Sym *near = NULL; |
157c23c8 | 1229 | Elf_Addr distance = ~0; |
62070fa4 | 1230 | |
b39927cf SR |
1231 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1232 | const char *symsec; | |
1233 | ||
1ce53adf | 1234 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1235 | continue; |
1ce53adf | 1236 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1237 | if (strcmp(symsec, sec) != 0) |
1238 | continue; | |
da68d61f DB |
1239 | if (!is_valid_name(elf, sym)) |
1240 | continue; | |
b39927cf | 1241 | if (sym->st_value <= addr) { |
157c23c8 SR |
1242 | if ((addr - sym->st_value) < distance) { |
1243 | distance = addr - sym->st_value; | |
1244 | near = sym; | |
1245 | } else if ((addr - sym->st_value) == distance) { | |
1246 | near = sym; | |
43c74d17 | 1247 | } |
b39927cf SR |
1248 | } |
1249 | } | |
157c23c8 | 1250 | return near; |
b39927cf SR |
1251 | } |
1252 | ||
588ccd73 SR |
1253 | /* |
1254 | * Convert a section name to the function/data attribute | |
1255 | * .init.text => __init | |
1256 | * .cpuinit.data => __cpudata | |
1257 | * .memexitconst => __memconst | |
1258 | * etc. | |
cbcf14a9 AS |
1259 | * |
1260 | * The memory of returned value has been allocated on a heap. The user of this | |
1261 | * method should free it after usage. | |
588ccd73 SR |
1262 | */ |
1263 | static char *sec2annotation(const char *s) | |
1264 | { | |
1265 | if (match(s, init_exit_sections)) { | |
1266 | char *p = malloc(20); | |
1267 | char *r = p; | |
1268 | ||
1269 | *p++ = '_'; | |
1270 | *p++ = '_'; | |
1271 | if (*s == '.') | |
1272 | s++; | |
1273 | while (*s && *s != '.') | |
1274 | *p++ = *s++; | |
1275 | *p = '\0'; | |
1276 | if (*s == '.') | |
1277 | s++; | |
1278 | if (strstr(s, "rodata") != NULL) | |
1279 | strcat(p, "const "); | |
1280 | else if (strstr(s, "data") != NULL) | |
1281 | strcat(p, "data "); | |
1282 | else | |
1283 | strcat(p, " "); | |
cbcf14a9 | 1284 | return r; |
588ccd73 | 1285 | } else { |
5003bab8 | 1286 | return strdup(""); |
588ccd73 SR |
1287 | } |
1288 | } | |
1289 | ||
1290 | static int is_function(Elf_Sym *sym) | |
1291 | { | |
1292 | if (sym) | |
1293 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1294 | else | |
f666751a | 1295 | return -1; |
588ccd73 SR |
1296 | } |
1297 | ||
00759c0e RD |
1298 | static void print_section_list(const char * const list[20]) |
1299 | { | |
1300 | const char *const *s = list; | |
1301 | ||
1302 | while (*s) { | |
1303 | fprintf(stderr, "%s", *s); | |
1304 | s++; | |
1305 | if (*s) | |
1306 | fprintf(stderr, ", "); | |
1307 | } | |
1308 | fprintf(stderr, "\n"); | |
1309 | } | |
1310 | ||
58fb0d4f | 1311 | /* |
b39927cf SR |
1312 | * Print a warning about a section mismatch. |
1313 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1314 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1315 | */ |
0d2a636e UKK |
1316 | static void report_sec_mismatch(const char *modname, |
1317 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1318 | const char *fromsec, |
1319 | unsigned long long fromaddr, | |
1320 | const char *fromsym, | |
588ccd73 SR |
1321 | int from_is_func, |
1322 | const char *tosec, const char *tosym, | |
1323 | int to_is_func) | |
1324 | { | |
1325 | const char *from, *from_p; | |
1326 | const char *to, *to_p; | |
37ed19d5 AF |
1327 | char *prl_from; |
1328 | char *prl_to; | |
f666751a SR |
1329 | |
1330 | switch (from_is_func) { | |
1331 | case 0: from = "variable"; from_p = ""; break; | |
1332 | case 1: from = "function"; from_p = "()"; break; | |
1333 | default: from = "(unknown reference)"; from_p = ""; break; | |
1334 | } | |
1335 | switch (to_is_func) { | |
1336 | case 0: to = "variable"; to_p = ""; break; | |
1337 | case 1: to = "function"; to_p = "()"; break; | |
1338 | default: to = "(unknown reference)"; to_p = ""; break; | |
1339 | } | |
588ccd73 | 1340 | |
e5f95c8b SR |
1341 | sec_mismatch_count++; |
1342 | if (!sec_mismatch_verbose) | |
1343 | return; | |
1344 | ||
7c0ac495 GU |
1345 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1346 | "to the %s %s:%s%s\n", | |
1347 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1348 | tosym, to_p); | |
588ccd73 | 1349 | |
0d2a636e | 1350 | switch (mismatch->mismatch) { |
bbd3f4fb | 1351 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1352 | prl_from = sec2annotation(fromsec); |
1353 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1354 | fprintf(stderr, |
f666751a | 1355 | "The function %s%s() references\n" |
588ccd73 SR |
1356 | "the %s %s%s%s.\n" |
1357 | "This is often because %s lacks a %s\n" | |
1358 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1359 | prl_from, fromsym, |
1360 | to, prl_to, tosym, to_p, | |
1361 | fromsym, prl_to, tosym); | |
1362 | free(prl_from); | |
1363 | free(prl_to); | |
588ccd73 | 1364 | break; |
bbd3f4fb | 1365 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1366 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1367 | fprintf(stderr, |
1368 | "The variable %s references\n" | |
1369 | "the %s %s%s%s\n" | |
1370 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1371 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1372 | "or name the variable:\n", |
37ed19d5 | 1373 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1374 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1375 | free(prl_to); |
588ccd73 | 1376 | break; |
58fb0d4f | 1377 | } |
bbd3f4fb | 1378 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1379 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1380 | fprintf(stderr, |
1381 | "The function %s() references a %s in an exit section.\n" | |
1382 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1383 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1384 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1385 | free(prl_to); | |
588ccd73 | 1386 | break; |
bbd3f4fb | 1387 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1388 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1389 | fprintf(stderr, |
1390 | "The variable %s references\n" | |
1391 | "the %s %s%s%s\n" | |
1392 | "If the reference is valid then annotate the\n" | |
1393 | "variable with __exit* (see linux/init.h) or " | |
1394 | "name the variable:\n", | |
37ed19d5 | 1395 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1396 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1397 | free(prl_to); |
588ccd73 SR |
1398 | break; |
1399 | } | |
bbd3f4fb UKK |
1400 | case XXXINIT_TO_SOME_INIT: |
1401 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1402 | prl_from = sec2annotation(fromsec); |
1403 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1404 | fprintf(stderr, |
1405 | "The %s %s%s%s references\n" | |
1406 | "a %s %s%s%s.\n" | |
1407 | "If %s is only used by %s then\n" | |
1408 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1409 | from, prl_from, fromsym, from_p, |
1410 | to, prl_to, tosym, to_p, | |
b1d2675a | 1411 | tosym, fromsym, tosym); |
37ed19d5 AF |
1412 | free(prl_from); |
1413 | free(prl_to); | |
588ccd73 | 1414 | break; |
bbd3f4fb | 1415 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1416 | prl_from = sec2annotation(fromsec); |
1417 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1418 | fprintf(stderr, |
1419 | "The %s %s%s%s references\n" | |
1420 | "a %s %s%s%s.\n" | |
1421 | "This is often seen when error handling " | |
1422 | "in the init function\n" | |
1423 | "uses functionality in the exit path.\n" | |
1424 | "The fix is often to remove the %sannotation of\n" | |
1425 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1426 | from, prl_from, fromsym, from_p, |
1427 | to, prl_to, tosym, to_p, | |
5003bab8 | 1428 | prl_to, tosym, to_p); |
37ed19d5 AF |
1429 | free(prl_from); |
1430 | free(prl_to); | |
588ccd73 | 1431 | break; |
bbd3f4fb | 1432 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1433 | prl_from = sec2annotation(fromsec); |
1434 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1435 | fprintf(stderr, |
1436 | "The %s %s%s%s references\n" | |
1437 | "a %s %s%s%s.\n" | |
1438 | "This is often seen when error handling " | |
1439 | "in the exit function\n" | |
1440 | "uses functionality in the init path.\n" | |
1441 | "The fix is often to remove the %sannotation of\n" | |
1442 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1443 | from, prl_from, fromsym, from_p, |
1444 | to, prl_to, tosym, to_p, | |
1445 | prl_to, tosym, to_p); | |
1446 | free(prl_from); | |
1447 | free(prl_to); | |
588ccd73 SR |
1448 | break; |
1449 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1450 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1451 | fprintf(stderr, |
1452 | "The symbol %s is exported and annotated %s\n" | |
1453 | "Fix this by removing the %sannotation of %s " | |
1454 | "or drop the export.\n", | |
37ed19d5 AF |
1455 | tosym, prl_to, prl_to, tosym); |
1456 | free(prl_to); | |
588ccd73 SR |
1457 | break; |
1458 | } | |
1459 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1460 | } |
1461 | ||
1462 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1463 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1464 | { | |
1465 | const char *tosec; | |
0d2a636e | 1466 | const struct sectioncheck *mismatch; |
58fb0d4f | 1467 | |
1ce53adf | 1468 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1469 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1470 | if (mismatch) { |
588ccd73 SR |
1471 | Elf_Sym *to; |
1472 | Elf_Sym *from; | |
58fb0d4f | 1473 | const char *tosym; |
588ccd73 | 1474 | const char *fromsym; |
58fb0d4f | 1475 | |
588ccd73 SR |
1476 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1477 | fromsym = sym_name(elf, from); | |
1478 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1479 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1480 | |
1481 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1482 | if (secref_whitelist(mismatch, |
1483 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1484 | report_sec_mismatch(modname, mismatch, |
1485 | fromsec, r->r_offset, fromsym, | |
1486 | is_function(from), tosec, tosym, | |
1487 | is_function(to)); | |
58fb0d4f | 1488 | } |
b39927cf SR |
1489 | } |
1490 | } | |
1491 | ||
ae4ac123 | 1492 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1493 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1494 | { |
1495 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1496 | int section = sechdr->sh_info; |
ae4ac123 AN |
1497 | |
1498 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1499 | r->r_offset; |
ae4ac123 AN |
1500 | } |
1501 | ||
5b24c071 | 1502 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1503 | { |
1504 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1505 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1506 | |
1507 | switch (r_typ) { | |
1508 | case R_386_32: | |
1509 | r->r_addend = TO_NATIVE(*location); | |
1510 | break; | |
1511 | case R_386_PC32: | |
1512 | r->r_addend = TO_NATIVE(*location) + 4; | |
1513 | /* For CONFIG_RELOCATABLE=y */ | |
1514 | if (elf->hdr->e_type == ET_EXEC) | |
1515 | r->r_addend += r->r_offset; | |
1516 | break; | |
1517 | } | |
1518 | return 0; | |
1519 | } | |
1520 | ||
6e2e340b TL |
1521 | #ifndef R_ARM_CALL |
1522 | #define R_ARM_CALL 28 | |
1523 | #endif | |
1524 | #ifndef R_ARM_JUMP24 | |
1525 | #define R_ARM_JUMP24 29 | |
1526 | #endif | |
1527 | ||
5b24c071 | 1528 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1529 | { |
1530 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1531 | ||
1532 | switch (r_typ) { | |
1533 | case R_ARM_ABS32: | |
1534 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1535 | r->r_addend = (int)(long) |
1536 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1537 | break; |
1538 | case R_ARM_PC24: | |
6e2e340b TL |
1539 | case R_ARM_CALL: |
1540 | case R_ARM_JUMP24: | |
56a974fa | 1541 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1542 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1543 | sechdr->sh_offset + |
1544 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1545 | break; |
1546 | default: | |
1547 | return 1; | |
1548 | } | |
1549 | return 0; | |
1550 | } | |
1551 | ||
5b24c071 | 1552 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1553 | { |
1554 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1555 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1556 | unsigned int inst; |
1557 | ||
1558 | if (r_typ == R_MIPS_HI16) | |
1559 | return 1; /* skip this */ | |
1560 | inst = TO_NATIVE(*location); | |
1561 | switch (r_typ) { | |
1562 | case R_MIPS_LO16: | |
1563 | r->r_addend = inst & 0xffff; | |
1564 | break; | |
1565 | case R_MIPS_26: | |
1566 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1567 | break; | |
1568 | case R_MIPS_32: | |
1569 | r->r_addend = inst; | |
1570 | break; | |
1571 | } | |
1572 | return 0; | |
1573 | } | |
1574 | ||
5b24c071 | 1575 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1576 | Elf_Shdr *sechdr) |
5b24c071 SR |
1577 | { |
1578 | Elf_Sym *sym; | |
1579 | Elf_Rela *rela; | |
1580 | Elf_Rela r; | |
1581 | unsigned int r_sym; | |
1582 | const char *fromsec; | |
5b24c071 | 1583 | |
ff13f926 | 1584 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1585 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1586 | ||
ff13f926 | 1587 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1588 | fromsec += strlen(".rela"); |
1589 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1590 | if (match(fromsec, section_white_list)) |
5b24c071 | 1591 | return; |
e241a630 | 1592 | |
5b24c071 SR |
1593 | for (rela = start; rela < stop; rela++) { |
1594 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1595 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1596 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1597 | unsigned int r_typ; |
1598 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1599 | r_sym = TO_NATIVE(r_sym); | |
1600 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1601 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1602 | } else { | |
1603 | r.r_info = TO_NATIVE(rela->r_info); | |
1604 | r_sym = ELF_R_SYM(r.r_info); | |
1605 | } | |
1606 | #else | |
1607 | r.r_info = TO_NATIVE(rela->r_info); | |
1608 | r_sym = ELF_R_SYM(r.r_info); | |
1609 | #endif | |
1610 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1611 | sym = elf->symtab_start + r_sym; | |
1612 | /* Skip special sections */ | |
1ce53adf | 1613 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1614 | continue; |
58fb0d4f | 1615 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1616 | } |
1617 | } | |
1618 | ||
1619 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1620 | Elf_Shdr *sechdr) |
5b24c071 SR |
1621 | { |
1622 | Elf_Sym *sym; | |
1623 | Elf_Rel *rel; | |
1624 | Elf_Rela r; | |
1625 | unsigned int r_sym; | |
1626 | const char *fromsec; | |
5b24c071 | 1627 | |
ff13f926 | 1628 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1629 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1630 | ||
ff13f926 | 1631 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1632 | fromsec += strlen(".rel"); |
1633 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1634 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1635 | return; |
1636 | ||
1637 | for (rel = start; rel < stop; rel++) { | |
1638 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1639 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1640 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1641 | unsigned int r_typ; |
1642 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1643 | r_sym = TO_NATIVE(r_sym); | |
1644 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1645 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1646 | } else { | |
1647 | r.r_info = TO_NATIVE(rel->r_info); | |
1648 | r_sym = ELF_R_SYM(r.r_info); | |
1649 | } | |
1650 | #else | |
1651 | r.r_info = TO_NATIVE(rel->r_info); | |
1652 | r_sym = ELF_R_SYM(r.r_info); | |
1653 | #endif | |
1654 | r.r_addend = 0; | |
ff13f926 | 1655 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1656 | case EM_386: |
1657 | if (addend_386_rel(elf, sechdr, &r)) | |
1658 | continue; | |
1659 | break; | |
1660 | case EM_ARM: | |
1661 | if (addend_arm_rel(elf, sechdr, &r)) | |
1662 | continue; | |
1663 | break; | |
1664 | case EM_MIPS: | |
1665 | if (addend_mips_rel(elf, sechdr, &r)) | |
1666 | continue; | |
1667 | break; | |
1668 | } | |
1669 | sym = elf->symtab_start + r_sym; | |
1670 | /* Skip special sections */ | |
1ce53adf | 1671 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1672 | continue; |
58fb0d4f | 1673 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1674 | } |
1675 | } | |
1676 | ||
b39927cf SR |
1677 | /** |
1678 | * A module includes a number of sections that are discarded | |
1679 | * either when loaded or when used as built-in. | |
1680 | * For loaded modules all functions marked __init and all data | |
b595076a | 1681 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1682 | * Likewise for modules used built-in the sections marked __exit |
1683 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1684 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1685 | * The check_sec_ref() function traverses all relocation records |
1686 | * to find all references to a section that reference a section that will | |
1687 | * be discarded and warns about it. | |
1688 | **/ | |
1689 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1690 | struct elf_info *elf) |
b39927cf SR |
1691 | { |
1692 | int i; | |
b39927cf | 1693 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1694 | |
b39927cf | 1695 | /* Walk through all sections */ |
1ce53adf | 1696 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1697 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1698 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1699 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1700 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1701 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1702 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1703 | } |
1704 | } | |
1705 | ||
5c3ead8c | 1706 | static void read_symbols(char *modname) |
1da177e4 LT |
1707 | { |
1708 | const char *symname; | |
1709 | char *version; | |
b817f6fe | 1710 | char *license; |
1da177e4 LT |
1711 | struct module *mod; |
1712 | struct elf_info info = { }; | |
1713 | Elf_Sym *sym; | |
1714 | ||
85bd2fdd SR |
1715 | if (!parse_elf(&info, modname)) |
1716 | return; | |
1da177e4 LT |
1717 | |
1718 | mod = new_module(modname); | |
1719 | ||
1720 | /* When there's no vmlinux, don't print warnings about | |
1721 | * unresolved symbols (since there'll be too many ;) */ | |
1722 | if (is_vmlinux(modname)) { | |
1da177e4 | 1723 | have_vmlinux = 1; |
1da177e4 LT |
1724 | mod->skip = 1; |
1725 | } | |
1726 | ||
b817f6fe | 1727 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1728 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1729 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1730 | "see include/linux/module.h for " | |
1731 | "more information\n", modname); | |
b817f6fe SR |
1732 | while (license) { |
1733 | if (license_is_gpl_compatible(license)) | |
1734 | mod->gpl_compatible = 1; | |
1735 | else { | |
1736 | mod->gpl_compatible = 0; | |
1737 | break; | |
1738 | } | |
1739 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1740 | "license", license); | |
1741 | } | |
1742 | ||
1da177e4 LT |
1743 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1744 | symname = info.strtab + sym->st_name; | |
1745 | ||
1746 | handle_modversions(mod, &info, sym, symname); | |
1747 | handle_moddevtable(mod, &info, sym, symname); | |
1748 | } | |
d1f25e66 | 1749 | if (!is_vmlinux(modname) || |
10668220 SR |
1750 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1751 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1752 | |
1753 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1754 | if (version) | |
1755 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1756 | version - (char *)info.hdr); | |
1757 | if (version || (all_versions && !is_vmlinux(modname))) | |
1758 | get_src_version(modname, mod->srcversion, | |
1759 | sizeof(mod->srcversion)-1); | |
1760 | ||
1761 | parse_elf_finish(&info); | |
1762 | ||
8c8ef42a | 1763 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1764 | * never passed as an argument to an exported function, so |
1765 | * the automatic versioning doesn't pick it up, but it's really | |
1766 | * important anyhow */ | |
1767 | if (modversions) | |
8c8ef42a | 1768 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1769 | } |
1770 | ||
712f9b46 RR |
1771 | static void read_symbols_from_files(const char *filename) |
1772 | { | |
1773 | FILE *in = stdin; | |
1774 | char fname[PATH_MAX]; | |
1775 | ||
1776 | if (strcmp(filename, "-") != 0) { | |
1777 | in = fopen(filename, "r"); | |
1778 | if (!in) | |
1779 | fatal("Can't open filenames file %s: %m", filename); | |
1780 | } | |
1781 | ||
1782 | while (fgets(fname, PATH_MAX, in) != NULL) { | |
1783 | if (strends(fname, "\n")) | |
1784 | fname[strlen(fname)-1] = '\0'; | |
1785 | read_symbols(fname); | |
1786 | } | |
1787 | ||
1788 | if (in != stdin) | |
1789 | fclose(in); | |
1790 | } | |
1791 | ||
1da177e4 LT |
1792 | #define SZ 500 |
1793 | ||
1794 | /* We first write the generated file into memory using the | |
1795 | * following helper, then compare to the file on disk and | |
1796 | * only update the later if anything changed */ | |
1797 | ||
5c3ead8c SR |
1798 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1799 | const char *fmt, ...) | |
1da177e4 LT |
1800 | { |
1801 | char tmp[SZ]; | |
1802 | int len; | |
1803 | va_list ap; | |
62070fa4 | 1804 | |
1da177e4 LT |
1805 | va_start(ap, fmt); |
1806 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1807 | buf_write(buf, tmp, len); |
1da177e4 LT |
1808 | va_end(ap); |
1809 | } | |
1810 | ||
5c3ead8c | 1811 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1812 | { |
1813 | if (buf->size - buf->pos < len) { | |
7670f023 | 1814 | buf->size += len + SZ; |
1da177e4 LT |
1815 | buf->p = realloc(buf->p, buf->size); |
1816 | } | |
1817 | strncpy(buf->p + buf->pos, s, len); | |
1818 | buf->pos += len; | |
1819 | } | |
1820 | ||
c96fca21 SR |
1821 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1822 | { | |
1823 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1824 | ||
1825 | switch (exp) { | |
1826 | case export_gpl: | |
1827 | fatal("modpost: GPL-incompatible module %s%s " | |
1828 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1829 | break; | |
1830 | case export_unused_gpl: | |
1831 | fatal("modpost: GPL-incompatible module %s%s " | |
1832 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1833 | break; | |
1834 | case export_gpl_future: | |
1835 | warn("modpost: GPL-incompatible module %s%s " | |
1836 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1837 | break; | |
1838 | case export_plain: | |
1839 | case export_unused: | |
1840 | case export_unknown: | |
1841 | /* ignore */ | |
1842 | break; | |
1843 | } | |
1844 | } | |
1845 | ||
df578e7d | 1846 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1847 | { |
1848 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1849 | ||
1850 | switch (exp) { | |
1851 | case export_unused: | |
1852 | case export_unused_gpl: | |
1853 | warn("modpost: module %s%s " | |
1854 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1855 | break; | |
1856 | default: | |
1857 | /* ignore */ | |
1858 | break; | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1863 | { |
1864 | struct symbol *s, *exp; | |
1865 | ||
1866 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1867 | const char *basename; |
b817f6fe SR |
1868 | exp = find_symbol(s->name); |
1869 | if (!exp || exp->module == mod) | |
1870 | continue; | |
6449bd62 | 1871 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1872 | if (basename) |
1873 | basename++; | |
c96fca21 SR |
1874 | else |
1875 | basename = mod->name; | |
1876 | if (!mod->gpl_compatible) | |
1877 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1878 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1879 | } |
b817f6fe SR |
1880 | } |
1881 | ||
5c3ead8c SR |
1882 | /** |
1883 | * Header for the generated file | |
1884 | **/ | |
1885 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1886 | { |
1887 | buf_printf(b, "#include <linux/module.h>\n"); | |
1888 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1889 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1890 | buf_printf(b, "\n"); | |
1891 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1892 | buf_printf(b, "\n"); | |
1da177e4 LT |
1893 | buf_printf(b, "struct module __this_module\n"); |
1894 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
3c7ec94d | 1895 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 1896 | if (mod->has_init) |
3c7ec94d | 1897 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
1898 | if (mod->has_cleanup) |
1899 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 1900 | "\t.exit = cleanup_module,\n" |
1da177e4 | 1901 | "#endif\n"); |
3c7ec94d | 1902 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1903 | buf_printf(b, "};\n"); |
1904 | } | |
1905 | ||
2449b8ba BH |
1906 | static void add_intree_flag(struct buffer *b, int is_intree) |
1907 | { | |
1908 | if (is_intree) | |
1909 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
1910 | } | |
1911 | ||
5c725138 | 1912 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1913 | { |
1914 | static const char *staging_dir = "drivers/staging"; | |
1915 | ||
1916 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1917 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1918 | } | |
1919 | ||
5c3ead8c SR |
1920 | /** |
1921 | * Record CRCs for unresolved symbols | |
1922 | **/ | |
c53ddacd | 1923 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1924 | { |
1925 | struct symbol *s, *exp; | |
c53ddacd | 1926 | int err = 0; |
1da177e4 LT |
1927 | |
1928 | for (s = mod->unres; s; s = s->next) { | |
1929 | exp = find_symbol(s->name); | |
1930 | if (!exp || exp->module == mod) { | |
c53ddacd | 1931 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1932 | if (warn_unresolved) { |
1933 | warn("\"%s\" [%s.ko] undefined!\n", | |
1934 | s->name, mod->name); | |
1935 | } else { | |
1936 | merror("\"%s\" [%s.ko] undefined!\n", | |
1937 | s->name, mod->name); | |
1938 | err = 1; | |
1939 | } | |
c53ddacd | 1940 | } |
1da177e4 LT |
1941 | continue; |
1942 | } | |
1943 | s->module = exp->module; | |
1944 | s->crc_valid = exp->crc_valid; | |
1945 | s->crc = exp->crc; | |
1946 | } | |
1947 | ||
1948 | if (!modversions) | |
c53ddacd | 1949 | return err; |
1da177e4 LT |
1950 | |
1951 | buf_printf(b, "\n"); | |
1952 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1953 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1954 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1955 | ||
1956 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1957 | if (!s->module) |
1da177e4 | 1958 | continue; |
1da177e4 | 1959 | if (!s->crc_valid) { |
cb80514d | 1960 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1961 | s->name, mod->name); |
1962 | continue; | |
1963 | } | |
a53a11f3 | 1964 | buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", |
a4b6a77b | 1965 | s->crc, s->name); |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1969 | |
1970 | return err; | |
1da177e4 LT |
1971 | } |
1972 | ||
5c3ead8c SR |
1973 | static void add_depends(struct buffer *b, struct module *mod, |
1974 | struct module *modules) | |
1da177e4 LT |
1975 | { |
1976 | struct symbol *s; | |
1977 | struct module *m; | |
1978 | int first = 1; | |
1979 | ||
df578e7d | 1980 | for (m = modules; m; m = m->next) |
1da177e4 | 1981 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1982 | |
1983 | buf_printf(b, "\n"); | |
1984 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1985 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1986 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1987 | buf_printf(b, "\"depends="); | |
1988 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1989 | const char *p; |
1da177e4 LT |
1990 | if (!s->module) |
1991 | continue; | |
1992 | ||
1993 | if (s->module->seen) | |
1994 | continue; | |
1995 | ||
1996 | s->module->seen = 1; | |
df578e7d SR |
1997 | p = strrchr(s->module->name, '/'); |
1998 | if (p) | |
a61b2dfd SR |
1999 | p++; |
2000 | else | |
2001 | p = s->module->name; | |
2002 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
2003 | first = 0; |
2004 | } | |
2005 | buf_printf(b, "\";\n"); | |
2006 | } | |
2007 | ||
5c3ead8c | 2008 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
2009 | { |
2010 | if (mod->srcversion[0]) { | |
2011 | buf_printf(b, "\n"); | |
2012 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
2013 | mod->srcversion); | |
2014 | } | |
2015 | } | |
2016 | ||
5c3ead8c | 2017 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
2018 | { |
2019 | char *tmp; | |
2020 | FILE *file; | |
2021 | struct stat st; | |
2022 | ||
2023 | file = fopen(fname, "r"); | |
2024 | if (!file) | |
2025 | goto write; | |
2026 | ||
2027 | if (fstat(fileno(file), &st) < 0) | |
2028 | goto close_write; | |
2029 | ||
2030 | if (st.st_size != b->pos) | |
2031 | goto close_write; | |
2032 | ||
2033 | tmp = NOFAIL(malloc(b->pos)); | |
2034 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
2035 | goto free_write; | |
2036 | ||
2037 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2038 | goto free_write; | |
2039 | ||
2040 | free(tmp); | |
2041 | fclose(file); | |
2042 | return; | |
2043 | ||
2044 | free_write: | |
2045 | free(tmp); | |
2046 | close_write: | |
2047 | fclose(file); | |
2048 | write: | |
2049 | file = fopen(fname, "w"); | |
2050 | if (!file) { | |
2051 | perror(fname); | |
2052 | exit(1); | |
2053 | } | |
2054 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2055 | perror(fname); | |
2056 | exit(1); | |
2057 | } | |
2058 | fclose(file); | |
2059 | } | |
2060 | ||
bd5cbced | 2061 | /* parse Module.symvers file. line format: |
534b89a9 | 2062 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2063 | **/ |
040fcc81 | 2064 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2065 | { |
2066 | unsigned long size, pos = 0; | |
2067 | void *file = grab_file(fname, &size); | |
2068 | char *line; | |
2069 | ||
df578e7d | 2070 | if (!file) |
1da177e4 LT |
2071 | /* No symbol versions, silently ignore */ |
2072 | return; | |
2073 | ||
2074 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2075 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2076 | unsigned int crc; |
2077 | struct module *mod; | |
040fcc81 | 2078 | struct symbol *s; |
1da177e4 LT |
2079 | |
2080 | if (!(symname = strchr(line, '\t'))) | |
2081 | goto fail; | |
2082 | *symname++ = '\0'; | |
2083 | if (!(modname = strchr(symname, '\t'))) | |
2084 | goto fail; | |
2085 | *modname++ = '\0'; | |
9ac545b0 | 2086 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2087 | *export++ = '\0'; |
534b89a9 SR |
2088 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2089 | *end = '\0'; | |
1da177e4 LT |
2090 | crc = strtoul(line, &d, 16); |
2091 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2092 | goto fail; | |
df578e7d SR |
2093 | mod = find_module(modname); |
2094 | if (!mod) { | |
2095 | if (is_vmlinux(modname)) | |
1da177e4 | 2096 | have_vmlinux = 1; |
0fa3a88c | 2097 | mod = new_module(modname); |
1da177e4 LT |
2098 | mod->skip = 1; |
2099 | } | |
bd5cbced | 2100 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2101 | s->kernel = kernel; |
2102 | s->preloaded = 1; | |
bd5cbced | 2103 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2104 | } |
2105 | return; | |
2106 | fail: | |
2107 | fatal("parse error in symbol dump file\n"); | |
2108 | } | |
2109 | ||
040fcc81 SR |
2110 | /* For normal builds always dump all symbols. |
2111 | * For external modules only dump symbols | |
2112 | * that are not read from kernel Module.symvers. | |
2113 | **/ | |
2114 | static int dump_sym(struct symbol *sym) | |
2115 | { | |
2116 | if (!external_module) | |
2117 | return 1; | |
2118 | if (sym->vmlinux || sym->kernel) | |
2119 | return 0; | |
2120 | return 1; | |
2121 | } | |
62070fa4 | 2122 | |
5c3ead8c | 2123 | static void write_dump(const char *fname) |
1da177e4 LT |
2124 | { |
2125 | struct buffer buf = { }; | |
2126 | struct symbol *symbol; | |
2127 | int n; | |
2128 | ||
2129 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2130 | symbol = symbolhash[n]; | |
2131 | while (symbol) { | |
040fcc81 | 2132 | if (dump_sym(symbol)) |
bd5cbced | 2133 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2134 | symbol->crc, symbol->name, |
bd5cbced RP |
2135 | symbol->module->name, |
2136 | export_str(symbol->export)); | |
1da177e4 LT |
2137 | symbol = symbol->next; |
2138 | } | |
2139 | } | |
2140 | write_if_changed(&buf, fname); | |
2141 | } | |
2142 | ||
2d04b5ae RH |
2143 | struct ext_sym_list { |
2144 | struct ext_sym_list *next; | |
2145 | const char *file; | |
2146 | }; | |
2147 | ||
5c3ead8c | 2148 | int main(int argc, char **argv) |
1da177e4 LT |
2149 | { |
2150 | struct module *mod; | |
2151 | struct buffer buf = { }; | |
040fcc81 | 2152 | char *kernel_read = NULL, *module_read = NULL; |
712f9b46 | 2153 | char *dump_write = NULL, *files_source = NULL; |
1da177e4 | 2154 | int opt; |
c53ddacd | 2155 | int err; |
2d04b5ae RH |
2156 | struct ext_sym_list *extsym_iter; |
2157 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2158 | |
712f9b46 | 2159 | while ((opt = getopt(argc, argv, "i:I:e:msST:o:awM:K:")) != -1) { |
df578e7d SR |
2160 | switch (opt) { |
2161 | case 'i': | |
2162 | kernel_read = optarg; | |
2163 | break; | |
2164 | case 'I': | |
2165 | module_read = optarg; | |
2166 | external_module = 1; | |
2167 | break; | |
2d04b5ae RH |
2168 | case 'e': |
2169 | external_module = 1; | |
2170 | extsym_iter = | |
2171 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2172 | extsym_iter->next = extsym_start; | |
2173 | extsym_iter->file = optarg; | |
2174 | extsym_start = extsym_iter; | |
2175 | break; | |
df578e7d SR |
2176 | case 'm': |
2177 | modversions = 1; | |
2178 | break; | |
2179 | case 'o': | |
2180 | dump_write = optarg; | |
2181 | break; | |
2182 | case 'a': | |
2183 | all_versions = 1; | |
2184 | break; | |
2185 | case 's': | |
2186 | vmlinux_section_warnings = 0; | |
2187 | break; | |
588ccd73 SR |
2188 | case 'S': |
2189 | sec_mismatch_verbose = 0; | |
2190 | break; | |
712f9b46 RR |
2191 | case 'T': |
2192 | files_source = optarg; | |
2193 | break; | |
df578e7d SR |
2194 | case 'w': |
2195 | warn_unresolved = 1; | |
2196 | break; | |
2197 | default: | |
2198 | exit(1); | |
1da177e4 LT |
2199 | } |
2200 | } | |
2201 | ||
040fcc81 SR |
2202 | if (kernel_read) |
2203 | read_dump(kernel_read, 1); | |
2204 | if (module_read) | |
2205 | read_dump(module_read, 0); | |
2d04b5ae RH |
2206 | while (extsym_start) { |
2207 | read_dump(extsym_start->file, 0); | |
2208 | extsym_iter = extsym_start->next; | |
2209 | free(extsym_start); | |
2210 | extsym_start = extsym_iter; | |
2211 | } | |
1da177e4 | 2212 | |
df578e7d | 2213 | while (optind < argc) |
1da177e4 | 2214 | read_symbols(argv[optind++]); |
1da177e4 | 2215 | |
712f9b46 RR |
2216 | if (files_source) |
2217 | read_symbols_from_files(files_source); | |
2218 | ||
b817f6fe SR |
2219 | for (mod = modules; mod; mod = mod->next) { |
2220 | if (mod->skip) | |
2221 | continue; | |
c96fca21 | 2222 | check_exports(mod); |
b817f6fe SR |
2223 | } |
2224 | ||
c53ddacd KK |
2225 | err = 0; |
2226 | ||
1da177e4 | 2227 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2228 | char fname[strlen(mod->name) + 10]; |
2229 | ||
1da177e4 LT |
2230 | if (mod->skip) |
2231 | continue; | |
2232 | ||
2233 | buf.pos = 0; | |
2234 | ||
2235 | add_header(&buf, mod); | |
2449b8ba | 2236 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2237 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2238 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2239 | add_depends(&buf, mod, modules); |
2240 | add_moddevtable(&buf, mod); | |
2241 | add_srcversion(&buf, mod); | |
2242 | ||
2243 | sprintf(fname, "%s.mod.c", mod->name); | |
2244 | write_if_changed(&buf, fname); | |
2245 | } | |
2246 | ||
2247 | if (dump_write) | |
2248 | write_dump(dump_write); | |
588ccd73 | 2249 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2250 | warn("modpost: Found %d section mismatch(es).\n" |
2251 | "To see full details build your kernel with:\n" | |
2252 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2253 | sec_mismatch_count); | |
1da177e4 | 2254 | |
c53ddacd | 2255 | return err; |
1da177e4 | 2256 | } |