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Merge commit 'v2.6.30.9' into mini2440-stable-v2.6.30
[linux-2.6/mini2440.git] / scripts / mod / modpost.c
blob161b7846733e5ee5988ef42d5bf114cd8f0eef4d
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
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
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <ctype.h>
17 #include "modpost.h"
18 #include "../../include/linux/license.h"
19
20 /* Are we using CONFIG_MODVERSIONS? */
21 int modversions = 0;
22 /* Warn about undefined symbols? (do so if we have vmlinux) */
23 int have_vmlinux = 0;
24 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
25 static int all_versions = 0;
26 /* If we are modposting external module set to 1 */
27 static int external_module = 0;
28 /* Warn about section mismatch in vmlinux if set to 1 */
29 static int vmlinux_section_warnings = 1;
30 /* Only warn about unresolved symbols */
31 static int warn_unresolved = 0;
32 /* How a symbol is exported */
33 static int sec_mismatch_count = 0;
34 static int sec_mismatch_verbose = 1;
35
36 enum export {
37 export_plain, export_unused, export_gpl,
38 export_unused_gpl, export_gpl_future, export_unknown
39 };
40
41 #define PRINTF __attribute__ ((format (printf, 1, 2)))
42
43 PRINTF void fatal(const char *fmt, ...)
44 {
45 va_list arglist;
46
47 fprintf(stderr, "FATAL: ");
48
49 va_start(arglist, fmt);
50 vfprintf(stderr, fmt, arglist);
51 va_end(arglist);
52
53 exit(1);
54 }
55
56 PRINTF void warn(const char *fmt, ...)
57 {
58 va_list arglist;
59
60 fprintf(stderr, "WARNING: ");
61
62 va_start(arglist, fmt);
63 vfprintf(stderr, fmt, arglist);
64 va_end(arglist);
65 }
66
67 PRINTF void merror(const char *fmt, ...)
68 {
69 va_list arglist;
70
71 fprintf(stderr, "ERROR: ");
72
73 va_start(arglist, fmt);
74 vfprintf(stderr, fmt, arglist);
75 va_end(arglist);
76 }
77
78 static int is_vmlinux(const char *modname)
79 {
80 const char *myname;
81
82 myname = strrchr(modname, '/');
83 if (myname)
84 myname++;
85 else
86 myname = modname;
87
88 return (strcmp(myname, "vmlinux") == 0) ||
89 (strcmp(myname, "vmlinux.o") == 0);
90 }
91
92 void *do_nofail(void *ptr, const char *expr)
93 {
94 if (!ptr)
95 fatal("modpost: Memory allocation failure: %s.\n", expr);
96
97 return ptr;
98 }
99
100 /* A list of all modules we processed */
101 static struct module *modules;
102
103 static struct module *find_module(char *modname)
104 {
105 struct module *mod;
106
107 for (mod = modules; mod; mod = mod->next)
108 if (strcmp(mod->name, modname) == 0)
109 break;
110 return mod;
111 }
112
113 static struct module *new_module(char *modname)
114 {
115 struct module *mod;
116 char *p, *s;
117
118 mod = NOFAIL(malloc(sizeof(*mod)));
119 memset(mod, 0, sizeof(*mod));
120 p = NOFAIL(strdup(modname));
121
122 /* strip trailing .o */
123 s = strrchr(p, '.');
124 if (s != NULL)
125 if (strcmp(s, ".o") == 0)
126 *s = '\0';
127
128 /* add to list */
129 mod->name = p;
130 mod->gpl_compatible = -1;
131 mod->next = modules;
132 modules = mod;
133
134 return mod;
135 }
136
137 /* A hash of all exported symbols,
138 * struct symbol is also used for lists of unresolved symbols */
139
140 #define SYMBOL_HASH_SIZE 1024
141
142 struct symbol {
143 struct symbol *next;
144 struct module *module;
145 unsigned int crc;
146 int crc_valid;
147 unsigned int weak:1;
148 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
149 unsigned int kernel:1; /* 1 if symbol is from kernel
150 * (only for external modules) **/
151 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
152 enum export export; /* Type of export */
153 char name[0];
154 };
155
156 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
157
158 /* This is based on the hash agorithm from gdbm, via tdb */
159 static inline unsigned int tdb_hash(const char *name)
160 {
161 unsigned value; /* Used to compute the hash value. */
162 unsigned i; /* Used to cycle through random values. */
163
164 /* Set the initial value from the key size. */
165 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
166 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
167
168 return (1103515243 * value + 12345);
169 }
170
171 /**
172 * Allocate a new symbols for use in the hash of exported symbols or
173 * the list of unresolved symbols per module
174 **/
175 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
176 struct symbol *next)
177 {
178 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
179
180 memset(s, 0, sizeof(*s));
181 strcpy(s->name, name);
182 s->weak = weak;
183 s->next = next;
184 return s;
185 }
186
187 /* For the hash of exported symbols */
188 static struct symbol *new_symbol(const char *name, struct module *module,
189 enum export export)
190 {
191 unsigned int hash;
192 struct symbol *new;
193
194 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
195 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
196 new->module = module;
197 new->export = export;
198 return new;
199 }
200
201 static struct symbol *find_symbol(const char *name)
202 {
203 struct symbol *s;
204
205 /* For our purposes, .foo matches foo. PPC64 needs this. */
206 if (name[0] == '.')
207 name++;
208
209 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
210 if (strcmp(s->name, name) == 0)
211 return s;
212 }
213 return NULL;
214 }
215
216 static struct {
217 const char *str;
218 enum export export;
219 } export_list[] = {
220 { .str = "EXPORT_SYMBOL", .export = export_plain },
221 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
222 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
223 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
224 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
225 { .str = "(unknown)", .export = export_unknown },
226 };
227
228
229 static const char *export_str(enum export ex)
230 {
231 return export_list[ex].str;
232 }
233
234 static enum export export_no(const char *s)
235 {
236 int i;
237
238 if (!s)
239 return export_unknown;
240 for (i = 0; export_list[i].export != export_unknown; i++) {
241 if (strcmp(export_list[i].str, s) == 0)
242 return export_list[i].export;
243 }
244 return export_unknown;
245 }
246
247 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
248 {
249 if (sec == elf->export_sec)
250 return export_plain;
251 else if (sec == elf->export_unused_sec)
252 return export_unused;
253 else if (sec == elf->export_gpl_sec)
254 return export_gpl;
255 else if (sec == elf->export_unused_gpl_sec)
256 return export_unused_gpl;
257 else if (sec == elf->export_gpl_future_sec)
258 return export_gpl_future;
259 else
260 return export_unknown;
261 }
262
263 /**
264 * Add an exported symbol - it may have already been added without a
265 * CRC, in this case just update the CRC
266 **/
267 static struct symbol *sym_add_exported(const char *name, struct module *mod,
268 enum export export)
269 {
270 struct symbol *s = find_symbol(name);
271
272 if (!s) {
273 s = new_symbol(name, mod, export);
274 } else {
275 if (!s->preloaded) {
276 warn("%s: '%s' exported twice. Previous export "
277 "was in %s%s\n", mod->name, name,
278 s->module->name,
279 is_vmlinux(s->module->name) ?"":".ko");
280 } else {
281 /* In case Modules.symvers was out of date */
282 s->module = mod;
283 }
284 }
285 s->preloaded = 0;
286 s->vmlinux = is_vmlinux(mod->name);
287 s->kernel = 0;
288 s->export = export;
289 return s;
290 }
291
292 static void sym_update_crc(const char *name, struct module *mod,
293 unsigned int crc, enum export export)
294 {
295 struct symbol *s = find_symbol(name);
296
297 if (!s)
298 s = new_symbol(name, mod, export);
299 s->crc = crc;
300 s->crc_valid = 1;
301 }
302
303 void *grab_file(const char *filename, unsigned long *size)
304 {
305 struct stat st;
306 void *map;
307 int fd;
308
309 fd = open(filename, O_RDONLY);
310 if (fd < 0 || fstat(fd, &st) != 0)
311 return NULL;
312
313 *size = st.st_size;
314 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
315 close(fd);
316
317 if (map == MAP_FAILED)
318 return NULL;
319 return map;
320 }
321
322 /**
323 * Return a copy of the next line in a mmap'ed file.
324 * spaces in the beginning of the line is trimmed away.
325 * Return a pointer to a static buffer.
326 **/
327 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
328 {
329 static char line[4096];
330 int skip = 1;
331 size_t len = 0;
332 signed char *p = (signed char *)file + *pos;
333 char *s = line;
334
335 for (; *pos < size ; (*pos)++) {
336 if (skip && isspace(*p)) {
337 p++;
338 continue;
339 }
340 skip = 0;
341 if (*p != '\n' && (*pos < size)) {
342 len++;
343 *s++ = *p++;
344 if (len > 4095)
345 break; /* Too long, stop */
346 } else {
347 /* End of string */
348 *s = '\0';
349 return line;
350 }
351 }
352 /* End of buffer */
353 return NULL;
354 }
355
356 void release_file(void *file, unsigned long size)
357 {
358 munmap(file, size);
359 }
360
361 static int parse_elf(struct elf_info *info, const char *filename)
362 {
363 unsigned int i;
364 Elf_Ehdr *hdr;
365 Elf_Shdr *sechdrs;
366 Elf_Sym *sym;
367
368 hdr = grab_file(filename, &info->size);
369 if (!hdr) {
370 perror(filename);
371 exit(1);
372 }
373 info->hdr = hdr;
374 if (info->size < sizeof(*hdr)) {
375 /* file too small, assume this is an empty .o file */
376 return 0;
377 }
378 /* Is this a valid ELF file? */
379 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
380 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
381 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
382 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
383 /* Not an ELF file - silently ignore it */
384 return 0;
385 }
386 /* Fix endianness in ELF header */
387 hdr->e_type = TO_NATIVE(hdr->e_type);
388 hdr->e_machine = TO_NATIVE(hdr->e_machine);
389 hdr->e_version = TO_NATIVE(hdr->e_version);
390 hdr->e_entry = TO_NATIVE(hdr->e_entry);
391 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
392 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
393 hdr->e_flags = TO_NATIVE(hdr->e_flags);
394 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
395 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
396 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
397 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
398 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
399 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
400 sechdrs = (void *)hdr + hdr->e_shoff;
401 info->sechdrs = sechdrs;
402
403 /* Check if file offset is correct */
404 if (hdr->e_shoff > info->size) {
405 fatal("section header offset=%lu in file '%s' is bigger than "
406 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
407 filename, info->size);
408 return 0;
409 }
410
411 /* Fix endianness in section headers */
412 for (i = 0; i < hdr->e_shnum; i++) {
413 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
414 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
415 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
416 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
417 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
418 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
419 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
420 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
421 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
422 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
423 }
424 /* Find symbol table. */
425 for (i = 1; i < hdr->e_shnum; i++) {
426 const char *secstrings
427 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
428 const char *secname;
429 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
430
431 if (!nobits && sechdrs[i].sh_offset > info->size) {
432 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
433 "sizeof(*hrd)=%zu\n", filename,
434 (unsigned long)sechdrs[i].sh_offset,
435 sizeof(*hdr));
436 return 0;
437 }
438 secname = secstrings + sechdrs[i].sh_name;
439 if (strcmp(secname, ".modinfo") == 0) {
440 if (nobits)
441 fatal("%s has NOBITS .modinfo\n", filename);
442 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
443 info->modinfo_len = sechdrs[i].sh_size;
444 } else if (strcmp(secname, "__ksymtab") == 0)
445 info->export_sec = i;
446 else if (strcmp(secname, "__ksymtab_unused") == 0)
447 info->export_unused_sec = i;
448 else if (strcmp(secname, "__ksymtab_gpl") == 0)
449 info->export_gpl_sec = i;
450 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
451 info->export_unused_gpl_sec = i;
452 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
453 info->export_gpl_future_sec = i;
454 else if (strcmp(secname, "__markers_strings") == 0)
455 info->markers_strings_sec = i;
456
457 if (sechdrs[i].sh_type != SHT_SYMTAB)
458 continue;
459
460 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
461 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
462 + sechdrs[i].sh_size;
463 info->strtab = (void *)hdr +
464 sechdrs[sechdrs[i].sh_link].sh_offset;
465 }
466 if (!info->symtab_start)
467 fatal("%s has no symtab?\n", filename);
468
469 /* Fix endianness in symbols */
470 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
471 sym->st_shndx = TO_NATIVE(sym->st_shndx);
472 sym->st_name = TO_NATIVE(sym->st_name);
473 sym->st_value = TO_NATIVE(sym->st_value);
474 sym->st_size = TO_NATIVE(sym->st_size);
475 }
476 return 1;
477 }
478
479 static void parse_elf_finish(struct elf_info *info)
480 {
481 release_file(info->hdr, info->size);
482 }
483
484 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
485 {
486 /* ignore __this_module, it will be resolved shortly */
487 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
488 return 1;
489 /* ignore global offset table */
490 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
491 return 1;
492 if (info->hdr->e_machine == EM_PPC)
493 /* Special register function linked on all modules during final link of .ko */
494 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
495 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
496 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
497 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
498 return 1;
499 /* Do not ignore this symbol */
500 return 0;
501 }
502
503 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
504 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
505
506 static void handle_modversions(struct module *mod, struct elf_info *info,
507 Elf_Sym *sym, const char *symname)
508 {
509 unsigned int crc;
510 enum export export = export_from_sec(info, sym->st_shndx);
511
512 switch (sym->st_shndx) {
513 case SHN_COMMON:
514 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
515 break;
516 case SHN_ABS:
517 /* CRC'd symbol */
518 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
519 crc = (unsigned int) sym->st_value;
520 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
521 export);
522 }
523 break;
524 case SHN_UNDEF:
525 /* undefined symbol */
526 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
527 ELF_ST_BIND(sym->st_info) != STB_WEAK)
528 break;
529 if (ignore_undef_symbol(info, symname))
530 break;
531 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
532 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
533 /* add compatibility with older glibc */
534 #ifndef STT_SPARC_REGISTER
535 #define STT_SPARC_REGISTER STT_REGISTER
536 #endif
537 if (info->hdr->e_machine == EM_SPARC ||
538 info->hdr->e_machine == EM_SPARCV9) {
539 /* Ignore register directives. */
540 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
541 break;
542 if (symname[0] == '.') {
543 char *munged = strdup(symname);
544 munged[0] = '_';
545 munged[1] = toupper(munged[1]);
546 symname = munged;
547 }
548 }
549 #endif
550
551 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
552 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
553 mod->unres =
554 alloc_symbol(symname +
555 strlen(MODULE_SYMBOL_PREFIX),
556 ELF_ST_BIND(sym->st_info) == STB_WEAK,
557 mod->unres);
558 }
559 break;
560 default:
561 /* All exported symbols */
562 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
563 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
564 export);
565 }
566 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
567 mod->has_init = 1;
568 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
569 mod->has_cleanup = 1;
570 break;
571 }
572 }
573
574 /**
575 * Parse tag=value strings from .modinfo section
576 **/
577 static char *next_string(char *string, unsigned long *secsize)
578 {
579 /* Skip non-zero chars */
580 while (string[0]) {
581 string++;
582 if ((*secsize)-- <= 1)
583 return NULL;
584 }
585
586 /* Skip any zero padding. */
587 while (!string[0]) {
588 string++;
589 if ((*secsize)-- <= 1)
590 return NULL;
591 }
592 return string;
593 }
594
595 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
596 const char *tag, char *info)
597 {
598 char *p;
599 unsigned int taglen = strlen(tag);
600 unsigned long size = modinfo_len;
601
602 if (info) {
603 size -= info - (char *)modinfo;
604 modinfo = next_string(info, &size);
605 }
606
607 for (p = modinfo; p; p = next_string(p, &size)) {
608 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
609 return p + taglen + 1;
610 }
611 return NULL;
612 }
613
614 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
615 const char *tag)
616
617 {
618 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
619 }
620
621 /**
622 * Test if string s ends in string sub
623 * return 0 if match
624 **/
625 static int strrcmp(const char *s, const char *sub)
626 {
627 int slen, sublen;
628
629 if (!s || !sub)
630 return 1;
631
632 slen = strlen(s);
633 sublen = strlen(sub);
634
635 if ((slen == 0) || (sublen == 0))
636 return 1;
637
638 if (sublen > slen)
639 return 1;
640
641 return memcmp(s + slen - sublen, sub, sublen);
642 }
643
644 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
645 {
646 if (sym)
647 return elf->strtab + sym->st_name;
648 else
649 return "(unknown)";
650 }
651
652 static const char *sec_name(struct elf_info *elf, int shndx)
653 {
654 Elf_Shdr *sechdrs = elf->sechdrs;
655 return (void *)elf->hdr +
656 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
657 sechdrs[shndx].sh_name;
658 }
659
660 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
661 {
662 return (void *)elf->hdr +
663 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
664 sechdr->sh_name;
665 }
666
667 /* if sym is empty or point to a string
668 * like ".[0-9]+" then return 1.
669 * This is the optional prefix added by ld to some sections
670 */
671 static int number_prefix(const char *sym)
672 {
673 if (*sym++ == '\0')
674 return 1;
675 if (*sym != '.')
676 return 0;
677 do {
678 char c = *sym++;
679 if (c < '0' || c > '9')
680 return 0;
681 } while (*sym);
682 return 1;
683 }
684
685 /* The pattern is an array of simple patterns.
686 * "foo" will match an exact string equal to "foo"
687 * "*foo" will match a string that ends with "foo"
688 * "foo*" will match a string that begins with "foo"
689 * "foo$" will match a string equal to "foo" or "foo.1"
690 * where the '1' can be any number including several digits.
691 * The $ syntax is for sections where ld append a dot number
692 * to make section name unique.
693 */
694 int match(const char *sym, const char * const pat[])
695 {
696 const char *p;
697 while (*pat) {
698 p = *pat++;
699 const char *endp = p + strlen(p) - 1;
700
701 /* "*foo" */
702 if (*p == '*') {
703 if (strrcmp(sym, p + 1) == 0)
704 return 1;
705 }
706 /* "foo*" */
707 else if (*endp == '*') {
708 if (strncmp(sym, p, strlen(p) - 1) == 0)
709 return 1;
710 }
711 /* "foo$" */
712 else if (*endp == '$') {
713 if (strncmp(sym, p, strlen(p) - 1) == 0) {
714 if (number_prefix(sym + strlen(p) - 1))
715 return 1;
716 }
717 }
718 /* no wildcards */
719 else {
720 if (strcmp(p, sym) == 0)
721 return 1;
722 }
723 }
724 /* no match */
725 return 0;
726 }
727
728 /* sections that we do not want to do full section mismatch check on */
729 static const char *section_white_list[] =
730 {
731 ".comment*",
732 ".debug*",
733 ".mdebug*", /* alpha, score, mips etc. */
734 ".pdr", /* alpha, score, mips etc. */
735 ".stab*",
736 ".note*",
737 ".got*",
738 ".toc*",
739 NULL
740 };
741
742 /*
743 * This is used to find sections missing the SHF_ALLOC flag.
744 * The cause of this is often a section specified in assembler
745 * without "ax" / "aw".
746 */
747 static void check_section(const char *modname, struct elf_info *elf,
748 Elf_Shdr *sechdr)
749 {
750 const char *sec = sech_name(elf, sechdr);
751
752 if (sechdr->sh_type == SHT_PROGBITS &&
753 !(sechdr->sh_flags & SHF_ALLOC) &&
754 !match(sec, section_white_list)) {
755 warn("%s (%s): unexpected non-allocatable section.\n"
756 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
757 "Note that for example <linux/init.h> contains\n"
758 "section definitions for use in .S files.\n\n",
759 modname, sec);
760 }
761 }
762
763
764
765 #define ALL_INIT_DATA_SECTIONS \
766 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
767 #define ALL_EXIT_DATA_SECTIONS \
768 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
769
770 #define ALL_INIT_TEXT_SECTIONS \
771 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
772 #define ALL_EXIT_TEXT_SECTIONS \
773 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
774
775 #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS
776 #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS
777
778 #define DATA_SECTIONS ".data$", ".data.rel$"
779 #define TEXT_SECTIONS ".text$"
780
781 #define INIT_SECTIONS ".init.data$", ".init.text$"
782 #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$"
783 #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$"
784 #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$"
785
786 #define EXIT_SECTIONS ".exit.data$", ".exit.text$"
787 #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$"
788 #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$"
789 #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$"
790
791 /* init data sections */
792 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
793
794 /* all init sections */
795 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
796
797 /* All init and exit sections (code + data) */
798 static const char *init_exit_sections[] =
799 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
800
801 /* data section */
802 static const char *data_sections[] = { DATA_SECTIONS, NULL };
803
804
805 /* symbols in .data that may refer to init/exit sections */
806 static const char *symbol_white_list[] =
807 {
808 "*driver",
809 "*_template", /* scsi uses *_template a lot */
810 "*_timer", /* arm uses ops structures named _timer a lot */
811 "*_sht", /* scsi also used *_sht to some extent */
812 "*_ops",
813 "*_probe",
814 "*_probe_one",
815 "*_console",
816 NULL
817 };
818
819 static const char *head_sections[] = { ".head.text*", NULL };
820 static const char *linker_symbols[] =
821 { "__init_begin", "_sinittext", "_einittext", NULL };
822
823 enum mismatch {
824 NO_MISMATCH,
825 TEXT_TO_INIT,
826 DATA_TO_INIT,
827 TEXT_TO_EXIT,
828 DATA_TO_EXIT,
829 XXXINIT_TO_INIT,
830 XXXEXIT_TO_EXIT,
831 INIT_TO_EXIT,
832 EXIT_TO_INIT,
833 EXPORT_TO_INIT_EXIT,
834 };
835
836 struct sectioncheck {
837 const char *fromsec[20];
838 const char *tosec[20];
839 enum mismatch mismatch;
840 };
841
842 const struct sectioncheck sectioncheck[] = {
843 /* Do not reference init/exit code/data from
844 * normal code and data
845 */
846 {
847 .fromsec = { TEXT_SECTIONS, NULL },
848 .tosec = { ALL_INIT_SECTIONS, NULL },
849 .mismatch = TEXT_TO_INIT,
850 },
851 {
852 .fromsec = { DATA_SECTIONS, NULL },
853 .tosec = { ALL_INIT_SECTIONS, NULL },
854 .mismatch = DATA_TO_INIT,
855 },
856 {
857 .fromsec = { TEXT_SECTIONS, NULL },
858 .tosec = { ALL_EXIT_SECTIONS, NULL },
859 .mismatch = TEXT_TO_EXIT,
860 },
861 {
862 .fromsec = { DATA_SECTIONS, NULL },
863 .tosec = { ALL_EXIT_SECTIONS, NULL },
864 .mismatch = DATA_TO_EXIT,
865 },
866 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
867 {
868 .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL },
869 .tosec = { INIT_SECTIONS, NULL },
870 .mismatch = XXXINIT_TO_INIT,
871 },
872 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
873 {
874 .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
875 .tosec = { EXIT_SECTIONS, NULL },
876 .mismatch = XXXEXIT_TO_EXIT,
877 },
878 /* Do not use exit code/data from init code */
879 {
880 .fromsec = { ALL_INIT_SECTIONS, NULL },
881 .tosec = { ALL_EXIT_SECTIONS, NULL },
882 .mismatch = INIT_TO_EXIT,
883 },
884 /* Do not use init code/data from exit code */
885 {
886 .fromsec = { ALL_EXIT_SECTIONS, NULL },
887 .tosec = { ALL_INIT_SECTIONS, NULL },
888 .mismatch = EXIT_TO_INIT,
889 },
890 /* Do not export init/exit functions or data */
891 {
892 .fromsec = { "__ksymtab*", NULL },
893 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
894 .mismatch = EXPORT_TO_INIT_EXIT
895 }
896 };
897
898 static int section_mismatch(const char *fromsec, const char *tosec)
899 {
900 int i;
901 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
902 const struct sectioncheck *check = &sectioncheck[0];
903
904 for (i = 0; i < elems; i++) {
905 if (match(fromsec, check->fromsec) &&
906 match(tosec, check->tosec))
907 return check->mismatch;
908 check++;
909 }
910 return NO_MISMATCH;
911 }
912
913 /**
914 * Whitelist to allow certain references to pass with no warning.
915 *
916 * Pattern 1:
917 * If a module parameter is declared __initdata and permissions=0
918 * then this is legal despite the warning generated.
919 * We cannot see value of permissions here, so just ignore
920 * this pattern.
921 * The pattern is identified by:
922 * tosec = .init.data
923 * fromsec = .data*
924 * atsym =__param*
925 *
926 * Pattern 2:
927 * Many drivers utilise a *driver container with references to
928 * add, remove, probe functions etc.
929 * These functions may often be marked __init and we do not want to
930 * warn here.
931 * the pattern is identified by:
932 * tosec = init or exit section
933 * fromsec = data section
934 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
935 * *probe_one, *_console, *_timer
936 *
937 * Pattern 3:
938 * Whitelist all references from .head.text to any init section
939 *
940 * Pattern 4:
941 * Some symbols belong to init section but still it is ok to reference
942 * these from non-init sections as these symbols don't have any memory
943 * allocated for them and symbol address and value are same. So even
944 * if init section is freed, its ok to reference those symbols.
945 * For ex. symbols marking the init section boundaries.
946 * This pattern is identified by
947 * refsymname = __init_begin, _sinittext, _einittext
948 *
949 **/
950 static int secref_whitelist(const char *fromsec, const char *fromsym,
951 const char *tosec, const char *tosym)
952 {
953 /* Check for pattern 1 */
954 if (match(tosec, init_data_sections) &&
955 match(fromsec, data_sections) &&
956 (strncmp(fromsym, "__param", strlen("__param")) == 0))
957 return 0;
958
959 /* Check for pattern 2 */
960 if (match(tosec, init_exit_sections) &&
961 match(fromsec, data_sections) &&
962 match(fromsym, symbol_white_list))
963 return 0;
964
965 /* Check for pattern 3 */
966 if (match(fromsec, head_sections) &&
967 match(tosec, init_sections))
968 return 0;
969
970 /* Check for pattern 4 */
971 if (match(tosym, linker_symbols))
972 return 0;
973
974 return 1;
975 }
976
977 /**
978 * Find symbol based on relocation record info.
979 * In some cases the symbol supplied is a valid symbol so
980 * return refsym. If st_name != 0 we assume this is a valid symbol.
981 * In other cases the symbol needs to be looked up in the symbol table
982 * based on section and address.
983 * **/
984 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
985 Elf_Sym *relsym)
986 {
987 Elf_Sym *sym;
988 Elf_Sym *near = NULL;
989 Elf64_Sword distance = 20;
990 Elf64_Sword d;
991
992 if (relsym->st_name != 0)
993 return relsym;
994 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
995 if (sym->st_shndx != relsym->st_shndx)
996 continue;
997 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
998 continue;
999 if (sym->st_value == addr)
1000 return sym;
1001 /* Find a symbol nearby - addr are maybe negative */
1002 d = sym->st_value - addr;
1003 if (d < 0)
1004 d = addr - sym->st_value;
1005 if (d < distance) {
1006 distance = d;
1007 near = sym;
1008 }
1009 }
1010 /* We need a close match */
1011 if (distance < 20)
1012 return near;
1013 else
1014 return NULL;
1015 }
1016
1017 static inline int is_arm_mapping_symbol(const char *str)
1018 {
1019 return str[0] == '$' && strchr("atd", str[1])
1020 && (str[2] == '\0' || str[2] == '.');
1021 }
1022
1023 /*
1024 * If there's no name there, ignore it; likewise, ignore it if it's
1025 * one of the magic symbols emitted used by current ARM tools.
1026 *
1027 * Otherwise if find_symbols_between() returns those symbols, they'll
1028 * fail the whitelist tests and cause lots of false alarms ... fixable
1029 * only by merging __exit and __init sections into __text, bloating
1030 * the kernel (which is especially evil on embedded platforms).
1031 */
1032 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1033 {
1034 const char *name = elf->strtab + sym->st_name;
1035
1036 if (!name || !strlen(name))
1037 return 0;
1038 return !is_arm_mapping_symbol(name);
1039 }
1040
1041 /*
1042 * Find symbols before or equal addr and after addr - in the section sec.
1043 * If we find two symbols with equal offset prefer one with a valid name.
1044 * The ELF format may have a better way to detect what type of symbol
1045 * it is, but this works for now.
1046 **/
1047 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1048 const char *sec)
1049 {
1050 Elf_Sym *sym;
1051 Elf_Sym *near = NULL;
1052 Elf_Addr distance = ~0;
1053
1054 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1055 const char *symsec;
1056
1057 if (sym->st_shndx >= SHN_LORESERVE)
1058 continue;
1059 symsec = sec_name(elf, sym->st_shndx);
1060 if (strcmp(symsec, sec) != 0)
1061 continue;
1062 if (!is_valid_name(elf, sym))
1063 continue;
1064 if (sym->st_value <= addr) {
1065 if ((addr - sym->st_value) < distance) {
1066 distance = addr - sym->st_value;
1067 near = sym;
1068 } else if ((addr - sym->st_value) == distance) {
1069 near = sym;
1070 }
1071 }
1072 }
1073 return near;
1074 }
1075
1076 /*
1077 * Convert a section name to the function/data attribute
1078 * .init.text => __init
1079 * .cpuinit.data => __cpudata
1080 * .memexitconst => __memconst
1081 * etc.
1082 */
1083 static char *sec2annotation(const char *s)
1084 {
1085 if (match(s, init_exit_sections)) {
1086 char *p = malloc(20);
1087 char *r = p;
1088
1089 *p++ = '_';
1090 *p++ = '_';
1091 if (*s == '.')
1092 s++;
1093 while (*s && *s != '.')
1094 *p++ = *s++;
1095 *p = '\0';
1096 if (*s == '.')
1097 s++;
1098 if (strstr(s, "rodata") != NULL)
1099 strcat(p, "const ");
1100 else if (strstr(s, "data") != NULL)
1101 strcat(p, "data ");
1102 else
1103 strcat(p, " ");
1104 return r; /* we leak her but we do not care */
1105 } else {
1106 return "";
1107 }
1108 }
1109
1110 static int is_function(Elf_Sym *sym)
1111 {
1112 if (sym)
1113 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1114 else
1115 return -1;
1116 }
1117
1118 /*
1119 * Print a warning about a section mismatch.
1120 * Try to find symbols near it so user can find it.
1121 * Check whitelist before warning - it may be a false positive.
1122 */
1123 static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
1124 const char *fromsec,
1125 unsigned long long fromaddr,
1126 const char *fromsym,
1127 int from_is_func,
1128 const char *tosec, const char *tosym,
1129 int to_is_func)
1130 {
1131 const char *from, *from_p;
1132 const char *to, *to_p;
1133
1134 switch (from_is_func) {
1135 case 0: from = "variable"; from_p = ""; break;
1136 case 1: from = "function"; from_p = "()"; break;
1137 default: from = "(unknown reference)"; from_p = ""; break;
1138 }
1139 switch (to_is_func) {
1140 case 0: to = "variable"; to_p = ""; break;
1141 case 1: to = "function"; to_p = "()"; break;
1142 default: to = "(unknown reference)"; to_p = ""; break;
1143 }
1144
1145 sec_mismatch_count++;
1146 if (!sec_mismatch_verbose)
1147 return;
1148
1149 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1150 "to the %s %s:%s%s\n",
1151 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1152 tosym, to_p);
1153
1154 switch (mismatch) {
1155 case TEXT_TO_INIT:
1156 fprintf(stderr,
1157 "The function %s%s() references\n"
1158 "the %s %s%s%s.\n"
1159 "This is often because %s lacks a %s\n"
1160 "annotation or the annotation of %s is wrong.\n",
1161 sec2annotation(fromsec), fromsym,
1162 to, sec2annotation(tosec), tosym, to_p,
1163 fromsym, sec2annotation(tosec), tosym);
1164 break;
1165 case DATA_TO_INIT: {
1166 const char **s = symbol_white_list;
1167 fprintf(stderr,
1168 "The variable %s references\n"
1169 "the %s %s%s%s\n"
1170 "If the reference is valid then annotate the\n"
1171 "variable with __init* (see linux/init.h) "
1172 "or name the variable:\n",
1173 fromsym, to, sec2annotation(tosec), tosym, to_p);
1174 while (*s)
1175 fprintf(stderr, "%s, ", *s++);
1176 fprintf(stderr, "\n");
1177 break;
1178 }
1179 case TEXT_TO_EXIT:
1180 fprintf(stderr,
1181 "The function %s() references a %s in an exit section.\n"
1182 "Often the %s %s%s has valid usage outside the exit section\n"
1183 "and the fix is to remove the %sannotation of %s.\n",
1184 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
1185 break;
1186 case DATA_TO_EXIT: {
1187 const char **s = symbol_white_list;
1188 fprintf(stderr,
1189 "The variable %s references\n"
1190 "the %s %s%s%s\n"
1191 "If the reference is valid then annotate the\n"
1192 "variable with __exit* (see linux/init.h) or "
1193 "name the variable:\n",
1194 fromsym, to, sec2annotation(tosec), tosym, to_p);
1195 while (*s)
1196 fprintf(stderr, "%s, ", *s++);
1197 fprintf(stderr, "\n");
1198 break;
1199 }
1200 case XXXINIT_TO_INIT:
1201 case XXXEXIT_TO_EXIT:
1202 fprintf(stderr,
1203 "The %s %s%s%s references\n"
1204 "a %s %s%s%s.\n"
1205 "If %s is only used by %s then\n"
1206 "annotate %s with a matching annotation.\n",
1207 from, sec2annotation(fromsec), fromsym, from_p,
1208 to, sec2annotation(tosec), tosym, to_p,
1209 tosym, fromsym, tosym);
1210 break;
1211 case INIT_TO_EXIT:
1212 fprintf(stderr,
1213 "The %s %s%s%s references\n"
1214 "a %s %s%s%s.\n"
1215 "This is often seen when error handling "
1216 "in the init function\n"
1217 "uses functionality in the exit path.\n"
1218 "The fix is often to remove the %sannotation of\n"
1219 "%s%s so it may be used outside an exit section.\n",
1220 from, sec2annotation(fromsec), fromsym, from_p,
1221 to, sec2annotation(tosec), tosym, to_p,
1222 sec2annotation(tosec), tosym, to_p);
1223 break;
1224 case EXIT_TO_INIT:
1225 fprintf(stderr,
1226 "The %s %s%s%s references\n"
1227 "a %s %s%s%s.\n"
1228 "This is often seen when error handling "
1229 "in the exit function\n"
1230 "uses functionality in the init path.\n"
1231 "The fix is often to remove the %sannotation of\n"
1232 "%s%s so it may be used outside an init section.\n",
1233 from, sec2annotation(fromsec), fromsym, from_p,
1234 to, sec2annotation(tosec), tosym, to_p,
1235 sec2annotation(tosec), tosym, to_p);
1236 break;
1237 case EXPORT_TO_INIT_EXIT:
1238 fprintf(stderr,
1239 "The symbol %s is exported and annotated %s\n"
1240 "Fix this by removing the %sannotation of %s "
1241 "or drop the export.\n",
1242 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
1243 case NO_MISMATCH:
1244 /* To get warnings on missing members */
1245 break;
1246 }
1247 fprintf(stderr, "\n");
1248 }
1249
1250 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1251 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1252 {
1253 const char *tosec;
1254 enum mismatch mismatch;
1255
1256 tosec = sec_name(elf, sym->st_shndx);
1257 mismatch = section_mismatch(fromsec, tosec);
1258 if (mismatch != NO_MISMATCH) {
1259 Elf_Sym *to;
1260 Elf_Sym *from;
1261 const char *tosym;
1262 const char *fromsym;
1263
1264 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1265 fromsym = sym_name(elf, from);
1266 to = find_elf_symbol(elf, r->r_addend, sym);
1267 tosym = sym_name(elf, to);
1268
1269 /* check whitelist - we may ignore it */
1270 if (secref_whitelist(fromsec, fromsym, tosec, tosym)) {
1271 report_sec_mismatch(modname, mismatch,
1272 fromsec, r->r_offset, fromsym,
1273 is_function(from), tosec, tosym,
1274 is_function(to));
1275 }
1276 }
1277 }
1278
1279 static unsigned int *reloc_location(struct elf_info *elf,
1280 Elf_Shdr *sechdr, Elf_Rela *r)
1281 {
1282 Elf_Shdr *sechdrs = elf->sechdrs;
1283 int section = sechdr->sh_info;
1284
1285 return (void *)elf->hdr + sechdrs[section].sh_offset +
1286 (r->r_offset - sechdrs[section].sh_addr);
1287 }
1288
1289 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1290 {
1291 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1292 unsigned int *location = reloc_location(elf, sechdr, r);
1293
1294 switch (r_typ) {
1295 case R_386_32:
1296 r->r_addend = TO_NATIVE(*location);
1297 break;
1298 case R_386_PC32:
1299 r->r_addend = TO_NATIVE(*location) + 4;
1300 /* For CONFIG_RELOCATABLE=y */
1301 if (elf->hdr->e_type == ET_EXEC)
1302 r->r_addend += r->r_offset;
1303 break;
1304 }
1305 return 0;
1306 }
1307
1308 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1309 {
1310 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1311
1312 switch (r_typ) {
1313 case R_ARM_ABS32:
1314 /* From ARM ABI: (S + A) | T */
1315 r->r_addend = (int)(long)
1316 (elf->symtab_start + ELF_R_SYM(r->r_info));
1317 break;
1318 case R_ARM_PC24:
1319 /* From ARM ABI: ((S + A) | T) - P */
1320 r->r_addend = (int)(long)(elf->hdr +
1321 sechdr->sh_offset +
1322 (r->r_offset - sechdr->sh_addr));
1323 break;
1324 default:
1325 return 1;
1326 }
1327 return 0;
1328 }
1329
1330 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1331 {
1332 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1333 unsigned int *location = reloc_location(elf, sechdr, r);
1334 unsigned int inst;
1335
1336 if (r_typ == R_MIPS_HI16)
1337 return 1; /* skip this */
1338 inst = TO_NATIVE(*location);
1339 switch (r_typ) {
1340 case R_MIPS_LO16:
1341 r->r_addend = inst & 0xffff;
1342 break;
1343 case R_MIPS_26:
1344 r->r_addend = (inst & 0x03ffffff) << 2;
1345 break;
1346 case R_MIPS_32:
1347 r->r_addend = inst;
1348 break;
1349 }
1350 return 0;
1351 }
1352
1353 static void section_rela(const char *modname, struct elf_info *elf,
1354 Elf_Shdr *sechdr)
1355 {
1356 Elf_Sym *sym;
1357 Elf_Rela *rela;
1358 Elf_Rela r;
1359 unsigned int r_sym;
1360 const char *fromsec;
1361
1362 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1363 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1364
1365 fromsec = sech_name(elf, sechdr);
1366 fromsec += strlen(".rela");
1367 /* if from section (name) is know good then skip it */
1368 if (match(fromsec, section_white_list))
1369 return;
1370
1371 for (rela = start; rela < stop; rela++) {
1372 r.r_offset = TO_NATIVE(rela->r_offset);
1373 #if KERNEL_ELFCLASS == ELFCLASS64
1374 if (elf->hdr->e_machine == EM_MIPS) {
1375 unsigned int r_typ;
1376 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1377 r_sym = TO_NATIVE(r_sym);
1378 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1379 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1380 } else {
1381 r.r_info = TO_NATIVE(rela->r_info);
1382 r_sym = ELF_R_SYM(r.r_info);
1383 }
1384 #else
1385 r.r_info = TO_NATIVE(rela->r_info);
1386 r_sym = ELF_R_SYM(r.r_info);
1387 #endif
1388 r.r_addend = TO_NATIVE(rela->r_addend);
1389 sym = elf->symtab_start + r_sym;
1390 /* Skip special sections */
1391 if (sym->st_shndx >= SHN_LORESERVE)
1392 continue;
1393 check_section_mismatch(modname, elf, &r, sym, fromsec);
1394 }
1395 }
1396
1397 static void section_rel(const char *modname, struct elf_info *elf,
1398 Elf_Shdr *sechdr)
1399 {
1400 Elf_Sym *sym;
1401 Elf_Rel *rel;
1402 Elf_Rela r;
1403 unsigned int r_sym;
1404 const char *fromsec;
1405
1406 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1407 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1408
1409 fromsec = sech_name(elf, sechdr);
1410 fromsec += strlen(".rel");
1411 /* if from section (name) is know good then skip it */
1412 if (match(fromsec, section_white_list))
1413 return;
1414
1415 for (rel = start; rel < stop; rel++) {
1416 r.r_offset = TO_NATIVE(rel->r_offset);
1417 #if KERNEL_ELFCLASS == ELFCLASS64
1418 if (elf->hdr->e_machine == EM_MIPS) {
1419 unsigned int r_typ;
1420 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1421 r_sym = TO_NATIVE(r_sym);
1422 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1423 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1424 } else {
1425 r.r_info = TO_NATIVE(rel->r_info);
1426 r_sym = ELF_R_SYM(r.r_info);
1427 }
1428 #else
1429 r.r_info = TO_NATIVE(rel->r_info);
1430 r_sym = ELF_R_SYM(r.r_info);
1431 #endif
1432 r.r_addend = 0;
1433 switch (elf->hdr->e_machine) {
1434 case EM_386:
1435 if (addend_386_rel(elf, sechdr, &r))
1436 continue;
1437 break;
1438 case EM_ARM:
1439 if (addend_arm_rel(elf, sechdr, &r))
1440 continue;
1441 break;
1442 case EM_MIPS:
1443 if (addend_mips_rel(elf, sechdr, &r))
1444 continue;
1445 break;
1446 }
1447 sym = elf->symtab_start + r_sym;
1448 /* Skip special sections */
1449 if (sym->st_shndx >= SHN_LORESERVE)
1450 continue;
1451 check_section_mismatch(modname, elf, &r, sym, fromsec);
1452 }
1453 }
1454
1455 /**
1456 * A module includes a number of sections that are discarded
1457 * either when loaded or when used as built-in.
1458 * For loaded modules all functions marked __init and all data
1459 * marked __initdata will be discarded when the module has been intialized.
1460 * Likewise for modules used built-in the sections marked __exit
1461 * are discarded because __exit marked function are supposed to be called
1462 * only when a module is unloaded which never happens for built-in modules.
1463 * The check_sec_ref() function traverses all relocation records
1464 * to find all references to a section that reference a section that will
1465 * be discarded and warns about it.
1466 **/
1467 static void check_sec_ref(struct module *mod, const char *modname,
1468 struct elf_info *elf)
1469 {
1470 int i;
1471 Elf_Shdr *sechdrs = elf->sechdrs;
1472
1473 /* Walk through all sections */
1474 for (i = 0; i < elf->hdr->e_shnum; i++) {
1475 check_section(modname, elf, &elf->sechdrs[i]);
1476 /* We want to process only relocation sections and not .init */
1477 if (sechdrs[i].sh_type == SHT_RELA)
1478 section_rela(modname, elf, &elf->sechdrs[i]);
1479 else if (sechdrs[i].sh_type == SHT_REL)
1480 section_rel(modname, elf, &elf->sechdrs[i]);
1481 }
1482 }
1483
1484 static void get_markers(struct elf_info *info, struct module *mod)
1485 {
1486 const Elf_Shdr *sh = &info->sechdrs[info->markers_strings_sec];
1487 const char *strings = (const char *) info->hdr + sh->sh_offset;
1488 const Elf_Sym *sym, *first_sym, *last_sym;
1489 size_t n;
1490
1491 if (!info->markers_strings_sec)
1492 return;
1493
1494 /*
1495 * First count the strings. We look for all the symbols defined
1496 * in the __markers_strings section named __mstrtab_*. For
1497 * these local names, the compiler puts a random .NNN suffix on,
1498 * so the names don't correspond exactly.
1499 */
1500 first_sym = last_sym = NULL;
1501 n = 0;
1502 for (sym = info->symtab_start; sym < info->symtab_stop; sym++)
1503 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT &&
1504 sym->st_shndx == info->markers_strings_sec &&
1505 !strncmp(info->strtab + sym->st_name,
1506 "__mstrtab_", sizeof "__mstrtab_" - 1)) {
1507 if (first_sym == NULL)
1508 first_sym = sym;
1509 last_sym = sym;
1510 ++n;
1511 }
1512
1513 if (n == 0)
1514 return;
1515
1516 /*
1517 * Now collect each name and format into a line for the output.
1518 * Lines look like:
1519 * marker_name vmlinux marker %s format %d
1520 * The format string after the second \t can use whitespace.
1521 */
1522 mod->markers = NOFAIL(malloc(sizeof mod->markers[0] * n));
1523 mod->nmarkers = n;
1524
1525 n = 0;
1526 for (sym = first_sym; sym <= last_sym; sym++)
1527 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT &&
1528 sym->st_shndx == info->markers_strings_sec &&
1529 !strncmp(info->strtab + sym->st_name,
1530 "__mstrtab_", sizeof "__mstrtab_" - 1)) {
1531 const char *name = strings + sym->st_value;
1532 const char *fmt = strchr(name, '\0') + 1;
1533 char *line = NULL;
1534 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
1535 NOFAIL(line);
1536 mod->markers[n++] = line;
1537 }
1538 }
1539
1540 static void read_symbols(char *modname)
1541 {
1542 const char *symname;
1543 char *version;
1544 char *license;
1545 struct module *mod;
1546 struct elf_info info = { };
1547 Elf_Sym *sym;
1548
1549 if (!parse_elf(&info, modname))
1550 return;
1551
1552 mod = new_module(modname);
1553
1554 /* When there's no vmlinux, don't print warnings about
1555 * unresolved symbols (since there'll be too many ;) */
1556 if (is_vmlinux(modname)) {
1557 have_vmlinux = 1;
1558 mod->skip = 1;
1559 }
1560
1561 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1562 if (info.modinfo && !license && !is_vmlinux(modname))
1563 warn("modpost: missing MODULE_LICENSE() in %s\n"
1564 "see include/linux/module.h for "
1565 "more information\n", modname);
1566 while (license) {
1567 if (license_is_gpl_compatible(license))
1568 mod->gpl_compatible = 1;
1569 else {
1570 mod->gpl_compatible = 0;
1571 break;
1572 }
1573 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1574 "license", license);
1575 }
1576
1577 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1578 symname = info.strtab + sym->st_name;
1579
1580 handle_modversions(mod, &info, sym, symname);
1581 handle_moddevtable(mod, &info, sym, symname);
1582 }
1583 if (!is_vmlinux(modname) ||
1584 (is_vmlinux(modname) && vmlinux_section_warnings))
1585 check_sec_ref(mod, modname, &info);
1586
1587 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1588 if (version)
1589 maybe_frob_rcs_version(modname, version, info.modinfo,
1590 version - (char *)info.hdr);
1591 if (version || (all_versions && !is_vmlinux(modname)))
1592 get_src_version(modname, mod->srcversion,
1593 sizeof(mod->srcversion)-1);
1594
1595 get_markers(&info, mod);
1596
1597 parse_elf_finish(&info);
1598
1599 /* Our trick to get versioning for module struct etc. - it's
1600 * never passed as an argument to an exported function, so
1601 * the automatic versioning doesn't pick it up, but it's really
1602 * important anyhow */
1603 if (modversions)
1604 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1605 }
1606
1607 #define SZ 500
1608
1609 /* We first write the generated file into memory using the
1610 * following helper, then compare to the file on disk and
1611 * only update the later if anything changed */
1612
1613 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1614 const char *fmt, ...)
1615 {
1616 char tmp[SZ];
1617 int len;
1618 va_list ap;
1619
1620 va_start(ap, fmt);
1621 len = vsnprintf(tmp, SZ, fmt, ap);
1622 buf_write(buf, tmp, len);
1623 va_end(ap);
1624 }
1625
1626 void buf_write(struct buffer *buf, const char *s, int len)
1627 {
1628 if (buf->size - buf->pos < len) {
1629 buf->size += len + SZ;
1630 buf->p = realloc(buf->p, buf->size);
1631 }
1632 strncpy(buf->p + buf->pos, s, len);
1633 buf->pos += len;
1634 }
1635
1636 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1637 {
1638 const char *e = is_vmlinux(m) ?"":".ko";
1639
1640 switch (exp) {
1641 case export_gpl:
1642 fatal("modpost: GPL-incompatible module %s%s "
1643 "uses GPL-only symbol '%s'\n", m, e, s);
1644 break;
1645 case export_unused_gpl:
1646 fatal("modpost: GPL-incompatible module %s%s "
1647 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1648 break;
1649 case export_gpl_future:
1650 warn("modpost: GPL-incompatible module %s%s "
1651 "uses future GPL-only symbol '%s'\n", m, e, s);
1652 break;
1653 case export_plain:
1654 case export_unused:
1655 case export_unknown:
1656 /* ignore */
1657 break;
1658 }
1659 }
1660
1661 static void check_for_unused(enum export exp, const char *m, const char *s)
1662 {
1663 const char *e = is_vmlinux(m) ?"":".ko";
1664
1665 switch (exp) {
1666 case export_unused:
1667 case export_unused_gpl:
1668 warn("modpost: module %s%s "
1669 "uses symbol '%s' marked UNUSED\n", m, e, s);
1670 break;
1671 default:
1672 /* ignore */
1673 break;
1674 }
1675 }
1676
1677 static void check_exports(struct module *mod)
1678 {
1679 struct symbol *s, *exp;
1680
1681 for (s = mod->unres; s; s = s->next) {
1682 const char *basename;
1683 exp = find_symbol(s->name);
1684 if (!exp || exp->module == mod)
1685 continue;
1686 basename = strrchr(mod->name, '/');
1687 if (basename)
1688 basename++;
1689 else
1690 basename = mod->name;
1691 if (!mod->gpl_compatible)
1692 check_for_gpl_usage(exp->export, basename, exp->name);
1693 check_for_unused(exp->export, basename, exp->name);
1694 }
1695 }
1696
1697 /**
1698 * Header for the generated file
1699 **/
1700 static void add_header(struct buffer *b, struct module *mod)
1701 {
1702 buf_printf(b, "#include <linux/module.h>\n");
1703 buf_printf(b, "#include <linux/vermagic.h>\n");
1704 buf_printf(b, "#include <linux/compiler.h>\n");
1705 buf_printf(b, "\n");
1706 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1707 buf_printf(b, "\n");
1708 buf_printf(b, "struct module __this_module\n");
1709 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1710 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1711 if (mod->has_init)
1712 buf_printf(b, " .init = init_module,\n");
1713 if (mod->has_cleanup)
1714 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1715 " .exit = cleanup_module,\n"
1716 "#endif\n");
1717 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1718 buf_printf(b, "};\n");
1719 }
1720
1721 void add_staging_flag(struct buffer *b, const char *name)
1722 {
1723 static const char *staging_dir = "drivers/staging";
1724
1725 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1726 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1727 }
1728
1729 /**
1730 * Record CRCs for unresolved symbols
1731 **/
1732 static int add_versions(struct buffer *b, struct module *mod)
1733 {
1734 struct symbol *s, *exp;
1735 int err = 0;
1736
1737 for (s = mod->unres; s; s = s->next) {
1738 exp = find_symbol(s->name);
1739 if (!exp || exp->module == mod) {
1740 if (have_vmlinux && !s->weak) {
1741 if (warn_unresolved) {
1742 warn("\"%s\" [%s.ko] undefined!\n",
1743 s->name, mod->name);
1744 } else {
1745 merror("\"%s\" [%s.ko] undefined!\n",
1746 s->name, mod->name);
1747 err = 1;
1748 }
1749 }
1750 continue;
1751 }
1752 s->module = exp->module;
1753 s->crc_valid = exp->crc_valid;
1754 s->crc = exp->crc;
1755 }
1756
1757 if (!modversions)
1758 return err;
1759
1760 buf_printf(b, "\n");
1761 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1762 buf_printf(b, "__used\n");
1763 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1764
1765 for (s = mod->unres; s; s = s->next) {
1766 if (!s->module)
1767 continue;
1768 if (!s->crc_valid) {
1769 warn("\"%s\" [%s.ko] has no CRC!\n",
1770 s->name, mod->name);
1771 continue;
1772 }
1773 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1774 }
1775
1776 buf_printf(b, "};\n");
1777
1778 return err;
1779 }
1780
1781 static void add_depends(struct buffer *b, struct module *mod,
1782 struct module *modules)
1783 {
1784 struct symbol *s;
1785 struct module *m;
1786 int first = 1;
1787
1788 for (m = modules; m; m = m->next)
1789 m->seen = is_vmlinux(m->name);
1790
1791 buf_printf(b, "\n");
1792 buf_printf(b, "static const char __module_depends[]\n");
1793 buf_printf(b, "__used\n");
1794 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1795 buf_printf(b, "\"depends=");
1796 for (s = mod->unres; s; s = s->next) {
1797 const char *p;
1798 if (!s->module)
1799 continue;
1800
1801 if (s->module->seen)
1802 continue;
1803
1804 s->module->seen = 1;
1805 p = strrchr(s->module->name, '/');
1806 if (p)
1807 p++;
1808 else
1809 p = s->module->name;
1810 buf_printf(b, "%s%s", first ? "" : ",", p);
1811 first = 0;
1812 }
1813 buf_printf(b, "\";\n");
1814 }
1815
1816 static void add_srcversion(struct buffer *b, struct module *mod)
1817 {
1818 if (mod->srcversion[0]) {
1819 buf_printf(b, "\n");
1820 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1821 mod->srcversion);
1822 }
1823 }
1824
1825 static void write_if_changed(struct buffer *b, const char *fname)
1826 {
1827 char *tmp;
1828 FILE *file;
1829 struct stat st;
1830
1831 file = fopen(fname, "r");
1832 if (!file)
1833 goto write;
1834
1835 if (fstat(fileno(file), &st) < 0)
1836 goto close_write;
1837
1838 if (st.st_size != b->pos)
1839 goto close_write;
1840
1841 tmp = NOFAIL(malloc(b->pos));
1842 if (fread(tmp, 1, b->pos, file) != b->pos)
1843 goto free_write;
1844
1845 if (memcmp(tmp, b->p, b->pos) != 0)
1846 goto free_write;
1847
1848 free(tmp);
1849 fclose(file);
1850 return;
1851
1852 free_write:
1853 free(tmp);
1854 close_write:
1855 fclose(file);
1856 write:
1857 file = fopen(fname, "w");
1858 if (!file) {
1859 perror(fname);
1860 exit(1);
1861 }
1862 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1863 perror(fname);
1864 exit(1);
1865 }
1866 fclose(file);
1867 }
1868
1869 /* parse Module.symvers file. line format:
1870 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1871 **/
1872 static void read_dump(const char *fname, unsigned int kernel)
1873 {
1874 unsigned long size, pos = 0;
1875 void *file = grab_file(fname, &size);
1876 char *line;
1877
1878 if (!file)
1879 /* No symbol versions, silently ignore */
1880 return;
1881
1882 while ((line = get_next_line(&pos, file, size))) {
1883 char *symname, *modname, *d, *export, *end;
1884 unsigned int crc;
1885 struct module *mod;
1886 struct symbol *s;
1887
1888 if (!(symname = strchr(line, '\t')))
1889 goto fail;
1890 *symname++ = '\0';
1891 if (!(modname = strchr(symname, '\t')))
1892 goto fail;
1893 *modname++ = '\0';
1894 if ((export = strchr(modname, '\t')) != NULL)
1895 *export++ = '\0';
1896 if (export && ((end = strchr(export, '\t')) != NULL))
1897 *end = '\0';
1898 crc = strtoul(line, &d, 16);
1899 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1900 goto fail;
1901 mod = find_module(modname);
1902 if (!mod) {
1903 if (is_vmlinux(modname))
1904 have_vmlinux = 1;
1905 mod = new_module(modname);
1906 mod->skip = 1;
1907 }
1908 s = sym_add_exported(symname, mod, export_no(export));
1909 s->kernel = kernel;
1910 s->preloaded = 1;
1911 sym_update_crc(symname, mod, crc, export_no(export));
1912 }
1913 return;
1914 fail:
1915 fatal("parse error in symbol dump file\n");
1916 }
1917
1918 /* For normal builds always dump all symbols.
1919 * For external modules only dump symbols
1920 * that are not read from kernel Module.symvers.
1921 **/
1922 static int dump_sym(struct symbol *sym)
1923 {
1924 if (!external_module)
1925 return 1;
1926 if (sym->vmlinux || sym->kernel)
1927 return 0;
1928 return 1;
1929 }
1930
1931 static void write_dump(const char *fname)
1932 {
1933 struct buffer buf = { };
1934 struct symbol *symbol;
1935 int n;
1936
1937 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1938 symbol = symbolhash[n];
1939 while (symbol) {
1940 if (dump_sym(symbol))
1941 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1942 symbol->crc, symbol->name,
1943 symbol->module->name,
1944 export_str(symbol->export));
1945 symbol = symbol->next;
1946 }
1947 }
1948 write_if_changed(&buf, fname);
1949 }
1950
1951 static void add_marker(struct module *mod, const char *name, const char *fmt)
1952 {
1953 char *line = NULL;
1954 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
1955 NOFAIL(line);
1956
1957 mod->markers = NOFAIL(realloc(mod->markers, ((mod->nmarkers + 1) *
1958 sizeof mod->markers[0])));
1959 mod->markers[mod->nmarkers++] = line;
1960 }
1961
1962 static void read_markers(const char *fname)
1963 {
1964 unsigned long size, pos = 0;
1965 void *file = grab_file(fname, &size);
1966 char *line;
1967
1968 if (!file) /* No old markers, silently ignore */
1969 return;
1970
1971 while ((line = get_next_line(&pos, file, size))) {
1972 char *marker, *modname, *fmt;
1973 struct module *mod;
1974
1975 marker = line;
1976 modname = strchr(marker, '\t');
1977 if (!modname)
1978 goto fail;
1979 *modname++ = '\0';
1980 fmt = strchr(modname, '\t');
1981 if (!fmt)
1982 goto fail;
1983 *fmt++ = '\0';
1984 if (*marker == '\0' || *modname == '\0')
1985 goto fail;
1986
1987 mod = find_module(modname);
1988 if (!mod) {
1989 mod = new_module(modname);
1990 mod->skip = 1;
1991 }
1992 if (is_vmlinux(modname)) {
1993 have_vmlinux = 1;
1994 mod->skip = 0;
1995 }
1996
1997 if (!mod->skip)
1998 add_marker(mod, marker, fmt);
1999 }
2000 release_file(file, size);
2001 return;
2002 fail:
2003 fatal("parse error in markers list file\n");
2004 }
2005
2006 static int compare_strings(const void *a, const void *b)
2007 {
2008 return strcmp(*(const char **) a, *(const char **) b);
2009 }
2010
2011 static void write_markers(const char *fname)
2012 {
2013 struct buffer buf = { };
2014 struct module *mod;
2015 size_t i;
2016
2017 for (mod = modules; mod; mod = mod->next)
2018 if ((!external_module || !mod->skip) && mod->markers != NULL) {
2019 /*
2020 * Sort the strings so we can skip duplicates when
2021 * we write them out.
2022 */
2023 qsort(mod->markers, mod->nmarkers,
2024 sizeof mod->markers[0], &compare_strings);
2025 for (i = 0; i < mod->nmarkers; ++i) {
2026 char *line = mod->markers[i];
2027 buf_write(&buf, line, strlen(line));
2028 while (i + 1 < mod->nmarkers &&
2029 !strcmp(mod->markers[i],
2030 mod->markers[i + 1]))
2031 free(mod->markers[i++]);
2032 free(mod->markers[i]);
2033 }
2034 free(mod->markers);
2035 mod->markers = NULL;
2036 }
2037
2038 write_if_changed(&buf, fname);
2039 }
2040
2041 struct ext_sym_list {
2042 struct ext_sym_list *next;
2043 const char *file;
2044 };
2045
2046 int main(int argc, char **argv)
2047 {
2048 struct module *mod;
2049 struct buffer buf = { };
2050 char *kernel_read = NULL, *module_read = NULL;
2051 char *dump_write = NULL;
2052 char *markers_read = NULL;
2053 char *markers_write = NULL;
2054 int opt;
2055 int err;
2056 struct ext_sym_list *extsym_iter;
2057 struct ext_sym_list *extsym_start = NULL;
2058
2059 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2060 switch (opt) {
2061 case 'i':
2062 kernel_read = optarg;
2063 break;
2064 case 'I':
2065 module_read = optarg;
2066 external_module = 1;
2067 break;
2068 case 'c':
2069 cross_build = 1;
2070 break;
2071 case 'e':
2072 external_module = 1;
2073 extsym_iter =
2074 NOFAIL(malloc(sizeof(*extsym_iter)));
2075 extsym_iter->next = extsym_start;
2076 extsym_iter->file = optarg;
2077 extsym_start = extsym_iter;
2078 break;
2079 case 'm':
2080 modversions = 1;
2081 break;
2082 case 'o':
2083 dump_write = optarg;
2084 break;
2085 case 'a':
2086 all_versions = 1;
2087 break;
2088 case 's':
2089 vmlinux_section_warnings = 0;
2090 break;
2091 case 'S':
2092 sec_mismatch_verbose = 0;
2093 break;
2094 case 'w':
2095 warn_unresolved = 1;
2096 break;
2097 case 'M':
2098 markers_write = optarg;
2099 break;
2100 case 'K':
2101 markers_read = optarg;
2102 break;
2103 default:
2104 exit(1);
2105 }
2106 }
2107
2108 if (kernel_read)
2109 read_dump(kernel_read, 1);
2110 if (module_read)
2111 read_dump(module_read, 0);
2112 while (extsym_start) {
2113 read_dump(extsym_start->file, 0);
2114 extsym_iter = extsym_start->next;
2115 free(extsym_start);
2116 extsym_start = extsym_iter;
2117 }
2118
2119 while (optind < argc)
2120 read_symbols(argv[optind++]);
2121
2122 for (mod = modules; mod; mod = mod->next) {
2123 if (mod->skip)
2124 continue;
2125 check_exports(mod);
2126 }
2127
2128 err = 0;
2129
2130 for (mod = modules; mod; mod = mod->next) {
2131 char fname[strlen(mod->name) + 10];
2132
2133 if (mod->skip)
2134 continue;
2135
2136 buf.pos = 0;
2137
2138 add_header(&buf, mod);
2139 add_staging_flag(&buf, mod->name);
2140 err |= add_versions(&buf, mod);
2141 add_depends(&buf, mod, modules);
2142 add_moddevtable(&buf, mod);
2143 add_srcversion(&buf, mod);
2144
2145 sprintf(fname, "%s.mod.c", mod->name);
2146 write_if_changed(&buf, fname);
2147 }
2148
2149 if (dump_write)
2150 write_dump(dump_write);
2151 if (sec_mismatch_count && !sec_mismatch_verbose)
2152 warn("modpost: Found %d section mismatch(es).\n"
2153 "To see full details build your kernel with:\n"
2154 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2155 sec_mismatch_count);
2156
2157 if (markers_read)
2158 read_markers(markers_read);
2159
2160 if (markers_write)
2161 write_markers(markers_write);
2162
2163 return err;
2164 }
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