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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / scripts / mod / modpost.c
blob013e790b6fab19d6e0e66594e884d23e900f8a65
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_shoff = TO_NATIVE(hdr->e_shoff);
388 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
389 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
390 hdr->e_machine = TO_NATIVE(hdr->e_machine);
391 hdr->e_type = TO_NATIVE(hdr->e_type);
392 sechdrs = (void *)hdr + hdr->e_shoff;
393 info->sechdrs = sechdrs;
394
395 /* Check if file offset is correct */
396 if (hdr->e_shoff > info->size) {
397 fatal("section header offset=%lu in file '%s' is bigger than "
398 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
399 filename, info->size);
400 return 0;
401 }
402
403 /* Fix endianness in section headers */
404 for (i = 0; i < hdr->e_shnum; i++) {
405 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
406 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
407 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
408 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
409 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
410 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
411 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
412 }
413 /* Find symbol table. */
414 for (i = 1; i < hdr->e_shnum; i++) {
415 const char *secstrings
416 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
417 const char *secname;
418 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
419
420 if (!nobits && sechdrs[i].sh_offset > info->size) {
421 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
422 "sizeof(*hrd)=%zu\n", filename,
423 (unsigned long)sechdrs[i].sh_offset,
424 sizeof(*hdr));
425 return 0;
426 }
427 secname = secstrings + sechdrs[i].sh_name;
428 if (strcmp(secname, ".modinfo") == 0) {
429 if (nobits)
430 fatal("%s has NOBITS .modinfo\n", filename);
431 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
432 info->modinfo_len = sechdrs[i].sh_size;
433 } else if (strcmp(secname, "__ksymtab") == 0)
434 info->export_sec = i;
435 else if (strcmp(secname, "__ksymtab_unused") == 0)
436 info->export_unused_sec = i;
437 else if (strcmp(secname, "__ksymtab_gpl") == 0)
438 info->export_gpl_sec = i;
439 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
440 info->export_unused_gpl_sec = i;
441 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
442 info->export_gpl_future_sec = i;
443 else if (strcmp(secname, "__markers_strings") == 0)
444 info->markers_strings_sec = i;
445
446 if (sechdrs[i].sh_type != SHT_SYMTAB)
447 continue;
448
449 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
450 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
451 + sechdrs[i].sh_size;
452 info->strtab = (void *)hdr +
453 sechdrs[sechdrs[i].sh_link].sh_offset;
454 }
455 if (!info->symtab_start)
456 fatal("%s has no symtab?\n", filename);
457
458 /* Fix endianness in symbols */
459 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
460 sym->st_shndx = TO_NATIVE(sym->st_shndx);
461 sym->st_name = TO_NATIVE(sym->st_name);
462 sym->st_value = TO_NATIVE(sym->st_value);
463 sym->st_size = TO_NATIVE(sym->st_size);
464 }
465 return 1;
466 }
467
468 static void parse_elf_finish(struct elf_info *info)
469 {
470 release_file(info->hdr, info->size);
471 }
472
473 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
474 {
475 /* ignore __this_module, it will be resolved shortly */
476 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
477 return 1;
478 /* ignore global offset table */
479 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
480 return 1;
481 if (info->hdr->e_machine == EM_PPC)
482 /* Special register function linked on all modules during final link of .ko */
483 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
484 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
485 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
486 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
487 return 1;
488 /* Do not ignore this symbol */
489 return 0;
490 }
491
492 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
493 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
494
495 static void handle_modversions(struct module *mod, struct elf_info *info,
496 Elf_Sym *sym, const char *symname)
497 {
498 unsigned int crc;
499 enum export export = export_from_sec(info, sym->st_shndx);
500
501 switch (sym->st_shndx) {
502 case SHN_COMMON:
503 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
504 break;
505 case SHN_ABS:
506 /* CRC'd symbol */
507 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
508 crc = (unsigned int) sym->st_value;
509 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
510 export);
511 }
512 break;
513 case SHN_UNDEF:
514 /* undefined symbol */
515 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
516 ELF_ST_BIND(sym->st_info) != STB_WEAK)
517 break;
518 if (ignore_undef_symbol(info, symname))
519 break;
520 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
521 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
522 /* add compatibility with older glibc */
523 #ifndef STT_SPARC_REGISTER
524 #define STT_SPARC_REGISTER STT_REGISTER
525 #endif
526 if (info->hdr->e_machine == EM_SPARC ||
527 info->hdr->e_machine == EM_SPARCV9) {
528 /* Ignore register directives. */
529 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
530 break;
531 if (symname[0] == '.') {
532 char *munged = strdup(symname);
533 munged[0] = '_';
534 munged[1] = toupper(munged[1]);
535 symname = munged;
536 }
537 }
538 #endif
539
540 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
541 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
542 mod->unres =
543 alloc_symbol(symname +
544 strlen(MODULE_SYMBOL_PREFIX),
545 ELF_ST_BIND(sym->st_info) == STB_WEAK,
546 mod->unres);
547 }
548 break;
549 default:
550 /* All exported symbols */
551 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
552 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
553 export);
554 }
555 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
556 mod->has_init = 1;
557 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
558 mod->has_cleanup = 1;
559 break;
560 }
561 }
562
563 /**
564 * Parse tag=value strings from .modinfo section
565 **/
566 static char *next_string(char *string, unsigned long *secsize)
567 {
568 /* Skip non-zero chars */
569 while (string[0]) {
570 string++;
571 if ((*secsize)-- <= 1)
572 return NULL;
573 }
574
575 /* Skip any zero padding. */
576 while (!string[0]) {
577 string++;
578 if ((*secsize)-- <= 1)
579 return NULL;
580 }
581 return string;
582 }
583
584 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
585 const char *tag, char *info)
586 {
587 char *p;
588 unsigned int taglen = strlen(tag);
589 unsigned long size = modinfo_len;
590
591 if (info) {
592 size -= info - (char *)modinfo;
593 modinfo = next_string(info, &size);
594 }
595
596 for (p = modinfo; p; p = next_string(p, &size)) {
597 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
598 return p + taglen + 1;
599 }
600 return NULL;
601 }
602
603 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
604 const char *tag)
605
606 {
607 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
608 }
609
610 /**
611 * Test if string s ends in string sub
612 * return 0 if match
613 **/
614 static int strrcmp(const char *s, const char *sub)
615 {
616 int slen, sublen;
617
618 if (!s || !sub)
619 return 1;
620
621 slen = strlen(s);
622 sublen = strlen(sub);
623
624 if ((slen == 0) || (sublen == 0))
625 return 1;
626
627 if (sublen > slen)
628 return 1;
629
630 return memcmp(s + slen - sublen, sub, sublen);
631 }
632
633 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
634 {
635 if (sym)
636 return elf->strtab + sym->st_name;
637 else
638 return "(unknown)";
639 }
640
641 static const char *sec_name(struct elf_info *elf, int shndx)
642 {
643 Elf_Shdr *sechdrs = elf->sechdrs;
644 return (void *)elf->hdr +
645 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
646 sechdrs[shndx].sh_name;
647 }
648
649 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
650 {
651 return (void *)elf->hdr +
652 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
653 sechdr->sh_name;
654 }
655
656 /* if sym is empty or point to a string
657 * like ".[0-9]+" then return 1.
658 * This is the optional prefix added by ld to some sections
659 */
660 static int number_prefix(const char *sym)
661 {
662 if (*sym++ == '\0')
663 return 1;
664 if (*sym != '.')
665 return 0;
666 do {
667 char c = *sym++;
668 if (c < '0' || c > '9')
669 return 0;
670 } while (*sym);
671 return 1;
672 }
673
674 /* The pattern is an array of simple patterns.
675 * "foo" will match an exact string equal to "foo"
676 * "*foo" will match a string that ends with "foo"
677 * "foo*" will match a string that begins with "foo"
678 * "foo$" will match a string equal to "foo" or "foo.1"
679 * where the '1' can be any number including several digits.
680 * The $ syntax is for sections where ld append a dot number
681 * to make section name unique.
682 */
683 int match(const char *sym, const char * const pat[])
684 {
685 const char *p;
686 while (*pat) {
687 p = *pat++;
688 const char *endp = p + strlen(p) - 1;
689
690 /* "*foo" */
691 if (*p == '*') {
692 if (strrcmp(sym, p + 1) == 0)
693 return 1;
694 }
695 /* "foo*" */
696 else if (*endp == '*') {
697 if (strncmp(sym, p, strlen(p) - 1) == 0)
698 return 1;
699 }
700 /* "foo$" */
701 else if (*endp == '$') {
702 if (strncmp(sym, p, strlen(p) - 1) == 0) {
703 if (number_prefix(sym + strlen(p) - 1))
704 return 1;
705 }
706 }
707 /* no wildcards */
708 else {
709 if (strcmp(p, sym) == 0)
710 return 1;
711 }
712 }
713 /* no match */
714 return 0;
715 }
716
717 /* sections that we do not want to do full section mismatch check on */
718 static const char *section_white_list[] =
719 { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL };
720
721 /*
722 * Is this section one we do not want to check?
723 * This is often debug sections.
724 * If we are going to check this section then
725 * test if section name ends with a dot and a number.
726 * This is used to find sections where the linker have
727 * appended a dot-number to make the name unique.
728 * The cause of this is often a section specified in assembler
729 * without "ax" / "aw" and the same section used in .c
730 * code where gcc add these.
731 */
732 static int check_section(const char *modname, const char *sec)
733 {
734 const char *e = sec + strlen(sec) - 1;
735 if (match(sec, section_white_list))
736 return 1;
737
738 if (*e && isdigit(*e)) {
739 /* consume all digits */
740 while (*e && e != sec && isdigit(*e))
741 e--;
742 if (*e == '.' && !strstr(sec, ".linkonce")) {
743 warn("%s (%s): unexpected section name.\n"
744 "The (.[number]+) following section name are "
745 "ld generated and not expected.\n"
746 "Did you forget to use \"ax\"/\"aw\" "
747 "in a .S file?\n"
748 "Note that for example <linux/init.h> contains\n"
749 "section definitions for use in .S files.\n\n",
750 modname, sec);
751 }
752 }
753 return 0;
754 }
755
756
757
758 #define ALL_INIT_DATA_SECTIONS \
759 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
760 #define ALL_EXIT_DATA_SECTIONS \
761 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
762
763 #define ALL_INIT_TEXT_SECTIONS \
764 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
765 #define ALL_EXIT_TEXT_SECTIONS \
766 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
767
768 #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS
769 #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS
770
771 #define DATA_SECTIONS ".data$", ".data.rel$"
772 #define TEXT_SECTIONS ".text$"
773
774 #define INIT_SECTIONS ".init.data$", ".init.text$"
775 #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$"
776 #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$"
777 #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$"
778
779 #define EXIT_SECTIONS ".exit.data$", ".exit.text$"
780 #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$"
781 #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$"
782 #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$"
783
784 /* init data sections */
785 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
786
787 /* all init sections */
788 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
789
790 /* All init and exit sections (code + data) */
791 static const char *init_exit_sections[] =
792 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
793
794 /* data section */
795 static const char *data_sections[] = { DATA_SECTIONS, NULL };
796
797 /* sections that may refer to an init/exit section with no warning */
798 static const char *initref_sections[] =
799 {
800 ".text.init.refok*",
801 ".exit.text.refok*",
802 ".data.init.refok*",
803 NULL
804 };
805
806
807 /* symbols in .data that may refer to init/exit sections */
808 static const char *symbol_white_list[] =
809 {
810 "*driver",
811 "*_template", /* scsi uses *_template a lot */
812 "*_timer", /* arm uses ops structures named _timer a lot */
813 "*_sht", /* scsi also used *_sht to some extent */
814 "*_ops",
815 "*_probe",
816 "*_probe_one",
817 "*_console",
818 NULL
819 };
820
821 static const char *head_sections[] = { ".head.text*", NULL };
822 static const char *linker_symbols[] =
823 { "__init_begin", "_sinittext", "_einittext", NULL };
824
825 enum mismatch {
826 NO_MISMATCH,
827 TEXT_TO_INIT,
828 DATA_TO_INIT,
829 TEXT_TO_EXIT,
830 DATA_TO_EXIT,
831 XXXINIT_TO_INIT,
832 XXXEXIT_TO_EXIT,
833 INIT_TO_EXIT,
834 EXIT_TO_INIT,
835 EXPORT_TO_INIT_EXIT,
836 };
837
838 struct sectioncheck {
839 const char *fromsec[20];
840 const char *tosec[20];
841 enum mismatch mismatch;
842 };
843
844 const struct sectioncheck sectioncheck[] = {
845 /* Do not reference init/exit code/data from
846 * normal code and data
847 */
848 {
849 .fromsec = { TEXT_SECTIONS, NULL },
850 .tosec = { ALL_INIT_SECTIONS, NULL },
851 .mismatch = TEXT_TO_INIT,
852 },
853 {
854 .fromsec = { DATA_SECTIONS, NULL },
855 .tosec = { ALL_INIT_SECTIONS, NULL },
856 .mismatch = DATA_TO_INIT,
857 },
858 {
859 .fromsec = { TEXT_SECTIONS, NULL },
860 .tosec = { ALL_EXIT_SECTIONS, NULL },
861 .mismatch = TEXT_TO_EXIT,
862 },
863 {
864 .fromsec = { DATA_SECTIONS, NULL },
865 .tosec = { ALL_EXIT_SECTIONS, NULL },
866 .mismatch = DATA_TO_EXIT,
867 },
868 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
869 {
870 .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL },
871 .tosec = { INIT_SECTIONS, NULL },
872 .mismatch = XXXINIT_TO_INIT,
873 },
874 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
875 {
876 .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
877 .tosec = { EXIT_SECTIONS, NULL },
878 .mismatch = XXXEXIT_TO_EXIT,
879 },
880 /* Do not use exit code/data from init code */
881 {
882 .fromsec = { ALL_INIT_SECTIONS, NULL },
883 .tosec = { ALL_EXIT_SECTIONS, NULL },
884 .mismatch = INIT_TO_EXIT,
885 },
886 /* Do not use init code/data from exit code */
887 {
888 .fromsec = { ALL_EXIT_SECTIONS, NULL },
889 .tosec = { ALL_INIT_SECTIONS, NULL },
890 .mismatch = EXIT_TO_INIT,
891 },
892 /* Do not export init/exit functions or data */
893 {
894 .fromsec = { "__ksymtab*", NULL },
895 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
896 .mismatch = EXPORT_TO_INIT_EXIT
897 }
898 };
899
900 static int section_mismatch(const char *fromsec, const char *tosec)
901 {
902 int i;
903 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
904 const struct sectioncheck *check = &sectioncheck[0];
905
906 for (i = 0; i < elems; i++) {
907 if (match(fromsec, check->fromsec) &&
908 match(tosec, check->tosec))
909 return check->mismatch;
910 check++;
911 }
912 return NO_MISMATCH;
913 }
914
915 /**
916 * Whitelist to allow certain references to pass with no warning.
917 *
918 * Pattern 0:
919 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
920 * The pattern is identified by:
921 * fromsec = .text.init.refok* | .data.init.refok*
922 *
923 * Pattern 1:
924 * If a module parameter is declared __initdata and permissions=0
925 * then this is legal despite the warning generated.
926 * We cannot see value of permissions here, so just ignore
927 * this pattern.
928 * The pattern is identified by:
929 * tosec = .init.data
930 * fromsec = .data*
931 * atsym =__param*
932 *
933 * Pattern 2:
934 * Many drivers utilise a *driver container with references to
935 * add, remove, probe functions etc.
936 * These functions may often be marked __init and we do not want to
937 * warn here.
938 * the pattern is identified by:
939 * tosec = init or exit section
940 * fromsec = data section
941 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
942 * *probe_one, *_console, *_timer
943 *
944 * Pattern 3:
945 * Whitelist all refereces from .text.head to .init.data
946 * Whitelist all refereces from .text.head to .init.text
947 *
948 * Pattern 4:
949 * Some symbols belong to init section but still it is ok to reference
950 * these from non-init sections as these symbols don't have any memory
951 * allocated for them and symbol address and value are same. So even
952 * if init section is freed, its ok to reference those symbols.
953 * For ex. symbols marking the init section boundaries.
954 * This pattern is identified by
955 * refsymname = __init_begin, _sinittext, _einittext
956 *
957 **/
958 static int secref_whitelist(const char *fromsec, const char *fromsym,
959 const char *tosec, const char *tosym)
960 {
961 /* Check for pattern 0 */
962 if (match(fromsec, initref_sections))
963 return 0;
964
965 /* Check for pattern 1 */
966 if (match(tosec, init_data_sections) &&
967 match(fromsec, data_sections) &&
968 (strncmp(fromsym, "__param", strlen("__param")) == 0))
969 return 0;
970
971 /* Check for pattern 2 */
972 if (match(tosec, init_exit_sections) &&
973 match(fromsec, data_sections) &&
974 match(fromsym, symbol_white_list))
975 return 0;
976
977 /* Check for pattern 3 */
978 if (match(fromsec, head_sections) &&
979 match(tosec, init_sections))
980 return 0;
981
982 /* Check for pattern 4 */
983 if (match(tosym, linker_symbols))
984 return 0;
985
986 return 1;
987 }
988
989 /**
990 * Find symbol based on relocation record info.
991 * In some cases the symbol supplied is a valid symbol so
992 * return refsym. If st_name != 0 we assume this is a valid symbol.
993 * In other cases the symbol needs to be looked up in the symbol table
994 * based on section and address.
995 * **/
996 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
997 Elf_Sym *relsym)
998 {
999 Elf_Sym *sym;
1000 Elf_Sym *near = NULL;
1001 Elf64_Sword distance = 20;
1002 Elf64_Sword d;
1003
1004 if (relsym->st_name != 0)
1005 return relsym;
1006 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1007 if (sym->st_shndx != relsym->st_shndx)
1008 continue;
1009 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1010 continue;
1011 if (sym->st_value == addr)
1012 return sym;
1013 /* Find a symbol nearby - addr are maybe negative */
1014 d = sym->st_value - addr;
1015 if (d < 0)
1016 d = addr - sym->st_value;
1017 if (d < distance) {
1018 distance = d;
1019 near = sym;
1020 }
1021 }
1022 /* We need a close match */
1023 if (distance < 20)
1024 return near;
1025 else
1026 return NULL;
1027 }
1028
1029 static inline int is_arm_mapping_symbol(const char *str)
1030 {
1031 return str[0] == '$' && strchr("atd", str[1])
1032 && (str[2] == '\0' || str[2] == '.');
1033 }
1034
1035 /*
1036 * If there's no name there, ignore it; likewise, ignore it if it's
1037 * one of the magic symbols emitted used by current ARM tools.
1038 *
1039 * Otherwise if find_symbols_between() returns those symbols, they'll
1040 * fail the whitelist tests and cause lots of false alarms ... fixable
1041 * only by merging __exit and __init sections into __text, bloating
1042 * the kernel (which is especially evil on embedded platforms).
1043 */
1044 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1045 {
1046 const char *name = elf->strtab + sym->st_name;
1047
1048 if (!name || !strlen(name))
1049 return 0;
1050 return !is_arm_mapping_symbol(name);
1051 }
1052
1053 /*
1054 * Find symbols before or equal addr and after addr - in the section sec.
1055 * If we find two symbols with equal offset prefer one with a valid name.
1056 * The ELF format may have a better way to detect what type of symbol
1057 * it is, but this works for now.
1058 **/
1059 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1060 const char *sec)
1061 {
1062 Elf_Sym *sym;
1063 Elf_Sym *near = NULL;
1064 Elf_Addr distance = ~0;
1065
1066 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1067 const char *symsec;
1068
1069 if (sym->st_shndx >= SHN_LORESERVE)
1070 continue;
1071 symsec = sec_name(elf, sym->st_shndx);
1072 if (strcmp(symsec, sec) != 0)
1073 continue;
1074 if (!is_valid_name(elf, sym))
1075 continue;
1076 if (sym->st_value <= addr) {
1077 if ((addr - sym->st_value) < distance) {
1078 distance = addr - sym->st_value;
1079 near = sym;
1080 } else if ((addr - sym->st_value) == distance) {
1081 near = sym;
1082 }
1083 }
1084 }
1085 return near;
1086 }
1087
1088 /*
1089 * Convert a section name to the function/data attribute
1090 * .init.text => __init
1091 * .cpuinit.data => __cpudata
1092 * .memexitconst => __memconst
1093 * etc.
1094 */
1095 static char *sec2annotation(const char *s)
1096 {
1097 if (match(s, init_exit_sections)) {
1098 char *p = malloc(20);
1099 char *r = p;
1100
1101 *p++ = '_';
1102 *p++ = '_';
1103 if (*s == '.')
1104 s++;
1105 while (*s && *s != '.')
1106 *p++ = *s++;
1107 *p = '\0';
1108 if (*s == '.')
1109 s++;
1110 if (strstr(s, "rodata") != NULL)
1111 strcat(p, "const ");
1112 else if (strstr(s, "data") != NULL)
1113 strcat(p, "data ");
1114 else
1115 strcat(p, " ");
1116 return r; /* we leak her but we do not care */
1117 } else {
1118 return "";
1119 }
1120 }
1121
1122 static int is_function(Elf_Sym *sym)
1123 {
1124 if (sym)
1125 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1126 else
1127 return -1;
1128 }
1129
1130 /*
1131 * Print a warning about a section mismatch.
1132 * Try to find symbols near it so user can find it.
1133 * Check whitelist before warning - it may be a false positive.
1134 */
1135 static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
1136 const char *fromsec,
1137 unsigned long long fromaddr,
1138 const char *fromsym,
1139 int from_is_func,
1140 const char *tosec, const char *tosym,
1141 int to_is_func)
1142 {
1143 const char *from, *from_p;
1144 const char *to, *to_p;
1145
1146 switch (from_is_func) {
1147 case 0: from = "variable"; from_p = ""; break;
1148 case 1: from = "function"; from_p = "()"; break;
1149 default: from = "(unknown reference)"; from_p = ""; break;
1150 }
1151 switch (to_is_func) {
1152 case 0: to = "variable"; to_p = ""; break;
1153 case 1: to = "function"; to_p = "()"; break;
1154 default: to = "(unknown reference)"; to_p = ""; break;
1155 }
1156
1157 sec_mismatch_count++;
1158 if (!sec_mismatch_verbose)
1159 return;
1160
1161 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1162 "to the %s %s:%s%s\n",
1163 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1164 tosym, to_p);
1165
1166 switch (mismatch) {
1167 case TEXT_TO_INIT:
1168 fprintf(stderr,
1169 "The function %s%s() references\n"
1170 "the %s %s%s%s.\n"
1171 "This is often because %s lacks a %s\n"
1172 "annotation or the annotation of %s is wrong.\n",
1173 sec2annotation(fromsec), fromsym,
1174 to, sec2annotation(tosec), tosym, to_p,
1175 fromsym, sec2annotation(tosec), tosym);
1176 break;
1177 case DATA_TO_INIT: {
1178 const char **s = symbol_white_list;
1179 fprintf(stderr,
1180 "The variable %s references\n"
1181 "the %s %s%s%s\n"
1182 "If the reference is valid then annotate the\n"
1183 "variable with __init* (see linux/init.h) "
1184 "or name the variable:\n",
1185 fromsym, to, sec2annotation(tosec), tosym, to_p);
1186 while (*s)
1187 fprintf(stderr, "%s, ", *s++);
1188 fprintf(stderr, "\n");
1189 break;
1190 }
1191 case TEXT_TO_EXIT:
1192 fprintf(stderr,
1193 "The function %s() references a %s in an exit section.\n"
1194 "Often the %s %s%s has valid usage outside the exit section\n"
1195 "and the fix is to remove the %sannotation of %s.\n",
1196 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
1197 break;
1198 case DATA_TO_EXIT: {
1199 const char **s = symbol_white_list;
1200 fprintf(stderr,
1201 "The variable %s references\n"
1202 "the %s %s%s%s\n"
1203 "If the reference is valid then annotate the\n"
1204 "variable with __exit* (see linux/init.h) or "
1205 "name the variable:\n",
1206 fromsym, to, sec2annotation(tosec), tosym, to_p);
1207 while (*s)
1208 fprintf(stderr, "%s, ", *s++);
1209 fprintf(stderr, "\n");
1210 break;
1211 }
1212 case XXXINIT_TO_INIT:
1213 case XXXEXIT_TO_EXIT:
1214 fprintf(stderr,
1215 "The %s %s%s%s references\n"
1216 "a %s %s%s%s.\n"
1217 "If %s is only used by %s then\n"
1218 "annotate %s with a matching annotation.\n",
1219 from, sec2annotation(fromsec), fromsym, from_p,
1220 to, sec2annotation(tosec), tosym, to_p,
1221 tosym, fromsym, tosym);
1222 break;
1223 case INIT_TO_EXIT:
1224 fprintf(stderr,
1225 "The %s %s%s%s references\n"
1226 "a %s %s%s%s.\n"
1227 "This is often seen when error handling "
1228 "in the init function\n"
1229 "uses functionality in the exit path.\n"
1230 "The fix is often to remove the %sannotation of\n"
1231 "%s%s so it may be used outside an exit section.\n",
1232 from, sec2annotation(fromsec), fromsym, from_p,
1233 to, sec2annotation(tosec), tosym, to_p,
1234 sec2annotation(tosec), tosym, to_p);
1235 break;
1236 case EXIT_TO_INIT:
1237 fprintf(stderr,
1238 "The %s %s%s%s references\n"
1239 "a %s %s%s%s.\n"
1240 "This is often seen when error handling "
1241 "in the exit function\n"
1242 "uses functionality in the init path.\n"
1243 "The fix is often to remove the %sannotation of\n"
1244 "%s%s so it may be used outside an init section.\n",
1245 from, sec2annotation(fromsec), fromsym, from_p,
1246 to, sec2annotation(tosec), tosym, to_p,
1247 sec2annotation(tosec), tosym, to_p);
1248 break;
1249 case EXPORT_TO_INIT_EXIT:
1250 fprintf(stderr,
1251 "The symbol %s is exported and annotated %s\n"
1252 "Fix this by removing the %sannotation of %s "
1253 "or drop the export.\n",
1254 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
1255 case NO_MISMATCH:
1256 /* To get warnings on missing members */
1257 break;
1258 }
1259 fprintf(stderr, "\n");
1260 }
1261
1262 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1263 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1264 {
1265 const char *tosec;
1266 enum mismatch mismatch;
1267
1268 tosec = sec_name(elf, sym->st_shndx);
1269 mismatch = section_mismatch(fromsec, tosec);
1270 if (mismatch != NO_MISMATCH) {
1271 Elf_Sym *to;
1272 Elf_Sym *from;
1273 const char *tosym;
1274 const char *fromsym;
1275
1276 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1277 fromsym = sym_name(elf, from);
1278 to = find_elf_symbol(elf, r->r_addend, sym);
1279 tosym = sym_name(elf, to);
1280
1281 /* check whitelist - we may ignore it */
1282 if (secref_whitelist(fromsec, fromsym, tosec, tosym)) {
1283 report_sec_mismatch(modname, mismatch,
1284 fromsec, r->r_offset, fromsym,
1285 is_function(from), tosec, tosym,
1286 is_function(to));
1287 }
1288 }
1289 }
1290
1291 static unsigned int *reloc_location(struct elf_info *elf,
1292 Elf_Shdr *sechdr, Elf_Rela *r)
1293 {
1294 Elf_Shdr *sechdrs = elf->sechdrs;
1295 int section = sechdr->sh_info;
1296
1297 return (void *)elf->hdr + sechdrs[section].sh_offset +
1298 (r->r_offset - sechdrs[section].sh_addr);
1299 }
1300
1301 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1302 {
1303 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1304 unsigned int *location = reloc_location(elf, sechdr, r);
1305
1306 switch (r_typ) {
1307 case R_386_32:
1308 r->r_addend = TO_NATIVE(*location);
1309 break;
1310 case R_386_PC32:
1311 r->r_addend = TO_NATIVE(*location) + 4;
1312 /* For CONFIG_RELOCATABLE=y */
1313 if (elf->hdr->e_type == ET_EXEC)
1314 r->r_addend += r->r_offset;
1315 break;
1316 }
1317 return 0;
1318 }
1319
1320 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1321 {
1322 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1323
1324 switch (r_typ) {
1325 case R_ARM_ABS32:
1326 /* From ARM ABI: (S + A) | T */
1327 r->r_addend = (int)(long)
1328 (elf->symtab_start + ELF_R_SYM(r->r_info));
1329 break;
1330 case R_ARM_PC24:
1331 /* From ARM ABI: ((S + A) | T) - P */
1332 r->r_addend = (int)(long)(elf->hdr +
1333 sechdr->sh_offset +
1334 (r->r_offset - sechdr->sh_addr));
1335 break;
1336 default:
1337 return 1;
1338 }
1339 return 0;
1340 }
1341
1342 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1343 {
1344 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1345 unsigned int *location = reloc_location(elf, sechdr, r);
1346 unsigned int inst;
1347
1348 if (r_typ == R_MIPS_HI16)
1349 return 1; /* skip this */
1350 inst = TO_NATIVE(*location);
1351 switch (r_typ) {
1352 case R_MIPS_LO16:
1353 r->r_addend = inst & 0xffff;
1354 break;
1355 case R_MIPS_26:
1356 r->r_addend = (inst & 0x03ffffff) << 2;
1357 break;
1358 case R_MIPS_32:
1359 r->r_addend = inst;
1360 break;
1361 }
1362 return 0;
1363 }
1364
1365 static void section_rela(const char *modname, struct elf_info *elf,
1366 Elf_Shdr *sechdr)
1367 {
1368 Elf_Sym *sym;
1369 Elf_Rela *rela;
1370 Elf_Rela r;
1371 unsigned int r_sym;
1372 const char *fromsec;
1373
1374 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1375 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1376
1377 fromsec = sech_name(elf, sechdr);
1378 fromsec += strlen(".rela");
1379 /* if from section (name) is know good then skip it */
1380 if (check_section(modname, fromsec))
1381 return;
1382
1383 for (rela = start; rela < stop; rela++) {
1384 r.r_offset = TO_NATIVE(rela->r_offset);
1385 #if KERNEL_ELFCLASS == ELFCLASS64
1386 if (elf->hdr->e_machine == EM_MIPS) {
1387 unsigned int r_typ;
1388 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1389 r_sym = TO_NATIVE(r_sym);
1390 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1391 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1392 } else {
1393 r.r_info = TO_NATIVE(rela->r_info);
1394 r_sym = ELF_R_SYM(r.r_info);
1395 }
1396 #else
1397 r.r_info = TO_NATIVE(rela->r_info);
1398 r_sym = ELF_R_SYM(r.r_info);
1399 #endif
1400 r.r_addend = TO_NATIVE(rela->r_addend);
1401 sym = elf->symtab_start + r_sym;
1402 /* Skip special sections */
1403 if (sym->st_shndx >= SHN_LORESERVE)
1404 continue;
1405 check_section_mismatch(modname, elf, &r, sym, fromsec);
1406 }
1407 }
1408
1409 static void section_rel(const char *modname, struct elf_info *elf,
1410 Elf_Shdr *sechdr)
1411 {
1412 Elf_Sym *sym;
1413 Elf_Rel *rel;
1414 Elf_Rela r;
1415 unsigned int r_sym;
1416 const char *fromsec;
1417
1418 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1419 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1420
1421 fromsec = sech_name(elf, sechdr);
1422 fromsec += strlen(".rel");
1423 /* if from section (name) is know good then skip it */
1424 if (check_section(modname, fromsec))
1425 return;
1426
1427 for (rel = start; rel < stop; rel++) {
1428 r.r_offset = TO_NATIVE(rel->r_offset);
1429 #if KERNEL_ELFCLASS == ELFCLASS64
1430 if (elf->hdr->e_machine == EM_MIPS) {
1431 unsigned int r_typ;
1432 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1433 r_sym = TO_NATIVE(r_sym);
1434 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1435 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1436 } else {
1437 r.r_info = TO_NATIVE(rel->r_info);
1438 r_sym = ELF_R_SYM(r.r_info);
1439 }
1440 #else
1441 r.r_info = TO_NATIVE(rel->r_info);
1442 r_sym = ELF_R_SYM(r.r_info);
1443 #endif
1444 r.r_addend = 0;
1445 switch (elf->hdr->e_machine) {
1446 case EM_386:
1447 if (addend_386_rel(elf, sechdr, &r))
1448 continue;
1449 break;
1450 case EM_ARM:
1451 if (addend_arm_rel(elf, sechdr, &r))
1452 continue;
1453 break;
1454 case EM_MIPS:
1455 if (addend_mips_rel(elf, sechdr, &r))
1456 continue;
1457 break;
1458 }
1459 sym = elf->symtab_start + r_sym;
1460 /* Skip special sections */
1461 if (sym->st_shndx >= SHN_LORESERVE)
1462 continue;
1463 check_section_mismatch(modname, elf, &r, sym, fromsec);
1464 }
1465 }
1466
1467 /**
1468 * A module includes a number of sections that are discarded
1469 * either when loaded or when used as built-in.
1470 * For loaded modules all functions marked __init and all data
1471 * marked __initdata will be discarded when the module has been intialized.
1472 * Likewise for modules used built-in the sections marked __exit
1473 * are discarded because __exit marked function are supposed to be called
1474 * only when a module is unloaded which never happens for built-in modules.
1475 * The check_sec_ref() function traverses all relocation records
1476 * to find all references to a section that reference a section that will
1477 * be discarded and warns about it.
1478 **/
1479 static void check_sec_ref(struct module *mod, const char *modname,
1480 struct elf_info *elf)
1481 {
1482 int i;
1483 Elf_Shdr *sechdrs = elf->sechdrs;
1484
1485 /* Walk through all sections */
1486 for (i = 0; i < elf->hdr->e_shnum; i++) {
1487 /* We want to process only relocation sections and not .init */
1488 if (sechdrs[i].sh_type == SHT_RELA)
1489 section_rela(modname, elf, &elf->sechdrs[i]);
1490 else if (sechdrs[i].sh_type == SHT_REL)
1491 section_rel(modname, elf, &elf->sechdrs[i]);
1492 }
1493 }
1494
1495 static void get_markers(struct elf_info *info, struct module *mod)
1496 {
1497 const Elf_Shdr *sh = &info->sechdrs[info->markers_strings_sec];
1498 const char *strings = (const char *) info->hdr + sh->sh_offset;
1499 const Elf_Sym *sym, *first_sym, *last_sym;
1500 size_t n;
1501
1502 if (!info->markers_strings_sec)
1503 return;
1504
1505 /*
1506 * First count the strings. We look for all the symbols defined
1507 * in the __markers_strings section named __mstrtab_*. For
1508 * these local names, the compiler puts a random .NNN suffix on,
1509 * so the names don't correspond exactly.
1510 */
1511 first_sym = last_sym = NULL;
1512 n = 0;
1513 for (sym = info->symtab_start; sym < info->symtab_stop; sym++)
1514 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT &&
1515 sym->st_shndx == info->markers_strings_sec &&
1516 !strncmp(info->strtab + sym->st_name,
1517 "__mstrtab_", sizeof "__mstrtab_" - 1)) {
1518 if (first_sym == NULL)
1519 first_sym = sym;
1520 last_sym = sym;
1521 ++n;
1522 }
1523
1524 if (n == 0)
1525 return;
1526
1527 /*
1528 * Now collect each name and format into a line for the output.
1529 * Lines look like:
1530 * marker_name vmlinux marker %s format %d
1531 * The format string after the second \t can use whitespace.
1532 */
1533 mod->markers = NOFAIL(malloc(sizeof mod->markers[0] * n));
1534 mod->nmarkers = n;
1535
1536 n = 0;
1537 for (sym = first_sym; sym <= last_sym; sym++)
1538 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT &&
1539 sym->st_shndx == info->markers_strings_sec &&
1540 !strncmp(info->strtab + sym->st_name,
1541 "__mstrtab_", sizeof "__mstrtab_" - 1)) {
1542 const char *name = strings + sym->st_value;
1543 const char *fmt = strchr(name, '\0') + 1;
1544 char *line = NULL;
1545 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
1546 NOFAIL(line);
1547 mod->markers[n++] = line;
1548 }
1549 }
1550
1551 static void read_symbols(char *modname)
1552 {
1553 const char *symname;
1554 char *version;
1555 char *license;
1556 struct module *mod;
1557 struct elf_info info = { };
1558 Elf_Sym *sym;
1559
1560 if (!parse_elf(&info, modname))
1561 return;
1562
1563 mod = new_module(modname);
1564
1565 /* When there's no vmlinux, don't print warnings about
1566 * unresolved symbols (since there'll be too many ;) */
1567 if (is_vmlinux(modname)) {
1568 have_vmlinux = 1;
1569 mod->skip = 1;
1570 }
1571
1572 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1573 if (info.modinfo && !license && !is_vmlinux(modname))
1574 warn("modpost: missing MODULE_LICENSE() in %s\n"
1575 "see include/linux/module.h for "
1576 "more information\n", modname);
1577 while (license) {
1578 if (license_is_gpl_compatible(license))
1579 mod->gpl_compatible = 1;
1580 else {
1581 mod->gpl_compatible = 0;
1582 break;
1583 }
1584 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1585 "license", license);
1586 }
1587
1588 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1589 symname = info.strtab + sym->st_name;
1590
1591 handle_modversions(mod, &info, sym, symname);
1592 handle_moddevtable(mod, &info, sym, symname);
1593 }
1594 if (!is_vmlinux(modname) ||
1595 (is_vmlinux(modname) && vmlinux_section_warnings))
1596 check_sec_ref(mod, modname, &info);
1597
1598 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1599 if (version)
1600 maybe_frob_rcs_version(modname, version, info.modinfo,
1601 version - (char *)info.hdr);
1602 if (version || (all_versions && !is_vmlinux(modname)))
1603 get_src_version(modname, mod->srcversion,
1604 sizeof(mod->srcversion)-1);
1605
1606 get_markers(&info, mod);
1607
1608 parse_elf_finish(&info);
1609
1610 /* Our trick to get versioning for struct_module - it's
1611 * never passed as an argument to an exported function, so
1612 * the automatic versioning doesn't pick it up, but it's really
1613 * important anyhow */
1614 if (modversions)
1615 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1616 }
1617
1618 #define SZ 500
1619
1620 /* We first write the generated file into memory using the
1621 * following helper, then compare to the file on disk and
1622 * only update the later if anything changed */
1623
1624 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1625 const char *fmt, ...)
1626 {
1627 char tmp[SZ];
1628 int len;
1629 va_list ap;
1630
1631 va_start(ap, fmt);
1632 len = vsnprintf(tmp, SZ, fmt, ap);
1633 buf_write(buf, tmp, len);
1634 va_end(ap);
1635 }
1636
1637 void buf_write(struct buffer *buf, const char *s, int len)
1638 {
1639 if (buf->size - buf->pos < len) {
1640 buf->size += len + SZ;
1641 buf->p = realloc(buf->p, buf->size);
1642 }
1643 strncpy(buf->p + buf->pos, s, len);
1644 buf->pos += len;
1645 }
1646
1647 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1648 {
1649 const char *e = is_vmlinux(m) ?"":".ko";
1650
1651 switch (exp) {
1652 case export_gpl:
1653 fatal("modpost: GPL-incompatible module %s%s "
1654 "uses GPL-only symbol '%s'\n", m, e, s);
1655 break;
1656 case export_unused_gpl:
1657 fatal("modpost: GPL-incompatible module %s%s "
1658 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1659 break;
1660 case export_gpl_future:
1661 warn("modpost: GPL-incompatible module %s%s "
1662 "uses future GPL-only symbol '%s'\n", m, e, s);
1663 break;
1664 case export_plain:
1665 case export_unused:
1666 case export_unknown:
1667 /* ignore */
1668 break;
1669 }
1670 }
1671
1672 static void check_for_unused(enum export exp, const char *m, const char *s)
1673 {
1674 const char *e = is_vmlinux(m) ?"":".ko";
1675
1676 switch (exp) {
1677 case export_unused:
1678 case export_unused_gpl:
1679 warn("modpost: module %s%s "
1680 "uses symbol '%s' marked UNUSED\n", m, e, s);
1681 break;
1682 default:
1683 /* ignore */
1684 break;
1685 }
1686 }
1687
1688 static void check_exports(struct module *mod)
1689 {
1690 struct symbol *s, *exp;
1691
1692 for (s = mod->unres; s; s = s->next) {
1693 const char *basename;
1694 exp = find_symbol(s->name);
1695 if (!exp || exp->module == mod)
1696 continue;
1697 basename = strrchr(mod->name, '/');
1698 if (basename)
1699 basename++;
1700 else
1701 basename = mod->name;
1702 if (!mod->gpl_compatible)
1703 check_for_gpl_usage(exp->export, basename, exp->name);
1704 check_for_unused(exp->export, basename, exp->name);
1705 }
1706 }
1707
1708 /**
1709 * Header for the generated file
1710 **/
1711 static void add_header(struct buffer *b, struct module *mod)
1712 {
1713 buf_printf(b, "#include <linux/module.h>\n");
1714 buf_printf(b, "#include <linux/vermagic.h>\n");
1715 buf_printf(b, "#include <linux/compiler.h>\n");
1716 buf_printf(b, "\n");
1717 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1718 buf_printf(b, "\n");
1719 buf_printf(b, "struct module __this_module\n");
1720 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1721 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1722 if (mod->has_init)
1723 buf_printf(b, " .init = init_module,\n");
1724 if (mod->has_cleanup)
1725 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1726 " .exit = cleanup_module,\n"
1727 "#endif\n");
1728 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1729 buf_printf(b, "};\n");
1730 }
1731
1732 void add_staging_flag(struct buffer *b, const char *name)
1733 {
1734 static const char *staging_dir = "drivers/staging";
1735
1736 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1737 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1738 }
1739
1740 /**
1741 * Record CRCs for unresolved symbols
1742 **/
1743 static int add_versions(struct buffer *b, struct module *mod)
1744 {
1745 struct symbol *s, *exp;
1746 int err = 0;
1747
1748 for (s = mod->unres; s; s = s->next) {
1749 exp = find_symbol(s->name);
1750 if (!exp || exp->module == mod) {
1751 if (have_vmlinux && !s->weak) {
1752 if (warn_unresolved) {
1753 warn("\"%s\" [%s.ko] undefined!\n",
1754 s->name, mod->name);
1755 } else {
1756 merror("\"%s\" [%s.ko] undefined!\n",
1757 s->name, mod->name);
1758 err = 1;
1759 }
1760 }
1761 continue;
1762 }
1763 s->module = exp->module;
1764 s->crc_valid = exp->crc_valid;
1765 s->crc = exp->crc;
1766 }
1767
1768 if (!modversions)
1769 return err;
1770
1771 buf_printf(b, "\n");
1772 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1773 buf_printf(b, "__used\n");
1774 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1775
1776 for (s = mod->unres; s; s = s->next) {
1777 if (!s->module)
1778 continue;
1779 if (!s->crc_valid) {
1780 warn("\"%s\" [%s.ko] has no CRC!\n",
1781 s->name, mod->name);
1782 continue;
1783 }
1784 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1785 }
1786
1787 buf_printf(b, "};\n");
1788
1789 return err;
1790 }
1791
1792 static void add_depends(struct buffer *b, struct module *mod,
1793 struct module *modules)
1794 {
1795 struct symbol *s;
1796 struct module *m;
1797 int first = 1;
1798
1799 for (m = modules; m; m = m->next)
1800 m->seen = is_vmlinux(m->name);
1801
1802 buf_printf(b, "\n");
1803 buf_printf(b, "static const char __module_depends[]\n");
1804 buf_printf(b, "__used\n");
1805 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1806 buf_printf(b, "\"depends=");
1807 for (s = mod->unres; s; s = s->next) {
1808 const char *p;
1809 if (!s->module)
1810 continue;
1811
1812 if (s->module->seen)
1813 continue;
1814
1815 s->module->seen = 1;
1816 p = strrchr(s->module->name, '/');
1817 if (p)
1818 p++;
1819 else
1820 p = s->module->name;
1821 buf_printf(b, "%s%s", first ? "" : ",", p);
1822 first = 0;
1823 }
1824 buf_printf(b, "\";\n");
1825 }
1826
1827 static void add_srcversion(struct buffer *b, struct module *mod)
1828 {
1829 if (mod->srcversion[0]) {
1830 buf_printf(b, "\n");
1831 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1832 mod->srcversion);
1833 }
1834 }
1835
1836 static void write_if_changed(struct buffer *b, const char *fname)
1837 {
1838 char *tmp;
1839 FILE *file;
1840 struct stat st;
1841
1842 file = fopen(fname, "r");
1843 if (!file)
1844 goto write;
1845
1846 if (fstat(fileno(file), &st) < 0)
1847 goto close_write;
1848
1849 if (st.st_size != b->pos)
1850 goto close_write;
1851
1852 tmp = NOFAIL(malloc(b->pos));
1853 if (fread(tmp, 1, b->pos, file) != b->pos)
1854 goto free_write;
1855
1856 if (memcmp(tmp, b->p, b->pos) != 0)
1857 goto free_write;
1858
1859 free(tmp);
1860 fclose(file);
1861 return;
1862
1863 free_write:
1864 free(tmp);
1865 close_write:
1866 fclose(file);
1867 write:
1868 file = fopen(fname, "w");
1869 if (!file) {
1870 perror(fname);
1871 exit(1);
1872 }
1873 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1874 perror(fname);
1875 exit(1);
1876 }
1877 fclose(file);
1878 }
1879
1880 /* parse Module.symvers file. line format:
1881 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1882 **/
1883 static void read_dump(const char *fname, unsigned int kernel)
1884 {
1885 unsigned long size, pos = 0;
1886 void *file = grab_file(fname, &size);
1887 char *line;
1888
1889 if (!file)
1890 /* No symbol versions, silently ignore */
1891 return;
1892
1893 while ((line = get_next_line(&pos, file, size))) {
1894 char *symname, *modname, *d, *export, *end;
1895 unsigned int crc;
1896 struct module *mod;
1897 struct symbol *s;
1898
1899 if (!(symname = strchr(line, '\t')))
1900 goto fail;
1901 *symname++ = '\0';
1902 if (!(modname = strchr(symname, '\t')))
1903 goto fail;
1904 *modname++ = '\0';
1905 if ((export = strchr(modname, '\t')) != NULL)
1906 *export++ = '\0';
1907 if (export && ((end = strchr(export, '\t')) != NULL))
1908 *end = '\0';
1909 crc = strtoul(line, &d, 16);
1910 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1911 goto fail;
1912 mod = find_module(modname);
1913 if (!mod) {
1914 if (is_vmlinux(modname))
1915 have_vmlinux = 1;
1916 mod = new_module(NOFAIL(strdup(modname)));
1917 mod->skip = 1;
1918 }
1919 s = sym_add_exported(symname, mod, export_no(export));
1920 s->kernel = kernel;
1921 s->preloaded = 1;
1922 sym_update_crc(symname, mod, crc, export_no(export));
1923 }
1924 return;
1925 fail:
1926 fatal("parse error in symbol dump file\n");
1927 }
1928
1929 /* For normal builds always dump all symbols.
1930 * For external modules only dump symbols
1931 * that are not read from kernel Module.symvers.
1932 **/
1933 static int dump_sym(struct symbol *sym)
1934 {
1935 if (!external_module)
1936 return 1;
1937 if (sym->vmlinux || sym->kernel)
1938 return 0;
1939 return 1;
1940 }
1941
1942 static void write_dump(const char *fname)
1943 {
1944 struct buffer buf = { };
1945 struct symbol *symbol;
1946 int n;
1947
1948 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1949 symbol = symbolhash[n];
1950 while (symbol) {
1951 if (dump_sym(symbol))
1952 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1953 symbol->crc, symbol->name,
1954 symbol->module->name,
1955 export_str(symbol->export));
1956 symbol = symbol->next;
1957 }
1958 }
1959 write_if_changed(&buf, fname);
1960 }
1961
1962 static void add_marker(struct module *mod, const char *name, const char *fmt)
1963 {
1964 char *line = NULL;
1965 asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
1966 NOFAIL(line);
1967
1968 mod->markers = NOFAIL(realloc(mod->markers, ((mod->nmarkers + 1) *
1969 sizeof mod->markers[0])));
1970 mod->markers[mod->nmarkers++] = line;
1971 }
1972
1973 static void read_markers(const char *fname)
1974 {
1975 unsigned long size, pos = 0;
1976 void *file = grab_file(fname, &size);
1977 char *line;
1978
1979 if (!file) /* No old markers, silently ignore */
1980 return;
1981
1982 while ((line = get_next_line(&pos, file, size))) {
1983 char *marker, *modname, *fmt;
1984 struct module *mod;
1985
1986 marker = line;
1987 modname = strchr(marker, '\t');
1988 if (!modname)
1989 goto fail;
1990 *modname++ = '\0';
1991 fmt = strchr(modname, '\t');
1992 if (!fmt)
1993 goto fail;
1994 *fmt++ = '\0';
1995 if (*marker == '\0' || *modname == '\0')
1996 goto fail;
1997
1998 mod = find_module(modname);
1999 if (!mod) {
2000 mod = new_module(NOFAIL(strdup(modname)));
2001 mod->skip = 1;
2002 }
2003 if (is_vmlinux(modname)) {
2004 have_vmlinux = 1;
2005 mod->skip = 0;
2006 }
2007
2008 if (!mod->skip)
2009 add_marker(mod, marker, fmt);
2010 }
2011 release_file(file, size);
2012 return;
2013 fail:
2014 fatal("parse error in markers list file\n");
2015 }
2016
2017 static int compare_strings(const void *a, const void *b)
2018 {
2019 return strcmp(*(const char **) a, *(const char **) b);
2020 }
2021
2022 static void write_markers(const char *fname)
2023 {
2024 struct buffer buf = { };
2025 struct module *mod;
2026 size_t i;
2027
2028 for (mod = modules; mod; mod = mod->next)
2029 if ((!external_module || !mod->skip) && mod->markers != NULL) {
2030 /*
2031 * Sort the strings so we can skip duplicates when
2032 * we write them out.
2033 */
2034 qsort(mod->markers, mod->nmarkers,
2035 sizeof mod->markers[0], &compare_strings);
2036 for (i = 0; i < mod->nmarkers; ++i) {
2037 char *line = mod->markers[i];
2038 buf_write(&buf, line, strlen(line));
2039 while (i + 1 < mod->nmarkers &&
2040 !strcmp(mod->markers[i],
2041 mod->markers[i + 1]))
2042 free(mod->markers[i++]);
2043 free(mod->markers[i]);
2044 }
2045 free(mod->markers);
2046 mod->markers = NULL;
2047 }
2048
2049 write_if_changed(&buf, fname);
2050 }
2051
2052 struct ext_sym_list {
2053 struct ext_sym_list *next;
2054 const char *file;
2055 };
2056
2057 int main(int argc, char **argv)
2058 {
2059 struct module *mod;
2060 struct buffer buf = { };
2061 char *kernel_read = NULL, *module_read = NULL;
2062 char *dump_write = NULL;
2063 char *markers_read = NULL;
2064 char *markers_write = NULL;
2065 int opt;
2066 int err;
2067 struct ext_sym_list *extsym_iter;
2068 struct ext_sym_list *extsym_start = NULL;
2069
2070 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2071 switch (opt) {
2072 case 'i':
2073 kernel_read = optarg;
2074 break;
2075 case 'I':
2076 module_read = optarg;
2077 external_module = 1;
2078 break;
2079 case 'c':
2080 cross_build = 1;
2081 break;
2082 case 'e':
2083 external_module = 1;
2084 extsym_iter =
2085 NOFAIL(malloc(sizeof(*extsym_iter)));
2086 extsym_iter->next = extsym_start;
2087 extsym_iter->file = optarg;
2088 extsym_start = extsym_iter;
2089 break;
2090 case 'm':
2091 modversions = 1;
2092 break;
2093 case 'o':
2094 dump_write = optarg;
2095 break;
2096 case 'a':
2097 all_versions = 1;
2098 break;
2099 case 's':
2100 vmlinux_section_warnings = 0;
2101 break;
2102 case 'S':
2103 sec_mismatch_verbose = 0;
2104 break;
2105 case 'w':
2106 warn_unresolved = 1;
2107 break;
2108 case 'M':
2109 markers_write = optarg;
2110 break;
2111 case 'K':
2112 markers_read = optarg;
2113 break;
2114 default:
2115 exit(1);
2116 }
2117 }
2118
2119 if (kernel_read)
2120 read_dump(kernel_read, 1);
2121 if (module_read)
2122 read_dump(module_read, 0);
2123 while (extsym_start) {
2124 read_dump(extsym_start->file, 0);
2125 extsym_iter = extsym_start->next;
2126 free(extsym_start);
2127 extsym_start = extsym_iter;
2128 }
2129
2130 while (optind < argc)
2131 read_symbols(argv[optind++]);
2132
2133 for (mod = modules; mod; mod = mod->next) {
2134 if (mod->skip)
2135 continue;
2136 check_exports(mod);
2137 }
2138
2139 err = 0;
2140
2141 for (mod = modules; mod; mod = mod->next) {
2142 char fname[strlen(mod->name) + 10];
2143
2144 if (mod->skip)
2145 continue;
2146
2147 buf.pos = 0;
2148
2149 add_header(&buf, mod);
2150 add_staging_flag(&buf, mod->name);
2151 err |= add_versions(&buf, mod);
2152 add_depends(&buf, mod, modules);
2153 add_moddevtable(&buf, mod);
2154 add_srcversion(&buf, mod);
2155
2156 sprintf(fname, "%s.mod.c", mod->name);
2157 write_if_changed(&buf, fname);
2158 }
2159
2160 if (dump_write)
2161 write_dump(dump_write);
2162 if (sec_mismatch_count && !sec_mismatch_verbose)
2163 warn("modpost: Found %d section mismatch(es).\n"
2164 "To see full details build your kernel with:\n"
2165 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2166 sec_mismatch_count);
2167
2168 if (markers_read)
2169 read_markers(markers_read);
2170
2171 if (markers_write)
2172 write_markers(markers_write);
2173
2174 return err;
2175 }
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK