?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
knfsd: nfsd4: simplify exp_pseudoroot arguments
[wrt350n-kernel.git] / scripts / mod / modpost.c
blob3645e980da717e018afa6cdab248358a29ebcbe0
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006 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 #include <ctype.h>
15 #include "modpost.h"
16 #include "../../include/linux/license.h"
17
18 /* Are we using CONFIG_MODVERSIONS? */
19 int modversions = 0;
20 /* Warn about undefined symbols? (do so if we have vmlinux) */
21 int have_vmlinux = 0;
22 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
23 static int all_versions = 0;
24 /* If we are modposting external module set to 1 */
25 static int external_module = 0;
26 /* Only warn about unresolved symbols */
27 static int warn_unresolved = 0;
28 /* How a symbol is exported */
29 enum export {
30 export_plain, export_unused, export_gpl,
31 export_unused_gpl, export_gpl_future, export_unknown
32 };
33
34 void fatal(const char *fmt, ...)
35 {
36 va_list arglist;
37
38 fprintf(stderr, "FATAL: ");
39
40 va_start(arglist, fmt);
41 vfprintf(stderr, fmt, arglist);
42 va_end(arglist);
43
44 exit(1);
45 }
46
47 void warn(const char *fmt, ...)
48 {
49 va_list arglist;
50
51 fprintf(stderr, "WARNING: ");
52
53 va_start(arglist, fmt);
54 vfprintf(stderr, fmt, arglist);
55 va_end(arglist);
56 }
57
58 void merror(const char *fmt, ...)
59 {
60 va_list arglist;
61
62 fprintf(stderr, "ERROR: ");
63
64 va_start(arglist, fmt);
65 vfprintf(stderr, fmt, arglist);
66 va_end(arglist);
67 }
68
69 static int is_vmlinux(const char *modname)
70 {
71 const char *myname;
72
73 if ((myname = strrchr(modname, '/')))
74 myname++;
75 else
76 myname = modname;
77
78 return strcmp(myname, "vmlinux") == 0;
79 }
80
81 void *do_nofail(void *ptr, const char *expr)
82 {
83 if (!ptr) {
84 fatal("modpost: Memory allocation failure: %s.\n", expr);
85 }
86 return ptr;
87 }
88
89 /* A list of all modules we processed */
90
91 static struct module *modules;
92
93 static struct module *find_module(char *modname)
94 {
95 struct module *mod;
96
97 for (mod = modules; mod; mod = mod->next)
98 if (strcmp(mod->name, modname) == 0)
99 break;
100 return mod;
101 }
102
103 static struct module *new_module(char *modname)
104 {
105 struct module *mod;
106 char *p, *s;
107
108 mod = NOFAIL(malloc(sizeof(*mod)));
109 memset(mod, 0, sizeof(*mod));
110 p = NOFAIL(strdup(modname));
111
112 /* strip trailing .o */
113 if ((s = strrchr(p, '.')) != NULL)
114 if (strcmp(s, ".o") == 0)
115 *s = '\0';
116
117 /* add to list */
118 mod->name = p;
119 mod->gpl_compatible = -1;
120 mod->next = modules;
121 modules = mod;
122
123 return mod;
124 }
125
126 /* A hash of all exported symbols,
127 * struct symbol is also used for lists of unresolved symbols */
128
129 #define SYMBOL_HASH_SIZE 1024
130
131 struct symbol {
132 struct symbol *next;
133 struct module *module;
134 unsigned int crc;
135 int crc_valid;
136 unsigned int weak:1;
137 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
138 unsigned int kernel:1; /* 1 if symbol is from kernel
139 * (only for external modules) **/
140 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
141 enum export export; /* Type of export */
142 char name[0];
143 };
144
145 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
146
147 /* This is based on the hash agorithm from gdbm, via tdb */
148 static inline unsigned int tdb_hash(const char *name)
149 {
150 unsigned value; /* Used to compute the hash value. */
151 unsigned i; /* Used to cycle through random values. */
152
153 /* Set the initial value from the key size. */
154 for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
155 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
156
157 return (1103515243 * value + 12345);
158 }
159
160 /**
161 * Allocate a new symbols for use in the hash of exported symbols or
162 * the list of unresolved symbols per module
163 **/
164 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
165 struct symbol *next)
166 {
167 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
168
169 memset(s, 0, sizeof(*s));
170 strcpy(s->name, name);
171 s->weak = weak;
172 s->next = next;
173 return s;
174 }
175
176 /* For the hash of exported symbols */
177 static struct symbol *new_symbol(const char *name, struct module *module,
178 enum export export)
179 {
180 unsigned int hash;
181 struct symbol *new;
182
183 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
184 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
185 new->module = module;
186 new->export = export;
187 return new;
188 }
189
190 static struct symbol *find_symbol(const char *name)
191 {
192 struct symbol *s;
193
194 /* For our purposes, .foo matches foo. PPC64 needs this. */
195 if (name[0] == '.')
196 name++;
197
198 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) {
199 if (strcmp(s->name, name) == 0)
200 return s;
201 }
202 return NULL;
203 }
204
205 static struct {
206 const char *str;
207 enum export export;
208 } export_list[] = {
209 { .str = "EXPORT_SYMBOL", .export = export_plain },
210 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
211 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
212 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
213 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
214 { .str = "(unknown)", .export = export_unknown },
215 };
216
217
218 static const char *export_str(enum export ex)
219 {
220 return export_list[ex].str;
221 }
222
223 static enum export export_no(const char * s)
224 {
225 int i;
226 if (!s)
227 return export_unknown;
228 for (i = 0; export_list[i].export != export_unknown; i++) {
229 if (strcmp(export_list[i].str, s) == 0)
230 return export_list[i].export;
231 }
232 return export_unknown;
233 }
234
235 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
236 {
237 if (sec == elf->export_sec)
238 return export_plain;
239 else if (sec == elf->export_unused_sec)
240 return export_unused;
241 else if (sec == elf->export_gpl_sec)
242 return export_gpl;
243 else if (sec == elf->export_unused_gpl_sec)
244 return export_unused_gpl;
245 else if (sec == elf->export_gpl_future_sec)
246 return export_gpl_future;
247 else
248 return export_unknown;
249 }
250
251 /**
252 * Add an exported symbol - it may have already been added without a
253 * CRC, in this case just update the CRC
254 **/
255 static struct symbol *sym_add_exported(const char *name, struct module *mod,
256 enum export export)
257 {
258 struct symbol *s = find_symbol(name);
259
260 if (!s) {
261 s = new_symbol(name, mod, export);
262 } else {
263 if (!s->preloaded) {
264 warn("%s: '%s' exported twice. Previous export "
265 "was in %s%s\n", mod->name, name,
266 s->module->name,
267 is_vmlinux(s->module->name) ?"":".ko");
268 }
269 }
270 s->preloaded = 0;
271 s->vmlinux = is_vmlinux(mod->name);
272 s->kernel = 0;
273 s->export = export;
274 return s;
275 }
276
277 static void sym_update_crc(const char *name, struct module *mod,
278 unsigned int crc, enum export export)
279 {
280 struct symbol *s = find_symbol(name);
281
282 if (!s)
283 s = new_symbol(name, mod, export);
284 s->crc = crc;
285 s->crc_valid = 1;
286 }
287
288 void *grab_file(const char *filename, unsigned long *size)
289 {
290 struct stat st;
291 void *map;
292 int fd;
293
294 fd = open(filename, O_RDONLY);
295 if (fd < 0 || fstat(fd, &st) != 0)
296 return NULL;
297
298 *size = st.st_size;
299 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
300 close(fd);
301
302 if (map == MAP_FAILED)
303 return NULL;
304 return map;
305 }
306
307 /**
308 * Return a copy of the next line in a mmap'ed file.
309 * spaces in the beginning of the line is trimmed away.
310 * Return a pointer to a static buffer.
311 **/
312 char* get_next_line(unsigned long *pos, void *file, unsigned long size)
313 {
314 static char line[4096];
315 int skip = 1;
316 size_t len = 0;
317 signed char *p = (signed char *)file + *pos;
318 char *s = line;
319
320 for (; *pos < size ; (*pos)++)
321 {
322 if (skip && isspace(*p)) {
323 p++;
324 continue;
325 }
326 skip = 0;
327 if (*p != '\n' && (*pos < size)) {
328 len++;
329 *s++ = *p++;
330 if (len > 4095)
331 break; /* Too long, stop */
332 } else {
333 /* End of string */
334 *s = '\0';
335 return line;
336 }
337 }
338 /* End of buffer */
339 return NULL;
340 }
341
342 void release_file(void *file, unsigned long size)
343 {
344 munmap(file, size);
345 }
346
347 static int parse_elf(struct elf_info *info, const char *filename)
348 {
349 unsigned int i;
350 Elf_Ehdr *hdr;
351 Elf_Shdr *sechdrs;
352 Elf_Sym *sym;
353
354 hdr = grab_file(filename, &info->size);
355 if (!hdr) {
356 perror(filename);
357 exit(1);
358 }
359 info->hdr = hdr;
360 if (info->size < sizeof(*hdr)) {
361 /* file too small, assume this is an empty .o file */
362 return 0;
363 }
364 /* Is this a valid ELF file? */
365 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
366 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
367 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
368 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
369 /* Not an ELF file - silently ignore it */
370 return 0;
371 }
372 /* Fix endianness in ELF header */
373 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
374 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
375 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
376 hdr->e_machine = TO_NATIVE(hdr->e_machine);
377 sechdrs = (void *)hdr + hdr->e_shoff;
378 info->sechdrs = sechdrs;
379
380 /* Fix endianness in section headers */
381 for (i = 0; i < hdr->e_shnum; i++) {
382 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
383 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
384 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
385 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
386 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
387 }
388 /* Find symbol table. */
389 for (i = 1; i < hdr->e_shnum; i++) {
390 const char *secstrings
391 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
392 const char *secname;
393
394 if (sechdrs[i].sh_offset > info->size) {
395 fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
396 return 0;
397 }
398 secname = secstrings + sechdrs[i].sh_name;
399 if (strcmp(secname, ".modinfo") == 0) {
400 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
401 info->modinfo_len = sechdrs[i].sh_size;
402 } else if (strcmp(secname, "__ksymtab") == 0)
403 info->export_sec = i;
404 else if (strcmp(secname, "__ksymtab_unused") == 0)
405 info->export_unused_sec = i;
406 else if (strcmp(secname, "__ksymtab_gpl") == 0)
407 info->export_gpl_sec = i;
408 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
409 info->export_unused_gpl_sec = i;
410 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
411 info->export_gpl_future_sec = i;
412
413 if (sechdrs[i].sh_type != SHT_SYMTAB)
414 continue;
415
416 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
417 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
418 + sechdrs[i].sh_size;
419 info->strtab = (void *)hdr +
420 sechdrs[sechdrs[i].sh_link].sh_offset;
421 }
422 if (!info->symtab_start) {
423 fatal("%s has no symtab?\n", filename);
424 }
425 /* Fix endianness in symbols */
426 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
427 sym->st_shndx = TO_NATIVE(sym->st_shndx);
428 sym->st_name = TO_NATIVE(sym->st_name);
429 sym->st_value = TO_NATIVE(sym->st_value);
430 sym->st_size = TO_NATIVE(sym->st_size);
431 }
432 return 1;
433 }
434
435 static void parse_elf_finish(struct elf_info *info)
436 {
437 release_file(info->hdr, info->size);
438 }
439
440 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
441 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
442
443 static void handle_modversions(struct module *mod, struct elf_info *info,
444 Elf_Sym *sym, const char *symname)
445 {
446 unsigned int crc;
447 enum export export = export_from_sec(info, sym->st_shndx);
448
449 switch (sym->st_shndx) {
450 case SHN_COMMON:
451 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
452 break;
453 case SHN_ABS:
454 /* CRC'd symbol */
455 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
456 crc = (unsigned int) sym->st_value;
457 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
458 export);
459 }
460 break;
461 case SHN_UNDEF:
462 /* undefined symbol */
463 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
464 ELF_ST_BIND(sym->st_info) != STB_WEAK)
465 break;
466 /* ignore global offset table */
467 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
468 break;
469 /* ignore __this_module, it will be resolved shortly */
470 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
471 break;
472 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
473 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
474 /* add compatibility with older glibc */
475 #ifndef STT_SPARC_REGISTER
476 #define STT_SPARC_REGISTER STT_REGISTER
477 #endif
478 if (info->hdr->e_machine == EM_SPARC ||
479 info->hdr->e_machine == EM_SPARCV9) {
480 /* Ignore register directives. */
481 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
482 break;
483 if (symname[0] == '.') {
484 char *munged = strdup(symname);
485 munged[0] = '_';
486 munged[1] = toupper(munged[1]);
487 symname = munged;
488 }
489 }
490 #endif
491
492 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
493 strlen(MODULE_SYMBOL_PREFIX)) == 0)
494 mod->unres = alloc_symbol(symname +
495 strlen(MODULE_SYMBOL_PREFIX),
496 ELF_ST_BIND(sym->st_info) == STB_WEAK,
497 mod->unres);
498 break;
499 default:
500 /* All exported symbols */
501 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
502 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
503 export);
504 }
505 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
506 mod->has_init = 1;
507 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
508 mod->has_cleanup = 1;
509 break;
510 }
511 }
512
513 /**
514 * Parse tag=value strings from .modinfo section
515 **/
516 static char *next_string(char *string, unsigned long *secsize)
517 {
518 /* Skip non-zero chars */
519 while (string[0]) {
520 string++;
521 if ((*secsize)-- <= 1)
522 return NULL;
523 }
524
525 /* Skip any zero padding. */
526 while (!string[0]) {
527 string++;
528 if ((*secsize)-- <= 1)
529 return NULL;
530 }
531 return string;
532 }
533
534 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
535 const char *tag, char *info)
536 {
537 char *p;
538 unsigned int taglen = strlen(tag);
539 unsigned long size = modinfo_len;
540
541 if (info) {
542 size -= info - (char *)modinfo;
543 modinfo = next_string(info, &size);
544 }
545
546 for (p = modinfo; p; p = next_string(p, &size)) {
547 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
548 return p + taglen + 1;
549 }
550 return NULL;
551 }
552
553 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
554 const char *tag)
555
556 {
557 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
558 }
559
560 /**
561 * Test if string s ends in string sub
562 * return 0 if match
563 **/
564 static int strrcmp(const char *s, const char *sub)
565 {
566 int slen, sublen;
567
568 if (!s || !sub)
569 return 1;
570
571 slen = strlen(s);
572 sublen = strlen(sub);
573
574 if ((slen == 0) || (sublen == 0))
575 return 1;
576
577 if (sublen > slen)
578 return 1;
579
580 return memcmp(s + slen - sublen, sub, sublen);
581 }
582
583 /**
584 * Whitelist to allow certain references to pass with no warning.
585 *
586 * Pattern 0:
587 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
588 * The pattern is identified by:
589 * fromsec = .text.init.refok | .data.init.refok
590 *
591 * Pattern 1:
592 * If a module parameter is declared __initdata and permissions=0
593 * then this is legal despite the warning generated.
594 * We cannot see value of permissions here, so just ignore
595 * this pattern.
596 * The pattern is identified by:
597 * tosec = .init.data
598 * fromsec = .data*
599 * atsym =__param*
600 *
601 * Pattern 2:
602 * Many drivers utilise a *driver container with references to
603 * add, remove, probe functions etc.
604 * These functions may often be marked __init and we do not want to
605 * warn here.
606 * the pattern is identified by:
607 * tosec = .init.text | .exit.text | .init.data
608 * fromsec = .data
609 * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console
610 *
611 * Pattern 3:
612 * Whitelist all references from .pci_fixup* section to .init.text
613 * This is part of the PCI init when built-in
614 *
615 * Pattern 4:
616 * Whitelist all refereces from .text.head to .init.data
617 * Whitelist all refereces from .text.head to .init.text
618 *
619 * Pattern 5:
620 * Some symbols belong to init section but still it is ok to reference
621 * these from non-init sections as these symbols don't have any memory
622 * allocated for them and symbol address and value are same. So even
623 * if init section is freed, its ok to reference those symbols.
624 * For ex. symbols marking the init section boundaries.
625 * This pattern is identified by
626 * refsymname = __init_begin, _sinittext, _einittext
627 *
628 * Pattern 7:
629 * Logos used in drivers/video/logo reside in __initdata but the
630 * funtion that references them are EXPORT_SYMBOL() so cannot be
631 * marker __init. So we whitelist them here.
632 * The pattern is:
633 * tosec = .init.data
634 * fromsec = .text*
635 * refsymname = logo_
636 *
637 * Pattern 8:
638 * Symbols contained in .paravirtprobe may safely reference .init.text.
639 * The pattern is:
640 * tosec = .init.text
641 * fromsec = .paravirtprobe
642 *
643 * Pattern 10:
644 * ia64 has machvec table for each platform and
645 * powerpc has a machine desc table for each platform.
646 * It is mixture of function pointers of .init.text and .text.
647 * fromsec = .machvec | .machine.desc
648 **/
649 static int secref_whitelist(const char *modname, const char *tosec,
650 const char *fromsec, const char *atsym,
651 const char *refsymname)
652 {
653 int f1 = 1, f2 = 1;
654 const char **s;
655 const char *pat2sym[] = {
656 "driver",
657 "_template", /* scsi uses *_template a lot */
658 "_sht", /* scsi also used *_sht to some extent */
659 "_ops",
660 "_probe",
661 "_probe_one",
662 "_console",
663 "apic_es7000",
664 NULL
665 };
666
667 const char *pat3refsym[] = {
668 "__init_begin",
669 "_sinittext",
670 "_einittext",
671 NULL
672 };
673
674 /* Check for pattern 0 */
675 if ((strcmp(fromsec, ".text.init.refok") == 0) ||
676 (strcmp(fromsec, ".data.init.refok") == 0))
677 return 1;
678
679 /* Check for pattern 1 */
680 if (strcmp(tosec, ".init.data") != 0)
681 f1 = 0;
682 if (strncmp(fromsec, ".data", strlen(".data")) != 0)
683 f1 = 0;
684 if (strncmp(atsym, "__param", strlen("__param")) != 0)
685 f1 = 0;
686
687 if (f1)
688 return f1;
689
690 /* Check for pattern 2 */
691 if ((strcmp(tosec, ".init.text") != 0) &&
692 (strcmp(tosec, ".exit.text") != 0) &&
693 (strcmp(tosec, ".init.data") != 0))
694 f2 = 0;
695 if (strcmp(fromsec, ".data") != 0)
696 f2 = 0;
697
698 for (s = pat2sym; *s; s++)
699 if (strrcmp(atsym, *s) == 0)
700 f1 = 1;
701 if (f1 && f2)
702 return 1;
703
704 /* Check for pattern 3 */
705 if ((strncmp(fromsec, ".pci_fixup", strlen(".pci_fixup")) == 0) &&
706 (strcmp(tosec, ".init.text") == 0))
707 return 1;
708
709 /* Check for pattern 4 */
710 if ((strcmp(fromsec, ".text.head") == 0) &&
711 ((strcmp(tosec, ".init.data") == 0) ||
712 (strcmp(tosec, ".init.text") == 0)))
713 return 1;
714
715 /* Check for pattern 5 */
716 for (s = pat3refsym; *s; s++)
717 if (strcmp(refsymname, *s) == 0)
718 return 1;
719
720 /* Check for pattern 7 */
721 if ((strcmp(tosec, ".init.data") == 0) &&
722 (strncmp(fromsec, ".text", strlen(".text")) == 0) &&
723 (strncmp(refsymname, "logo_", strlen("logo_")) == 0))
724 return 1;
725
726 /* Check for pattern 8 */
727 if ((strcmp(tosec, ".init.text") == 0) &&
728 (strcmp(fromsec, ".paravirtprobe") == 0))
729 return 1;
730
731 /* Check for pattern 10 */
732 if ((strcmp(fromsec, ".machvec") == 0) ||
733 (strcmp(fromsec, ".machine.desc") == 0))
734 return 1;
735
736 return 0;
737 }
738
739 /**
740 * Find symbol based on relocation record info.
741 * In some cases the symbol supplied is a valid symbol so
742 * return refsym. If st_name != 0 we assume this is a valid symbol.
743 * In other cases the symbol needs to be looked up in the symbol table
744 * based on section and address.
745 * **/
746 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
747 Elf_Sym *relsym)
748 {
749 Elf_Sym *sym;
750
751 if (relsym->st_name != 0)
752 return relsym;
753 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
754 if (sym->st_shndx != relsym->st_shndx)
755 continue;
756 if (sym->st_value == addr)
757 return sym;
758 }
759 return NULL;
760 }
761
762 static inline int is_arm_mapping_symbol(const char *str)
763 {
764 return str[0] == '$' && strchr("atd", str[1])
765 && (str[2] == '\0' || str[2] == '.');
766 }
767
768 /*
769 * If there's no name there, ignore it; likewise, ignore it if it's
770 * one of the magic symbols emitted used by current ARM tools.
771 *
772 * Otherwise if find_symbols_between() returns those symbols, they'll
773 * fail the whitelist tests and cause lots of false alarms ... fixable
774 * only by merging __exit and __init sections into __text, bloating
775 * the kernel (which is especially evil on embedded platforms).
776 */
777 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
778 {
779 const char *name = elf->strtab + sym->st_name;
780
781 if (!name || !strlen(name))
782 return 0;
783 return !is_arm_mapping_symbol(name);
784 }
785
786 /*
787 * Find symbols before or equal addr and after addr - in the section sec.
788 * If we find two symbols with equal offset prefer one with a valid name.
789 * The ELF format may have a better way to detect what type of symbol
790 * it is, but this works for now.
791 **/
792 static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
793 const char *sec,
794 Elf_Sym **before, Elf_Sym **after)
795 {
796 Elf_Sym *sym;
797 Elf_Ehdr *hdr = elf->hdr;
798 Elf_Addr beforediff = ~0;
799 Elf_Addr afterdiff = ~0;
800 const char *secstrings = (void *)hdr +
801 elf->sechdrs[hdr->e_shstrndx].sh_offset;
802
803 *before = NULL;
804 *after = NULL;
805
806 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
807 const char *symsec;
808
809 if (sym->st_shndx >= SHN_LORESERVE)
810 continue;
811 symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
812 if (strcmp(symsec, sec) != 0)
813 continue;
814 if (!is_valid_name(elf, sym))
815 continue;
816 if (sym->st_value <= addr) {
817 if ((addr - sym->st_value) < beforediff) {
818 beforediff = addr - sym->st_value;
819 *before = sym;
820 }
821 else if ((addr - sym->st_value) == beforediff) {
822 *before = sym;
823 }
824 }
825 else
826 {
827 if ((sym->st_value - addr) < afterdiff) {
828 afterdiff = sym->st_value - addr;
829 *after = sym;
830 }
831 else if ((sym->st_value - addr) == afterdiff) {
832 *after = sym;
833 }
834 }
835 }
836 }
837
838 /**
839 * Print a warning about a section mismatch.
840 * Try to find symbols near it so user can find it.
841 * Check whitelist before warning - it may be a false positive.
842 **/
843 static void warn_sec_mismatch(const char *modname, const char *fromsec,
844 struct elf_info *elf, Elf_Sym *sym, Elf_Rela r)
845 {
846 const char *refsymname = "";
847 Elf_Sym *before, *after;
848 Elf_Sym *refsym;
849 Elf_Ehdr *hdr = elf->hdr;
850 Elf_Shdr *sechdrs = elf->sechdrs;
851 const char *secstrings = (void *)hdr +
852 sechdrs[hdr->e_shstrndx].sh_offset;
853 const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name;
854
855 find_symbols_between(elf, r.r_offset, fromsec, &before, &after);
856
857 refsym = find_elf_symbol(elf, r.r_addend, sym);
858 if (refsym && strlen(elf->strtab + refsym->st_name))
859 refsymname = elf->strtab + refsym->st_name;
860
861 /* check whitelist - we may ignore it */
862 if (before &&
863 secref_whitelist(modname, secname, fromsec,
864 elf->strtab + before->st_name, refsymname))
865 return;
866
867 /* fromsec whitelist - without a valid 'before'
868 * powerpc has a GOT table in .got2 section */
869 if (strcmp(fromsec, ".got2") == 0)
870 return;
871
872 if (before && after) {
873 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
874 "(between '%s' and '%s')\n",
875 modname, fromsec, (unsigned long long)r.r_offset,
876 secname, refsymname,
877 elf->strtab + before->st_name,
878 elf->strtab + after->st_name);
879 } else if (before) {
880 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
881 "(after '%s')\n",
882 modname, fromsec, (unsigned long long)r.r_offset,
883 secname, refsymname,
884 elf->strtab + before->st_name);
885 } else if (after) {
886 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
887 "before '%s' (at offset -0x%llx)\n",
888 modname, fromsec, (unsigned long long)r.r_offset,
889 secname, refsymname,
890 elf->strtab + after->st_name);
891 } else {
892 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
893 modname, fromsec, (unsigned long long)r.r_offset,
894 secname, refsymname);
895 }
896 }
897
898 /**
899 * A module includes a number of sections that are discarded
900 * either when loaded or when used as built-in.
901 * For loaded modules all functions marked __init and all data
902 * marked __initdata will be discarded when the module has been intialized.
903 * Likewise for modules used built-in the sections marked __exit
904 * are discarded because __exit marked function are supposed to be called
905 * only when a moduel is unloaded which never happes for built-in modules.
906 * The check_sec_ref() function traverses all relocation records
907 * to find all references to a section that reference a section that will
908 * be discarded and warns about it.
909 **/
910 static void check_sec_ref(struct module *mod, const char *modname,
911 struct elf_info *elf,
912 int section(const char*),
913 int section_ref_ok(const char *))
914 {
915 int i;
916 Elf_Sym *sym;
917 Elf_Ehdr *hdr = elf->hdr;
918 Elf_Shdr *sechdrs = elf->sechdrs;
919 const char *secstrings = (void *)hdr +
920 sechdrs[hdr->e_shstrndx].sh_offset;
921
922 /* Walk through all sections */
923 for (i = 0; i < hdr->e_shnum; i++) {
924 const char *name = secstrings + sechdrs[i].sh_name;
925 const char *secname;
926 Elf_Rela r;
927 unsigned int r_sym;
928 /* We want to process only relocation sections and not .init */
929 if (sechdrs[i].sh_type == SHT_RELA) {
930 Elf_Rela *rela;
931 Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
932 Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
933 name += strlen(".rela");
934 if (section_ref_ok(name))
935 continue;
936
937 for (rela = start; rela < stop; rela++) {
938 r.r_offset = TO_NATIVE(rela->r_offset);
939 #if KERNEL_ELFCLASS == ELFCLASS64
940 if (hdr->e_machine == EM_MIPS) {
941 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
942 r_sym = TO_NATIVE(r_sym);
943 } else {
944 r.r_info = TO_NATIVE(rela->r_info);
945 r_sym = ELF_R_SYM(r.r_info);
946 }
947 #else
948 r.r_info = TO_NATIVE(rela->r_info);
949 r_sym = ELF_R_SYM(r.r_info);
950 #endif
951 r.r_addend = TO_NATIVE(rela->r_addend);
952 sym = elf->symtab_start + r_sym;
953 /* Skip special sections */
954 if (sym->st_shndx >= SHN_LORESERVE)
955 continue;
956
957 secname = secstrings +
958 sechdrs[sym->st_shndx].sh_name;
959 if (section(secname))
960 warn_sec_mismatch(modname, name,
961 elf, sym, r);
962 }
963 } else if (sechdrs[i].sh_type == SHT_REL) {
964 Elf_Rel *rel;
965 Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
966 Elf_Rel *stop = (void*)start + sechdrs[i].sh_size;
967 name += strlen(".rel");
968 if (section_ref_ok(name))
969 continue;
970
971 for (rel = start; rel < stop; rel++) {
972 r.r_offset = TO_NATIVE(rel->r_offset);
973 #if KERNEL_ELFCLASS == ELFCLASS64
974 if (hdr->e_machine == EM_MIPS) {
975 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
976 r_sym = TO_NATIVE(r_sym);
977 } else {
978 r.r_info = TO_NATIVE(rel->r_info);
979 r_sym = ELF_R_SYM(r.r_info);
980 }
981 #else
982 r.r_info = TO_NATIVE(rel->r_info);
983 r_sym = ELF_R_SYM(r.r_info);
984 #endif
985 r.r_addend = 0;
986 sym = elf->symtab_start + r_sym;
987 /* Skip special sections */
988 if (sym->st_shndx >= SHN_LORESERVE)
989 continue;
990
991 secname = secstrings +
992 sechdrs[sym->st_shndx].sh_name;
993 if (section(secname))
994 warn_sec_mismatch(modname, name,
995 elf, sym, r);
996 }
997 }
998 }
999 }
1000
1001 /**
1002 * Functions used only during module init is marked __init and is stored in
1003 * a .init.text section. Likewise data is marked __initdata and stored in
1004 * a .init.data section.
1005 * If this section is one of these sections return 1
1006 * See include/linux/init.h for the details
1007 **/
1008 static int init_section(const char *name)
1009 {
1010 if (strcmp(name, ".init") == 0)
1011 return 1;
1012 if (strncmp(name, ".init.", strlen(".init.")) == 0)
1013 return 1;
1014 return 0;
1015 }
1016
1017 /**
1018 * Identify sections from which references to a .init section is OK.
1019 *
1020 * Unfortunately references to read only data that referenced .init
1021 * sections had to be excluded. Almost all of these are false
1022 * positives, they are created by gcc. The downside of excluding rodata
1023 * is that there really are some user references from rodata to
1024 * init code, e.g. drivers/video/vgacon.c:
1025 *
1026 * const struct consw vga_con = {
1027 * con_startup: vgacon_startup,
1028 *
1029 * where vgacon_startup is __init. If you want to wade through the false
1030 * positives, take out the check for rodata.
1031 **/
1032 static int init_section_ref_ok(const char *name)
1033 {
1034 const char **s;
1035 /* Absolute section names */
1036 const char *namelist1[] = {
1037 ".init",
1038 ".opd", /* see comment [OPD] at exit_section_ref_ok() */
1039 ".toc1", /* used by ppc64 */
1040 ".stab",
1041 ".data.rel.ro", /* used by parisc64 */
1042 ".parainstructions",
1043 ".text.lock",
1044 "__bug_table", /* used by powerpc for BUG() */
1045 ".pci_fixup_header",
1046 ".pci_fixup_final",
1047 ".pdr",
1048 "__param",
1049 "__ex_table",
1050 ".fixup",
1051 ".smp_locks",
1052 ".plt", /* seen on ARCH=um build on x86_64. Harmless */
1053 "__ftr_fixup", /* powerpc cpu feature fixup */
1054 "__fw_ftr_fixup", /* powerpc firmware feature fixup */
1055 ".cranges", /* used by sh64 */
1056 NULL
1057 };
1058 /* Start of section names */
1059 const char *namelist2[] = {
1060 ".init.",
1061 ".altinstructions",
1062 ".eh_frame",
1063 ".debug",
1064 ".parainstructions",
1065 ".rodata",
1066 NULL
1067 };
1068 /* part of section name */
1069 const char *namelist3 [] = {
1070 ".unwind", /* sample: IA_64.unwind.init.text */
1071 NULL
1072 };
1073
1074 for (s = namelist1; *s; s++)
1075 if (strcmp(*s, name) == 0)
1076 return 1;
1077 for (s = namelist2; *s; s++)
1078 if (strncmp(*s, name, strlen(*s)) == 0)
1079 return 1;
1080 for (s = namelist3; *s; s++)
1081 if (strstr(name, *s) != NULL)
1082 return 1;
1083 if (strrcmp(name, ".init") == 0)
1084 return 1;
1085 return 0;
1086 }
1087
1088 /*
1089 * Functions used only during module exit is marked __exit and is stored in
1090 * a .exit.text section. Likewise data is marked __exitdata and stored in
1091 * a .exit.data section.
1092 * If this section is one of these sections return 1
1093 * See include/linux/init.h for the details
1094 **/
1095 static int exit_section(const char *name)
1096 {
1097 if (strcmp(name, ".exit.text") == 0)
1098 return 1;
1099 if (strcmp(name, ".exit.data") == 0)
1100 return 1;
1101 return 0;
1102
1103 }
1104
1105 /*
1106 * Identify sections from which references to a .exit section is OK.
1107 *
1108 * [OPD] Keith Ownes <kaos@sgi.com> commented:
1109 * For our future {in}sanity, add a comment that this is the ppc .opd
1110 * section, not the ia64 .opd section.
1111 * ia64 .opd should not point to discarded sections.
1112 * [.rodata] like for .init.text we ignore .rodata references -same reason
1113 **/
1114 static int exit_section_ref_ok(const char *name)
1115 {
1116 const char **s;
1117 /* Absolute section names */
1118 const char *namelist1[] = {
1119 ".exit.text",
1120 ".exit.data",
1121 ".init.text",
1122 ".rodata",
1123 ".opd", /* See comment [OPD] */
1124 ".toc1", /* used by ppc64 */
1125 ".altinstructions",
1126 ".pdr",
1127 "__bug_table", /* used by powerpc for BUG() */
1128 ".exitcall.exit",
1129 ".eh_frame",
1130 ".parainstructions",
1131 ".stab",
1132 "__ex_table",
1133 ".fixup",
1134 ".smp_locks",
1135 ".plt", /* seen on ARCH=um build on x86_64. Harmless */
1136 ".cranges", /* used by sh64 */
1137 NULL
1138 };
1139 /* Start of section names */
1140 const char *namelist2[] = {
1141 ".debug",
1142 NULL
1143 };
1144 /* part of section name */
1145 const char *namelist3 [] = {
1146 ".unwind", /* Sample: IA_64.unwind.exit.text */
1147 NULL
1148 };
1149
1150 for (s = namelist1; *s; s++)
1151 if (strcmp(*s, name) == 0)
1152 return 1;
1153 for (s = namelist2; *s; s++)
1154 if (strncmp(*s, name, strlen(*s)) == 0)
1155 return 1;
1156 for (s = namelist3; *s; s++)
1157 if (strstr(name, *s) != NULL)
1158 return 1;
1159 return 0;
1160 }
1161
1162 static void read_symbols(char *modname)
1163 {
1164 const char *symname;
1165 char *version;
1166 char *license;
1167 struct module *mod;
1168 struct elf_info info = { };
1169 Elf_Sym *sym;
1170
1171 if (!parse_elf(&info, modname))
1172 return;
1173
1174 mod = new_module(modname);
1175
1176 /* When there's no vmlinux, don't print warnings about
1177 * unresolved symbols (since there'll be too many ;) */
1178 if (is_vmlinux(modname)) {
1179 have_vmlinux = 1;
1180 mod->skip = 1;
1181 }
1182
1183 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1184 while (license) {
1185 if (license_is_gpl_compatible(license))
1186 mod->gpl_compatible = 1;
1187 else {
1188 mod->gpl_compatible = 0;
1189 break;
1190 }
1191 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1192 "license", license);
1193 }
1194
1195 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1196 symname = info.strtab + sym->st_name;
1197
1198 handle_modversions(mod, &info, sym, symname);
1199 handle_moddevtable(mod, &info, sym, symname);
1200 }
1201 check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
1202 check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
1203
1204 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1205 if (version)
1206 maybe_frob_rcs_version(modname, version, info.modinfo,
1207 version - (char *)info.hdr);
1208 if (version || (all_versions && !is_vmlinux(modname)))
1209 get_src_version(modname, mod->srcversion,
1210 sizeof(mod->srcversion)-1);
1211
1212 parse_elf_finish(&info);
1213
1214 /* Our trick to get versioning for struct_module - it's
1215 * never passed as an argument to an exported function, so
1216 * the automatic versioning doesn't pick it up, but it's really
1217 * important anyhow */
1218 if (modversions)
1219 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1220 }
1221
1222 #define SZ 500
1223
1224 /* We first write the generated file into memory using the
1225 * following helper, then compare to the file on disk and
1226 * only update the later if anything changed */
1227
1228 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1229 const char *fmt, ...)
1230 {
1231 char tmp[SZ];
1232 int len;
1233 va_list ap;
1234
1235 va_start(ap, fmt);
1236 len = vsnprintf(tmp, SZ, fmt, ap);
1237 buf_write(buf, tmp, len);
1238 va_end(ap);
1239 }
1240
1241 void buf_write(struct buffer *buf, const char *s, int len)
1242 {
1243 if (buf->size - buf->pos < len) {
1244 buf->size += len + SZ;
1245 buf->p = realloc(buf->p, buf->size);
1246 }
1247 strncpy(buf->p + buf->pos, s, len);
1248 buf->pos += len;
1249 }
1250
1251 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1252 {
1253 const char *e = is_vmlinux(m) ?"":".ko";
1254
1255 switch (exp) {
1256 case export_gpl:
1257 fatal("modpost: GPL-incompatible module %s%s "
1258 "uses GPL-only symbol '%s'\n", m, e, s);
1259 break;
1260 case export_unused_gpl:
1261 fatal("modpost: GPL-incompatible module %s%s "
1262 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1263 break;
1264 case export_gpl_future:
1265 warn("modpost: GPL-incompatible module %s%s "
1266 "uses future GPL-only symbol '%s'\n", m, e, s);
1267 break;
1268 case export_plain:
1269 case export_unused:
1270 case export_unknown:
1271 /* ignore */
1272 break;
1273 }
1274 }
1275
1276 static void check_for_unused(enum export exp, const char* m, const char* s)
1277 {
1278 const char *e = is_vmlinux(m) ?"":".ko";
1279
1280 switch (exp) {
1281 case export_unused:
1282 case export_unused_gpl:
1283 warn("modpost: module %s%s "
1284 "uses symbol '%s' marked UNUSED\n", m, e, s);
1285 break;
1286 default:
1287 /* ignore */
1288 break;
1289 }
1290 }
1291
1292 static void check_exports(struct module *mod)
1293 {
1294 struct symbol *s, *exp;
1295
1296 for (s = mod->unres; s; s = s->next) {
1297 const char *basename;
1298 exp = find_symbol(s->name);
1299 if (!exp || exp->module == mod)
1300 continue;
1301 basename = strrchr(mod->name, '/');
1302 if (basename)
1303 basename++;
1304 else
1305 basename = mod->name;
1306 if (!mod->gpl_compatible)
1307 check_for_gpl_usage(exp->export, basename, exp->name);
1308 check_for_unused(exp->export, basename, exp->name);
1309 }
1310 }
1311
1312 /**
1313 * Header for the generated file
1314 **/
1315 static void add_header(struct buffer *b, struct module *mod)
1316 {
1317 buf_printf(b, "#include <linux/module.h>\n");
1318 buf_printf(b, "#include <linux/vermagic.h>\n");
1319 buf_printf(b, "#include <linux/compiler.h>\n");
1320 buf_printf(b, "\n");
1321 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1322 buf_printf(b, "\n");
1323 buf_printf(b, "struct module __this_module\n");
1324 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1325 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1326 if (mod->has_init)
1327 buf_printf(b, " .init = init_module,\n");
1328 if (mod->has_cleanup)
1329 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1330 " .exit = cleanup_module,\n"
1331 "#endif\n");
1332 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1333 buf_printf(b, "};\n");
1334 }
1335
1336 /**
1337 * Record CRCs for unresolved symbols
1338 **/
1339 static int add_versions(struct buffer *b, struct module *mod)
1340 {
1341 struct symbol *s, *exp;
1342 int err = 0;
1343
1344 for (s = mod->unres; s; s = s->next) {
1345 exp = find_symbol(s->name);
1346 if (!exp || exp->module == mod) {
1347 if (have_vmlinux && !s->weak) {
1348 if (warn_unresolved) {
1349 warn("\"%s\" [%s.ko] undefined!\n",
1350 s->name, mod->name);
1351 } else {
1352 merror("\"%s\" [%s.ko] undefined!\n",
1353 s->name, mod->name);
1354 err = 1;
1355 }
1356 }
1357 continue;
1358 }
1359 s->module = exp->module;
1360 s->crc_valid = exp->crc_valid;
1361 s->crc = exp->crc;
1362 }
1363
1364 if (!modversions)
1365 return err;
1366
1367 buf_printf(b, "\n");
1368 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1369 buf_printf(b, "__attribute_used__\n");
1370 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1371
1372 for (s = mod->unres; s; s = s->next) {
1373 if (!s->module) {
1374 continue;
1375 }
1376 if (!s->crc_valid) {
1377 warn("\"%s\" [%s.ko] has no CRC!\n",
1378 s->name, mod->name);
1379 continue;
1380 }
1381 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1382 }
1383
1384 buf_printf(b, "};\n");
1385
1386 return err;
1387 }
1388
1389 static void add_depends(struct buffer *b, struct module *mod,
1390 struct module *modules)
1391 {
1392 struct symbol *s;
1393 struct module *m;
1394 int first = 1;
1395
1396 for (m = modules; m; m = m->next) {
1397 m->seen = is_vmlinux(m->name);
1398 }
1399
1400 buf_printf(b, "\n");
1401 buf_printf(b, "static const char __module_depends[]\n");
1402 buf_printf(b, "__attribute_used__\n");
1403 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1404 buf_printf(b, "\"depends=");
1405 for (s = mod->unres; s; s = s->next) {
1406 const char *p;
1407 if (!s->module)
1408 continue;
1409
1410 if (s->module->seen)
1411 continue;
1412
1413 s->module->seen = 1;
1414 if ((p = strrchr(s->module->name, '/')) != NULL)
1415 p++;
1416 else
1417 p = s->module->name;
1418 buf_printf(b, "%s%s", first ? "" : ",", p);
1419 first = 0;
1420 }
1421 buf_printf(b, "\";\n");
1422 }
1423
1424 static void add_srcversion(struct buffer *b, struct module *mod)
1425 {
1426 if (mod->srcversion[0]) {
1427 buf_printf(b, "\n");
1428 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1429 mod->srcversion);
1430 }
1431 }
1432
1433 static void write_if_changed(struct buffer *b, const char *fname)
1434 {
1435 char *tmp;
1436 FILE *file;
1437 struct stat st;
1438
1439 file = fopen(fname, "r");
1440 if (!file)
1441 goto write;
1442
1443 if (fstat(fileno(file), &st) < 0)
1444 goto close_write;
1445
1446 if (st.st_size != b->pos)
1447 goto close_write;
1448
1449 tmp = NOFAIL(malloc(b->pos));
1450 if (fread(tmp, 1, b->pos, file) != b->pos)
1451 goto free_write;
1452
1453 if (memcmp(tmp, b->p, b->pos) != 0)
1454 goto free_write;
1455
1456 free(tmp);
1457 fclose(file);
1458 return;
1459
1460 free_write:
1461 free(tmp);
1462 close_write:
1463 fclose(file);
1464 write:
1465 file = fopen(fname, "w");
1466 if (!file) {
1467 perror(fname);
1468 exit(1);
1469 }
1470 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1471 perror(fname);
1472 exit(1);
1473 }
1474 fclose(file);
1475 }
1476
1477 /* parse Module.symvers file. line format:
1478 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1479 **/
1480 static void read_dump(const char *fname, unsigned int kernel)
1481 {
1482 unsigned long size, pos = 0;
1483 void *file = grab_file(fname, &size);
1484 char *line;
1485
1486 if (!file)
1487 /* No symbol versions, silently ignore */
1488 return;
1489
1490 while ((line = get_next_line(&pos, file, size))) {
1491 char *symname, *modname, *d, *export, *end;
1492 unsigned int crc;
1493 struct module *mod;
1494 struct symbol *s;
1495
1496 if (!(symname = strchr(line, '\t')))
1497 goto fail;
1498 *symname++ = '\0';
1499 if (!(modname = strchr(symname, '\t')))
1500 goto fail;
1501 *modname++ = '\0';
1502 if ((export = strchr(modname, '\t')) != NULL)
1503 *export++ = '\0';
1504 if (export && ((end = strchr(export, '\t')) != NULL))
1505 *end = '\0';
1506 crc = strtoul(line, &d, 16);
1507 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1508 goto fail;
1509
1510 if (!(mod = find_module(modname))) {
1511 if (is_vmlinux(modname)) {
1512 have_vmlinux = 1;
1513 }
1514 mod = new_module(NOFAIL(strdup(modname)));
1515 mod->skip = 1;
1516 }
1517 s = sym_add_exported(symname, mod, export_no(export));
1518 s->kernel = kernel;
1519 s->preloaded = 1;
1520 sym_update_crc(symname, mod, crc, export_no(export));
1521 }
1522 return;
1523 fail:
1524 fatal("parse error in symbol dump file\n");
1525 }
1526
1527 /* For normal builds always dump all symbols.
1528 * For external modules only dump symbols
1529 * that are not read from kernel Module.symvers.
1530 **/
1531 static int dump_sym(struct symbol *sym)
1532 {
1533 if (!external_module)
1534 return 1;
1535 if (sym->vmlinux || sym->kernel)
1536 return 0;
1537 return 1;
1538 }
1539
1540 static void write_dump(const char *fname)
1541 {
1542 struct buffer buf = { };
1543 struct symbol *symbol;
1544 int n;
1545
1546 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1547 symbol = symbolhash[n];
1548 while (symbol) {
1549 if (dump_sym(symbol))
1550 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1551 symbol->crc, symbol->name,
1552 symbol->module->name,
1553 export_str(symbol->export));
1554 symbol = symbol->next;
1555 }
1556 }
1557 write_if_changed(&buf, fname);
1558 }
1559
1560 int main(int argc, char **argv)
1561 {
1562 struct module *mod;
1563 struct buffer buf = { };
1564 char fname[SZ];
1565 char *kernel_read = NULL, *module_read = NULL;
1566 char *dump_write = NULL;
1567 int opt;
1568 int err;
1569
1570 while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) {
1571 switch(opt) {
1572 case 'i':
1573 kernel_read = optarg;
1574 break;
1575 case 'I':
1576 module_read = optarg;
1577 external_module = 1;
1578 break;
1579 case 'm':
1580 modversions = 1;
1581 break;
1582 case 'o':
1583 dump_write = optarg;
1584 break;
1585 case 'a':
1586 all_versions = 1;
1587 break;
1588 case 'w':
1589 warn_unresolved = 1;
1590 break;
1591 default:
1592 exit(1);
1593 }
1594 }
1595
1596 if (kernel_read)
1597 read_dump(kernel_read, 1);
1598 if (module_read)
1599 read_dump(module_read, 0);
1600
1601 while (optind < argc) {
1602 read_symbols(argv[optind++]);
1603 }
1604
1605 for (mod = modules; mod; mod = mod->next) {
1606 if (mod->skip)
1607 continue;
1608 check_exports(mod);
1609 }
1610
1611 err = 0;
1612
1613 for (mod = modules; mod; mod = mod->next) {
1614 if (mod->skip)
1615 continue;
1616
1617 buf.pos = 0;
1618
1619 add_header(&buf, mod);
1620 err |= add_versions(&buf, mod);
1621 add_depends(&buf, mod, modules);
1622 add_moddevtable(&buf, mod);
1623 add_srcversion(&buf, mod);
1624
1625 sprintf(fname, "%s.mod.c", mod->name);
1626 write_if_changed(&buf, fname);
1627 }
1628
1629 if (dump_write)
1630 write_dump(dump_write);
1631
1632 return err;
1633 }
WRT350N Kernel Patches