projects/linux·blob v2.6.21 · refs

1543 lines · 38.0 KiB

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