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ext3: lighten up resize transaction requirements
[linux-2.6/mini2440.git] / scripts / mod / modpost.c
blob2ef9a193fcaef33cc527dab5ace20dd492ba4af1
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 /* Warn about section mismatch in vmlinux if set to 1 */
27 static int vmlinux_section_warnings = 1;
28 /* Only warn about unresolved symbols */
29 static int warn_unresolved = 0;
30 /* How a symbol is exported */
31 enum export {
32 export_plain, export_unused, export_gpl,
33 export_unused_gpl, export_gpl_future, export_unknown
34 };
35
36 void fatal(const char *fmt, ...)
37 {
38 va_list arglist;
39
40 fprintf(stderr, "FATAL: ");
41
42 va_start(arglist, fmt);
43 vfprintf(stderr, fmt, arglist);
44 va_end(arglist);
45
46 exit(1);
47 }
48
49 void warn(const char *fmt, ...)
50 {
51 va_list arglist;
52
53 fprintf(stderr, "WARNING: ");
54
55 va_start(arglist, fmt);
56 vfprintf(stderr, fmt, arglist);
57 va_end(arglist);
58 }
59
60 void merror(const char *fmt, ...)
61 {
62 va_list arglist;
63
64 fprintf(stderr, "ERROR: ");
65
66 va_start(arglist, fmt);
67 vfprintf(stderr, fmt, arglist);
68 va_end(arglist);
69 }
70
71 static int is_vmlinux(const char *modname)
72 {
73 const char *myname;
74
75 if ((myname = strrchr(modname, '/')))
76 myname++;
77 else
78 myname = modname;
79
80 return (strcmp(myname, "vmlinux") == 0) ||
81 (strcmp(myname, "vmlinux.o") == 0);
82 }
83
84 void *do_nofail(void *ptr, const char *expr)
85 {
86 if (!ptr) {
87 fatal("modpost: Memory allocation failure: %s.\n", expr);
88 }
89 return ptr;
90 }
91
92 /* A list of all modules we processed */
93
94 static struct module *modules;
95
96 static struct module *find_module(char *modname)
97 {
98 struct module *mod;
99
100 for (mod = modules; mod; mod = mod->next)
101 if (strcmp(mod->name, modname) == 0)
102 break;
103 return mod;
104 }
105
106 static struct module *new_module(char *modname)
107 {
108 struct module *mod;
109 char *p, *s;
110
111 mod = NOFAIL(malloc(sizeof(*mod)));
112 memset(mod, 0, sizeof(*mod));
113 p = NOFAIL(strdup(modname));
114
115 /* strip trailing .o */
116 if ((s = strrchr(p, '.')) != NULL)
117 if (strcmp(s, ".o") == 0)
118 *s = '\0';
119
120 /* add to list */
121 mod->name = p;
122 mod->gpl_compatible = -1;
123 mod->next = modules;
124 modules = mod;
125
126 return mod;
127 }
128
129 /* A hash of all exported symbols,
130 * struct symbol is also used for lists of unresolved symbols */
131
132 #define SYMBOL_HASH_SIZE 1024
133
134 struct symbol {
135 struct symbol *next;
136 struct module *module;
137 unsigned int crc;
138 int crc_valid;
139 unsigned int weak:1;
140 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
141 unsigned int kernel:1; /* 1 if symbol is from kernel
142 * (only for external modules) **/
143 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
144 enum export export; /* Type of export */
145 char name[0];
146 };
147
148 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
149
150 /* This is based on the hash agorithm from gdbm, via tdb */
151 static inline unsigned int tdb_hash(const char *name)
152 {
153 unsigned value; /* Used to compute the hash value. */
154 unsigned i; /* Used to cycle through random values. */
155
156 /* Set the initial value from the key size. */
157 for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
158 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
159
160 return (1103515243 * value + 12345);
161 }
162
163 /**
164 * Allocate a new symbols for use in the hash of exported symbols or
165 * the list of unresolved symbols per module
166 **/
167 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
168 struct symbol *next)
169 {
170 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
171
172 memset(s, 0, sizeof(*s));
173 strcpy(s->name, name);
174 s->weak = weak;
175 s->next = next;
176 return s;
177 }
178
179 /* For the hash of exported symbols */
180 static struct symbol *new_symbol(const char *name, struct module *module,
181 enum export export)
182 {
183 unsigned int hash;
184 struct symbol *new;
185
186 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
187 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
188 new->module = module;
189 new->export = export;
190 return new;
191 }
192
193 static struct symbol *find_symbol(const char *name)
194 {
195 struct symbol *s;
196
197 /* For our purposes, .foo matches foo. PPC64 needs this. */
198 if (name[0] == '.')
199 name++;
200
201 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) {
202 if (strcmp(s->name, name) == 0)
203 return s;
204 }
205 return NULL;
206 }
207
208 static struct {
209 const char *str;
210 enum export export;
211 } export_list[] = {
212 { .str = "EXPORT_SYMBOL", .export = export_plain },
213 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
214 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
215 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
216 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
217 { .str = "(unknown)", .export = export_unknown },
218 };
219
220
221 static const char *export_str(enum export ex)
222 {
223 return export_list[ex].str;
224 }
225
226 static enum export export_no(const char * s)
227 {
228 int i;
229 if (!s)
230 return export_unknown;
231 for (i = 0; export_list[i].export != export_unknown; i++) {
232 if (strcmp(export_list[i].str, s) == 0)
233 return export_list[i].export;
234 }
235 return export_unknown;
236 }
237
238 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
239 {
240 if (sec == elf->export_sec)
241 return export_plain;
242 else if (sec == elf->export_unused_sec)
243 return export_unused;
244 else if (sec == elf->export_gpl_sec)
245 return export_gpl;
246 else if (sec == elf->export_unused_gpl_sec)
247 return export_unused_gpl;
248 else if (sec == elf->export_gpl_future_sec)
249 return export_gpl_future;
250 else
251 return export_unknown;
252 }
253
254 /**
255 * Add an exported symbol - it may have already been added without a
256 * CRC, in this case just update the CRC
257 **/
258 static struct symbol *sym_add_exported(const char *name, struct module *mod,
259 enum export export)
260 {
261 struct symbol *s = find_symbol(name);
262
263 if (!s) {
264 s = new_symbol(name, mod, export);
265 } else {
266 if (!s->preloaded) {
267 warn("%s: '%s' exported twice. Previous export "
268 "was in %s%s\n", mod->name, name,
269 s->module->name,
270 is_vmlinux(s->module->name) ?"":".ko");
271 }
272 }
273 s->preloaded = 0;
274 s->vmlinux = is_vmlinux(mod->name);
275 s->kernel = 0;
276 s->export = export;
277 return s;
278 }
279
280 static void sym_update_crc(const char *name, struct module *mod,
281 unsigned int crc, enum export export)
282 {
283 struct symbol *s = find_symbol(name);
284
285 if (!s)
286 s = new_symbol(name, mod, export);
287 s->crc = crc;
288 s->crc_valid = 1;
289 }
290
291 void *grab_file(const char *filename, unsigned long *size)
292 {
293 struct stat st;
294 void *map;
295 int fd;
296
297 fd = open(filename, O_RDONLY);
298 if (fd < 0 || fstat(fd, &st) != 0)
299 return NULL;
300
301 *size = st.st_size;
302 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
303 close(fd);
304
305 if (map == MAP_FAILED)
306 return NULL;
307 return map;
308 }
309
310 /**
311 * Return a copy of the next line in a mmap'ed file.
312 * spaces in the beginning of the line is trimmed away.
313 * Return a pointer to a static buffer.
314 **/
315 char* get_next_line(unsigned long *pos, void *file, unsigned long size)
316 {
317 static char line[4096];
318 int skip = 1;
319 size_t len = 0;
320 signed char *p = (signed char *)file + *pos;
321 char *s = line;
322
323 for (; *pos < size ; (*pos)++)
324 {
325 if (skip && isspace(*p)) {
326 p++;
327 continue;
328 }
329 skip = 0;
330 if (*p != '\n' && (*pos < size)) {
331 len++;
332 *s++ = *p++;
333 if (len > 4095)
334 break; /* Too long, stop */
335 } else {
336 /* End of string */
337 *s = '\0';
338 return line;
339 }
340 }
341 /* End of buffer */
342 return NULL;
343 }
344
345 void release_file(void *file, unsigned long size)
346 {
347 munmap(file, size);
348 }
349
350 static int parse_elf(struct elf_info *info, const char *filename)
351 {
352 unsigned int i;
353 Elf_Ehdr *hdr;
354 Elf_Shdr *sechdrs;
355 Elf_Sym *sym;
356
357 hdr = grab_file(filename, &info->size);
358 if (!hdr) {
359 perror(filename);
360 exit(1);
361 }
362 info->hdr = hdr;
363 if (info->size < sizeof(*hdr)) {
364 /* file too small, assume this is an empty .o file */
365 return 0;
366 }
367 /* Is this a valid ELF file? */
368 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
369 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
370 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
371 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
372 /* Not an ELF file - silently ignore it */
373 return 0;
374 }
375 /* Fix endianness in ELF header */
376 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
377 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
378 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
379 hdr->e_machine = TO_NATIVE(hdr->e_machine);
380 hdr->e_type = TO_NATIVE(hdr->e_type);
381 sechdrs = (void *)hdr + hdr->e_shoff;
382 info->sechdrs = sechdrs;
383
384 /* Check if file offset is correct */
385 if (hdr->e_shoff > info->size) {
386 fatal("section header offset=%u in file '%s' is bigger then filesize=%lu\n", hdr->e_shoff, filename, info->size);
387 return 0;
388 }
389
390 /* Fix endianness in section headers */
391 for (i = 0; i < hdr->e_shnum; i++) {
392 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
393 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
394 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
395 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
396 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
397 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
398 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
399 }
400 /* Find symbol table. */
401 for (i = 1; i < hdr->e_shnum; i++) {
402 const char *secstrings
403 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
404 const char *secname;
405
406 if (sechdrs[i].sh_offset > info->size) {
407 fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
408 return 0;
409 }
410 secname = secstrings + sechdrs[i].sh_name;
411 if (strcmp(secname, ".modinfo") == 0) {
412 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
413 info->modinfo_len = sechdrs[i].sh_size;
414 } else if (strcmp(secname, "__ksymtab") == 0)
415 info->export_sec = i;
416 else if (strcmp(secname, "__ksymtab_unused") == 0)
417 info->export_unused_sec = i;
418 else if (strcmp(secname, "__ksymtab_gpl") == 0)
419 info->export_gpl_sec = i;
420 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
421 info->export_unused_gpl_sec = i;
422 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
423 info->export_gpl_future_sec = i;
424
425 if (sechdrs[i].sh_type != SHT_SYMTAB)
426 continue;
427
428 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
429 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
430 + sechdrs[i].sh_size;
431 info->strtab = (void *)hdr +
432 sechdrs[sechdrs[i].sh_link].sh_offset;
433 }
434 if (!info->symtab_start) {
435 fatal("%s has no symtab?\n", filename);
436 }
437 /* Fix endianness in symbols */
438 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
439 sym->st_shndx = TO_NATIVE(sym->st_shndx);
440 sym->st_name = TO_NATIVE(sym->st_name);
441 sym->st_value = TO_NATIVE(sym->st_value);
442 sym->st_size = TO_NATIVE(sym->st_size);
443 }
444 return 1;
445 }
446
447 static void parse_elf_finish(struct elf_info *info)
448 {
449 release_file(info->hdr, info->size);
450 }
451
452 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
453 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
454
455 static void handle_modversions(struct module *mod, struct elf_info *info,
456 Elf_Sym *sym, const char *symname)
457 {
458 unsigned int crc;
459 enum export export = export_from_sec(info, sym->st_shndx);
460
461 switch (sym->st_shndx) {
462 case SHN_COMMON:
463 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
464 break;
465 case SHN_ABS:
466 /* CRC'd symbol */
467 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
468 crc = (unsigned int) sym->st_value;
469 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
470 export);
471 }
472 break;
473 case SHN_UNDEF:
474 /* undefined symbol */
475 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
476 ELF_ST_BIND(sym->st_info) != STB_WEAK)
477 break;
478 /* ignore global offset table */
479 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
480 break;
481 /* ignore __this_module, it will be resolved shortly */
482 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
483 break;
484 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
485 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
486 /* add compatibility with older glibc */
487 #ifndef STT_SPARC_REGISTER
488 #define STT_SPARC_REGISTER STT_REGISTER
489 #endif
490 if (info->hdr->e_machine == EM_SPARC ||
491 info->hdr->e_machine == EM_SPARCV9) {
492 /* Ignore register directives. */
493 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
494 break;
495 if (symname[0] == '.') {
496 char *munged = strdup(symname);
497 munged[0] = '_';
498 munged[1] = toupper(munged[1]);
499 symname = munged;
500 }
501 }
502 #endif
503
504 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
505 strlen(MODULE_SYMBOL_PREFIX)) == 0)
506 mod->unres = alloc_symbol(symname +
507 strlen(MODULE_SYMBOL_PREFIX),
508 ELF_ST_BIND(sym->st_info) == STB_WEAK,
509 mod->unres);
510 break;
511 default:
512 /* All exported symbols */
513 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
514 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
515 export);
516 }
517 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
518 mod->has_init = 1;
519 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
520 mod->has_cleanup = 1;
521 break;
522 }
523 }
524
525 /**
526 * Parse tag=value strings from .modinfo section
527 **/
528 static char *next_string(char *string, unsigned long *secsize)
529 {
530 /* Skip non-zero chars */
531 while (string[0]) {
532 string++;
533 if ((*secsize)-- <= 1)
534 return NULL;
535 }
536
537 /* Skip any zero padding. */
538 while (!string[0]) {
539 string++;
540 if ((*secsize)-- <= 1)
541 return NULL;
542 }
543 return string;
544 }
545
546 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
547 const char *tag, char *info)
548 {
549 char *p;
550 unsigned int taglen = strlen(tag);
551 unsigned long size = modinfo_len;
552
553 if (info) {
554 size -= info - (char *)modinfo;
555 modinfo = next_string(info, &size);
556 }
557
558 for (p = modinfo; p; p = next_string(p, &size)) {
559 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
560 return p + taglen + 1;
561 }
562 return NULL;
563 }
564
565 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
566 const char *tag)
567
568 {
569 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
570 }
571
572 /**
573 * Test if string s ends in string sub
574 * return 0 if match
575 **/
576 static int strrcmp(const char *s, const char *sub)
577 {
578 int slen, sublen;
579
580 if (!s || !sub)
581 return 1;
582
583 slen = strlen(s);
584 sublen = strlen(sub);
585
586 if ((slen == 0) || (sublen == 0))
587 return 1;
588
589 if (sublen > slen)
590 return 1;
591
592 return memcmp(s + slen - sublen, sub, sublen);
593 }
594
595 /*
596 * Functions used only during module init is marked __init and is stored in
597 * a .init.text section. Likewise data is marked __initdata and stored in
598 * a .init.data section.
599 * If this section is one of these sections return 1
600 * See include/linux/init.h for the details
601 */
602 static int init_section(const char *name)
603 {
604 if (strcmp(name, ".init") == 0)
605 return 1;
606 if (strncmp(name, ".init.", strlen(".init.")) == 0)
607 return 1;
608 return 0;
609 }
610
611 /*
612 * Functions used only during module exit is marked __exit and is stored in
613 * a .exit.text section. Likewise data is marked __exitdata and stored in
614 * a .exit.data section.
615 * If this section is one of these sections return 1
616 * See include/linux/init.h for the details
617 **/
618 static int exit_section(const char *name)
619 {
620 if (strcmp(name, ".exit.text") == 0)
621 return 1;
622 if (strcmp(name, ".exit.data") == 0)
623 return 1;
624 return 0;
625
626 }
627
628 /*
629 * Data sections are named like this:
630 * .data | .data.rel | .data.rel.*
631 * Return 1 if the specified section is a data section
632 */
633 static int data_section(const char *name)
634 {
635 if ((strcmp(name, ".data") == 0) ||
636 (strcmp(name, ".data.rel") == 0) ||
637 (strncmp(name, ".data.rel.", strlen(".data.rel.")) == 0))
638 return 1;
639 else
640 return 0;
641 }
642
643 /**
644 * Whitelist to allow certain references to pass with no warning.
645 *
646 * Pattern 0:
647 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
648 * The pattern is identified by:
649 * fromsec = .text.init.refok* | .data.init.refok*
650 *
651 * Pattern 1:
652 * If a module parameter is declared __initdata and permissions=0
653 * then this is legal despite the warning generated.
654 * We cannot see value of permissions here, so just ignore
655 * this pattern.
656 * The pattern is identified by:
657 * tosec = .init.data
658 * fromsec = .data*
659 * atsym =__param*
660 *
661 * Pattern 2:
662 * Many drivers utilise a *driver container with references to
663 * add, remove, probe functions etc.
664 * These functions may often be marked __init and we do not want to
665 * warn here.
666 * the pattern is identified by:
667 * tosec = init or exit section
668 * fromsec = data section
669 * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console, *_timer
670 *
671 * Pattern 3:
672 * Whitelist all refereces from .text.head to .init.data
673 * Whitelist all refereces from .text.head to .init.text
674 *
675 * Pattern 4:
676 * Some symbols belong to init section but still it is ok to reference
677 * these from non-init sections as these symbols don't have any memory
678 * allocated for them and symbol address and value are same. So even
679 * if init section is freed, its ok to reference those symbols.
680 * For ex. symbols marking the init section boundaries.
681 * This pattern is identified by
682 * refsymname = __init_begin, _sinittext, _einittext
683 *
684 * Pattern 5:
685 * Xtensa uses literal sections for constants that are accessed PC-relative.
686 * Literal sections may safely reference their text sections.
687 * (Note that the name for the literal section omits any trailing '.text')
688 * tosec = <section>[.text]
689 * fromsec = <section>.literal
690 **/
691 static int secref_whitelist(const char *modname, const char *tosec,
692 const char *fromsec, const char *atsym,
693 const char *refsymname)
694 {
695 int len;
696 const char **s;
697 const char *pat2sym[] = {
698 "driver",
699 "_template", /* scsi uses *_template a lot */
700 "_timer", /* arm uses ops structures named _timer a lot */
701 "_sht", /* scsi also used *_sht to some extent */
702 "_ops",
703 "_probe",
704 "_probe_one",
705 "_console",
706 NULL
707 };
708
709 const char *pat3refsym[] = {
710 "__init_begin",
711 "_sinittext",
712 "_einittext",
713 NULL
714 };
715
716 /* Check for pattern 0 */
717 if ((strncmp(fromsec, ".text.init.refok", strlen(".text.init.refok")) == 0) ||
718 (strncmp(fromsec, ".exit.text.refok", strlen(".exit.text.refok")) == 0) ||
719 (strncmp(fromsec, ".data.init.refok", strlen(".data.init.refok")) == 0))
720 return 1;
721
722 /* Check for pattern 1 */
723 if ((strcmp(tosec, ".init.data") == 0) &&
724 (strncmp(fromsec, ".data", strlen(".data")) == 0) &&
725 (strncmp(atsym, "__param", strlen("__param")) == 0))
726 return 1;
727
728 /* Check for pattern 2 */
729 if ((init_section(tosec) || exit_section(tosec)) && data_section(fromsec))
730 for (s = pat2sym; *s; s++)
731 if (strrcmp(atsym, *s) == 0)
732 return 1;
733
734 /* Check for pattern 3 */
735 if ((strcmp(fromsec, ".text.head") == 0) &&
736 ((strcmp(tosec, ".init.data") == 0) ||
737 (strcmp(tosec, ".init.text") == 0)))
738 return 1;
739
740 /* Check for pattern 4 */
741 for (s = pat3refsym; *s; s++)
742 if (strcmp(refsymname, *s) == 0)
743 return 1;
744
745 /* Check for pattern 5 */
746 if (strrcmp(tosec, ".text") == 0)
747 len = strlen(tosec) - strlen(".text");
748 else
749 len = strlen(tosec);
750 if ((strncmp(tosec, fromsec, len) == 0) && (strlen(fromsec) > len) &&
751 (strcmp(fromsec + len, ".literal") == 0))
752 return 1;
753
754 return 0;
755 }
756
757 /**
758 * Find symbol based on relocation record info.
759 * In some cases the symbol supplied is a valid symbol so
760 * return refsym. If st_name != 0 we assume this is a valid symbol.
761 * In other cases the symbol needs to be looked up in the symbol table
762 * based on section and address.
763 * **/
764 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
765 Elf_Sym *relsym)
766 {
767 Elf_Sym *sym;
768
769 if (relsym->st_name != 0)
770 return relsym;
771 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
772 if (sym->st_shndx != relsym->st_shndx)
773 continue;
774 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
775 continue;
776 if (sym->st_value == addr)
777 return sym;
778 }
779 return NULL;
780 }
781
782 static inline int is_arm_mapping_symbol(const char *str)
783 {
784 return str[0] == '$' && strchr("atd", str[1])
785 && (str[2] == '\0' || str[2] == '.');
786 }
787
788 /*
789 * If there's no name there, ignore it; likewise, ignore it if it's
790 * one of the magic symbols emitted used by current ARM tools.
791 *
792 * Otherwise if find_symbols_between() returns those symbols, they'll
793 * fail the whitelist tests and cause lots of false alarms ... fixable
794 * only by merging __exit and __init sections into __text, bloating
795 * the kernel (which is especially evil on embedded platforms).
796 */
797 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
798 {
799 const char *name = elf->strtab + sym->st_name;
800
801 if (!name || !strlen(name))
802 return 0;
803 return !is_arm_mapping_symbol(name);
804 }
805
806 /*
807 * Find symbols before or equal addr and after addr - in the section sec.
808 * If we find two symbols with equal offset prefer one with a valid name.
809 * The ELF format may have a better way to detect what type of symbol
810 * it is, but this works for now.
811 **/
812 static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
813 const char *sec,
814 Elf_Sym **before, Elf_Sym **after)
815 {
816 Elf_Sym *sym;
817 Elf_Ehdr *hdr = elf->hdr;
818 Elf_Addr beforediff = ~0;
819 Elf_Addr afterdiff = ~0;
820 const char *secstrings = (void *)hdr +
821 elf->sechdrs[hdr->e_shstrndx].sh_offset;
822
823 *before = NULL;
824 *after = NULL;
825
826 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
827 const char *symsec;
828
829 if (sym->st_shndx >= SHN_LORESERVE)
830 continue;
831 symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
832 if (strcmp(symsec, sec) != 0)
833 continue;
834 if (!is_valid_name(elf, sym))
835 continue;
836 if (sym->st_value <= addr) {
837 if ((addr - sym->st_value) < beforediff) {
838 beforediff = addr - sym->st_value;
839 *before = sym;
840 }
841 else if ((addr - sym->st_value) == beforediff) {
842 *before = sym;
843 }
844 }
845 else
846 {
847 if ((sym->st_value - addr) < afterdiff) {
848 afterdiff = sym->st_value - addr;
849 *after = sym;
850 }
851 else if ((sym->st_value - addr) == afterdiff) {
852 *after = sym;
853 }
854 }
855 }
856 }
857
858 /**
859 * Print a warning about a section mismatch.
860 * Try to find symbols near it so user can find it.
861 * Check whitelist before warning - it may be a false positive.
862 **/
863 static void warn_sec_mismatch(const char *modname, const char *fromsec,
864 struct elf_info *elf, Elf_Sym *sym, Elf_Rela r)
865 {
866 const char *refsymname = "";
867 Elf_Sym *before, *after;
868 Elf_Sym *refsym;
869 Elf_Ehdr *hdr = elf->hdr;
870 Elf_Shdr *sechdrs = elf->sechdrs;
871 const char *secstrings = (void *)hdr +
872 sechdrs[hdr->e_shstrndx].sh_offset;
873 const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name;
874
875 find_symbols_between(elf, r.r_offset, fromsec, &before, &after);
876
877 refsym = find_elf_symbol(elf, r.r_addend, sym);
878 if (refsym && strlen(elf->strtab + refsym->st_name))
879 refsymname = elf->strtab + refsym->st_name;
880
881 /* check whitelist - we may ignore it */
882 if (secref_whitelist(modname, secname, fromsec,
883 before ? elf->strtab + before->st_name : "",
884 refsymname))
885 return;
886
887 if (before && after) {
888 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
889 "(between '%s' and '%s')\n",
890 modname, fromsec, (unsigned long long)r.r_offset,
891 secname, refsymname,
892 elf->strtab + before->st_name,
893 elf->strtab + after->st_name);
894 } else if (before) {
895 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
896 "(after '%s')\n",
897 modname, fromsec, (unsigned long long)r.r_offset,
898 secname, refsymname,
899 elf->strtab + before->st_name);
900 } else if (after) {
901 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
902 "before '%s' (at offset -0x%llx)\n",
903 modname, fromsec, (unsigned long long)r.r_offset,
904 secname, refsymname,
905 elf->strtab + after->st_name);
906 } else {
907 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
908 modname, fromsec, (unsigned long long)r.r_offset,
909 secname, refsymname);
910 }
911 }
912
913 static unsigned int *reloc_location(struct elf_info *elf,
914 int rsection, Elf_Rela *r)
915 {
916 Elf_Shdr *sechdrs = elf->sechdrs;
917 int section = sechdrs[rsection].sh_info;
918
919 return (void *)elf->hdr + sechdrs[section].sh_offset +
920 (r->r_offset - sechdrs[section].sh_addr);
921 }
922
923 static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
924 {
925 unsigned int r_typ = ELF_R_TYPE(r->r_info);
926 unsigned int *location = reloc_location(elf, rsection, r);
927
928 switch (r_typ) {
929 case R_386_32:
930 r->r_addend = TO_NATIVE(*location);
931 break;
932 case R_386_PC32:
933 r->r_addend = TO_NATIVE(*location) + 4;
934 /* For CONFIG_RELOCATABLE=y */
935 if (elf->hdr->e_type == ET_EXEC)
936 r->r_addend += r->r_offset;
937 break;
938 }
939 return 0;
940 }
941
942 static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
943 {
944 unsigned int r_typ = ELF_R_TYPE(r->r_info);
945
946 switch (r_typ) {
947 case R_ARM_ABS32:
948 /* From ARM ABI: (S + A) | T */
949 r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
950 break;
951 case R_ARM_PC24:
952 /* From ARM ABI: ((S + A) | T) - P */
953 r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
954 (r->r_offset - elf->sechdrs[rsection].sh_addr));
955 break;
956 default:
957 return 1;
958 }
959 return 0;
960 }
961
962 static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
963 {
964 unsigned int r_typ = ELF_R_TYPE(r->r_info);
965 unsigned int *location = reloc_location(elf, rsection, r);
966 unsigned int inst;
967
968 if (r_typ == R_MIPS_HI16)
969 return 1; /* skip this */
970 inst = TO_NATIVE(*location);
971 switch (r_typ) {
972 case R_MIPS_LO16:
973 r->r_addend = inst & 0xffff;
974 break;
975 case R_MIPS_26:
976 r->r_addend = (inst & 0x03ffffff) << 2;
977 break;
978 case R_MIPS_32:
979 r->r_addend = inst;
980 break;
981 }
982 return 0;
983 }
984
985 /**
986 * A module includes a number of sections that are discarded
987 * either when loaded or when used as built-in.
988 * For loaded modules all functions marked __init and all data
989 * marked __initdata will be discarded when the module has been intialized.
990 * Likewise for modules used built-in the sections marked __exit
991 * are discarded because __exit marked function are supposed to be called
992 * only when a moduel is unloaded which never happes for built-in modules.
993 * The check_sec_ref() function traverses all relocation records
994 * to find all references to a section that reference a section that will
995 * be discarded and warns about it.
996 **/
997 static void check_sec_ref(struct module *mod, const char *modname,
998 struct elf_info *elf,
999 int section(const char*),
1000 int section_ref_ok(const char *))
1001 {
1002 int i;
1003 Elf_Sym *sym;
1004 Elf_Ehdr *hdr = elf->hdr;
1005 Elf_Shdr *sechdrs = elf->sechdrs;
1006 const char *secstrings = (void *)hdr +
1007 sechdrs[hdr->e_shstrndx].sh_offset;
1008
1009 /* Walk through all sections */
1010 for (i = 0; i < hdr->e_shnum; i++) {
1011 const char *name = secstrings + sechdrs[i].sh_name;
1012 const char *secname;
1013 Elf_Rela r;
1014 unsigned int r_sym;
1015 /* We want to process only relocation sections and not .init */
1016 if (sechdrs[i].sh_type == SHT_RELA) {
1017 Elf_Rela *rela;
1018 Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
1019 Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
1020 name += strlen(".rela");
1021 if (section_ref_ok(name))
1022 continue;
1023
1024 for (rela = start; rela < stop; rela++) {
1025 r.r_offset = TO_NATIVE(rela->r_offset);
1026 #if KERNEL_ELFCLASS == ELFCLASS64
1027 if (hdr->e_machine == EM_MIPS) {
1028 unsigned int r_typ;
1029 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1030 r_sym = TO_NATIVE(r_sym);
1031 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1032 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1033 } else {
1034 r.r_info = TO_NATIVE(rela->r_info);
1035 r_sym = ELF_R_SYM(r.r_info);
1036 }
1037 #else
1038 r.r_info = TO_NATIVE(rela->r_info);
1039 r_sym = ELF_R_SYM(r.r_info);
1040 #endif
1041 r.r_addend = TO_NATIVE(rela->r_addend);
1042 sym = elf->symtab_start + r_sym;
1043 /* Skip special sections */
1044 if (sym->st_shndx >= SHN_LORESERVE)
1045 continue;
1046
1047 secname = secstrings +
1048 sechdrs[sym->st_shndx].sh_name;
1049 if (section(secname))
1050 warn_sec_mismatch(modname, name,
1051 elf, sym, r);
1052 }
1053 } else if (sechdrs[i].sh_type == SHT_REL) {
1054 Elf_Rel *rel;
1055 Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
1056 Elf_Rel *stop = (void*)start + sechdrs[i].sh_size;
1057 name += strlen(".rel");
1058 if (section_ref_ok(name))
1059 continue;
1060
1061 for (rel = start; rel < stop; rel++) {
1062 r.r_offset = TO_NATIVE(rel->r_offset);
1063 #if KERNEL_ELFCLASS == ELFCLASS64
1064 if (hdr->e_machine == EM_MIPS) {
1065 unsigned int r_typ;
1066 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1067 r_sym = TO_NATIVE(r_sym);
1068 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1069 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1070 } else {
1071 r.r_info = TO_NATIVE(rel->r_info);
1072 r_sym = ELF_R_SYM(r.r_info);
1073 }
1074 #else
1075 r.r_info = TO_NATIVE(rel->r_info);
1076 r_sym = ELF_R_SYM(r.r_info);
1077 #endif
1078 r.r_addend = 0;
1079 switch (hdr->e_machine) {
1080 case EM_386:
1081 if (addend_386_rel(elf, i, &r))
1082 continue;
1083 break;
1084 case EM_ARM:
1085 if(addend_arm_rel(elf, i, &r))
1086 continue;
1087 break;
1088 case EM_MIPS:
1089 if (addend_mips_rel(elf, i, &r))
1090 continue;
1091 break;
1092 }
1093 sym = elf->symtab_start + r_sym;
1094 /* Skip special sections */
1095 if (sym->st_shndx >= SHN_LORESERVE)
1096 continue;
1097
1098 secname = secstrings +
1099 sechdrs[sym->st_shndx].sh_name;
1100 if (section(secname))
1101 warn_sec_mismatch(modname, name,
1102 elf, sym, r);
1103 }
1104 }
1105 }
1106 }
1107
1108 /*
1109 * Identify sections from which references to either a
1110 * .init or a .exit section is OK.
1111 *
1112 * [OPD] Keith Ownes <kaos@sgi.com> commented:
1113 * For our future {in}sanity, add a comment that this is the ppc .opd
1114 * section, not the ia64 .opd section.
1115 * ia64 .opd should not point to discarded sections.
1116 * [.rodata] like for .init.text we ignore .rodata references -same reason
1117 */
1118 static int initexit_section_ref_ok(const char *name)
1119 {
1120 const char **s;
1121 /* Absolute section names */
1122 const char *namelist1[] = {
1123 "__bug_table", /* used by powerpc for BUG() */
1124 "__ex_table",
1125 ".altinstructions",
1126 ".cranges", /* used by sh64 */
1127 ".fixup",
1128 ".machvec", /* ia64 + powerpc uses these */
1129 ".machine.desc",
1130 ".opd", /* See comment [OPD] */
1131 "__dbe_table",
1132 ".parainstructions",
1133 ".pdr",
1134 ".plt", /* seen on ARCH=um build on x86_64. Harmless */
1135 ".smp_locks",
1136 ".stab",
1137 ".m68k_fixup",
1138 ".xt.prop", /* xtensa informational section */
1139 ".xt.lit", /* xtensa informational section */
1140 NULL
1141 };
1142 /* Start of section names */
1143 const char *namelist2[] = {
1144 ".debug",
1145 ".eh_frame",
1146 ".note", /* ignore ELF notes - may contain anything */
1147 ".got", /* powerpc - global offset table */
1148 ".toc", /* powerpc - table of contents */
1149 NULL
1150 };
1151 /* part of section name */
1152 const char *namelist3 [] = {
1153 ".unwind", /* Sample: IA_64.unwind.exit.text */
1154 NULL
1155 };
1156
1157 for (s = namelist1; *s; s++)
1158 if (strcmp(*s, name) == 0)
1159 return 1;
1160 for (s = namelist2; *s; s++)
1161 if (strncmp(*s, name, strlen(*s)) == 0)
1162 return 1;
1163 for (s = namelist3; *s; s++)
1164 if (strstr(name, *s) != NULL)
1165 return 1;
1166 return 0;
1167 }
1168
1169
1170 /*
1171 * Identify sections from which references to a .init section is OK.
1172 *
1173 * Unfortunately references to read only data that referenced .init
1174 * sections had to be excluded. Almost all of these are false
1175 * positives, they are created by gcc. The downside of excluding rodata
1176 * is that there really are some user references from rodata to
1177 * init code, e.g. drivers/video/vgacon.c:
1178 *
1179 * const struct consw vga_con = {
1180 * con_startup: vgacon_startup,
1181 *
1182 * where vgacon_startup is __init. If you want to wade through the false
1183 * positives, take out the check for rodata.
1184 */
1185 static int init_section_ref_ok(const char *name)
1186 {
1187 const char **s;
1188 /* Absolute section names */
1189 const char *namelist1[] = {
1190 "__dbe_table", /* MIPS generate these */
1191 "__ftr_fixup", /* powerpc cpu feature fixup */
1192 "__fw_ftr_fixup", /* powerpc firmware feature fixup */
1193 "__param",
1194 ".data.rel.ro", /* used by parisc64 */
1195 ".init",
1196 ".text.lock",
1197 NULL
1198 };
1199 /* Start of section names */
1200 const char *namelist2[] = {
1201 ".init.",
1202 ".pci_fixup",
1203 ".rodata",
1204 NULL
1205 };
1206
1207 if (initexit_section_ref_ok(name))
1208 return 1;
1209
1210 for (s = namelist1; *s; s++)
1211 if (strcmp(*s, name) == 0)
1212 return 1;
1213 for (s = namelist2; *s; s++)
1214 if (strncmp(*s, name, strlen(*s)) == 0)
1215 return 1;
1216
1217 /* If section name ends with ".init" we allow references
1218 * as is the case with .initcallN.init, .early_param.init, .taglist.init etc
1219 */
1220 if (strrcmp(name, ".init") == 0)
1221 return 1;
1222 return 0;
1223 }
1224
1225 /*
1226 * Identify sections from which references to a .exit section is OK.
1227 */
1228 static int exit_section_ref_ok(const char *name)
1229 {
1230 const char **s;
1231 /* Absolute section names */
1232 const char *namelist1[] = {
1233 ".exit.data",
1234 ".exit.text",
1235 ".exitcall.exit",
1236 ".rodata",
1237 NULL
1238 };
1239
1240 if (initexit_section_ref_ok(name))
1241 return 1;
1242
1243 for (s = namelist1; *s; s++)
1244 if (strcmp(*s, name) == 0)
1245 return 1;
1246 return 0;
1247 }
1248
1249 static void read_symbols(char *modname)
1250 {
1251 const char *symname;
1252 char *version;
1253 char *license;
1254 struct module *mod;
1255 struct elf_info info = { };
1256 Elf_Sym *sym;
1257
1258 if (!parse_elf(&info, modname))
1259 return;
1260
1261 mod = new_module(modname);
1262
1263 /* When there's no vmlinux, don't print warnings about
1264 * unresolved symbols (since there'll be too many ;) */
1265 if (is_vmlinux(modname)) {
1266 have_vmlinux = 1;
1267 mod->skip = 1;
1268 }
1269
1270 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1271 while (license) {
1272 if (license_is_gpl_compatible(license))
1273 mod->gpl_compatible = 1;
1274 else {
1275 mod->gpl_compatible = 0;
1276 break;
1277 }
1278 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1279 "license", license);
1280 }
1281
1282 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1283 symname = info.strtab + sym->st_name;
1284
1285 handle_modversions(mod, &info, sym, symname);
1286 handle_moddevtable(mod, &info, sym, symname);
1287 }
1288 if (is_vmlinux(modname) && vmlinux_section_warnings) {
1289 check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
1290 check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
1291 }
1292
1293 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1294 if (version)
1295 maybe_frob_rcs_version(modname, version, info.modinfo,
1296 version - (char *)info.hdr);
1297 if (version || (all_versions && !is_vmlinux(modname)))
1298 get_src_version(modname, mod->srcversion,
1299 sizeof(mod->srcversion)-1);
1300
1301 parse_elf_finish(&info);
1302
1303 /* Our trick to get versioning for struct_module - it's
1304 * never passed as an argument to an exported function, so
1305 * the automatic versioning doesn't pick it up, but it's really
1306 * important anyhow */
1307 if (modversions)
1308 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1309 }
1310
1311 #define SZ 500
1312
1313 /* We first write the generated file into memory using the
1314 * following helper, then compare to the file on disk and
1315 * only update the later if anything changed */
1316
1317 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1318 const char *fmt, ...)
1319 {
1320 char tmp[SZ];
1321 int len;
1322 va_list ap;
1323
1324 va_start(ap, fmt);
1325 len = vsnprintf(tmp, SZ, fmt, ap);
1326 buf_write(buf, tmp, len);
1327 va_end(ap);
1328 }
1329
1330 void buf_write(struct buffer *buf, const char *s, int len)
1331 {
1332 if (buf->size - buf->pos < len) {
1333 buf->size += len + SZ;
1334 buf->p = realloc(buf->p, buf->size);
1335 }
1336 strncpy(buf->p + buf->pos, s, len);
1337 buf->pos += len;
1338 }
1339
1340 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1341 {
1342 const char *e = is_vmlinux(m) ?"":".ko";
1343
1344 switch (exp) {
1345 case export_gpl:
1346 fatal("modpost: GPL-incompatible module %s%s "
1347 "uses GPL-only symbol '%s'\n", m, e, s);
1348 break;
1349 case export_unused_gpl:
1350 fatal("modpost: GPL-incompatible module %s%s "
1351 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1352 break;
1353 case export_gpl_future:
1354 warn("modpost: GPL-incompatible module %s%s "
1355 "uses future GPL-only symbol '%s'\n", m, e, s);
1356 break;
1357 case export_plain:
1358 case export_unused:
1359 case export_unknown:
1360 /* ignore */
1361 break;
1362 }
1363 }
1364
1365 static void check_for_unused(enum export exp, const char* m, const char* s)
1366 {
1367 const char *e = is_vmlinux(m) ?"":".ko";
1368
1369 switch (exp) {
1370 case export_unused:
1371 case export_unused_gpl:
1372 warn("modpost: module %s%s "
1373 "uses symbol '%s' marked UNUSED\n", m, e, s);
1374 break;
1375 default:
1376 /* ignore */
1377 break;
1378 }
1379 }
1380
1381 static void check_exports(struct module *mod)
1382 {
1383 struct symbol *s, *exp;
1384
1385 for (s = mod->unres; s; s = s->next) {
1386 const char *basename;
1387 exp = find_symbol(s->name);
1388 if (!exp || exp->module == mod)
1389 continue;
1390 basename = strrchr(mod->name, '/');
1391 if (basename)
1392 basename++;
1393 else
1394 basename = mod->name;
1395 if (!mod->gpl_compatible)
1396 check_for_gpl_usage(exp->export, basename, exp->name);
1397 check_for_unused(exp->export, basename, exp->name);
1398 }
1399 }
1400
1401 /**
1402 * Header for the generated file
1403 **/
1404 static void add_header(struct buffer *b, struct module *mod)
1405 {
1406 buf_printf(b, "#include <linux/module.h>\n");
1407 buf_printf(b, "#include <linux/vermagic.h>\n");
1408 buf_printf(b, "#include <linux/compiler.h>\n");
1409 buf_printf(b, "\n");
1410 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1411 buf_printf(b, "\n");
1412 buf_printf(b, "struct module __this_module\n");
1413 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1414 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1415 if (mod->has_init)
1416 buf_printf(b, " .init = init_module,\n");
1417 if (mod->has_cleanup)
1418 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1419 " .exit = cleanup_module,\n"
1420 "#endif\n");
1421 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1422 buf_printf(b, "};\n");
1423 }
1424
1425 /**
1426 * Record CRCs for unresolved symbols
1427 **/
1428 static int add_versions(struct buffer *b, struct module *mod)
1429 {
1430 struct symbol *s, *exp;
1431 int err = 0;
1432
1433 for (s = mod->unres; s; s = s->next) {
1434 exp = find_symbol(s->name);
1435 if (!exp || exp->module == mod) {
1436 if (have_vmlinux && !s->weak) {
1437 if (warn_unresolved) {
1438 warn("\"%s\" [%s.ko] undefined!\n",
1439 s->name, mod->name);
1440 } else {
1441 merror("\"%s\" [%s.ko] undefined!\n",
1442 s->name, mod->name);
1443 err = 1;
1444 }
1445 }
1446 continue;
1447 }
1448 s->module = exp->module;
1449 s->crc_valid = exp->crc_valid;
1450 s->crc = exp->crc;
1451 }
1452
1453 if (!modversions)
1454 return err;
1455
1456 buf_printf(b, "\n");
1457 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1458 buf_printf(b, "__attribute_used__\n");
1459 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1460
1461 for (s = mod->unres; s; s = s->next) {
1462 if (!s->module) {
1463 continue;
1464 }
1465 if (!s->crc_valid) {
1466 warn("\"%s\" [%s.ko] has no CRC!\n",
1467 s->name, mod->name);
1468 continue;
1469 }
1470 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1471 }
1472
1473 buf_printf(b, "};\n");
1474
1475 return err;
1476 }
1477
1478 static void add_depends(struct buffer *b, struct module *mod,
1479 struct module *modules)
1480 {
1481 struct symbol *s;
1482 struct module *m;
1483 int first = 1;
1484
1485 for (m = modules; m; m = m->next) {
1486 m->seen = is_vmlinux(m->name);
1487 }
1488
1489 buf_printf(b, "\n");
1490 buf_printf(b, "static const char __module_depends[]\n");
1491 buf_printf(b, "__attribute_used__\n");
1492 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1493 buf_printf(b, "\"depends=");
1494 for (s = mod->unres; s; s = s->next) {
1495 const char *p;
1496 if (!s->module)
1497 continue;
1498
1499 if (s->module->seen)
1500 continue;
1501
1502 s->module->seen = 1;
1503 if ((p = strrchr(s->module->name, '/')) != NULL)
1504 p++;
1505 else
1506 p = s->module->name;
1507 buf_printf(b, "%s%s", first ? "" : ",", p);
1508 first = 0;
1509 }
1510 buf_printf(b, "\";\n");
1511 }
1512
1513 static void add_srcversion(struct buffer *b, struct module *mod)
1514 {
1515 if (mod->srcversion[0]) {
1516 buf_printf(b, "\n");
1517 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1518 mod->srcversion);
1519 }
1520 }
1521
1522 static void write_if_changed(struct buffer *b, const char *fname)
1523 {
1524 char *tmp;
1525 FILE *file;
1526 struct stat st;
1527
1528 file = fopen(fname, "r");
1529 if (!file)
1530 goto write;
1531
1532 if (fstat(fileno(file), &st) < 0)
1533 goto close_write;
1534
1535 if (st.st_size != b->pos)
1536 goto close_write;
1537
1538 tmp = NOFAIL(malloc(b->pos));
1539 if (fread(tmp, 1, b->pos, file) != b->pos)
1540 goto free_write;
1541
1542 if (memcmp(tmp, b->p, b->pos) != 0)
1543 goto free_write;
1544
1545 free(tmp);
1546 fclose(file);
1547 return;
1548
1549 free_write:
1550 free(tmp);
1551 close_write:
1552 fclose(file);
1553 write:
1554 file = fopen(fname, "w");
1555 if (!file) {
1556 perror(fname);
1557 exit(1);
1558 }
1559 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1560 perror(fname);
1561 exit(1);
1562 }
1563 fclose(file);
1564 }
1565
1566 /* parse Module.symvers file. line format:
1567 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1568 **/
1569 static void read_dump(const char *fname, unsigned int kernel)
1570 {
1571 unsigned long size, pos = 0;
1572 void *file = grab_file(fname, &size);
1573 char *line;
1574
1575 if (!file)
1576 /* No symbol versions, silently ignore */
1577 return;
1578
1579 while ((line = get_next_line(&pos, file, size))) {
1580 char *symname, *modname, *d, *export, *end;
1581 unsigned int crc;
1582 struct module *mod;
1583 struct symbol *s;
1584
1585 if (!(symname = strchr(line, '\t')))
1586 goto fail;
1587 *symname++ = '\0';
1588 if (!(modname = strchr(symname, '\t')))
1589 goto fail;
1590 *modname++ = '\0';
1591 if ((export = strchr(modname, '\t')) != NULL)
1592 *export++ = '\0';
1593 if (export && ((end = strchr(export, '\t')) != NULL))
1594 *end = '\0';
1595 crc = strtoul(line, &d, 16);
1596 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1597 goto fail;
1598
1599 if (!(mod = find_module(modname))) {
1600 if (is_vmlinux(modname)) {
1601 have_vmlinux = 1;
1602 }
1603 mod = new_module(NOFAIL(strdup(modname)));
1604 mod->skip = 1;
1605 }
1606 s = sym_add_exported(symname, mod, export_no(export));
1607 s->kernel = kernel;
1608 s->preloaded = 1;
1609 sym_update_crc(symname, mod, crc, export_no(export));
1610 }
1611 return;
1612 fail:
1613 fatal("parse error in symbol dump file\n");
1614 }
1615
1616 /* For normal builds always dump all symbols.
1617 * For external modules only dump symbols
1618 * that are not read from kernel Module.symvers.
1619 **/
1620 static int dump_sym(struct symbol *sym)
1621 {
1622 if (!external_module)
1623 return 1;
1624 if (sym->vmlinux || sym->kernel)
1625 return 0;
1626 return 1;
1627 }
1628
1629 static void write_dump(const char *fname)
1630 {
1631 struct buffer buf = { };
1632 struct symbol *symbol;
1633 int n;
1634
1635 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1636 symbol = symbolhash[n];
1637 while (symbol) {
1638 if (dump_sym(symbol))
1639 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1640 symbol->crc, symbol->name,
1641 symbol->module->name,
1642 export_str(symbol->export));
1643 symbol = symbol->next;
1644 }
1645 }
1646 write_if_changed(&buf, fname);
1647 }
1648
1649 int main(int argc, char **argv)
1650 {
1651 struct module *mod;
1652 struct buffer buf = { };
1653 char fname[SZ];
1654 char *kernel_read = NULL, *module_read = NULL;
1655 char *dump_write = NULL;
1656 int opt;
1657 int err;
1658
1659 while ((opt = getopt(argc, argv, "i:I:mso:aw")) != -1) {
1660 switch(opt) {
1661 case 'i':
1662 kernel_read = optarg;
1663 break;
1664 case 'I':
1665 module_read = optarg;
1666 external_module = 1;
1667 break;
1668 case 'm':
1669 modversions = 1;
1670 break;
1671 case 'o':
1672 dump_write = optarg;
1673 break;
1674 case 'a':
1675 all_versions = 1;
1676 break;
1677 case 's':
1678 vmlinux_section_warnings = 0;
1679 break;
1680 case 'w':
1681 warn_unresolved = 1;
1682 break;
1683 default:
1684 exit(1);
1685 }
1686 }
1687
1688 if (kernel_read)
1689 read_dump(kernel_read, 1);
1690 if (module_read)
1691 read_dump(module_read, 0);
1692
1693 while (optind < argc) {
1694 read_symbols(argv[optind++]);
1695 }
1696
1697 for (mod = modules; mod; mod = mod->next) {
1698 if (mod->skip)
1699 continue;
1700 check_exports(mod);
1701 }
1702
1703 err = 0;
1704
1705 for (mod = modules; mod; mod = mod->next) {
1706 if (mod->skip)
1707 continue;
1708
1709 buf.pos = 0;
1710
1711 add_header(&buf, mod);
1712 err |= add_versions(&buf, mod);
1713 add_depends(&buf, mod, modules);
1714 add_moddevtable(&buf, mod);
1715 add_srcversion(&buf, mod);
1716
1717 sprintf(fname, "%s.mod.c", mod->name);
1718 write_if_changed(&buf, fname);
1719 }
1720
1721 if (dump_write)
1722 write_dump(dump_write);
1723
1724 return err;
1725 }
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