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vt: clean up the code - use kernel library
[linux-2.6.git] / scripts / mod / modpost.c
blob1ce655dde99efd4357db4b62b1a9ff98f0d8fadd
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
6 * Based in part on module-init-tools/depmod.c,file2alias
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * Usage: modpost vmlinux module1.o module2.o ...
12 */
13
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <ctype.h>
17 #include "modpost.h"
18 #include "../../include/generated/autoconf.h"
19 #include "../../include/linux/license.h"
20
21 /* Some toolchains use a `_' prefix for all user symbols. */
22 #ifdef CONFIG_SYMBOL_PREFIX
23 #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
24 #else
25 #define MODULE_SYMBOL_PREFIX ""
26 #endif
27
28
29 /* Are we using CONFIG_MODVERSIONS? */
30 int modversions = 0;
31 /* Warn about undefined symbols? (do so if we have vmlinux) */
32 int have_vmlinux = 0;
33 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
34 static int all_versions = 0;
35 /* If we are modposting external module set to 1 */
36 static int external_module = 0;
37 /* Warn about section mismatch in vmlinux if set to 1 */
38 static int vmlinux_section_warnings = 1;
39 /* Only warn about unresolved symbols */
40 static int warn_unresolved = 0;
41 /* How a symbol is exported */
42 static int sec_mismatch_count = 0;
43 static int sec_mismatch_verbose = 1;
44
45 enum export {
46 export_plain, export_unused, export_gpl,
47 export_unused_gpl, export_gpl_future, export_unknown
48 };
49
50 #define PRINTF __attribute__ ((format (printf, 1, 2)))
51
52 PRINTF void fatal(const char *fmt, ...)
53 {
54 va_list arglist;
55
56 fprintf(stderr, "FATAL: ");
57
58 va_start(arglist, fmt);
59 vfprintf(stderr, fmt, arglist);
60 va_end(arglist);
61
62 exit(1);
63 }
64
65 PRINTF void warn(const char *fmt, ...)
66 {
67 va_list arglist;
68
69 fprintf(stderr, "WARNING: ");
70
71 va_start(arglist, fmt);
72 vfprintf(stderr, fmt, arglist);
73 va_end(arglist);
74 }
75
76 PRINTF void merror(const char *fmt, ...)
77 {
78 va_list arglist;
79
80 fprintf(stderr, "ERROR: ");
81
82 va_start(arglist, fmt);
83 vfprintf(stderr, fmt, arglist);
84 va_end(arglist);
85 }
86
87 static int is_vmlinux(const char *modname)
88 {
89 const char *myname;
90
91 myname = strrchr(modname, '/');
92 if (myname)
93 myname++;
94 else
95 myname = modname;
96
97 return (strcmp(myname, "vmlinux") == 0) ||
98 (strcmp(myname, "vmlinux.o") == 0);
99 }
100
101 void *do_nofail(void *ptr, const char *expr)
102 {
103 if (!ptr)
104 fatal("modpost: Memory allocation failure: %s.\n", expr);
105
106 return ptr;
107 }
108
109 /* A list of all modules we processed */
110 static struct module *modules;
111
112 static struct module *find_module(char *modname)
113 {
114 struct module *mod;
115
116 for (mod = modules; mod; mod = mod->next)
117 if (strcmp(mod->name, modname) == 0)
118 break;
119 return mod;
120 }
121
122 static struct module *new_module(char *modname)
123 {
124 struct module *mod;
125 char *p, *s;
126
127 mod = NOFAIL(malloc(sizeof(*mod)));
128 memset(mod, 0, sizeof(*mod));
129 p = NOFAIL(strdup(modname));
130
131 /* strip trailing .o */
132 s = strrchr(p, '.');
133 if (s != NULL)
134 if (strcmp(s, ".o") == 0)
135 *s = '\0';
136
137 /* add to list */
138 mod->name = p;
139 mod->gpl_compatible = -1;
140 mod->next = modules;
141 modules = mod;
142
143 return mod;
144 }
145
146 /* A hash of all exported symbols,
147 * struct symbol is also used for lists of unresolved symbols */
148
149 #define SYMBOL_HASH_SIZE 1024
150
151 struct symbol {
152 struct symbol *next;
153 struct module *module;
154 unsigned int crc;
155 int crc_valid;
156 unsigned int weak:1;
157 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
158 unsigned int kernel:1; /* 1 if symbol is from kernel
159 * (only for external modules) **/
160 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
161 enum export export; /* Type of export */
162 char name[0];
163 };
164
165 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
166
167 /* This is based on the hash agorithm from gdbm, via tdb */
168 static inline unsigned int tdb_hash(const char *name)
169 {
170 unsigned value; /* Used to compute the hash value. */
171 unsigned i; /* Used to cycle through random values. */
172
173 /* Set the initial value from the key size. */
174 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
175 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
176
177 return (1103515243 * value + 12345);
178 }
179
180 /**
181 * Allocate a new symbols for use in the hash of exported symbols or
182 * the list of unresolved symbols per module
183 **/
184 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
185 struct symbol *next)
186 {
187 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
188
189 memset(s, 0, sizeof(*s));
190 strcpy(s->name, name);
191 s->weak = weak;
192 s->next = next;
193 return s;
194 }
195
196 /* For the hash of exported symbols */
197 static struct symbol *new_symbol(const char *name, struct module *module,
198 enum export export)
199 {
200 unsigned int hash;
201 struct symbol *new;
202
203 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
204 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
205 new->module = module;
206 new->export = export;
207 return new;
208 }
209
210 static struct symbol *find_symbol(const char *name)
211 {
212 struct symbol *s;
213
214 /* For our purposes, .foo matches foo. PPC64 needs this. */
215 if (name[0] == '.')
216 name++;
217
218 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
219 if (strcmp(s->name, name) == 0)
220 return s;
221 }
222 return NULL;
223 }
224
225 static struct {
226 const char *str;
227 enum export export;
228 } export_list[] = {
229 { .str = "EXPORT_SYMBOL", .export = export_plain },
230 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
231 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
232 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
233 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
234 { .str = "(unknown)", .export = export_unknown },
235 };
236
237
238 static const char *export_str(enum export ex)
239 {
240 return export_list[ex].str;
241 }
242
243 static enum export export_no(const char *s)
244 {
245 int i;
246
247 if (!s)
248 return export_unknown;
249 for (i = 0; export_list[i].export != export_unknown; i++) {
250 if (strcmp(export_list[i].str, s) == 0)
251 return export_list[i].export;
252 }
253 return export_unknown;
254 }
255
256 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
257 {
258 if (sec == elf->export_sec)
259 return export_plain;
260 else if (sec == elf->export_unused_sec)
261 return export_unused;
262 else if (sec == elf->export_gpl_sec)
263 return export_gpl;
264 else if (sec == elf->export_unused_gpl_sec)
265 return export_unused_gpl;
266 else if (sec == elf->export_gpl_future_sec)
267 return export_gpl_future;
268 else
269 return export_unknown;
270 }
271
272 /**
273 * Add an exported symbol - it may have already been added without a
274 * CRC, in this case just update the CRC
275 **/
276 static struct symbol *sym_add_exported(const char *name, struct module *mod,
277 enum export export)
278 {
279 struct symbol *s = find_symbol(name);
280
281 if (!s) {
282 s = new_symbol(name, mod, export);
283 } else {
284 if (!s->preloaded) {
285 warn("%s: '%s' exported twice. Previous export "
286 "was in %s%s\n", mod->name, name,
287 s->module->name,
288 is_vmlinux(s->module->name) ?"":".ko");
289 } else {
290 /* In case Modules.symvers was out of date */
291 s->module = mod;
292 }
293 }
294 s->preloaded = 0;
295 s->vmlinux = is_vmlinux(mod->name);
296 s->kernel = 0;
297 s->export = export;
298 return s;
299 }
300
301 static void sym_update_crc(const char *name, struct module *mod,
302 unsigned int crc, enum export export)
303 {
304 struct symbol *s = find_symbol(name);
305
306 if (!s)
307 s = new_symbol(name, mod, export);
308 s->crc = crc;
309 s->crc_valid = 1;
310 }
311
312 void *grab_file(const char *filename, unsigned long *size)
313 {
314 struct stat st;
315 void *map;
316 int fd;
317
318 fd = open(filename, O_RDONLY);
319 if (fd < 0 || fstat(fd, &st) != 0)
320 return NULL;
321
322 *size = st.st_size;
323 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
324 close(fd);
325
326 if (map == MAP_FAILED)
327 return NULL;
328 return map;
329 }
330
331 /**
332 * Return a copy of the next line in a mmap'ed file.
333 * spaces in the beginning of the line is trimmed away.
334 * Return a pointer to a static buffer.
335 **/
336 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
337 {
338 static char line[4096];
339 int skip = 1;
340 size_t len = 0;
341 signed char *p = (signed char *)file + *pos;
342 char *s = line;
343
344 for (; *pos < size ; (*pos)++) {
345 if (skip && isspace(*p)) {
346 p++;
347 continue;
348 }
349 skip = 0;
350 if (*p != '\n' && (*pos < size)) {
351 len++;
352 *s++ = *p++;
353 if (len > 4095)
354 break; /* Too long, stop */
355 } else {
356 /* End of string */
357 *s = '\0';
358 return line;
359 }
360 }
361 /* End of buffer */
362 return NULL;
363 }
364
365 void release_file(void *file, unsigned long size)
366 {
367 munmap(file, size);
368 }
369
370 static int parse_elf(struct elf_info *info, const char *filename)
371 {
372 unsigned int i;
373 Elf_Ehdr *hdr;
374 Elf_Shdr *sechdrs;
375 Elf_Sym *sym;
376 const char *secstrings;
377 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
378
379 hdr = grab_file(filename, &info->size);
380 if (!hdr) {
381 perror(filename);
382 exit(1);
383 }
384 info->hdr = hdr;
385 if (info->size < sizeof(*hdr)) {
386 /* file too small, assume this is an empty .o file */
387 return 0;
388 }
389 /* Is this a valid ELF file? */
390 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
391 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
392 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
393 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
394 /* Not an ELF file - silently ignore it */
395 return 0;
396 }
397 /* Fix endianness in ELF header */
398 hdr->e_type = TO_NATIVE(hdr->e_type);
399 hdr->e_machine = TO_NATIVE(hdr->e_machine);
400 hdr->e_version = TO_NATIVE(hdr->e_version);
401 hdr->e_entry = TO_NATIVE(hdr->e_entry);
402 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
403 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
404 hdr->e_flags = TO_NATIVE(hdr->e_flags);
405 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
406 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
407 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
408 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
409 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
410 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
411 sechdrs = (void *)hdr + hdr->e_shoff;
412 info->sechdrs = sechdrs;
413
414 /* Check if file offset is correct */
415 if (hdr->e_shoff > info->size) {
416 fatal("section header offset=%lu in file '%s' is bigger than "
417 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
418 filename, info->size);
419 return 0;
420 }
421
422 if (hdr->e_shnum == 0) {
423 /*
424 * There are more than 64k sections,
425 * read count from .sh_size.
426 * note: it doesn't need shndx2secindex()
427 */
428 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
429 }
430 else {
431 info->num_sections = hdr->e_shnum;
432 }
433 if (hdr->e_shstrndx == SHN_XINDEX) {
434 info->secindex_strings =
435 shndx2secindex(TO_NATIVE(sechdrs[0].sh_link));
436 }
437 else {
438 info->secindex_strings = hdr->e_shstrndx;
439 }
440
441 /* Fix endianness in section headers */
442 for (i = 0; i < info->num_sections; i++) {
443 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
444 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
445 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
446 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
447 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
448 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
449 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
450 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
451 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
452 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
453 }
454 /* Find symbol table. */
455 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
456 for (i = 1; i < info->num_sections; i++) {
457 const char *secname;
458 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
459
460 if (!nobits && sechdrs[i].sh_offset > info->size) {
461 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
462 "sizeof(*hrd)=%zu\n", filename,
463 (unsigned long)sechdrs[i].sh_offset,
464 sizeof(*hdr));
465 return 0;
466 }
467 secname = secstrings + sechdrs[i].sh_name;
468 if (strcmp(secname, ".modinfo") == 0) {
469 if (nobits)
470 fatal("%s has NOBITS .modinfo\n", filename);
471 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
472 info->modinfo_len = sechdrs[i].sh_size;
473 } else if (strcmp(secname, "__ksymtab") == 0)
474 info->export_sec = i;
475 else if (strcmp(secname, "__ksymtab_unused") == 0)
476 info->export_unused_sec = i;
477 else if (strcmp(secname, "__ksymtab_gpl") == 0)
478 info->export_gpl_sec = i;
479 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
480 info->export_unused_gpl_sec = i;
481 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
482 info->export_gpl_future_sec = i;
483
484 if (sechdrs[i].sh_type == SHT_SYMTAB) {
485 unsigned int sh_link_idx;
486 symtab_idx = i;
487 info->symtab_start = (void *)hdr +
488 sechdrs[i].sh_offset;
489 info->symtab_stop = (void *)hdr +
490 sechdrs[i].sh_offset + sechdrs[i].sh_size;
491 sh_link_idx = shndx2secindex(sechdrs[i].sh_link);
492 info->strtab = (void *)hdr +
493 sechdrs[sh_link_idx].sh_offset;
494 }
495
496 /* 32bit section no. table? ("more than 64k sections") */
497 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
498 symtab_shndx_idx = i;
499 info->symtab_shndx_start = (void *)hdr +
500 sechdrs[i].sh_offset;
501 info->symtab_shndx_stop = (void *)hdr +
502 sechdrs[i].sh_offset + sechdrs[i].sh_size;
503 }
504 }
505 if (!info->symtab_start)
506 fatal("%s has no symtab?\n", filename);
507
508 /* Fix endianness in symbols */
509 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
510 sym->st_shndx = TO_NATIVE(sym->st_shndx);
511 sym->st_name = TO_NATIVE(sym->st_name);
512 sym->st_value = TO_NATIVE(sym->st_value);
513 sym->st_size = TO_NATIVE(sym->st_size);
514 }
515
516 if (symtab_shndx_idx != ~0U) {
517 Elf32_Word *p;
518 if (symtab_idx !=
519 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link))
520 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
521 filename,
522 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link),
523 symtab_idx);
524 /* Fix endianness */
525 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
526 p++)
527 *p = TO_NATIVE(*p);
528 }
529
530 return 1;
531 }
532
533 static void parse_elf_finish(struct elf_info *info)
534 {
535 release_file(info->hdr, info->size);
536 }
537
538 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
539 {
540 /* ignore __this_module, it will be resolved shortly */
541 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
542 return 1;
543 /* ignore global offset table */
544 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
545 return 1;
546 if (info->hdr->e_machine == EM_PPC)
547 /* Special register function linked on all modules during final link of .ko */
548 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
549 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
550 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
551 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
552 return 1;
553 if (info->hdr->e_machine == EM_PPC64)
554 /* Special register function linked on all modules during final link of .ko */
555 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
556 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
557 return 1;
558 /* Do not ignore this symbol */
559 return 0;
560 }
561
562 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
563 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
564
565 static void handle_modversions(struct module *mod, struct elf_info *info,
566 Elf_Sym *sym, const char *symname)
567 {
568 unsigned int crc;
569 enum export export = export_from_sec(info, get_secindex(info, sym));
570
571 switch (sym->st_shndx) {
572 case SHN_COMMON:
573 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
574 break;
575 case SHN_ABS:
576 /* CRC'd symbol */
577 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
578 crc = (unsigned int) sym->st_value;
579 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
580 export);
581 }
582 break;
583 case SHN_UNDEF:
584 /* undefined symbol */
585 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
586 ELF_ST_BIND(sym->st_info) != STB_WEAK)
587 break;
588 if (ignore_undef_symbol(info, symname))
589 break;
590 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
591 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
592 /* add compatibility with older glibc */
593 #ifndef STT_SPARC_REGISTER
594 #define STT_SPARC_REGISTER STT_REGISTER
595 #endif
596 if (info->hdr->e_machine == EM_SPARC ||
597 info->hdr->e_machine == EM_SPARCV9) {
598 /* Ignore register directives. */
599 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
600 break;
601 if (symname[0] == '.') {
602 char *munged = strdup(symname);
603 munged[0] = '_';
604 munged[1] = toupper(munged[1]);
605 symname = munged;
606 }
607 }
608 #endif
609
610 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
611 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
612 mod->unres =
613 alloc_symbol(symname +
614 strlen(MODULE_SYMBOL_PREFIX),
615 ELF_ST_BIND(sym->st_info) == STB_WEAK,
616 mod->unres);
617 }
618 break;
619 default:
620 /* All exported symbols */
621 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
622 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
623 export);
624 }
625 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
626 mod->has_init = 1;
627 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
628 mod->has_cleanup = 1;
629 break;
630 }
631 }
632
633 /**
634 * Parse tag=value strings from .modinfo section
635 **/
636 static char *next_string(char *string, unsigned long *secsize)
637 {
638 /* Skip non-zero chars */
639 while (string[0]) {
640 string++;
641 if ((*secsize)-- <= 1)
642 return NULL;
643 }
644
645 /* Skip any zero padding. */
646 while (!string[0]) {
647 string++;
648 if ((*secsize)-- <= 1)
649 return NULL;
650 }
651 return string;
652 }
653
654 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
655 const char *tag, char *info)
656 {
657 char *p;
658 unsigned int taglen = strlen(tag);
659 unsigned long size = modinfo_len;
660
661 if (info) {
662 size -= info - (char *)modinfo;
663 modinfo = next_string(info, &size);
664 }
665
666 for (p = modinfo; p; p = next_string(p, &size)) {
667 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
668 return p + taglen + 1;
669 }
670 return NULL;
671 }
672
673 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
674 const char *tag)
675
676 {
677 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
678 }
679
680 /**
681 * Test if string s ends in string sub
682 * return 0 if match
683 **/
684 static int strrcmp(const char *s, const char *sub)
685 {
686 int slen, sublen;
687
688 if (!s || !sub)
689 return 1;
690
691 slen = strlen(s);
692 sublen = strlen(sub);
693
694 if ((slen == 0) || (sublen == 0))
695 return 1;
696
697 if (sublen > slen)
698 return 1;
699
700 return memcmp(s + slen - sublen, sub, sublen);
701 }
702
703 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
704 {
705 if (sym)
706 return elf->strtab + sym->st_name;
707 else
708 return "(unknown)";
709 }
710
711 static const char *sec_name(struct elf_info *elf, int secindex)
712 {
713 Elf_Shdr *sechdrs = elf->sechdrs;
714 return (void *)elf->hdr +
715 elf->sechdrs[elf->secindex_strings].sh_offset +
716 sechdrs[secindex].sh_name;
717 }
718
719 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
720 {
721 return (void *)elf->hdr +
722 elf->sechdrs[elf->secindex_strings].sh_offset +
723 sechdr->sh_name;
724 }
725
726 /* if sym is empty or point to a string
727 * like ".[0-9]+" then return 1.
728 * This is the optional prefix added by ld to some sections
729 */
730 static int number_prefix(const char *sym)
731 {
732 if (*sym++ == '\0')
733 return 1;
734 if (*sym != '.')
735 return 0;
736 do {
737 char c = *sym++;
738 if (c < '0' || c > '9')
739 return 0;
740 } while (*sym);
741 return 1;
742 }
743
744 /* The pattern is an array of simple patterns.
745 * "foo" will match an exact string equal to "foo"
746 * "*foo" will match a string that ends with "foo"
747 * "foo*" will match a string that begins with "foo"
748 * "foo$" will match a string equal to "foo" or "foo.1"
749 * where the '1' can be any number including several digits.
750 * The $ syntax is for sections where ld append a dot number
751 * to make section name unique.
752 */
753 static int match(const char *sym, const char * const pat[])
754 {
755 const char *p;
756 while (*pat) {
757 p = *pat++;
758 const char *endp = p + strlen(p) - 1;
759
760 /* "*foo" */
761 if (*p == '*') {
762 if (strrcmp(sym, p + 1) == 0)
763 return 1;
764 }
765 /* "foo*" */
766 else if (*endp == '*') {
767 if (strncmp(sym, p, strlen(p) - 1) == 0)
768 return 1;
769 }
770 /* "foo$" */
771 else if (*endp == '$') {
772 if (strncmp(sym, p, strlen(p) - 1) == 0) {
773 if (number_prefix(sym + strlen(p) - 1))
774 return 1;
775 }
776 }
777 /* no wildcards */
778 else {
779 if (strcmp(p, sym) == 0)
780 return 1;
781 }
782 }
783 /* no match */
784 return 0;
785 }
786
787 /* sections that we do not want to do full section mismatch check on */
788 static const char *section_white_list[] =
789 {
790 ".comment*",
791 ".debug*",
792 ".mdebug*", /* alpha, score, mips etc. */
793 ".pdr", /* alpha, score, mips etc. */
794 ".stab*",
795 ".note*",
796 ".got*",
797 ".toc*",
798 NULL
799 };
800
801 /*
802 * This is used to find sections missing the SHF_ALLOC flag.
803 * The cause of this is often a section specified in assembler
804 * without "ax" / "aw".
805 */
806 static void check_section(const char *modname, struct elf_info *elf,
807 Elf_Shdr *sechdr)
808 {
809 const char *sec = sech_name(elf, sechdr);
810
811 if (sechdr->sh_type == SHT_PROGBITS &&
812 !(sechdr->sh_flags & SHF_ALLOC) &&
813 !match(sec, section_white_list)) {
814 warn("%s (%s): unexpected non-allocatable section.\n"
815 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
816 "Note that for example <linux/init.h> contains\n"
817 "section definitions for use in .S files.\n\n",
818 modname, sec);
819 }
820 }
821
822
823
824 #define ALL_INIT_DATA_SECTIONS \
825 ".init.setup$", ".init.rodata$", \
826 ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \
827 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
828 #define ALL_EXIT_DATA_SECTIONS \
829 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
830
831 #define ALL_INIT_TEXT_SECTIONS \
832 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
833 #define ALL_EXIT_TEXT_SECTIONS \
834 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
835
836 #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \
837 MEM_INIT_SECTIONS
838 #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \
839 MEM_EXIT_SECTIONS
840
841 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
842 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
843
844 #define DATA_SECTIONS ".data$", ".data.rel$"
845 #define TEXT_SECTIONS ".text$"
846
847 #define INIT_SECTIONS ".init.*"
848 #define DEV_INIT_SECTIONS ".devinit.*"
849 #define CPU_INIT_SECTIONS ".cpuinit.*"
850 #define MEM_INIT_SECTIONS ".meminit.*"
851
852 #define EXIT_SECTIONS ".exit.*"
853 #define DEV_EXIT_SECTIONS ".devexit.*"
854 #define CPU_EXIT_SECTIONS ".cpuexit.*"
855 #define MEM_EXIT_SECTIONS ".memexit.*"
856
857 /* init data sections */
858 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
859
860 /* all init sections */
861 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
862
863 /* All init and exit sections (code + data) */
864 static const char *init_exit_sections[] =
865 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
866
867 /* data section */
868 static const char *data_sections[] = { DATA_SECTIONS, NULL };
869
870
871 /* symbols in .data that may refer to init/exit sections */
872 #define DEFAULT_SYMBOL_WHITE_LIST \
873 "*driver", \
874 "*_template", /* scsi uses *_template a lot */ \
875 "*_timer", /* arm uses ops structures named _timer a lot */ \
876 "*_sht", /* scsi also used *_sht to some extent */ \
877 "*_ops", \
878 "*_probe", \
879 "*_probe_one", \
880 "*_console"
881
882 static const char *head_sections[] = { ".head.text*", NULL };
883 static const char *linker_symbols[] =
884 { "__init_begin", "_sinittext", "_einittext", NULL };
885
886 enum mismatch {
887 TEXT_TO_ANY_INIT,
888 DATA_TO_ANY_INIT,
889 TEXT_TO_ANY_EXIT,
890 DATA_TO_ANY_EXIT,
891 XXXINIT_TO_SOME_INIT,
892 XXXEXIT_TO_SOME_EXIT,
893 ANY_INIT_TO_ANY_EXIT,
894 ANY_EXIT_TO_ANY_INIT,
895 EXPORT_TO_INIT_EXIT,
896 };
897
898 struct sectioncheck {
899 const char *fromsec[20];
900 const char *tosec[20];
901 enum mismatch mismatch;
902 const char *symbol_white_list[20];
903 };
904
905 const struct sectioncheck sectioncheck[] = {
906 /* Do not reference init/exit code/data from
907 * normal code and data
908 */
909 {
910 .fromsec = { TEXT_SECTIONS, NULL },
911 .tosec = { ALL_INIT_SECTIONS, NULL },
912 .mismatch = TEXT_TO_ANY_INIT,
913 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
914 },
915 {
916 .fromsec = { DATA_SECTIONS, NULL },
917 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
918 .mismatch = DATA_TO_ANY_INIT,
919 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
920 },
921 {
922 .fromsec = { DATA_SECTIONS, NULL },
923 .tosec = { INIT_SECTIONS, NULL },
924 .mismatch = DATA_TO_ANY_INIT,
925 .symbol_white_list = {
926 "*_template", "*_timer", "*_sht", "*_ops",
927 "*_probe", "*_probe_one", "*_console", NULL
928 },
929 },
930 {
931 .fromsec = { TEXT_SECTIONS, NULL },
932 .tosec = { ALL_EXIT_SECTIONS, NULL },
933 .mismatch = TEXT_TO_ANY_EXIT,
934 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
935 },
936 {
937 .fromsec = { DATA_SECTIONS, NULL },
938 .tosec = { ALL_EXIT_SECTIONS, NULL },
939 .mismatch = DATA_TO_ANY_EXIT,
940 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
941 },
942 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
943 {
944 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
945 .tosec = { INIT_SECTIONS, NULL },
946 .mismatch = XXXINIT_TO_SOME_INIT,
947 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
948 },
949 /* Do not reference cpuinit code/data from meminit code/data */
950 {
951 .fromsec = { MEM_INIT_SECTIONS, NULL },
952 .tosec = { CPU_INIT_SECTIONS, NULL },
953 .mismatch = XXXINIT_TO_SOME_INIT,
954 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
955 },
956 /* Do not reference meminit code/data from cpuinit code/data */
957 {
958 .fromsec = { CPU_INIT_SECTIONS, NULL },
959 .tosec = { MEM_INIT_SECTIONS, NULL },
960 .mismatch = XXXINIT_TO_SOME_INIT,
961 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
962 },
963 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
964 {
965 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
966 .tosec = { EXIT_SECTIONS, NULL },
967 .mismatch = XXXEXIT_TO_SOME_EXIT,
968 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
969 },
970 /* Do not reference cpuexit code/data from memexit code/data */
971 {
972 .fromsec = { MEM_EXIT_SECTIONS, NULL },
973 .tosec = { CPU_EXIT_SECTIONS, NULL },
974 .mismatch = XXXEXIT_TO_SOME_EXIT,
975 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
976 },
977 /* Do not reference memexit code/data from cpuexit code/data */
978 {
979 .fromsec = { CPU_EXIT_SECTIONS, NULL },
980 .tosec = { MEM_EXIT_SECTIONS, NULL },
981 .mismatch = XXXEXIT_TO_SOME_EXIT,
982 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
983 },
984 /* Do not use exit code/data from init code */
985 {
986 .fromsec = { ALL_INIT_SECTIONS, NULL },
987 .tosec = { ALL_EXIT_SECTIONS, NULL },
988 .mismatch = ANY_INIT_TO_ANY_EXIT,
989 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
990 },
991 /* Do not use init code/data from exit code */
992 {
993 .fromsec = { ALL_EXIT_SECTIONS, NULL },
994 .tosec = { ALL_INIT_SECTIONS, NULL },
995 .mismatch = ANY_EXIT_TO_ANY_INIT,
996 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
997 },
998 /* Do not export init/exit functions or data */
999 {
1000 .fromsec = { "__ksymtab*", NULL },
1001 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1002 .mismatch = EXPORT_TO_INIT_EXIT,
1003 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1004 }
1005 };
1006
1007 static const struct sectioncheck *section_mismatch(
1008 const char *fromsec, const char *tosec)
1009 {
1010 int i;
1011 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1012 const struct sectioncheck *check = &sectioncheck[0];
1013
1014 for (i = 0; i < elems; i++) {
1015 if (match(fromsec, check->fromsec) &&
1016 match(tosec, check->tosec))
1017 return check;
1018 check++;
1019 }
1020 return NULL;
1021 }
1022
1023 /**
1024 * Whitelist to allow certain references to pass with no warning.
1025 *
1026 * Pattern 1:
1027 * If a module parameter is declared __initdata and permissions=0
1028 * then this is legal despite the warning generated.
1029 * We cannot see value of permissions here, so just ignore
1030 * this pattern.
1031 * The pattern is identified by:
1032 * tosec = .init.data
1033 * fromsec = .data*
1034 * atsym =__param*
1035 *
1036 * Pattern 2:
1037 * Many drivers utilise a *driver container with references to
1038 * add, remove, probe functions etc.
1039 * These functions may often be marked __devinit and we do not want to
1040 * warn here.
1041 * the pattern is identified by:
1042 * tosec = init or exit section
1043 * fromsec = data section
1044 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1045 * *probe_one, *_console, *_timer
1046 *
1047 * Pattern 3:
1048 * Whitelist all references from .head.text to any init section
1049 *
1050 * Pattern 4:
1051 * Some symbols belong to init section but still it is ok to reference
1052 * these from non-init sections as these symbols don't have any memory
1053 * allocated for them and symbol address and value are same. So even
1054 * if init section is freed, its ok to reference those symbols.
1055 * For ex. symbols marking the init section boundaries.
1056 * This pattern is identified by
1057 * refsymname = __init_begin, _sinittext, _einittext
1058 *
1059 **/
1060 static int secref_whitelist(const struct sectioncheck *mismatch,
1061 const char *fromsec, const char *fromsym,
1062 const char *tosec, const char *tosym)
1063 {
1064 /* Check for pattern 1 */
1065 if (match(tosec, init_data_sections) &&
1066 match(fromsec, data_sections) &&
1067 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1068 return 0;
1069
1070 /* Check for pattern 2 */
1071 if (match(tosec, init_exit_sections) &&
1072 match(fromsec, data_sections) &&
1073 match(fromsym, mismatch->symbol_white_list))
1074 return 0;
1075
1076 /* Check for pattern 3 */
1077 if (match(fromsec, head_sections) &&
1078 match(tosec, init_sections))
1079 return 0;
1080
1081 /* Check for pattern 4 */
1082 if (match(tosym, linker_symbols))
1083 return 0;
1084
1085 return 1;
1086 }
1087
1088 /**
1089 * Find symbol based on relocation record info.
1090 * In some cases the symbol supplied is a valid symbol so
1091 * return refsym. If st_name != 0 we assume this is a valid symbol.
1092 * In other cases the symbol needs to be looked up in the symbol table
1093 * based on section and address.
1094 * **/
1095 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1096 Elf_Sym *relsym)
1097 {
1098 Elf_Sym *sym;
1099 Elf_Sym *near = NULL;
1100 Elf64_Sword distance = 20;
1101 Elf64_Sword d;
1102 unsigned int relsym_secindex;
1103
1104 if (relsym->st_name != 0)
1105 return relsym;
1106
1107 relsym_secindex = get_secindex(elf, relsym);
1108 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1109 if (get_secindex(elf, sym) != relsym_secindex)
1110 continue;
1111 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1112 continue;
1113 if (sym->st_value == addr)
1114 return sym;
1115 /* Find a symbol nearby - addr are maybe negative */
1116 d = sym->st_value - addr;
1117 if (d < 0)
1118 d = addr - sym->st_value;
1119 if (d < distance) {
1120 distance = d;
1121 near = sym;
1122 }
1123 }
1124 /* We need a close match */
1125 if (distance < 20)
1126 return near;
1127 else
1128 return NULL;
1129 }
1130
1131 static inline int is_arm_mapping_symbol(const char *str)
1132 {
1133 return str[0] == '$' && strchr("atd", str[1])
1134 && (str[2] == '\0' || str[2] == '.');
1135 }
1136
1137 /*
1138 * If there's no name there, ignore it; likewise, ignore it if it's
1139 * one of the magic symbols emitted used by current ARM tools.
1140 *
1141 * Otherwise if find_symbols_between() returns those symbols, they'll
1142 * fail the whitelist tests and cause lots of false alarms ... fixable
1143 * only by merging __exit and __init sections into __text, bloating
1144 * the kernel (which is especially evil on embedded platforms).
1145 */
1146 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1147 {
1148 const char *name = elf->strtab + sym->st_name;
1149
1150 if (!name || !strlen(name))
1151 return 0;
1152 return !is_arm_mapping_symbol(name);
1153 }
1154
1155 /*
1156 * Find symbols before or equal addr and after addr - in the section sec.
1157 * If we find two symbols with equal offset prefer one with a valid name.
1158 * The ELF format may have a better way to detect what type of symbol
1159 * it is, but this works for now.
1160 **/
1161 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1162 const char *sec)
1163 {
1164 Elf_Sym *sym;
1165 Elf_Sym *near = NULL;
1166 Elf_Addr distance = ~0;
1167
1168 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1169 const char *symsec;
1170
1171 if (is_shndx_special(sym->st_shndx))
1172 continue;
1173 symsec = sec_name(elf, get_secindex(elf, sym));
1174 if (strcmp(symsec, sec) != 0)
1175 continue;
1176 if (!is_valid_name(elf, sym))
1177 continue;
1178 if (sym->st_value <= addr) {
1179 if ((addr - sym->st_value) < distance) {
1180 distance = addr - sym->st_value;
1181 near = sym;
1182 } else if ((addr - sym->st_value) == distance) {
1183 near = sym;
1184 }
1185 }
1186 }
1187 return near;
1188 }
1189
1190 /*
1191 * Convert a section name to the function/data attribute
1192 * .init.text => __init
1193 * .cpuinit.data => __cpudata
1194 * .memexitconst => __memconst
1195 * etc.
1196 */
1197 static char *sec2annotation(const char *s)
1198 {
1199 if (match(s, init_exit_sections)) {
1200 char *p = malloc(20);
1201 char *r = p;
1202
1203 *p++ = '_';
1204 *p++ = '_';
1205 if (*s == '.')
1206 s++;
1207 while (*s && *s != '.')
1208 *p++ = *s++;
1209 *p = '\0';
1210 if (*s == '.')
1211 s++;
1212 if (strstr(s, "rodata") != NULL)
1213 strcat(p, "const ");
1214 else if (strstr(s, "data") != NULL)
1215 strcat(p, "data ");
1216 else
1217 strcat(p, " ");
1218 return r; /* we leak her but we do not care */
1219 } else {
1220 return "";
1221 }
1222 }
1223
1224 static int is_function(Elf_Sym *sym)
1225 {
1226 if (sym)
1227 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1228 else
1229 return -1;
1230 }
1231
1232 /*
1233 * Print a warning about a section mismatch.
1234 * Try to find symbols near it so user can find it.
1235 * Check whitelist before warning - it may be a false positive.
1236 */
1237 static void report_sec_mismatch(const char *modname,
1238 const struct sectioncheck *mismatch,
1239 const char *fromsec,
1240 unsigned long long fromaddr,
1241 const char *fromsym,
1242 int from_is_func,
1243 const char *tosec, const char *tosym,
1244 int to_is_func)
1245 {
1246 const char *from, *from_p;
1247 const char *to, *to_p;
1248 char *prl_from;
1249 char *prl_to;
1250
1251 switch (from_is_func) {
1252 case 0: from = "variable"; from_p = ""; break;
1253 case 1: from = "function"; from_p = "()"; break;
1254 default: from = "(unknown reference)"; from_p = ""; break;
1255 }
1256 switch (to_is_func) {
1257 case 0: to = "variable"; to_p = ""; break;
1258 case 1: to = "function"; to_p = "()"; break;
1259 default: to = "(unknown reference)"; to_p = ""; break;
1260 }
1261
1262 sec_mismatch_count++;
1263 if (!sec_mismatch_verbose)
1264 return;
1265
1266 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1267 "to the %s %s:%s%s\n",
1268 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1269 tosym, to_p);
1270
1271 switch (mismatch->mismatch) {
1272 case TEXT_TO_ANY_INIT:
1273 prl_from = sec2annotation(fromsec);
1274 prl_to = sec2annotation(tosec);
1275 fprintf(stderr,
1276 "The function %s%s() references\n"
1277 "the %s %s%s%s.\n"
1278 "This is often because %s lacks a %s\n"
1279 "annotation or the annotation of %s is wrong.\n",
1280 prl_from, fromsym,
1281 to, prl_to, tosym, to_p,
1282 fromsym, prl_to, tosym);
1283 free(prl_from);
1284 free(prl_to);
1285 break;
1286 case DATA_TO_ANY_INIT: {
1287 prl_to = sec2annotation(tosec);
1288 const char *const *s = mismatch->symbol_white_list;
1289 fprintf(stderr,
1290 "The variable %s references\n"
1291 "the %s %s%s%s\n"
1292 "If the reference is valid then annotate the\n"
1293 "variable with __init* or __refdata (see linux/init.h) "
1294 "or name the variable:\n",
1295 fromsym, to, prl_to, tosym, to_p);
1296 while (*s)
1297 fprintf(stderr, "%s, ", *s++);
1298 fprintf(stderr, "\n");
1299 free(prl_to);
1300 break;
1301 }
1302 case TEXT_TO_ANY_EXIT:
1303 prl_to = sec2annotation(tosec);
1304 fprintf(stderr,
1305 "The function %s() references a %s in an exit section.\n"
1306 "Often the %s %s%s has valid usage outside the exit section\n"
1307 "and the fix is to remove the %sannotation of %s.\n",
1308 fromsym, to, to, tosym, to_p, prl_to, tosym);
1309 free(prl_to);
1310 break;
1311 case DATA_TO_ANY_EXIT: {
1312 prl_to = sec2annotation(tosec);
1313 const char *const *s = mismatch->symbol_white_list;
1314 fprintf(stderr,
1315 "The variable %s references\n"
1316 "the %s %s%s%s\n"
1317 "If the reference is valid then annotate the\n"
1318 "variable with __exit* (see linux/init.h) or "
1319 "name the variable:\n",
1320 fromsym, to, prl_to, tosym, to_p);
1321 while (*s)
1322 fprintf(stderr, "%s, ", *s++);
1323 fprintf(stderr, "\n");
1324 free(prl_to);
1325 break;
1326 }
1327 case XXXINIT_TO_SOME_INIT:
1328 case XXXEXIT_TO_SOME_EXIT:
1329 prl_from = sec2annotation(fromsec);
1330 prl_to = sec2annotation(tosec);
1331 fprintf(stderr,
1332 "The %s %s%s%s references\n"
1333 "a %s %s%s%s.\n"
1334 "If %s is only used by %s then\n"
1335 "annotate %s with a matching annotation.\n",
1336 from, prl_from, fromsym, from_p,
1337 to, prl_to, tosym, to_p,
1338 tosym, fromsym, tosym);
1339 free(prl_from);
1340 free(prl_to);
1341 break;
1342 case ANY_INIT_TO_ANY_EXIT:
1343 prl_from = sec2annotation(fromsec);
1344 prl_to = sec2annotation(tosec);
1345 fprintf(stderr,
1346 "The %s %s%s%s references\n"
1347 "a %s %s%s%s.\n"
1348 "This is often seen when error handling "
1349 "in the init function\n"
1350 "uses functionality in the exit path.\n"
1351 "The fix is often to remove the %sannotation of\n"
1352 "%s%s so it may be used outside an exit section.\n",
1353 from, prl_from, fromsym, from_p,
1354 to, prl_to, tosym, to_p,
1355 sec2annotation(tosec), tosym, to_p);
1356 free(prl_from);
1357 free(prl_to);
1358 break;
1359 case ANY_EXIT_TO_ANY_INIT:
1360 prl_from = sec2annotation(fromsec);
1361 prl_to = sec2annotation(tosec);
1362 fprintf(stderr,
1363 "The %s %s%s%s references\n"
1364 "a %s %s%s%s.\n"
1365 "This is often seen when error handling "
1366 "in the exit function\n"
1367 "uses functionality in the init path.\n"
1368 "The fix is often to remove the %sannotation of\n"
1369 "%s%s so it may be used outside an init section.\n",
1370 from, prl_from, fromsym, from_p,
1371 to, prl_to, tosym, to_p,
1372 prl_to, tosym, to_p);
1373 free(prl_from);
1374 free(prl_to);
1375 break;
1376 case EXPORT_TO_INIT_EXIT:
1377 prl_to = sec2annotation(tosec);
1378 fprintf(stderr,
1379 "The symbol %s is exported and annotated %s\n"
1380 "Fix this by removing the %sannotation of %s "
1381 "or drop the export.\n",
1382 tosym, prl_to, prl_to, tosym);
1383 free(prl_to);
1384 break;
1385 }
1386 fprintf(stderr, "\n");
1387 }
1388
1389 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1390 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1391 {
1392 const char *tosec;
1393 const struct sectioncheck *mismatch;
1394
1395 tosec = sec_name(elf, get_secindex(elf, sym));
1396 mismatch = section_mismatch(fromsec, tosec);
1397 if (mismatch) {
1398 Elf_Sym *to;
1399 Elf_Sym *from;
1400 const char *tosym;
1401 const char *fromsym;
1402
1403 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1404 fromsym = sym_name(elf, from);
1405 to = find_elf_symbol(elf, r->r_addend, sym);
1406 tosym = sym_name(elf, to);
1407
1408 /* check whitelist - we may ignore it */
1409 if (secref_whitelist(mismatch,
1410 fromsec, fromsym, tosec, tosym)) {
1411 report_sec_mismatch(modname, mismatch,
1412 fromsec, r->r_offset, fromsym,
1413 is_function(from), tosec, tosym,
1414 is_function(to));
1415 }
1416 }
1417 }
1418
1419 static unsigned int *reloc_location(struct elf_info *elf,
1420 Elf_Shdr *sechdr, Elf_Rela *r)
1421 {
1422 Elf_Shdr *sechdrs = elf->sechdrs;
1423 int section = shndx2secindex(sechdr->sh_info);
1424
1425 return (void *)elf->hdr + sechdrs[section].sh_offset +
1426 r->r_offset - sechdrs[section].sh_addr;
1427 }
1428
1429 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1430 {
1431 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1432 unsigned int *location = reloc_location(elf, sechdr, r);
1433
1434 switch (r_typ) {
1435 case R_386_32:
1436 r->r_addend = TO_NATIVE(*location);
1437 break;
1438 case R_386_PC32:
1439 r->r_addend = TO_NATIVE(*location) + 4;
1440 /* For CONFIG_RELOCATABLE=y */
1441 if (elf->hdr->e_type == ET_EXEC)
1442 r->r_addend += r->r_offset;
1443 break;
1444 }
1445 return 0;
1446 }
1447
1448 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1449 {
1450 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1451
1452 switch (r_typ) {
1453 case R_ARM_ABS32:
1454 /* From ARM ABI: (S + A) | T */
1455 r->r_addend = (int)(long)
1456 (elf->symtab_start + ELF_R_SYM(r->r_info));
1457 break;
1458 case R_ARM_PC24:
1459 /* From ARM ABI: ((S + A) | T) - P */
1460 r->r_addend = (int)(long)(elf->hdr +
1461 sechdr->sh_offset +
1462 (r->r_offset - sechdr->sh_addr));
1463 break;
1464 default:
1465 return 1;
1466 }
1467 return 0;
1468 }
1469
1470 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1471 {
1472 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1473 unsigned int *location = reloc_location(elf, sechdr, r);
1474 unsigned int inst;
1475
1476 if (r_typ == R_MIPS_HI16)
1477 return 1; /* skip this */
1478 inst = TO_NATIVE(*location);
1479 switch (r_typ) {
1480 case R_MIPS_LO16:
1481 r->r_addend = inst & 0xffff;
1482 break;
1483 case R_MIPS_26:
1484 r->r_addend = (inst & 0x03ffffff) << 2;
1485 break;
1486 case R_MIPS_32:
1487 r->r_addend = inst;
1488 break;
1489 }
1490 return 0;
1491 }
1492
1493 static void section_rela(const char *modname, struct elf_info *elf,
1494 Elf_Shdr *sechdr)
1495 {
1496 Elf_Sym *sym;
1497 Elf_Rela *rela;
1498 Elf_Rela r;
1499 unsigned int r_sym;
1500 const char *fromsec;
1501
1502 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1503 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1504
1505 fromsec = sech_name(elf, sechdr);
1506 fromsec += strlen(".rela");
1507 /* if from section (name) is know good then skip it */
1508 if (match(fromsec, section_white_list))
1509 return;
1510
1511 for (rela = start; rela < stop; rela++) {
1512 r.r_offset = TO_NATIVE(rela->r_offset);
1513 #if KERNEL_ELFCLASS == ELFCLASS64
1514 if (elf->hdr->e_machine == EM_MIPS) {
1515 unsigned int r_typ;
1516 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1517 r_sym = TO_NATIVE(r_sym);
1518 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1519 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1520 } else {
1521 r.r_info = TO_NATIVE(rela->r_info);
1522 r_sym = ELF_R_SYM(r.r_info);
1523 }
1524 #else
1525 r.r_info = TO_NATIVE(rela->r_info);
1526 r_sym = ELF_R_SYM(r.r_info);
1527 #endif
1528 r.r_addend = TO_NATIVE(rela->r_addend);
1529 sym = elf->symtab_start + r_sym;
1530 /* Skip special sections */
1531 if (is_shndx_special(sym->st_shndx))
1532 continue;
1533 check_section_mismatch(modname, elf, &r, sym, fromsec);
1534 }
1535 }
1536
1537 static void section_rel(const char *modname, struct elf_info *elf,
1538 Elf_Shdr *sechdr)
1539 {
1540 Elf_Sym *sym;
1541 Elf_Rel *rel;
1542 Elf_Rela r;
1543 unsigned int r_sym;
1544 const char *fromsec;
1545
1546 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1547 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1548
1549 fromsec = sech_name(elf, sechdr);
1550 fromsec += strlen(".rel");
1551 /* if from section (name) is know good then skip it */
1552 if (match(fromsec, section_white_list))
1553 return;
1554
1555 for (rel = start; rel < stop; rel++) {
1556 r.r_offset = TO_NATIVE(rel->r_offset);
1557 #if KERNEL_ELFCLASS == ELFCLASS64
1558 if (elf->hdr->e_machine == EM_MIPS) {
1559 unsigned int r_typ;
1560 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1561 r_sym = TO_NATIVE(r_sym);
1562 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1563 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1564 } else {
1565 r.r_info = TO_NATIVE(rel->r_info);
1566 r_sym = ELF_R_SYM(r.r_info);
1567 }
1568 #else
1569 r.r_info = TO_NATIVE(rel->r_info);
1570 r_sym = ELF_R_SYM(r.r_info);
1571 #endif
1572 r.r_addend = 0;
1573 switch (elf->hdr->e_machine) {
1574 case EM_386:
1575 if (addend_386_rel(elf, sechdr, &r))
1576 continue;
1577 break;
1578 case EM_ARM:
1579 if (addend_arm_rel(elf, sechdr, &r))
1580 continue;
1581 break;
1582 case EM_MIPS:
1583 if (addend_mips_rel(elf, sechdr, &r))
1584 continue;
1585 break;
1586 }
1587 sym = elf->symtab_start + r_sym;
1588 /* Skip special sections */
1589 if (is_shndx_special(sym->st_shndx))
1590 continue;
1591 check_section_mismatch(modname, elf, &r, sym, fromsec);
1592 }
1593 }
1594
1595 /**
1596 * A module includes a number of sections that are discarded
1597 * either when loaded or when used as built-in.
1598 * For loaded modules all functions marked __init and all data
1599 * marked __initdata will be discarded when the module has been intialized.
1600 * Likewise for modules used built-in the sections marked __exit
1601 * are discarded because __exit marked function are supposed to be called
1602 * only when a module is unloaded which never happens for built-in modules.
1603 * The check_sec_ref() function traverses all relocation records
1604 * to find all references to a section that reference a section that will
1605 * be discarded and warns about it.
1606 **/
1607 static void check_sec_ref(struct module *mod, const char *modname,
1608 struct elf_info *elf)
1609 {
1610 int i;
1611 Elf_Shdr *sechdrs = elf->sechdrs;
1612
1613 /* Walk through all sections */
1614 for (i = 0; i < elf->num_sections; i++) {
1615 check_section(modname, elf, &elf->sechdrs[i]);
1616 /* We want to process only relocation sections and not .init */
1617 if (sechdrs[i].sh_type == SHT_RELA)
1618 section_rela(modname, elf, &elf->sechdrs[i]);
1619 else if (sechdrs[i].sh_type == SHT_REL)
1620 section_rel(modname, elf, &elf->sechdrs[i]);
1621 }
1622 }
1623
1624 static void read_symbols(char *modname)
1625 {
1626 const char *symname;
1627 char *version;
1628 char *license;
1629 struct module *mod;
1630 struct elf_info info = { };
1631 Elf_Sym *sym;
1632
1633 if (!parse_elf(&info, modname))
1634 return;
1635
1636 mod = new_module(modname);
1637
1638 /* When there's no vmlinux, don't print warnings about
1639 * unresolved symbols (since there'll be too many ;) */
1640 if (is_vmlinux(modname)) {
1641 have_vmlinux = 1;
1642 mod->skip = 1;
1643 }
1644
1645 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1646 if (info.modinfo && !license && !is_vmlinux(modname))
1647 warn("modpost: missing MODULE_LICENSE() in %s\n"
1648 "see include/linux/module.h for "
1649 "more information\n", modname);
1650 while (license) {
1651 if (license_is_gpl_compatible(license))
1652 mod->gpl_compatible = 1;
1653 else {
1654 mod->gpl_compatible = 0;
1655 break;
1656 }
1657 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1658 "license", license);
1659 }
1660
1661 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1662 symname = info.strtab + sym->st_name;
1663
1664 handle_modversions(mod, &info, sym, symname);
1665 handle_moddevtable(mod, &info, sym, symname);
1666 }
1667 if (!is_vmlinux(modname) ||
1668 (is_vmlinux(modname) && vmlinux_section_warnings))
1669 check_sec_ref(mod, modname, &info);
1670
1671 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1672 if (version)
1673 maybe_frob_rcs_version(modname, version, info.modinfo,
1674 version - (char *)info.hdr);
1675 if (version || (all_versions && !is_vmlinux(modname)))
1676 get_src_version(modname, mod->srcversion,
1677 sizeof(mod->srcversion)-1);
1678
1679 parse_elf_finish(&info);
1680
1681 /* Our trick to get versioning for module struct etc. - it's
1682 * never passed as an argument to an exported function, so
1683 * the automatic versioning doesn't pick it up, but it's really
1684 * important anyhow */
1685 if (modversions)
1686 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1687 }
1688
1689 #define SZ 500
1690
1691 /* We first write the generated file into memory using the
1692 * following helper, then compare to the file on disk and
1693 * only update the later if anything changed */
1694
1695 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1696 const char *fmt, ...)
1697 {
1698 char tmp[SZ];
1699 int len;
1700 va_list ap;
1701
1702 va_start(ap, fmt);
1703 len = vsnprintf(tmp, SZ, fmt, ap);
1704 buf_write(buf, tmp, len);
1705 va_end(ap);
1706 }
1707
1708 void buf_write(struct buffer *buf, const char *s, int len)
1709 {
1710 if (buf->size - buf->pos < len) {
1711 buf->size += len + SZ;
1712 buf->p = realloc(buf->p, buf->size);
1713 }
1714 strncpy(buf->p + buf->pos, s, len);
1715 buf->pos += len;
1716 }
1717
1718 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1719 {
1720 const char *e = is_vmlinux(m) ?"":".ko";
1721
1722 switch (exp) {
1723 case export_gpl:
1724 fatal("modpost: GPL-incompatible module %s%s "
1725 "uses GPL-only symbol '%s'\n", m, e, s);
1726 break;
1727 case export_unused_gpl:
1728 fatal("modpost: GPL-incompatible module %s%s "
1729 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1730 break;
1731 case export_gpl_future:
1732 warn("modpost: GPL-incompatible module %s%s "
1733 "uses future GPL-only symbol '%s'\n", m, e, s);
1734 break;
1735 case export_plain:
1736 case export_unused:
1737 case export_unknown:
1738 /* ignore */
1739 break;
1740 }
1741 }
1742
1743 static void check_for_unused(enum export exp, const char *m, const char *s)
1744 {
1745 const char *e = is_vmlinux(m) ?"":".ko";
1746
1747 switch (exp) {
1748 case export_unused:
1749 case export_unused_gpl:
1750 warn("modpost: module %s%s "
1751 "uses symbol '%s' marked UNUSED\n", m, e, s);
1752 break;
1753 default:
1754 /* ignore */
1755 break;
1756 }
1757 }
1758
1759 static void check_exports(struct module *mod)
1760 {
1761 struct symbol *s, *exp;
1762
1763 for (s = mod->unres; s; s = s->next) {
1764 const char *basename;
1765 exp = find_symbol(s->name);
1766 if (!exp || exp->module == mod)
1767 continue;
1768 basename = strrchr(mod->name, '/');
1769 if (basename)
1770 basename++;
1771 else
1772 basename = mod->name;
1773 if (!mod->gpl_compatible)
1774 check_for_gpl_usage(exp->export, basename, exp->name);
1775 check_for_unused(exp->export, basename, exp->name);
1776 }
1777 }
1778
1779 /**
1780 * Header for the generated file
1781 **/
1782 static void add_header(struct buffer *b, struct module *mod)
1783 {
1784 buf_printf(b, "#include <linux/module.h>\n");
1785 buf_printf(b, "#include <linux/vermagic.h>\n");
1786 buf_printf(b, "#include <linux/compiler.h>\n");
1787 buf_printf(b, "\n");
1788 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1789 buf_printf(b, "\n");
1790 buf_printf(b, "struct module __this_module\n");
1791 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1792 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1793 if (mod->has_init)
1794 buf_printf(b, " .init = init_module,\n");
1795 if (mod->has_cleanup)
1796 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1797 " .exit = cleanup_module,\n"
1798 "#endif\n");
1799 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1800 buf_printf(b, "};\n");
1801 }
1802
1803 static void add_staging_flag(struct buffer *b, const char *name)
1804 {
1805 static const char *staging_dir = "drivers/staging";
1806
1807 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1808 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1809 }
1810
1811 /**
1812 * Record CRCs for unresolved symbols
1813 **/
1814 static int add_versions(struct buffer *b, struct module *mod)
1815 {
1816 struct symbol *s, *exp;
1817 int err = 0;
1818
1819 for (s = mod->unres; s; s = s->next) {
1820 exp = find_symbol(s->name);
1821 if (!exp || exp->module == mod) {
1822 if (have_vmlinux && !s->weak) {
1823 if (warn_unresolved) {
1824 warn("\"%s\" [%s.ko] undefined!\n",
1825 s->name, mod->name);
1826 } else {
1827 merror("\"%s\" [%s.ko] undefined!\n",
1828 s->name, mod->name);
1829 err = 1;
1830 }
1831 }
1832 continue;
1833 }
1834 s->module = exp->module;
1835 s->crc_valid = exp->crc_valid;
1836 s->crc = exp->crc;
1837 }
1838
1839 if (!modversions)
1840 return err;
1841
1842 buf_printf(b, "\n");
1843 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1844 buf_printf(b, "__used\n");
1845 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1846
1847 for (s = mod->unres; s; s = s->next) {
1848 if (!s->module)
1849 continue;
1850 if (!s->crc_valid) {
1851 warn("\"%s\" [%s.ko] has no CRC!\n",
1852 s->name, mod->name);
1853 continue;
1854 }
1855 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1856 }
1857
1858 buf_printf(b, "};\n");
1859
1860 return err;
1861 }
1862
1863 static void add_depends(struct buffer *b, struct module *mod,
1864 struct module *modules)
1865 {
1866 struct symbol *s;
1867 struct module *m;
1868 int first = 1;
1869
1870 for (m = modules; m; m = m->next)
1871 m->seen = is_vmlinux(m->name);
1872
1873 buf_printf(b, "\n");
1874 buf_printf(b, "static const char __module_depends[]\n");
1875 buf_printf(b, "__used\n");
1876 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1877 buf_printf(b, "\"depends=");
1878 for (s = mod->unres; s; s = s->next) {
1879 const char *p;
1880 if (!s->module)
1881 continue;
1882
1883 if (s->module->seen)
1884 continue;
1885
1886 s->module->seen = 1;
1887 p = strrchr(s->module->name, '/');
1888 if (p)
1889 p++;
1890 else
1891 p = s->module->name;
1892 buf_printf(b, "%s%s", first ? "" : ",", p);
1893 first = 0;
1894 }
1895 buf_printf(b, "\";\n");
1896 }
1897
1898 static void add_srcversion(struct buffer *b, struct module *mod)
1899 {
1900 if (mod->srcversion[0]) {
1901 buf_printf(b, "\n");
1902 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1903 mod->srcversion);
1904 }
1905 }
1906
1907 static void write_if_changed(struct buffer *b, const char *fname)
1908 {
1909 char *tmp;
1910 FILE *file;
1911 struct stat st;
1912
1913 file = fopen(fname, "r");
1914 if (!file)
1915 goto write;
1916
1917 if (fstat(fileno(file), &st) < 0)
1918 goto close_write;
1919
1920 if (st.st_size != b->pos)
1921 goto close_write;
1922
1923 tmp = NOFAIL(malloc(b->pos));
1924 if (fread(tmp, 1, b->pos, file) != b->pos)
1925 goto free_write;
1926
1927 if (memcmp(tmp, b->p, b->pos) != 0)
1928 goto free_write;
1929
1930 free(tmp);
1931 fclose(file);
1932 return;
1933
1934 free_write:
1935 free(tmp);
1936 close_write:
1937 fclose(file);
1938 write:
1939 file = fopen(fname, "w");
1940 if (!file) {
1941 perror(fname);
1942 exit(1);
1943 }
1944 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1945 perror(fname);
1946 exit(1);
1947 }
1948 fclose(file);
1949 }
1950
1951 /* parse Module.symvers file. line format:
1952 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1953 **/
1954 static void read_dump(const char *fname, unsigned int kernel)
1955 {
1956 unsigned long size, pos = 0;
1957 void *file = grab_file(fname, &size);
1958 char *line;
1959
1960 if (!file)
1961 /* No symbol versions, silently ignore */
1962 return;
1963
1964 while ((line = get_next_line(&pos, file, size))) {
1965 char *symname, *modname, *d, *export, *end;
1966 unsigned int crc;
1967 struct module *mod;
1968 struct symbol *s;
1969
1970 if (!(symname = strchr(line, '\t')))
1971 goto fail;
1972 *symname++ = '\0';
1973 if (!(modname = strchr(symname, '\t')))
1974 goto fail;
1975 *modname++ = '\0';
1976 if ((export = strchr(modname, '\t')) != NULL)
1977 *export++ = '\0';
1978 if (export && ((end = strchr(export, '\t')) != NULL))
1979 *end = '\0';
1980 crc = strtoul(line, &d, 16);
1981 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1982 goto fail;
1983 mod = find_module(modname);
1984 if (!mod) {
1985 if (is_vmlinux(modname))
1986 have_vmlinux = 1;
1987 mod = new_module(modname);
1988 mod->skip = 1;
1989 }
1990 s = sym_add_exported(symname, mod, export_no(export));
1991 s->kernel = kernel;
1992 s->preloaded = 1;
1993 sym_update_crc(symname, mod, crc, export_no(export));
1994 }
1995 return;
1996 fail:
1997 fatal("parse error in symbol dump file\n");
1998 }
1999
2000 /* For normal builds always dump all symbols.
2001 * For external modules only dump symbols
2002 * that are not read from kernel Module.symvers.
2003 **/
2004 static int dump_sym(struct symbol *sym)
2005 {
2006 if (!external_module)
2007 return 1;
2008 if (sym->vmlinux || sym->kernel)
2009 return 0;
2010 return 1;
2011 }
2012
2013 static void write_dump(const char *fname)
2014 {
2015 struct buffer buf = { };
2016 struct symbol *symbol;
2017 int n;
2018
2019 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2020 symbol = symbolhash[n];
2021 while (symbol) {
2022 if (dump_sym(symbol))
2023 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2024 symbol->crc, symbol->name,
2025 symbol->module->name,
2026 export_str(symbol->export));
2027 symbol = symbol->next;
2028 }
2029 }
2030 write_if_changed(&buf, fname);
2031 }
2032
2033 struct ext_sym_list {
2034 struct ext_sym_list *next;
2035 const char *file;
2036 };
2037
2038 int main(int argc, char **argv)
2039 {
2040 struct module *mod;
2041 struct buffer buf = { };
2042 char *kernel_read = NULL, *module_read = NULL;
2043 char *dump_write = NULL;
2044 int opt;
2045 int err;
2046 struct ext_sym_list *extsym_iter;
2047 struct ext_sym_list *extsym_start = NULL;
2048
2049 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2050 switch (opt) {
2051 case 'i':
2052 kernel_read = optarg;
2053 break;
2054 case 'I':
2055 module_read = optarg;
2056 external_module = 1;
2057 break;
2058 case 'c':
2059 cross_build = 1;
2060 break;
2061 case 'e':
2062 external_module = 1;
2063 extsym_iter =
2064 NOFAIL(malloc(sizeof(*extsym_iter)));
2065 extsym_iter->next = extsym_start;
2066 extsym_iter->file = optarg;
2067 extsym_start = extsym_iter;
2068 break;
2069 case 'm':
2070 modversions = 1;
2071 break;
2072 case 'o':
2073 dump_write = optarg;
2074 break;
2075 case 'a':
2076 all_versions = 1;
2077 break;
2078 case 's':
2079 vmlinux_section_warnings = 0;
2080 break;
2081 case 'S':
2082 sec_mismatch_verbose = 0;
2083 break;
2084 case 'w':
2085 warn_unresolved = 1;
2086 break;
2087 default:
2088 exit(1);
2089 }
2090 }
2091
2092 if (kernel_read)
2093 read_dump(kernel_read, 1);
2094 if (module_read)
2095 read_dump(module_read, 0);
2096 while (extsym_start) {
2097 read_dump(extsym_start->file, 0);
2098 extsym_iter = extsym_start->next;
2099 free(extsym_start);
2100 extsym_start = extsym_iter;
2101 }
2102
2103 while (optind < argc)
2104 read_symbols(argv[optind++]);
2105
2106 for (mod = modules; mod; mod = mod->next) {
2107 if (mod->skip)
2108 continue;
2109 check_exports(mod);
2110 }
2111
2112 err = 0;
2113
2114 for (mod = modules; mod; mod = mod->next) {
2115 char fname[strlen(mod->name) + 10];
2116
2117 if (mod->skip)
2118 continue;
2119
2120 buf.pos = 0;
2121
2122 add_header(&buf, mod);
2123 add_staging_flag(&buf, mod->name);
2124 err |= add_versions(&buf, mod);
2125 add_depends(&buf, mod, modules);
2126 add_moddevtable(&buf, mod);
2127 add_srcversion(&buf, mod);
2128
2129 sprintf(fname, "%s.mod.c", mod->name);
2130 write_if_changed(&buf, fname);
2131 }
2132
2133 if (dump_write)
2134 write_dump(dump_write);
2135 if (sec_mismatch_count && !sec_mismatch_verbose)
2136 warn("modpost: Found %d section mismatch(es).\n"
2137 "To see full details build your kernel with:\n"
2138 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2139 sec_mismatch_count);
2140
2141 return err;
2142 }
Linus' kernel tree