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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / scripts / mod / modpost.c
blobd0e3de9a84051cd9628e667546f2fcf647f3ee32
1 /* Modified by Broadcom Corp. Portions Copyright (c) Broadcom Corp, 2012. */
2 /* Postprocess module symbol versions
3 *
4 * Copyright 2003 Kai Germaschewski
5 * Copyright 2002-2004 Rusty Russell, IBM Corporation
6 * Copyright 2006-2008 Sam Ravnborg
7 * Based in part on module-init-tools/depmod.c,file2alias
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
11 *
12 * Usage: modpost vmlinux module1.o module2.o ...
13 */
14
15 #define _GNU_SOURCE
16 #include <stdio.h>
17 #include <ctype.h>
18 #include <string.h>
19 #include "modpost.h"
20 #include "../../include/generated/autoconf.h"
21 #include "../../include/linux/license.h"
22
23 /* Some toolchains use a `_' prefix for all user symbols. */
24 #ifdef CONFIG_SYMBOL_PREFIX
25 #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
26 #else
27 #define MODULE_SYMBOL_PREFIX ""
28 #endif
29
30
31 /* Are we using CONFIG_MODVERSIONS? */
32 int modversions = 0;
33 /* Warn about undefined symbols? (do so if we have vmlinux) */
34 int have_vmlinux = 0;
35 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
36 static int all_versions = 0;
37 /* If we are modposting external module set to 1 */
38 static int external_module = 0;
39 /* Warn about section mismatch in vmlinux if set to 1 */
40 static int vmlinux_section_warnings = 1;
41 /* Only warn about unresolved symbols */
42 static int warn_unresolved = 0;
43 /* How a symbol is exported */
44 static int sec_mismatch_count = 0;
45 static int sec_mismatch_verbose = 1;
46
47 enum export {
48 export_plain, export_unused, export_gpl,
49 export_unused_gpl, export_gpl_future, export_unknown
50 };
51
52 #define PRINTF __attribute__ ((format (printf, 1, 2)))
53
54 PRINTF void fatal(const char *fmt, ...)
55 {
56 va_list arglist;
57
58 fprintf(stderr, "FATAL: ");
59
60 va_start(arglist, fmt);
61 vfprintf(stderr, fmt, arglist);
62 va_end(arglist);
63
64 exit(1);
65 }
66
67 PRINTF void warn(const char *fmt, ...)
68 {
69 va_list arglist;
70
71 fprintf(stderr, "WARNING: ");
72
73 va_start(arglist, fmt);
74 vfprintf(stderr, fmt, arglist);
75 va_end(arglist);
76 }
77
78 PRINTF void merror(const char *fmt, ...)
79 {
80 va_list arglist;
81
82 fprintf(stderr, "ERROR: ");
83
84 va_start(arglist, fmt);
85 vfprintf(stderr, fmt, arglist);
86 va_end(arglist);
87 }
88
89 static int is_vmlinux(const char *modname)
90 {
91 const char *myname;
92
93 myname = strrchr(modname, '/');
94 if (myname)
95 myname++;
96 else
97 myname = modname;
98
99 return (strcmp(myname, "vmlinux") == 0) ||
100 (strcmp(myname, "vmlinux.o") == 0);
101 }
102
103 void *do_nofail(void *ptr, const char *expr)
104 {
105 if (!ptr)
106 fatal("modpost: Memory allocation failure: %s.\n", expr);
107
108 return ptr;
109 }
110
111 /* A list of all modules we processed */
112 static struct module *modules;
113
114 static struct module *find_module(char *modname)
115 {
116 struct module *mod;
117
118 for (mod = modules; mod; mod = mod->next)
119 if (strcmp(mod->name, modname) == 0)
120 break;
121 return mod;
122 }
123
124 static struct module *new_module(char *modname)
125 {
126 struct module *mod;
127 char *p, *s;
128
129 mod = NOFAIL(malloc(sizeof(*mod)));
130 memset(mod, 0, sizeof(*mod));
131 p = NOFAIL(strdup(modname));
132
133 /* strip trailing .o */
134 s = strrchr(p, '.');
135 if (s != NULL)
136 if (strcmp(s, ".o") == 0)
137 *s = '\0';
138
139 /* add to list */
140 mod->name = p;
141 mod->gpl_compatible = -1;
142 mod->next = modules;
143 modules = mod;
144
145 return mod;
146 }
147
148 /* A hash of all exported symbols,
149 * struct symbol is also used for lists of unresolved symbols */
150
151 #define SYMBOL_HASH_SIZE 1024
152
153 struct symbol {
154 struct symbol *next;
155 struct module *module;
156 unsigned int crc;
157 int crc_valid;
158 unsigned int weak:1;
159 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
160 unsigned int kernel:1; /* 1 if symbol is from kernel
161 * (only for external modules) **/
162 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
163 enum export export; /* Type of export */
164 char name[0];
165 };
166
167 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
168
169 /* This is based on the hash agorithm from gdbm, via tdb */
170 static inline unsigned int tdb_hash(const char *name)
171 {
172 unsigned value; /* Used to compute the hash value. */
173 unsigned i; /* Used to cycle through random values. */
174
175 /* Set the initial value from the key size. */
176 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
177 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
178
179 return (1103515243 * value + 12345);
180 }
181
182 /**
183 * Allocate a new symbols for use in the hash of exported symbols or
184 * the list of unresolved symbols per module
185 **/
186 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
187 struct symbol *next)
188 {
189 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
190
191 memset(s, 0, sizeof(*s));
192 strcpy(s->name, name);
193 s->weak = weak;
194 s->next = next;
195 return s;
196 }
197
198 /* For the hash of exported symbols */
199 static struct symbol *new_symbol(const char *name, struct module *module,
200 enum export export)
201 {
202 unsigned int hash;
203 struct symbol *new;
204
205 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
206 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
207 new->module = module;
208 new->export = export;
209 return new;
210 }
211
212 static struct symbol *find_symbol(const char *name)
213 {
214 struct symbol *s;
215
216 /* For our purposes, .foo matches foo. PPC64 needs this. */
217 if (name[0] == '.')
218 name++;
219
220 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
221 if (strcmp(s->name, name) == 0)
222 return s;
223 }
224 return NULL;
225 }
226
227 static struct {
228 const char *str;
229 enum export export;
230 } export_list[] = {
231 { .str = "EXPORT_SYMBOL", .export = export_plain },
232 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
233 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
234 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
235 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
236 { .str = "(unknown)", .export = export_unknown },
237 };
238
239
240 static const char *export_str(enum export ex)
241 {
242 return export_list[ex].str;
243 }
244
245 static enum export export_no(const char *s)
246 {
247 int i;
248
249 if (!s)
250 return export_unknown;
251 for (i = 0; export_list[i].export != export_unknown; i++) {
252 if (strcmp(export_list[i].str, s) == 0)
253 return export_list[i].export;
254 }
255 return export_unknown;
256 }
257
258 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
259 {
260 if (sec == elf->export_sec)
261 return export_plain;
262 else if (sec == elf->export_unused_sec)
263 return export_unused;
264 else if (sec == elf->export_gpl_sec)
265 return export_gpl;
266 else if (sec == elf->export_unused_gpl_sec)
267 return export_unused_gpl;
268 else if (sec == elf->export_gpl_future_sec)
269 return export_gpl_future;
270 else
271 return export_unknown;
272 }
273
274 /**
275 * Add an exported symbol - it may have already been added without a
276 * CRC, in this case just update the CRC
277 **/
278 static struct symbol *sym_add_exported(const char *name, struct module *mod,
279 enum export export)
280 {
281 struct symbol *s = find_symbol(name);
282
283 if (!s) {
284 s = new_symbol(name, mod, export);
285 } else {
286 if (!s->preloaded) {
287 warn("%s: '%s' exported twice. Previous export "
288 "was in %s%s\n", mod->name, name,
289 s->module->name,
290 is_vmlinux(s->module->name) ?"":".ko");
291 } else {
292 /* In case Modules.symvers was out of date */
293 s->module = mod;
294 }
295 }
296 s->preloaded = 0;
297 s->vmlinux = is_vmlinux(mod->name);
298 s->kernel = 0;
299 s->export = export;
300 return s;
301 }
302
303 static void sym_update_crc(const char *name, struct module *mod,
304 unsigned int crc, enum export export)
305 {
306 struct symbol *s = find_symbol(name);
307
308 if (!s)
309 s = new_symbol(name, mod, export);
310 s->crc = crc;
311 s->crc_valid = 1;
312 }
313
314 void *grab_file(const char *filename, unsigned long *size)
315 {
316 struct stat st;
317 void *map;
318 int fd;
319
320 fd = open(filename, O_RDONLY);
321 if (fd < 0 || fstat(fd, &st) != 0)
322 return NULL;
323
324 *size = st.st_size;
325 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
326 close(fd);
327
328 if (map == MAP_FAILED)
329 return NULL;
330 return map;
331 }
332
333 /**
334 * Return a copy of the next line in a mmap'ed file.
335 * spaces in the beginning of the line is trimmed away.
336 * Return a pointer to a static buffer.
337 **/
338 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
339 {
340 static char line[4096];
341 int skip = 1;
342 size_t len = 0;
343 signed char *p = (signed char *)file + *pos;
344 char *s = line;
345
346 for (; *pos < size ; (*pos)++) {
347 if (skip && isspace(*p)) {
348 p++;
349 continue;
350 }
351 skip = 0;
352 if (*p != '\n' && (*pos < size)) {
353 len++;
354 *s++ = *p++;
355 if (len > 4095)
356 break; /* Too long, stop */
357 } else {
358 /* End of string */
359 *s = '\0';
360 return line;
361 }
362 }
363 /* End of buffer */
364 return NULL;
365 }
366
367 void release_file(void *file, unsigned long size)
368 {
369 munmap(file, size);
370 }
371
372 static int parse_elf(struct elf_info *info, const char *filename)
373 {
374 unsigned int i;
375 Elf_Ehdr *hdr;
376 Elf_Shdr *sechdrs;
377 Elf_Sym *sym;
378 const char *secstrings;
379 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
380
381 hdr = grab_file(filename, &info->size);
382 if (!hdr) {
383 perror(filename);
384 exit(1);
385 }
386 info->hdr = hdr;
387 if (info->size < sizeof(*hdr)) {
388 /* file too small, assume this is an empty .o file */
389 return 0;
390 }
391 /* Is this a valid ELF file? */
392 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
393 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
394 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
395 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
396 /* Not an ELF file - silently ignore it */
397 return 0;
398 }
399 /* Fix endianness in ELF header */
400 hdr->e_type = TO_NATIVE(hdr->e_type);
401 hdr->e_machine = TO_NATIVE(hdr->e_machine);
402 hdr->e_version = TO_NATIVE(hdr->e_version);
403 hdr->e_entry = TO_NATIVE(hdr->e_entry);
404 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
405 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
406 hdr->e_flags = TO_NATIVE(hdr->e_flags);
407 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
408 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
409 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
410 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
411 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
412 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
413 sechdrs = (void *)hdr + hdr->e_shoff;
414 info->sechdrs = sechdrs;
415
416 /* Check if file offset is correct */
417 if (hdr->e_shoff > info->size) {
418 fatal("section header offset=%lu in file '%s' is bigger than "
419 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
420 filename, info->size);
421 return 0;
422 }
423
424 if (hdr->e_shnum == 0) {
425 /*
426 * There are more than 64k sections,
427 * read count from .sh_size.
428 * note: it doesn't need shndx2secindex()
429 */
430 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
431 }
432 else {
433 info->num_sections = hdr->e_shnum;
434 }
435 if (hdr->e_shstrndx == SHN_XINDEX) {
436 info->secindex_strings =
437 shndx2secindex(TO_NATIVE(sechdrs[0].sh_link));
438 }
439 else {
440 info->secindex_strings = hdr->e_shstrndx;
441 }
442
443 /* Fix endianness in section headers */
444 for (i = 0; i < info->num_sections; i++) {
445 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
446 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
447 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
448 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
449 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
450 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
451 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
452 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
453 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
454 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
455 }
456 /* Find symbol table. */
457 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
458 for (i = 1; i < info->num_sections; i++) {
459 const char *secname;
460 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
461
462 if (!nobits && sechdrs[i].sh_offset > info->size) {
463 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
464 "sizeof(*hrd)=%zu\n", filename,
465 (unsigned long)sechdrs[i].sh_offset,
466 sizeof(*hdr));
467 return 0;
468 }
469 secname = secstrings + sechdrs[i].sh_name;
470 if (strcmp(secname, ".modinfo") == 0) {
471 if (nobits)
472 fatal("%s has NOBITS .modinfo\n", filename);
473 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
474 info->modinfo_len = sechdrs[i].sh_size;
475 } else if (strcmp(secname, "__ksymtab") == 0)
476 info->export_sec = i;
477 else if (strcmp(secname, "__ksymtab_unused") == 0)
478 info->export_unused_sec = i;
479 else if (strcmp(secname, "__ksymtab_gpl") == 0)
480 info->export_gpl_sec = i;
481 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
482 info->export_unused_gpl_sec = i;
483 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
484 info->export_gpl_future_sec = i;
485
486 if (sechdrs[i].sh_type == SHT_SYMTAB) {
487 unsigned int sh_link_idx;
488 symtab_idx = i;
489 info->symtab_start = (void *)hdr +
490 sechdrs[i].sh_offset;
491 info->symtab_stop = (void *)hdr +
492 sechdrs[i].sh_offset + sechdrs[i].sh_size;
493 sh_link_idx = shndx2secindex(sechdrs[i].sh_link);
494 info->strtab = (void *)hdr +
495 sechdrs[sh_link_idx].sh_offset;
496 }
497
498 /* 32bit section no. table? ("more than 64k sections") */
499 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
500 symtab_shndx_idx = i;
501 info->symtab_shndx_start = (void *)hdr +
502 sechdrs[i].sh_offset;
503 info->symtab_shndx_stop = (void *)hdr +
504 sechdrs[i].sh_offset + sechdrs[i].sh_size;
505 }
506 }
507 if (!info->symtab_start)
508 fatal("%s has no symtab?\n", filename);
509
510 /* Fix endianness in symbols */
511 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
512 sym->st_shndx = TO_NATIVE(sym->st_shndx);
513 sym->st_name = TO_NATIVE(sym->st_name);
514 sym->st_value = TO_NATIVE(sym->st_value);
515 sym->st_size = TO_NATIVE(sym->st_size);
516 }
517
518 if (symtab_shndx_idx != ~0U) {
519 Elf32_Word *p;
520 if (symtab_idx !=
521 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link))
522 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
523 filename,
524 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link),
525 symtab_idx);
526 /* Fix endianness */
527 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
528 p++)
529 *p = TO_NATIVE(*p);
530 }
531
532 return 1;
533 }
534
535 static void parse_elf_finish(struct elf_info *info)
536 {
537 release_file(info->hdr, info->size);
538 }
539
540 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
541 {
542 /* ignore __this_module, it will be resolved shortly */
543 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
544 return 1;
545 /* ignore global offset table */
546 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
547 return 1;
548 if (info->hdr->e_machine == EM_PPC)
549 /* Special register function linked on all modules during final link of .ko */
550 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
551 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
552 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
553 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
554 return 1;
555 if (info->hdr->e_machine == EM_PPC64)
556 /* Special register function linked on all modules during final link of .ko */
557 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
558 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
559 return 1;
560 /* Do not ignore this symbol */
561 return 0;
562 }
563
564 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
565 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
566
567 static void handle_modversions(struct module *mod, struct elf_info *info,
568 Elf_Sym *sym, const char *symname)
569 {
570 unsigned int crc;
571 enum export export = export_from_sec(info, get_secindex(info, sym));
572
573 switch (sym->st_shndx) {
574 case SHN_COMMON:
575 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
576 break;
577 case SHN_ABS:
578 /* CRC'd symbol */
579 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
580 crc = (unsigned int) sym->st_value;
581 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
582 export);
583 }
584 break;
585 case SHN_UNDEF:
586 /* undefined symbol */
587 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
588 ELF_ST_BIND(sym->st_info) != STB_WEAK)
589 break;
590 if (ignore_undef_symbol(info, symname))
591 break;
592 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
593 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
594 /* add compatibility with older glibc */
595 #ifndef STT_SPARC_REGISTER
596 #define STT_SPARC_REGISTER STT_REGISTER
597 #endif
598 if (info->hdr->e_machine == EM_SPARC ||
599 info->hdr->e_machine == EM_SPARCV9) {
600 /* Ignore register directives. */
601 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
602 break;
603 if (symname[0] == '.') {
604 char *munged = strdup(symname);
605 munged[0] = '_';
606 munged[1] = toupper(munged[1]);
607 symname = munged;
608 }
609 }
610 #endif
611
612 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
613 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
614 mod->unres =
615 alloc_symbol(symname +
616 strlen(MODULE_SYMBOL_PREFIX),
617 ELF_ST_BIND(sym->st_info) == STB_WEAK,
618 mod->unres);
619 }
620 break;
621 default:
622 /* All exported symbols */
623 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
624 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
625 export);
626 }
627 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
628 mod->has_init = 1;
629 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
630 mod->has_cleanup = 1;
631 break;
632 }
633 }
634
635 /**
636 * Parse tag=value strings from .modinfo section
637 **/
638 static char *next_string(char *string, unsigned long *secsize)
639 {
640 /* Skip non-zero chars */
641 while (string[0]) {
642 string++;
643 if ((*secsize)-- <= 1)
644 return NULL;
645 }
646
647 /* Skip any zero padding. */
648 while (!string[0]) {
649 string++;
650 if ((*secsize)-- <= 1)
651 return NULL;
652 }
653 return string;
654 }
655
656 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
657 const char *tag, char *info)
658 {
659 char *p;
660 unsigned int taglen = strlen(tag);
661 unsigned long size = modinfo_len;
662
663 if (info) {
664 size -= info - (char *)modinfo;
665 modinfo = next_string(info, &size);
666 }
667
668 for (p = modinfo; p; p = next_string(p, &size)) {
669 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
670 return p + taglen + 1;
671 }
672 return NULL;
673 }
674
675 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
676 const char *tag)
677
678 {
679 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
680 }
681
682 /**
683 * Test if string s ends in string sub
684 * return 0 if match
685 **/
686 static int strrcmp(const char *s, const char *sub)
687 {
688 int slen, sublen;
689
690 if (!s || !sub)
691 return 1;
692
693 slen = strlen(s);
694 sublen = strlen(sub);
695
696 if ((slen == 0) || (sublen == 0))
697 return 1;
698
699 if (sublen > slen)
700 return 1;
701
702 return memcmp(s + slen - sublen, sub, sublen);
703 }
704
705 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
706 {
707 if (sym)
708 return elf->strtab + sym->st_name;
709 else
710 return "(unknown)";
711 }
712
713 static const char *sec_name(struct elf_info *elf, int secindex)
714 {
715 Elf_Shdr *sechdrs = elf->sechdrs;
716 return (void *)elf->hdr +
717 elf->sechdrs[elf->secindex_strings].sh_offset +
718 sechdrs[secindex].sh_name;
719 }
720
721 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
722 {
723 return (void *)elf->hdr +
724 elf->sechdrs[elf->secindex_strings].sh_offset +
725 sechdr->sh_name;
726 }
727
728 /* if sym is empty or point to a string
729 * like ".[0-9]+" then return 1.
730 * This is the optional prefix added by ld to some sections
731 */
732 static int number_prefix(const char *sym)
733 {
734 if (*sym++ == '\0')
735 return 1;
736 if (*sym != '.')
737 return 0;
738 do {
739 char c = *sym++;
740 if (c < '0' || c > '9')
741 return 0;
742 } while (*sym);
743 return 1;
744 }
745
746 /* The pattern is an array of simple patterns.
747 * "foo" will match an exact string equal to "foo"
748 * "*foo" will match a string that ends with "foo"
749 * "foo*" will match a string that begins with "foo"
750 * "foo$" will match a string equal to "foo" or "foo.1"
751 * where the '1' can be any number including several digits.
752 * The $ syntax is for sections where ld append a dot number
753 * to make section name unique.
754 */
755 static int match(const char *sym, const char * const pat[])
756 {
757 const char *p;
758 while (*pat) {
759 p = *pat++;
760 const char *endp = p + strlen(p) - 1;
761
762 /* "*foo" */
763 if (*p == '*') {
764 if (strrcmp(sym, p + 1) == 0)
765 return 1;
766 }
767 /* "foo*" */
768 else if (*endp == '*') {
769 if (strncmp(sym, p, strlen(p) - 1) == 0)
770 return 1;
771 }
772 /* "foo$" */
773 else if (*endp == '$') {
774 if (strncmp(sym, p, strlen(p) - 1) == 0) {
775 if (number_prefix(sym + strlen(p) - 1))
776 return 1;
777 }
778 }
779 /* no wildcards */
780 else {
781 if (strcmp(p, sym) == 0)
782 return 1;
783 }
784 }
785 /* no match */
786 return 0;
787 }
788
789 /* sections that we do not want to do full section mismatch check on */
790 static const char *section_white_list[] =
791 {
792 ".comment*",
793 ".debug*",
794 ".GCC-command-line", /* mn10300 */
795 ".mdebug*", /* alpha, score, mips etc. */
796 ".pdr", /* alpha, score, mips etc. */
797 ".stab*",
798 ".note*",
799 ".got*",
800 ".toc*",
801 NULL
802 };
803
804 /*
805 * This is used to find sections missing the SHF_ALLOC flag.
806 * The cause of this is often a section specified in assembler
807 * without "ax" / "aw".
808 */
809 static void check_section(const char *modname, struct elf_info *elf,
810 Elf_Shdr *sechdr)
811 {
812 const char *sec = sech_name(elf, sechdr);
813
814 if (sechdr->sh_type == SHT_PROGBITS &&
815 !(sechdr->sh_flags & SHF_ALLOC) &&
816 !match(sec, section_white_list)) {
817 warn("%s (%s): unexpected non-allocatable section.\n"
818 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
819 "Note that for example <linux/init.h> contains\n"
820 "section definitions for use in .S files.\n\n",
821 modname, sec);
822 }
823 }
824
825
826
827 #define ALL_INIT_DATA_SECTIONS \
828 ".init.setup$", ".init.rodata$", \
829 ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \
830 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
831 #define ALL_EXIT_DATA_SECTIONS \
832 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
833
834 #define ALL_INIT_TEXT_SECTIONS \
835 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
836 #define ALL_EXIT_TEXT_SECTIONS \
837 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
838
839 #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \
840 MEM_INIT_SECTIONS
841 #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \
842 MEM_EXIT_SECTIONS
843
844 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
845 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
846
847 #define DATA_SECTIONS ".data$", ".data.rel$"
848 #define TEXT_SECTIONS ".text$"
849
850 #define INIT_SECTIONS ".init.*"
851 #define DEV_INIT_SECTIONS ".devinit.*"
852 #define CPU_INIT_SECTIONS ".cpuinit.*"
853 #define MEM_INIT_SECTIONS ".meminit.*"
854
855 #define EXIT_SECTIONS ".exit.*"
856 #define DEV_EXIT_SECTIONS ".devexit.*"
857 #define CPU_EXIT_SECTIONS ".cpuexit.*"
858 #define MEM_EXIT_SECTIONS ".memexit.*"
859
860 /* init data sections */
861 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
862
863 /* all init sections */
864 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
865
866 /* All init and exit sections (code + data) */
867 static const char *init_exit_sections[] =
868 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
869
870 /* data section */
871 static const char *data_sections[] = { DATA_SECTIONS, NULL };
872
873
874 /* symbols in .data that may refer to init/exit sections */
875 #define DEFAULT_SYMBOL_WHITE_LIST \
876 "*driver", \
877 "*_template", /* scsi uses *_template a lot */ \
878 "*_timer", /* arm uses ops structures named _timer a lot */ \
879 "*_sht", /* scsi also used *_sht to some extent */ \
880 "*_ops", \
881 "*_probe", \
882 "*_probe_one", \
883 "*_console"
884
885 static const char *head_sections[] = { ".head.text*", NULL };
886 static const char *linker_symbols[] =
887 { "__init_begin", "_sinittext", "_einittext", NULL };
888
889 enum mismatch {
890 TEXT_TO_ANY_INIT,
891 DATA_TO_ANY_INIT,
892 TEXT_TO_ANY_EXIT,
893 DATA_TO_ANY_EXIT,
894 XXXINIT_TO_SOME_INIT,
895 XXXEXIT_TO_SOME_EXIT,
896 ANY_INIT_TO_ANY_EXIT,
897 ANY_EXIT_TO_ANY_INIT,
898 EXPORT_TO_INIT_EXIT,
899 };
900
901 struct sectioncheck {
902 const char *fromsec[20];
903 const char *tosec[20];
904 enum mismatch mismatch;
905 const char *symbol_white_list[20];
906 };
907
908 const struct sectioncheck sectioncheck[] = {
909 /* Do not reference init/exit code/data from
910 * normal code and data
911 */
912 {
913 .fromsec = { TEXT_SECTIONS, NULL },
914 .tosec = { ALL_INIT_SECTIONS, NULL },
915 .mismatch = TEXT_TO_ANY_INIT,
916 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
917 },
918 {
919 .fromsec = { DATA_SECTIONS, NULL },
920 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
921 .mismatch = DATA_TO_ANY_INIT,
922 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
923 },
924 {
925 .fromsec = { DATA_SECTIONS, NULL },
926 .tosec = { INIT_SECTIONS, NULL },
927 .mismatch = DATA_TO_ANY_INIT,
928 .symbol_white_list = {
929 "*_template", "*_timer", "*_sht", "*_ops",
930 "*_probe", "*_probe_one", "*_console", NULL
931 },
932 },
933 {
934 .fromsec = { TEXT_SECTIONS, NULL },
935 .tosec = { ALL_EXIT_SECTIONS, NULL },
936 .mismatch = TEXT_TO_ANY_EXIT,
937 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
938 },
939 {
940 .fromsec = { DATA_SECTIONS, NULL },
941 .tosec = { ALL_EXIT_SECTIONS, NULL },
942 .mismatch = DATA_TO_ANY_EXIT,
943 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
944 },
945 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
946 {
947 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
948 .tosec = { INIT_SECTIONS, NULL },
949 .mismatch = XXXINIT_TO_SOME_INIT,
950 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
951 },
952 /* Do not reference cpuinit code/data from meminit code/data */
953 {
954 .fromsec = { MEM_INIT_SECTIONS, NULL },
955 .tosec = { CPU_INIT_SECTIONS, NULL },
956 .mismatch = XXXINIT_TO_SOME_INIT,
957 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
958 },
959 /* Do not reference meminit code/data from cpuinit code/data */
960 {
961 .fromsec = { CPU_INIT_SECTIONS, NULL },
962 .tosec = { MEM_INIT_SECTIONS, NULL },
963 .mismatch = XXXINIT_TO_SOME_INIT,
964 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
965 },
966 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
967 {
968 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
969 .tosec = { EXIT_SECTIONS, NULL },
970 .mismatch = XXXEXIT_TO_SOME_EXIT,
971 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
972 },
973 /* Do not reference cpuexit code/data from memexit code/data */
974 {
975 .fromsec = { MEM_EXIT_SECTIONS, NULL },
976 .tosec = { CPU_EXIT_SECTIONS, NULL },
977 .mismatch = XXXEXIT_TO_SOME_EXIT,
978 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
979 },
980 /* Do not reference memexit code/data from cpuexit code/data */
981 {
982 .fromsec = { CPU_EXIT_SECTIONS, NULL },
983 .tosec = { MEM_EXIT_SECTIONS, NULL },
984 .mismatch = XXXEXIT_TO_SOME_EXIT,
985 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
986 },
987 /* Do not use exit code/data from init code */
988 {
989 .fromsec = { ALL_INIT_SECTIONS, NULL },
990 .tosec = { ALL_EXIT_SECTIONS, NULL },
991 .mismatch = ANY_INIT_TO_ANY_EXIT,
992 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
993 },
994 /* Do not use init code/data from exit code */
995 {
996 .fromsec = { ALL_EXIT_SECTIONS, NULL },
997 .tosec = { ALL_INIT_SECTIONS, NULL },
998 .mismatch = ANY_EXIT_TO_ANY_INIT,
999 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1000 },
1001 /* Do not export init/exit functions or data */
1002 {
1003 .fromsec = { "__ksymtab*", NULL },
1004 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1005 .mismatch = EXPORT_TO_INIT_EXIT,
1006 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1007 }
1008 };
1009
1010 static const struct sectioncheck *section_mismatch(
1011 const char *fromsec, const char *tosec)
1012 {
1013 int i;
1014 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1015 const struct sectioncheck *check = &sectioncheck[0];
1016
1017 for (i = 0; i < elems; i++) {
1018 if (match(fromsec, check->fromsec) &&
1019 match(tosec, check->tosec))
1020 return check;
1021 check++;
1022 }
1023 return NULL;
1024 }
1025
1026 /**
1027 * Whitelist to allow certain references to pass with no warning.
1028 *
1029 * Pattern 1:
1030 * If a module parameter is declared __initdata and permissions=0
1031 * then this is legal despite the warning generated.
1032 * We cannot see value of permissions here, so just ignore
1033 * this pattern.
1034 * The pattern is identified by:
1035 * tosec = .init.data
1036 * fromsec = .data*
1037 * atsym =__param*
1038 *
1039 * Pattern 1a:
1040 * module_param_call() ops can refer to __init set function if permissions=0
1041 * The pattern is identified by:
1042 * tosec = .init.text
1043 * fromsec = .data*
1044 * atsym = __param_ops_*
1045 *
1046 * Pattern 2:
1047 * Many drivers utilise a *driver container with references to
1048 * add, remove, probe functions etc.
1049 * These functions may often be marked __devinit and we do not want to
1050 * warn here.
1051 * the pattern is identified by:
1052 * tosec = init or exit section
1053 * fromsec = data section
1054 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1055 * *probe_one, *_console, *_timer
1056 *
1057 * Pattern 3:
1058 * Whitelist all references from .head.text to any init section
1059 *
1060 * Pattern 4:
1061 * Some symbols belong to init section but still it is ok to reference
1062 * these from non-init sections as these symbols don't have any memory
1063 * allocated for them and symbol address and value are same. So even
1064 * if init section is freed, its ok to reference those symbols.
1065 * For ex. symbols marking the init section boundaries.
1066 * This pattern is identified by
1067 * refsymname = __init_begin, _sinittext, _einittext
1068 *
1069 **/
1070 static int secref_whitelist(const struct sectioncheck *mismatch,
1071 const char *fromsec, const char *fromsym,
1072 const char *tosec, const char *tosym)
1073 {
1074 /* Check for pattern 1 */
1075 if (match(tosec, init_data_sections) &&
1076 match(fromsec, data_sections) &&
1077 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1078 return 0;
1079
1080 /* Check for pattern 1a */
1081 if (strcmp(tosec, ".init.text") == 0 &&
1082 match(fromsec, data_sections) &&
1083 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1084 return 0;
1085
1086 /* Check for pattern 2 */
1087 if (match(tosec, init_exit_sections) &&
1088 match(fromsec, data_sections) &&
1089 match(fromsym, mismatch->symbol_white_list))
1090 return 0;
1091
1092 /* Check for pattern 3 */
1093 if (match(fromsec, head_sections) &&
1094 match(tosec, init_sections))
1095 return 0;
1096
1097 /* Check for pattern 4 */
1098 if (match(tosym, linker_symbols))
1099 return 0;
1100
1101 return 1;
1102 }
1103
1104 /**
1105 * Find symbol based on relocation record info.
1106 * In some cases the symbol supplied is a valid symbol so
1107 * return refsym. If st_name != 0 we assume this is a valid symbol.
1108 * In other cases the symbol needs to be looked up in the symbol table
1109 * based on section and address.
1110 * **/
1111 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1112 Elf_Sym *relsym)
1113 {
1114 Elf_Sym *sym;
1115 Elf_Sym *near = NULL;
1116 Elf64_Sword distance = 20;
1117 Elf64_Sword d;
1118 unsigned int relsym_secindex;
1119
1120 if (relsym->st_name != 0)
1121 return relsym;
1122
1123 relsym_secindex = get_secindex(elf, relsym);
1124 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1125 if (get_secindex(elf, sym) != relsym_secindex)
1126 continue;
1127 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1128 continue;
1129 if (sym->st_value == addr)
1130 return sym;
1131 /* Find a symbol nearby - addr are maybe negative */
1132 d = sym->st_value - addr;
1133 if (d < 0)
1134 d = addr - sym->st_value;
1135 if (d < distance) {
1136 distance = d;
1137 near = sym;
1138 }
1139 }
1140 /* We need a close match */
1141 if (distance < 20)
1142 return near;
1143 else
1144 return NULL;
1145 }
1146
1147 static inline int is_arm_mapping_symbol(const char *str)
1148 {
1149 return str[0] == '$' && strchr("atd", str[1])
1150 && (str[2] == '\0' || str[2] == '.');
1151 }
1152
1153 /*
1154 * If there's no name there, ignore it; likewise, ignore it if it's
1155 * one of the magic symbols emitted used by current ARM tools.
1156 *
1157 * Otherwise if find_symbols_between() returns those symbols, they'll
1158 * fail the whitelist tests and cause lots of false alarms ... fixable
1159 * only by merging __exit and __init sections into __text, bloating
1160 * the kernel (which is especially evil on embedded platforms).
1161 */
1162 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1163 {
1164 const char *name = elf->strtab + sym->st_name;
1165
1166 if (!name || !strlen(name))
1167 return 0;
1168 return !is_arm_mapping_symbol(name);
1169 }
1170
1171 /*
1172 * Find symbols before or equal addr and after addr - in the section sec.
1173 * If we find two symbols with equal offset prefer one with a valid name.
1174 * The ELF format may have a better way to detect what type of symbol
1175 * it is, but this works for now.
1176 **/
1177 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1178 const char *sec)
1179 {
1180 Elf_Sym *sym;
1181 Elf_Sym *near = NULL;
1182 Elf_Addr distance = ~0;
1183
1184 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1185 const char *symsec;
1186
1187 if (is_shndx_special(sym->st_shndx))
1188 continue;
1189 symsec = sec_name(elf, get_secindex(elf, sym));
1190 if (strcmp(symsec, sec) != 0)
1191 continue;
1192 if (!is_valid_name(elf, sym))
1193 continue;
1194 if (sym->st_value <= addr) {
1195 if ((addr - sym->st_value) < distance) {
1196 distance = addr - sym->st_value;
1197 near = sym;
1198 } else if ((addr - sym->st_value) == distance) {
1199 near = sym;
1200 }
1201 }
1202 }
1203 return near;
1204 }
1205
1206 /*
1207 * Convert a section name to the function/data attribute
1208 * .init.text => __init
1209 * .cpuinit.data => __cpudata
1210 * .memexitconst => __memconst
1211 * etc.
1212 */
1213 static char *sec2annotation(const char *s)
1214 {
1215 if (match(s, init_exit_sections)) {
1216 char *p = malloc(20);
1217 char *r = p;
1218
1219 *p++ = '_';
1220 *p++ = '_';
1221 if (*s == '.')
1222 s++;
1223 while (*s && *s != '.')
1224 *p++ = *s++;
1225 *p = '\0';
1226 if (*s == '.')
1227 s++;
1228 if (strstr(s, "rodata") != NULL)
1229 strcat(p, "const ");
1230 else if (strstr(s, "data") != NULL)
1231 strcat(p, "data ");
1232 else
1233 strcat(p, " ");
1234 return r; /* we leak her but we do not care */
1235 } else {
1236 return strdup("");
1237 }
1238 }
1239
1240 static int is_function(Elf_Sym *sym)
1241 {
1242 if (sym)
1243 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1244 else
1245 return -1;
1246 }
1247
1248 /*
1249 * Print a warning about a section mismatch.
1250 * Try to find symbols near it so user can find it.
1251 * Check whitelist before warning - it may be a false positive.
1252 */
1253 static void report_sec_mismatch(const char *modname,
1254 const struct sectioncheck *mismatch,
1255 const char *fromsec,
1256 unsigned long long fromaddr,
1257 const char *fromsym,
1258 int from_is_func,
1259 const char *tosec, const char *tosym,
1260 int to_is_func)
1261 {
1262 const char *from, *from_p;
1263 const char *to, *to_p;
1264 char *prl_from;
1265 char *prl_to;
1266
1267 switch (from_is_func) {
1268 case 0: from = "variable"; from_p = ""; break;
1269 case 1: from = "function"; from_p = "()"; break;
1270 default: from = "(unknown reference)"; from_p = ""; break;
1271 }
1272 switch (to_is_func) {
1273 case 0: to = "variable"; to_p = ""; break;
1274 case 1: to = "function"; to_p = "()"; break;
1275 default: to = "(unknown reference)"; to_p = ""; break;
1276 }
1277
1278 sec_mismatch_count++;
1279 if (!sec_mismatch_verbose)
1280 return;
1281
1282 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1283 "to the %s %s:%s%s\n",
1284 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1285 tosym, to_p);
1286
1287 switch (mismatch->mismatch) {
1288 case TEXT_TO_ANY_INIT:
1289 prl_from = sec2annotation(fromsec);
1290 prl_to = sec2annotation(tosec);
1291 fprintf(stderr,
1292 "The function %s%s() references\n"
1293 "the %s %s%s%s.\n"
1294 "This is often because %s lacks a %s\n"
1295 "annotation or the annotation of %s is wrong.\n",
1296 prl_from, fromsym,
1297 to, prl_to, tosym, to_p,
1298 fromsym, prl_to, tosym);
1299 free(prl_from);
1300 free(prl_to);
1301 break;
1302 case DATA_TO_ANY_INIT: {
1303 prl_to = sec2annotation(tosec);
1304 const char *const *s = mismatch->symbol_white_list;
1305 fprintf(stderr,
1306 "The variable %s references\n"
1307 "the %s %s%s%s\n"
1308 "If the reference is valid then annotate the\n"
1309 "variable with __init* or __refdata (see linux/init.h) "
1310 "or name the variable:\n",
1311 fromsym, to, prl_to, tosym, to_p);
1312 while (*s)
1313 fprintf(stderr, "%s, ", *s++);
1314 fprintf(stderr, "\n");
1315 free(prl_to);
1316 break;
1317 }
1318 case TEXT_TO_ANY_EXIT:
1319 prl_to = sec2annotation(tosec);
1320 fprintf(stderr,
1321 "The function %s() references a %s in an exit section.\n"
1322 "Often the %s %s%s has valid usage outside the exit section\n"
1323 "and the fix is to remove the %sannotation of %s.\n",
1324 fromsym, to, to, tosym, to_p, prl_to, tosym);
1325 free(prl_to);
1326 break;
1327 case DATA_TO_ANY_EXIT: {
1328 prl_to = sec2annotation(tosec);
1329 const char *const *s = mismatch->symbol_white_list;
1330 fprintf(stderr,
1331 "The variable %s references\n"
1332 "the %s %s%s%s\n"
1333 "If the reference is valid then annotate the\n"
1334 "variable with __exit* (see linux/init.h) or "
1335 "name the variable:\n",
1336 fromsym, to, prl_to, tosym, to_p);
1337 while (*s)
1338 fprintf(stderr, "%s, ", *s++);
1339 fprintf(stderr, "\n");
1340 free(prl_to);
1341 break;
1342 }
1343 case XXXINIT_TO_SOME_INIT:
1344 case XXXEXIT_TO_SOME_EXIT:
1345 prl_from = sec2annotation(fromsec);
1346 prl_to = sec2annotation(tosec);
1347 fprintf(stderr,
1348 "The %s %s%s%s references\n"
1349 "a %s %s%s%s.\n"
1350 "If %s is only used by %s then\n"
1351 "annotate %s with a matching annotation.\n",
1352 from, prl_from, fromsym, from_p,
1353 to, prl_to, tosym, to_p,
1354 tosym, fromsym, tosym);
1355 free(prl_from);
1356 free(prl_to);
1357 break;
1358 case ANY_INIT_TO_ANY_EXIT:
1359 prl_from = sec2annotation(fromsec);
1360 prl_to = sec2annotation(tosec);
1361 fprintf(stderr,
1362 "The %s %s%s%s references\n"
1363 "a %s %s%s%s.\n"
1364 "This is often seen when error handling "
1365 "in the init function\n"
1366 "uses functionality in the exit path.\n"
1367 "The fix is often to remove the %sannotation of\n"
1368 "%s%s so it may be used outside an exit section.\n",
1369 from, prl_from, fromsym, from_p,
1370 to, prl_to, tosym, to_p,
1371 prl_to, tosym, to_p);
1372 free(prl_from);
1373 free(prl_to);
1374 break;
1375 case ANY_EXIT_TO_ANY_INIT:
1376 prl_from = sec2annotation(fromsec);
1377 prl_to = sec2annotation(tosec);
1378 fprintf(stderr,
1379 "The %s %s%s%s references\n"
1380 "a %s %s%s%s.\n"
1381 "This is often seen when error handling "
1382 "in the exit function\n"
1383 "uses functionality in the init path.\n"
1384 "The fix is often to remove the %sannotation of\n"
1385 "%s%s so it may be used outside an init section.\n",
1386 from, prl_from, fromsym, from_p,
1387 to, prl_to, tosym, to_p,
1388 prl_to, tosym, to_p);
1389 free(prl_from);
1390 free(prl_to);
1391 break;
1392 case EXPORT_TO_INIT_EXIT:
1393 prl_to = sec2annotation(tosec);
1394 fprintf(stderr,
1395 "The symbol %s is exported and annotated %s\n"
1396 "Fix this by removing the %sannotation of %s "
1397 "or drop the export.\n",
1398 tosym, prl_to, prl_to, tosym);
1399 free(prl_to);
1400 break;
1401 }
1402 fprintf(stderr, "\n");
1403 }
1404
1405 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1406 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1407 {
1408 const char *tosec;
1409 const struct sectioncheck *mismatch;
1410
1411 tosec = sec_name(elf, get_secindex(elf, sym));
1412 mismatch = section_mismatch(fromsec, tosec);
1413 if (mismatch) {
1414 Elf_Sym *to;
1415 Elf_Sym *from;
1416 const char *tosym;
1417 const char *fromsym;
1418
1419 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1420 fromsym = sym_name(elf, from);
1421 to = find_elf_symbol(elf, r->r_addend, sym);
1422 tosym = sym_name(elf, to);
1423
1424 /* check whitelist - we may ignore it */
1425 if (secref_whitelist(mismatch,
1426 fromsec, fromsym, tosec, tosym)) {
1427 report_sec_mismatch(modname, mismatch,
1428 fromsec, r->r_offset, fromsym,
1429 is_function(from), tosec, tosym,
1430 is_function(to));
1431 }
1432 }
1433 }
1434
1435 static unsigned int *reloc_location(struct elf_info *elf,
1436 Elf_Shdr *sechdr, Elf_Rela *r)
1437 {
1438 Elf_Shdr *sechdrs = elf->sechdrs;
1439 int section = shndx2secindex(sechdr->sh_info);
1440
1441 return (void *)elf->hdr + sechdrs[section].sh_offset +
1442 r->r_offset - sechdrs[section].sh_addr;
1443 }
1444
1445 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1446 {
1447 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1448 unsigned int *location = reloc_location(elf, sechdr, r);
1449
1450 switch (r_typ) {
1451 case R_386_32:
1452 r->r_addend = TO_NATIVE(*location);
1453 break;
1454 case R_386_PC32:
1455 r->r_addend = TO_NATIVE(*location) + 4;
1456 /* For CONFIG_RELOCATABLE=y */
1457 if (elf->hdr->e_type == ET_EXEC)
1458 r->r_addend += r->r_offset;
1459 break;
1460 }
1461 return 0;
1462 }
1463
1464 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1465 {
1466 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1467
1468 switch (r_typ) {
1469 case R_ARM_ABS32:
1470 /* From ARM ABI: (S + A) | T */
1471 r->r_addend = (int)(long)
1472 (elf->symtab_start + ELF_R_SYM(r->r_info));
1473 break;
1474 case R_ARM_PC24:
1475 /* From ARM ABI: ((S + A) | T) - P */
1476 r->r_addend = (int)(long)(elf->hdr +
1477 sechdr->sh_offset +
1478 (r->r_offset - sechdr->sh_addr));
1479 break;
1480 default:
1481 return 1;
1482 }
1483 return 0;
1484 }
1485
1486 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1487 {
1488 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1489 unsigned int *location = reloc_location(elf, sechdr, r);
1490 unsigned int inst;
1491
1492 if (r_typ == R_MIPS_HI16)
1493 return 1; /* skip this */
1494 inst = TO_NATIVE(*location);
1495 switch (r_typ) {
1496 case R_MIPS_LO16:
1497 r->r_addend = inst & 0xffff;
1498 break;
1499 case R_MIPS_26:
1500 r->r_addend = (inst & 0x03ffffff) << 2;
1501 break;
1502 case R_MIPS_32:
1503 r->r_addend = inst;
1504 break;
1505 }
1506 return 0;
1507 }
1508
1509 static void section_rela(const char *modname, struct elf_info *elf,
1510 Elf_Shdr *sechdr)
1511 {
1512 Elf_Sym *sym;
1513 Elf_Rela *rela;
1514 Elf_Rela r;
1515 unsigned int r_sym;
1516 const char *fromsec;
1517
1518 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1519 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1520
1521 fromsec = sech_name(elf, sechdr);
1522 fromsec += strlen(".rela");
1523 /* if from section (name) is know good then skip it */
1524 if (match(fromsec, section_white_list))
1525 return;
1526
1527 for (rela = start; rela < stop; rela++) {
1528 r.r_offset = TO_NATIVE(rela->r_offset);
1529 #if KERNEL_ELFCLASS == ELFCLASS64
1530 if (elf->hdr->e_machine == EM_MIPS) {
1531 unsigned int r_typ;
1532 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1533 r_sym = TO_NATIVE(r_sym);
1534 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1535 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1536 } else {
1537 r.r_info = TO_NATIVE(rela->r_info);
1538 r_sym = ELF_R_SYM(r.r_info);
1539 }
1540 #else
1541 r.r_info = TO_NATIVE(rela->r_info);
1542 r_sym = ELF_R_SYM(r.r_info);
1543 #endif
1544 r.r_addend = TO_NATIVE(rela->r_addend);
1545 sym = elf->symtab_start + r_sym;
1546 /* Skip special sections */
1547 if (is_shndx_special(sym->st_shndx))
1548 continue;
1549 check_section_mismatch(modname, elf, &r, sym, fromsec);
1550 }
1551 }
1552
1553 static void section_rel(const char *modname, struct elf_info *elf,
1554 Elf_Shdr *sechdr)
1555 {
1556 Elf_Sym *sym;
1557 Elf_Rel *rel;
1558 Elf_Rela r;
1559 unsigned int r_sym;
1560 const char *fromsec;
1561
1562 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1563 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1564
1565 fromsec = sech_name(elf, sechdr);
1566 fromsec += strlen(".rel");
1567 /* if from section (name) is know good then skip it */
1568 if (match(fromsec, section_white_list))
1569 return;
1570
1571 for (rel = start; rel < stop; rel++) {
1572 r.r_offset = TO_NATIVE(rel->r_offset);
1573 #if KERNEL_ELFCLASS == ELFCLASS64
1574 if (elf->hdr->e_machine == EM_MIPS) {
1575 unsigned int r_typ;
1576 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1577 r_sym = TO_NATIVE(r_sym);
1578 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1579 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1580 } else {
1581 r.r_info = TO_NATIVE(rel->r_info);
1582 r_sym = ELF_R_SYM(r.r_info);
1583 }
1584 #else
1585 r.r_info = TO_NATIVE(rel->r_info);
1586 r_sym = ELF_R_SYM(r.r_info);
1587 #endif
1588 r.r_addend = 0;
1589 switch (elf->hdr->e_machine) {
1590 case EM_386:
1591 if (addend_386_rel(elf, sechdr, &r))
1592 continue;
1593 break;
1594 case EM_ARM:
1595 if (addend_arm_rel(elf, sechdr, &r))
1596 continue;
1597 break;
1598 case EM_MIPS:
1599 if (addend_mips_rel(elf, sechdr, &r))
1600 continue;
1601 break;
1602 }
1603 sym = elf->symtab_start + r_sym;
1604 /* Skip special sections */
1605 if (is_shndx_special(sym->st_shndx))
1606 continue;
1607 check_section_mismatch(modname, elf, &r, sym, fromsec);
1608 }
1609 }
1610
1611 /**
1612 * A module includes a number of sections that are discarded
1613 * either when loaded or when used as built-in.
1614 * For loaded modules all functions marked __init and all data
1615 * marked __initdata will be discarded when the module has been intialized.
1616 * Likewise for modules used built-in the sections marked __exit
1617 * are discarded because __exit marked function are supposed to be called
1618 * only when a module is unloaded which never happens for built-in modules.
1619 * The check_sec_ref() function traverses all relocation records
1620 * to find all references to a section that reference a section that will
1621 * be discarded and warns about it.
1622 **/
1623 static void check_sec_ref(struct module *mod, const char *modname,
1624 struct elf_info *elf)
1625 {
1626 int i;
1627 Elf_Shdr *sechdrs = elf->sechdrs;
1628
1629 /* Walk through all sections */
1630 for (i = 0; i < elf->num_sections; i++) {
1631 check_section(modname, elf, &elf->sechdrs[i]);
1632 /* We want to process only relocation sections and not .init */
1633 if (sechdrs[i].sh_type == SHT_RELA)
1634 section_rela(modname, elf, &elf->sechdrs[i]);
1635 else if (sechdrs[i].sh_type == SHT_REL)
1636 section_rel(modname, elf, &elf->sechdrs[i]);
1637 }
1638 }
1639
1640 static void read_symbols(char *modname)
1641 {
1642 const char *symname;
1643 char *version;
1644 char *license;
1645 struct module *mod;
1646 struct elf_info info = { };
1647 Elf_Sym *sym;
1648
1649 if (!parse_elf(&info, modname))
1650 return;
1651
1652 mod = new_module(modname);
1653
1654 /* When there's no vmlinux, don't print warnings about
1655 * unresolved symbols (since there'll be too many ;) */
1656 if (is_vmlinux(modname)) {
1657 have_vmlinux = 1;
1658 mod->skip = 1;
1659 }
1660
1661 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1662 if (info.modinfo && !license && !is_vmlinux(modname))
1663 warn("modpost: missing MODULE_LICENSE() in %s\n"
1664 "see include/linux/module.h for "
1665 "more information\n", modname);
1666 while (license) {
1667 if (license_is_gpl_compatible(license))
1668 mod->gpl_compatible = 1;
1669 else {
1670 mod->gpl_compatible = 0;
1671 break;
1672 }
1673 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1674 "license", license);
1675 }
1676
1677 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1678 symname = info.strtab + sym->st_name;
1679
1680 handle_modversions(mod, &info, sym, symname);
1681 handle_moddevtable(mod, &info, sym, symname);
1682 }
1683 if (!is_vmlinux(modname) ||
1684 (is_vmlinux(modname) && vmlinux_section_warnings))
1685 check_sec_ref(mod, modname, &info);
1686
1687 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1688 if (version)
1689 maybe_frob_rcs_version(modname, version, info.modinfo,
1690 version - (char *)info.hdr);
1691 if (version || (all_versions && !is_vmlinux(modname)))
1692 get_src_version(modname, mod->srcversion,
1693 sizeof(mod->srcversion)-1);
1694
1695 parse_elf_finish(&info);
1696
1697 /* Our trick to get versioning for module struct etc. - it's
1698 * never passed as an argument to an exported function, so
1699 * the automatic versioning doesn't pick it up, but it's really
1700 * important anyhow */
1701 if (modversions)
1702 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1703 }
1704
1705 #define SZ 500
1706
1707 /* We first write the generated file into memory using the
1708 * following helper, then compare to the file on disk and
1709 * only update the later if anything changed */
1710
1711 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1712 const char *fmt, ...)
1713 {
1714 char tmp[SZ];
1715 int len;
1716 va_list ap;
1717
1718 va_start(ap, fmt);
1719 len = vsnprintf(tmp, SZ, fmt, ap);
1720 buf_write(buf, tmp, len);
1721 va_end(ap);
1722 }
1723
1724 void buf_write(struct buffer *buf, const char *s, int len)
1725 {
1726 if (buf->size - buf->pos < len) {
1727 buf->size += len + SZ;
1728 buf->p = realloc(buf->p, buf->size);
1729 }
1730 strncpy(buf->p + buf->pos, s, len);
1731 buf->pos += len;
1732 }
1733
1734 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1735 {
1736 const char *e = is_vmlinux(m) ?"":".ko";
1737
1738 switch (exp) {
1739 case export_gpl:
1740 warn("modpost: GPL-incompatible module %s%s "
1741 "uses GPL-only symbol '%s'\n", m, e, s);
1742 break;
1743 case export_unused_gpl:
1744 warn("modpost: GPL-incompatible module %s%s "
1745 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1746 break;
1747 case export_gpl_future:
1748 warn("modpost: GPL-incompatible module %s%s "
1749 "uses future GPL-only symbol '%s'\n", m, e, s);
1750 break;
1751 case export_plain:
1752 case export_unused:
1753 case export_unknown:
1754 /* ignore */
1755 break;
1756 }
1757 }
1758
1759 static void check_for_unused(enum export exp, const char *m, const char *s)
1760 {
1761 const char *e = is_vmlinux(m) ?"":".ko";
1762
1763 switch (exp) {
1764 case export_unused:
1765 case export_unused_gpl:
1766 warn("modpost: module %s%s "
1767 "uses symbol '%s' marked UNUSED\n", m, e, s);
1768 break;
1769 default:
1770 /* ignore */
1771 break;
1772 }
1773 }
1774
1775 static void check_exports(struct module *mod)
1776 {
1777 struct symbol *s, *exp;
1778
1779 for (s = mod->unres; s; s = s->next) {
1780 const char *basename;
1781 exp = find_symbol(s->name);
1782 if (!exp || exp->module == mod)
1783 continue;
1784 basename = strrchr(mod->name, '/');
1785 if (basename)
1786 basename++;
1787 else
1788 basename = mod->name;
1789 if (!mod->gpl_compatible)
1790 check_for_gpl_usage(exp->export, basename, exp->name);
1791 check_for_unused(exp->export, basename, exp->name);
1792 }
1793 }
1794
1795 /**
1796 * Header for the generated file
1797 **/
1798 static void add_header(struct buffer *b, struct module *mod)
1799 {
1800 buf_printf(b, "#include <linux/module.h>\n");
1801 buf_printf(b, "#include <linux/vermagic.h>\n");
1802 buf_printf(b, "#include <linux/compiler.h>\n");
1803 buf_printf(b, "\n");
1804 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1805 buf_printf(b, "\n");
1806 buf_printf(b, "struct module __this_module\n");
1807 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1808 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1809 if (mod->has_init)
1810 buf_printf(b, " .init = init_module,\n");
1811 if (mod->has_cleanup)
1812 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1813 " .exit = cleanup_module,\n"
1814 "#endif\n");
1815 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1816 buf_printf(b, "};\n");
1817 }
1818
1819 static void add_staging_flag(struct buffer *b, const char *name)
1820 {
1821 static const char *staging_dir = "drivers/staging";
1822
1823 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1824 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1825 }
1826
1827 /**
1828 * Record CRCs for unresolved symbols
1829 **/
1830 static int add_versions(struct buffer *b, struct module *mod)
1831 {
1832 struct symbol *s, *exp;
1833 int err = 0;
1834
1835 for (s = mod->unres; s; s = s->next) {
1836 exp = find_symbol(s->name);
1837 if (!exp || exp->module == mod) {
1838 if (have_vmlinux && !s->weak) {
1839 if (warn_unresolved) {
1840 warn("\"%s\" [%s.ko] undefined!\n",
1841 s->name, mod->name);
1842 } else {
1843 merror("\"%s\" [%s.ko] undefined!\n",
1844 s->name, mod->name);
1845 err = 1;
1846 }
1847 }
1848 continue;
1849 }
1850 s->module = exp->module;
1851 s->crc_valid = exp->crc_valid;
1852 s->crc = exp->crc;
1853 }
1854
1855 if (!modversions)
1856 return err;
1857
1858 buf_printf(b, "\n");
1859 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1860 buf_printf(b, "__used\n");
1861 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1862
1863 for (s = mod->unres; s; s = s->next) {
1864 if (!s->module)
1865 continue;
1866 if (!s->crc_valid) {
1867 warn("\"%s\" [%s.ko] has no CRC!\n",
1868 s->name, mod->name);
1869 continue;
1870 }
1871 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1872 }
1873
1874 buf_printf(b, "};\n");
1875
1876 return err;
1877 }
1878
1879 static void add_depends(struct buffer *b, struct module *mod,
1880 struct module *modules)
1881 {
1882 struct symbol *s;
1883 struct module *m;
1884 int first = 1;
1885
1886 for (m = modules; m; m = m->next)
1887 m->seen = is_vmlinux(m->name);
1888
1889 buf_printf(b, "\n");
1890 buf_printf(b, "static const char __module_depends[]\n");
1891 buf_printf(b, "__used\n");
1892 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1893 buf_printf(b, "\"depends=");
1894 for (s = mod->unres; s; s = s->next) {
1895 const char *p;
1896 if (!s->module)
1897 continue;
1898
1899 if (s->module->seen)
1900 continue;
1901
1902 s->module->seen = 1;
1903 p = strrchr(s->module->name, '/');
1904 if (p)
1905 p++;
1906 else
1907 p = s->module->name;
1908 buf_printf(b, "%s%s", first ? "" : ",", p);
1909 first = 0;
1910 }
1911 buf_printf(b, "\";\n");
1912 }
1913
1914 static void add_srcversion(struct buffer *b, struct module *mod)
1915 {
1916 if (mod->srcversion[0]) {
1917 buf_printf(b, "\n");
1918 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1919 mod->srcversion);
1920 }
1921 }
1922
1923 static void write_if_changed(struct buffer *b, const char *fname)
1924 {
1925 char *tmp;
1926 FILE *file;
1927 struct stat st;
1928
1929 file = fopen(fname, "r");
1930 if (!file)
1931 goto write;
1932
1933 if (fstat(fileno(file), &st) < 0)
1934 goto close_write;
1935
1936 if (st.st_size != b->pos)
1937 goto close_write;
1938
1939 tmp = NOFAIL(malloc(b->pos));
1940 if (fread(tmp, 1, b->pos, file) != b->pos)
1941 goto free_write;
1942
1943 if (memcmp(tmp, b->p, b->pos) != 0)
1944 goto free_write;
1945
1946 free(tmp);
1947 fclose(file);
1948 return;
1949
1950 free_write:
1951 free(tmp);
1952 close_write:
1953 fclose(file);
1954 write:
1955 file = fopen(fname, "w");
1956 if (!file) {
1957 perror(fname);
1958 exit(1);
1959 }
1960 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1961 perror(fname);
1962 exit(1);
1963 }
1964 fclose(file);
1965 }
1966
1967 /* parse Module.symvers file. line format:
1968 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1969 **/
1970 static void read_dump(const char *fname, unsigned int kernel)
1971 {
1972 unsigned long size, pos = 0;
1973 void *file = grab_file(fname, &size);
1974 char *line;
1975
1976 if (!file)
1977 /* No symbol versions, silently ignore */
1978 return;
1979
1980 while ((line = get_next_line(&pos, file, size))) {
1981 char *symname, *modname, *d, *export, *end;
1982 unsigned int crc;
1983 struct module *mod;
1984 struct symbol *s;
1985
1986 if (!(symname = strchr(line, '\t')))
1987 goto fail;
1988 *symname++ = '\0';
1989 if (!(modname = strchr(symname, '\t')))
1990 goto fail;
1991 *modname++ = '\0';
1992 if ((export = strchr(modname, '\t')) != NULL)
1993 *export++ = '\0';
1994 if (export && ((end = strchr(export, '\t')) != NULL))
1995 *end = '\0';
1996 crc = strtoul(line, &d, 16);
1997 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1998 goto fail;
1999 mod = find_module(modname);
2000 if (!mod) {
2001 if (is_vmlinux(modname))
2002 have_vmlinux = 1;
2003 mod = new_module(modname);
2004 mod->skip = 1;
2005 }
2006 s = sym_add_exported(symname, mod, export_no(export));
2007 s->kernel = kernel;
2008 s->preloaded = 1;
2009 sym_update_crc(symname, mod, crc, export_no(export));
2010 }
2011 return;
2012 fail:
2013 fatal("parse error in symbol dump file\n");
2014 }
2015
2016 /* For normal builds always dump all symbols.
2017 * For external modules only dump symbols
2018 * that are not read from kernel Module.symvers.
2019 **/
2020 static int dump_sym(struct symbol *sym)
2021 {
2022 if (!external_module)
2023 return 1;
2024 if (sym->vmlinux || sym->kernel)
2025 return 0;
2026 return 1;
2027 }
2028
2029 static void write_dump(const char *fname)
2030 {
2031 struct buffer buf = { };
2032 struct symbol *symbol;
2033 int n;
2034
2035 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2036 symbol = symbolhash[n];
2037 while (symbol) {
2038 if (dump_sym(symbol))
2039 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2040 symbol->crc, symbol->name,
2041 symbol->module->name,
2042 export_str(symbol->export));
2043 symbol = symbol->next;
2044 }
2045 }
2046 write_if_changed(&buf, fname);
2047 }
2048
2049 struct ext_sym_list {
2050 struct ext_sym_list *next;
2051 const char *file;
2052 };
2053
2054 int main(int argc, char **argv)
2055 {
2056 struct module *mod;
2057 struct buffer buf = { };
2058 char *kernel_read = NULL, *module_read = NULL;
2059 char *dump_write = NULL;
2060 int opt;
2061 int err;
2062 struct ext_sym_list *extsym_iter;
2063 struct ext_sym_list *extsym_start = NULL;
2064
2065 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2066 switch (opt) {
2067 case 'i':
2068 kernel_read = optarg;
2069 break;
2070 case 'I':
2071 module_read = optarg;
2072 external_module = 1;
2073 break;
2074 case 'c':
2075 cross_build = 1;
2076 break;
2077 case 'e':
2078 external_module = 1;
2079 extsym_iter =
2080 NOFAIL(malloc(sizeof(*extsym_iter)));
2081 extsym_iter->next = extsym_start;
2082 extsym_iter->file = optarg;
2083 extsym_start = extsym_iter;
2084 break;
2085 case 'm':
2086 modversions = 1;
2087 break;
2088 case 'o':
2089 dump_write = optarg;
2090 break;
2091 case 'a':
2092 all_versions = 1;
2093 break;
2094 case 's':
2095 vmlinux_section_warnings = 0;
2096 break;
2097 case 'S':
2098 sec_mismatch_verbose = 0;
2099 break;
2100 case 'w':
2101 warn_unresolved = 1;
2102 break;
2103 default:
2104 exit(1);
2105 }
2106 }
2107
2108 if (kernel_read)
2109 read_dump(kernel_read, 1);
2110 if (module_read)
2111 read_dump(module_read, 0);
2112 while (extsym_start) {
2113 read_dump(extsym_start->file, 0);
2114 extsym_iter = extsym_start->next;
2115 free(extsym_start);
2116 extsym_start = extsym_iter;
2117 }
2118
2119 while (optind < argc)
2120 read_symbols(argv[optind++]);
2121
2122 for (mod = modules; mod; mod = mod->next) {
2123 if (mod->skip)
2124 continue;
2125 check_exports(mod);
2126 }
2127
2128 err = 0;
2129
2130 for (mod = modules; mod; mod = mod->next) {
2131 char fname[strlen(mod->name) + 10];
2132
2133 if (mod->skip)
2134 continue;
2135
2136 buf.pos = 0;
2137
2138 add_header(&buf, mod);
2139 add_staging_flag(&buf, mod->name);
2140 err |= add_versions(&buf, mod);
2141 add_depends(&buf, mod, modules);
2142 add_moddevtable(&buf, mod);
2143 add_srcversion(&buf, mod);
2144
2145 sprintf(fname, "%s.mod.c", mod->name);
2146 write_if_changed(&buf, fname);
2147 }
2148
2149 if (dump_write)
2150 write_dump(dump_write);
2151 if (sec_mismatch_count && !sec_mismatch_verbose)
2152 warn("modpost: Found %d section mismatch(es).\n"
2153 "To see full details build your kernel with:\n"
2154 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2155 sec_mismatch_count);
2156
2157 return err;
2158 }
Tomato firmware and modifications.