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mtd: refactor call to request_module
[linux-2.6/btrfs-unstable.git] / scripts / mod / modpost.c
blob62164348ecf7104e0a91671430702efbfb5fd610
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 <string.h>
18 #include <limits.h>
19 #include <stdbool.h>
20 #include "modpost.h"
21 #include "../../include/generated/autoconf.h"
22 #include "../../include/linux/license.h"
23 #include "../../include/linux/export.h"
24
25 /* Are we using CONFIG_MODVERSIONS? */
26 int modversions = 0;
27 /* Warn about undefined symbols? (do so if we have vmlinux) */
28 int have_vmlinux = 0;
29 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
30 static int all_versions = 0;
31 /* If we are modposting external module set to 1 */
32 static int external_module = 0;
33 /* Warn about section mismatch in vmlinux if set to 1 */
34 static int vmlinux_section_warnings = 1;
35 /* Only warn about unresolved symbols */
36 static int warn_unresolved = 0;
37 /* How a symbol is exported */
38 static int sec_mismatch_count = 0;
39 static int sec_mismatch_verbose = 1;
40
41 enum export {
42 export_plain, export_unused, export_gpl,
43 export_unused_gpl, export_gpl_future, export_unknown
44 };
45
46 #define PRINTF __attribute__ ((format (printf, 1, 2)))
47
48 PRINTF void fatal(const char *fmt, ...)
49 {
50 va_list arglist;
51
52 fprintf(stderr, "FATAL: ");
53
54 va_start(arglist, fmt);
55 vfprintf(stderr, fmt, arglist);
56 va_end(arglist);
57
58 exit(1);
59 }
60
61 PRINTF void warn(const char *fmt, ...)
62 {
63 va_list arglist;
64
65 fprintf(stderr, "WARNING: ");
66
67 va_start(arglist, fmt);
68 vfprintf(stderr, fmt, arglist);
69 va_end(arglist);
70 }
71
72 PRINTF void merror(const char *fmt, ...)
73 {
74 va_list arglist;
75
76 fprintf(stderr, "ERROR: ");
77
78 va_start(arglist, fmt);
79 vfprintf(stderr, fmt, arglist);
80 va_end(arglist);
81 }
82
83 static inline bool strends(const char *str, const char *postfix)
84 {
85 if (strlen(str) < strlen(postfix))
86 return false;
87
88 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
89 }
90
91 static int is_vmlinux(const char *modname)
92 {
93 const char *myname;
94
95 myname = strrchr(modname, '/');
96 if (myname)
97 myname++;
98 else
99 myname = modname;
100
101 return (strcmp(myname, "vmlinux") == 0) ||
102 (strcmp(myname, "vmlinux.o") == 0);
103 }
104
105 void *do_nofail(void *ptr, const char *expr)
106 {
107 if (!ptr)
108 fatal("modpost: Memory allocation failure: %s.\n", expr);
109
110 return ptr;
111 }
112
113 /* A list of all modules we processed */
114 static struct module *modules;
115
116 static struct module *find_module(char *modname)
117 {
118 struct module *mod;
119
120 for (mod = modules; mod; mod = mod->next)
121 if (strcmp(mod->name, modname) == 0)
122 break;
123 return mod;
124 }
125
126 static struct module *new_module(const char *modname)
127 {
128 struct module *mod;
129 char *p;
130
131 mod = NOFAIL(malloc(sizeof(*mod)));
132 memset(mod, 0, sizeof(*mod));
133 p = NOFAIL(strdup(modname));
134
135 /* strip trailing .o */
136 if (strends(p, ".o")) {
137 p[strlen(p) - 2] = '\0';
138 mod->is_dot_o = 1;
139 }
140
141 /* add to list */
142 mod->name = p;
143 mod->gpl_compatible = -1;
144 mod->next = modules;
145 modules = mod;
146
147 return mod;
148 }
149
150 /* A hash of all exported symbols,
151 * struct symbol is also used for lists of unresolved symbols */
152
153 #define SYMBOL_HASH_SIZE 1024
154
155 struct symbol {
156 struct symbol *next;
157 struct module *module;
158 unsigned int crc;
159 int crc_valid;
160 unsigned int weak:1;
161 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
162 unsigned int kernel:1; /* 1 if symbol is from kernel
163 * (only for external modules) **/
164 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
165 enum export export; /* Type of export */
166 char name[0];
167 };
168
169 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
170
171 /* This is based on the hash agorithm from gdbm, via tdb */
172 static inline unsigned int tdb_hash(const char *name)
173 {
174 unsigned value; /* Used to compute the hash value. */
175 unsigned i; /* Used to cycle through random values. */
176
177 /* Set the initial value from the key size. */
178 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
179 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
180
181 return (1103515243 * value + 12345);
182 }
183
184 /**
185 * Allocate a new symbols for use in the hash of exported symbols or
186 * the list of unresolved symbols per module
187 **/
188 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
189 struct symbol *next)
190 {
191 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
192
193 memset(s, 0, sizeof(*s));
194 strcpy(s->name, name);
195 s->weak = weak;
196 s->next = next;
197 return s;
198 }
199
200 /* For the hash of exported symbols */
201 static struct symbol *new_symbol(const char *name, struct module *module,
202 enum export export)
203 {
204 unsigned int hash;
205 struct symbol *new;
206
207 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
208 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
209 new->module = module;
210 new->export = export;
211 return new;
212 }
213
214 static struct symbol *find_symbol(const char *name)
215 {
216 struct symbol *s;
217
218 /* For our purposes, .foo matches foo. PPC64 needs this. */
219 if (name[0] == '.')
220 name++;
221
222 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
223 if (strcmp(s->name, name) == 0)
224 return s;
225 }
226 return NULL;
227 }
228
229 static struct {
230 const char *str;
231 enum export export;
232 } export_list[] = {
233 { .str = "EXPORT_SYMBOL", .export = export_plain },
234 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
235 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
236 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
237 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
238 { .str = "(unknown)", .export = export_unknown },
239 };
240
241
242 static const char *export_str(enum export ex)
243 {
244 return export_list[ex].str;
245 }
246
247 static enum export export_no(const char *s)
248 {
249 int i;
250
251 if (!s)
252 return export_unknown;
253 for (i = 0; export_list[i].export != export_unknown; i++) {
254 if (strcmp(export_list[i].str, s) == 0)
255 return export_list[i].export;
256 }
257 return export_unknown;
258 }
259
260 static const char *sec_name(struct elf_info *elf, int secindex);
261
262 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
263
264 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
265 {
266 const char *secname = sec_name(elf, sec);
267
268 if (strstarts(secname, "___ksymtab+"))
269 return export_plain;
270 else if (strstarts(secname, "___ksymtab_unused+"))
271 return export_unused;
272 else if (strstarts(secname, "___ksymtab_gpl+"))
273 return export_gpl;
274 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
275 return export_unused_gpl;
276 else if (strstarts(secname, "___ksymtab_gpl_future+"))
277 return export_gpl_future;
278 else
279 return export_unknown;
280 }
281
282 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
283 {
284 if (sec == elf->export_sec)
285 return export_plain;
286 else if (sec == elf->export_unused_sec)
287 return export_unused;
288 else if (sec == elf->export_gpl_sec)
289 return export_gpl;
290 else if (sec == elf->export_unused_gpl_sec)
291 return export_unused_gpl;
292 else if (sec == elf->export_gpl_future_sec)
293 return export_gpl_future;
294 else
295 return export_unknown;
296 }
297
298 /**
299 * Add an exported symbol - it may have already been added without a
300 * CRC, in this case just update the CRC
301 **/
302 static struct symbol *sym_add_exported(const char *name, struct module *mod,
303 enum export export)
304 {
305 struct symbol *s = find_symbol(name);
306
307 if (!s) {
308 s = new_symbol(name, mod, export);
309 } else {
310 if (!s->preloaded) {
311 warn("%s: '%s' exported twice. Previous export "
312 "was in %s%s\n", mod->name, name,
313 s->module->name,
314 is_vmlinux(s->module->name) ?"":".ko");
315 } else {
316 /* In case Modules.symvers was out of date */
317 s->module = mod;
318 }
319 }
320 s->preloaded = 0;
321 s->vmlinux = is_vmlinux(mod->name);
322 s->kernel = 0;
323 s->export = export;
324 return s;
325 }
326
327 static void sym_update_crc(const char *name, struct module *mod,
328 unsigned int crc, enum export export)
329 {
330 struct symbol *s = find_symbol(name);
331
332 if (!s)
333 s = new_symbol(name, mod, export);
334 s->crc = crc;
335 s->crc_valid = 1;
336 }
337
338 void *grab_file(const char *filename, unsigned long *size)
339 {
340 struct stat st;
341 void *map = MAP_FAILED;
342 int fd;
343
344 fd = open(filename, O_RDONLY);
345 if (fd < 0)
346 return NULL;
347 if (fstat(fd, &st))
348 goto failed;
349
350 *size = st.st_size;
351 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
352
353 failed:
354 close(fd);
355 if (map == MAP_FAILED)
356 return NULL;
357 return map;
358 }
359
360 /**
361 * Return a copy of the next line in a mmap'ed file.
362 * spaces in the beginning of the line is trimmed away.
363 * Return a pointer to a static buffer.
364 **/
365 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
366 {
367 static char line[4096];
368 int skip = 1;
369 size_t len = 0;
370 signed char *p = (signed char *)file + *pos;
371 char *s = line;
372
373 for (; *pos < size ; (*pos)++) {
374 if (skip && isspace(*p)) {
375 p++;
376 continue;
377 }
378 skip = 0;
379 if (*p != '\n' && (*pos < size)) {
380 len++;
381 *s++ = *p++;
382 if (len > 4095)
383 break; /* Too long, stop */
384 } else {
385 /* End of string */
386 *s = '\0';
387 return line;
388 }
389 }
390 /* End of buffer */
391 return NULL;
392 }
393
394 void release_file(void *file, unsigned long size)
395 {
396 munmap(file, size);
397 }
398
399 static int parse_elf(struct elf_info *info, const char *filename)
400 {
401 unsigned int i;
402 Elf_Ehdr *hdr;
403 Elf_Shdr *sechdrs;
404 Elf_Sym *sym;
405 const char *secstrings;
406 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
407
408 hdr = grab_file(filename, &info->size);
409 if (!hdr) {
410 perror(filename);
411 exit(1);
412 }
413 info->hdr = hdr;
414 if (info->size < sizeof(*hdr)) {
415 /* file too small, assume this is an empty .o file */
416 return 0;
417 }
418 /* Is this a valid ELF file? */
419 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
420 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
421 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
422 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
423 /* Not an ELF file - silently ignore it */
424 return 0;
425 }
426 /* Fix endianness in ELF header */
427 hdr->e_type = TO_NATIVE(hdr->e_type);
428 hdr->e_machine = TO_NATIVE(hdr->e_machine);
429 hdr->e_version = TO_NATIVE(hdr->e_version);
430 hdr->e_entry = TO_NATIVE(hdr->e_entry);
431 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
432 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
433 hdr->e_flags = TO_NATIVE(hdr->e_flags);
434 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
435 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
436 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
437 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
438 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
439 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
440 sechdrs = (void *)hdr + hdr->e_shoff;
441 info->sechdrs = sechdrs;
442
443 /* Check if file offset is correct */
444 if (hdr->e_shoff > info->size) {
445 fatal("section header offset=%lu in file '%s' is bigger than "
446 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
447 filename, info->size);
448 return 0;
449 }
450
451 if (hdr->e_shnum == SHN_UNDEF) {
452 /*
453 * There are more than 64k sections,
454 * read count from .sh_size.
455 */
456 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
457 }
458 else {
459 info->num_sections = hdr->e_shnum;
460 }
461 if (hdr->e_shstrndx == SHN_XINDEX) {
462 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
463 }
464 else {
465 info->secindex_strings = hdr->e_shstrndx;
466 }
467
468 /* Fix endianness in section headers */
469 for (i = 0; i < info->num_sections; i++) {
470 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
471 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
472 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
473 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
474 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
475 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
476 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
477 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
478 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
479 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
480 }
481 /* Find symbol table. */
482 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
483 for (i = 1; i < info->num_sections; i++) {
484 const char *secname;
485 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
486
487 if (!nobits && sechdrs[i].sh_offset > info->size) {
488 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
489 "sizeof(*hrd)=%zu\n", filename,
490 (unsigned long)sechdrs[i].sh_offset,
491 sizeof(*hdr));
492 return 0;
493 }
494 secname = secstrings + sechdrs[i].sh_name;
495 if (strcmp(secname, ".modinfo") == 0) {
496 if (nobits)
497 fatal("%s has NOBITS .modinfo\n", filename);
498 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
499 info->modinfo_len = sechdrs[i].sh_size;
500 } else if (strcmp(secname, "__ksymtab") == 0)
501 info->export_sec = i;
502 else if (strcmp(secname, "__ksymtab_unused") == 0)
503 info->export_unused_sec = i;
504 else if (strcmp(secname, "__ksymtab_gpl") == 0)
505 info->export_gpl_sec = i;
506 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
507 info->export_unused_gpl_sec = i;
508 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
509 info->export_gpl_future_sec = i;
510
511 if (sechdrs[i].sh_type == SHT_SYMTAB) {
512 unsigned int sh_link_idx;
513 symtab_idx = i;
514 info->symtab_start = (void *)hdr +
515 sechdrs[i].sh_offset;
516 info->symtab_stop = (void *)hdr +
517 sechdrs[i].sh_offset + sechdrs[i].sh_size;
518 sh_link_idx = sechdrs[i].sh_link;
519 info->strtab = (void *)hdr +
520 sechdrs[sh_link_idx].sh_offset;
521 }
522
523 /* 32bit section no. table? ("more than 64k sections") */
524 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
525 symtab_shndx_idx = i;
526 info->symtab_shndx_start = (void *)hdr +
527 sechdrs[i].sh_offset;
528 info->symtab_shndx_stop = (void *)hdr +
529 sechdrs[i].sh_offset + sechdrs[i].sh_size;
530 }
531 }
532 if (!info->symtab_start)
533 fatal("%s has no symtab?\n", filename);
534
535 /* Fix endianness in symbols */
536 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
537 sym->st_shndx = TO_NATIVE(sym->st_shndx);
538 sym->st_name = TO_NATIVE(sym->st_name);
539 sym->st_value = TO_NATIVE(sym->st_value);
540 sym->st_size = TO_NATIVE(sym->st_size);
541 }
542
543 if (symtab_shndx_idx != ~0U) {
544 Elf32_Word *p;
545 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
546 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
547 filename, sechdrs[symtab_shndx_idx].sh_link,
548 symtab_idx);
549 /* Fix endianness */
550 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
551 p++)
552 *p = TO_NATIVE(*p);
553 }
554
555 return 1;
556 }
557
558 static void parse_elf_finish(struct elf_info *info)
559 {
560 release_file(info->hdr, info->size);
561 }
562
563 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
564 {
565 /* ignore __this_module, it will be resolved shortly */
566 if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
567 return 1;
568 /* ignore global offset table */
569 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
570 return 1;
571 if (info->hdr->e_machine == EM_PPC)
572 /* Special register function linked on all modules during final link of .ko */
573 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
574 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
575 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
576 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
577 return 1;
578 if (info->hdr->e_machine == EM_PPC64)
579 /* Special register function linked on all modules during final link of .ko */
580 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
581 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
582 return 1;
583 /* Do not ignore this symbol */
584 return 0;
585 }
586
587 #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
588 #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
589
590 static void handle_modversions(struct module *mod, struct elf_info *info,
591 Elf_Sym *sym, const char *symname)
592 {
593 unsigned int crc;
594 enum export export;
595
596 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
597 strncmp(symname, "__ksymtab", 9) == 0)
598 export = export_from_secname(info, get_secindex(info, sym));
599 else
600 export = export_from_sec(info, get_secindex(info, sym));
601
602 switch (sym->st_shndx) {
603 case SHN_COMMON:
604 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
605 break;
606 case SHN_ABS:
607 /* CRC'd symbol */
608 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
609 crc = (unsigned int) sym->st_value;
610 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
611 export);
612 }
613 break;
614 case SHN_UNDEF:
615 /* undefined symbol */
616 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
617 ELF_ST_BIND(sym->st_info) != STB_WEAK)
618 break;
619 if (ignore_undef_symbol(info, symname))
620 break;
621 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
622 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
623 /* add compatibility with older glibc */
624 #ifndef STT_SPARC_REGISTER
625 #define STT_SPARC_REGISTER STT_REGISTER
626 #endif
627 if (info->hdr->e_machine == EM_SPARC ||
628 info->hdr->e_machine == EM_SPARCV9) {
629 /* Ignore register directives. */
630 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
631 break;
632 if (symname[0] == '.') {
633 char *munged = strdup(symname);
634 munged[0] = '_';
635 munged[1] = toupper(munged[1]);
636 symname = munged;
637 }
638 }
639 #endif
640
641 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
642 if (symname[0] != '_')
643 break;
644 else
645 symname++;
646 #endif
647 mod->unres = alloc_symbol(symname,
648 ELF_ST_BIND(sym->st_info) == STB_WEAK,
649 mod->unres);
650 break;
651 default:
652 /* All exported symbols */
653 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
654 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
655 export);
656 }
657 if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
658 mod->has_init = 1;
659 if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
660 mod->has_cleanup = 1;
661 break;
662 }
663 }
664
665 /**
666 * Parse tag=value strings from .modinfo section
667 **/
668 static char *next_string(char *string, unsigned long *secsize)
669 {
670 /* Skip non-zero chars */
671 while (string[0]) {
672 string++;
673 if ((*secsize)-- <= 1)
674 return NULL;
675 }
676
677 /* Skip any zero padding. */
678 while (!string[0]) {
679 string++;
680 if ((*secsize)-- <= 1)
681 return NULL;
682 }
683 return string;
684 }
685
686 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
687 const char *tag, char *info)
688 {
689 char *p;
690 unsigned int taglen = strlen(tag);
691 unsigned long size = modinfo_len;
692
693 if (info) {
694 size -= info - (char *)modinfo;
695 modinfo = next_string(info, &size);
696 }
697
698 for (p = modinfo; p; p = next_string(p, &size)) {
699 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
700 return p + taglen + 1;
701 }
702 return NULL;
703 }
704
705 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
706 const char *tag)
707
708 {
709 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
710 }
711
712 /**
713 * Test if string s ends in string sub
714 * return 0 if match
715 **/
716 static int strrcmp(const char *s, const char *sub)
717 {
718 int slen, sublen;
719
720 if (!s || !sub)
721 return 1;
722
723 slen = strlen(s);
724 sublen = strlen(sub);
725
726 if ((slen == 0) || (sublen == 0))
727 return 1;
728
729 if (sublen > slen)
730 return 1;
731
732 return memcmp(s + slen - sublen, sub, sublen);
733 }
734
735 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
736 {
737 if (sym)
738 return elf->strtab + sym->st_name;
739 else
740 return "(unknown)";
741 }
742
743 static const char *sec_name(struct elf_info *elf, int secindex)
744 {
745 Elf_Shdr *sechdrs = elf->sechdrs;
746 return (void *)elf->hdr +
747 elf->sechdrs[elf->secindex_strings].sh_offset +
748 sechdrs[secindex].sh_name;
749 }
750
751 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
752 {
753 return (void *)elf->hdr +
754 elf->sechdrs[elf->secindex_strings].sh_offset +
755 sechdr->sh_name;
756 }
757
758 /* if sym is empty or point to a string
759 * like ".[0-9]+" then return 1.
760 * This is the optional prefix added by ld to some sections
761 */
762 static int number_prefix(const char *sym)
763 {
764 if (*sym++ == '\0')
765 return 1;
766 if (*sym != '.')
767 return 0;
768 do {
769 char c = *sym++;
770 if (c < '0' || c > '9')
771 return 0;
772 } while (*sym);
773 return 1;
774 }
775
776 /* The pattern is an array of simple patterns.
777 * "foo" will match an exact string equal to "foo"
778 * "*foo" will match a string that ends with "foo"
779 * "foo*" will match a string that begins with "foo"
780 * "foo$" will match a string equal to "foo" or "foo.1"
781 * where the '1' can be any number including several digits.
782 * The $ syntax is for sections where ld append a dot number
783 * to make section name unique.
784 */
785 static int match(const char *sym, const char * const pat[])
786 {
787 const char *p;
788 while (*pat) {
789 p = *pat++;
790 const char *endp = p + strlen(p) - 1;
791
792 /* "*foo" */
793 if (*p == '*') {
794 if (strrcmp(sym, p + 1) == 0)
795 return 1;
796 }
797 /* "foo*" */
798 else if (*endp == '*') {
799 if (strncmp(sym, p, strlen(p) - 1) == 0)
800 return 1;
801 }
802 /* "foo$" */
803 else if (*endp == '$') {
804 if (strncmp(sym, p, strlen(p) - 1) == 0) {
805 if (number_prefix(sym + strlen(p) - 1))
806 return 1;
807 }
808 }
809 /* no wildcards */
810 else {
811 if (strcmp(p, sym) == 0)
812 return 1;
813 }
814 }
815 /* no match */
816 return 0;
817 }
818
819 /* sections that we do not want to do full section mismatch check on */
820 static const char *section_white_list[] =
821 {
822 ".comment*",
823 ".debug*",
824 ".zdebug*", /* Compressed debug sections. */
825 ".GCC-command-line", /* mn10300 */
826 ".GCC.command.line", /* record-gcc-switches, non mn10300 */
827 ".mdebug*", /* alpha, score, mips etc. */
828 ".pdr", /* alpha, score, mips etc. */
829 ".stab*",
830 ".note*",
831 ".got*",
832 ".toc*",
833 ".xt.prop", /* xtensa */
834 ".xt.lit", /* xtensa */
835 ".arcextmap*", /* arc */
836 ".gnu.linkonce.arcext*", /* arc : modules */
837 NULL
838 };
839
840 /*
841 * This is used to find sections missing the SHF_ALLOC flag.
842 * The cause of this is often a section specified in assembler
843 * without "ax" / "aw".
844 */
845 static void check_section(const char *modname, struct elf_info *elf,
846 Elf_Shdr *sechdr)
847 {
848 const char *sec = sech_name(elf, sechdr);
849
850 if (sechdr->sh_type == SHT_PROGBITS &&
851 !(sechdr->sh_flags & SHF_ALLOC) &&
852 !match(sec, section_white_list)) {
853 warn("%s (%s): unexpected non-allocatable section.\n"
854 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
855 "Note that for example <linux/init.h> contains\n"
856 "section definitions for use in .S files.\n\n",
857 modname, sec);
858 }
859 }
860
861
862
863 #define ALL_INIT_DATA_SECTIONS \
864 ".init.setup$", ".init.rodata$", ".meminit.rodata$", \
865 ".init.data$", ".meminit.data$"
866 #define ALL_EXIT_DATA_SECTIONS \
867 ".exit.data$", ".memexit.data$"
868
869 #define ALL_INIT_TEXT_SECTIONS \
870 ".init.text$", ".meminit.text$"
871 #define ALL_EXIT_TEXT_SECTIONS \
872 ".exit.text$", ".memexit.text$"
873
874 #define ALL_PCI_INIT_SECTIONS \
875 ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
876 ".pci_fixup_enable$", ".pci_fixup_resume$", \
877 ".pci_fixup_resume_early$", ".pci_fixup_suspend$"
878
879 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
880 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
881
882 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
883 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
884
885 #define DATA_SECTIONS ".data$", ".data.rel$"
886 #define TEXT_SECTIONS ".text$", ".text.unlikely$"
887
888 #define INIT_SECTIONS ".init.*"
889 #define MEM_INIT_SECTIONS ".meminit.*"
890
891 #define EXIT_SECTIONS ".exit.*"
892 #define MEM_EXIT_SECTIONS ".memexit.*"
893
894 /* init data sections */
895 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
896
897 /* all init sections */
898 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
899
900 /* All init and exit sections (code + data) */
901 static const char *init_exit_sections[] =
902 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
903
904 /* data section */
905 static const char *data_sections[] = { DATA_SECTIONS, NULL };
906
907
908 /* symbols in .data that may refer to init/exit sections */
909 #define DEFAULT_SYMBOL_WHITE_LIST \
910 "*driver", \
911 "*_template", /* scsi uses *_template a lot */ \
912 "*_timer", /* arm uses ops structures named _timer a lot */ \
913 "*_sht", /* scsi also used *_sht to some extent */ \
914 "*_ops", \
915 "*_probe", \
916 "*_probe_one", \
917 "*_console"
918
919 static const char *head_sections[] = { ".head.text*", NULL };
920 static const char *linker_symbols[] =
921 { "__init_begin", "_sinittext", "_einittext", NULL };
922
923 enum mismatch {
924 TEXT_TO_ANY_INIT,
925 DATA_TO_ANY_INIT,
926 TEXT_TO_ANY_EXIT,
927 DATA_TO_ANY_EXIT,
928 XXXINIT_TO_SOME_INIT,
929 XXXEXIT_TO_SOME_EXIT,
930 ANY_INIT_TO_ANY_EXIT,
931 ANY_EXIT_TO_ANY_INIT,
932 EXPORT_TO_INIT_EXIT,
933 };
934
935 struct sectioncheck {
936 const char *fromsec[20];
937 const char *tosec[20];
938 enum mismatch mismatch;
939 const char *symbol_white_list[20];
940 };
941
942 const struct sectioncheck sectioncheck[] = {
943 /* Do not reference init/exit code/data from
944 * normal code and data
945 */
946 {
947 .fromsec = { TEXT_SECTIONS, NULL },
948 .tosec = { ALL_INIT_SECTIONS, NULL },
949 .mismatch = TEXT_TO_ANY_INIT,
950 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
951 },
952 {
953 .fromsec = { DATA_SECTIONS, NULL },
954 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
955 .mismatch = DATA_TO_ANY_INIT,
956 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
957 },
958 {
959 .fromsec = { DATA_SECTIONS, NULL },
960 .tosec = { INIT_SECTIONS, NULL },
961 .mismatch = DATA_TO_ANY_INIT,
962 .symbol_white_list = {
963 "*_template", "*_timer", "*_sht", "*_ops",
964 "*_probe", "*_probe_one", "*_console", NULL
965 },
966 },
967 {
968 .fromsec = { TEXT_SECTIONS, NULL },
969 .tosec = { ALL_EXIT_SECTIONS, NULL },
970 .mismatch = TEXT_TO_ANY_EXIT,
971 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
972 },
973 {
974 .fromsec = { DATA_SECTIONS, NULL },
975 .tosec = { ALL_EXIT_SECTIONS, NULL },
976 .mismatch = DATA_TO_ANY_EXIT,
977 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
978 },
979 /* Do not reference init code/data from meminit code/data */
980 {
981 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
982 .tosec = { INIT_SECTIONS, NULL },
983 .mismatch = XXXINIT_TO_SOME_INIT,
984 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
985 },
986 /* Do not reference exit code/data from memexit code/data */
987 {
988 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
989 .tosec = { EXIT_SECTIONS, NULL },
990 .mismatch = XXXEXIT_TO_SOME_EXIT,
991 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
992 },
993 /* Do not use exit code/data from init code */
994 {
995 .fromsec = { ALL_INIT_SECTIONS, NULL },
996 .tosec = { ALL_EXIT_SECTIONS, NULL },
997 .mismatch = ANY_INIT_TO_ANY_EXIT,
998 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
999 },
1000 /* Do not use init code/data from exit code */
1001 {
1002 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1003 .tosec = { ALL_INIT_SECTIONS, NULL },
1004 .mismatch = ANY_EXIT_TO_ANY_INIT,
1005 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1006 },
1007 {
1008 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1009 .tosec = { INIT_SECTIONS, NULL },
1010 .mismatch = ANY_INIT_TO_ANY_EXIT,
1011 .symbol_white_list = { NULL },
1012 },
1013 /* Do not export init/exit functions or data */
1014 {
1015 .fromsec = { "__ksymtab*", NULL },
1016 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1017 .mismatch = EXPORT_TO_INIT_EXIT,
1018 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1019 }
1020 };
1021
1022 static const struct sectioncheck *section_mismatch(
1023 const char *fromsec, const char *tosec)
1024 {
1025 int i;
1026 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1027 const struct sectioncheck *check = &sectioncheck[0];
1028
1029 for (i = 0; i < elems; i++) {
1030 if (match(fromsec, check->fromsec) &&
1031 match(tosec, check->tosec))
1032 return check;
1033 check++;
1034 }
1035 return NULL;
1036 }
1037
1038 /**
1039 * Whitelist to allow certain references to pass with no warning.
1040 *
1041 * Pattern 1:
1042 * If a module parameter is declared __initdata and permissions=0
1043 * then this is legal despite the warning generated.
1044 * We cannot see value of permissions here, so just ignore
1045 * this pattern.
1046 * The pattern is identified by:
1047 * tosec = .init.data
1048 * fromsec = .data*
1049 * atsym =__param*
1050 *
1051 * Pattern 1a:
1052 * module_param_call() ops can refer to __init set function if permissions=0
1053 * The pattern is identified by:
1054 * tosec = .init.text
1055 * fromsec = .data*
1056 * atsym = __param_ops_*
1057 *
1058 * Pattern 2:
1059 * Many drivers utilise a *driver container with references to
1060 * add, remove, probe functions etc.
1061 * the pattern is identified by:
1062 * tosec = init or exit section
1063 * fromsec = data section
1064 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1065 * *probe_one, *_console, *_timer
1066 *
1067 * Pattern 3:
1068 * Whitelist all references from .head.text to any init section
1069 *
1070 * Pattern 4:
1071 * Some symbols belong to init section but still it is ok to reference
1072 * these from non-init sections as these symbols don't have any memory
1073 * allocated for them and symbol address and value are same. So even
1074 * if init section is freed, its ok to reference those symbols.
1075 * For ex. symbols marking the init section boundaries.
1076 * This pattern is identified by
1077 * refsymname = __init_begin, _sinittext, _einittext
1078 *
1079 **/
1080 static int secref_whitelist(const struct sectioncheck *mismatch,
1081 const char *fromsec, const char *fromsym,
1082 const char *tosec, const char *tosym)
1083 {
1084 /* Check for pattern 1 */
1085 if (match(tosec, init_data_sections) &&
1086 match(fromsec, data_sections) &&
1087 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1088 return 0;
1089
1090 /* Check for pattern 1a */
1091 if (strcmp(tosec, ".init.text") == 0 &&
1092 match(fromsec, data_sections) &&
1093 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1094 return 0;
1095
1096 /* Check for pattern 2 */
1097 if (match(tosec, init_exit_sections) &&
1098 match(fromsec, data_sections) &&
1099 match(fromsym, mismatch->symbol_white_list))
1100 return 0;
1101
1102 /* Check for pattern 3 */
1103 if (match(fromsec, head_sections) &&
1104 match(tosec, init_sections))
1105 return 0;
1106
1107 /* Check for pattern 4 */
1108 if (match(tosym, linker_symbols))
1109 return 0;
1110
1111 return 1;
1112 }
1113
1114 /**
1115 * Find symbol based on relocation record info.
1116 * In some cases the symbol supplied is a valid symbol so
1117 * return refsym. If st_name != 0 we assume this is a valid symbol.
1118 * In other cases the symbol needs to be looked up in the symbol table
1119 * based on section and address.
1120 * **/
1121 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1122 Elf_Sym *relsym)
1123 {
1124 Elf_Sym *sym;
1125 Elf_Sym *near = NULL;
1126 Elf64_Sword distance = 20;
1127 Elf64_Sword d;
1128 unsigned int relsym_secindex;
1129
1130 if (relsym->st_name != 0)
1131 return relsym;
1132
1133 relsym_secindex = get_secindex(elf, relsym);
1134 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1135 if (get_secindex(elf, sym) != relsym_secindex)
1136 continue;
1137 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1138 continue;
1139 if (sym->st_value == addr)
1140 return sym;
1141 /* Find a symbol nearby - addr are maybe negative */
1142 d = sym->st_value - addr;
1143 if (d < 0)
1144 d = addr - sym->st_value;
1145 if (d < distance) {
1146 distance = d;
1147 near = sym;
1148 }
1149 }
1150 /* We need a close match */
1151 if (distance < 20)
1152 return near;
1153 else
1154 return NULL;
1155 }
1156
1157 static inline int is_arm_mapping_symbol(const char *str)
1158 {
1159 return str[0] == '$' && strchr("atd", str[1])
1160 && (str[2] == '\0' || str[2] == '.');
1161 }
1162
1163 /*
1164 * If there's no name there, ignore it; likewise, ignore it if it's
1165 * one of the magic symbols emitted used by current ARM tools.
1166 *
1167 * Otherwise if find_symbols_between() returns those symbols, they'll
1168 * fail the whitelist tests and cause lots of false alarms ... fixable
1169 * only by merging __exit and __init sections into __text, bloating
1170 * the kernel (which is especially evil on embedded platforms).
1171 */
1172 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1173 {
1174 const char *name = elf->strtab + sym->st_name;
1175
1176 if (!name || !strlen(name))
1177 return 0;
1178 return !is_arm_mapping_symbol(name);
1179 }
1180
1181 /*
1182 * Find symbols before or equal addr and after addr - in the section sec.
1183 * If we find two symbols with equal offset prefer one with a valid name.
1184 * The ELF format may have a better way to detect what type of symbol
1185 * it is, but this works for now.
1186 **/
1187 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1188 const char *sec)
1189 {
1190 Elf_Sym *sym;
1191 Elf_Sym *near = NULL;
1192 Elf_Addr distance = ~0;
1193
1194 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1195 const char *symsec;
1196
1197 if (is_shndx_special(sym->st_shndx))
1198 continue;
1199 symsec = sec_name(elf, get_secindex(elf, sym));
1200 if (strcmp(symsec, sec) != 0)
1201 continue;
1202 if (!is_valid_name(elf, sym))
1203 continue;
1204 if (sym->st_value <= addr) {
1205 if ((addr - sym->st_value) < distance) {
1206 distance = addr - sym->st_value;
1207 near = sym;
1208 } else if ((addr - sym->st_value) == distance) {
1209 near = sym;
1210 }
1211 }
1212 }
1213 return near;
1214 }
1215
1216 /*
1217 * Convert a section name to the function/data attribute
1218 * .init.text => __init
1219 * .memexitconst => __memconst
1220 * etc.
1221 *
1222 * The memory of returned value has been allocated on a heap. The user of this
1223 * method should free it after usage.
1224 */
1225 static char *sec2annotation(const char *s)
1226 {
1227 if (match(s, init_exit_sections)) {
1228 char *p = malloc(20);
1229 char *r = p;
1230
1231 *p++ = '_';
1232 *p++ = '_';
1233 if (*s == '.')
1234 s++;
1235 while (*s && *s != '.')
1236 *p++ = *s++;
1237 *p = '\0';
1238 if (*s == '.')
1239 s++;
1240 if (strstr(s, "rodata") != NULL)
1241 strcat(p, "const ");
1242 else if (strstr(s, "data") != NULL)
1243 strcat(p, "data ");
1244 else
1245 strcat(p, " ");
1246 return r;
1247 } else {
1248 return strdup("");
1249 }
1250 }
1251
1252 static int is_function(Elf_Sym *sym)
1253 {
1254 if (sym)
1255 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1256 else
1257 return -1;
1258 }
1259
1260 static void print_section_list(const char * const list[20])
1261 {
1262 const char *const *s = list;
1263
1264 while (*s) {
1265 fprintf(stderr, "%s", *s);
1266 s++;
1267 if (*s)
1268 fprintf(stderr, ", ");
1269 }
1270 fprintf(stderr, "\n");
1271 }
1272
1273 /*
1274 * Print a warning about a section mismatch.
1275 * Try to find symbols near it so user can find it.
1276 * Check whitelist before warning - it may be a false positive.
1277 */
1278 static void report_sec_mismatch(const char *modname,
1279 const struct sectioncheck *mismatch,
1280 const char *fromsec,
1281 unsigned long long fromaddr,
1282 const char *fromsym,
1283 int from_is_func,
1284 const char *tosec, const char *tosym,
1285 int to_is_func)
1286 {
1287 const char *from, *from_p;
1288 const char *to, *to_p;
1289 char *prl_from;
1290 char *prl_to;
1291
1292 switch (from_is_func) {
1293 case 0: from = "variable"; from_p = ""; break;
1294 case 1: from = "function"; from_p = "()"; break;
1295 default: from = "(unknown reference)"; from_p = ""; break;
1296 }
1297 switch (to_is_func) {
1298 case 0: to = "variable"; to_p = ""; break;
1299 case 1: to = "function"; to_p = "()"; break;
1300 default: to = "(unknown reference)"; to_p = ""; break;
1301 }
1302
1303 sec_mismatch_count++;
1304 if (!sec_mismatch_verbose)
1305 return;
1306
1307 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1308 "to the %s %s:%s%s\n",
1309 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1310 tosym, to_p);
1311
1312 switch (mismatch->mismatch) {
1313 case TEXT_TO_ANY_INIT:
1314 prl_from = sec2annotation(fromsec);
1315 prl_to = sec2annotation(tosec);
1316 fprintf(stderr,
1317 "The function %s%s() references\n"
1318 "the %s %s%s%s.\n"
1319 "This is often because %s lacks a %s\n"
1320 "annotation or the annotation of %s is wrong.\n",
1321 prl_from, fromsym,
1322 to, prl_to, tosym, to_p,
1323 fromsym, prl_to, tosym);
1324 free(prl_from);
1325 free(prl_to);
1326 break;
1327 case DATA_TO_ANY_INIT: {
1328 prl_to = sec2annotation(tosec);
1329 fprintf(stderr,
1330 "The variable %s references\n"
1331 "the %s %s%s%s\n"
1332 "If the reference is valid then annotate the\n"
1333 "variable with __init* or __refdata (see linux/init.h) "
1334 "or name the variable:\n",
1335 fromsym, to, prl_to, tosym, to_p);
1336 print_section_list(mismatch->symbol_white_list);
1337 free(prl_to);
1338 break;
1339 }
1340 case TEXT_TO_ANY_EXIT:
1341 prl_to = sec2annotation(tosec);
1342 fprintf(stderr,
1343 "The function %s() references a %s in an exit section.\n"
1344 "Often the %s %s%s has valid usage outside the exit section\n"
1345 "and the fix is to remove the %sannotation of %s.\n",
1346 fromsym, to, to, tosym, to_p, prl_to, tosym);
1347 free(prl_to);
1348 break;
1349 case DATA_TO_ANY_EXIT: {
1350 prl_to = sec2annotation(tosec);
1351 fprintf(stderr,
1352 "The variable %s references\n"
1353 "the %s %s%s%s\n"
1354 "If the reference is valid then annotate the\n"
1355 "variable with __exit* (see linux/init.h) or "
1356 "name the variable:\n",
1357 fromsym, to, prl_to, tosym, to_p);
1358 print_section_list(mismatch->symbol_white_list);
1359 free(prl_to);
1360 break;
1361 }
1362 case XXXINIT_TO_SOME_INIT:
1363 case XXXEXIT_TO_SOME_EXIT:
1364 prl_from = sec2annotation(fromsec);
1365 prl_to = sec2annotation(tosec);
1366 fprintf(stderr,
1367 "The %s %s%s%s references\n"
1368 "a %s %s%s%s.\n"
1369 "If %s is only used by %s then\n"
1370 "annotate %s with a matching annotation.\n",
1371 from, prl_from, fromsym, from_p,
1372 to, prl_to, tosym, to_p,
1373 tosym, fromsym, tosym);
1374 free(prl_from);
1375 free(prl_to);
1376 break;
1377 case ANY_INIT_TO_ANY_EXIT:
1378 prl_from = sec2annotation(fromsec);
1379 prl_to = sec2annotation(tosec);
1380 fprintf(stderr,
1381 "The %s %s%s%s references\n"
1382 "a %s %s%s%s.\n"
1383 "This is often seen when error handling "
1384 "in the init function\n"
1385 "uses functionality in the exit path.\n"
1386 "The fix is often to remove the %sannotation of\n"
1387 "%s%s so it may be used outside an exit section.\n",
1388 from, prl_from, fromsym, from_p,
1389 to, prl_to, tosym, to_p,
1390 prl_to, tosym, to_p);
1391 free(prl_from);
1392 free(prl_to);
1393 break;
1394 case ANY_EXIT_TO_ANY_INIT:
1395 prl_from = sec2annotation(fromsec);
1396 prl_to = sec2annotation(tosec);
1397 fprintf(stderr,
1398 "The %s %s%s%s references\n"
1399 "a %s %s%s%s.\n"
1400 "This is often seen when error handling "
1401 "in the exit function\n"
1402 "uses functionality in the init path.\n"
1403 "The fix is often to remove the %sannotation of\n"
1404 "%s%s so it may be used outside an init section.\n",
1405 from, prl_from, fromsym, from_p,
1406 to, prl_to, tosym, to_p,
1407 prl_to, tosym, to_p);
1408 free(prl_from);
1409 free(prl_to);
1410 break;
1411 case EXPORT_TO_INIT_EXIT:
1412 prl_to = sec2annotation(tosec);
1413 fprintf(stderr,
1414 "The symbol %s is exported and annotated %s\n"
1415 "Fix this by removing the %sannotation of %s "
1416 "or drop the export.\n",
1417 tosym, prl_to, prl_to, tosym);
1418 free(prl_to);
1419 break;
1420 }
1421 fprintf(stderr, "\n");
1422 }
1423
1424 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1425 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1426 {
1427 const char *tosec;
1428 const struct sectioncheck *mismatch;
1429
1430 tosec = sec_name(elf, get_secindex(elf, sym));
1431 mismatch = section_mismatch(fromsec, tosec);
1432 if (mismatch) {
1433 Elf_Sym *to;
1434 Elf_Sym *from;
1435 const char *tosym;
1436 const char *fromsym;
1437
1438 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1439 fromsym = sym_name(elf, from);
1440 to = find_elf_symbol(elf, r->r_addend, sym);
1441 tosym = sym_name(elf, to);
1442
1443 /* check whitelist - we may ignore it */
1444 if (secref_whitelist(mismatch,
1445 fromsec, fromsym, tosec, tosym)) {
1446 report_sec_mismatch(modname, mismatch,
1447 fromsec, r->r_offset, fromsym,
1448 is_function(from), tosec, tosym,
1449 is_function(to));
1450 }
1451 }
1452 }
1453
1454 static unsigned int *reloc_location(struct elf_info *elf,
1455 Elf_Shdr *sechdr, Elf_Rela *r)
1456 {
1457 Elf_Shdr *sechdrs = elf->sechdrs;
1458 int section = sechdr->sh_info;
1459
1460 return (void *)elf->hdr + sechdrs[section].sh_offset +
1461 r->r_offset;
1462 }
1463
1464 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1465 {
1466 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1467 unsigned int *location = reloc_location(elf, sechdr, r);
1468
1469 switch (r_typ) {
1470 case R_386_32:
1471 r->r_addend = TO_NATIVE(*location);
1472 break;
1473 case R_386_PC32:
1474 r->r_addend = TO_NATIVE(*location) + 4;
1475 /* For CONFIG_RELOCATABLE=y */
1476 if (elf->hdr->e_type == ET_EXEC)
1477 r->r_addend += r->r_offset;
1478 break;
1479 }
1480 return 0;
1481 }
1482
1483 #ifndef R_ARM_CALL
1484 #define R_ARM_CALL 28
1485 #endif
1486 #ifndef R_ARM_JUMP24
1487 #define R_ARM_JUMP24 29
1488 #endif
1489
1490 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1491 {
1492 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1493
1494 switch (r_typ) {
1495 case R_ARM_ABS32:
1496 /* From ARM ABI: (S + A) | T */
1497 r->r_addend = (int)(long)
1498 (elf->symtab_start + ELF_R_SYM(r->r_info));
1499 break;
1500 case R_ARM_PC24:
1501 case R_ARM_CALL:
1502 case R_ARM_JUMP24:
1503 /* From ARM ABI: ((S + A) | T) - P */
1504 r->r_addend = (int)(long)(elf->hdr +
1505 sechdr->sh_offset +
1506 (r->r_offset - sechdr->sh_addr));
1507 break;
1508 default:
1509 return 1;
1510 }
1511 return 0;
1512 }
1513
1514 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1515 {
1516 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1517 unsigned int *location = reloc_location(elf, sechdr, r);
1518 unsigned int inst;
1519
1520 if (r_typ == R_MIPS_HI16)
1521 return 1; /* skip this */
1522 inst = TO_NATIVE(*location);
1523 switch (r_typ) {
1524 case R_MIPS_LO16:
1525 r->r_addend = inst & 0xffff;
1526 break;
1527 case R_MIPS_26:
1528 r->r_addend = (inst & 0x03ffffff) << 2;
1529 break;
1530 case R_MIPS_32:
1531 r->r_addend = inst;
1532 break;
1533 }
1534 return 0;
1535 }
1536
1537 static void section_rela(const char *modname, struct elf_info *elf,
1538 Elf_Shdr *sechdr)
1539 {
1540 Elf_Sym *sym;
1541 Elf_Rela *rela;
1542 Elf_Rela r;
1543 unsigned int r_sym;
1544 const char *fromsec;
1545
1546 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1547 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1548
1549 fromsec = sech_name(elf, sechdr);
1550 fromsec += strlen(".rela");
1551 /* if from section (name) is know good then skip it */
1552 if (match(fromsec, section_white_list))
1553 return;
1554
1555 for (rela = start; rela < stop; rela++) {
1556 r.r_offset = TO_NATIVE(rela->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(rela->r_info);
1561 r_sym = TO_NATIVE(r_sym);
1562 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1563 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1564 } else {
1565 r.r_info = TO_NATIVE(rela->r_info);
1566 r_sym = ELF_R_SYM(r.r_info);
1567 }
1568 #else
1569 r.r_info = TO_NATIVE(rela->r_info);
1570 r_sym = ELF_R_SYM(r.r_info);
1571 #endif
1572 r.r_addend = TO_NATIVE(rela->r_addend);
1573 sym = elf->symtab_start + r_sym;
1574 /* Skip special sections */
1575 if (is_shndx_special(sym->st_shndx))
1576 continue;
1577 check_section_mismatch(modname, elf, &r, sym, fromsec);
1578 }
1579 }
1580
1581 static void section_rel(const char *modname, struct elf_info *elf,
1582 Elf_Shdr *sechdr)
1583 {
1584 Elf_Sym *sym;
1585 Elf_Rel *rel;
1586 Elf_Rela r;
1587 unsigned int r_sym;
1588 const char *fromsec;
1589
1590 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1591 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1592
1593 fromsec = sech_name(elf, sechdr);
1594 fromsec += strlen(".rel");
1595 /* if from section (name) is know good then skip it */
1596 if (match(fromsec, section_white_list))
1597 return;
1598
1599 for (rel = start; rel < stop; rel++) {
1600 r.r_offset = TO_NATIVE(rel->r_offset);
1601 #if KERNEL_ELFCLASS == ELFCLASS64
1602 if (elf->hdr->e_machine == EM_MIPS) {
1603 unsigned int r_typ;
1604 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1605 r_sym = TO_NATIVE(r_sym);
1606 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1607 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1608 } else {
1609 r.r_info = TO_NATIVE(rel->r_info);
1610 r_sym = ELF_R_SYM(r.r_info);
1611 }
1612 #else
1613 r.r_info = TO_NATIVE(rel->r_info);
1614 r_sym = ELF_R_SYM(r.r_info);
1615 #endif
1616 r.r_addend = 0;
1617 switch (elf->hdr->e_machine) {
1618 case EM_386:
1619 if (addend_386_rel(elf, sechdr, &r))
1620 continue;
1621 break;
1622 case EM_ARM:
1623 if (addend_arm_rel(elf, sechdr, &r))
1624 continue;
1625 break;
1626 case EM_MIPS:
1627 if (addend_mips_rel(elf, sechdr, &r))
1628 continue;
1629 break;
1630 }
1631 sym = elf->symtab_start + r_sym;
1632 /* Skip special sections */
1633 if (is_shndx_special(sym->st_shndx))
1634 continue;
1635 check_section_mismatch(modname, elf, &r, sym, fromsec);
1636 }
1637 }
1638
1639 /**
1640 * A module includes a number of sections that are discarded
1641 * either when loaded or when used as built-in.
1642 * For loaded modules all functions marked __init and all data
1643 * marked __initdata will be discarded when the module has been initialized.
1644 * Likewise for modules used built-in the sections marked __exit
1645 * are discarded because __exit marked function are supposed to be called
1646 * only when a module is unloaded which never happens for built-in modules.
1647 * The check_sec_ref() function traverses all relocation records
1648 * to find all references to a section that reference a section that will
1649 * be discarded and warns about it.
1650 **/
1651 static void check_sec_ref(struct module *mod, const char *modname,
1652 struct elf_info *elf)
1653 {
1654 int i;
1655 Elf_Shdr *sechdrs = elf->sechdrs;
1656
1657 /* Walk through all sections */
1658 for (i = 0; i < elf->num_sections; i++) {
1659 check_section(modname, elf, &elf->sechdrs[i]);
1660 /* We want to process only relocation sections and not .init */
1661 if (sechdrs[i].sh_type == SHT_RELA)
1662 section_rela(modname, elf, &elf->sechdrs[i]);
1663 else if (sechdrs[i].sh_type == SHT_REL)
1664 section_rel(modname, elf, &elf->sechdrs[i]);
1665 }
1666 }
1667
1668 static void read_symbols(char *modname)
1669 {
1670 const char *symname;
1671 char *version;
1672 char *license;
1673 struct module *mod;
1674 struct elf_info info = { };
1675 Elf_Sym *sym;
1676
1677 if (!parse_elf(&info, modname))
1678 return;
1679
1680 mod = new_module(modname);
1681
1682 /* When there's no vmlinux, don't print warnings about
1683 * unresolved symbols (since there'll be too many ;) */
1684 if (is_vmlinux(modname)) {
1685 have_vmlinux = 1;
1686 mod->skip = 1;
1687 }
1688
1689 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1690 if (info.modinfo && !license && !is_vmlinux(modname))
1691 warn("modpost: missing MODULE_LICENSE() in %s\n"
1692 "see include/linux/module.h for "
1693 "more information\n", modname);
1694 while (license) {
1695 if (license_is_gpl_compatible(license))
1696 mod->gpl_compatible = 1;
1697 else {
1698 mod->gpl_compatible = 0;
1699 break;
1700 }
1701 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1702 "license", license);
1703 }
1704
1705 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1706 symname = info.strtab + sym->st_name;
1707
1708 handle_modversions(mod, &info, sym, symname);
1709 handle_moddevtable(mod, &info, sym, symname);
1710 }
1711 if (!is_vmlinux(modname) ||
1712 (is_vmlinux(modname) && vmlinux_section_warnings))
1713 check_sec_ref(mod, modname, &info);
1714
1715 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1716 if (version)
1717 maybe_frob_rcs_version(modname, version, info.modinfo,
1718 version - (char *)info.hdr);
1719 if (version || (all_versions && !is_vmlinux(modname)))
1720 get_src_version(modname, mod->srcversion,
1721 sizeof(mod->srcversion)-1);
1722
1723 parse_elf_finish(&info);
1724
1725 /* Our trick to get versioning for module struct etc. - it's
1726 * never passed as an argument to an exported function, so
1727 * the automatic versioning doesn't pick it up, but it's really
1728 * important anyhow */
1729 if (modversions)
1730 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1731 }
1732
1733 static void read_symbols_from_files(const char *filename)
1734 {
1735 FILE *in = stdin;
1736 char fname[PATH_MAX];
1737
1738 if (strcmp(filename, "-") != 0) {
1739 in = fopen(filename, "r");
1740 if (!in)
1741 fatal("Can't open filenames file %s: %m", filename);
1742 }
1743
1744 while (fgets(fname, PATH_MAX, in) != NULL) {
1745 if (strends(fname, "\n"))
1746 fname[strlen(fname)-1] = '\0';
1747 read_symbols(fname);
1748 }
1749
1750 if (in != stdin)
1751 fclose(in);
1752 }
1753
1754 #define SZ 500
1755
1756 /* We first write the generated file into memory using the
1757 * following helper, then compare to the file on disk and
1758 * only update the later if anything changed */
1759
1760 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1761 const char *fmt, ...)
1762 {
1763 char tmp[SZ];
1764 int len;
1765 va_list ap;
1766
1767 va_start(ap, fmt);
1768 len = vsnprintf(tmp, SZ, fmt, ap);
1769 buf_write(buf, tmp, len);
1770 va_end(ap);
1771 }
1772
1773 void buf_write(struct buffer *buf, const char *s, int len)
1774 {
1775 if (buf->size - buf->pos < len) {
1776 buf->size += len + SZ;
1777 buf->p = realloc(buf->p, buf->size);
1778 }
1779 strncpy(buf->p + buf->pos, s, len);
1780 buf->pos += len;
1781 }
1782
1783 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1784 {
1785 const char *e = is_vmlinux(m) ?"":".ko";
1786
1787 switch (exp) {
1788 case export_gpl:
1789 fatal("modpost: GPL-incompatible module %s%s "
1790 "uses GPL-only symbol '%s'\n", m, e, s);
1791 break;
1792 case export_unused_gpl:
1793 fatal("modpost: GPL-incompatible module %s%s "
1794 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1795 break;
1796 case export_gpl_future:
1797 warn("modpost: GPL-incompatible module %s%s "
1798 "uses future GPL-only symbol '%s'\n", m, e, s);
1799 break;
1800 case export_plain:
1801 case export_unused:
1802 case export_unknown:
1803 /* ignore */
1804 break;
1805 }
1806 }
1807
1808 static void check_for_unused(enum export exp, const char *m, const char *s)
1809 {
1810 const char *e = is_vmlinux(m) ?"":".ko";
1811
1812 switch (exp) {
1813 case export_unused:
1814 case export_unused_gpl:
1815 warn("modpost: module %s%s "
1816 "uses symbol '%s' marked UNUSED\n", m, e, s);
1817 break;
1818 default:
1819 /* ignore */
1820 break;
1821 }
1822 }
1823
1824 static void check_exports(struct module *mod)
1825 {
1826 struct symbol *s, *exp;
1827
1828 for (s = mod->unres; s; s = s->next) {
1829 const char *basename;
1830 exp = find_symbol(s->name);
1831 if (!exp || exp->module == mod)
1832 continue;
1833 basename = strrchr(mod->name, '/');
1834 if (basename)
1835 basename++;
1836 else
1837 basename = mod->name;
1838 if (!mod->gpl_compatible)
1839 check_for_gpl_usage(exp->export, basename, exp->name);
1840 check_for_unused(exp->export, basename, exp->name);
1841 }
1842 }
1843
1844 /**
1845 * Header for the generated file
1846 **/
1847 static void add_header(struct buffer *b, struct module *mod)
1848 {
1849 buf_printf(b, "#include <linux/module.h>\n");
1850 buf_printf(b, "#include <linux/vermagic.h>\n");
1851 buf_printf(b, "#include <linux/compiler.h>\n");
1852 buf_printf(b, "\n");
1853 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1854 buf_printf(b, "\n");
1855 buf_printf(b, "struct module __this_module\n");
1856 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1857 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
1858 if (mod->has_init)
1859 buf_printf(b, "\t.init = init_module,\n");
1860 if (mod->has_cleanup)
1861 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1862 "\t.exit = cleanup_module,\n"
1863 "#endif\n");
1864 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
1865 buf_printf(b, "};\n");
1866 }
1867
1868 static void add_intree_flag(struct buffer *b, int is_intree)
1869 {
1870 if (is_intree)
1871 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
1872 }
1873
1874 static void add_staging_flag(struct buffer *b, const char *name)
1875 {
1876 static const char *staging_dir = "drivers/staging";
1877
1878 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1879 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1880 }
1881
1882 /**
1883 * Record CRCs for unresolved symbols
1884 **/
1885 static int add_versions(struct buffer *b, struct module *mod)
1886 {
1887 struct symbol *s, *exp;
1888 int err = 0;
1889
1890 for (s = mod->unres; s; s = s->next) {
1891 exp = find_symbol(s->name);
1892 if (!exp || exp->module == mod) {
1893 if (have_vmlinux && !s->weak) {
1894 if (warn_unresolved) {
1895 warn("\"%s\" [%s.ko] undefined!\n",
1896 s->name, mod->name);
1897 } else {
1898 merror("\"%s\" [%s.ko] undefined!\n",
1899 s->name, mod->name);
1900 err = 1;
1901 }
1902 }
1903 continue;
1904 }
1905 s->module = exp->module;
1906 s->crc_valid = exp->crc_valid;
1907 s->crc = exp->crc;
1908 }
1909
1910 if (!modversions)
1911 return err;
1912
1913 buf_printf(b, "\n");
1914 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1915 buf_printf(b, "__used\n");
1916 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1917
1918 for (s = mod->unres; s; s = s->next) {
1919 if (!s->module)
1920 continue;
1921 if (!s->crc_valid) {
1922 warn("\"%s\" [%s.ko] has no CRC!\n",
1923 s->name, mod->name);
1924 continue;
1925 }
1926 buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
1927 s->crc, s->name);
1928 }
1929
1930 buf_printf(b, "};\n");
1931
1932 return err;
1933 }
1934
1935 static void add_depends(struct buffer *b, struct module *mod,
1936 struct module *modules)
1937 {
1938 struct symbol *s;
1939 struct module *m;
1940 int first = 1;
1941
1942 for (m = modules; m; m = m->next)
1943 m->seen = is_vmlinux(m->name);
1944
1945 buf_printf(b, "\n");
1946 buf_printf(b, "static const char __module_depends[]\n");
1947 buf_printf(b, "__used\n");
1948 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1949 buf_printf(b, "\"depends=");
1950 for (s = mod->unres; s; s = s->next) {
1951 const char *p;
1952 if (!s->module)
1953 continue;
1954
1955 if (s->module->seen)
1956 continue;
1957
1958 s->module->seen = 1;
1959 p = strrchr(s->module->name, '/');
1960 if (p)
1961 p++;
1962 else
1963 p = s->module->name;
1964 buf_printf(b, "%s%s", first ? "" : ",", p);
1965 first = 0;
1966 }
1967 buf_printf(b, "\";\n");
1968 }
1969
1970 static void add_srcversion(struct buffer *b, struct module *mod)
1971 {
1972 if (mod->srcversion[0]) {
1973 buf_printf(b, "\n");
1974 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1975 mod->srcversion);
1976 }
1977 }
1978
1979 static void write_if_changed(struct buffer *b, const char *fname)
1980 {
1981 char *tmp;
1982 FILE *file;
1983 struct stat st;
1984
1985 file = fopen(fname, "r");
1986 if (!file)
1987 goto write;
1988
1989 if (fstat(fileno(file), &st) < 0)
1990 goto close_write;
1991
1992 if (st.st_size != b->pos)
1993 goto close_write;
1994
1995 tmp = NOFAIL(malloc(b->pos));
1996 if (fread(tmp, 1, b->pos, file) != b->pos)
1997 goto free_write;
1998
1999 if (memcmp(tmp, b->p, b->pos) != 0)
2000 goto free_write;
2001
2002 free(tmp);
2003 fclose(file);
2004 return;
2005
2006 free_write:
2007 free(tmp);
2008 close_write:
2009 fclose(file);
2010 write:
2011 file = fopen(fname, "w");
2012 if (!file) {
2013 perror(fname);
2014 exit(1);
2015 }
2016 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2017 perror(fname);
2018 exit(1);
2019 }
2020 fclose(file);
2021 }
2022
2023 /* parse Module.symvers file. line format:
2024 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2025 **/
2026 static void read_dump(const char *fname, unsigned int kernel)
2027 {
2028 unsigned long size, pos = 0;
2029 void *file = grab_file(fname, &size);
2030 char *line;
2031
2032 if (!file)
2033 /* No symbol versions, silently ignore */
2034 return;
2035
2036 while ((line = get_next_line(&pos, file, size))) {
2037 char *symname, *modname, *d, *export, *end;
2038 unsigned int crc;
2039 struct module *mod;
2040 struct symbol *s;
2041
2042 if (!(symname = strchr(line, '\t')))
2043 goto fail;
2044 *symname++ = '\0';
2045 if (!(modname = strchr(symname, '\t')))
2046 goto fail;
2047 *modname++ = '\0';
2048 if ((export = strchr(modname, '\t')) != NULL)
2049 *export++ = '\0';
2050 if (export && ((end = strchr(export, '\t')) != NULL))
2051 *end = '\0';
2052 crc = strtoul(line, &d, 16);
2053 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2054 goto fail;
2055 mod = find_module(modname);
2056 if (!mod) {
2057 if (is_vmlinux(modname))
2058 have_vmlinux = 1;
2059 mod = new_module(modname);
2060 mod->skip = 1;
2061 }
2062 s = sym_add_exported(symname, mod, export_no(export));
2063 s->kernel = kernel;
2064 s->preloaded = 1;
2065 sym_update_crc(symname, mod, crc, export_no(export));
2066 }
2067 return;
2068 fail:
2069 fatal("parse error in symbol dump file\n");
2070 }
2071
2072 /* For normal builds always dump all symbols.
2073 * For external modules only dump symbols
2074 * that are not read from kernel Module.symvers.
2075 **/
2076 static int dump_sym(struct symbol *sym)
2077 {
2078 if (!external_module)
2079 return 1;
2080 if (sym->vmlinux || sym->kernel)
2081 return 0;
2082 return 1;
2083 }
2084
2085 static void write_dump(const char *fname)
2086 {
2087 struct buffer buf = { };
2088 struct symbol *symbol;
2089 int n;
2090
2091 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2092 symbol = symbolhash[n];
2093 while (symbol) {
2094 if (dump_sym(symbol))
2095 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2096 symbol->crc, symbol->name,
2097 symbol->module->name,
2098 export_str(symbol->export));
2099 symbol = symbol->next;
2100 }
2101 }
2102 write_if_changed(&buf, fname);
2103 }
2104
2105 struct ext_sym_list {
2106 struct ext_sym_list *next;
2107 const char *file;
2108 };
2109
2110 int main(int argc, char **argv)
2111 {
2112 struct module *mod;
2113 struct buffer buf = { };
2114 char *kernel_read = NULL, *module_read = NULL;
2115 char *dump_write = NULL, *files_source = NULL;
2116 int opt;
2117 int err;
2118 struct ext_sym_list *extsym_iter;
2119 struct ext_sym_list *extsym_start = NULL;
2120
2121 while ((opt = getopt(argc, argv, "i:I:e:msST:o:awM:K:")) != -1) {
2122 switch (opt) {
2123 case 'i':
2124 kernel_read = optarg;
2125 break;
2126 case 'I':
2127 module_read = optarg;
2128 external_module = 1;
2129 break;
2130 case 'e':
2131 external_module = 1;
2132 extsym_iter =
2133 NOFAIL(malloc(sizeof(*extsym_iter)));
2134 extsym_iter->next = extsym_start;
2135 extsym_iter->file = optarg;
2136 extsym_start = extsym_iter;
2137 break;
2138 case 'm':
2139 modversions = 1;
2140 break;
2141 case 'o':
2142 dump_write = optarg;
2143 break;
2144 case 'a':
2145 all_versions = 1;
2146 break;
2147 case 's':
2148 vmlinux_section_warnings = 0;
2149 break;
2150 case 'S':
2151 sec_mismatch_verbose = 0;
2152 break;
2153 case 'T':
2154 files_source = optarg;
2155 break;
2156 case 'w':
2157 warn_unresolved = 1;
2158 break;
2159 default:
2160 exit(1);
2161 }
2162 }
2163
2164 if (kernel_read)
2165 read_dump(kernel_read, 1);
2166 if (module_read)
2167 read_dump(module_read, 0);
2168 while (extsym_start) {
2169 read_dump(extsym_start->file, 0);
2170 extsym_iter = extsym_start->next;
2171 free(extsym_start);
2172 extsym_start = extsym_iter;
2173 }
2174
2175 while (optind < argc)
2176 read_symbols(argv[optind++]);
2177
2178 if (files_source)
2179 read_symbols_from_files(files_source);
2180
2181 for (mod = modules; mod; mod = mod->next) {
2182 if (mod->skip)
2183 continue;
2184 check_exports(mod);
2185 }
2186
2187 err = 0;
2188
2189 for (mod = modules; mod; mod = mod->next) {
2190 char fname[strlen(mod->name) + 10];
2191
2192 if (mod->skip)
2193 continue;
2194
2195 buf.pos = 0;
2196
2197 add_header(&buf, mod);
2198 add_intree_flag(&buf, !external_module);
2199 add_staging_flag(&buf, mod->name);
2200 err |= add_versions(&buf, mod);
2201 add_depends(&buf, mod, modules);
2202 add_moddevtable(&buf, mod);
2203 add_srcversion(&buf, mod);
2204
2205 sprintf(fname, "%s.mod.c", mod->name);
2206 write_if_changed(&buf, fname);
2207 }
2208
2209 if (dump_write)
2210 write_dump(dump_write);
2211 if (sec_mismatch_count && !sec_mismatch_verbose)
2212 warn("modpost: Found %d section mismatch(es).\n"
2213 "To see full details build your kernel with:\n"
2214 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2215 sec_mismatch_count);
2216
2217 return err;
2218 }
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