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workqueue: use mod_delayed_work() instead of cancel + queue
[linux-2.6/libata-dev.git] / scripts / mod / modpost.c
blob68e9f5ed0a6f31fc414be51e7289573dc112145f
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 "modpost.h"
19 #include "../../include/generated/autoconf.h"
20 #include "../../include/linux/license.h"
21
22 /* Some toolchains use a `_' prefix for all user symbols. */
23 #ifdef CONFIG_SYMBOL_PREFIX
24 #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
25 #else
26 #define MODULE_SYMBOL_PREFIX ""
27 #endif
28
29
30 /* Are we using CONFIG_MODVERSIONS? */
31 int modversions = 0;
32 /* Warn about undefined symbols? (do so if we have vmlinux) */
33 int have_vmlinux = 0;
34 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
35 static int all_versions = 0;
36 /* If we are modposting external module set to 1 */
37 static int external_module = 0;
38 /* Warn about section mismatch in vmlinux if set to 1 */
39 static int vmlinux_section_warnings = 1;
40 /* Only warn about unresolved symbols */
41 static int warn_unresolved = 0;
42 /* How a symbol is exported */
43 static int sec_mismatch_count = 0;
44 static int sec_mismatch_verbose = 1;
45
46 enum export {
47 export_plain, export_unused, export_gpl,
48 export_unused_gpl, export_gpl_future, export_unknown
49 };
50
51 #define PRINTF __attribute__ ((format (printf, 1, 2)))
52
53 PRINTF void fatal(const char *fmt, ...)
54 {
55 va_list arglist;
56
57 fprintf(stderr, "FATAL: ");
58
59 va_start(arglist, fmt);
60 vfprintf(stderr, fmt, arglist);
61 va_end(arglist);
62
63 exit(1);
64 }
65
66 PRINTF void warn(const char *fmt, ...)
67 {
68 va_list arglist;
69
70 fprintf(stderr, "WARNING: ");
71
72 va_start(arglist, fmt);
73 vfprintf(stderr, fmt, arglist);
74 va_end(arglist);
75 }
76
77 PRINTF void merror(const char *fmt, ...)
78 {
79 va_list arglist;
80
81 fprintf(stderr, "ERROR: ");
82
83 va_start(arglist, fmt);
84 vfprintf(stderr, fmt, arglist);
85 va_end(arglist);
86 }
87
88 static int is_vmlinux(const char *modname)
89 {
90 const char *myname;
91
92 myname = strrchr(modname, '/');
93 if (myname)
94 myname++;
95 else
96 myname = modname;
97
98 return (strcmp(myname, "vmlinux") == 0) ||
99 (strcmp(myname, "vmlinux.o") == 0);
100 }
101
102 void *do_nofail(void *ptr, const char *expr)
103 {
104 if (!ptr)
105 fatal("modpost: Memory allocation failure: %s.\n", expr);
106
107 return ptr;
108 }
109
110 /* A list of all modules we processed */
111 static struct module *modules;
112
113 static struct module *find_module(char *modname)
114 {
115 struct module *mod;
116
117 for (mod = modules; mod; mod = mod->next)
118 if (strcmp(mod->name, modname) == 0)
119 break;
120 return mod;
121 }
122
123 static struct module *new_module(char *modname)
124 {
125 struct module *mod;
126 char *p, *s;
127
128 mod = NOFAIL(malloc(sizeof(*mod)));
129 memset(mod, 0, sizeof(*mod));
130 p = NOFAIL(strdup(modname));
131
132 /* strip trailing .o */
133 s = strrchr(p, '.');
134 if (s != NULL)
135 if (strcmp(s, ".o") == 0) {
136 *s = '\0';
137 mod->is_dot_o = 1;
138 }
139
140 /* add to list */
141 mod->name = p;
142 mod->gpl_compatible = -1;
143 mod->next = modules;
144 modules = mod;
145
146 return mod;
147 }
148
149 /* A hash of all exported symbols,
150 * struct symbol is also used for lists of unresolved symbols */
151
152 #define SYMBOL_HASH_SIZE 1024
153
154 struct symbol {
155 struct symbol *next;
156 struct module *module;
157 unsigned int crc;
158 int crc_valid;
159 unsigned int weak:1;
160 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
161 unsigned int kernel:1; /* 1 if symbol is from kernel
162 * (only for external modules) **/
163 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
164 enum export export; /* Type of export */
165 char name[0];
166 };
167
168 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
169
170 /* This is based on the hash agorithm from gdbm, via tdb */
171 static inline unsigned int tdb_hash(const char *name)
172 {
173 unsigned value; /* Used to compute the hash value. */
174 unsigned i; /* Used to cycle through random values. */
175
176 /* Set the initial value from the key size. */
177 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
178 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
179
180 return (1103515243 * value + 12345);
181 }
182
183 /**
184 * Allocate a new symbols for use in the hash of exported symbols or
185 * the list of unresolved symbols per module
186 **/
187 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
188 struct symbol *next)
189 {
190 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
191
192 memset(s, 0, sizeof(*s));
193 strcpy(s->name, name);
194 s->weak = weak;
195 s->next = next;
196 return s;
197 }
198
199 /* For the hash of exported symbols */
200 static struct symbol *new_symbol(const char *name, struct module *module,
201 enum export export)
202 {
203 unsigned int hash;
204 struct symbol *new;
205
206 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
207 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
208 new->module = module;
209 new->export = export;
210 return new;
211 }
212
213 static struct symbol *find_symbol(const char *name)
214 {
215 struct symbol *s;
216
217 /* For our purposes, .foo matches foo. PPC64 needs this. */
218 if (name[0] == '.')
219 name++;
220
221 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
222 if (strcmp(s->name, name) == 0)
223 return s;
224 }
225 return NULL;
226 }
227
228 static struct {
229 const char *str;
230 enum export export;
231 } export_list[] = {
232 { .str = "EXPORT_SYMBOL", .export = export_plain },
233 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
234 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
235 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
236 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
237 { .str = "(unknown)", .export = export_unknown },
238 };
239
240
241 static const char *export_str(enum export ex)
242 {
243 return export_list[ex].str;
244 }
245
246 static enum export export_no(const char *s)
247 {
248 int i;
249
250 if (!s)
251 return export_unknown;
252 for (i = 0; export_list[i].export != export_unknown; i++) {
253 if (strcmp(export_list[i].str, s) == 0)
254 return export_list[i].export;
255 }
256 return export_unknown;
257 }
258
259 static const char *sec_name(struct elf_info *elf, int secindex);
260
261 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
262
263 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
264 {
265 const char *secname = sec_name(elf, sec);
266
267 if (strstarts(secname, "___ksymtab+"))
268 return export_plain;
269 else if (strstarts(secname, "___ksymtab_unused+"))
270 return export_unused;
271 else if (strstarts(secname, "___ksymtab_gpl+"))
272 return export_gpl;
273 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
274 return export_unused_gpl;
275 else if (strstarts(secname, "___ksymtab_gpl_future+"))
276 return export_gpl_future;
277 else
278 return export_unknown;
279 }
280
281 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
282 {
283 if (sec == elf->export_sec)
284 return export_plain;
285 else if (sec == elf->export_unused_sec)
286 return export_unused;
287 else if (sec == elf->export_gpl_sec)
288 return export_gpl;
289 else if (sec == elf->export_unused_gpl_sec)
290 return export_unused_gpl;
291 else if (sec == elf->export_gpl_future_sec)
292 return export_gpl_future;
293 else
294 return export_unknown;
295 }
296
297 /**
298 * Add an exported symbol - it may have already been added without a
299 * CRC, in this case just update the CRC
300 **/
301 static struct symbol *sym_add_exported(const char *name, struct module *mod,
302 enum export export)
303 {
304 struct symbol *s = find_symbol(name);
305
306 if (!s) {
307 s = new_symbol(name, mod, export);
308 } else {
309 if (!s->preloaded) {
310 warn("%s: '%s' exported twice. Previous export "
311 "was in %s%s\n", mod->name, name,
312 s->module->name,
313 is_vmlinux(s->module->name) ?"":".ko");
314 } else {
315 /* In case Modules.symvers was out of date */
316 s->module = mod;
317 }
318 }
319 s->preloaded = 0;
320 s->vmlinux = is_vmlinux(mod->name);
321 s->kernel = 0;
322 s->export = export;
323 return s;
324 }
325
326 static void sym_update_crc(const char *name, struct module *mod,
327 unsigned int crc, enum export export)
328 {
329 struct symbol *s = find_symbol(name);
330
331 if (!s)
332 s = new_symbol(name, mod, export);
333 s->crc = crc;
334 s->crc_valid = 1;
335 }
336
337 void *grab_file(const char *filename, unsigned long *size)
338 {
339 struct stat st;
340 void *map = MAP_FAILED;
341 int fd;
342
343 fd = open(filename, O_RDONLY);
344 if (fd < 0)
345 return NULL;
346 if (fstat(fd, &st))
347 goto failed;
348
349 *size = st.st_size;
350 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
351
352 failed:
353 close(fd);
354 if (map == MAP_FAILED)
355 return NULL;
356 return map;
357 }
358
359 /**
360 * Return a copy of the next line in a mmap'ed file.
361 * spaces in the beginning of the line is trimmed away.
362 * Return a pointer to a static buffer.
363 **/
364 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
365 {
366 static char line[4096];
367 int skip = 1;
368 size_t len = 0;
369 signed char *p = (signed char *)file + *pos;
370 char *s = line;
371
372 for (; *pos < size ; (*pos)++) {
373 if (skip && isspace(*p)) {
374 p++;
375 continue;
376 }
377 skip = 0;
378 if (*p != '\n' && (*pos < size)) {
379 len++;
380 *s++ = *p++;
381 if (len > 4095)
382 break; /* Too long, stop */
383 } else {
384 /* End of string */
385 *s = '\0';
386 return line;
387 }
388 }
389 /* End of buffer */
390 return NULL;
391 }
392
393 void release_file(void *file, unsigned long size)
394 {
395 munmap(file, size);
396 }
397
398 static int parse_elf(struct elf_info *info, const char *filename)
399 {
400 unsigned int i;
401 Elf_Ehdr *hdr;
402 Elf_Shdr *sechdrs;
403 Elf_Sym *sym;
404 const char *secstrings;
405 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
406
407 hdr = grab_file(filename, &info->size);
408 if (!hdr) {
409 perror(filename);
410 exit(1);
411 }
412 info->hdr = hdr;
413 if (info->size < sizeof(*hdr)) {
414 /* file too small, assume this is an empty .o file */
415 return 0;
416 }
417 /* Is this a valid ELF file? */
418 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
419 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
420 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
421 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
422 /* Not an ELF file - silently ignore it */
423 return 0;
424 }
425 /* Fix endianness in ELF header */
426 hdr->e_type = TO_NATIVE(hdr->e_type);
427 hdr->e_machine = TO_NATIVE(hdr->e_machine);
428 hdr->e_version = TO_NATIVE(hdr->e_version);
429 hdr->e_entry = TO_NATIVE(hdr->e_entry);
430 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
431 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
432 hdr->e_flags = TO_NATIVE(hdr->e_flags);
433 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
434 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
435 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
436 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
437 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
438 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
439 sechdrs = (void *)hdr + hdr->e_shoff;
440 info->sechdrs = sechdrs;
441
442 /* Check if file offset is correct */
443 if (hdr->e_shoff > info->size) {
444 fatal("section header offset=%lu in file '%s' is bigger than "
445 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
446 filename, info->size);
447 return 0;
448 }
449
450 if (hdr->e_shnum == SHN_UNDEF) {
451 /*
452 * There are more than 64k sections,
453 * read count from .sh_size.
454 */
455 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
456 }
457 else {
458 info->num_sections = hdr->e_shnum;
459 }
460 if (hdr->e_shstrndx == SHN_XINDEX) {
461 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
462 }
463 else {
464 info->secindex_strings = hdr->e_shstrndx;
465 }
466
467 /* Fix endianness in section headers */
468 for (i = 0; i < info->num_sections; i++) {
469 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
470 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
471 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
472 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
473 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
474 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
475 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
476 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
477 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
478 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
479 }
480 /* Find symbol table. */
481 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
482 for (i = 1; i < info->num_sections; i++) {
483 const char *secname;
484 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
485
486 if (!nobits && sechdrs[i].sh_offset > info->size) {
487 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
488 "sizeof(*hrd)=%zu\n", filename,
489 (unsigned long)sechdrs[i].sh_offset,
490 sizeof(*hdr));
491 return 0;
492 }
493 secname = secstrings + sechdrs[i].sh_name;
494 if (strcmp(secname, ".modinfo") == 0) {
495 if (nobits)
496 fatal("%s has NOBITS .modinfo\n", filename);
497 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
498 info->modinfo_len = sechdrs[i].sh_size;
499 } else if (strcmp(secname, "__ksymtab") == 0)
500 info->export_sec = i;
501 else if (strcmp(secname, "__ksymtab_unused") == 0)
502 info->export_unused_sec = i;
503 else if (strcmp(secname, "__ksymtab_gpl") == 0)
504 info->export_gpl_sec = i;
505 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
506 info->export_unused_gpl_sec = i;
507 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
508 info->export_gpl_future_sec = i;
509
510 if (sechdrs[i].sh_type == SHT_SYMTAB) {
511 unsigned int sh_link_idx;
512 symtab_idx = i;
513 info->symtab_start = (void *)hdr +
514 sechdrs[i].sh_offset;
515 info->symtab_stop = (void *)hdr +
516 sechdrs[i].sh_offset + sechdrs[i].sh_size;
517 sh_link_idx = sechdrs[i].sh_link;
518 info->strtab = (void *)hdr +
519 sechdrs[sh_link_idx].sh_offset;
520 }
521
522 /* 32bit section no. table? ("more than 64k sections") */
523 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
524 symtab_shndx_idx = i;
525 info->symtab_shndx_start = (void *)hdr +
526 sechdrs[i].sh_offset;
527 info->symtab_shndx_stop = (void *)hdr +
528 sechdrs[i].sh_offset + sechdrs[i].sh_size;
529 }
530 }
531 if (!info->symtab_start)
532 fatal("%s has no symtab?\n", filename);
533
534 /* Fix endianness in symbols */
535 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
536 sym->st_shndx = TO_NATIVE(sym->st_shndx);
537 sym->st_name = TO_NATIVE(sym->st_name);
538 sym->st_value = TO_NATIVE(sym->st_value);
539 sym->st_size = TO_NATIVE(sym->st_size);
540 }
541
542 if (symtab_shndx_idx != ~0U) {
543 Elf32_Word *p;
544 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
545 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
546 filename, sechdrs[symtab_shndx_idx].sh_link,
547 symtab_idx);
548 /* Fix endianness */
549 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
550 p++)
551 *p = TO_NATIVE(*p);
552 }
553
554 return 1;
555 }
556
557 static void parse_elf_finish(struct elf_info *info)
558 {
559 release_file(info->hdr, info->size);
560 }
561
562 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
563 {
564 /* ignore __this_module, it will be resolved shortly */
565 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
566 return 1;
567 /* ignore global offset table */
568 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
569 return 1;
570 if (info->hdr->e_machine == EM_PPC)
571 /* Special register function linked on all modules during final link of .ko */
572 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
573 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
574 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
575 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
576 return 1;
577 if (info->hdr->e_machine == EM_PPC64)
578 /* Special register function linked on all modules during final link of .ko */
579 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
580 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
581 return 1;
582 /* Do not ignore this symbol */
583 return 0;
584 }
585
586 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
587 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
588
589 static void handle_modversions(struct module *mod, struct elf_info *info,
590 Elf_Sym *sym, const char *symname)
591 {
592 unsigned int crc;
593 enum export export;
594
595 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
596 strncmp(symname, "__ksymtab", 9) == 0)
597 export = export_from_secname(info, get_secindex(info, sym));
598 else
599 export = export_from_sec(info, get_secindex(info, sym));
600
601 switch (sym->st_shndx) {
602 case SHN_COMMON:
603 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
604 break;
605 case SHN_ABS:
606 /* CRC'd symbol */
607 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
608 crc = (unsigned int) sym->st_value;
609 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
610 export);
611 }
612 break;
613 case SHN_UNDEF:
614 /* undefined symbol */
615 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
616 ELF_ST_BIND(sym->st_info) != STB_WEAK)
617 break;
618 if (ignore_undef_symbol(info, symname))
619 break;
620 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
621 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
622 /* add compatibility with older glibc */
623 #ifndef STT_SPARC_REGISTER
624 #define STT_SPARC_REGISTER STT_REGISTER
625 #endif
626 if (info->hdr->e_machine == EM_SPARC ||
627 info->hdr->e_machine == EM_SPARCV9) {
628 /* Ignore register directives. */
629 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
630 break;
631 if (symname[0] == '.') {
632 char *munged = strdup(symname);
633 munged[0] = '_';
634 munged[1] = toupper(munged[1]);
635 symname = munged;
636 }
637 }
638 #endif
639
640 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
641 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
642 mod->unres =
643 alloc_symbol(symname +
644 strlen(MODULE_SYMBOL_PREFIX),
645 ELF_ST_BIND(sym->st_info) == STB_WEAK,
646 mod->unres);
647 }
648 break;
649 default:
650 /* All exported symbols */
651 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
652 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
653 export);
654 }
655 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
656 mod->has_init = 1;
657 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
658 mod->has_cleanup = 1;
659 break;
660 }
661 }
662
663 /**
664 * Parse tag=value strings from .modinfo section
665 **/
666 static char *next_string(char *string, unsigned long *secsize)
667 {
668 /* Skip non-zero chars */
669 while (string[0]) {
670 string++;
671 if ((*secsize)-- <= 1)
672 return NULL;
673 }
674
675 /* Skip any zero padding. */
676 while (!string[0]) {
677 string++;
678 if ((*secsize)-- <= 1)
679 return NULL;
680 }
681 return string;
682 }
683
684 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
685 const char *tag, char *info)
686 {
687 char *p;
688 unsigned int taglen = strlen(tag);
689 unsigned long size = modinfo_len;
690
691 if (info) {
692 size -= info - (char *)modinfo;
693 modinfo = next_string(info, &size);
694 }
695
696 for (p = modinfo; p; p = next_string(p, &size)) {
697 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
698 return p + taglen + 1;
699 }
700 return NULL;
701 }
702
703 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
704 const char *tag)
705
706 {
707 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
708 }
709
710 /**
711 * Test if string s ends in string sub
712 * return 0 if match
713 **/
714 static int strrcmp(const char *s, const char *sub)
715 {
716 int slen, sublen;
717
718 if (!s || !sub)
719 return 1;
720
721 slen = strlen(s);
722 sublen = strlen(sub);
723
724 if ((slen == 0) || (sublen == 0))
725 return 1;
726
727 if (sublen > slen)
728 return 1;
729
730 return memcmp(s + slen - sublen, sub, sublen);
731 }
732
733 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
734 {
735 if (sym)
736 return elf->strtab + sym->st_name;
737 else
738 return "(unknown)";
739 }
740
741 static const char *sec_name(struct elf_info *elf, int secindex)
742 {
743 Elf_Shdr *sechdrs = elf->sechdrs;
744 return (void *)elf->hdr +
745 elf->sechdrs[elf->secindex_strings].sh_offset +
746 sechdrs[secindex].sh_name;
747 }
748
749 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
750 {
751 return (void *)elf->hdr +
752 elf->sechdrs[elf->secindex_strings].sh_offset +
753 sechdr->sh_name;
754 }
755
756 /* if sym is empty or point to a string
757 * like ".[0-9]+" then return 1.
758 * This is the optional prefix added by ld to some sections
759 */
760 static int number_prefix(const char *sym)
761 {
762 if (*sym++ == '\0')
763 return 1;
764 if (*sym != '.')
765 return 0;
766 do {
767 char c = *sym++;
768 if (c < '0' || c > '9')
769 return 0;
770 } while (*sym);
771 return 1;
772 }
773
774 /* The pattern is an array of simple patterns.
775 * "foo" will match an exact string equal to "foo"
776 * "*foo" will match a string that ends with "foo"
777 * "foo*" will match a string that begins with "foo"
778 * "foo$" will match a string equal to "foo" or "foo.1"
779 * where the '1' can be any number including several digits.
780 * The $ syntax is for sections where ld append a dot number
781 * to make section name unique.
782 */
783 static int match(const char *sym, const char * const pat[])
784 {
785 const char *p;
786 while (*pat) {
787 p = *pat++;
788 const char *endp = p + strlen(p) - 1;
789
790 /* "*foo" */
791 if (*p == '*') {
792 if (strrcmp(sym, p + 1) == 0)
793 return 1;
794 }
795 /* "foo*" */
796 else if (*endp == '*') {
797 if (strncmp(sym, p, strlen(p) - 1) == 0)
798 return 1;
799 }
800 /* "foo$" */
801 else if (*endp == '$') {
802 if (strncmp(sym, p, strlen(p) - 1) == 0) {
803 if (number_prefix(sym + strlen(p) - 1))
804 return 1;
805 }
806 }
807 /* no wildcards */
808 else {
809 if (strcmp(p, sym) == 0)
810 return 1;
811 }
812 }
813 /* no match */
814 return 0;
815 }
816
817 /* sections that we do not want to do full section mismatch check on */
818 static const char *section_white_list[] =
819 {
820 ".comment*",
821 ".debug*",
822 ".zdebug*", /* Compressed debug sections. */
823 ".GCC-command-line", /* mn10300 */
824 ".mdebug*", /* alpha, score, mips etc. */
825 ".pdr", /* alpha, score, mips etc. */
826 ".stab*",
827 ".note*",
828 ".got*",
829 ".toc*",
830 NULL
831 };
832
833 /*
834 * This is used to find sections missing the SHF_ALLOC flag.
835 * The cause of this is often a section specified in assembler
836 * without "ax" / "aw".
837 */
838 static void check_section(const char *modname, struct elf_info *elf,
839 Elf_Shdr *sechdr)
840 {
841 const char *sec = sech_name(elf, sechdr);
842
843 if (sechdr->sh_type == SHT_PROGBITS &&
844 !(sechdr->sh_flags & SHF_ALLOC) &&
845 !match(sec, section_white_list)) {
846 warn("%s (%s): unexpected non-allocatable section.\n"
847 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
848 "Note that for example <linux/init.h> contains\n"
849 "section definitions for use in .S files.\n\n",
850 modname, sec);
851 }
852 }
853
854
855
856 #define ALL_INIT_DATA_SECTIONS \
857 ".init.setup$", ".init.rodata$", \
858 ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$", \
859 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
860 #define ALL_EXIT_DATA_SECTIONS \
861 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
862
863 #define ALL_INIT_TEXT_SECTIONS \
864 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
865 #define ALL_EXIT_TEXT_SECTIONS \
866 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
867
868 #define ALL_PCI_INIT_SECTIONS \
869 ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
870 ".pci_fixup_enable$", ".pci_fixup_resume$", \
871 ".pci_fixup_resume_early$", ".pci_fixup_suspend$"
872
873 #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \
874 MEM_INIT_SECTIONS
875 #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \
876 MEM_EXIT_SECTIONS
877
878 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
879 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
880
881 #define DATA_SECTIONS ".data$", ".data.rel$"
882 #define TEXT_SECTIONS ".text$"
883
884 #define INIT_SECTIONS ".init.*"
885 #define DEV_INIT_SECTIONS ".devinit.*"
886 #define CPU_INIT_SECTIONS ".cpuinit.*"
887 #define MEM_INIT_SECTIONS ".meminit.*"
888
889 #define EXIT_SECTIONS ".exit.*"
890 #define DEV_EXIT_SECTIONS ".devexit.*"
891 #define CPU_EXIT_SECTIONS ".cpuexit.*"
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 devinit/cpuinit/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 cpuinit code/data from meminit code/data */
987 {
988 .fromsec = { MEM_INIT_SECTIONS, NULL },
989 .tosec = { CPU_INIT_SECTIONS, NULL },
990 .mismatch = XXXINIT_TO_SOME_INIT,
991 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
992 },
993 /* Do not reference meminit code/data from cpuinit code/data */
994 {
995 .fromsec = { CPU_INIT_SECTIONS, NULL },
996 .tosec = { MEM_INIT_SECTIONS, NULL },
997 .mismatch = XXXINIT_TO_SOME_INIT,
998 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
999 },
1000 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
1001 {
1002 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1003 .tosec = { EXIT_SECTIONS, NULL },
1004 .mismatch = XXXEXIT_TO_SOME_EXIT,
1005 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1006 },
1007 /* Do not reference cpuexit code/data from memexit code/data */
1008 {
1009 .fromsec = { MEM_EXIT_SECTIONS, NULL },
1010 .tosec = { CPU_EXIT_SECTIONS, NULL },
1011 .mismatch = XXXEXIT_TO_SOME_EXIT,
1012 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1013 },
1014 /* Do not reference memexit code/data from cpuexit code/data */
1015 {
1016 .fromsec = { CPU_EXIT_SECTIONS, NULL },
1017 .tosec = { MEM_EXIT_SECTIONS, NULL },
1018 .mismatch = XXXEXIT_TO_SOME_EXIT,
1019 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1020 },
1021 /* Do not use exit code/data from init code */
1022 {
1023 .fromsec = { ALL_INIT_SECTIONS, NULL },
1024 .tosec = { ALL_EXIT_SECTIONS, NULL },
1025 .mismatch = ANY_INIT_TO_ANY_EXIT,
1026 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1027 },
1028 /* Do not use init code/data from exit code */
1029 {
1030 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1031 .tosec = { ALL_INIT_SECTIONS, NULL },
1032 .mismatch = ANY_EXIT_TO_ANY_INIT,
1033 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1034 },
1035 {
1036 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1037 .tosec = { INIT_SECTIONS, NULL },
1038 .mismatch = ANY_INIT_TO_ANY_EXIT,
1039 .symbol_white_list = { NULL },
1040 },
1041 /* Do not export init/exit functions or data */
1042 {
1043 .fromsec = { "__ksymtab*", NULL },
1044 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1045 .mismatch = EXPORT_TO_INIT_EXIT,
1046 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1047 }
1048 };
1049
1050 static const struct sectioncheck *section_mismatch(
1051 const char *fromsec, const char *tosec)
1052 {
1053 int i;
1054 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1055 const struct sectioncheck *check = &sectioncheck[0];
1056
1057 for (i = 0; i < elems; i++) {
1058 if (match(fromsec, check->fromsec) &&
1059 match(tosec, check->tosec))
1060 return check;
1061 check++;
1062 }
1063 return NULL;
1064 }
1065
1066 /**
1067 * Whitelist to allow certain references to pass with no warning.
1068 *
1069 * Pattern 1:
1070 * If a module parameter is declared __initdata and permissions=0
1071 * then this is legal despite the warning generated.
1072 * We cannot see value of permissions here, so just ignore
1073 * this pattern.
1074 * The pattern is identified by:
1075 * tosec = .init.data
1076 * fromsec = .data*
1077 * atsym =__param*
1078 *
1079 * Pattern 1a:
1080 * module_param_call() ops can refer to __init set function if permissions=0
1081 * The pattern is identified by:
1082 * tosec = .init.text
1083 * fromsec = .data*
1084 * atsym = __param_ops_*
1085 *
1086 * Pattern 2:
1087 * Many drivers utilise a *driver container with references to
1088 * add, remove, probe functions etc.
1089 * These functions may often be marked __devinit and we do not want to
1090 * warn here.
1091 * the pattern is identified by:
1092 * tosec = init or exit section
1093 * fromsec = data section
1094 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1095 * *probe_one, *_console, *_timer
1096 *
1097 * Pattern 3:
1098 * Whitelist all references from .head.text to any init section
1099 *
1100 * Pattern 4:
1101 * Some symbols belong to init section but still it is ok to reference
1102 * these from non-init sections as these symbols don't have any memory
1103 * allocated for them and symbol address and value are same. So even
1104 * if init section is freed, its ok to reference those symbols.
1105 * For ex. symbols marking the init section boundaries.
1106 * This pattern is identified by
1107 * refsymname = __init_begin, _sinittext, _einittext
1108 *
1109 **/
1110 static int secref_whitelist(const struct sectioncheck *mismatch,
1111 const char *fromsec, const char *fromsym,
1112 const char *tosec, const char *tosym)
1113 {
1114 /* Check for pattern 1 */
1115 if (match(tosec, init_data_sections) &&
1116 match(fromsec, data_sections) &&
1117 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1118 return 0;
1119
1120 /* Check for pattern 1a */
1121 if (strcmp(tosec, ".init.text") == 0 &&
1122 match(fromsec, data_sections) &&
1123 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1124 return 0;
1125
1126 /* Check for pattern 2 */
1127 if (match(tosec, init_exit_sections) &&
1128 match(fromsec, data_sections) &&
1129 match(fromsym, mismatch->symbol_white_list))
1130 return 0;
1131
1132 /* Check for pattern 3 */
1133 if (match(fromsec, head_sections) &&
1134 match(tosec, init_sections))
1135 return 0;
1136
1137 /* Check for pattern 4 */
1138 if (match(tosym, linker_symbols))
1139 return 0;
1140
1141 return 1;
1142 }
1143
1144 /**
1145 * Find symbol based on relocation record info.
1146 * In some cases the symbol supplied is a valid symbol so
1147 * return refsym. If st_name != 0 we assume this is a valid symbol.
1148 * In other cases the symbol needs to be looked up in the symbol table
1149 * based on section and address.
1150 * **/
1151 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1152 Elf_Sym *relsym)
1153 {
1154 Elf_Sym *sym;
1155 Elf_Sym *near = NULL;
1156 Elf64_Sword distance = 20;
1157 Elf64_Sword d;
1158 unsigned int relsym_secindex;
1159
1160 if (relsym->st_name != 0)
1161 return relsym;
1162
1163 relsym_secindex = get_secindex(elf, relsym);
1164 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1165 if (get_secindex(elf, sym) != relsym_secindex)
1166 continue;
1167 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1168 continue;
1169 if (sym->st_value == addr)
1170 return sym;
1171 /* Find a symbol nearby - addr are maybe negative */
1172 d = sym->st_value - addr;
1173 if (d < 0)
1174 d = addr - sym->st_value;
1175 if (d < distance) {
1176 distance = d;
1177 near = sym;
1178 }
1179 }
1180 /* We need a close match */
1181 if (distance < 20)
1182 return near;
1183 else
1184 return NULL;
1185 }
1186
1187 static inline int is_arm_mapping_symbol(const char *str)
1188 {
1189 return str[0] == '$' && strchr("atd", str[1])
1190 && (str[2] == '\0' || str[2] == '.');
1191 }
1192
1193 /*
1194 * If there's no name there, ignore it; likewise, ignore it if it's
1195 * one of the magic symbols emitted used by current ARM tools.
1196 *
1197 * Otherwise if find_symbols_between() returns those symbols, they'll
1198 * fail the whitelist tests and cause lots of false alarms ... fixable
1199 * only by merging __exit and __init sections into __text, bloating
1200 * the kernel (which is especially evil on embedded platforms).
1201 */
1202 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1203 {
1204 const char *name = elf->strtab + sym->st_name;
1205
1206 if (!name || !strlen(name))
1207 return 0;
1208 return !is_arm_mapping_symbol(name);
1209 }
1210
1211 /*
1212 * Find symbols before or equal addr and after addr - in the section sec.
1213 * If we find two symbols with equal offset prefer one with a valid name.
1214 * The ELF format may have a better way to detect what type of symbol
1215 * it is, but this works for now.
1216 **/
1217 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1218 const char *sec)
1219 {
1220 Elf_Sym *sym;
1221 Elf_Sym *near = NULL;
1222 Elf_Addr distance = ~0;
1223
1224 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1225 const char *symsec;
1226
1227 if (is_shndx_special(sym->st_shndx))
1228 continue;
1229 symsec = sec_name(elf, get_secindex(elf, sym));
1230 if (strcmp(symsec, sec) != 0)
1231 continue;
1232 if (!is_valid_name(elf, sym))
1233 continue;
1234 if (sym->st_value <= addr) {
1235 if ((addr - sym->st_value) < distance) {
1236 distance = addr - sym->st_value;
1237 near = sym;
1238 } else if ((addr - sym->st_value) == distance) {
1239 near = sym;
1240 }
1241 }
1242 }
1243 return near;
1244 }
1245
1246 /*
1247 * Convert a section name to the function/data attribute
1248 * .init.text => __init
1249 * .cpuinit.data => __cpudata
1250 * .memexitconst => __memconst
1251 * etc.
1252 *
1253 * The memory of returned value has been allocated on a heap. The user of this
1254 * method should free it after usage.
1255 */
1256 static char *sec2annotation(const char *s)
1257 {
1258 if (match(s, init_exit_sections)) {
1259 char *p = malloc(20);
1260 char *r = p;
1261
1262 *p++ = '_';
1263 *p++ = '_';
1264 if (*s == '.')
1265 s++;
1266 while (*s && *s != '.')
1267 *p++ = *s++;
1268 *p = '\0';
1269 if (*s == '.')
1270 s++;
1271 if (strstr(s, "rodata") != NULL)
1272 strcat(p, "const ");
1273 else if (strstr(s, "data") != NULL)
1274 strcat(p, "data ");
1275 else
1276 strcat(p, " ");
1277 return r;
1278 } else {
1279 return strdup("");
1280 }
1281 }
1282
1283 static int is_function(Elf_Sym *sym)
1284 {
1285 if (sym)
1286 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1287 else
1288 return -1;
1289 }
1290
1291 static void print_section_list(const char * const list[20])
1292 {
1293 const char *const *s = list;
1294
1295 while (*s) {
1296 fprintf(stderr, "%s", *s);
1297 s++;
1298 if (*s)
1299 fprintf(stderr, ", ");
1300 }
1301 fprintf(stderr, "\n");
1302 }
1303
1304 /*
1305 * Print a warning about a section mismatch.
1306 * Try to find symbols near it so user can find it.
1307 * Check whitelist before warning - it may be a false positive.
1308 */
1309 static void report_sec_mismatch(const char *modname,
1310 const struct sectioncheck *mismatch,
1311 const char *fromsec,
1312 unsigned long long fromaddr,
1313 const char *fromsym,
1314 int from_is_func,
1315 const char *tosec, const char *tosym,
1316 int to_is_func)
1317 {
1318 const char *from, *from_p;
1319 const char *to, *to_p;
1320 char *prl_from;
1321 char *prl_to;
1322
1323 switch (from_is_func) {
1324 case 0: from = "variable"; from_p = ""; break;
1325 case 1: from = "function"; from_p = "()"; break;
1326 default: from = "(unknown reference)"; from_p = ""; break;
1327 }
1328 switch (to_is_func) {
1329 case 0: to = "variable"; to_p = ""; break;
1330 case 1: to = "function"; to_p = "()"; break;
1331 default: to = "(unknown reference)"; to_p = ""; break;
1332 }
1333
1334 sec_mismatch_count++;
1335 if (!sec_mismatch_verbose)
1336 return;
1337
1338 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1339 "to the %s %s:%s%s\n",
1340 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1341 tosym, to_p);
1342
1343 switch (mismatch->mismatch) {
1344 case TEXT_TO_ANY_INIT:
1345 prl_from = sec2annotation(fromsec);
1346 prl_to = sec2annotation(tosec);
1347 fprintf(stderr,
1348 "The function %s%s() references\n"
1349 "the %s %s%s%s.\n"
1350 "This is often because %s lacks a %s\n"
1351 "annotation or the annotation of %s is wrong.\n",
1352 prl_from, fromsym,
1353 to, prl_to, tosym, to_p,
1354 fromsym, prl_to, tosym);
1355 free(prl_from);
1356 free(prl_to);
1357 break;
1358 case DATA_TO_ANY_INIT: {
1359 prl_to = sec2annotation(tosec);
1360 fprintf(stderr,
1361 "The variable %s references\n"
1362 "the %s %s%s%s\n"
1363 "If the reference is valid then annotate the\n"
1364 "variable with __init* or __refdata (see linux/init.h) "
1365 "or name the variable:\n",
1366 fromsym, to, prl_to, tosym, to_p);
1367 print_section_list(mismatch->symbol_white_list);
1368 free(prl_to);
1369 break;
1370 }
1371 case TEXT_TO_ANY_EXIT:
1372 prl_to = sec2annotation(tosec);
1373 fprintf(stderr,
1374 "The function %s() references a %s in an exit section.\n"
1375 "Often the %s %s%s has valid usage outside the exit section\n"
1376 "and the fix is to remove the %sannotation of %s.\n",
1377 fromsym, to, to, tosym, to_p, prl_to, tosym);
1378 free(prl_to);
1379 break;
1380 case DATA_TO_ANY_EXIT: {
1381 prl_to = sec2annotation(tosec);
1382 fprintf(stderr,
1383 "The variable %s references\n"
1384 "the %s %s%s%s\n"
1385 "If the reference is valid then annotate the\n"
1386 "variable with __exit* (see linux/init.h) or "
1387 "name the variable:\n",
1388 fromsym, to, prl_to, tosym, to_p);
1389 print_section_list(mismatch->symbol_white_list);
1390 free(prl_to);
1391 break;
1392 }
1393 case XXXINIT_TO_SOME_INIT:
1394 case XXXEXIT_TO_SOME_EXIT:
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 "If %s is only used by %s then\n"
1401 "annotate %s with a matching annotation.\n",
1402 from, prl_from, fromsym, from_p,
1403 to, prl_to, tosym, to_p,
1404 tosym, fromsym, tosym);
1405 free(prl_from);
1406 free(prl_to);
1407 break;
1408 case ANY_INIT_TO_ANY_EXIT:
1409 prl_from = sec2annotation(fromsec);
1410 prl_to = sec2annotation(tosec);
1411 fprintf(stderr,
1412 "The %s %s%s%s references\n"
1413 "a %s %s%s%s.\n"
1414 "This is often seen when error handling "
1415 "in the init function\n"
1416 "uses functionality in the exit path.\n"
1417 "The fix is often to remove the %sannotation of\n"
1418 "%s%s so it may be used outside an exit section.\n",
1419 from, prl_from, fromsym, from_p,
1420 to, prl_to, tosym, to_p,
1421 prl_to, tosym, to_p);
1422 free(prl_from);
1423 free(prl_to);
1424 break;
1425 case ANY_EXIT_TO_ANY_INIT:
1426 prl_from = sec2annotation(fromsec);
1427 prl_to = sec2annotation(tosec);
1428 fprintf(stderr,
1429 "The %s %s%s%s references\n"
1430 "a %s %s%s%s.\n"
1431 "This is often seen when error handling "
1432 "in the exit function\n"
1433 "uses functionality in the init path.\n"
1434 "The fix is often to remove the %sannotation of\n"
1435 "%s%s so it may be used outside an init section.\n",
1436 from, prl_from, fromsym, from_p,
1437 to, prl_to, tosym, to_p,
1438 prl_to, tosym, to_p);
1439 free(prl_from);
1440 free(prl_to);
1441 break;
1442 case EXPORT_TO_INIT_EXIT:
1443 prl_to = sec2annotation(tosec);
1444 fprintf(stderr,
1445 "The symbol %s is exported and annotated %s\n"
1446 "Fix this by removing the %sannotation of %s "
1447 "or drop the export.\n",
1448 tosym, prl_to, prl_to, tosym);
1449 free(prl_to);
1450 break;
1451 }
1452 fprintf(stderr, "\n");
1453 }
1454
1455 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1456 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1457 {
1458 const char *tosec;
1459 const struct sectioncheck *mismatch;
1460
1461 tosec = sec_name(elf, get_secindex(elf, sym));
1462 mismatch = section_mismatch(fromsec, tosec);
1463 if (mismatch) {
1464 Elf_Sym *to;
1465 Elf_Sym *from;
1466 const char *tosym;
1467 const char *fromsym;
1468
1469 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1470 fromsym = sym_name(elf, from);
1471 to = find_elf_symbol(elf, r->r_addend, sym);
1472 tosym = sym_name(elf, to);
1473
1474 /* check whitelist - we may ignore it */
1475 if (secref_whitelist(mismatch,
1476 fromsec, fromsym, tosec, tosym)) {
1477 report_sec_mismatch(modname, mismatch,
1478 fromsec, r->r_offset, fromsym,
1479 is_function(from), tosec, tosym,
1480 is_function(to));
1481 }
1482 }
1483 }
1484
1485 static unsigned int *reloc_location(struct elf_info *elf,
1486 Elf_Shdr *sechdr, Elf_Rela *r)
1487 {
1488 Elf_Shdr *sechdrs = elf->sechdrs;
1489 int section = sechdr->sh_info;
1490
1491 return (void *)elf->hdr + sechdrs[section].sh_offset +
1492 r->r_offset;
1493 }
1494
1495 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1496 {
1497 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1498 unsigned int *location = reloc_location(elf, sechdr, r);
1499
1500 switch (r_typ) {
1501 case R_386_32:
1502 r->r_addend = TO_NATIVE(*location);
1503 break;
1504 case R_386_PC32:
1505 r->r_addend = TO_NATIVE(*location) + 4;
1506 /* For CONFIG_RELOCATABLE=y */
1507 if (elf->hdr->e_type == ET_EXEC)
1508 r->r_addend += r->r_offset;
1509 break;
1510 }
1511 return 0;
1512 }
1513
1514 #ifndef R_ARM_CALL
1515 #define R_ARM_CALL 28
1516 #endif
1517 #ifndef R_ARM_JUMP24
1518 #define R_ARM_JUMP24 29
1519 #endif
1520
1521 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1522 {
1523 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1524
1525 switch (r_typ) {
1526 case R_ARM_ABS32:
1527 /* From ARM ABI: (S + A) | T */
1528 r->r_addend = (int)(long)
1529 (elf->symtab_start + ELF_R_SYM(r->r_info));
1530 break;
1531 case R_ARM_PC24:
1532 case R_ARM_CALL:
1533 case R_ARM_JUMP24:
1534 /* From ARM ABI: ((S + A) | T) - P */
1535 r->r_addend = (int)(long)(elf->hdr +
1536 sechdr->sh_offset +
1537 (r->r_offset - sechdr->sh_addr));
1538 break;
1539 default:
1540 return 1;
1541 }
1542 return 0;
1543 }
1544
1545 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1546 {
1547 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1548 unsigned int *location = reloc_location(elf, sechdr, r);
1549 unsigned int inst;
1550
1551 if (r_typ == R_MIPS_HI16)
1552 return 1; /* skip this */
1553 inst = TO_NATIVE(*location);
1554 switch (r_typ) {
1555 case R_MIPS_LO16:
1556 r->r_addend = inst & 0xffff;
1557 break;
1558 case R_MIPS_26:
1559 r->r_addend = (inst & 0x03ffffff) << 2;
1560 break;
1561 case R_MIPS_32:
1562 r->r_addend = inst;
1563 break;
1564 }
1565 return 0;
1566 }
1567
1568 static void section_rela(const char *modname, struct elf_info *elf,
1569 Elf_Shdr *sechdr)
1570 {
1571 Elf_Sym *sym;
1572 Elf_Rela *rela;
1573 Elf_Rela r;
1574 unsigned int r_sym;
1575 const char *fromsec;
1576
1577 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1578 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1579
1580 fromsec = sech_name(elf, sechdr);
1581 fromsec += strlen(".rela");
1582 /* if from section (name) is know good then skip it */
1583 if (match(fromsec, section_white_list))
1584 return;
1585
1586 for (rela = start; rela < stop; rela++) {
1587 r.r_offset = TO_NATIVE(rela->r_offset);
1588 #if KERNEL_ELFCLASS == ELFCLASS64
1589 if (elf->hdr->e_machine == EM_MIPS) {
1590 unsigned int r_typ;
1591 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1592 r_sym = TO_NATIVE(r_sym);
1593 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1594 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1595 } else {
1596 r.r_info = TO_NATIVE(rela->r_info);
1597 r_sym = ELF_R_SYM(r.r_info);
1598 }
1599 #else
1600 r.r_info = TO_NATIVE(rela->r_info);
1601 r_sym = ELF_R_SYM(r.r_info);
1602 #endif
1603 r.r_addend = TO_NATIVE(rela->r_addend);
1604 sym = elf->symtab_start + r_sym;
1605 /* Skip special sections */
1606 if (is_shndx_special(sym->st_shndx))
1607 continue;
1608 check_section_mismatch(modname, elf, &r, sym, fromsec);
1609 }
1610 }
1611
1612 static void section_rel(const char *modname, struct elf_info *elf,
1613 Elf_Shdr *sechdr)
1614 {
1615 Elf_Sym *sym;
1616 Elf_Rel *rel;
1617 Elf_Rela r;
1618 unsigned int r_sym;
1619 const char *fromsec;
1620
1621 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1622 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1623
1624 fromsec = sech_name(elf, sechdr);
1625 fromsec += strlen(".rel");
1626 /* if from section (name) is know good then skip it */
1627 if (match(fromsec, section_white_list))
1628 return;
1629
1630 for (rel = start; rel < stop; rel++) {
1631 r.r_offset = TO_NATIVE(rel->r_offset);
1632 #if KERNEL_ELFCLASS == ELFCLASS64
1633 if (elf->hdr->e_machine == EM_MIPS) {
1634 unsigned int r_typ;
1635 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1636 r_sym = TO_NATIVE(r_sym);
1637 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1638 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1639 } else {
1640 r.r_info = TO_NATIVE(rel->r_info);
1641 r_sym = ELF_R_SYM(r.r_info);
1642 }
1643 #else
1644 r.r_info = TO_NATIVE(rel->r_info);
1645 r_sym = ELF_R_SYM(r.r_info);
1646 #endif
1647 r.r_addend = 0;
1648 switch (elf->hdr->e_machine) {
1649 case EM_386:
1650 if (addend_386_rel(elf, sechdr, &r))
1651 continue;
1652 break;
1653 case EM_ARM:
1654 if (addend_arm_rel(elf, sechdr, &r))
1655 continue;
1656 break;
1657 case EM_MIPS:
1658 if (addend_mips_rel(elf, sechdr, &r))
1659 continue;
1660 break;
1661 }
1662 sym = elf->symtab_start + r_sym;
1663 /* Skip special sections */
1664 if (is_shndx_special(sym->st_shndx))
1665 continue;
1666 check_section_mismatch(modname, elf, &r, sym, fromsec);
1667 }
1668 }
1669
1670 /**
1671 * A module includes a number of sections that are discarded
1672 * either when loaded or when used as built-in.
1673 * For loaded modules all functions marked __init and all data
1674 * marked __initdata will be discarded when the module has been initialized.
1675 * Likewise for modules used built-in the sections marked __exit
1676 * are discarded because __exit marked function are supposed to be called
1677 * only when a module is unloaded which never happens for built-in modules.
1678 * The check_sec_ref() function traverses all relocation records
1679 * to find all references to a section that reference a section that will
1680 * be discarded and warns about it.
1681 **/
1682 static void check_sec_ref(struct module *mod, const char *modname,
1683 struct elf_info *elf)
1684 {
1685 int i;
1686 Elf_Shdr *sechdrs = elf->sechdrs;
1687
1688 /* Walk through all sections */
1689 for (i = 0; i < elf->num_sections; i++) {
1690 check_section(modname, elf, &elf->sechdrs[i]);
1691 /* We want to process only relocation sections and not .init */
1692 if (sechdrs[i].sh_type == SHT_RELA)
1693 section_rela(modname, elf, &elf->sechdrs[i]);
1694 else if (sechdrs[i].sh_type == SHT_REL)
1695 section_rel(modname, elf, &elf->sechdrs[i]);
1696 }
1697 }
1698
1699 static void read_symbols(char *modname)
1700 {
1701 const char *symname;
1702 char *version;
1703 char *license;
1704 struct module *mod;
1705 struct elf_info info = { };
1706 Elf_Sym *sym;
1707
1708 if (!parse_elf(&info, modname))
1709 return;
1710
1711 mod = new_module(modname);
1712
1713 /* When there's no vmlinux, don't print warnings about
1714 * unresolved symbols (since there'll be too many ;) */
1715 if (is_vmlinux(modname)) {
1716 have_vmlinux = 1;
1717 mod->skip = 1;
1718 }
1719
1720 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1721 if (info.modinfo && !license && !is_vmlinux(modname))
1722 warn("modpost: missing MODULE_LICENSE() in %s\n"
1723 "see include/linux/module.h for "
1724 "more information\n", modname);
1725 while (license) {
1726 if (license_is_gpl_compatible(license))
1727 mod->gpl_compatible = 1;
1728 else {
1729 mod->gpl_compatible = 0;
1730 break;
1731 }
1732 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1733 "license", license);
1734 }
1735
1736 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1737 symname = info.strtab + sym->st_name;
1738
1739 handle_modversions(mod, &info, sym, symname);
1740 handle_moddevtable(mod, &info, sym, symname);
1741 }
1742 if (!is_vmlinux(modname) ||
1743 (is_vmlinux(modname) && vmlinux_section_warnings))
1744 check_sec_ref(mod, modname, &info);
1745
1746 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1747 if (version)
1748 maybe_frob_rcs_version(modname, version, info.modinfo,
1749 version - (char *)info.hdr);
1750 if (version || (all_versions && !is_vmlinux(modname)))
1751 get_src_version(modname, mod->srcversion,
1752 sizeof(mod->srcversion)-1);
1753
1754 parse_elf_finish(&info);
1755
1756 /* Our trick to get versioning for module struct etc. - it's
1757 * never passed as an argument to an exported function, so
1758 * the automatic versioning doesn't pick it up, but it's really
1759 * important anyhow */
1760 if (modversions)
1761 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1762 }
1763
1764 #define SZ 500
1765
1766 /* We first write the generated file into memory using the
1767 * following helper, then compare to the file on disk and
1768 * only update the later if anything changed */
1769
1770 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1771 const char *fmt, ...)
1772 {
1773 char tmp[SZ];
1774 int len;
1775 va_list ap;
1776
1777 va_start(ap, fmt);
1778 len = vsnprintf(tmp, SZ, fmt, ap);
1779 buf_write(buf, tmp, len);
1780 va_end(ap);
1781 }
1782
1783 void buf_write(struct buffer *buf, const char *s, int len)
1784 {
1785 if (buf->size - buf->pos < len) {
1786 buf->size += len + SZ;
1787 buf->p = realloc(buf->p, buf->size);
1788 }
1789 strncpy(buf->p + buf->pos, s, len);
1790 buf->pos += len;
1791 }
1792
1793 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1794 {
1795 const char *e = is_vmlinux(m) ?"":".ko";
1796
1797 switch (exp) {
1798 case export_gpl:
1799 fatal("modpost: GPL-incompatible module %s%s "
1800 "uses GPL-only symbol '%s'\n", m, e, s);
1801 break;
1802 case export_unused_gpl:
1803 fatal("modpost: GPL-incompatible module %s%s "
1804 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1805 break;
1806 case export_gpl_future:
1807 warn("modpost: GPL-incompatible module %s%s "
1808 "uses future GPL-only symbol '%s'\n", m, e, s);
1809 break;
1810 case export_plain:
1811 case export_unused:
1812 case export_unknown:
1813 /* ignore */
1814 break;
1815 }
1816 }
1817
1818 static void check_for_unused(enum export exp, const char *m, const char *s)
1819 {
1820 const char *e = is_vmlinux(m) ?"":".ko";
1821
1822 switch (exp) {
1823 case export_unused:
1824 case export_unused_gpl:
1825 warn("modpost: module %s%s "
1826 "uses symbol '%s' marked UNUSED\n", m, e, s);
1827 break;
1828 default:
1829 /* ignore */
1830 break;
1831 }
1832 }
1833
1834 static void check_exports(struct module *mod)
1835 {
1836 struct symbol *s, *exp;
1837
1838 for (s = mod->unres; s; s = s->next) {
1839 const char *basename;
1840 exp = find_symbol(s->name);
1841 if (!exp || exp->module == mod)
1842 continue;
1843 basename = strrchr(mod->name, '/');
1844 if (basename)
1845 basename++;
1846 else
1847 basename = mod->name;
1848 if (!mod->gpl_compatible)
1849 check_for_gpl_usage(exp->export, basename, exp->name);
1850 check_for_unused(exp->export, basename, exp->name);
1851 }
1852 }
1853
1854 /**
1855 * Header for the generated file
1856 **/
1857 static void add_header(struct buffer *b, struct module *mod)
1858 {
1859 buf_printf(b, "#include <linux/module.h>\n");
1860 buf_printf(b, "#include <linux/vermagic.h>\n");
1861 buf_printf(b, "#include <linux/compiler.h>\n");
1862 buf_printf(b, "\n");
1863 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1864 buf_printf(b, "\n");
1865 buf_printf(b, "struct module __this_module\n");
1866 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1867 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
1868 if (mod->has_init)
1869 buf_printf(b, "\t.init = init_module,\n");
1870 if (mod->has_cleanup)
1871 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1872 "\t.exit = cleanup_module,\n"
1873 "#endif\n");
1874 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
1875 buf_printf(b, "};\n");
1876 }
1877
1878 static void add_intree_flag(struct buffer *b, int is_intree)
1879 {
1880 if (is_intree)
1881 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
1882 }
1883
1884 static void add_staging_flag(struct buffer *b, const char *name)
1885 {
1886 static const char *staging_dir = "drivers/staging";
1887
1888 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1889 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1890 }
1891
1892 /**
1893 * Record CRCs for unresolved symbols
1894 **/
1895 static int add_versions(struct buffer *b, struct module *mod)
1896 {
1897 struct symbol *s, *exp;
1898 int err = 0;
1899
1900 for (s = mod->unres; s; s = s->next) {
1901 exp = find_symbol(s->name);
1902 if (!exp || exp->module == mod) {
1903 if (have_vmlinux && !s->weak) {
1904 if (warn_unresolved) {
1905 warn("\"%s\" [%s.ko] undefined!\n",
1906 s->name, mod->name);
1907 } else {
1908 merror("\"%s\" [%s.ko] undefined!\n",
1909 s->name, mod->name);
1910 err = 1;
1911 }
1912 }
1913 continue;
1914 }
1915 s->module = exp->module;
1916 s->crc_valid = exp->crc_valid;
1917 s->crc = exp->crc;
1918 }
1919
1920 if (!modversions)
1921 return err;
1922
1923 buf_printf(b, "\n");
1924 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1925 buf_printf(b, "__used\n");
1926 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1927
1928 for (s = mod->unres; s; s = s->next) {
1929 if (!s->module)
1930 continue;
1931 if (!s->crc_valid) {
1932 warn("\"%s\" [%s.ko] has no CRC!\n",
1933 s->name, mod->name);
1934 continue;
1935 }
1936 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1937 }
1938
1939 buf_printf(b, "};\n");
1940
1941 return err;
1942 }
1943
1944 static void add_depends(struct buffer *b, struct module *mod,
1945 struct module *modules)
1946 {
1947 struct symbol *s;
1948 struct module *m;
1949 int first = 1;
1950
1951 for (m = modules; m; m = m->next)
1952 m->seen = is_vmlinux(m->name);
1953
1954 buf_printf(b, "\n");
1955 buf_printf(b, "static const char __module_depends[]\n");
1956 buf_printf(b, "__used\n");
1957 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1958 buf_printf(b, "\"depends=");
1959 for (s = mod->unres; s; s = s->next) {
1960 const char *p;
1961 if (!s->module)
1962 continue;
1963
1964 if (s->module->seen)
1965 continue;
1966
1967 s->module->seen = 1;
1968 p = strrchr(s->module->name, '/');
1969 if (p)
1970 p++;
1971 else
1972 p = s->module->name;
1973 buf_printf(b, "%s%s", first ? "" : ",", p);
1974 first = 0;
1975 }
1976 buf_printf(b, "\";\n");
1977 }
1978
1979 static void add_srcversion(struct buffer *b, struct module *mod)
1980 {
1981 if (mod->srcversion[0]) {
1982 buf_printf(b, "\n");
1983 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1984 mod->srcversion);
1985 }
1986 }
1987
1988 static void write_if_changed(struct buffer *b, const char *fname)
1989 {
1990 char *tmp;
1991 FILE *file;
1992 struct stat st;
1993
1994 file = fopen(fname, "r");
1995 if (!file)
1996 goto write;
1997
1998 if (fstat(fileno(file), &st) < 0)
1999 goto close_write;
2000
2001 if (st.st_size != b->pos)
2002 goto close_write;
2003
2004 tmp = NOFAIL(malloc(b->pos));
2005 if (fread(tmp, 1, b->pos, file) != b->pos)
2006 goto free_write;
2007
2008 if (memcmp(tmp, b->p, b->pos) != 0)
2009 goto free_write;
2010
2011 free(tmp);
2012 fclose(file);
2013 return;
2014
2015 free_write:
2016 free(tmp);
2017 close_write:
2018 fclose(file);
2019 write:
2020 file = fopen(fname, "w");
2021 if (!file) {
2022 perror(fname);
2023 exit(1);
2024 }
2025 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2026 perror(fname);
2027 exit(1);
2028 }
2029 fclose(file);
2030 }
2031
2032 /* parse Module.symvers file. line format:
2033 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2034 **/
2035 static void read_dump(const char *fname, unsigned int kernel)
2036 {
2037 unsigned long size, pos = 0;
2038 void *file = grab_file(fname, &size);
2039 char *line;
2040
2041 if (!file)
2042 /* No symbol versions, silently ignore */
2043 return;
2044
2045 while ((line = get_next_line(&pos, file, size))) {
2046 char *symname, *modname, *d, *export, *end;
2047 unsigned int crc;
2048 struct module *mod;
2049 struct symbol *s;
2050
2051 if (!(symname = strchr(line, '\t')))
2052 goto fail;
2053 *symname++ = '\0';
2054 if (!(modname = strchr(symname, '\t')))
2055 goto fail;
2056 *modname++ = '\0';
2057 if ((export = strchr(modname, '\t')) != NULL)
2058 *export++ = '\0';
2059 if (export && ((end = strchr(export, '\t')) != NULL))
2060 *end = '\0';
2061 crc = strtoul(line, &d, 16);
2062 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2063 goto fail;
2064 mod = find_module(modname);
2065 if (!mod) {
2066 if (is_vmlinux(modname))
2067 have_vmlinux = 1;
2068 mod = new_module(modname);
2069 mod->skip = 1;
2070 }
2071 s = sym_add_exported(symname, mod, export_no(export));
2072 s->kernel = kernel;
2073 s->preloaded = 1;
2074 sym_update_crc(symname, mod, crc, export_no(export));
2075 }
2076 return;
2077 fail:
2078 fatal("parse error in symbol dump file\n");
2079 }
2080
2081 /* For normal builds always dump all symbols.
2082 * For external modules only dump symbols
2083 * that are not read from kernel Module.symvers.
2084 **/
2085 static int dump_sym(struct symbol *sym)
2086 {
2087 if (!external_module)
2088 return 1;
2089 if (sym->vmlinux || sym->kernel)
2090 return 0;
2091 return 1;
2092 }
2093
2094 static void write_dump(const char *fname)
2095 {
2096 struct buffer buf = { };
2097 struct symbol *symbol;
2098 int n;
2099
2100 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2101 symbol = symbolhash[n];
2102 while (symbol) {
2103 if (dump_sym(symbol))
2104 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2105 symbol->crc, symbol->name,
2106 symbol->module->name,
2107 export_str(symbol->export));
2108 symbol = symbol->next;
2109 }
2110 }
2111 write_if_changed(&buf, fname);
2112 }
2113
2114 struct ext_sym_list {
2115 struct ext_sym_list *next;
2116 const char *file;
2117 };
2118
2119 int main(int argc, char **argv)
2120 {
2121 struct module *mod;
2122 struct buffer buf = { };
2123 char *kernel_read = NULL, *module_read = NULL;
2124 char *dump_write = NULL;
2125 int opt;
2126 int err;
2127 struct ext_sym_list *extsym_iter;
2128 struct ext_sym_list *extsym_start = NULL;
2129
2130 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2131 switch (opt) {
2132 case 'i':
2133 kernel_read = optarg;
2134 break;
2135 case 'I':
2136 module_read = optarg;
2137 external_module = 1;
2138 break;
2139 case 'c':
2140 cross_build = 1;
2141 break;
2142 case 'e':
2143 external_module = 1;
2144 extsym_iter =
2145 NOFAIL(malloc(sizeof(*extsym_iter)));
2146 extsym_iter->next = extsym_start;
2147 extsym_iter->file = optarg;
2148 extsym_start = extsym_iter;
2149 break;
2150 case 'm':
2151 modversions = 1;
2152 break;
2153 case 'o':
2154 dump_write = optarg;
2155 break;
2156 case 'a':
2157 all_versions = 1;
2158 break;
2159 case 's':
2160 vmlinux_section_warnings = 0;
2161 break;
2162 case 'S':
2163 sec_mismatch_verbose = 0;
2164 break;
2165 case 'w':
2166 warn_unresolved = 1;
2167 break;
2168 default:
2169 exit(1);
2170 }
2171 }
2172
2173 if (kernel_read)
2174 read_dump(kernel_read, 1);
2175 if (module_read)
2176 read_dump(module_read, 0);
2177 while (extsym_start) {
2178 read_dump(extsym_start->file, 0);
2179 extsym_iter = extsym_start->next;
2180 free(extsym_start);
2181 extsym_start = extsym_iter;
2182 }
2183
2184 while (optind < argc)
2185 read_symbols(argv[optind++]);
2186
2187 for (mod = modules; mod; mod = mod->next) {
2188 if (mod->skip)
2189 continue;
2190 check_exports(mod);
2191 }
2192
2193 err = 0;
2194
2195 for (mod = modules; mod; mod = mod->next) {
2196 char fname[strlen(mod->name) + 10];
2197
2198 if (mod->skip)
2199 continue;
2200
2201 buf.pos = 0;
2202
2203 add_header(&buf, mod);
2204 add_intree_flag(&buf, !external_module);
2205 add_staging_flag(&buf, mod->name);
2206 err |= add_versions(&buf, mod);
2207 add_depends(&buf, mod, modules);
2208 add_moddevtable(&buf, mod);
2209 add_srcversion(&buf, mod);
2210
2211 sprintf(fname, "%s.mod.c", mod->name);
2212 write_if_changed(&buf, fname);
2213 }
2214
2215 if (dump_write)
2216 write_dump(dump_write);
2217 if (sec_mismatch_count && !sec_mismatch_verbose)
2218 warn("modpost: Found %d section mismatch(es).\n"
2219 "To see full details build your kernel with:\n"
2220 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2221 sec_mismatch_count);
2222
2223 return err;
2224 }
Linux 2.6 libata-dev (mirror)