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V4L/DVB: IR/imon: remove bad ir_input_dev use
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / scripts / mod / modpost.c
blobc827309c29cf727bae89d42a4b6e38164b9d72a7
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
6 * Based in part on module-init-tools/depmod.c,file2alias
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * Usage: modpost vmlinux module1.o module2.o ...
12 */
13
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <ctype.h>
17 #include "modpost.h"
18 #include "../../include/generated/autoconf.h"
19 #include "../../include/linux/license.h"
20
21 /* Some toolchains use a `_' prefix for all user symbols. */
22 #ifdef CONFIG_SYMBOL_PREFIX
23 #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
24 #else
25 #define MODULE_SYMBOL_PREFIX ""
26 #endif
27
28
29 /* Are we using CONFIG_MODVERSIONS? */
30 int modversions = 0;
31 /* Warn about undefined symbols? (do so if we have vmlinux) */
32 int have_vmlinux = 0;
33 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
34 static int all_versions = 0;
35 /* If we are modposting external module set to 1 */
36 static int external_module = 0;
37 /* Warn about section mismatch in vmlinux if set to 1 */
38 static int vmlinux_section_warnings = 1;
39 /* Only warn about unresolved symbols */
40 static int warn_unresolved = 0;
41 /* How a symbol is exported */
42 static int sec_mismatch_count = 0;
43 static int sec_mismatch_verbose = 1;
44
45 enum export {
46 export_plain, export_unused, export_gpl,
47 export_unused_gpl, export_gpl_future, export_unknown
48 };
49
50 #define PRINTF __attribute__ ((format (printf, 1, 2)))
51
52 PRINTF void fatal(const char *fmt, ...)
53 {
54 va_list arglist;
55
56 fprintf(stderr, "FATAL: ");
57
58 va_start(arglist, fmt);
59 vfprintf(stderr, fmt, arglist);
60 va_end(arglist);
61
62 exit(1);
63 }
64
65 PRINTF void warn(const char *fmt, ...)
66 {
67 va_list arglist;
68
69 fprintf(stderr, "WARNING: ");
70
71 va_start(arglist, fmt);
72 vfprintf(stderr, fmt, arglist);
73 va_end(arglist);
74 }
75
76 PRINTF void merror(const char *fmt, ...)
77 {
78 va_list arglist;
79
80 fprintf(stderr, "ERROR: ");
81
82 va_start(arglist, fmt);
83 vfprintf(stderr, fmt, arglist);
84 va_end(arglist);
85 }
86
87 static int is_vmlinux(const char *modname)
88 {
89 const char *myname;
90
91 myname = strrchr(modname, '/');
92 if (myname)
93 myname++;
94 else
95 myname = modname;
96
97 return (strcmp(myname, "vmlinux") == 0) ||
98 (strcmp(myname, "vmlinux.o") == 0);
99 }
100
101 void *do_nofail(void *ptr, const char *expr)
102 {
103 if (!ptr)
104 fatal("modpost: Memory allocation failure: %s.\n", expr);
105
106 return ptr;
107 }
108
109 /* A list of all modules we processed */
110 static struct module *modules;
111
112 static struct module *find_module(char *modname)
113 {
114 struct module *mod;
115
116 for (mod = modules; mod; mod = mod->next)
117 if (strcmp(mod->name, modname) == 0)
118 break;
119 return mod;
120 }
121
122 static struct module *new_module(char *modname)
123 {
124 struct module *mod;
125 char *p, *s;
126
127 mod = NOFAIL(malloc(sizeof(*mod)));
128 memset(mod, 0, sizeof(*mod));
129 p = NOFAIL(strdup(modname));
130
131 /* strip trailing .o */
132 s = strrchr(p, '.');
133 if (s != NULL)
134 if (strcmp(s, ".o") == 0)
135 *s = '\0';
136
137 /* add to list */
138 mod->name = p;
139 mod->gpl_compatible = -1;
140 mod->next = modules;
141 modules = mod;
142
143 return mod;
144 }
145
146 /* A hash of all exported symbols,
147 * struct symbol is also used for lists of unresolved symbols */
148
149 #define SYMBOL_HASH_SIZE 1024
150
151 struct symbol {
152 struct symbol *next;
153 struct module *module;
154 unsigned int crc;
155 int crc_valid;
156 unsigned int weak:1;
157 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
158 unsigned int kernel:1; /* 1 if symbol is from kernel
159 * (only for external modules) **/
160 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
161 enum export export; /* Type of export */
162 char name[0];
163 };
164
165 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
166
167 /* This is based on the hash agorithm from gdbm, via tdb */
168 static inline unsigned int tdb_hash(const char *name)
169 {
170 unsigned value; /* Used to compute the hash value. */
171 unsigned i; /* Used to cycle through random values. */
172
173 /* Set the initial value from the key size. */
174 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
175 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
176
177 return (1103515243 * value + 12345);
178 }
179
180 /**
181 * Allocate a new symbols for use in the hash of exported symbols or
182 * the list of unresolved symbols per module
183 **/
184 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
185 struct symbol *next)
186 {
187 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
188
189 memset(s, 0, sizeof(*s));
190 strcpy(s->name, name);
191 s->weak = weak;
192 s->next = next;
193 return s;
194 }
195
196 /* For the hash of exported symbols */
197 static struct symbol *new_symbol(const char *name, struct module *module,
198 enum export export)
199 {
200 unsigned int hash;
201 struct symbol *new;
202
203 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
204 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
205 new->module = module;
206 new->export = export;
207 return new;
208 }
209
210 static struct symbol *find_symbol(const char *name)
211 {
212 struct symbol *s;
213
214 /* For our purposes, .foo matches foo. PPC64 needs this. */
215 if (name[0] == '.')
216 name++;
217
218 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
219 if (strcmp(s->name, name) == 0)
220 return s;
221 }
222 return NULL;
223 }
224
225 static struct {
226 const char *str;
227 enum export export;
228 } export_list[] = {
229 { .str = "EXPORT_SYMBOL", .export = export_plain },
230 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
231 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
232 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
233 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
234 { .str = "(unknown)", .export = export_unknown },
235 };
236
237
238 static const char *export_str(enum export ex)
239 {
240 return export_list[ex].str;
241 }
242
243 static enum export export_no(const char *s)
244 {
245 int i;
246
247 if (!s)
248 return export_unknown;
249 for (i = 0; export_list[i].export != export_unknown; i++) {
250 if (strcmp(export_list[i].str, s) == 0)
251 return export_list[i].export;
252 }
253 return export_unknown;
254 }
255
256 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
257 {
258 if (sec == elf->export_sec)
259 return export_plain;
260 else if (sec == elf->export_unused_sec)
261 return export_unused;
262 else if (sec == elf->export_gpl_sec)
263 return export_gpl;
264 else if (sec == elf->export_unused_gpl_sec)
265 return export_unused_gpl;
266 else if (sec == elf->export_gpl_future_sec)
267 return export_gpl_future;
268 else
269 return export_unknown;
270 }
271
272 /**
273 * Add an exported symbol - it may have already been added without a
274 * CRC, in this case just update the CRC
275 **/
276 static struct symbol *sym_add_exported(const char *name, struct module *mod,
277 enum export export)
278 {
279 struct symbol *s = find_symbol(name);
280
281 if (!s) {
282 s = new_symbol(name, mod, export);
283 } else {
284 if (!s->preloaded) {
285 warn("%s: '%s' exported twice. Previous export "
286 "was in %s%s\n", mod->name, name,
287 s->module->name,
288 is_vmlinux(s->module->name) ?"":".ko");
289 } else {
290 /* In case Modules.symvers was out of date */
291 s->module = mod;
292 }
293 }
294 s->preloaded = 0;
295 s->vmlinux = is_vmlinux(mod->name);
296 s->kernel = 0;
297 s->export = export;
298 return s;
299 }
300
301 static void sym_update_crc(const char *name, struct module *mod,
302 unsigned int crc, enum export export)
303 {
304 struct symbol *s = find_symbol(name);
305
306 if (!s)
307 s = new_symbol(name, mod, export);
308 s->crc = crc;
309 s->crc_valid = 1;
310 }
311
312 void *grab_file(const char *filename, unsigned long *size)
313 {
314 struct stat st;
315 void *map;
316 int fd;
317
318 fd = open(filename, O_RDONLY);
319 if (fd < 0 || fstat(fd, &st) != 0)
320 return NULL;
321
322 *size = st.st_size;
323 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
324 close(fd);
325
326 if (map == MAP_FAILED)
327 return NULL;
328 return map;
329 }
330
331 /**
332 * Return a copy of the next line in a mmap'ed file.
333 * spaces in the beginning of the line is trimmed away.
334 * Return a pointer to a static buffer.
335 **/
336 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
337 {
338 static char line[4096];
339 int skip = 1;
340 size_t len = 0;
341 signed char *p = (signed char *)file + *pos;
342 char *s = line;
343
344 for (; *pos < size ; (*pos)++) {
345 if (skip && isspace(*p)) {
346 p++;
347 continue;
348 }
349 skip = 0;
350 if (*p != '\n' && (*pos < size)) {
351 len++;
352 *s++ = *p++;
353 if (len > 4095)
354 break; /* Too long, stop */
355 } else {
356 /* End of string */
357 *s = '\0';
358 return line;
359 }
360 }
361 /* End of buffer */
362 return NULL;
363 }
364
365 void release_file(void *file, unsigned long size)
366 {
367 munmap(file, size);
368 }
369
370 static int parse_elf(struct elf_info *info, const char *filename)
371 {
372 unsigned int i;
373 Elf_Ehdr *hdr;
374 Elf_Shdr *sechdrs;
375 Elf_Sym *sym;
376 const char *secstrings;
377 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
378
379 hdr = grab_file(filename, &info->size);
380 if (!hdr) {
381 perror(filename);
382 exit(1);
383 }
384 info->hdr = hdr;
385 if (info->size < sizeof(*hdr)) {
386 /* file too small, assume this is an empty .o file */
387 return 0;
388 }
389 /* Is this a valid ELF file? */
390 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
391 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
392 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
393 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
394 /* Not an ELF file - silently ignore it */
395 return 0;
396 }
397 /* Fix endianness in ELF header */
398 hdr->e_type = TO_NATIVE(hdr->e_type);
399 hdr->e_machine = TO_NATIVE(hdr->e_machine);
400 hdr->e_version = TO_NATIVE(hdr->e_version);
401 hdr->e_entry = TO_NATIVE(hdr->e_entry);
402 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
403 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
404 hdr->e_flags = TO_NATIVE(hdr->e_flags);
405 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
406 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
407 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
408 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
409 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
410 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
411 sechdrs = (void *)hdr + hdr->e_shoff;
412 info->sechdrs = sechdrs;
413
414 /* Check if file offset is correct */
415 if (hdr->e_shoff > info->size) {
416 fatal("section header offset=%lu in file '%s' is bigger than "
417 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
418 filename, info->size);
419 return 0;
420 }
421
422 if (hdr->e_shnum == 0) {
423 /*
424 * There are more than 64k sections,
425 * read count from .sh_size.
426 * note: it doesn't need shndx2secindex()
427 */
428 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
429 }
430 else {
431 info->num_sections = hdr->e_shnum;
432 }
433 if (hdr->e_shstrndx == SHN_XINDEX) {
434 info->secindex_strings =
435 shndx2secindex(TO_NATIVE(sechdrs[0].sh_link));
436 }
437 else {
438 info->secindex_strings = hdr->e_shstrndx;
439 }
440
441 /* Fix endianness in section headers */
442 for (i = 0; i < info->num_sections; i++) {
443 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
444 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
445 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
446 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
447 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
448 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
449 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
450 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
451 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
452 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
453 }
454 /* Find symbol table. */
455 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
456 for (i = 1; i < info->num_sections; i++) {
457 const char *secname;
458 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
459
460 if (!nobits && sechdrs[i].sh_offset > info->size) {
461 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
462 "sizeof(*hrd)=%zu\n", filename,
463 (unsigned long)sechdrs[i].sh_offset,
464 sizeof(*hdr));
465 return 0;
466 }
467 secname = secstrings + sechdrs[i].sh_name;
468 if (strcmp(secname, ".modinfo") == 0) {
469 if (nobits)
470 fatal("%s has NOBITS .modinfo\n", filename);
471 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
472 info->modinfo_len = sechdrs[i].sh_size;
473 } else if (strcmp(secname, "__ksymtab") == 0)
474 info->export_sec = i;
475 else if (strcmp(secname, "__ksymtab_unused") == 0)
476 info->export_unused_sec = i;
477 else if (strcmp(secname, "__ksymtab_gpl") == 0)
478 info->export_gpl_sec = i;
479 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
480 info->export_unused_gpl_sec = i;
481 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
482 info->export_gpl_future_sec = i;
483
484 if (sechdrs[i].sh_type == SHT_SYMTAB) {
485 unsigned int sh_link_idx;
486 symtab_idx = i;
487 info->symtab_start = (void *)hdr +
488 sechdrs[i].sh_offset;
489 info->symtab_stop = (void *)hdr +
490 sechdrs[i].sh_offset + sechdrs[i].sh_size;
491 sh_link_idx = shndx2secindex(sechdrs[i].sh_link);
492 info->strtab = (void *)hdr +
493 sechdrs[sh_link_idx].sh_offset;
494 }
495
496 /* 32bit section no. table? ("more than 64k sections") */
497 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
498 symtab_shndx_idx = i;
499 info->symtab_shndx_start = (void *)hdr +
500 sechdrs[i].sh_offset;
501 info->symtab_shndx_stop = (void *)hdr +
502 sechdrs[i].sh_offset + sechdrs[i].sh_size;
503 }
504 }
505 if (!info->symtab_start)
506 fatal("%s has no symtab?\n", filename);
507
508 /* Fix endianness in symbols */
509 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
510 sym->st_shndx = TO_NATIVE(sym->st_shndx);
511 sym->st_name = TO_NATIVE(sym->st_name);
512 sym->st_value = TO_NATIVE(sym->st_value);
513 sym->st_size = TO_NATIVE(sym->st_size);
514 }
515
516 if (symtab_shndx_idx != ~0U) {
517 Elf32_Word *p;
518 if (symtab_idx !=
519 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link))
520 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
521 filename,
522 shndx2secindex(sechdrs[symtab_shndx_idx].sh_link),
523 symtab_idx);
524 /* Fix endianness */
525 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
526 p++)
527 *p = TO_NATIVE(*p);
528 }
529
530 return 1;
531 }
532
533 static void parse_elf_finish(struct elf_info *info)
534 {
535 release_file(info->hdr, info->size);
536 }
537
538 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
539 {
540 /* ignore __this_module, it will be resolved shortly */
541 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
542 return 1;
543 /* ignore global offset table */
544 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
545 return 1;
546 if (info->hdr->e_machine == EM_PPC)
547 /* Special register function linked on all modules during final link of .ko */
548 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
549 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
550 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
551 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
552 return 1;
553 if (info->hdr->e_machine == EM_PPC64)
554 /* Special register function linked on all modules during final link of .ko */
555 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
556 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
557 return 1;
558 /* Do not ignore this symbol */
559 return 0;
560 }
561
562 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
563 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
564
565 static void handle_modversions(struct module *mod, struct elf_info *info,
566 Elf_Sym *sym, const char *symname)
567 {
568 unsigned int crc;
569 enum export export = export_from_sec(info, get_secindex(info, sym));
570
571 switch (sym->st_shndx) {
572 case SHN_COMMON:
573 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
574 break;
575 case SHN_ABS:
576 /* CRC'd symbol */
577 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
578 crc = (unsigned int) sym->st_value;
579 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
580 export);
581 }
582 break;
583 case SHN_UNDEF:
584 /* undefined symbol */
585 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
586 ELF_ST_BIND(sym->st_info) != STB_WEAK)
587 break;
588 if (ignore_undef_symbol(info, symname))
589 break;
590 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
591 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
592 /* add compatibility with older glibc */
593 #ifndef STT_SPARC_REGISTER
594 #define STT_SPARC_REGISTER STT_REGISTER
595 #endif
596 if (info->hdr->e_machine == EM_SPARC ||
597 info->hdr->e_machine == EM_SPARCV9) {
598 /* Ignore register directives. */
599 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
600 break;
601 if (symname[0] == '.') {
602 char *munged = strdup(symname);
603 munged[0] = '_';
604 munged[1] = toupper(munged[1]);
605 symname = munged;
606 }
607 }
608 #endif
609
610 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
611 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
612 mod->unres =
613 alloc_symbol(symname +
614 strlen(MODULE_SYMBOL_PREFIX),
615 ELF_ST_BIND(sym->st_info) == STB_WEAK,
616 mod->unres);
617 }
618 break;
619 default:
620 /* All exported symbols */
621 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
622 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
623 export);
624 }
625 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
626 mod->has_init = 1;
627 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
628 mod->has_cleanup = 1;
629 break;
630 }
631 }
632
633 /**
634 * Parse tag=value strings from .modinfo section
635 **/
636 static char *next_string(char *string, unsigned long *secsize)
637 {
638 /* Skip non-zero chars */
639 while (string[0]) {
640 string++;
641 if ((*secsize)-- <= 1)
642 return NULL;
643 }
644
645 /* Skip any zero padding. */
646 while (!string[0]) {
647 string++;
648 if ((*secsize)-- <= 1)
649 return NULL;
650 }
651 return string;
652 }
653
654 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
655 const char *tag, char *info)
656 {
657 char *p;
658 unsigned int taglen = strlen(tag);
659 unsigned long size = modinfo_len;
660
661 if (info) {
662 size -= info - (char *)modinfo;
663 modinfo = next_string(info, &size);
664 }
665
666 for (p = modinfo; p; p = next_string(p, &size)) {
667 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
668 return p + taglen + 1;
669 }
670 return NULL;
671 }
672
673 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
674 const char *tag)
675
676 {
677 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
678 }
679
680 /**
681 * Test if string s ends in string sub
682 * return 0 if match
683 **/
684 static int strrcmp(const char *s, const char *sub)
685 {
686 int slen, sublen;
687
688 if (!s || !sub)
689 return 1;
690
691 slen = strlen(s);
692 sublen = strlen(sub);
693
694 if ((slen == 0) || (sublen == 0))
695 return 1;
696
697 if (sublen > slen)
698 return 1;
699
700 return memcmp(s + slen - sublen, sub, sublen);
701 }
702
703 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
704 {
705 if (sym)
706 return elf->strtab + sym->st_name;
707 else
708 return "(unknown)";
709 }
710
711 static const char *sec_name(struct elf_info *elf, int secindex)
712 {
713 Elf_Shdr *sechdrs = elf->sechdrs;
714 return (void *)elf->hdr +
715 elf->sechdrs[elf->secindex_strings].sh_offset +
716 sechdrs[secindex].sh_name;
717 }
718
719 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
720 {
721 return (void *)elf->hdr +
722 elf->sechdrs[elf->secindex_strings].sh_offset +
723 sechdr->sh_name;
724 }
725
726 /* if sym is empty or point to a string
727 * like ".[0-9]+" then return 1.
728 * This is the optional prefix added by ld to some sections
729 */
730 static int number_prefix(const char *sym)
731 {
732 if (*sym++ == '\0')
733 return 1;
734 if (*sym != '.')
735 return 0;
736 do {
737 char c = *sym++;
738 if (c < '0' || c > '9')
739 return 0;
740 } while (*sym);
741 return 1;
742 }
743
744 /* The pattern is an array of simple patterns.
745 * "foo" will match an exact string equal to "foo"
746 * "*foo" will match a string that ends with "foo"
747 * "foo*" will match a string that begins with "foo"
748 * "foo$" will match a string equal to "foo" or "foo.1"
749 * where the '1' can be any number including several digits.
750 * The $ syntax is for sections where ld append a dot number
751 * to make section name unique.
752 */
753 static int match(const char *sym, const char * const pat[])
754 {
755 const char *p;
756 while (*pat) {
757 p = *pat++;
758 const char *endp = p + strlen(p) - 1;
759
760 /* "*foo" */
761 if (*p == '*') {
762 if (strrcmp(sym, p + 1) == 0)
763 return 1;
764 }
765 /* "foo*" */
766 else if (*endp == '*') {
767 if (strncmp(sym, p, strlen(p) - 1) == 0)
768 return 1;
769 }
770 /* "foo$" */
771 else if (*endp == '$') {
772 if (strncmp(sym, p, strlen(p) - 1) == 0) {
773 if (number_prefix(sym + strlen(p) - 1))
774 return 1;
775 }
776 }
777 /* no wildcards */
778 else {
779 if (strcmp(p, sym) == 0)
780 return 1;
781 }
782 }
783 /* no match */
784 return 0;
785 }
786
787 /* sections that we do not want to do full section mismatch check on */
788 static const char *section_white_list[] =
789 {
790 ".comment*",
791 ".debug*",
792 ".mdebug*", /* alpha, score, mips etc. */
793 ".pdr", /* alpha, score, mips etc. */
794 ".stab*",
795 ".note*",
796 ".got*",
797 ".toc*",
798 NULL
799 };
800
801 /*
802 * This is used to find sections missing the SHF_ALLOC flag.
803 * The cause of this is often a section specified in assembler
804 * without "ax" / "aw".
805 */
806 static void check_section(const char *modname, struct elf_info *elf,
807 Elf_Shdr *sechdr)
808 {
809 const char *sec = sech_name(elf, sechdr);
810
811 if (sechdr->sh_type == SHT_PROGBITS &&
812 !(sechdr->sh_flags & SHF_ALLOC) &&
813 !match(sec, section_white_list)) {
814 warn("%s (%s): unexpected non-allocatable section.\n"
815 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
816 "Note that for example <linux/init.h> contains\n"
817 "section definitions for use in .S files.\n\n",
818 modname, sec);
819 }
820 }
821
822
823
824 #define ALL_INIT_DATA_SECTIONS \
825 ".init.setup$", ".init.rodata$", \
826 ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \
827 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
828 #define ALL_EXIT_DATA_SECTIONS \
829 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
830
831 #define ALL_INIT_TEXT_SECTIONS \
832 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
833 #define ALL_EXIT_TEXT_SECTIONS \
834 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
835
836 #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \
837 MEM_INIT_SECTIONS
838 #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \
839 MEM_EXIT_SECTIONS
840
841 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
842 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
843
844 #define DATA_SECTIONS ".data$", ".data.rel$"
845 #define TEXT_SECTIONS ".text$"
846
847 #define INIT_SECTIONS ".init.*"
848 #define DEV_INIT_SECTIONS ".devinit.*"
849 #define CPU_INIT_SECTIONS ".cpuinit.*"
850 #define MEM_INIT_SECTIONS ".meminit.*"
851
852 #define EXIT_SECTIONS ".exit.*"
853 #define DEV_EXIT_SECTIONS ".devexit.*"
854 #define CPU_EXIT_SECTIONS ".cpuexit.*"
855 #define MEM_EXIT_SECTIONS ".memexit.*"
856
857 /* init data sections */
858 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
859
860 /* all init sections */
861 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
862
863 /* All init and exit sections (code + data) */
864 static const char *init_exit_sections[] =
865 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
866
867 /* data section */
868 static const char *data_sections[] = { DATA_SECTIONS, NULL };
869
870
871 /* symbols in .data that may refer to init/exit sections */
872 #define DEFAULT_SYMBOL_WHITE_LIST \
873 "*driver", \
874 "*_template", /* scsi uses *_template a lot */ \
875 "*_timer", /* arm uses ops structures named _timer a lot */ \
876 "*_sht", /* scsi also used *_sht to some extent */ \
877 "*_ops", \
878 "*_probe", \
879 "*_probe_one", \
880 "*_console"
881
882 static const char *head_sections[] = { ".head.text*", NULL };
883 static const char *linker_symbols[] =
884 { "__init_begin", "_sinittext", "_einittext", NULL };
885
886 enum mismatch {
887 TEXT_TO_ANY_INIT,
888 DATA_TO_ANY_INIT,
889 TEXT_TO_ANY_EXIT,
890 DATA_TO_ANY_EXIT,
891 XXXINIT_TO_SOME_INIT,
892 XXXEXIT_TO_SOME_EXIT,
893 ANY_INIT_TO_ANY_EXIT,
894 ANY_EXIT_TO_ANY_INIT,
895 EXPORT_TO_INIT_EXIT,
896 };
897
898 struct sectioncheck {
899 const char *fromsec[20];
900 const char *tosec[20];
901 enum mismatch mismatch;
902 const char *symbol_white_list[20];
903 };
904
905 const struct sectioncheck sectioncheck[] = {
906 /* Do not reference init/exit code/data from
907 * normal code and data
908 */
909 {
910 .fromsec = { TEXT_SECTIONS, NULL },
911 .tosec = { ALL_INIT_SECTIONS, NULL },
912 .mismatch = TEXT_TO_ANY_INIT,
913 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
914 },
915 {
916 .fromsec = { DATA_SECTIONS, NULL },
917 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
918 .mismatch = DATA_TO_ANY_INIT,
919 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
920 },
921 {
922 .fromsec = { DATA_SECTIONS, NULL },
923 .tosec = { INIT_SECTIONS, NULL },
924 .mismatch = DATA_TO_ANY_INIT,
925 .symbol_white_list = {
926 "*_template", "*_timer", "*_sht", "*_ops",
927 "*_probe", "*_probe_one", "*_console", NULL
928 },
929 },
930 {
931 .fromsec = { TEXT_SECTIONS, NULL },
932 .tosec = { ALL_EXIT_SECTIONS, NULL },
933 .mismatch = TEXT_TO_ANY_EXIT,
934 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
935 },
936 {
937 .fromsec = { DATA_SECTIONS, NULL },
938 .tosec = { ALL_EXIT_SECTIONS, NULL },
939 .mismatch = DATA_TO_ANY_EXIT,
940 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
941 },
942 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
943 {
944 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
945 .tosec = { INIT_SECTIONS, NULL },
946 .mismatch = XXXINIT_TO_SOME_INIT,
947 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
948 },
949 /* Do not reference cpuinit code/data from meminit code/data */
950 {
951 .fromsec = { MEM_INIT_SECTIONS, NULL },
952 .tosec = { CPU_INIT_SECTIONS, NULL },
953 .mismatch = XXXINIT_TO_SOME_INIT,
954 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
955 },
956 /* Do not reference meminit code/data from cpuinit code/data */
957 {
958 .fromsec = { CPU_INIT_SECTIONS, NULL },
959 .tosec = { MEM_INIT_SECTIONS, NULL },
960 .mismatch = XXXINIT_TO_SOME_INIT,
961 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
962 },
963 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
964 {
965 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
966 .tosec = { EXIT_SECTIONS, NULL },
967 .mismatch = XXXEXIT_TO_SOME_EXIT,
968 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
969 },
970 /* Do not reference cpuexit code/data from memexit code/data */
971 {
972 .fromsec = { MEM_EXIT_SECTIONS, NULL },
973 .tosec = { CPU_EXIT_SECTIONS, NULL },
974 .mismatch = XXXEXIT_TO_SOME_EXIT,
975 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
976 },
977 /* Do not reference memexit code/data from cpuexit code/data */
978 {
979 .fromsec = { CPU_EXIT_SECTIONS, NULL },
980 .tosec = { MEM_EXIT_SECTIONS, NULL },
981 .mismatch = XXXEXIT_TO_SOME_EXIT,
982 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
983 },
984 /* Do not use exit code/data from init code */
985 {
986 .fromsec = { ALL_INIT_SECTIONS, NULL },
987 .tosec = { ALL_EXIT_SECTIONS, NULL },
988 .mismatch = ANY_INIT_TO_ANY_EXIT,
989 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
990 },
991 /* Do not use init code/data from exit code */
992 {
993 .fromsec = { ALL_EXIT_SECTIONS, NULL },
994 .tosec = { ALL_INIT_SECTIONS, NULL },
995 .mismatch = ANY_EXIT_TO_ANY_INIT,
996 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
997 },
998 /* Do not export init/exit functions or data */
999 {
1000 .fromsec = { "__ksymtab*", NULL },
1001 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1002 .mismatch = EXPORT_TO_INIT_EXIT,
1003 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1004 }
1005 };
1006
1007 static const struct sectioncheck *section_mismatch(
1008 const char *fromsec, const char *tosec)
1009 {
1010 int i;
1011 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1012 const struct sectioncheck *check = &sectioncheck[0];
1013
1014 for (i = 0; i < elems; i++) {
1015 if (match(fromsec, check->fromsec) &&
1016 match(tosec, check->tosec))
1017 return check;
1018 check++;
1019 }
1020 return NULL;
1021 }
1022
1023 /**
1024 * Whitelist to allow certain references to pass with no warning.
1025 *
1026 * Pattern 1:
1027 * If a module parameter is declared __initdata and permissions=0
1028 * then this is legal despite the warning generated.
1029 * We cannot see value of permissions here, so just ignore
1030 * this pattern.
1031 * The pattern is identified by:
1032 * tosec = .init.data
1033 * fromsec = .data*
1034 * atsym =__param*
1035 *
1036 * Pattern 2:
1037 * Many drivers utilise a *driver container with references to
1038 * add, remove, probe functions etc.
1039 * These functions may often be marked __devinit and we do not want to
1040 * warn here.
1041 * the pattern is identified by:
1042 * tosec = init or exit section
1043 * fromsec = data section
1044 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1045 * *probe_one, *_console, *_timer
1046 *
1047 * Pattern 3:
1048 * Whitelist all references from .head.text to any init section
1049 *
1050 * Pattern 4:
1051 * Some symbols belong to init section but still it is ok to reference
1052 * these from non-init sections as these symbols don't have any memory
1053 * allocated for them and symbol address and value are same. So even
1054 * if init section is freed, its ok to reference those symbols.
1055 * For ex. symbols marking the init section boundaries.
1056 * This pattern is identified by
1057 * refsymname = __init_begin, _sinittext, _einittext
1058 *
1059 **/
1060 static int secref_whitelist(const struct sectioncheck *mismatch,
1061 const char *fromsec, const char *fromsym,
1062 const char *tosec, const char *tosym)
1063 {
1064 /* Check for pattern 1 */
1065 if (match(tosec, init_data_sections) &&
1066 match(fromsec, data_sections) &&
1067 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1068 return 0;
1069
1070 /* Check for pattern 2 */
1071 if (match(tosec, init_exit_sections) &&
1072 match(fromsec, data_sections) &&
1073 match(fromsym, mismatch->symbol_white_list))
1074 return 0;
1075
1076 /* Check for pattern 3 */
1077 if (match(fromsec, head_sections) &&
1078 match(tosec, init_sections))
1079 return 0;
1080
1081 /* Check for pattern 4 */
1082 if (match(tosym, linker_symbols))
1083 return 0;
1084
1085 return 1;
1086 }
1087
1088 /**
1089 * Find symbol based on relocation record info.
1090 * In some cases the symbol supplied is a valid symbol so
1091 * return refsym. If st_name != 0 we assume this is a valid symbol.
1092 * In other cases the symbol needs to be looked up in the symbol table
1093 * based on section and address.
1094 * **/
1095 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1096 Elf_Sym *relsym)
1097 {
1098 Elf_Sym *sym;
1099 Elf_Sym *near = NULL;
1100 Elf64_Sword distance = 20;
1101 Elf64_Sword d;
1102 unsigned int relsym_secindex;
1103
1104 if (relsym->st_name != 0)
1105 return relsym;
1106
1107 relsym_secindex = get_secindex(elf, relsym);
1108 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1109 if (get_secindex(elf, sym) != relsym_secindex)
1110 continue;
1111 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1112 continue;
1113 if (sym->st_value == addr)
1114 return sym;
1115 /* Find a symbol nearby - addr are maybe negative */
1116 d = sym->st_value - addr;
1117 if (d < 0)
1118 d = addr - sym->st_value;
1119 if (d < distance) {
1120 distance = d;
1121 near = sym;
1122 }
1123 }
1124 /* We need a close match */
1125 if (distance < 20)
1126 return near;
1127 else
1128 return NULL;
1129 }
1130
1131 static inline int is_arm_mapping_symbol(const char *str)
1132 {
1133 return str[0] == '$' && strchr("atd", str[1])
1134 && (str[2] == '\0' || str[2] == '.');
1135 }
1136
1137 /*
1138 * If there's no name there, ignore it; likewise, ignore it if it's
1139 * one of the magic symbols emitted used by current ARM tools.
1140 *
1141 * Otherwise if find_symbols_between() returns those symbols, they'll
1142 * fail the whitelist tests and cause lots of false alarms ... fixable
1143 * only by merging __exit and __init sections into __text, bloating
1144 * the kernel (which is especially evil on embedded platforms).
1145 */
1146 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1147 {
1148 const char *name = elf->strtab + sym->st_name;
1149
1150 if (!name || !strlen(name))
1151 return 0;
1152 return !is_arm_mapping_symbol(name);
1153 }
1154
1155 /*
1156 * Find symbols before or equal addr and after addr - in the section sec.
1157 * If we find two symbols with equal offset prefer one with a valid name.
1158 * The ELF format may have a better way to detect what type of symbol
1159 * it is, but this works for now.
1160 **/
1161 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1162 const char *sec)
1163 {
1164 Elf_Sym *sym;
1165 Elf_Sym *near = NULL;
1166 Elf_Addr distance = ~0;
1167
1168 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1169 const char *symsec;
1170
1171 if (is_shndx_special(sym->st_shndx))
1172 continue;
1173 symsec = sec_name(elf, get_secindex(elf, sym));
1174 if (strcmp(symsec, sec) != 0)
1175 continue;
1176 if (!is_valid_name(elf, sym))
1177 continue;
1178 if (sym->st_value <= addr) {
1179 if ((addr - sym->st_value) < distance) {
1180 distance = addr - sym->st_value;
1181 near = sym;
1182 } else if ((addr - sym->st_value) == distance) {
1183 near = sym;
1184 }
1185 }
1186 }
1187 return near;
1188 }
1189
1190 /*
1191 * Convert a section name to the function/data attribute
1192 * .init.text => __init
1193 * .cpuinit.data => __cpudata
1194 * .memexitconst => __memconst
1195 * etc.
1196 */
1197 static char *sec2annotation(const char *s)
1198 {
1199 if (match(s, init_exit_sections)) {
1200 char *p = malloc(20);
1201 char *r = p;
1202
1203 *p++ = '_';
1204 *p++ = '_';
1205 if (*s == '.')
1206 s++;
1207 while (*s && *s != '.')
1208 *p++ = *s++;
1209 *p = '\0';
1210 if (*s == '.')
1211 s++;
1212 if (strstr(s, "rodata") != NULL)
1213 strcat(p, "const ");
1214 else if (strstr(s, "data") != NULL)
1215 strcat(p, "data ");
1216 else
1217 strcat(p, " ");
1218 return r; /* we leak her but we do not care */
1219 } else {
1220 return "";
1221 }
1222 }
1223
1224 static int is_function(Elf_Sym *sym)
1225 {
1226 if (sym)
1227 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1228 else
1229 return -1;
1230 }
1231
1232 /*
1233 * Print a warning about a section mismatch.
1234 * Try to find symbols near it so user can find it.
1235 * Check whitelist before warning - it may be a false positive.
1236 */
1237 static void report_sec_mismatch(const char *modname,
1238 const struct sectioncheck *mismatch,
1239 const char *fromsec,
1240 unsigned long long fromaddr,
1241 const char *fromsym,
1242 int from_is_func,
1243 const char *tosec, const char *tosym,
1244 int to_is_func)
1245 {
1246 const char *from, *from_p;
1247 const char *to, *to_p;
1248
1249 switch (from_is_func) {
1250 case 0: from = "variable"; from_p = ""; break;
1251 case 1: from = "function"; from_p = "()"; break;
1252 default: from = "(unknown reference)"; from_p = ""; break;
1253 }
1254 switch (to_is_func) {
1255 case 0: to = "variable"; to_p = ""; break;
1256 case 1: to = "function"; to_p = "()"; break;
1257 default: to = "(unknown reference)"; to_p = ""; break;
1258 }
1259
1260 sec_mismatch_count++;
1261 if (!sec_mismatch_verbose)
1262 return;
1263
1264 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1265 "to the %s %s:%s%s\n",
1266 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1267 tosym, to_p);
1268
1269 switch (mismatch->mismatch) {
1270 case TEXT_TO_ANY_INIT:
1271 fprintf(stderr,
1272 "The function %s%s() references\n"
1273 "the %s %s%s%s.\n"
1274 "This is often because %s lacks a %s\n"
1275 "annotation or the annotation of %s is wrong.\n",
1276 sec2annotation(fromsec), fromsym,
1277 to, sec2annotation(tosec), tosym, to_p,
1278 fromsym, sec2annotation(tosec), tosym);
1279 break;
1280 case DATA_TO_ANY_INIT: {
1281 const char *const *s = mismatch->symbol_white_list;
1282 fprintf(stderr,
1283 "The variable %s references\n"
1284 "the %s %s%s%s\n"
1285 "If the reference is valid then annotate the\n"
1286 "variable with __init* or __refdata (see linux/init.h) "
1287 "or name the variable:\n",
1288 fromsym, to, sec2annotation(tosec), tosym, to_p);
1289 while (*s)
1290 fprintf(stderr, "%s, ", *s++);
1291 fprintf(stderr, "\n");
1292 break;
1293 }
1294 case TEXT_TO_ANY_EXIT:
1295 fprintf(stderr,
1296 "The function %s() references a %s in an exit section.\n"
1297 "Often the %s %s%s has valid usage outside the exit section\n"
1298 "and the fix is to remove the %sannotation of %s.\n",
1299 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
1300 break;
1301 case DATA_TO_ANY_EXIT: {
1302 const char *const *s = mismatch->symbol_white_list;
1303 fprintf(stderr,
1304 "The variable %s references\n"
1305 "the %s %s%s%s\n"
1306 "If the reference is valid then annotate the\n"
1307 "variable with __exit* (see linux/init.h) or "
1308 "name the variable:\n",
1309 fromsym, to, sec2annotation(tosec), tosym, to_p);
1310 while (*s)
1311 fprintf(stderr, "%s, ", *s++);
1312 fprintf(stderr, "\n");
1313 break;
1314 }
1315 case XXXINIT_TO_SOME_INIT:
1316 case XXXEXIT_TO_SOME_EXIT:
1317 fprintf(stderr,
1318 "The %s %s%s%s references\n"
1319 "a %s %s%s%s.\n"
1320 "If %s is only used by %s then\n"
1321 "annotate %s with a matching annotation.\n",
1322 from, sec2annotation(fromsec), fromsym, from_p,
1323 to, sec2annotation(tosec), tosym, to_p,
1324 tosym, fromsym, tosym);
1325 break;
1326 case ANY_INIT_TO_ANY_EXIT:
1327 fprintf(stderr,
1328 "The %s %s%s%s references\n"
1329 "a %s %s%s%s.\n"
1330 "This is often seen when error handling "
1331 "in the init function\n"
1332 "uses functionality in the exit path.\n"
1333 "The fix is often to remove the %sannotation of\n"
1334 "%s%s so it may be used outside an exit section.\n",
1335 from, sec2annotation(fromsec), fromsym, from_p,
1336 to, sec2annotation(tosec), tosym, to_p,
1337 sec2annotation(tosec), tosym, to_p);
1338 break;
1339 case ANY_EXIT_TO_ANY_INIT:
1340 fprintf(stderr,
1341 "The %s %s%s%s references\n"
1342 "a %s %s%s%s.\n"
1343 "This is often seen when error handling "
1344 "in the exit function\n"
1345 "uses functionality in the init path.\n"
1346 "The fix is often to remove the %sannotation of\n"
1347 "%s%s so it may be used outside an init section.\n",
1348 from, sec2annotation(fromsec), fromsym, from_p,
1349 to, sec2annotation(tosec), tosym, to_p,
1350 sec2annotation(tosec), tosym, to_p);
1351 break;
1352 case EXPORT_TO_INIT_EXIT:
1353 fprintf(stderr,
1354 "The symbol %s is exported and annotated %s\n"
1355 "Fix this by removing the %sannotation of %s "
1356 "or drop the export.\n",
1357 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
1358 break;
1359 }
1360 fprintf(stderr, "\n");
1361 }
1362
1363 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1364 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1365 {
1366 const char *tosec;
1367 const struct sectioncheck *mismatch;
1368
1369 tosec = sec_name(elf, get_secindex(elf, sym));
1370 mismatch = section_mismatch(fromsec, tosec);
1371 if (mismatch) {
1372 Elf_Sym *to;
1373 Elf_Sym *from;
1374 const char *tosym;
1375 const char *fromsym;
1376
1377 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1378 fromsym = sym_name(elf, from);
1379 to = find_elf_symbol(elf, r->r_addend, sym);
1380 tosym = sym_name(elf, to);
1381
1382 /* check whitelist - we may ignore it */
1383 if (secref_whitelist(mismatch,
1384 fromsec, fromsym, tosec, tosym)) {
1385 report_sec_mismatch(modname, mismatch,
1386 fromsec, r->r_offset, fromsym,
1387 is_function(from), tosec, tosym,
1388 is_function(to));
1389 }
1390 }
1391 }
1392
1393 static unsigned int *reloc_location(struct elf_info *elf,
1394 Elf_Shdr *sechdr, Elf_Rela *r)
1395 {
1396 Elf_Shdr *sechdrs = elf->sechdrs;
1397 int section = shndx2secindex(sechdr->sh_info);
1398
1399 return (void *)elf->hdr + sechdrs[section].sh_offset +
1400 r->r_offset - sechdrs[section].sh_addr;
1401 }
1402
1403 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1404 {
1405 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1406 unsigned int *location = reloc_location(elf, sechdr, r);
1407
1408 switch (r_typ) {
1409 case R_386_32:
1410 r->r_addend = TO_NATIVE(*location);
1411 break;
1412 case R_386_PC32:
1413 r->r_addend = TO_NATIVE(*location) + 4;
1414 /* For CONFIG_RELOCATABLE=y */
1415 if (elf->hdr->e_type == ET_EXEC)
1416 r->r_addend += r->r_offset;
1417 break;
1418 }
1419 return 0;
1420 }
1421
1422 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1423 {
1424 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1425
1426 switch (r_typ) {
1427 case R_ARM_ABS32:
1428 /* From ARM ABI: (S + A) | T */
1429 r->r_addend = (int)(long)
1430 (elf->symtab_start + ELF_R_SYM(r->r_info));
1431 break;
1432 case R_ARM_PC24:
1433 /* From ARM ABI: ((S + A) | T) - P */
1434 r->r_addend = (int)(long)(elf->hdr +
1435 sechdr->sh_offset +
1436 (r->r_offset - sechdr->sh_addr));
1437 break;
1438 default:
1439 return 1;
1440 }
1441 return 0;
1442 }
1443
1444 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1445 {
1446 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1447 unsigned int *location = reloc_location(elf, sechdr, r);
1448 unsigned int inst;
1449
1450 if (r_typ == R_MIPS_HI16)
1451 return 1; /* skip this */
1452 inst = TO_NATIVE(*location);
1453 switch (r_typ) {
1454 case R_MIPS_LO16:
1455 r->r_addend = inst & 0xffff;
1456 break;
1457 case R_MIPS_26:
1458 r->r_addend = (inst & 0x03ffffff) << 2;
1459 break;
1460 case R_MIPS_32:
1461 r->r_addend = inst;
1462 break;
1463 }
1464 return 0;
1465 }
1466
1467 static void section_rela(const char *modname, struct elf_info *elf,
1468 Elf_Shdr *sechdr)
1469 {
1470 Elf_Sym *sym;
1471 Elf_Rela *rela;
1472 Elf_Rela r;
1473 unsigned int r_sym;
1474 const char *fromsec;
1475
1476 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1477 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1478
1479 fromsec = sech_name(elf, sechdr);
1480 fromsec += strlen(".rela");
1481 /* if from section (name) is know good then skip it */
1482 if (match(fromsec, section_white_list))
1483 return;
1484
1485 for (rela = start; rela < stop; rela++) {
1486 r.r_offset = TO_NATIVE(rela->r_offset);
1487 #if KERNEL_ELFCLASS == ELFCLASS64
1488 if (elf->hdr->e_machine == EM_MIPS) {
1489 unsigned int r_typ;
1490 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1491 r_sym = TO_NATIVE(r_sym);
1492 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1493 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1494 } else {
1495 r.r_info = TO_NATIVE(rela->r_info);
1496 r_sym = ELF_R_SYM(r.r_info);
1497 }
1498 #else
1499 r.r_info = TO_NATIVE(rela->r_info);
1500 r_sym = ELF_R_SYM(r.r_info);
1501 #endif
1502 r.r_addend = TO_NATIVE(rela->r_addend);
1503 sym = elf->symtab_start + r_sym;
1504 /* Skip special sections */
1505 if (is_shndx_special(sym->st_shndx))
1506 continue;
1507 check_section_mismatch(modname, elf, &r, sym, fromsec);
1508 }
1509 }
1510
1511 static void section_rel(const char *modname, struct elf_info *elf,
1512 Elf_Shdr *sechdr)
1513 {
1514 Elf_Sym *sym;
1515 Elf_Rel *rel;
1516 Elf_Rela r;
1517 unsigned int r_sym;
1518 const char *fromsec;
1519
1520 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1521 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1522
1523 fromsec = sech_name(elf, sechdr);
1524 fromsec += strlen(".rel");
1525 /* if from section (name) is know good then skip it */
1526 if (match(fromsec, section_white_list))
1527 return;
1528
1529 for (rel = start; rel < stop; rel++) {
1530 r.r_offset = TO_NATIVE(rel->r_offset);
1531 #if KERNEL_ELFCLASS == ELFCLASS64
1532 if (elf->hdr->e_machine == EM_MIPS) {
1533 unsigned int r_typ;
1534 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1535 r_sym = TO_NATIVE(r_sym);
1536 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1537 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1538 } else {
1539 r.r_info = TO_NATIVE(rel->r_info);
1540 r_sym = ELF_R_SYM(r.r_info);
1541 }
1542 #else
1543 r.r_info = TO_NATIVE(rel->r_info);
1544 r_sym = ELF_R_SYM(r.r_info);
1545 #endif
1546 r.r_addend = 0;
1547 switch (elf->hdr->e_machine) {
1548 case EM_386:
1549 if (addend_386_rel(elf, sechdr, &r))
1550 continue;
1551 break;
1552 case EM_ARM:
1553 if (addend_arm_rel(elf, sechdr, &r))
1554 continue;
1555 break;
1556 case EM_MIPS:
1557 if (addend_mips_rel(elf, sechdr, &r))
1558 continue;
1559 break;
1560 }
1561 sym = elf->symtab_start + r_sym;
1562 /* Skip special sections */
1563 if (is_shndx_special(sym->st_shndx))
1564 continue;
1565 check_section_mismatch(modname, elf, &r, sym, fromsec);
1566 }
1567 }
1568
1569 /**
1570 * A module includes a number of sections that are discarded
1571 * either when loaded or when used as built-in.
1572 * For loaded modules all functions marked __init and all data
1573 * marked __initdata will be discarded when the module has been intialized.
1574 * Likewise for modules used built-in the sections marked __exit
1575 * are discarded because __exit marked function are supposed to be called
1576 * only when a module is unloaded which never happens for built-in modules.
1577 * The check_sec_ref() function traverses all relocation records
1578 * to find all references to a section that reference a section that will
1579 * be discarded and warns about it.
1580 **/
1581 static void check_sec_ref(struct module *mod, const char *modname,
1582 struct elf_info *elf)
1583 {
1584 int i;
1585 Elf_Shdr *sechdrs = elf->sechdrs;
1586
1587 /* Walk through all sections */
1588 for (i = 0; i < elf->num_sections; i++) {
1589 check_section(modname, elf, &elf->sechdrs[i]);
1590 /* We want to process only relocation sections and not .init */
1591 if (sechdrs[i].sh_type == SHT_RELA)
1592 section_rela(modname, elf, &elf->sechdrs[i]);
1593 else if (sechdrs[i].sh_type == SHT_REL)
1594 section_rel(modname, elf, &elf->sechdrs[i]);
1595 }
1596 }
1597
1598 static void read_symbols(char *modname)
1599 {
1600 const char *symname;
1601 char *version;
1602 char *license;
1603 struct module *mod;
1604 struct elf_info info = { };
1605 Elf_Sym *sym;
1606
1607 if (!parse_elf(&info, modname))
1608 return;
1609
1610 mod = new_module(modname);
1611
1612 /* When there's no vmlinux, don't print warnings about
1613 * unresolved symbols (since there'll be too many ;) */
1614 if (is_vmlinux(modname)) {
1615 have_vmlinux = 1;
1616 mod->skip = 1;
1617 }
1618
1619 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1620 if (info.modinfo && !license && !is_vmlinux(modname))
1621 warn("modpost: missing MODULE_LICENSE() in %s\n"
1622 "see include/linux/module.h for "
1623 "more information\n", modname);
1624 while (license) {
1625 if (license_is_gpl_compatible(license))
1626 mod->gpl_compatible = 1;
1627 else {
1628 mod->gpl_compatible = 0;
1629 break;
1630 }
1631 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1632 "license", license);
1633 }
1634
1635 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1636 symname = info.strtab + sym->st_name;
1637
1638 handle_modversions(mod, &info, sym, symname);
1639 handle_moddevtable(mod, &info, sym, symname);
1640 }
1641 if (!is_vmlinux(modname) ||
1642 (is_vmlinux(modname) && vmlinux_section_warnings))
1643 check_sec_ref(mod, modname, &info);
1644
1645 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1646 if (version)
1647 maybe_frob_rcs_version(modname, version, info.modinfo,
1648 version - (char *)info.hdr);
1649 if (version || (all_versions && !is_vmlinux(modname)))
1650 get_src_version(modname, mod->srcversion,
1651 sizeof(mod->srcversion)-1);
1652
1653 parse_elf_finish(&info);
1654
1655 /* Our trick to get versioning for module struct etc. - it's
1656 * never passed as an argument to an exported function, so
1657 * the automatic versioning doesn't pick it up, but it's really
1658 * important anyhow */
1659 if (modversions)
1660 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1661 }
1662
1663 #define SZ 500
1664
1665 /* We first write the generated file into memory using the
1666 * following helper, then compare to the file on disk and
1667 * only update the later if anything changed */
1668
1669 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1670 const char *fmt, ...)
1671 {
1672 char tmp[SZ];
1673 int len;
1674 va_list ap;
1675
1676 va_start(ap, fmt);
1677 len = vsnprintf(tmp, SZ, fmt, ap);
1678 buf_write(buf, tmp, len);
1679 va_end(ap);
1680 }
1681
1682 void buf_write(struct buffer *buf, const char *s, int len)
1683 {
1684 if (buf->size - buf->pos < len) {
1685 buf->size += len + SZ;
1686 buf->p = realloc(buf->p, buf->size);
1687 }
1688 strncpy(buf->p + buf->pos, s, len);
1689 buf->pos += len;
1690 }
1691
1692 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1693 {
1694 const char *e = is_vmlinux(m) ?"":".ko";
1695
1696 switch (exp) {
1697 case export_gpl:
1698 fatal("modpost: GPL-incompatible module %s%s "
1699 "uses GPL-only symbol '%s'\n", m, e, s);
1700 break;
1701 case export_unused_gpl:
1702 fatal("modpost: GPL-incompatible module %s%s "
1703 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1704 break;
1705 case export_gpl_future:
1706 warn("modpost: GPL-incompatible module %s%s "
1707 "uses future GPL-only symbol '%s'\n", m, e, s);
1708 break;
1709 case export_plain:
1710 case export_unused:
1711 case export_unknown:
1712 /* ignore */
1713 break;
1714 }
1715 }
1716
1717 static void check_for_unused(enum export exp, const char *m, const char *s)
1718 {
1719 const char *e = is_vmlinux(m) ?"":".ko";
1720
1721 switch (exp) {
1722 case export_unused:
1723 case export_unused_gpl:
1724 warn("modpost: module %s%s "
1725 "uses symbol '%s' marked UNUSED\n", m, e, s);
1726 break;
1727 default:
1728 /* ignore */
1729 break;
1730 }
1731 }
1732
1733 static void check_exports(struct module *mod)
1734 {
1735 struct symbol *s, *exp;
1736
1737 for (s = mod->unres; s; s = s->next) {
1738 const char *basename;
1739 exp = find_symbol(s->name);
1740 if (!exp || exp->module == mod)
1741 continue;
1742 basename = strrchr(mod->name, '/');
1743 if (basename)
1744 basename++;
1745 else
1746 basename = mod->name;
1747 if (!mod->gpl_compatible)
1748 check_for_gpl_usage(exp->export, basename, exp->name);
1749 check_for_unused(exp->export, basename, exp->name);
1750 }
1751 }
1752
1753 /**
1754 * Header for the generated file
1755 **/
1756 static void add_header(struct buffer *b, struct module *mod)
1757 {
1758 buf_printf(b, "#include <linux/module.h>\n");
1759 buf_printf(b, "#include <linux/vermagic.h>\n");
1760 buf_printf(b, "#include <linux/compiler.h>\n");
1761 buf_printf(b, "\n");
1762 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1763 buf_printf(b, "\n");
1764 buf_printf(b, "struct module __this_module\n");
1765 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1766 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1767 if (mod->has_init)
1768 buf_printf(b, " .init = init_module,\n");
1769 if (mod->has_cleanup)
1770 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1771 " .exit = cleanup_module,\n"
1772 "#endif\n");
1773 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1774 buf_printf(b, "};\n");
1775 }
1776
1777 static void add_staging_flag(struct buffer *b, const char *name)
1778 {
1779 static const char *staging_dir = "drivers/staging";
1780
1781 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1782 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1783 }
1784
1785 /**
1786 * Record CRCs for unresolved symbols
1787 **/
1788 static int add_versions(struct buffer *b, struct module *mod)
1789 {
1790 struct symbol *s, *exp;
1791 int err = 0;
1792
1793 for (s = mod->unres; s; s = s->next) {
1794 exp = find_symbol(s->name);
1795 if (!exp || exp->module == mod) {
1796 if (have_vmlinux && !s->weak) {
1797 if (warn_unresolved) {
1798 warn("\"%s\" [%s.ko] undefined!\n",
1799 s->name, mod->name);
1800 } else {
1801 merror("\"%s\" [%s.ko] undefined!\n",
1802 s->name, mod->name);
1803 err = 1;
1804 }
1805 }
1806 continue;
1807 }
1808 s->module = exp->module;
1809 s->crc_valid = exp->crc_valid;
1810 s->crc = exp->crc;
1811 }
1812
1813 if (!modversions)
1814 return err;
1815
1816 buf_printf(b, "\n");
1817 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1818 buf_printf(b, "__used\n");
1819 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1820
1821 for (s = mod->unres; s; s = s->next) {
1822 if (!s->module)
1823 continue;
1824 if (!s->crc_valid) {
1825 warn("\"%s\" [%s.ko] has no CRC!\n",
1826 s->name, mod->name);
1827 continue;
1828 }
1829 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1830 }
1831
1832 buf_printf(b, "};\n");
1833
1834 return err;
1835 }
1836
1837 static void add_depends(struct buffer *b, struct module *mod,
1838 struct module *modules)
1839 {
1840 struct symbol *s;
1841 struct module *m;
1842 int first = 1;
1843
1844 for (m = modules; m; m = m->next)
1845 m->seen = is_vmlinux(m->name);
1846
1847 buf_printf(b, "\n");
1848 buf_printf(b, "static const char __module_depends[]\n");
1849 buf_printf(b, "__used\n");
1850 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1851 buf_printf(b, "\"depends=");
1852 for (s = mod->unres; s; s = s->next) {
1853 const char *p;
1854 if (!s->module)
1855 continue;
1856
1857 if (s->module->seen)
1858 continue;
1859
1860 s->module->seen = 1;
1861 p = strrchr(s->module->name, '/');
1862 if (p)
1863 p++;
1864 else
1865 p = s->module->name;
1866 buf_printf(b, "%s%s", first ? "" : ",", p);
1867 first = 0;
1868 }
1869 buf_printf(b, "\";\n");
1870 }
1871
1872 static void add_srcversion(struct buffer *b, struct module *mod)
1873 {
1874 if (mod->srcversion[0]) {
1875 buf_printf(b, "\n");
1876 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1877 mod->srcversion);
1878 }
1879 }
1880
1881 static void write_if_changed(struct buffer *b, const char *fname)
1882 {
1883 char *tmp;
1884 FILE *file;
1885 struct stat st;
1886
1887 file = fopen(fname, "r");
1888 if (!file)
1889 goto write;
1890
1891 if (fstat(fileno(file), &st) < 0)
1892 goto close_write;
1893
1894 if (st.st_size != b->pos)
1895 goto close_write;
1896
1897 tmp = NOFAIL(malloc(b->pos));
1898 if (fread(tmp, 1, b->pos, file) != b->pos)
1899 goto free_write;
1900
1901 if (memcmp(tmp, b->p, b->pos) != 0)
1902 goto free_write;
1903
1904 free(tmp);
1905 fclose(file);
1906 return;
1907
1908 free_write:
1909 free(tmp);
1910 close_write:
1911 fclose(file);
1912 write:
1913 file = fopen(fname, "w");
1914 if (!file) {
1915 perror(fname);
1916 exit(1);
1917 }
1918 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1919 perror(fname);
1920 exit(1);
1921 }
1922 fclose(file);
1923 }
1924
1925 /* parse Module.symvers file. line format:
1926 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1927 **/
1928 static void read_dump(const char *fname, unsigned int kernel)
1929 {
1930 unsigned long size, pos = 0;
1931 void *file = grab_file(fname, &size);
1932 char *line;
1933
1934 if (!file)
1935 /* No symbol versions, silently ignore */
1936 return;
1937
1938 while ((line = get_next_line(&pos, file, size))) {
1939 char *symname, *modname, *d, *export, *end;
1940 unsigned int crc;
1941 struct module *mod;
1942 struct symbol *s;
1943
1944 if (!(symname = strchr(line, '\t')))
1945 goto fail;
1946 *symname++ = '\0';
1947 if (!(modname = strchr(symname, '\t')))
1948 goto fail;
1949 *modname++ = '\0';
1950 if ((export = strchr(modname, '\t')) != NULL)
1951 *export++ = '\0';
1952 if (export && ((end = strchr(export, '\t')) != NULL))
1953 *end = '\0';
1954 crc = strtoul(line, &d, 16);
1955 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1956 goto fail;
1957 mod = find_module(modname);
1958 if (!mod) {
1959 if (is_vmlinux(modname))
1960 have_vmlinux = 1;
1961 mod = new_module(modname);
1962 mod->skip = 1;
1963 }
1964 s = sym_add_exported(symname, mod, export_no(export));
1965 s->kernel = kernel;
1966 s->preloaded = 1;
1967 sym_update_crc(symname, mod, crc, export_no(export));
1968 }
1969 return;
1970 fail:
1971 fatal("parse error in symbol dump file\n");
1972 }
1973
1974 /* For normal builds always dump all symbols.
1975 * For external modules only dump symbols
1976 * that are not read from kernel Module.symvers.
1977 **/
1978 static int dump_sym(struct symbol *sym)
1979 {
1980 if (!external_module)
1981 return 1;
1982 if (sym->vmlinux || sym->kernel)
1983 return 0;
1984 return 1;
1985 }
1986
1987 static void write_dump(const char *fname)
1988 {
1989 struct buffer buf = { };
1990 struct symbol *symbol;
1991 int n;
1992
1993 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1994 symbol = symbolhash[n];
1995 while (symbol) {
1996 if (dump_sym(symbol))
1997 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1998 symbol->crc, symbol->name,
1999 symbol->module->name,
2000 export_str(symbol->export));
2001 symbol = symbol->next;
2002 }
2003 }
2004 write_if_changed(&buf, fname);
2005 }
2006
2007 struct ext_sym_list {
2008 struct ext_sym_list *next;
2009 const char *file;
2010 };
2011
2012 int main(int argc, char **argv)
2013 {
2014 struct module *mod;
2015 struct buffer buf = { };
2016 char *kernel_read = NULL, *module_read = NULL;
2017 char *dump_write = NULL;
2018 int opt;
2019 int err;
2020 struct ext_sym_list *extsym_iter;
2021 struct ext_sym_list *extsym_start = NULL;
2022
2023 while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) {
2024 switch (opt) {
2025 case 'i':
2026 kernel_read = optarg;
2027 break;
2028 case 'I':
2029 module_read = optarg;
2030 external_module = 1;
2031 break;
2032 case 'c':
2033 cross_build = 1;
2034 break;
2035 case 'e':
2036 external_module = 1;
2037 extsym_iter =
2038 NOFAIL(malloc(sizeof(*extsym_iter)));
2039 extsym_iter->next = extsym_start;
2040 extsym_iter->file = optarg;
2041 extsym_start = extsym_iter;
2042 break;
2043 case 'm':
2044 modversions = 1;
2045 break;
2046 case 'o':
2047 dump_write = optarg;
2048 break;
2049 case 'a':
2050 all_versions = 1;
2051 break;
2052 case 's':
2053 vmlinux_section_warnings = 0;
2054 break;
2055 case 'S':
2056 sec_mismatch_verbose = 0;
2057 break;
2058 case 'w':
2059 warn_unresolved = 1;
2060 break;
2061 default:
2062 exit(1);
2063 }
2064 }
2065
2066 if (kernel_read)
2067 read_dump(kernel_read, 1);
2068 if (module_read)
2069 read_dump(module_read, 0);
2070 while (extsym_start) {
2071 read_dump(extsym_start->file, 0);
2072 extsym_iter = extsym_start->next;
2073 free(extsym_start);
2074 extsym_start = extsym_iter;
2075 }
2076
2077 while (optind < argc)
2078 read_symbols(argv[optind++]);
2079
2080 for (mod = modules; mod; mod = mod->next) {
2081 if (mod->skip)
2082 continue;
2083 check_exports(mod);
2084 }
2085
2086 err = 0;
2087
2088 for (mod = modules; mod; mod = mod->next) {
2089 char fname[strlen(mod->name) + 10];
2090
2091 if (mod->skip)
2092 continue;
2093
2094 buf.pos = 0;
2095
2096 add_header(&buf, mod);
2097 add_staging_flag(&buf, mod->name);
2098 err |= add_versions(&buf, mod);
2099 add_depends(&buf, mod, modules);
2100 add_moddevtable(&buf, mod);
2101 add_srcversion(&buf, mod);
2102
2103 sprintf(fname, "%s.mod.c", mod->name);
2104 write_if_changed(&buf, fname);
2105 }
2106
2107 if (dump_write)
2108 write_dump(dump_write);
2109 if (sec_mismatch_count && !sec_mismatch_verbose)
2110 warn("modpost: Found %d section mismatch(es).\n"
2111 "To see full details build your kernel with:\n"
2112 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2113 sec_mismatch_count);
2114
2115 return err;
2116 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree