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[mirror_ubuntu-artful-kernel.git] / scripts / mod / modpost.c
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
6 * Based in part on module-init-tools/depmod.c,file2alias
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * Usage: modpost vmlinux module1.o module2.o ...
12 */
13
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <ctype.h>
17 #include <string.h>
18 #include <limits.h>
19 #include <stdbool.h>
20 #include <errno.h>
21 #include "modpost.h"
22 #include "../../include/generated/autoconf.h"
23 #include "../../include/linux/license.h"
24 #include "../../include/linux/export.h"
25
26 /* Are we using CONFIG_MODVERSIONS? */
27 int modversions = 0;
28 /* Warn about undefined symbols? (do so if we have vmlinux) */
29 int have_vmlinux = 0;
30 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
31 static int all_versions = 0;
32 /* If we are modposting external module set to 1 */
33 static int external_module = 0;
34 /* Warn about section mismatch in vmlinux if set to 1 */
35 static int vmlinux_section_warnings = 1;
36 /* Only warn about unresolved symbols */
37 static int warn_unresolved = 0;
38 /* How a symbol is exported */
39 static int sec_mismatch_count = 0;
40 static int sec_mismatch_verbose = 1;
41 /* ignore missing files */
42 static int ignore_missing_files;
43
44 enum export {
45 export_plain, export_unused, export_gpl,
46 export_unused_gpl, export_gpl_future, export_unknown
47 };
48
49 #define PRINTF __attribute__ ((format (printf, 1, 2)))
50
51 PRINTF void fatal(const char *fmt, ...)
52 {
53 va_list arglist;
54
55 fprintf(stderr, "FATAL: ");
56
57 va_start(arglist, fmt);
58 vfprintf(stderr, fmt, arglist);
59 va_end(arglist);
60
61 exit(1);
62 }
63
64 PRINTF void warn(const char *fmt, ...)
65 {
66 va_list arglist;
67
68 fprintf(stderr, "WARNING: ");
69
70 va_start(arglist, fmt);
71 vfprintf(stderr, fmt, arglist);
72 va_end(arglist);
73 }
74
75 PRINTF void merror(const char *fmt, ...)
76 {
77 va_list arglist;
78
79 fprintf(stderr, "ERROR: ");
80
81 va_start(arglist, fmt);
82 vfprintf(stderr, fmt, arglist);
83 va_end(arglist);
84 }
85
86 static inline bool strends(const char *str, const char *postfix)
87 {
88 if (strlen(str) < strlen(postfix))
89 return false;
90
91 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
92 }
93
94 static int is_vmlinux(const char *modname)
95 {
96 const char *myname;
97
98 myname = strrchr(modname, '/');
99 if (myname)
100 myname++;
101 else
102 myname = modname;
103
104 return (strcmp(myname, "vmlinux") == 0) ||
105 (strcmp(myname, "vmlinux.o") == 0);
106 }
107
108 void *do_nofail(void *ptr, const char *expr)
109 {
110 if (!ptr)
111 fatal("modpost: Memory allocation failure: %s.\n", expr);
112
113 return ptr;
114 }
115
116 /* A list of all modules we processed */
117 static struct module *modules;
118
119 static struct module *find_module(char *modname)
120 {
121 struct module *mod;
122
123 for (mod = modules; mod; mod = mod->next)
124 if (strcmp(mod->name, modname) == 0)
125 break;
126 return mod;
127 }
128
129 static struct module *new_module(const char *modname)
130 {
131 struct module *mod;
132 char *p;
133
134 mod = NOFAIL(malloc(sizeof(*mod)));
135 memset(mod, 0, sizeof(*mod));
136 p = NOFAIL(strdup(modname));
137
138 /* strip trailing .o */
139 if (strends(p, ".o")) {
140 p[strlen(p) - 2] = '\0';
141 mod->is_dot_o = 1;
142 }
143
144 /* add to list */
145 mod->name = p;
146 mod->gpl_compatible = -1;
147 mod->next = modules;
148 modules = mod;
149
150 return mod;
151 }
152
153 /* A hash of all exported symbols,
154 * struct symbol is also used for lists of unresolved symbols */
155
156 #define SYMBOL_HASH_SIZE 1024
157
158 struct symbol {
159 struct symbol *next;
160 struct module *module;
161 unsigned int crc;
162 int crc_valid;
163 unsigned int weak:1;
164 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
165 unsigned int kernel:1; /* 1 if symbol is from kernel
166 * (only for external modules) **/
167 unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */
168 enum export export; /* Type of export */
169 char name[0];
170 };
171
172 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
173
174 /* This is based on the hash agorithm from gdbm, via tdb */
175 static inline unsigned int tdb_hash(const char *name)
176 {
177 unsigned value; /* Used to compute the hash value. */
178 unsigned i; /* Used to cycle through random values. */
179
180 /* Set the initial value from the key size. */
181 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
182 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
183
184 return (1103515243 * value + 12345);
185 }
186
187 /**
188 * Allocate a new symbols for use in the hash of exported symbols or
189 * the list of unresolved symbols per module
190 **/
191 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
192 struct symbol *next)
193 {
194 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
195
196 memset(s, 0, sizeof(*s));
197 strcpy(s->name, name);
198 s->weak = weak;
199 s->next = next;
200 return s;
201 }
202
203 /* For the hash of exported symbols */
204 static struct symbol *new_symbol(const char *name, struct module *module,
205 enum export export)
206 {
207 unsigned int hash;
208 struct symbol *new;
209
210 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
211 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
212 new->module = module;
213 new->export = export;
214 return new;
215 }
216
217 static struct symbol *find_symbol(const char *name)
218 {
219 struct symbol *s;
220
221 /* For our purposes, .foo matches foo. PPC64 needs this. */
222 if (name[0] == '.')
223 name++;
224
225 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
226 if (strcmp(s->name, name) == 0)
227 return s;
228 }
229 return NULL;
230 }
231
232 static struct {
233 const char *str;
234 enum export export;
235 } export_list[] = {
236 { .str = "EXPORT_SYMBOL", .export = export_plain },
237 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
238 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
239 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
240 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
241 { .str = "(unknown)", .export = export_unknown },
242 };
243
244
245 static const char *export_str(enum export ex)
246 {
247 return export_list[ex].str;
248 }
249
250 static enum export export_no(const char *s)
251 {
252 int i;
253
254 if (!s)
255 return export_unknown;
256 for (i = 0; export_list[i].export != export_unknown; i++) {
257 if (strcmp(export_list[i].str, s) == 0)
258 return export_list[i].export;
259 }
260 return export_unknown;
261 }
262
263 static const char *sec_name(struct elf_info *elf, int secindex);
264
265 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
266
267 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
268 {
269 const char *secname = sec_name(elf, sec);
270
271 if (strstarts(secname, "___ksymtab+"))
272 return export_plain;
273 else if (strstarts(secname, "___ksymtab_unused+"))
274 return export_unused;
275 else if (strstarts(secname, "___ksymtab_gpl+"))
276 return export_gpl;
277 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
278 return export_unused_gpl;
279 else if (strstarts(secname, "___ksymtab_gpl_future+"))
280 return export_gpl_future;
281 else
282 return export_unknown;
283 }
284
285 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
286 {
287 if (sec == elf->export_sec)
288 return export_plain;
289 else if (sec == elf->export_unused_sec)
290 return export_unused;
291 else if (sec == elf->export_gpl_sec)
292 return export_gpl;
293 else if (sec == elf->export_unused_gpl_sec)
294 return export_unused_gpl;
295 else if (sec == elf->export_gpl_future_sec)
296 return export_gpl_future;
297 else
298 return export_unknown;
299 }
300
301 /**
302 * Add an exported symbol - it may have already been added without a
303 * CRC, in this case just update the CRC
304 **/
305 static struct symbol *sym_add_exported(const char *name, struct module *mod,
306 enum export export)
307 {
308 struct symbol *s = find_symbol(name);
309
310 if (!s) {
311 s = new_symbol(name, mod, export);
312 } else {
313 if (!s->preloaded) {
314 warn("%s: '%s' exported twice. Previous export "
315 "was in %s%s\n", mod->name, name,
316 s->module->name,
317 is_vmlinux(s->module->name) ?"":".ko");
318 } else {
319 /* In case Modules.symvers was out of date */
320 s->module = mod;
321 }
322 }
323 s->preloaded = 0;
324 s->vmlinux = is_vmlinux(mod->name);
325 s->kernel = 0;
326 s->export = export;
327 return s;
328 }
329
330 static void sym_update_crc(const char *name, struct module *mod,
331 unsigned int crc, enum export export)
332 {
333 struct symbol *s = find_symbol(name);
334
335 if (!s) {
336 s = new_symbol(name, mod, export);
337 /* Don't complain when we find it later. */
338 s->preloaded = 1;
339 }
340 s->crc = crc;
341 s->crc_valid = 1;
342 }
343
344 void *grab_file(const char *filename, unsigned long *size)
345 {
346 struct stat st;
347 void *map = MAP_FAILED;
348 int fd;
349
350 fd = open(filename, O_RDONLY);
351 if (fd < 0)
352 return NULL;
353 if (fstat(fd, &st))
354 goto failed;
355
356 *size = st.st_size;
357 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
358
359 failed:
360 close(fd);
361 if (map == MAP_FAILED)
362 return NULL;
363 return map;
364 }
365
366 /**
367 * Return a copy of the next line in a mmap'ed file.
368 * spaces in the beginning of the line is trimmed away.
369 * Return a pointer to a static buffer.
370 **/
371 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
372 {
373 static char line[4096];
374 int skip = 1;
375 size_t len = 0;
376 signed char *p = (signed char *)file + *pos;
377 char *s = line;
378
379 for (; *pos < size ; (*pos)++) {
380 if (skip && isspace(*p)) {
381 p++;
382 continue;
383 }
384 skip = 0;
385 if (*p != '\n' && (*pos < size)) {
386 len++;
387 *s++ = *p++;
388 if (len > 4095)
389 break; /* Too long, stop */
390 } else {
391 /* End of string */
392 *s = '\0';
393 return line;
394 }
395 }
396 /* End of buffer */
397 return NULL;
398 }
399
400 void release_file(void *file, unsigned long size)
401 {
402 munmap(file, size);
403 }
404
405 static int parse_elf(struct elf_info *info, const char *filename)
406 {
407 unsigned int i;
408 Elf_Ehdr *hdr;
409 Elf_Shdr *sechdrs;
410 Elf_Sym *sym;
411 const char *secstrings;
412 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
413
414 hdr = grab_file(filename, &info->size);
415 if (!hdr) {
416 if (ignore_missing_files) {
417 fprintf(stderr, "%s: %s (ignored)\n", filename,
418 strerror(errno));
419 return 0;
420 }
421 perror(filename);
422 exit(1);
423 }
424 info->hdr = hdr;
425 if (info->size < sizeof(*hdr)) {
426 /* file too small, assume this is an empty .o file */
427 return 0;
428 }
429 /* Is this a valid ELF file? */
430 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
431 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
432 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
433 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
434 /* Not an ELF file - silently ignore it */
435 return 0;
436 }
437 /* Fix endianness in ELF header */
438 hdr->e_type = TO_NATIVE(hdr->e_type);
439 hdr->e_machine = TO_NATIVE(hdr->e_machine);
440 hdr->e_version = TO_NATIVE(hdr->e_version);
441 hdr->e_entry = TO_NATIVE(hdr->e_entry);
442 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
443 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
444 hdr->e_flags = TO_NATIVE(hdr->e_flags);
445 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
446 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
447 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
448 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
449 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
450 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
451 sechdrs = (void *)hdr + hdr->e_shoff;
452 info->sechdrs = sechdrs;
453
454 /* Check if file offset is correct */
455 if (hdr->e_shoff > info->size) {
456 fatal("section header offset=%lu in file '%s' is bigger than "
457 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
458 filename, info->size);
459 return 0;
460 }
461
462 if (hdr->e_shnum == SHN_UNDEF) {
463 /*
464 * There are more than 64k sections,
465 * read count from .sh_size.
466 */
467 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
468 }
469 else {
470 info->num_sections = hdr->e_shnum;
471 }
472 if (hdr->e_shstrndx == SHN_XINDEX) {
473 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
474 }
475 else {
476 info->secindex_strings = hdr->e_shstrndx;
477 }
478
479 /* Fix endianness in section headers */
480 for (i = 0; i < info->num_sections; i++) {
481 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
482 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
483 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
484 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
485 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
486 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
487 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
488 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
489 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
490 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
491 }
492 /* Find symbol table. */
493 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
494 for (i = 1; i < info->num_sections; i++) {
495 const char *secname;
496 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
497
498 if (!nobits && sechdrs[i].sh_offset > info->size) {
499 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
500 "sizeof(*hrd)=%zu\n", filename,
501 (unsigned long)sechdrs[i].sh_offset,
502 sizeof(*hdr));
503 return 0;
504 }
505 secname = secstrings + sechdrs[i].sh_name;
506 if (strcmp(secname, ".modinfo") == 0) {
507 if (nobits)
508 fatal("%s has NOBITS .modinfo\n", filename);
509 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
510 info->modinfo_len = sechdrs[i].sh_size;
511 } else if (strcmp(secname, "__ksymtab") == 0)
512 info->export_sec = i;
513 else if (strcmp(secname, "__ksymtab_unused") == 0)
514 info->export_unused_sec = i;
515 else if (strcmp(secname, "__ksymtab_gpl") == 0)
516 info->export_gpl_sec = i;
517 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
518 info->export_unused_gpl_sec = i;
519 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
520 info->export_gpl_future_sec = i;
521
522 if (sechdrs[i].sh_type == SHT_SYMTAB) {
523 unsigned int sh_link_idx;
524 symtab_idx = i;
525 info->symtab_start = (void *)hdr +
526 sechdrs[i].sh_offset;
527 info->symtab_stop = (void *)hdr +
528 sechdrs[i].sh_offset + sechdrs[i].sh_size;
529 sh_link_idx = sechdrs[i].sh_link;
530 info->strtab = (void *)hdr +
531 sechdrs[sh_link_idx].sh_offset;
532 }
533
534 /* 32bit section no. table? ("more than 64k sections") */
535 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
536 symtab_shndx_idx = i;
537 info->symtab_shndx_start = (void *)hdr +
538 sechdrs[i].sh_offset;
539 info->symtab_shndx_stop = (void *)hdr +
540 sechdrs[i].sh_offset + sechdrs[i].sh_size;
541 }
542 }
543 if (!info->symtab_start)
544 fatal("%s has no symtab?\n", filename);
545
546 /* Fix endianness in symbols */
547 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
548 sym->st_shndx = TO_NATIVE(sym->st_shndx);
549 sym->st_name = TO_NATIVE(sym->st_name);
550 sym->st_value = TO_NATIVE(sym->st_value);
551 sym->st_size = TO_NATIVE(sym->st_size);
552 }
553
554 if (symtab_shndx_idx != ~0U) {
555 Elf32_Word *p;
556 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
557 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
558 filename, sechdrs[symtab_shndx_idx].sh_link,
559 symtab_idx);
560 /* Fix endianness */
561 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
562 p++)
563 *p = TO_NATIVE(*p);
564 }
565
566 return 1;
567 }
568
569 static void parse_elf_finish(struct elf_info *info)
570 {
571 release_file(info->hdr, info->size);
572 }
573
574 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
575 {
576 /* ignore __this_module, it will be resolved shortly */
577 if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
578 return 1;
579 /* ignore global offset table */
580 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
581 return 1;
582 if (info->hdr->e_machine == EM_PPC)
583 /* Special register function linked on all modules during final link of .ko */
584 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
585 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
586 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
587 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
588 return 1;
589 if (info->hdr->e_machine == EM_PPC64)
590 /* Special register function linked on all modules during final link of .ko */
591 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
592 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
593 return 1;
594 /* Do not ignore this symbol */
595 return 0;
596 }
597
598 #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
599 #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
600
601 static void handle_modversions(struct module *mod, struct elf_info *info,
602 Elf_Sym *sym, const char *symname)
603 {
604 unsigned int crc;
605 enum export export;
606
607 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
608 strncmp(symname, "__ksymtab", 9) == 0)
609 export = export_from_secname(info, get_secindex(info, sym));
610 else
611 export = export_from_sec(info, get_secindex(info, sym));
612
613 /* CRC'd symbol */
614 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
615 crc = (unsigned int) sym->st_value;
616 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
617 export);
618 }
619
620 switch (sym->st_shndx) {
621 case SHN_COMMON:
622 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
623 break;
624 case SHN_UNDEF:
625 /* undefined symbol */
626 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
627 ELF_ST_BIND(sym->st_info) != STB_WEAK)
628 break;
629 if (ignore_undef_symbol(info, symname))
630 break;
631 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
632 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
633 /* add compatibility with older glibc */
634 #ifndef STT_SPARC_REGISTER
635 #define STT_SPARC_REGISTER STT_REGISTER
636 #endif
637 if (info->hdr->e_machine == EM_SPARC ||
638 info->hdr->e_machine == EM_SPARCV9) {
639 /* Ignore register directives. */
640 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
641 break;
642 if (symname[0] == '.') {
643 char *munged = strdup(symname);
644 munged[0] = '_';
645 munged[1] = toupper(munged[1]);
646 symname = munged;
647 }
648 }
649 #endif
650
651 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
652 if (symname[0] != '_')
653 break;
654 else
655 symname++;
656 #endif
657 mod->unres = alloc_symbol(symname,
658 ELF_ST_BIND(sym->st_info) == STB_WEAK,
659 mod->unres);
660 break;
661 default:
662 /* All exported symbols */
663 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
664 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
665 export);
666 }
667 if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
668 mod->has_init = 1;
669 if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
670 mod->has_cleanup = 1;
671 break;
672 }
673 }
674
675 /**
676 * Parse tag=value strings from .modinfo section
677 **/
678 static char *next_string(char *string, unsigned long *secsize)
679 {
680 /* Skip non-zero chars */
681 while (string[0]) {
682 string++;
683 if ((*secsize)-- <= 1)
684 return NULL;
685 }
686
687 /* Skip any zero padding. */
688 while (!string[0]) {
689 string++;
690 if ((*secsize)-- <= 1)
691 return NULL;
692 }
693 return string;
694 }
695
696 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
697 const char *tag, char *info)
698 {
699 char *p;
700 unsigned int taglen = strlen(tag);
701 unsigned long size = modinfo_len;
702
703 if (info) {
704 size -= info - (char *)modinfo;
705 modinfo = next_string(info, &size);
706 }
707
708 for (p = modinfo; p; p = next_string(p, &size)) {
709 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
710 return p + taglen + 1;
711 }
712 return NULL;
713 }
714
715 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
716 const char *tag)
717
718 {
719 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
720 }
721
722 /**
723 * Test if string s ends in string sub
724 * return 0 if match
725 **/
726 static int strrcmp(const char *s, const char *sub)
727 {
728 int slen, sublen;
729
730 if (!s || !sub)
731 return 1;
732
733 slen = strlen(s);
734 sublen = strlen(sub);
735
736 if ((slen == 0) || (sublen == 0))
737 return 1;
738
739 if (sublen > slen)
740 return 1;
741
742 return memcmp(s + slen - sublen, sub, sublen);
743 }
744
745 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
746 {
747 if (sym)
748 return elf->strtab + sym->st_name;
749 else
750 return "(unknown)";
751 }
752
753 static const char *sec_name(struct elf_info *elf, int secindex)
754 {
755 Elf_Shdr *sechdrs = elf->sechdrs;
756 return (void *)elf->hdr +
757 elf->sechdrs[elf->secindex_strings].sh_offset +
758 sechdrs[secindex].sh_name;
759 }
760
761 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
762 {
763 return (void *)elf->hdr +
764 elf->sechdrs[elf->secindex_strings].sh_offset +
765 sechdr->sh_name;
766 }
767
768 /* if sym is empty or point to a string
769 * like ".[0-9]+" then return 1.
770 * This is the optional prefix added by ld to some sections
771 */
772 static int number_prefix(const char *sym)
773 {
774 if (*sym++ == '\0')
775 return 1;
776 if (*sym != '.')
777 return 0;
778 do {
779 char c = *sym++;
780 if (c < '0' || c > '9')
781 return 0;
782 } while (*sym);
783 return 1;
784 }
785
786 /* The pattern is an array of simple patterns.
787 * "foo" will match an exact string equal to "foo"
788 * "*foo" will match a string that ends with "foo"
789 * "foo*" will match a string that begins with "foo"
790 * "foo$" will match a string equal to "foo" or "foo.1"
791 * where the '1' can be any number including several digits.
792 * The $ syntax is for sections where ld append a dot number
793 * to make section name unique.
794 */
795 static int match(const char *sym, const char * const pat[])
796 {
797 const char *p;
798 while (*pat) {
799 p = *pat++;
800 const char *endp = p + strlen(p) - 1;
801
802 /* "*foo" */
803 if (*p == '*') {
804 if (strrcmp(sym, p + 1) == 0)
805 return 1;
806 }
807 /* "foo*" */
808 else if (*endp == '*') {
809 if (strncmp(sym, p, strlen(p) - 1) == 0)
810 return 1;
811 }
812 /* "foo$" */
813 else if (*endp == '$') {
814 if (strncmp(sym, p, strlen(p) - 1) == 0) {
815 if (number_prefix(sym + strlen(p) - 1))
816 return 1;
817 }
818 }
819 /* no wildcards */
820 else {
821 if (strcmp(p, sym) == 0)
822 return 1;
823 }
824 }
825 /* no match */
826 return 0;
827 }
828
829 /* sections that we do not want to do full section mismatch check on */
830 static const char *section_white_list[] =
831 {
832 ".comment*",
833 ".debug*",
834 ".cranges", /* sh64 */
835 ".zdebug*", /* Compressed debug sections. */
836 ".GCC-command-line", /* mn10300 */
837 ".GCC.command.line", /* record-gcc-switches, non mn10300 */
838 ".mdebug*", /* alpha, score, mips etc. */
839 ".pdr", /* alpha, score, mips etc. */
840 ".stab*",
841 ".note*",
842 ".got*",
843 ".toc*",
844 ".xt.prop", /* xtensa */
845 ".xt.lit", /* xtensa */
846 ".arcextmap*", /* arc */
847 ".gnu.linkonce.arcext*", /* arc : modules */
848 NULL
849 };
850
851 /*
852 * This is used to find sections missing the SHF_ALLOC flag.
853 * The cause of this is often a section specified in assembler
854 * without "ax" / "aw".
855 */
856 static void check_section(const char *modname, struct elf_info *elf,
857 Elf_Shdr *sechdr)
858 {
859 const char *sec = sech_name(elf, sechdr);
860
861 if (sechdr->sh_type == SHT_PROGBITS &&
862 !(sechdr->sh_flags & SHF_ALLOC) &&
863 !match(sec, section_white_list)) {
864 warn("%s (%s): unexpected non-allocatable section.\n"
865 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
866 "Note that for example <linux/init.h> contains\n"
867 "section definitions for use in .S files.\n\n",
868 modname, sec);
869 }
870 }
871
872
873
874 #define ALL_INIT_DATA_SECTIONS \
875 ".init.setup$", ".init.rodata$", ".meminit.rodata$", \
876 ".init.data$", ".meminit.data$"
877 #define ALL_EXIT_DATA_SECTIONS \
878 ".exit.data$", ".memexit.data$"
879
880 #define ALL_INIT_TEXT_SECTIONS \
881 ".init.text$", ".meminit.text$"
882 #define ALL_EXIT_TEXT_SECTIONS \
883 ".exit.text$", ".memexit.text$"
884
885 #define ALL_PCI_INIT_SECTIONS \
886 ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
887 ".pci_fixup_enable$", ".pci_fixup_resume$", \
888 ".pci_fixup_resume_early$", ".pci_fixup_suspend$"
889
890 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
891 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
892
893 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
894 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
895
896 #define DATA_SECTIONS ".data$", ".data.rel$"
897 #define TEXT_SECTIONS ".text$", ".text.unlikely$"
898
899 #define INIT_SECTIONS ".init.*"
900 #define MEM_INIT_SECTIONS ".meminit.*"
901
902 #define EXIT_SECTIONS ".exit.*"
903 #define MEM_EXIT_SECTIONS ".memexit.*"
904
905 /* init data sections */
906 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
907
908 /* all init sections */
909 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
910
911 /* All init and exit sections (code + data) */
912 static const char *init_exit_sections[] =
913 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
914
915 /* data section */
916 static const char *data_sections[] = { DATA_SECTIONS, NULL };
917
918
919 /* symbols in .data that may refer to init/exit sections */
920 #define DEFAULT_SYMBOL_WHITE_LIST \
921 "*driver", \
922 "*_template", /* scsi uses *_template a lot */ \
923 "*_timer", /* arm uses ops structures named _timer a lot */ \
924 "*_sht", /* scsi also used *_sht to some extent */ \
925 "*_ops", \
926 "*_probe", \
927 "*_probe_one", \
928 "*_console"
929
930 static const char *head_sections[] = { ".head.text*", NULL };
931 static const char *linker_symbols[] =
932 { "__init_begin", "_sinittext", "_einittext", NULL };
933
934 enum mismatch {
935 TEXT_TO_ANY_INIT,
936 DATA_TO_ANY_INIT,
937 TEXT_TO_ANY_EXIT,
938 DATA_TO_ANY_EXIT,
939 XXXINIT_TO_SOME_INIT,
940 XXXEXIT_TO_SOME_EXIT,
941 ANY_INIT_TO_ANY_EXIT,
942 ANY_EXIT_TO_ANY_INIT,
943 EXPORT_TO_INIT_EXIT,
944 };
945
946 struct sectioncheck {
947 const char *fromsec[20];
948 const char *tosec[20];
949 enum mismatch mismatch;
950 const char *symbol_white_list[20];
951 };
952
953 const struct sectioncheck sectioncheck[] = {
954 /* Do not reference init/exit code/data from
955 * normal code and data
956 */
957 {
958 .fromsec = { TEXT_SECTIONS, NULL },
959 .tosec = { ALL_INIT_SECTIONS, NULL },
960 .mismatch = TEXT_TO_ANY_INIT,
961 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
962 },
963 {
964 .fromsec = { DATA_SECTIONS, NULL },
965 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
966 .mismatch = DATA_TO_ANY_INIT,
967 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
968 },
969 {
970 .fromsec = { DATA_SECTIONS, NULL },
971 .tosec = { INIT_SECTIONS, NULL },
972 .mismatch = DATA_TO_ANY_INIT,
973 .symbol_white_list = {
974 "*_template", "*_timer", "*_sht", "*_ops",
975 "*_probe", "*_probe_one", "*_console", NULL
976 },
977 },
978 {
979 .fromsec = { TEXT_SECTIONS, NULL },
980 .tosec = { ALL_EXIT_SECTIONS, NULL },
981 .mismatch = TEXT_TO_ANY_EXIT,
982 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
983 },
984 {
985 .fromsec = { DATA_SECTIONS, NULL },
986 .tosec = { ALL_EXIT_SECTIONS, NULL },
987 .mismatch = DATA_TO_ANY_EXIT,
988 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
989 },
990 /* Do not reference init code/data from meminit code/data */
991 {
992 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
993 .tosec = { INIT_SECTIONS, NULL },
994 .mismatch = XXXINIT_TO_SOME_INIT,
995 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
996 },
997 /* Do not reference exit code/data from memexit code/data */
998 {
999 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1000 .tosec = { EXIT_SECTIONS, NULL },
1001 .mismatch = XXXEXIT_TO_SOME_EXIT,
1002 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1003 },
1004 /* Do not use exit code/data from init code */
1005 {
1006 .fromsec = { ALL_INIT_SECTIONS, NULL },
1007 .tosec = { ALL_EXIT_SECTIONS, NULL },
1008 .mismatch = ANY_INIT_TO_ANY_EXIT,
1009 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1010 },
1011 /* Do not use init code/data from exit code */
1012 {
1013 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1014 .tosec = { ALL_INIT_SECTIONS, NULL },
1015 .mismatch = ANY_EXIT_TO_ANY_INIT,
1016 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1017 },
1018 {
1019 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1020 .tosec = { INIT_SECTIONS, NULL },
1021 .mismatch = ANY_INIT_TO_ANY_EXIT,
1022 .symbol_white_list = { NULL },
1023 },
1024 /* Do not export init/exit functions or data */
1025 {
1026 .fromsec = { "__ksymtab*", NULL },
1027 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1028 .mismatch = EXPORT_TO_INIT_EXIT,
1029 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1030 }
1031 };
1032
1033 static const struct sectioncheck *section_mismatch(
1034 const char *fromsec, const char *tosec)
1035 {
1036 int i;
1037 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1038 const struct sectioncheck *check = &sectioncheck[0];
1039
1040 for (i = 0; i < elems; i++) {
1041 if (match(fromsec, check->fromsec) &&
1042 match(tosec, check->tosec))
1043 return check;
1044 check++;
1045 }
1046 return NULL;
1047 }
1048
1049 /**
1050 * Whitelist to allow certain references to pass with no warning.
1051 *
1052 * Pattern 1:
1053 * If a module parameter is declared __initdata and permissions=0
1054 * then this is legal despite the warning generated.
1055 * We cannot see value of permissions here, so just ignore
1056 * this pattern.
1057 * The pattern is identified by:
1058 * tosec = .init.data
1059 * fromsec = .data*
1060 * atsym =__param*
1061 *
1062 * Pattern 1a:
1063 * module_param_call() ops can refer to __init set function if permissions=0
1064 * The pattern is identified by:
1065 * tosec = .init.text
1066 * fromsec = .data*
1067 * atsym = __param_ops_*
1068 *
1069 * Pattern 2:
1070 * Many drivers utilise a *driver container with references to
1071 * add, remove, probe functions etc.
1072 * the pattern is identified by:
1073 * tosec = init or exit section
1074 * fromsec = data section
1075 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1076 * *probe_one, *_console, *_timer
1077 *
1078 * Pattern 3:
1079 * Whitelist all references from .head.text to any init section
1080 *
1081 * Pattern 4:
1082 * Some symbols belong to init section but still it is ok to reference
1083 * these from non-init sections as these symbols don't have any memory
1084 * allocated for them and symbol address and value are same. So even
1085 * if init section is freed, its ok to reference those symbols.
1086 * For ex. symbols marking the init section boundaries.
1087 * This pattern is identified by
1088 * refsymname = __init_begin, _sinittext, _einittext
1089 *
1090 **/
1091 static int secref_whitelist(const struct sectioncheck *mismatch,
1092 const char *fromsec, const char *fromsym,
1093 const char *tosec, const char *tosym)
1094 {
1095 /* Check for pattern 1 */
1096 if (match(tosec, init_data_sections) &&
1097 match(fromsec, data_sections) &&
1098 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1099 return 0;
1100
1101 /* Check for pattern 1a */
1102 if (strcmp(tosec, ".init.text") == 0 &&
1103 match(fromsec, data_sections) &&
1104 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1105 return 0;
1106
1107 /* Check for pattern 2 */
1108 if (match(tosec, init_exit_sections) &&
1109 match(fromsec, data_sections) &&
1110 match(fromsym, mismatch->symbol_white_list))
1111 return 0;
1112
1113 /* Check for pattern 3 */
1114 if (match(fromsec, head_sections) &&
1115 match(tosec, init_sections))
1116 return 0;
1117
1118 /* Check for pattern 4 */
1119 if (match(tosym, linker_symbols))
1120 return 0;
1121
1122 return 1;
1123 }
1124
1125 /**
1126 * Find symbol based on relocation record info.
1127 * In some cases the symbol supplied is a valid symbol so
1128 * return refsym. If st_name != 0 we assume this is a valid symbol.
1129 * In other cases the symbol needs to be looked up in the symbol table
1130 * based on section and address.
1131 * **/
1132 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1133 Elf_Sym *relsym)
1134 {
1135 Elf_Sym *sym;
1136 Elf_Sym *near = NULL;
1137 Elf64_Sword distance = 20;
1138 Elf64_Sword d;
1139 unsigned int relsym_secindex;
1140
1141 if (relsym->st_name != 0)
1142 return relsym;
1143
1144 relsym_secindex = get_secindex(elf, relsym);
1145 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1146 if (get_secindex(elf, sym) != relsym_secindex)
1147 continue;
1148 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1149 continue;
1150 if (sym->st_value == addr)
1151 return sym;
1152 /* Find a symbol nearby - addr are maybe negative */
1153 d = sym->st_value - addr;
1154 if (d < 0)
1155 d = addr - sym->st_value;
1156 if (d < distance) {
1157 distance = d;
1158 near = sym;
1159 }
1160 }
1161 /* We need a close match */
1162 if (distance < 20)
1163 return near;
1164 else
1165 return NULL;
1166 }
1167
1168 static inline int is_arm_mapping_symbol(const char *str)
1169 {
1170 return str[0] == '$' && strchr("atd", str[1])
1171 && (str[2] == '\0' || str[2] == '.');
1172 }
1173
1174 /*
1175 * If there's no name there, ignore it; likewise, ignore it if it's
1176 * one of the magic symbols emitted used by current ARM tools.
1177 *
1178 * Otherwise if find_symbols_between() returns those symbols, they'll
1179 * fail the whitelist tests and cause lots of false alarms ... fixable
1180 * only by merging __exit and __init sections into __text, bloating
1181 * the kernel (which is especially evil on embedded platforms).
1182 */
1183 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1184 {
1185 const char *name = elf->strtab + sym->st_name;
1186
1187 if (!name || !strlen(name))
1188 return 0;
1189 return !is_arm_mapping_symbol(name);
1190 }
1191
1192 /*
1193 * Find symbols before or equal addr and after addr - in the section sec.
1194 * If we find two symbols with equal offset prefer one with a valid name.
1195 * The ELF format may have a better way to detect what type of symbol
1196 * it is, but this works for now.
1197 **/
1198 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1199 const char *sec)
1200 {
1201 Elf_Sym *sym;
1202 Elf_Sym *near = NULL;
1203 Elf_Addr distance = ~0;
1204
1205 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1206 const char *symsec;
1207
1208 if (is_shndx_special(sym->st_shndx))
1209 continue;
1210 symsec = sec_name(elf, get_secindex(elf, sym));
1211 if (strcmp(symsec, sec) != 0)
1212 continue;
1213 if (!is_valid_name(elf, sym))
1214 continue;
1215 if (sym->st_value <= addr) {
1216 if ((addr - sym->st_value) < distance) {
1217 distance = addr - sym->st_value;
1218 near = sym;
1219 } else if ((addr - sym->st_value) == distance) {
1220 near = sym;
1221 }
1222 }
1223 }
1224 return near;
1225 }
1226
1227 /*
1228 * Convert a section name to the function/data attribute
1229 * .init.text => __init
1230 * .memexitconst => __memconst
1231 * etc.
1232 *
1233 * The memory of returned value has been allocated on a heap. The user of this
1234 * method should free it after usage.
1235 */
1236 static char *sec2annotation(const char *s)
1237 {
1238 if (match(s, init_exit_sections)) {
1239 char *p = malloc(20);
1240 char *r = p;
1241
1242 *p++ = '_';
1243 *p++ = '_';
1244 if (*s == '.')
1245 s++;
1246 while (*s && *s != '.')
1247 *p++ = *s++;
1248 *p = '\0';
1249 if (*s == '.')
1250 s++;
1251 if (strstr(s, "rodata") != NULL)
1252 strcat(p, "const ");
1253 else if (strstr(s, "data") != NULL)
1254 strcat(p, "data ");
1255 else
1256 strcat(p, " ");
1257 return r;
1258 } else {
1259 return strdup("");
1260 }
1261 }
1262
1263 static int is_function(Elf_Sym *sym)
1264 {
1265 if (sym)
1266 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1267 else
1268 return -1;
1269 }
1270
1271 static void print_section_list(const char * const list[20])
1272 {
1273 const char *const *s = list;
1274
1275 while (*s) {
1276 fprintf(stderr, "%s", *s);
1277 s++;
1278 if (*s)
1279 fprintf(stderr, ", ");
1280 }
1281 fprintf(stderr, "\n");
1282 }
1283
1284 /*
1285 * Print a warning about a section mismatch.
1286 * Try to find symbols near it so user can find it.
1287 * Check whitelist before warning - it may be a false positive.
1288 */
1289 static void report_sec_mismatch(const char *modname,
1290 const struct sectioncheck *mismatch,
1291 const char *fromsec,
1292 unsigned long long fromaddr,
1293 const char *fromsym,
1294 int from_is_func,
1295 const char *tosec, const char *tosym,
1296 int to_is_func)
1297 {
1298 const char *from, *from_p;
1299 const char *to, *to_p;
1300 char *prl_from;
1301 char *prl_to;
1302
1303 switch (from_is_func) {
1304 case 0: from = "variable"; from_p = ""; break;
1305 case 1: from = "function"; from_p = "()"; break;
1306 default: from = "(unknown reference)"; from_p = ""; break;
1307 }
1308 switch (to_is_func) {
1309 case 0: to = "variable"; to_p = ""; break;
1310 case 1: to = "function"; to_p = "()"; break;
1311 default: to = "(unknown reference)"; to_p = ""; break;
1312 }
1313
1314 sec_mismatch_count++;
1315 if (!sec_mismatch_verbose)
1316 return;
1317
1318 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1319 "to the %s %s:%s%s\n",
1320 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1321 tosym, to_p);
1322
1323 switch (mismatch->mismatch) {
1324 case TEXT_TO_ANY_INIT:
1325 prl_from = sec2annotation(fromsec);
1326 prl_to = sec2annotation(tosec);
1327 fprintf(stderr,
1328 "The function %s%s() references\n"
1329 "the %s %s%s%s.\n"
1330 "This is often because %s lacks a %s\n"
1331 "annotation or the annotation of %s is wrong.\n",
1332 prl_from, fromsym,
1333 to, prl_to, tosym, to_p,
1334 fromsym, prl_to, tosym);
1335 free(prl_from);
1336 free(prl_to);
1337 break;
1338 case DATA_TO_ANY_INIT: {
1339 prl_to = sec2annotation(tosec);
1340 fprintf(stderr,
1341 "The variable %s references\n"
1342 "the %s %s%s%s\n"
1343 "If the reference is valid then annotate the\n"
1344 "variable with __init* or __refdata (see linux/init.h) "
1345 "or name the variable:\n",
1346 fromsym, to, prl_to, tosym, to_p);
1347 print_section_list(mismatch->symbol_white_list);
1348 free(prl_to);
1349 break;
1350 }
1351 case TEXT_TO_ANY_EXIT:
1352 prl_to = sec2annotation(tosec);
1353 fprintf(stderr,
1354 "The function %s() references a %s in an exit section.\n"
1355 "Often the %s %s%s has valid usage outside the exit section\n"
1356 "and the fix is to remove the %sannotation of %s.\n",
1357 fromsym, to, to, tosym, to_p, prl_to, tosym);
1358 free(prl_to);
1359 break;
1360 case DATA_TO_ANY_EXIT: {
1361 prl_to = sec2annotation(tosec);
1362 fprintf(stderr,
1363 "The variable %s references\n"
1364 "the %s %s%s%s\n"
1365 "If the reference is valid then annotate the\n"
1366 "variable with __exit* (see linux/init.h) or "
1367 "name the variable:\n",
1368 fromsym, to, prl_to, tosym, to_p);
1369 print_section_list(mismatch->symbol_white_list);
1370 free(prl_to);
1371 break;
1372 }
1373 case XXXINIT_TO_SOME_INIT:
1374 case XXXEXIT_TO_SOME_EXIT:
1375 prl_from = sec2annotation(fromsec);
1376 prl_to = sec2annotation(tosec);
1377 fprintf(stderr,
1378 "The %s %s%s%s references\n"
1379 "a %s %s%s%s.\n"
1380 "If %s is only used by %s then\n"
1381 "annotate %s with a matching annotation.\n",
1382 from, prl_from, fromsym, from_p,
1383 to, prl_to, tosym, to_p,
1384 tosym, fromsym, tosym);
1385 free(prl_from);
1386 free(prl_to);
1387 break;
1388 case ANY_INIT_TO_ANY_EXIT:
1389 prl_from = sec2annotation(fromsec);
1390 prl_to = sec2annotation(tosec);
1391 fprintf(stderr,
1392 "The %s %s%s%s references\n"
1393 "a %s %s%s%s.\n"
1394 "This is often seen when error handling "
1395 "in the init function\n"
1396 "uses functionality in the exit path.\n"
1397 "The fix is often to remove the %sannotation of\n"
1398 "%s%s so it may be used outside an exit section.\n",
1399 from, prl_from, fromsym, from_p,
1400 to, prl_to, tosym, to_p,
1401 prl_to, tosym, to_p);
1402 free(prl_from);
1403 free(prl_to);
1404 break;
1405 case ANY_EXIT_TO_ANY_INIT:
1406 prl_from = sec2annotation(fromsec);
1407 prl_to = sec2annotation(tosec);
1408 fprintf(stderr,
1409 "The %s %s%s%s references\n"
1410 "a %s %s%s%s.\n"
1411 "This is often seen when error handling "
1412 "in the exit function\n"
1413 "uses functionality in the init path.\n"
1414 "The fix is often to remove the %sannotation of\n"
1415 "%s%s so it may be used outside an init section.\n",
1416 from, prl_from, fromsym, from_p,
1417 to, prl_to, tosym, to_p,
1418 prl_to, tosym, to_p);
1419 free(prl_from);
1420 free(prl_to);
1421 break;
1422 case EXPORT_TO_INIT_EXIT:
1423 prl_to = sec2annotation(tosec);
1424 fprintf(stderr,
1425 "The symbol %s is exported and annotated %s\n"
1426 "Fix this by removing the %sannotation of %s "
1427 "or drop the export.\n",
1428 tosym, prl_to, prl_to, tosym);
1429 free(prl_to);
1430 break;
1431 }
1432 fprintf(stderr, "\n");
1433 }
1434
1435 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1436 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1437 {
1438 const char *tosec;
1439 const struct sectioncheck *mismatch;
1440
1441 tosec = sec_name(elf, get_secindex(elf, sym));
1442 mismatch = section_mismatch(fromsec, tosec);
1443 if (mismatch) {
1444 Elf_Sym *to;
1445 Elf_Sym *from;
1446 const char *tosym;
1447 const char *fromsym;
1448
1449 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1450 fromsym = sym_name(elf, from);
1451 to = find_elf_symbol(elf, r->r_addend, sym);
1452 tosym = sym_name(elf, to);
1453
1454 /* check whitelist - we may ignore it */
1455 if (secref_whitelist(mismatch,
1456 fromsec, fromsym, tosec, tosym)) {
1457 report_sec_mismatch(modname, mismatch,
1458 fromsec, r->r_offset, fromsym,
1459 is_function(from), tosec, tosym,
1460 is_function(to));
1461 }
1462 }
1463 }
1464
1465 static unsigned int *reloc_location(struct elf_info *elf,
1466 Elf_Shdr *sechdr, Elf_Rela *r)
1467 {
1468 Elf_Shdr *sechdrs = elf->sechdrs;
1469 int section = sechdr->sh_info;
1470
1471 return (void *)elf->hdr + sechdrs[section].sh_offset +
1472 r->r_offset;
1473 }
1474
1475 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1476 {
1477 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1478 unsigned int *location = reloc_location(elf, sechdr, r);
1479
1480 switch (r_typ) {
1481 case R_386_32:
1482 r->r_addend = TO_NATIVE(*location);
1483 break;
1484 case R_386_PC32:
1485 r->r_addend = TO_NATIVE(*location) + 4;
1486 /* For CONFIG_RELOCATABLE=y */
1487 if (elf->hdr->e_type == ET_EXEC)
1488 r->r_addend += r->r_offset;
1489 break;
1490 }
1491 return 0;
1492 }
1493
1494 #ifndef R_ARM_CALL
1495 #define R_ARM_CALL 28
1496 #endif
1497 #ifndef R_ARM_JUMP24
1498 #define R_ARM_JUMP24 29
1499 #endif
1500
1501 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1502 {
1503 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1504
1505 switch (r_typ) {
1506 case R_ARM_ABS32:
1507 /* From ARM ABI: (S + A) | T */
1508 r->r_addend = (int)(long)
1509 (elf->symtab_start + ELF_R_SYM(r->r_info));
1510 break;
1511 case R_ARM_PC24:
1512 case R_ARM_CALL:
1513 case R_ARM_JUMP24:
1514 /* From ARM ABI: ((S + A) | T) - P */
1515 r->r_addend = (int)(long)(elf->hdr +
1516 sechdr->sh_offset +
1517 (r->r_offset - sechdr->sh_addr));
1518 break;
1519 default:
1520 return 1;
1521 }
1522 return 0;
1523 }
1524
1525 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1526 {
1527 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1528 unsigned int *location = reloc_location(elf, sechdr, r);
1529 unsigned int inst;
1530
1531 if (r_typ == R_MIPS_HI16)
1532 return 1; /* skip this */
1533 inst = TO_NATIVE(*location);
1534 switch (r_typ) {
1535 case R_MIPS_LO16:
1536 r->r_addend = inst & 0xffff;
1537 break;
1538 case R_MIPS_26:
1539 r->r_addend = (inst & 0x03ffffff) << 2;
1540 break;
1541 case R_MIPS_32:
1542 r->r_addend = inst;
1543 break;
1544 }
1545 return 0;
1546 }
1547
1548 static void section_rela(const char *modname, struct elf_info *elf,
1549 Elf_Shdr *sechdr)
1550 {
1551 Elf_Sym *sym;
1552 Elf_Rela *rela;
1553 Elf_Rela r;
1554 unsigned int r_sym;
1555 const char *fromsec;
1556
1557 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1558 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1559
1560 fromsec = sech_name(elf, sechdr);
1561 fromsec += strlen(".rela");
1562 /* if from section (name) is know good then skip it */
1563 if (match(fromsec, section_white_list))
1564 return;
1565
1566 for (rela = start; rela < stop; rela++) {
1567 r.r_offset = TO_NATIVE(rela->r_offset);
1568 #if KERNEL_ELFCLASS == ELFCLASS64
1569 if (elf->hdr->e_machine == EM_MIPS) {
1570 unsigned int r_typ;
1571 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1572 r_sym = TO_NATIVE(r_sym);
1573 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1574 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1575 } else {
1576 r.r_info = TO_NATIVE(rela->r_info);
1577 r_sym = ELF_R_SYM(r.r_info);
1578 }
1579 #else
1580 r.r_info = TO_NATIVE(rela->r_info);
1581 r_sym = ELF_R_SYM(r.r_info);
1582 #endif
1583 r.r_addend = TO_NATIVE(rela->r_addend);
1584 sym = elf->symtab_start + r_sym;
1585 /* Skip special sections */
1586 if (is_shndx_special(sym->st_shndx))
1587 continue;
1588 check_section_mismatch(modname, elf, &r, sym, fromsec);
1589 }
1590 }
1591
1592 static void section_rel(const char *modname, struct elf_info *elf,
1593 Elf_Shdr *sechdr)
1594 {
1595 Elf_Sym *sym;
1596 Elf_Rel *rel;
1597 Elf_Rela r;
1598 unsigned int r_sym;
1599 const char *fromsec;
1600
1601 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1602 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1603
1604 fromsec = sech_name(elf, sechdr);
1605 fromsec += strlen(".rel");
1606 /* if from section (name) is know good then skip it */
1607 if (match(fromsec, section_white_list))
1608 return;
1609
1610 for (rel = start; rel < stop; rel++) {
1611 r.r_offset = TO_NATIVE(rel->r_offset);
1612 #if KERNEL_ELFCLASS == ELFCLASS64
1613 if (elf->hdr->e_machine == EM_MIPS) {
1614 unsigned int r_typ;
1615 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1616 r_sym = TO_NATIVE(r_sym);
1617 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1618 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1619 } else {
1620 r.r_info = TO_NATIVE(rel->r_info);
1621 r_sym = ELF_R_SYM(r.r_info);
1622 }
1623 #else
1624 r.r_info = TO_NATIVE(rel->r_info);
1625 r_sym = ELF_R_SYM(r.r_info);
1626 #endif
1627 r.r_addend = 0;
1628 switch (elf->hdr->e_machine) {
1629 case EM_386:
1630 if (addend_386_rel(elf, sechdr, &r))
1631 continue;
1632 break;
1633 case EM_ARM:
1634 if (addend_arm_rel(elf, sechdr, &r))
1635 continue;
1636 break;
1637 case EM_MIPS:
1638 if (addend_mips_rel(elf, sechdr, &r))
1639 continue;
1640 break;
1641 }
1642 sym = elf->symtab_start + r_sym;
1643 /* Skip special sections */
1644 if (is_shndx_special(sym->st_shndx))
1645 continue;
1646 check_section_mismatch(modname, elf, &r, sym, fromsec);
1647 }
1648 }
1649
1650 /**
1651 * A module includes a number of sections that are discarded
1652 * either when loaded or when used as built-in.
1653 * For loaded modules all functions marked __init and all data
1654 * marked __initdata will be discarded when the module has been initialized.
1655 * Likewise for modules used built-in the sections marked __exit
1656 * are discarded because __exit marked function are supposed to be called
1657 * only when a module is unloaded which never happens for built-in modules.
1658 * The check_sec_ref() function traverses all relocation records
1659 * to find all references to a section that reference a section that will
1660 * be discarded and warns about it.
1661 **/
1662 static void check_sec_ref(struct module *mod, const char *modname,
1663 struct elf_info *elf)
1664 {
1665 int i;
1666 Elf_Shdr *sechdrs = elf->sechdrs;
1667
1668 /* Walk through all sections */
1669 for (i = 0; i < elf->num_sections; i++) {
1670 check_section(modname, elf, &elf->sechdrs[i]);
1671 /* We want to process only relocation sections and not .init */
1672 if (sechdrs[i].sh_type == SHT_RELA)
1673 section_rela(modname, elf, &elf->sechdrs[i]);
1674 else if (sechdrs[i].sh_type == SHT_REL)
1675 section_rel(modname, elf, &elf->sechdrs[i]);
1676 }
1677 }
1678
1679 static void read_symbols(char *modname)
1680 {
1681 const char *symname;
1682 char *version;
1683 char *license;
1684 struct module *mod;
1685 struct elf_info info = { };
1686 Elf_Sym *sym;
1687
1688 if (!parse_elf(&info, modname))
1689 return;
1690
1691 mod = new_module(modname);
1692
1693 /* When there's no vmlinux, don't print warnings about
1694 * unresolved symbols (since there'll be too many ;) */
1695 if (is_vmlinux(modname)) {
1696 have_vmlinux = 1;
1697 mod->skip = 1;
1698 }
1699
1700 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1701 if (info.modinfo && !license && !is_vmlinux(modname))
1702 warn("modpost: missing MODULE_LICENSE() in %s\n"
1703 "see include/linux/module.h for "
1704 "more information\n", modname);
1705 while (license) {
1706 if (license_is_gpl_compatible(license))
1707 mod->gpl_compatible = 1;
1708 else {
1709 mod->gpl_compatible = 0;
1710 break;
1711 }
1712 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1713 "license", license);
1714 }
1715
1716 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1717 symname = info.strtab + sym->st_name;
1718
1719 handle_modversions(mod, &info, sym, symname);
1720 handle_moddevtable(mod, &info, sym, symname);
1721 }
1722 if (!is_vmlinux(modname) ||
1723 (is_vmlinux(modname) && vmlinux_section_warnings))
1724 check_sec_ref(mod, modname, &info);
1725
1726 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1727 if (version)
1728 maybe_frob_rcs_version(modname, version, info.modinfo,
1729 version - (char *)info.hdr);
1730 if (version || (all_versions && !is_vmlinux(modname)))
1731 get_src_version(modname, mod->srcversion,
1732 sizeof(mod->srcversion)-1);
1733
1734 parse_elf_finish(&info);
1735
1736 /* Our trick to get versioning for module struct etc. - it's
1737 * never passed as an argument to an exported function, so
1738 * the automatic versioning doesn't pick it up, but it's really
1739 * important anyhow */
1740 if (modversions)
1741 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1742 }
1743
1744 static void read_symbols_from_files(const char *filename)
1745 {
1746 FILE *in = stdin;
1747 char fname[PATH_MAX];
1748
1749 if (strcmp(filename, "-") != 0) {
1750 in = fopen(filename, "r");
1751 if (!in)
1752 fatal("Can't open filenames file %s: %m", filename);
1753 }
1754
1755 while (fgets(fname, PATH_MAX, in) != NULL) {
1756 if (strends(fname, "\n"))
1757 fname[strlen(fname)-1] = '\0';
1758 read_symbols(fname);
1759 }
1760
1761 if (in != stdin)
1762 fclose(in);
1763 }
1764
1765 #define SZ 500
1766
1767 /* We first write the generated file into memory using the
1768 * following helper, then compare to the file on disk and
1769 * only update the later if anything changed */
1770
1771 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1772 const char *fmt, ...)
1773 {
1774 char tmp[SZ];
1775 int len;
1776 va_list ap;
1777
1778 va_start(ap, fmt);
1779 len = vsnprintf(tmp, SZ, fmt, ap);
1780 buf_write(buf, tmp, len);
1781 va_end(ap);
1782 }
1783
1784 void buf_write(struct buffer *buf, const char *s, int len)
1785 {
1786 if (buf->size - buf->pos < len) {
1787 buf->size += len + SZ;
1788 buf->p = realloc(buf->p, buf->size);
1789 }
1790 strncpy(buf->p + buf->pos, s, len);
1791 buf->pos += len;
1792 }
1793
1794 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1795 {
1796 const char *e = is_vmlinux(m) ?"":".ko";
1797
1798 switch (exp) {
1799 case export_gpl:
1800 fatal("modpost: GPL-incompatible module %s%s "
1801 "uses GPL-only symbol '%s'\n", m, e, s);
1802 break;
1803 case export_unused_gpl:
1804 fatal("modpost: GPL-incompatible module %s%s "
1805 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1806 break;
1807 case export_gpl_future:
1808 warn("modpost: GPL-incompatible module %s%s "
1809 "uses future GPL-only symbol '%s'\n", m, e, s);
1810 break;
1811 case export_plain:
1812 case export_unused:
1813 case export_unknown:
1814 /* ignore */
1815 break;
1816 }
1817 }
1818
1819 static void check_for_unused(enum export exp, const char *m, const char *s)
1820 {
1821 const char *e = is_vmlinux(m) ?"":".ko";
1822
1823 switch (exp) {
1824 case export_unused:
1825 case export_unused_gpl:
1826 warn("modpost: module %s%s "
1827 "uses symbol '%s' marked UNUSED\n", m, e, s);
1828 break;
1829 default:
1830 /* ignore */
1831 break;
1832 }
1833 }
1834
1835 static void check_exports(struct module *mod)
1836 {
1837 struct symbol *s, *exp;
1838
1839 for (s = mod->unres; s; s = s->next) {
1840 const char *basename;
1841 exp = find_symbol(s->name);
1842 if (!exp || exp->module == mod)
1843 continue;
1844 basename = strrchr(mod->name, '/');
1845 if (basename)
1846 basename++;
1847 else
1848 basename = mod->name;
1849 if (!mod->gpl_compatible)
1850 check_for_gpl_usage(exp->export, basename, exp->name);
1851 check_for_unused(exp->export, basename, exp->name);
1852 }
1853 }
1854
1855 /**
1856 * Header for the generated file
1857 **/
1858 static void add_header(struct buffer *b, struct module *mod)
1859 {
1860 buf_printf(b, "#include <linux/module.h>\n");
1861 buf_printf(b, "#include <linux/vermagic.h>\n");
1862 buf_printf(b, "#include <linux/compiler.h>\n");
1863 buf_printf(b, "\n");
1864 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1865 buf_printf(b, "\n");
1866 buf_printf(b, "__visible struct module __this_module\n");
1867 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1868 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
1869 if (mod->has_init)
1870 buf_printf(b, "\t.init = init_module,\n");
1871 if (mod->has_cleanup)
1872 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1873 "\t.exit = cleanup_module,\n"
1874 "#endif\n");
1875 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
1876 buf_printf(b, "};\n");
1877 }
1878
1879 static void add_intree_flag(struct buffer *b, int is_intree)
1880 {
1881 if (is_intree)
1882 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
1883 }
1884
1885 static void add_staging_flag(struct buffer *b, const char *name)
1886 {
1887 static const char *staging_dir = "drivers/staging";
1888
1889 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1890 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1891 }
1892
1893 /**
1894 * Record CRCs for unresolved symbols
1895 **/
1896 static int add_versions(struct buffer *b, struct module *mod)
1897 {
1898 struct symbol *s, *exp;
1899 int err = 0;
1900
1901 for (s = mod->unres; s; s = s->next) {
1902 exp = find_symbol(s->name);
1903 if (!exp || exp->module == mod) {
1904 if (have_vmlinux && !s->weak) {
1905 if (warn_unresolved) {
1906 warn("\"%s\" [%s.ko] undefined!\n",
1907 s->name, mod->name);
1908 } else {
1909 merror("\"%s\" [%s.ko] undefined!\n",
1910 s->name, mod->name);
1911 err = 1;
1912 }
1913 }
1914 continue;
1915 }
1916 s->module = exp->module;
1917 s->crc_valid = exp->crc_valid;
1918 s->crc = exp->crc;
1919 }
1920
1921 if (!modversions)
1922 return err;
1923
1924 buf_printf(b, "\n");
1925 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1926 buf_printf(b, "__used\n");
1927 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1928
1929 for (s = mod->unres; s; s = s->next) {
1930 if (!s->module)
1931 continue;
1932 if (!s->crc_valid) {
1933 warn("\"%s\" [%s.ko] has no CRC!\n",
1934 s->name, mod->name);
1935 continue;
1936 }
1937 buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
1938 s->crc, s->name);
1939 }
1940
1941 buf_printf(b, "};\n");
1942
1943 return err;
1944 }
1945
1946 static void add_depends(struct buffer *b, struct module *mod,
1947 struct module *modules)
1948 {
1949 struct symbol *s;
1950 struct module *m;
1951 int first = 1;
1952
1953 for (m = modules; m; m = m->next)
1954 m->seen = is_vmlinux(m->name);
1955
1956 buf_printf(b, "\n");
1957 buf_printf(b, "static const char __module_depends[]\n");
1958 buf_printf(b, "__used\n");
1959 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1960 buf_printf(b, "\"depends=");
1961 for (s = mod->unres; s; s = s->next) {
1962 const char *p;
1963 if (!s->module)
1964 continue;
1965
1966 if (s->module->seen)
1967 continue;
1968
1969 s->module->seen = 1;
1970 p = strrchr(s->module->name, '/');
1971 if (p)
1972 p++;
1973 else
1974 p = s->module->name;
1975 buf_printf(b, "%s%s", first ? "" : ",", p);
1976 first = 0;
1977 }
1978 buf_printf(b, "\";\n");
1979 }
1980
1981 static void add_srcversion(struct buffer *b, struct module *mod)
1982 {
1983 if (mod->srcversion[0]) {
1984 buf_printf(b, "\n");
1985 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1986 mod->srcversion);
1987 }
1988 }
1989
1990 static void write_if_changed(struct buffer *b, const char *fname)
1991 {
1992 char *tmp;
1993 FILE *file;
1994 struct stat st;
1995
1996 file = fopen(fname, "r");
1997 if (!file)
1998 goto write;
1999
2000 if (fstat(fileno(file), &st) < 0)
2001 goto close_write;
2002
2003 if (st.st_size != b->pos)
2004 goto close_write;
2005
2006 tmp = NOFAIL(malloc(b->pos));
2007 if (fread(tmp, 1, b->pos, file) != b->pos)
2008 goto free_write;
2009
2010 if (memcmp(tmp, b->p, b->pos) != 0)
2011 goto free_write;
2012
2013 free(tmp);
2014 fclose(file);
2015 return;
2016
2017 free_write:
2018 free(tmp);
2019 close_write:
2020 fclose(file);
2021 write:
2022 file = fopen(fname, "w");
2023 if (!file) {
2024 perror(fname);
2025 exit(1);
2026 }
2027 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2028 perror(fname);
2029 exit(1);
2030 }
2031 fclose(file);
2032 }
2033
2034 /* parse Module.symvers file. line format:
2035 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2036 **/
2037 static void read_dump(const char *fname, unsigned int kernel)
2038 {
2039 unsigned long size, pos = 0;
2040 void *file = grab_file(fname, &size);
2041 char *line;
2042
2043 if (!file)
2044 /* No symbol versions, silently ignore */
2045 return;
2046
2047 while ((line = get_next_line(&pos, file, size))) {
2048 char *symname, *modname, *d, *export, *end;
2049 unsigned int crc;
2050 struct module *mod;
2051 struct symbol *s;
2052
2053 if (!(symname = strchr(line, '\t')))
2054 goto fail;
2055 *symname++ = '\0';
2056 if (!(modname = strchr(symname, '\t')))
2057 goto fail;
2058 *modname++ = '\0';
2059 if ((export = strchr(modname, '\t')) != NULL)
2060 *export++ = '\0';
2061 if (export && ((end = strchr(export, '\t')) != NULL))
2062 *end = '\0';
2063 crc = strtoul(line, &d, 16);
2064 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2065 goto fail;
2066 mod = find_module(modname);
2067 if (!mod) {
2068 if (is_vmlinux(modname))
2069 have_vmlinux = 1;
2070 mod = new_module(modname);
2071 mod->skip = 1;
2072 }
2073 s = sym_add_exported(symname, mod, export_no(export));
2074 s->kernel = kernel;
2075 s->preloaded = 1;
2076 sym_update_crc(symname, mod, crc, export_no(export));
2077 }
2078 return;
2079 fail:
2080 fatal("parse error in symbol dump file\n");
2081 }
2082
2083 /* For normal builds always dump all symbols.
2084 * For external modules only dump symbols
2085 * that are not read from kernel Module.symvers.
2086 **/
2087 static int dump_sym(struct symbol *sym)
2088 {
2089 if (!external_module)
2090 return 1;
2091 if (sym->vmlinux || sym->kernel)
2092 return 0;
2093 return 1;
2094 }
2095
2096 static void write_dump(const char *fname)
2097 {
2098 struct buffer buf = { };
2099 struct symbol *symbol;
2100 int n;
2101
2102 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2103 symbol = symbolhash[n];
2104 while (symbol) {
2105 if (dump_sym(symbol))
2106 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2107 symbol->crc, symbol->name,
2108 symbol->module->name,
2109 export_str(symbol->export));
2110 symbol = symbol->next;
2111 }
2112 }
2113 write_if_changed(&buf, fname);
2114 }
2115
2116 struct ext_sym_list {
2117 struct ext_sym_list *next;
2118 const char *file;
2119 };
2120
2121 int main(int argc, char **argv)
2122 {
2123 struct module *mod;
2124 struct buffer buf = { };
2125 char *kernel_read = NULL, *module_read = NULL;
2126 char *dump_write = NULL, *files_source = NULL;
2127 int opt;
2128 int err;
2129 struct ext_sym_list *extsym_iter;
2130 struct ext_sym_list *extsym_start = NULL;
2131
2132 while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:")) != -1) {
2133 switch (opt) {
2134 case 'i':
2135 kernel_read = optarg;
2136 break;
2137 case 'I':
2138 module_read = optarg;
2139 external_module = 1;
2140 break;
2141 case 'e':
2142 external_module = 1;
2143 extsym_iter =
2144 NOFAIL(malloc(sizeof(*extsym_iter)));
2145 extsym_iter->next = extsym_start;
2146 extsym_iter->file = optarg;
2147 extsym_start = extsym_iter;
2148 break;
2149 case 'm':
2150 modversions = 1;
2151 break;
2152 case 'n':
2153 ignore_missing_files = 1;
2154 break;
2155 case 'o':
2156 dump_write = optarg;
2157 break;
2158 case 'a':
2159 all_versions = 1;
2160 break;
2161 case 's':
2162 vmlinux_section_warnings = 0;
2163 break;
2164 case 'S':
2165 sec_mismatch_verbose = 0;
2166 break;
2167 case 'T':
2168 files_source = optarg;
2169 break;
2170 case 'w':
2171 warn_unresolved = 1;
2172 break;
2173 default:
2174 exit(1);
2175 }
2176 }
2177
2178 if (kernel_read)
2179 read_dump(kernel_read, 1);
2180 if (module_read)
2181 read_dump(module_read, 0);
2182 while (extsym_start) {
2183 read_dump(extsym_start->file, 0);
2184 extsym_iter = extsym_start->next;
2185 free(extsym_start);
2186 extsym_start = extsym_iter;
2187 }
2188
2189 while (optind < argc)
2190 read_symbols(argv[optind++]);
2191
2192 if (files_source)
2193 read_symbols_from_files(files_source);
2194
2195 for (mod = modules; mod; mod = mod->next) {
2196 if (mod->skip)
2197 continue;
2198 check_exports(mod);
2199 }
2200
2201 err = 0;
2202
2203 for (mod = modules; mod; mod = mod->next) {
2204 char fname[strlen(mod->name) + 10];
2205
2206 if (mod->skip)
2207 continue;
2208
2209 buf.pos = 0;
2210
2211 add_header(&buf, mod);
2212 add_intree_flag(&buf, !external_module);
2213 add_staging_flag(&buf, mod->name);
2214 err |= add_versions(&buf, mod);
2215 add_depends(&buf, mod, modules);
2216 add_moddevtable(&buf, mod);
2217 add_srcversion(&buf, mod);
2218
2219 sprintf(fname, "%s.mod.c", mod->name);
2220 write_if_changed(&buf, fname);
2221 }
2222
2223 if (dump_write)
2224 write_dump(dump_write);
2225 if (sec_mismatch_count && !sec_mismatch_verbose)
2226 warn("modpost: Found %d section mismatch(es).\n"
2227 "To see full details build your kernel with:\n"
2228 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2229 sec_mismatch_count);
2230
2231 return err;
2232 }
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