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Linux 3.12.39
[linux/fpc-iii.git] / scripts / mod / modpost.c
blob78c2169a4f59a9e6d3603c52a2d1835ffad5e390
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
6 * Based in part on module-init-tools/depmod.c,file2alias
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * Usage: modpost vmlinux module1.o module2.o ...
12 */
13
14 #define _GNU_SOURCE
15 #include <stdio.h>
16 #include <ctype.h>
17 #include <string.h>
18 #include <limits.h>
19 #include <stdbool.h>
20 #include "modpost.h"
21 #include "../../include/generated/autoconf.h"
22 #include "../../include/linux/license.h"
23 #include "../../include/linux/export.h"
24
25 /* Are we using CONFIG_MODVERSIONS? */
26 int modversions = 0;
27 /* Warn about undefined symbols? (do so if we have vmlinux) */
28 int have_vmlinux = 0;
29 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
30 static int all_versions = 0;
31 /* If we are modposting external module set to 1 */
32 static int external_module = 0;
33 /* Warn about section mismatch in vmlinux if set to 1 */
34 static int vmlinux_section_warnings = 1;
35 /* Only warn about unresolved symbols */
36 static int warn_unresolved = 0;
37 /* How a symbol is exported */
38 static int sec_mismatch_count = 0;
39 static int sec_mismatch_verbose = 1;
40
41 enum export {
42 export_plain, export_unused, export_gpl,
43 export_unused_gpl, export_gpl_future, export_unknown
44 };
45
46 #define PRINTF __attribute__ ((format (printf, 1, 2)))
47
48 PRINTF void fatal(const char *fmt, ...)
49 {
50 va_list arglist;
51
52 fprintf(stderr, "FATAL: ");
53
54 va_start(arglist, fmt);
55 vfprintf(stderr, fmt, arglist);
56 va_end(arglist);
57
58 exit(1);
59 }
60
61 PRINTF void warn(const char *fmt, ...)
62 {
63 va_list arglist;
64
65 fprintf(stderr, "WARNING: ");
66
67 va_start(arglist, fmt);
68 vfprintf(stderr, fmt, arglist);
69 va_end(arglist);
70 }
71
72 PRINTF void merror(const char *fmt, ...)
73 {
74 va_list arglist;
75
76 fprintf(stderr, "ERROR: ");
77
78 va_start(arglist, fmt);
79 vfprintf(stderr, fmt, arglist);
80 va_end(arglist);
81 }
82
83 static inline bool strends(const char *str, const char *postfix)
84 {
85 if (strlen(str) < strlen(postfix))
86 return false;
87
88 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
89 }
90
91 static int is_vmlinux(const char *modname)
92 {
93 const char *myname;
94
95 myname = strrchr(modname, '/');
96 if (myname)
97 myname++;
98 else
99 myname = modname;
100
101 return (strcmp(myname, "vmlinux") == 0) ||
102 (strcmp(myname, "vmlinux.o") == 0);
103 }
104
105 void *do_nofail(void *ptr, const char *expr)
106 {
107 if (!ptr)
108 fatal("modpost: Memory allocation failure: %s.\n", expr);
109
110 return ptr;
111 }
112
113 /* A list of all modules we processed */
114 static struct module *modules;
115
116 static struct module *find_module(char *modname)
117 {
118 struct module *mod;
119
120 for (mod = modules; mod; mod = mod->next)
121 if (strcmp(mod->name, modname) == 0)
122 break;
123 return mod;
124 }
125
126 static struct module *new_module(const char *modname)
127 {
128 struct module *mod;
129 char *p;
130
131 mod = NOFAIL(malloc(sizeof(*mod)));
132 memset(mod, 0, sizeof(*mod));
133 p = NOFAIL(strdup(modname));
134
135 /* strip trailing .o */
136 if (strends(p, ".o")) {
137 p[strlen(p) - 2] = '\0';
138 mod->is_dot_o = 1;
139 }
140
141 /* add to list */
142 mod->name = p;
143 mod->gpl_compatible = -1;
144 mod->next = modules;
145 modules = mod;
146
147 return mod;
148 }
149
150 /* A hash of all exported symbols,
151 * struct symbol is also used for lists of unresolved symbols */
152
153 #define SYMBOL_HASH_SIZE 1024
154
155 struct symbol {
156 struct symbol *next;
157 struct module *module;
158 unsigned int crc;
159 int crc_valid;
160 unsigned int weak:1;
161 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
162 unsigned int kernel:1; /* 1 if symbol is from kernel
163 * (only for external modules) **/
164 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
165 enum export export; /* Type of export */
166 char name[0];
167 };
168
169 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
170
171 /* This is based on the hash agorithm from gdbm, via tdb */
172 static inline unsigned int tdb_hash(const char *name)
173 {
174 unsigned value; /* Used to compute the hash value. */
175 unsigned i; /* Used to cycle through random values. */
176
177 /* Set the initial value from the key size. */
178 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
179 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
180
181 return (1103515243 * value + 12345);
182 }
183
184 /**
185 * Allocate a new symbols for use in the hash of exported symbols or
186 * the list of unresolved symbols per module
187 **/
188 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
189 struct symbol *next)
190 {
191 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
192
193 memset(s, 0, sizeof(*s));
194 strcpy(s->name, name);
195 s->weak = weak;
196 s->next = next;
197 return s;
198 }
199
200 /* For the hash of exported symbols */
201 static struct symbol *new_symbol(const char *name, struct module *module,
202 enum export export)
203 {
204 unsigned int hash;
205 struct symbol *new;
206
207 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
208 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
209 new->module = module;
210 new->export = export;
211 return new;
212 }
213
214 static struct symbol *find_symbol(const char *name)
215 {
216 struct symbol *s;
217
218 /* For our purposes, .foo matches foo. PPC64 needs this. */
219 if (name[0] == '.')
220 name++;
221
222 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
223 if (strcmp(s->name, name) == 0)
224 return s;
225 }
226 return NULL;
227 }
228
229 static struct {
230 const char *str;
231 enum export export;
232 } export_list[] = {
233 { .str = "EXPORT_SYMBOL", .export = export_plain },
234 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
235 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
236 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
237 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
238 { .str = "(unknown)", .export = export_unknown },
239 };
240
241
242 static const char *export_str(enum export ex)
243 {
244 return export_list[ex].str;
245 }
246
247 static enum export export_no(const char *s)
248 {
249 int i;
250
251 if (!s)
252 return export_unknown;
253 for (i = 0; export_list[i].export != export_unknown; i++) {
254 if (strcmp(export_list[i].str, s) == 0)
255 return export_list[i].export;
256 }
257 return export_unknown;
258 }
259
260 static const char *sec_name(struct elf_info *elf, int secindex);
261
262 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
263
264 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
265 {
266 const char *secname = sec_name(elf, sec);
267
268 if (strstarts(secname, "___ksymtab+"))
269 return export_plain;
270 else if (strstarts(secname, "___ksymtab_unused+"))
271 return export_unused;
272 else if (strstarts(secname, "___ksymtab_gpl+"))
273 return export_gpl;
274 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
275 return export_unused_gpl;
276 else if (strstarts(secname, "___ksymtab_gpl_future+"))
277 return export_gpl_future;
278 else
279 return export_unknown;
280 }
281
282 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
283 {
284 if (sec == elf->export_sec)
285 return export_plain;
286 else if (sec == elf->export_unused_sec)
287 return export_unused;
288 else if (sec == elf->export_gpl_sec)
289 return export_gpl;
290 else if (sec == elf->export_unused_gpl_sec)
291 return export_unused_gpl;
292 else if (sec == elf->export_gpl_future_sec)
293 return export_gpl_future;
294 else
295 return export_unknown;
296 }
297
298 /**
299 * Add an exported symbol - it may have already been added without a
300 * CRC, in this case just update the CRC
301 **/
302 static struct symbol *sym_add_exported(const char *name, struct module *mod,
303 enum export export)
304 {
305 struct symbol *s = find_symbol(name);
306
307 if (!s) {
308 s = new_symbol(name, mod, export);
309 } else {
310 if (!s->preloaded) {
311 warn("%s: '%s' exported twice. Previous export "
312 "was in %s%s\n", mod->name, name,
313 s->module->name,
314 is_vmlinux(s->module->name) ?"":".ko");
315 } else {
316 /* In case Modules.symvers was out of date */
317 s->module = mod;
318 }
319 }
320 s->preloaded = 0;
321 s->vmlinux = is_vmlinux(mod->name);
322 s->kernel = 0;
323 s->export = export;
324 return s;
325 }
326
327 static void sym_update_crc(const char *name, struct module *mod,
328 unsigned int crc, enum export export)
329 {
330 struct symbol *s = find_symbol(name);
331
332 if (!s)
333 s = new_symbol(name, mod, export);
334 s->crc = crc;
335 s->crc_valid = 1;
336 }
337
338 void *grab_file(const char *filename, unsigned long *size)
339 {
340 struct stat st;
341 void *map = MAP_FAILED;
342 int fd;
343
344 fd = open(filename, O_RDONLY);
345 if (fd < 0)
346 return NULL;
347 if (fstat(fd, &st))
348 goto failed;
349
350 *size = st.st_size;
351 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
352
353 failed:
354 close(fd);
355 if (map == MAP_FAILED)
356 return NULL;
357 return map;
358 }
359
360 /**
361 * Return a copy of the next line in a mmap'ed file.
362 * spaces in the beginning of the line is trimmed away.
363 * Return a pointer to a static buffer.
364 **/
365 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
366 {
367 static char line[4096];
368 int skip = 1;
369 size_t len = 0;
370 signed char *p = (signed char *)file + *pos;
371 char *s = line;
372
373 for (; *pos < size ; (*pos)++) {
374 if (skip && isspace(*p)) {
375 p++;
376 continue;
377 }
378 skip = 0;
379 if (*p != '\n' && (*pos < size)) {
380 len++;
381 *s++ = *p++;
382 if (len > 4095)
383 break; /* Too long, stop */
384 } else {
385 /* End of string */
386 *s = '\0';
387 return line;
388 }
389 }
390 /* End of buffer */
391 return NULL;
392 }
393
394 void release_file(void *file, unsigned long size)
395 {
396 munmap(file, size);
397 }
398
399 static int parse_elf(struct elf_info *info, const char *filename)
400 {
401 unsigned int i;
402 Elf_Ehdr *hdr;
403 Elf_Shdr *sechdrs;
404 Elf_Sym *sym;
405 const char *secstrings;
406 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
407
408 hdr = grab_file(filename, &info->size);
409 if (!hdr) {
410 perror(filename);
411 exit(1);
412 }
413 info->hdr = hdr;
414 if (info->size < sizeof(*hdr)) {
415 /* file too small, assume this is an empty .o file */
416 return 0;
417 }
418 /* Is this a valid ELF file? */
419 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
420 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
421 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
422 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
423 /* Not an ELF file - silently ignore it */
424 return 0;
425 }
426 /* Fix endianness in ELF header */
427 hdr->e_type = TO_NATIVE(hdr->e_type);
428 hdr->e_machine = TO_NATIVE(hdr->e_machine);
429 hdr->e_version = TO_NATIVE(hdr->e_version);
430 hdr->e_entry = TO_NATIVE(hdr->e_entry);
431 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
432 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
433 hdr->e_flags = TO_NATIVE(hdr->e_flags);
434 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
435 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
436 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
437 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
438 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
439 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
440 sechdrs = (void *)hdr + hdr->e_shoff;
441 info->sechdrs = sechdrs;
442
443 /* Check if file offset is correct */
444 if (hdr->e_shoff > info->size) {
445 fatal("section header offset=%lu in file '%s' is bigger than "
446 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
447 filename, info->size);
448 return 0;
449 }
450
451 if (hdr->e_shnum == SHN_UNDEF) {
452 /*
453 * There are more than 64k sections,
454 * read count from .sh_size.
455 */
456 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
457 }
458 else {
459 info->num_sections = hdr->e_shnum;
460 }
461 if (hdr->e_shstrndx == SHN_XINDEX) {
462 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
463 }
464 else {
465 info->secindex_strings = hdr->e_shstrndx;
466 }
467
468 /* Fix endianness in section headers */
469 for (i = 0; i < info->num_sections; i++) {
470 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
471 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
472 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
473 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
474 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
475 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
476 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
477 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
478 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
479 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
480 }
481 /* Find symbol table. */
482 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
483 for (i = 1; i < info->num_sections; i++) {
484 const char *secname;
485 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
486
487 if (!nobits && sechdrs[i].sh_offset > info->size) {
488 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
489 "sizeof(*hrd)=%zu\n", filename,
490 (unsigned long)sechdrs[i].sh_offset,
491 sizeof(*hdr));
492 return 0;
493 }
494 secname = secstrings + sechdrs[i].sh_name;
495 if (strcmp(secname, ".modinfo") == 0) {
496 if (nobits)
497 fatal("%s has NOBITS .modinfo\n", filename);
498 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
499 info->modinfo_len = sechdrs[i].sh_size;
500 } else if (strcmp(secname, "__ksymtab") == 0)
501 info->export_sec = i;
502 else if (strcmp(secname, "__ksymtab_unused") == 0)
503 info->export_unused_sec = i;
504 else if (strcmp(secname, "__ksymtab_gpl") == 0)
505 info->export_gpl_sec = i;
506 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
507 info->export_unused_gpl_sec = i;
508 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
509 info->export_gpl_future_sec = i;
510
511 if (sechdrs[i].sh_type == SHT_SYMTAB) {
512 unsigned int sh_link_idx;
513 symtab_idx = i;
514 info->symtab_start = (void *)hdr +
515 sechdrs[i].sh_offset;
516 info->symtab_stop = (void *)hdr +
517 sechdrs[i].sh_offset + sechdrs[i].sh_size;
518 sh_link_idx = sechdrs[i].sh_link;
519 info->strtab = (void *)hdr +
520 sechdrs[sh_link_idx].sh_offset;
521 }
522
523 /* 32bit section no. table? ("more than 64k sections") */
524 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
525 symtab_shndx_idx = i;
526 info->symtab_shndx_start = (void *)hdr +
527 sechdrs[i].sh_offset;
528 info->symtab_shndx_stop = (void *)hdr +
529 sechdrs[i].sh_offset + sechdrs[i].sh_size;
530 }
531 }
532 if (!info->symtab_start)
533 fatal("%s has no symtab?\n", filename);
534
535 /* Fix endianness in symbols */
536 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
537 sym->st_shndx = TO_NATIVE(sym->st_shndx);
538 sym->st_name = TO_NATIVE(sym->st_name);
539 sym->st_value = TO_NATIVE(sym->st_value);
540 sym->st_size = TO_NATIVE(sym->st_size);
541 }
542
543 if (symtab_shndx_idx != ~0U) {
544 Elf32_Word *p;
545 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
546 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
547 filename, sechdrs[symtab_shndx_idx].sh_link,
548 symtab_idx);
549 /* Fix endianness */
550 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
551 p++)
552 *p = TO_NATIVE(*p);
553 }
554
555 return 1;
556 }
557
558 static void parse_elf_finish(struct elf_info *info)
559 {
560 release_file(info->hdr, info->size);
561 }
562
563 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
564 {
565 /* ignore __this_module, it will be resolved shortly */
566 if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
567 return 1;
568 /* ignore global offset table */
569 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
570 return 1;
571 if (info->hdr->e_machine == EM_PPC)
572 /* Special register function linked on all modules during final link of .ko */
573 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
574 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
575 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
576 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
577 strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
578 strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
579 return 1;
580 if (info->hdr->e_machine == EM_PPC64)
581 /* Special register function linked on all modules during final link of .ko */
582 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
583 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
584 strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
585 strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
586 return 1;
587 /* Do not ignore this symbol */
588 return 0;
589 }
590
591 #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
592 #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
593
594 static void handle_modversions(struct module *mod, struct elf_info *info,
595 Elf_Sym *sym, const char *symname)
596 {
597 unsigned int crc;
598 enum export export;
599
600 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
601 strncmp(symname, "__ksymtab", 9) == 0)
602 export = export_from_secname(info, get_secindex(info, sym));
603 else
604 export = export_from_sec(info, get_secindex(info, sym));
605
606 switch (sym->st_shndx) {
607 case SHN_COMMON:
608 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
609 break;
610 case SHN_ABS:
611 /* CRC'd symbol */
612 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
613 crc = (unsigned int) sym->st_value;
614 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
615 export);
616 }
617 break;
618 case SHN_UNDEF:
619 /* undefined symbol */
620 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
621 ELF_ST_BIND(sym->st_info) != STB_WEAK)
622 break;
623 if (ignore_undef_symbol(info, symname))
624 break;
625 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
626 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
627 /* add compatibility with older glibc */
628 #ifndef STT_SPARC_REGISTER
629 #define STT_SPARC_REGISTER STT_REGISTER
630 #endif
631 if (info->hdr->e_machine == EM_SPARC ||
632 info->hdr->e_machine == EM_SPARCV9) {
633 /* Ignore register directives. */
634 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
635 break;
636 if (symname[0] == '.') {
637 char *munged = strdup(symname);
638 munged[0] = '_';
639 munged[1] = toupper(munged[1]);
640 symname = munged;
641 }
642 }
643 #endif
644
645 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
646 if (symname[0] != '_')
647 break;
648 else
649 symname++;
650 #endif
651 mod->unres = alloc_symbol(symname,
652 ELF_ST_BIND(sym->st_info) == STB_WEAK,
653 mod->unres);
654 break;
655 default:
656 /* All exported symbols */
657 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
658 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
659 export);
660 }
661 if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
662 mod->has_init = 1;
663 if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
664 mod->has_cleanup = 1;
665 break;
666 }
667 }
668
669 /**
670 * Parse tag=value strings from .modinfo section
671 **/
672 static char *next_string(char *string, unsigned long *secsize)
673 {
674 /* Skip non-zero chars */
675 while (string[0]) {
676 string++;
677 if ((*secsize)-- <= 1)
678 return NULL;
679 }
680
681 /* Skip any zero padding. */
682 while (!string[0]) {
683 string++;
684 if ((*secsize)-- <= 1)
685 return NULL;
686 }
687 return string;
688 }
689
690 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
691 const char *tag, char *info)
692 {
693 char *p;
694 unsigned int taglen = strlen(tag);
695 unsigned long size = modinfo_len;
696
697 if (info) {
698 size -= info - (char *)modinfo;
699 modinfo = next_string(info, &size);
700 }
701
702 for (p = modinfo; p; p = next_string(p, &size)) {
703 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
704 return p + taglen + 1;
705 }
706 return NULL;
707 }
708
709 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
710 const char *tag)
711
712 {
713 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
714 }
715
716 /**
717 * Test if string s ends in string sub
718 * return 0 if match
719 **/
720 static int strrcmp(const char *s, const char *sub)
721 {
722 int slen, sublen;
723
724 if (!s || !sub)
725 return 1;
726
727 slen = strlen(s);
728 sublen = strlen(sub);
729
730 if ((slen == 0) || (sublen == 0))
731 return 1;
732
733 if (sublen > slen)
734 return 1;
735
736 return memcmp(s + slen - sublen, sub, sublen);
737 }
738
739 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
740 {
741 if (sym)
742 return elf->strtab + sym->st_name;
743 else
744 return "(unknown)";
745 }
746
747 static const char *sec_name(struct elf_info *elf, int secindex)
748 {
749 Elf_Shdr *sechdrs = elf->sechdrs;
750 return (void *)elf->hdr +
751 elf->sechdrs[elf->secindex_strings].sh_offset +
752 sechdrs[secindex].sh_name;
753 }
754
755 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
756 {
757 return (void *)elf->hdr +
758 elf->sechdrs[elf->secindex_strings].sh_offset +
759 sechdr->sh_name;
760 }
761
762 /* if sym is empty or point to a string
763 * like ".[0-9]+" then return 1.
764 * This is the optional prefix added by ld to some sections
765 */
766 static int number_prefix(const char *sym)
767 {
768 if (*sym++ == '\0')
769 return 1;
770 if (*sym != '.')
771 return 0;
772 do {
773 char c = *sym++;
774 if (c < '0' || c > '9')
775 return 0;
776 } while (*sym);
777 return 1;
778 }
779
780 /* The pattern is an array of simple patterns.
781 * "foo" will match an exact string equal to "foo"
782 * "*foo" will match a string that ends with "foo"
783 * "foo*" will match a string that begins with "foo"
784 * "foo$" will match a string equal to "foo" or "foo.1"
785 * where the '1' can be any number including several digits.
786 * The $ syntax is for sections where ld append a dot number
787 * to make section name unique.
788 */
789 static int match(const char *sym, const char * const pat[])
790 {
791 const char *p;
792 while (*pat) {
793 p = *pat++;
794 const char *endp = p + strlen(p) - 1;
795
796 /* "*foo" */
797 if (*p == '*') {
798 if (strrcmp(sym, p + 1) == 0)
799 return 1;
800 }
801 /* "foo*" */
802 else if (*endp == '*') {
803 if (strncmp(sym, p, strlen(p) - 1) == 0)
804 return 1;
805 }
806 /* "foo$" */
807 else if (*endp == '$') {
808 if (strncmp(sym, p, strlen(p) - 1) == 0) {
809 if (number_prefix(sym + strlen(p) - 1))
810 return 1;
811 }
812 }
813 /* no wildcards */
814 else {
815 if (strcmp(p, sym) == 0)
816 return 1;
817 }
818 }
819 /* no match */
820 return 0;
821 }
822
823 /* sections that we do not want to do full section mismatch check on */
824 static const char *section_white_list[] =
825 {
826 ".comment*",
827 ".debug*",
828 ".cranges", /* sh64 */
829 ".zdebug*", /* Compressed debug sections. */
830 ".GCC-command-line", /* mn10300 */
831 ".GCC.command.line", /* record-gcc-switches, non mn10300 */
832 ".mdebug*", /* alpha, score, mips etc. */
833 ".pdr", /* alpha, score, mips etc. */
834 ".stab*",
835 ".note*",
836 ".got*",
837 ".toc*",
838 ".xt.prop", /* xtensa */
839 ".xt.lit", /* xtensa */
840 ".arcextmap*", /* arc */
841 ".gnu.linkonce.arcext*", /* arc : modules */
842 NULL
843 };
844
845 /*
846 * This is used to find sections missing the SHF_ALLOC flag.
847 * The cause of this is often a section specified in assembler
848 * without "ax" / "aw".
849 */
850 static void check_section(const char *modname, struct elf_info *elf,
851 Elf_Shdr *sechdr)
852 {
853 const char *sec = sech_name(elf, sechdr);
854
855 if (sechdr->sh_type == SHT_PROGBITS &&
856 !(sechdr->sh_flags & SHF_ALLOC) &&
857 !match(sec, section_white_list)) {
858 warn("%s (%s): unexpected non-allocatable section.\n"
859 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
860 "Note that for example <linux/init.h> contains\n"
861 "section definitions for use in .S files.\n\n",
862 modname, sec);
863 }
864 }
865
866
867
868 #define ALL_INIT_DATA_SECTIONS \
869 ".init.setup$", ".init.rodata$", ".meminit.rodata$", \
870 ".init.data$", ".meminit.data$"
871 #define ALL_EXIT_DATA_SECTIONS \
872 ".exit.data$", ".memexit.data$"
873
874 #define ALL_INIT_TEXT_SECTIONS \
875 ".init.text$", ".meminit.text$"
876 #define ALL_EXIT_TEXT_SECTIONS \
877 ".exit.text$", ".memexit.text$"
878
879 #define ALL_PCI_INIT_SECTIONS \
880 ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
881 ".pci_fixup_enable$", ".pci_fixup_resume$", \
882 ".pci_fixup_resume_early$", ".pci_fixup_suspend$"
883
884 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
885 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
886
887 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
888 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
889
890 #define DATA_SECTIONS ".data$", ".data.rel$"
891 #define TEXT_SECTIONS ".text$", ".text.unlikely$"
892
893 #define INIT_SECTIONS ".init.*"
894 #define MEM_INIT_SECTIONS ".meminit.*"
895
896 #define EXIT_SECTIONS ".exit.*"
897 #define MEM_EXIT_SECTIONS ".memexit.*"
898
899 /* init data sections */
900 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
901
902 /* all init sections */
903 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
904
905 /* All init and exit sections (code + data) */
906 static const char *init_exit_sections[] =
907 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
908
909 /* data section */
910 static const char *data_sections[] = { DATA_SECTIONS, NULL };
911
912
913 /* symbols in .data that may refer to init/exit sections */
914 #define DEFAULT_SYMBOL_WHITE_LIST \
915 "*driver", \
916 "*_template", /* scsi uses *_template a lot */ \
917 "*_timer", /* arm uses ops structures named _timer a lot */ \
918 "*_sht", /* scsi also used *_sht to some extent */ \
919 "*_ops", \
920 "*_probe", \
921 "*_probe_one", \
922 "*_console"
923
924 static const char *head_sections[] = { ".head.text*", NULL };
925 static const char *linker_symbols[] =
926 { "__init_begin", "_sinittext", "_einittext", NULL };
927
928 enum mismatch {
929 TEXT_TO_ANY_INIT,
930 DATA_TO_ANY_INIT,
931 TEXT_TO_ANY_EXIT,
932 DATA_TO_ANY_EXIT,
933 XXXINIT_TO_SOME_INIT,
934 XXXEXIT_TO_SOME_EXIT,
935 ANY_INIT_TO_ANY_EXIT,
936 ANY_EXIT_TO_ANY_INIT,
937 EXPORT_TO_INIT_EXIT,
938 };
939
940 struct sectioncheck {
941 const char *fromsec[20];
942 const char *tosec[20];
943 enum mismatch mismatch;
944 const char *symbol_white_list[20];
945 };
946
947 const struct sectioncheck sectioncheck[] = {
948 /* Do not reference init/exit code/data from
949 * normal code and data
950 */
951 {
952 .fromsec = { TEXT_SECTIONS, NULL },
953 .tosec = { ALL_INIT_SECTIONS, NULL },
954 .mismatch = TEXT_TO_ANY_INIT,
955 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
956 },
957 {
958 .fromsec = { DATA_SECTIONS, NULL },
959 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
960 .mismatch = DATA_TO_ANY_INIT,
961 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
962 },
963 {
964 .fromsec = { DATA_SECTIONS, NULL },
965 .tosec = { INIT_SECTIONS, NULL },
966 .mismatch = DATA_TO_ANY_INIT,
967 .symbol_white_list = {
968 "*_template", "*_timer", "*_sht", "*_ops",
969 "*_probe", "*_probe_one", "*_console", NULL
970 },
971 },
972 {
973 .fromsec = { TEXT_SECTIONS, NULL },
974 .tosec = { ALL_EXIT_SECTIONS, NULL },
975 .mismatch = TEXT_TO_ANY_EXIT,
976 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
977 },
978 {
979 .fromsec = { DATA_SECTIONS, NULL },
980 .tosec = { ALL_EXIT_SECTIONS, NULL },
981 .mismatch = DATA_TO_ANY_EXIT,
982 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
983 },
984 /* Do not reference init code/data from meminit code/data */
985 {
986 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
987 .tosec = { INIT_SECTIONS, NULL },
988 .mismatch = XXXINIT_TO_SOME_INIT,
989 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
990 },
991 /* Do not reference exit code/data from memexit code/data */
992 {
993 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
994 .tosec = { EXIT_SECTIONS, NULL },
995 .mismatch = XXXEXIT_TO_SOME_EXIT,
996 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
997 },
998 /* Do not use exit code/data from init code */
999 {
1000 .fromsec = { ALL_INIT_SECTIONS, NULL },
1001 .tosec = { ALL_EXIT_SECTIONS, NULL },
1002 .mismatch = ANY_INIT_TO_ANY_EXIT,
1003 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1004 },
1005 /* Do not use init code/data from exit code */
1006 {
1007 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1008 .tosec = { ALL_INIT_SECTIONS, NULL },
1009 .mismatch = ANY_EXIT_TO_ANY_INIT,
1010 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1011 },
1012 {
1013 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1014 .tosec = { INIT_SECTIONS, NULL },
1015 .mismatch = ANY_INIT_TO_ANY_EXIT,
1016 .symbol_white_list = { NULL },
1017 },
1018 /* Do not export init/exit functions or data */
1019 {
1020 .fromsec = { "__ksymtab*", NULL },
1021 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1022 .mismatch = EXPORT_TO_INIT_EXIT,
1023 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1024 }
1025 };
1026
1027 static const struct sectioncheck *section_mismatch(
1028 const char *fromsec, const char *tosec)
1029 {
1030 int i;
1031 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1032 const struct sectioncheck *check = &sectioncheck[0];
1033
1034 for (i = 0; i < elems; i++) {
1035 if (match(fromsec, check->fromsec) &&
1036 match(tosec, check->tosec))
1037 return check;
1038 check++;
1039 }
1040 return NULL;
1041 }
1042
1043 /**
1044 * Whitelist to allow certain references to pass with no warning.
1045 *
1046 * Pattern 1:
1047 * If a module parameter is declared __initdata and permissions=0
1048 * then this is legal despite the warning generated.
1049 * We cannot see value of permissions here, so just ignore
1050 * this pattern.
1051 * The pattern is identified by:
1052 * tosec = .init.data
1053 * fromsec = .data*
1054 * atsym =__param*
1055 *
1056 * Pattern 1a:
1057 * module_param_call() ops can refer to __init set function if permissions=0
1058 * The pattern is identified by:
1059 * tosec = .init.text
1060 * fromsec = .data*
1061 * atsym = __param_ops_*
1062 *
1063 * Pattern 2:
1064 * Many drivers utilise a *driver container with references to
1065 * add, remove, probe functions etc.
1066 * the pattern is identified by:
1067 * tosec = init or exit section
1068 * fromsec = data section
1069 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1070 * *probe_one, *_console, *_timer
1071 *
1072 * Pattern 3:
1073 * Whitelist all references from .head.text to any init section
1074 *
1075 * Pattern 4:
1076 * Some symbols belong to init section but still it is ok to reference
1077 * these from non-init sections as these symbols don't have any memory
1078 * allocated for them and symbol address and value are same. So even
1079 * if init section is freed, its ok to reference those symbols.
1080 * For ex. symbols marking the init section boundaries.
1081 * This pattern is identified by
1082 * refsymname = __init_begin, _sinittext, _einittext
1083 *
1084 **/
1085 static int secref_whitelist(const struct sectioncheck *mismatch,
1086 const char *fromsec, const char *fromsym,
1087 const char *tosec, const char *tosym)
1088 {
1089 /* Check for pattern 1 */
1090 if (match(tosec, init_data_sections) &&
1091 match(fromsec, data_sections) &&
1092 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1093 return 0;
1094
1095 /* Check for pattern 1a */
1096 if (strcmp(tosec, ".init.text") == 0 &&
1097 match(fromsec, data_sections) &&
1098 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1099 return 0;
1100
1101 /* Check for pattern 2 */
1102 if (match(tosec, init_exit_sections) &&
1103 match(fromsec, data_sections) &&
1104 match(fromsym, mismatch->symbol_white_list))
1105 return 0;
1106
1107 /* Check for pattern 3 */
1108 if (match(fromsec, head_sections) &&
1109 match(tosec, init_sections))
1110 return 0;
1111
1112 /* Check for pattern 4 */
1113 if (match(tosym, linker_symbols))
1114 return 0;
1115
1116 return 1;
1117 }
1118
1119 /**
1120 * Find symbol based on relocation record info.
1121 * In some cases the symbol supplied is a valid symbol so
1122 * return refsym. If st_name != 0 we assume this is a valid symbol.
1123 * In other cases the symbol needs to be looked up in the symbol table
1124 * based on section and address.
1125 * **/
1126 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1127 Elf_Sym *relsym)
1128 {
1129 Elf_Sym *sym;
1130 Elf_Sym *near = NULL;
1131 Elf64_Sword distance = 20;
1132 Elf64_Sword d;
1133 unsigned int relsym_secindex;
1134
1135 if (relsym->st_name != 0)
1136 return relsym;
1137
1138 relsym_secindex = get_secindex(elf, relsym);
1139 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1140 if (get_secindex(elf, sym) != relsym_secindex)
1141 continue;
1142 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1143 continue;
1144 if (sym->st_value == addr)
1145 return sym;
1146 /* Find a symbol nearby - addr are maybe negative */
1147 d = sym->st_value - addr;
1148 if (d < 0)
1149 d = addr - sym->st_value;
1150 if (d < distance) {
1151 distance = d;
1152 near = sym;
1153 }
1154 }
1155 /* We need a close match */
1156 if (distance < 20)
1157 return near;
1158 else
1159 return NULL;
1160 }
1161
1162 static inline int is_arm_mapping_symbol(const char *str)
1163 {
1164 return str[0] == '$' && strchr("atd", str[1])
1165 && (str[2] == '\0' || str[2] == '.');
1166 }
1167
1168 /*
1169 * If there's no name there, ignore it; likewise, ignore it if it's
1170 * one of the magic symbols emitted used by current ARM tools.
1171 *
1172 * Otherwise if find_symbols_between() returns those symbols, they'll
1173 * fail the whitelist tests and cause lots of false alarms ... fixable
1174 * only by merging __exit and __init sections into __text, bloating
1175 * the kernel (which is especially evil on embedded platforms).
1176 */
1177 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1178 {
1179 const char *name = elf->strtab + sym->st_name;
1180
1181 if (!name || !strlen(name))
1182 return 0;
1183 return !is_arm_mapping_symbol(name);
1184 }
1185
1186 /*
1187 * Find symbols before or equal addr and after addr - in the section sec.
1188 * If we find two symbols with equal offset prefer one with a valid name.
1189 * The ELF format may have a better way to detect what type of symbol
1190 * it is, but this works for now.
1191 **/
1192 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1193 const char *sec)
1194 {
1195 Elf_Sym *sym;
1196 Elf_Sym *near = NULL;
1197 Elf_Addr distance = ~0;
1198
1199 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1200 const char *symsec;
1201
1202 if (is_shndx_special(sym->st_shndx))
1203 continue;
1204 symsec = sec_name(elf, get_secindex(elf, sym));
1205 if (strcmp(symsec, sec) != 0)
1206 continue;
1207 if (!is_valid_name(elf, sym))
1208 continue;
1209 if (sym->st_value <= addr) {
1210 if ((addr - sym->st_value) < distance) {
1211 distance = addr - sym->st_value;
1212 near = sym;
1213 } else if ((addr - sym->st_value) == distance) {
1214 near = sym;
1215 }
1216 }
1217 }
1218 return near;
1219 }
1220
1221 /*
1222 * Convert a section name to the function/data attribute
1223 * .init.text => __init
1224 * .memexitconst => __memconst
1225 * etc.
1226 *
1227 * The memory of returned value has been allocated on a heap. The user of this
1228 * method should free it after usage.
1229 */
1230 static char *sec2annotation(const char *s)
1231 {
1232 if (match(s, init_exit_sections)) {
1233 char *p = malloc(20);
1234 char *r = p;
1235
1236 *p++ = '_';
1237 *p++ = '_';
1238 if (*s == '.')
1239 s++;
1240 while (*s && *s != '.')
1241 *p++ = *s++;
1242 *p = '\0';
1243 if (*s == '.')
1244 s++;
1245 if (strstr(s, "rodata") != NULL)
1246 strcat(p, "const ");
1247 else if (strstr(s, "data") != NULL)
1248 strcat(p, "data ");
1249 else
1250 strcat(p, " ");
1251 return r;
1252 } else {
1253 return strdup("");
1254 }
1255 }
1256
1257 static int is_function(Elf_Sym *sym)
1258 {
1259 if (sym)
1260 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1261 else
1262 return -1;
1263 }
1264
1265 static void print_section_list(const char * const list[20])
1266 {
1267 const char *const *s = list;
1268
1269 while (*s) {
1270 fprintf(stderr, "%s", *s);
1271 s++;
1272 if (*s)
1273 fprintf(stderr, ", ");
1274 }
1275 fprintf(stderr, "\n");
1276 }
1277
1278 /*
1279 * Print a warning about a section mismatch.
1280 * Try to find symbols near it so user can find it.
1281 * Check whitelist before warning - it may be a false positive.
1282 */
1283 static void report_sec_mismatch(const char *modname,
1284 const struct sectioncheck *mismatch,
1285 const char *fromsec,
1286 unsigned long long fromaddr,
1287 const char *fromsym,
1288 int from_is_func,
1289 const char *tosec, const char *tosym,
1290 int to_is_func)
1291 {
1292 const char *from, *from_p;
1293 const char *to, *to_p;
1294 char *prl_from;
1295 char *prl_to;
1296
1297 switch (from_is_func) {
1298 case 0: from = "variable"; from_p = ""; break;
1299 case 1: from = "function"; from_p = "()"; break;
1300 default: from = "(unknown reference)"; from_p = ""; break;
1301 }
1302 switch (to_is_func) {
1303 case 0: to = "variable"; to_p = ""; break;
1304 case 1: to = "function"; to_p = "()"; break;
1305 default: to = "(unknown reference)"; to_p = ""; break;
1306 }
1307
1308 sec_mismatch_count++;
1309 if (!sec_mismatch_verbose)
1310 return;
1311
1312 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1313 "to the %s %s:%s%s\n",
1314 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1315 tosym, to_p);
1316
1317 switch (mismatch->mismatch) {
1318 case TEXT_TO_ANY_INIT:
1319 prl_from = sec2annotation(fromsec);
1320 prl_to = sec2annotation(tosec);
1321 fprintf(stderr,
1322 "The function %s%s() references\n"
1323 "the %s %s%s%s.\n"
1324 "This is often because %s lacks a %s\n"
1325 "annotation or the annotation of %s is wrong.\n",
1326 prl_from, fromsym,
1327 to, prl_to, tosym, to_p,
1328 fromsym, prl_to, tosym);
1329 free(prl_from);
1330 free(prl_to);
1331 break;
1332 case DATA_TO_ANY_INIT: {
1333 prl_to = sec2annotation(tosec);
1334 fprintf(stderr,
1335 "The variable %s references\n"
1336 "the %s %s%s%s\n"
1337 "If the reference is valid then annotate the\n"
1338 "variable with __init* or __refdata (see linux/init.h) "
1339 "or name the variable:\n",
1340 fromsym, to, prl_to, tosym, to_p);
1341 print_section_list(mismatch->symbol_white_list);
1342 free(prl_to);
1343 break;
1344 }
1345 case TEXT_TO_ANY_EXIT:
1346 prl_to = sec2annotation(tosec);
1347 fprintf(stderr,
1348 "The function %s() references a %s in an exit section.\n"
1349 "Often the %s %s%s has valid usage outside the exit section\n"
1350 "and the fix is to remove the %sannotation of %s.\n",
1351 fromsym, to, to, tosym, to_p, prl_to, tosym);
1352 free(prl_to);
1353 break;
1354 case DATA_TO_ANY_EXIT: {
1355 prl_to = sec2annotation(tosec);
1356 fprintf(stderr,
1357 "The variable %s references\n"
1358 "the %s %s%s%s\n"
1359 "If the reference is valid then annotate the\n"
1360 "variable with __exit* (see linux/init.h) or "
1361 "name the variable:\n",
1362 fromsym, to, prl_to, tosym, to_p);
1363 print_section_list(mismatch->symbol_white_list);
1364 free(prl_to);
1365 break;
1366 }
1367 case XXXINIT_TO_SOME_INIT:
1368 case XXXEXIT_TO_SOME_EXIT:
1369 prl_from = sec2annotation(fromsec);
1370 prl_to = sec2annotation(tosec);
1371 fprintf(stderr,
1372 "The %s %s%s%s references\n"
1373 "a %s %s%s%s.\n"
1374 "If %s is only used by %s then\n"
1375 "annotate %s with a matching annotation.\n",
1376 from, prl_from, fromsym, from_p,
1377 to, prl_to, tosym, to_p,
1378 tosym, fromsym, tosym);
1379 free(prl_from);
1380 free(prl_to);
1381 break;
1382 case ANY_INIT_TO_ANY_EXIT:
1383 prl_from = sec2annotation(fromsec);
1384 prl_to = sec2annotation(tosec);
1385 fprintf(stderr,
1386 "The %s %s%s%s references\n"
1387 "a %s %s%s%s.\n"
1388 "This is often seen when error handling "
1389 "in the init function\n"
1390 "uses functionality in the exit path.\n"
1391 "The fix is often to remove the %sannotation of\n"
1392 "%s%s so it may be used outside an exit section.\n",
1393 from, prl_from, fromsym, from_p,
1394 to, prl_to, tosym, to_p,
1395 prl_to, tosym, to_p);
1396 free(prl_from);
1397 free(prl_to);
1398 break;
1399 case ANY_EXIT_TO_ANY_INIT:
1400 prl_from = sec2annotation(fromsec);
1401 prl_to = sec2annotation(tosec);
1402 fprintf(stderr,
1403 "The %s %s%s%s references\n"
1404 "a %s %s%s%s.\n"
1405 "This is often seen when error handling "
1406 "in the exit function\n"
1407 "uses functionality in the init path.\n"
1408 "The fix is often to remove the %sannotation of\n"
1409 "%s%s so it may be used outside an init section.\n",
1410 from, prl_from, fromsym, from_p,
1411 to, prl_to, tosym, to_p,
1412 prl_to, tosym, to_p);
1413 free(prl_from);
1414 free(prl_to);
1415 break;
1416 case EXPORT_TO_INIT_EXIT:
1417 prl_to = sec2annotation(tosec);
1418 fprintf(stderr,
1419 "The symbol %s is exported and annotated %s\n"
1420 "Fix this by removing the %sannotation of %s "
1421 "or drop the export.\n",
1422 tosym, prl_to, prl_to, tosym);
1423 free(prl_to);
1424 break;
1425 }
1426 fprintf(stderr, "\n");
1427 }
1428
1429 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1430 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1431 {
1432 const char *tosec;
1433 const struct sectioncheck *mismatch;
1434
1435 tosec = sec_name(elf, get_secindex(elf, sym));
1436 mismatch = section_mismatch(fromsec, tosec);
1437 if (mismatch) {
1438 Elf_Sym *to;
1439 Elf_Sym *from;
1440 const char *tosym;
1441 const char *fromsym;
1442
1443 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1444 fromsym = sym_name(elf, from);
1445 to = find_elf_symbol(elf, r->r_addend, sym);
1446 tosym = sym_name(elf, to);
1447
1448 /* check whitelist - we may ignore it */
1449 if (secref_whitelist(mismatch,
1450 fromsec, fromsym, tosec, tosym)) {
1451 report_sec_mismatch(modname, mismatch,
1452 fromsec, r->r_offset, fromsym,
1453 is_function(from), tosec, tosym,
1454 is_function(to));
1455 }
1456 }
1457 }
1458
1459 static unsigned int *reloc_location(struct elf_info *elf,
1460 Elf_Shdr *sechdr, Elf_Rela *r)
1461 {
1462 Elf_Shdr *sechdrs = elf->sechdrs;
1463 int section = sechdr->sh_info;
1464
1465 return (void *)elf->hdr + sechdrs[section].sh_offset +
1466 r->r_offset;
1467 }
1468
1469 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1470 {
1471 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1472 unsigned int *location = reloc_location(elf, sechdr, r);
1473
1474 switch (r_typ) {
1475 case R_386_32:
1476 r->r_addend = TO_NATIVE(*location);
1477 break;
1478 case R_386_PC32:
1479 r->r_addend = TO_NATIVE(*location) + 4;
1480 /* For CONFIG_RELOCATABLE=y */
1481 if (elf->hdr->e_type == ET_EXEC)
1482 r->r_addend += r->r_offset;
1483 break;
1484 }
1485 return 0;
1486 }
1487
1488 #ifndef R_ARM_CALL
1489 #define R_ARM_CALL 28
1490 #endif
1491 #ifndef R_ARM_JUMP24
1492 #define R_ARM_JUMP24 29
1493 #endif
1494
1495 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1496 {
1497 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1498
1499 switch (r_typ) {
1500 case R_ARM_ABS32:
1501 /* From ARM ABI: (S + A) | T */
1502 r->r_addend = (int)(long)
1503 (elf->symtab_start + ELF_R_SYM(r->r_info));
1504 break;
1505 case R_ARM_PC24:
1506 case R_ARM_CALL:
1507 case R_ARM_JUMP24:
1508 /* From ARM ABI: ((S + A) | T) - P */
1509 r->r_addend = (int)(long)(elf->hdr +
1510 sechdr->sh_offset +
1511 (r->r_offset - sechdr->sh_addr));
1512 break;
1513 default:
1514 return 1;
1515 }
1516 return 0;
1517 }
1518
1519 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1520 {
1521 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1522 unsigned int *location = reloc_location(elf, sechdr, r);
1523 unsigned int inst;
1524
1525 if (r_typ == R_MIPS_HI16)
1526 return 1; /* skip this */
1527 inst = TO_NATIVE(*location);
1528 switch (r_typ) {
1529 case R_MIPS_LO16:
1530 r->r_addend = inst & 0xffff;
1531 break;
1532 case R_MIPS_26:
1533 r->r_addend = (inst & 0x03ffffff) << 2;
1534 break;
1535 case R_MIPS_32:
1536 r->r_addend = inst;
1537 break;
1538 }
1539 return 0;
1540 }
1541
1542 static void section_rela(const char *modname, struct elf_info *elf,
1543 Elf_Shdr *sechdr)
1544 {
1545 Elf_Sym *sym;
1546 Elf_Rela *rela;
1547 Elf_Rela r;
1548 unsigned int r_sym;
1549 const char *fromsec;
1550
1551 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1552 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1553
1554 fromsec = sech_name(elf, sechdr);
1555 fromsec += strlen(".rela");
1556 /* if from section (name) is know good then skip it */
1557 if (match(fromsec, section_white_list))
1558 return;
1559
1560 for (rela = start; rela < stop; rela++) {
1561 r.r_offset = TO_NATIVE(rela->r_offset);
1562 #if KERNEL_ELFCLASS == ELFCLASS64
1563 if (elf->hdr->e_machine == EM_MIPS) {
1564 unsigned int r_typ;
1565 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1566 r_sym = TO_NATIVE(r_sym);
1567 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1568 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1569 } else {
1570 r.r_info = TO_NATIVE(rela->r_info);
1571 r_sym = ELF_R_SYM(r.r_info);
1572 }
1573 #else
1574 r.r_info = TO_NATIVE(rela->r_info);
1575 r_sym = ELF_R_SYM(r.r_info);
1576 #endif
1577 r.r_addend = TO_NATIVE(rela->r_addend);
1578 sym = elf->symtab_start + r_sym;
1579 /* Skip special sections */
1580 if (is_shndx_special(sym->st_shndx))
1581 continue;
1582 check_section_mismatch(modname, elf, &r, sym, fromsec);
1583 }
1584 }
1585
1586 static void section_rel(const char *modname, struct elf_info *elf,
1587 Elf_Shdr *sechdr)
1588 {
1589 Elf_Sym *sym;
1590 Elf_Rel *rel;
1591 Elf_Rela r;
1592 unsigned int r_sym;
1593 const char *fromsec;
1594
1595 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1596 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1597
1598 fromsec = sech_name(elf, sechdr);
1599 fromsec += strlen(".rel");
1600 /* if from section (name) is know good then skip it */
1601 if (match(fromsec, section_white_list))
1602 return;
1603
1604 for (rel = start; rel < stop; rel++) {
1605 r.r_offset = TO_NATIVE(rel->r_offset);
1606 #if KERNEL_ELFCLASS == ELFCLASS64
1607 if (elf->hdr->e_machine == EM_MIPS) {
1608 unsigned int r_typ;
1609 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1610 r_sym = TO_NATIVE(r_sym);
1611 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1612 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1613 } else {
1614 r.r_info = TO_NATIVE(rel->r_info);
1615 r_sym = ELF_R_SYM(r.r_info);
1616 }
1617 #else
1618 r.r_info = TO_NATIVE(rel->r_info);
1619 r_sym = ELF_R_SYM(r.r_info);
1620 #endif
1621 r.r_addend = 0;
1622 switch (elf->hdr->e_machine) {
1623 case EM_386:
1624 if (addend_386_rel(elf, sechdr, &r))
1625 continue;
1626 break;
1627 case EM_ARM:
1628 if (addend_arm_rel(elf, sechdr, &r))
1629 continue;
1630 break;
1631 case EM_MIPS:
1632 if (addend_mips_rel(elf, sechdr, &r))
1633 continue;
1634 break;
1635 }
1636 sym = elf->symtab_start + r_sym;
1637 /* Skip special sections */
1638 if (is_shndx_special(sym->st_shndx))
1639 continue;
1640 check_section_mismatch(modname, elf, &r, sym, fromsec);
1641 }
1642 }
1643
1644 /**
1645 * A module includes a number of sections that are discarded
1646 * either when loaded or when used as built-in.
1647 * For loaded modules all functions marked __init and all data
1648 * marked __initdata will be discarded when the module has been initialized.
1649 * Likewise for modules used built-in the sections marked __exit
1650 * are discarded because __exit marked function are supposed to be called
1651 * only when a module is unloaded which never happens for built-in modules.
1652 * The check_sec_ref() function traverses all relocation records
1653 * to find all references to a section that reference a section that will
1654 * be discarded and warns about it.
1655 **/
1656 static void check_sec_ref(struct module *mod, const char *modname,
1657 struct elf_info *elf)
1658 {
1659 int i;
1660 Elf_Shdr *sechdrs = elf->sechdrs;
1661
1662 /* Walk through all sections */
1663 for (i = 0; i < elf->num_sections; i++) {
1664 check_section(modname, elf, &elf->sechdrs[i]);
1665 /* We want to process only relocation sections and not .init */
1666 if (sechdrs[i].sh_type == SHT_RELA)
1667 section_rela(modname, elf, &elf->sechdrs[i]);
1668 else if (sechdrs[i].sh_type == SHT_REL)
1669 section_rel(modname, elf, &elf->sechdrs[i]);
1670 }
1671 }
1672
1673 static void read_symbols(char *modname)
1674 {
1675 const char *symname;
1676 char *version;
1677 char *license;
1678 struct module *mod;
1679 struct elf_info info = { };
1680 Elf_Sym *sym;
1681
1682 if (!parse_elf(&info, modname))
1683 return;
1684
1685 mod = new_module(modname);
1686
1687 /* When there's no vmlinux, don't print warnings about
1688 * unresolved symbols (since there'll be too many ;) */
1689 if (is_vmlinux(modname)) {
1690 have_vmlinux = 1;
1691 mod->skip = 1;
1692 }
1693
1694 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1695 if (info.modinfo && !license && !is_vmlinux(modname))
1696 warn("modpost: missing MODULE_LICENSE() in %s\n"
1697 "see include/linux/module.h for "
1698 "more information\n", modname);
1699 while (license) {
1700 if (license_is_gpl_compatible(license))
1701 mod->gpl_compatible = 1;
1702 else {
1703 mod->gpl_compatible = 0;
1704 break;
1705 }
1706 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1707 "license", license);
1708 }
1709
1710 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1711 symname = info.strtab + sym->st_name;
1712
1713 handle_modversions(mod, &info, sym, symname);
1714 handle_moddevtable(mod, &info, sym, symname);
1715 }
1716 if (!is_vmlinux(modname) ||
1717 (is_vmlinux(modname) && vmlinux_section_warnings))
1718 check_sec_ref(mod, modname, &info);
1719
1720 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1721 if (version)
1722 maybe_frob_rcs_version(modname, version, info.modinfo,
1723 version - (char *)info.hdr);
1724 if (version || (all_versions && !is_vmlinux(modname)))
1725 get_src_version(modname, mod->srcversion,
1726 sizeof(mod->srcversion)-1);
1727
1728 parse_elf_finish(&info);
1729
1730 /* Our trick to get versioning for module struct etc. - it's
1731 * never passed as an argument to an exported function, so
1732 * the automatic versioning doesn't pick it up, but it's really
1733 * important anyhow */
1734 if (modversions)
1735 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
1736 }
1737
1738 static void read_symbols_from_files(const char *filename)
1739 {
1740 FILE *in = stdin;
1741 char fname[PATH_MAX];
1742
1743 if (strcmp(filename, "-") != 0) {
1744 in = fopen(filename, "r");
1745 if (!in)
1746 fatal("Can't open filenames file %s: %m", filename);
1747 }
1748
1749 while (fgets(fname, PATH_MAX, in) != NULL) {
1750 if (strends(fname, "\n"))
1751 fname[strlen(fname)-1] = '\0';
1752 read_symbols(fname);
1753 }
1754
1755 if (in != stdin)
1756 fclose(in);
1757 }
1758
1759 #define SZ 500
1760
1761 /* We first write the generated file into memory using the
1762 * following helper, then compare to the file on disk and
1763 * only update the later if anything changed */
1764
1765 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1766 const char *fmt, ...)
1767 {
1768 char tmp[SZ];
1769 int len;
1770 va_list ap;
1771
1772 va_start(ap, fmt);
1773 len = vsnprintf(tmp, SZ, fmt, ap);
1774 buf_write(buf, tmp, len);
1775 va_end(ap);
1776 }
1777
1778 void buf_write(struct buffer *buf, const char *s, int len)
1779 {
1780 if (buf->size - buf->pos < len) {
1781 buf->size += len + SZ;
1782 buf->p = realloc(buf->p, buf->size);
1783 }
1784 strncpy(buf->p + buf->pos, s, len);
1785 buf->pos += len;
1786 }
1787
1788 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1789 {
1790 const char *e = is_vmlinux(m) ?"":".ko";
1791
1792 switch (exp) {
1793 case export_gpl:
1794 fatal("modpost: GPL-incompatible module %s%s "
1795 "uses GPL-only symbol '%s'\n", m, e, s);
1796 break;
1797 case export_unused_gpl:
1798 fatal("modpost: GPL-incompatible module %s%s "
1799 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1800 break;
1801 case export_gpl_future:
1802 warn("modpost: GPL-incompatible module %s%s "
1803 "uses future GPL-only symbol '%s'\n", m, e, s);
1804 break;
1805 case export_plain:
1806 case export_unused:
1807 case export_unknown:
1808 /* ignore */
1809 break;
1810 }
1811 }
1812
1813 static void check_for_unused(enum export exp, const char *m, const char *s)
1814 {
1815 const char *e = is_vmlinux(m) ?"":".ko";
1816
1817 switch (exp) {
1818 case export_unused:
1819 case export_unused_gpl:
1820 warn("modpost: module %s%s "
1821 "uses symbol '%s' marked UNUSED\n", m, e, s);
1822 break;
1823 default:
1824 /* ignore */
1825 break;
1826 }
1827 }
1828
1829 static void check_exports(struct module *mod)
1830 {
1831 struct symbol *s, *exp;
1832
1833 for (s = mod->unres; s; s = s->next) {
1834 const char *basename;
1835 exp = find_symbol(s->name);
1836 if (!exp || exp->module == mod)
1837 continue;
1838 basename = strrchr(mod->name, '/');
1839 if (basename)
1840 basename++;
1841 else
1842 basename = mod->name;
1843 if (!mod->gpl_compatible)
1844 check_for_gpl_usage(exp->export, basename, exp->name);
1845 check_for_unused(exp->export, basename, exp->name);
1846 }
1847 }
1848
1849 /**
1850 * Header for the generated file
1851 **/
1852 static void add_header(struct buffer *b, struct module *mod)
1853 {
1854 buf_printf(b, "#include <linux/module.h>\n");
1855 buf_printf(b, "#include <linux/vermagic.h>\n");
1856 buf_printf(b, "#include <linux/compiler.h>\n");
1857 buf_printf(b, "\n");
1858 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1859 buf_printf(b, "\n");
1860 buf_printf(b, "struct module __this_module\n");
1861 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1862 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
1863 if (mod->has_init)
1864 buf_printf(b, "\t.init = init_module,\n");
1865 if (mod->has_cleanup)
1866 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1867 "\t.exit = cleanup_module,\n"
1868 "#endif\n");
1869 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
1870 buf_printf(b, "};\n");
1871 }
1872
1873 static void add_intree_flag(struct buffer *b, int is_intree)
1874 {
1875 if (is_intree)
1876 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
1877 }
1878
1879 static void add_staging_flag(struct buffer *b, const char *name)
1880 {
1881 static const char *staging_dir = "drivers/staging";
1882
1883 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1884 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1885 }
1886
1887 /**
1888 * Record CRCs for unresolved symbols
1889 **/
1890 static int add_versions(struct buffer *b, struct module *mod)
1891 {
1892 struct symbol *s, *exp;
1893 int err = 0;
1894
1895 for (s = mod->unres; s; s = s->next) {
1896 exp = find_symbol(s->name);
1897 if (!exp || exp->module == mod) {
1898 if (have_vmlinux && !s->weak) {
1899 if (warn_unresolved) {
1900 warn("\"%s\" [%s.ko] undefined!\n",
1901 s->name, mod->name);
1902 } else {
1903 merror("\"%s\" [%s.ko] undefined!\n",
1904 s->name, mod->name);
1905 err = 1;
1906 }
1907 }
1908 continue;
1909 }
1910 s->module = exp->module;
1911 s->crc_valid = exp->crc_valid;
1912 s->crc = exp->crc;
1913 }
1914
1915 if (!modversions)
1916 return err;
1917
1918 buf_printf(b, "\n");
1919 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1920 buf_printf(b, "__used\n");
1921 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1922
1923 for (s = mod->unres; s; s = s->next) {
1924 if (!s->module)
1925 continue;
1926 if (!s->crc_valid) {
1927 warn("\"%s\" [%s.ko] has no CRC!\n",
1928 s->name, mod->name);
1929 continue;
1930 }
1931 buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
1932 s->crc, s->name);
1933 }
1934
1935 buf_printf(b, "};\n");
1936
1937 return err;
1938 }
1939
1940 static void add_depends(struct buffer *b, struct module *mod,
1941 struct module *modules)
1942 {
1943 struct symbol *s;
1944 struct module *m;
1945 int first = 1;
1946
1947 for (m = modules; m; m = m->next)
1948 m->seen = is_vmlinux(m->name);
1949
1950 buf_printf(b, "\n");
1951 buf_printf(b, "static const char __module_depends[]\n");
1952 buf_printf(b, "__used\n");
1953 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1954 buf_printf(b, "\"depends=");
1955 for (s = mod->unres; s; s = s->next) {
1956 const char *p;
1957 if (!s->module)
1958 continue;
1959
1960 if (s->module->seen)
1961 continue;
1962
1963 s->module->seen = 1;
1964 p = strrchr(s->module->name, '/');
1965 if (p)
1966 p++;
1967 else
1968 p = s->module->name;
1969 buf_printf(b, "%s%s", first ? "" : ",", p);
1970 first = 0;
1971 }
1972 buf_printf(b, "\";\n");
1973 }
1974
1975 static void add_srcversion(struct buffer *b, struct module *mod)
1976 {
1977 if (mod->srcversion[0]) {
1978 buf_printf(b, "\n");
1979 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1980 mod->srcversion);
1981 }
1982 }
1983
1984 static void write_if_changed(struct buffer *b, const char *fname)
1985 {
1986 char *tmp;
1987 FILE *file;
1988 struct stat st;
1989
1990 file = fopen(fname, "r");
1991 if (!file)
1992 goto write;
1993
1994 if (fstat(fileno(file), &st) < 0)
1995 goto close_write;
1996
1997 if (st.st_size != b->pos)
1998 goto close_write;
1999
2000 tmp = NOFAIL(malloc(b->pos));
2001 if (fread(tmp, 1, b->pos, file) != b->pos)
2002 goto free_write;
2003
2004 if (memcmp(tmp, b->p, b->pos) != 0)
2005 goto free_write;
2006
2007 free(tmp);
2008 fclose(file);
2009 return;
2010
2011 free_write:
2012 free(tmp);
2013 close_write:
2014 fclose(file);
2015 write:
2016 file = fopen(fname, "w");
2017 if (!file) {
2018 perror(fname);
2019 exit(1);
2020 }
2021 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2022 perror(fname);
2023 exit(1);
2024 }
2025 fclose(file);
2026 }
2027
2028 /* parse Module.symvers file. line format:
2029 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2030 **/
2031 static void read_dump(const char *fname, unsigned int kernel)
2032 {
2033 unsigned long size, pos = 0;
2034 void *file = grab_file(fname, &size);
2035 char *line;
2036
2037 if (!file)
2038 /* No symbol versions, silently ignore */
2039 return;
2040
2041 while ((line = get_next_line(&pos, file, size))) {
2042 char *symname, *modname, *d, *export, *end;
2043 unsigned int crc;
2044 struct module *mod;
2045 struct symbol *s;
2046
2047 if (!(symname = strchr(line, '\t')))
2048 goto fail;
2049 *symname++ = '\0';
2050 if (!(modname = strchr(symname, '\t')))
2051 goto fail;
2052 *modname++ = '\0';
2053 if ((export = strchr(modname, '\t')) != NULL)
2054 *export++ = '\0';
2055 if (export && ((end = strchr(export, '\t')) != NULL))
2056 *end = '\0';
2057 crc = strtoul(line, &d, 16);
2058 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2059 goto fail;
2060 mod = find_module(modname);
2061 if (!mod) {
2062 if (is_vmlinux(modname))
2063 have_vmlinux = 1;
2064 mod = new_module(modname);
2065 mod->skip = 1;
2066 }
2067 s = sym_add_exported(symname, mod, export_no(export));
2068 s->kernel = kernel;
2069 s->preloaded = 1;
2070 sym_update_crc(symname, mod, crc, export_no(export));
2071 }
2072 return;
2073 fail:
2074 fatal("parse error in symbol dump file\n");
2075 }
2076
2077 /* For normal builds always dump all symbols.
2078 * For external modules only dump symbols
2079 * that are not read from kernel Module.symvers.
2080 **/
2081 static int dump_sym(struct symbol *sym)
2082 {
2083 if (!external_module)
2084 return 1;
2085 if (sym->vmlinux || sym->kernel)
2086 return 0;
2087 return 1;
2088 }
2089
2090 static void write_dump(const char *fname)
2091 {
2092 struct buffer buf = { };
2093 struct symbol *symbol;
2094 int n;
2095
2096 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2097 symbol = symbolhash[n];
2098 while (symbol) {
2099 if (dump_sym(symbol))
2100 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
2101 symbol->crc, symbol->name,
2102 symbol->module->name,
2103 export_str(symbol->export));
2104 symbol = symbol->next;
2105 }
2106 }
2107 write_if_changed(&buf, fname);
2108 }
2109
2110 struct ext_sym_list {
2111 struct ext_sym_list *next;
2112 const char *file;
2113 };
2114
2115 int main(int argc, char **argv)
2116 {
2117 struct module *mod;
2118 struct buffer buf = { };
2119 char *kernel_read = NULL, *module_read = NULL;
2120 char *dump_write = NULL, *files_source = NULL;
2121 int opt;
2122 int err;
2123 struct ext_sym_list *extsym_iter;
2124 struct ext_sym_list *extsym_start = NULL;
2125
2126 while ((opt = getopt(argc, argv, "i:I:e:msST:o:awM:K:")) != -1) {
2127 switch (opt) {
2128 case 'i':
2129 kernel_read = optarg;
2130 break;
2131 case 'I':
2132 module_read = optarg;
2133 external_module = 1;
2134 break;
2135 case 'e':
2136 external_module = 1;
2137 extsym_iter =
2138 NOFAIL(malloc(sizeof(*extsym_iter)));
2139 extsym_iter->next = extsym_start;
2140 extsym_iter->file = optarg;
2141 extsym_start = extsym_iter;
2142 break;
2143 case 'm':
2144 modversions = 1;
2145 break;
2146 case 'o':
2147 dump_write = optarg;
2148 break;
2149 case 'a':
2150 all_versions = 1;
2151 break;
2152 case 's':
2153 vmlinux_section_warnings = 0;
2154 break;
2155 case 'S':
2156 sec_mismatch_verbose = 0;
2157 break;
2158 case 'T':
2159 files_source = optarg;
2160 break;
2161 case 'w':
2162 warn_unresolved = 1;
2163 break;
2164 default:
2165 exit(1);
2166 }
2167 }
2168
2169 if (kernel_read)
2170 read_dump(kernel_read, 1);
2171 if (module_read)
2172 read_dump(module_read, 0);
2173 while (extsym_start) {
2174 read_dump(extsym_start->file, 0);
2175 extsym_iter = extsym_start->next;
2176 free(extsym_start);
2177 extsym_start = extsym_iter;
2178 }
2179
2180 while (optind < argc)
2181 read_symbols(argv[optind++]);
2182
2183 if (files_source)
2184 read_symbols_from_files(files_source);
2185
2186 for (mod = modules; mod; mod = mod->next) {
2187 if (mod->skip)
2188 continue;
2189 check_exports(mod);
2190 }
2191
2192 err = 0;
2193
2194 for (mod = modules; mod; mod = mod->next) {
2195 char fname[strlen(mod->name) + 10];
2196
2197 if (mod->skip)
2198 continue;
2199
2200 buf.pos = 0;
2201
2202 add_header(&buf, mod);
2203 add_intree_flag(&buf, !external_module);
2204 add_staging_flag(&buf, mod->name);
2205 err |= add_versions(&buf, mod);
2206 add_depends(&buf, mod, modules);
2207 add_moddevtable(&buf, mod);
2208 add_srcversion(&buf, mod);
2209
2210 sprintf(fname, "%s.mod.c", mod->name);
2211 write_if_changed(&buf, fname);
2212 }
2213
2214 if (dump_write)
2215 write_dump(dump_write);
2216 if (sec_mismatch_count && !sec_mismatch_verbose)
2217 warn("modpost: Found %d section mismatch(es).\n"
2218 "To see full details build your kernel with:\n"
2219 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2220 sec_mismatch_count);
2221
2222 return err;
2223 }
Linux with added FPC-III support