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digi_acceleport: Drag the driver kicking and screaming into coding style
[linux-2.6/verdex.git] / scripts / mod / modpost.c
blobee58ded021d77d815eaa350207befda54186c008
1 /* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006 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 #include <ctype.h>
15 #include "modpost.h"
16 #include "../../include/linux/license.h"
17
18 /* Are we using CONFIG_MODVERSIONS? */
19 int modversions = 0;
20 /* Warn about undefined symbols? (do so if we have vmlinux) */
21 int have_vmlinux = 0;
22 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
23 static int all_versions = 0;
24 /* If we are modposting external module set to 1 */
25 static int external_module = 0;
26 /* Warn about section mismatch in vmlinux if set to 1 */
27 static int vmlinux_section_warnings = 1;
28 /* Only warn about unresolved symbols */
29 static int warn_unresolved = 0;
30 /* How a symbol is exported */
31 enum export {
32 export_plain, export_unused, export_gpl,
33 export_unused_gpl, export_gpl_future, export_unknown
34 };
35
36 void fatal(const char *fmt, ...)
37 {
38 va_list arglist;
39
40 fprintf(stderr, "FATAL: ");
41
42 va_start(arglist, fmt);
43 vfprintf(stderr, fmt, arglist);
44 va_end(arglist);
45
46 exit(1);
47 }
48
49 void warn(const char *fmt, ...)
50 {
51 va_list arglist;
52
53 fprintf(stderr, "WARNING: ");
54
55 va_start(arglist, fmt);
56 vfprintf(stderr, fmt, arglist);
57 va_end(arglist);
58 }
59
60 void merror(const char *fmt, ...)
61 {
62 va_list arglist;
63
64 fprintf(stderr, "ERROR: ");
65
66 va_start(arglist, fmt);
67 vfprintf(stderr, fmt, arglist);
68 va_end(arglist);
69 }
70
71 static int is_vmlinux(const char *modname)
72 {
73 const char *myname;
74
75 if ((myname = strrchr(modname, '/')))
76 myname++;
77 else
78 myname = modname;
79
80 return (strcmp(myname, "vmlinux") == 0) ||
81 (strcmp(myname, "vmlinux.o") == 0);
82 }
83
84 void *do_nofail(void *ptr, const char *expr)
85 {
86 if (!ptr) {
87 fatal("modpost: Memory allocation failure: %s.\n", expr);
88 }
89 return ptr;
90 }
91
92 /* A list of all modules we processed */
93
94 static struct module *modules;
95
96 static struct module *find_module(char *modname)
97 {
98 struct module *mod;
99
100 for (mod = modules; mod; mod = mod->next)
101 if (strcmp(mod->name, modname) == 0)
102 break;
103 return mod;
104 }
105
106 static struct module *new_module(char *modname)
107 {
108 struct module *mod;
109 char *p, *s;
110
111 mod = NOFAIL(malloc(sizeof(*mod)));
112 memset(mod, 0, sizeof(*mod));
113 p = NOFAIL(strdup(modname));
114
115 /* strip trailing .o */
116 if ((s = strrchr(p, '.')) != NULL)
117 if (strcmp(s, ".o") == 0)
118 *s = '\0';
119
120 /* add to list */
121 mod->name = p;
122 mod->gpl_compatible = -1;
123 mod->next = modules;
124 modules = mod;
125
126 return mod;
127 }
128
129 /* A hash of all exported symbols,
130 * struct symbol is also used for lists of unresolved symbols */
131
132 #define SYMBOL_HASH_SIZE 1024
133
134 struct symbol {
135 struct symbol *next;
136 struct module *module;
137 unsigned int crc;
138 int crc_valid;
139 unsigned int weak:1;
140 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
141 unsigned int kernel:1; /* 1 if symbol is from kernel
142 * (only for external modules) **/
143 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
144 enum export export; /* Type of export */
145 char name[0];
146 };
147
148 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
149
150 /* This is based on the hash agorithm from gdbm, via tdb */
151 static inline unsigned int tdb_hash(const char *name)
152 {
153 unsigned value; /* Used to compute the hash value. */
154 unsigned i; /* Used to cycle through random values. */
155
156 /* Set the initial value from the key size. */
157 for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
158 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
159
160 return (1103515243 * value + 12345);
161 }
162
163 /**
164 * Allocate a new symbols for use in the hash of exported symbols or
165 * the list of unresolved symbols per module
166 **/
167 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
168 struct symbol *next)
169 {
170 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
171
172 memset(s, 0, sizeof(*s));
173 strcpy(s->name, name);
174 s->weak = weak;
175 s->next = next;
176 return s;
177 }
178
179 /* For the hash of exported symbols */
180 static struct symbol *new_symbol(const char *name, struct module *module,
181 enum export export)
182 {
183 unsigned int hash;
184 struct symbol *new;
185
186 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
187 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
188 new->module = module;
189 new->export = export;
190 return new;
191 }
192
193 static struct symbol *find_symbol(const char *name)
194 {
195 struct symbol *s;
196
197 /* For our purposes, .foo matches foo. PPC64 needs this. */
198 if (name[0] == '.')
199 name++;
200
201 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) {
202 if (strcmp(s->name, name) == 0)
203 return s;
204 }
205 return NULL;
206 }
207
208 static struct {
209 const char *str;
210 enum export export;
211 } export_list[] = {
212 { .str = "EXPORT_SYMBOL", .export = export_plain },
213 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
214 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
215 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
216 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
217 { .str = "(unknown)", .export = export_unknown },
218 };
219
220
221 static const char *export_str(enum export ex)
222 {
223 return export_list[ex].str;
224 }
225
226 static enum export export_no(const char * s)
227 {
228 int i;
229 if (!s)
230 return export_unknown;
231 for (i = 0; export_list[i].export != export_unknown; i++) {
232 if (strcmp(export_list[i].str, s) == 0)
233 return export_list[i].export;
234 }
235 return export_unknown;
236 }
237
238 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
239 {
240 if (sec == elf->export_sec)
241 return export_plain;
242 else if (sec == elf->export_unused_sec)
243 return export_unused;
244 else if (sec == elf->export_gpl_sec)
245 return export_gpl;
246 else if (sec == elf->export_unused_gpl_sec)
247 return export_unused_gpl;
248 else if (sec == elf->export_gpl_future_sec)
249 return export_gpl_future;
250 else
251 return export_unknown;
252 }
253
254 /**
255 * Add an exported symbol - it may have already been added without a
256 * CRC, in this case just update the CRC
257 **/
258 static struct symbol *sym_add_exported(const char *name, struct module *mod,
259 enum export export)
260 {
261 struct symbol *s = find_symbol(name);
262
263 if (!s) {
264 s = new_symbol(name, mod, export);
265 } else {
266 if (!s->preloaded) {
267 warn("%s: '%s' exported twice. Previous export "
268 "was in %s%s\n", mod->name, name,
269 s->module->name,
270 is_vmlinux(s->module->name) ?"":".ko");
271 }
272 }
273 s->preloaded = 0;
274 s->vmlinux = is_vmlinux(mod->name);
275 s->kernel = 0;
276 s->export = export;
277 return s;
278 }
279
280 static void sym_update_crc(const char *name, struct module *mod,
281 unsigned int crc, enum export export)
282 {
283 struct symbol *s = find_symbol(name);
284
285 if (!s)
286 s = new_symbol(name, mod, export);
287 s->crc = crc;
288 s->crc_valid = 1;
289 }
290
291 void *grab_file(const char *filename, unsigned long *size)
292 {
293 struct stat st;
294 void *map;
295 int fd;
296
297 fd = open(filename, O_RDONLY);
298 if (fd < 0 || fstat(fd, &st) != 0)
299 return NULL;
300
301 *size = st.st_size;
302 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
303 close(fd);
304
305 if (map == MAP_FAILED)
306 return NULL;
307 return map;
308 }
309
310 /**
311 * Return a copy of the next line in a mmap'ed file.
312 * spaces in the beginning of the line is trimmed away.
313 * Return a pointer to a static buffer.
314 **/
315 char* get_next_line(unsigned long *pos, void *file, unsigned long size)
316 {
317 static char line[4096];
318 int skip = 1;
319 size_t len = 0;
320 signed char *p = (signed char *)file + *pos;
321 char *s = line;
322
323 for (; *pos < size ; (*pos)++)
324 {
325 if (skip && isspace(*p)) {
326 p++;
327 continue;
328 }
329 skip = 0;
330 if (*p != '\n' && (*pos < size)) {
331 len++;
332 *s++ = *p++;
333 if (len > 4095)
334 break; /* Too long, stop */
335 } else {
336 /* End of string */
337 *s = '\0';
338 return line;
339 }
340 }
341 /* End of buffer */
342 return NULL;
343 }
344
345 void release_file(void *file, unsigned long size)
346 {
347 munmap(file, size);
348 }
349
350 static int parse_elf(struct elf_info *info, const char *filename)
351 {
352 unsigned int i;
353 Elf_Ehdr *hdr;
354 Elf_Shdr *sechdrs;
355 Elf_Sym *sym;
356
357 hdr = grab_file(filename, &info->size);
358 if (!hdr) {
359 perror(filename);
360 exit(1);
361 }
362 info->hdr = hdr;
363 if (info->size < sizeof(*hdr)) {
364 /* file too small, assume this is an empty .o file */
365 return 0;
366 }
367 /* Is this a valid ELF file? */
368 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
369 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
370 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
371 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
372 /* Not an ELF file - silently ignore it */
373 return 0;
374 }
375 /* Fix endianness in ELF header */
376 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
377 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
378 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
379 hdr->e_machine = TO_NATIVE(hdr->e_machine);
380 hdr->e_type = TO_NATIVE(hdr->e_type);
381 sechdrs = (void *)hdr + hdr->e_shoff;
382 info->sechdrs = sechdrs;
383
384 /* Fix endianness in section headers */
385 for (i = 0; i < hdr->e_shnum; i++) {
386 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
387 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
388 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
389 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
390 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
391 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
392 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
393 }
394 /* Find symbol table. */
395 for (i = 1; i < hdr->e_shnum; i++) {
396 const char *secstrings
397 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
398 const char *secname;
399
400 if (sechdrs[i].sh_offset > info->size) {
401 fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
402 return 0;
403 }
404 secname = secstrings + sechdrs[i].sh_name;
405 if (strcmp(secname, ".modinfo") == 0) {
406 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
407 info->modinfo_len = sechdrs[i].sh_size;
408 } else if (strcmp(secname, "__ksymtab") == 0)
409 info->export_sec = i;
410 else if (strcmp(secname, "__ksymtab_unused") == 0)
411 info->export_unused_sec = i;
412 else if (strcmp(secname, "__ksymtab_gpl") == 0)
413 info->export_gpl_sec = i;
414 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
415 info->export_unused_gpl_sec = i;
416 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
417 info->export_gpl_future_sec = i;
418
419 if (sechdrs[i].sh_type != SHT_SYMTAB)
420 continue;
421
422 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
423 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
424 + sechdrs[i].sh_size;
425 info->strtab = (void *)hdr +
426 sechdrs[sechdrs[i].sh_link].sh_offset;
427 }
428 if (!info->symtab_start) {
429 fatal("%s has no symtab?\n", filename);
430 }
431 /* Fix endianness in symbols */
432 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
433 sym->st_shndx = TO_NATIVE(sym->st_shndx);
434 sym->st_name = TO_NATIVE(sym->st_name);
435 sym->st_value = TO_NATIVE(sym->st_value);
436 sym->st_size = TO_NATIVE(sym->st_size);
437 }
438 return 1;
439 }
440
441 static void parse_elf_finish(struct elf_info *info)
442 {
443 release_file(info->hdr, info->size);
444 }
445
446 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
447 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
448
449 static void handle_modversions(struct module *mod, struct elf_info *info,
450 Elf_Sym *sym, const char *symname)
451 {
452 unsigned int crc;
453 enum export export = export_from_sec(info, sym->st_shndx);
454
455 switch (sym->st_shndx) {
456 case SHN_COMMON:
457 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
458 break;
459 case SHN_ABS:
460 /* CRC'd symbol */
461 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
462 crc = (unsigned int) sym->st_value;
463 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
464 export);
465 }
466 break;
467 case SHN_UNDEF:
468 /* undefined symbol */
469 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
470 ELF_ST_BIND(sym->st_info) != STB_WEAK)
471 break;
472 /* ignore global offset table */
473 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
474 break;
475 /* ignore __this_module, it will be resolved shortly */
476 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
477 break;
478 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
479 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
480 /* add compatibility with older glibc */
481 #ifndef STT_SPARC_REGISTER
482 #define STT_SPARC_REGISTER STT_REGISTER
483 #endif
484 if (info->hdr->e_machine == EM_SPARC ||
485 info->hdr->e_machine == EM_SPARCV9) {
486 /* Ignore register directives. */
487 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
488 break;
489 if (symname[0] == '.') {
490 char *munged = strdup(symname);
491 munged[0] = '_';
492 munged[1] = toupper(munged[1]);
493 symname = munged;
494 }
495 }
496 #endif
497
498 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
499 strlen(MODULE_SYMBOL_PREFIX)) == 0)
500 mod->unres = alloc_symbol(symname +
501 strlen(MODULE_SYMBOL_PREFIX),
502 ELF_ST_BIND(sym->st_info) == STB_WEAK,
503 mod->unres);
504 break;
505 default:
506 /* All exported symbols */
507 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
508 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
509 export);
510 }
511 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
512 mod->has_init = 1;
513 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
514 mod->has_cleanup = 1;
515 break;
516 }
517 }
518
519 /**
520 * Parse tag=value strings from .modinfo section
521 **/
522 static char *next_string(char *string, unsigned long *secsize)
523 {
524 /* Skip non-zero chars */
525 while (string[0]) {
526 string++;
527 if ((*secsize)-- <= 1)
528 return NULL;
529 }
530
531 /* Skip any zero padding. */
532 while (!string[0]) {
533 string++;
534 if ((*secsize)-- <= 1)
535 return NULL;
536 }
537 return string;
538 }
539
540 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
541 const char *tag, char *info)
542 {
543 char *p;
544 unsigned int taglen = strlen(tag);
545 unsigned long size = modinfo_len;
546
547 if (info) {
548 size -= info - (char *)modinfo;
549 modinfo = next_string(info, &size);
550 }
551
552 for (p = modinfo; p; p = next_string(p, &size)) {
553 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
554 return p + taglen + 1;
555 }
556 return NULL;
557 }
558
559 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
560 const char *tag)
561
562 {
563 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
564 }
565
566 /**
567 * Test if string s ends in string sub
568 * return 0 if match
569 **/
570 static int strrcmp(const char *s, const char *sub)
571 {
572 int slen, sublen;
573
574 if (!s || !sub)
575 return 1;
576
577 slen = strlen(s);
578 sublen = strlen(sub);
579
580 if ((slen == 0) || (sublen == 0))
581 return 1;
582
583 if (sublen > slen)
584 return 1;
585
586 return memcmp(s + slen - sublen, sub, sublen);
587 }
588
589 /*
590 * Functions used only during module init is marked __init and is stored in
591 * a .init.text section. Likewise data is marked __initdata and stored in
592 * a .init.data section.
593 * If this section is one of these sections return 1
594 * See include/linux/init.h for the details
595 */
596 static int init_section(const char *name)
597 {
598 if (strcmp(name, ".init") == 0)
599 return 1;
600 if (strncmp(name, ".init.", strlen(".init.")) == 0)
601 return 1;
602 return 0;
603 }
604
605 /*
606 * Functions used only during module exit is marked __exit and is stored in
607 * a .exit.text section. Likewise data is marked __exitdata and stored in
608 * a .exit.data section.
609 * If this section is one of these sections return 1
610 * See include/linux/init.h for the details
611 **/
612 static int exit_section(const char *name)
613 {
614 if (strcmp(name, ".exit.text") == 0)
615 return 1;
616 if (strcmp(name, ".exit.data") == 0)
617 return 1;
618 return 0;
619
620 }
621
622 /*
623 * Data sections are named like this:
624 * .data | .data.rel | .data.rel.*
625 * Return 1 if the specified section is a data section
626 */
627 static int data_section(const char *name)
628 {
629 if ((strcmp(name, ".data") == 0) ||
630 (strcmp(name, ".data.rel") == 0) ||
631 (strncmp(name, ".data.rel.", strlen(".data.rel.")) == 0))
632 return 1;
633 else
634 return 0;
635 }
636
637 /**
638 * Whitelist to allow certain references to pass with no warning.
639 *
640 * Pattern 0:
641 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
642 * The pattern is identified by:
643 * fromsec = .text.init.refok* | .data.init.refok*
644 *
645 * Pattern 1:
646 * If a module parameter is declared __initdata and permissions=0
647 * then this is legal despite the warning generated.
648 * We cannot see value of permissions here, so just ignore
649 * this pattern.
650 * The pattern is identified by:
651 * tosec = .init.data
652 * fromsec = .data*
653 * atsym =__param*
654 *
655 * Pattern 2:
656 * Many drivers utilise a *driver container with references to
657 * add, remove, probe functions etc.
658 * These functions may often be marked __init and we do not want to
659 * warn here.
660 * the pattern is identified by:
661 * tosec = init or exit section
662 * fromsec = data section
663 * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console, *_timer
664 *
665 * Pattern 3:
666 * Whitelist all refereces from .text.head to .init.data
667 * Whitelist all refereces from .text.head to .init.text
668 *
669 * Pattern 4:
670 * Some symbols belong to init section but still it is ok to reference
671 * these from non-init sections as these symbols don't have any memory
672 * allocated for them and symbol address and value are same. So even
673 * if init section is freed, its ok to reference those symbols.
674 * For ex. symbols marking the init section boundaries.
675 * This pattern is identified by
676 * refsymname = __init_begin, _sinittext, _einittext
677 *
678 * Pattern 5:
679 * Xtensa uses literal sections for constants that are accessed PC-relative.
680 * Literal sections may safely reference their text sections.
681 * (Note that the name for the literal section omits any trailing '.text')
682 * tosec = <section>[.text]
683 * fromsec = <section>.literal
684 **/
685 static int secref_whitelist(const char *modname, const char *tosec,
686 const char *fromsec, const char *atsym,
687 const char *refsymname)
688 {
689 int len;
690 const char **s;
691 const char *pat2sym[] = {
692 "driver",
693 "_template", /* scsi uses *_template a lot */
694 "_timer", /* arm uses ops structures named _timer a lot */
695 "_sht", /* scsi also used *_sht to some extent */
696 "_ops",
697 "_probe",
698 "_probe_one",
699 "_console",
700 NULL
701 };
702
703 const char *pat3refsym[] = {
704 "__init_begin",
705 "_sinittext",
706 "_einittext",
707 NULL
708 };
709
710 /* Check for pattern 0 */
711 if ((strncmp(fromsec, ".text.init.refok", strlen(".text.init.refok")) == 0) ||
712 (strncmp(fromsec, ".data.init.refok", strlen(".data.init.refok")) == 0))
713 return 1;
714
715 /* Check for pattern 1 */
716 if ((strcmp(tosec, ".init.data") == 0) &&
717 (strncmp(fromsec, ".data", strlen(".data")) == 0) &&
718 (strncmp(atsym, "__param", strlen("__param")) == 0))
719 return 1;
720
721 /* Check for pattern 2 */
722 if ((init_section(tosec) || exit_section(tosec)) && data_section(fromsec))
723 for (s = pat2sym; *s; s++)
724 if (strrcmp(atsym, *s) == 0)
725 return 1;
726
727 /* Check for pattern 3 */
728 if ((strcmp(fromsec, ".text.head") == 0) &&
729 ((strcmp(tosec, ".init.data") == 0) ||
730 (strcmp(tosec, ".init.text") == 0)))
731 return 1;
732
733 /* Check for pattern 4 */
734 for (s = pat3refsym; *s; s++)
735 if (strcmp(refsymname, *s) == 0)
736 return 1;
737
738 /* Check for pattern 5 */
739 if (strrcmp(tosec, ".text") == 0)
740 len = strlen(tosec) - strlen(".text");
741 else
742 len = strlen(tosec);
743 if ((strncmp(tosec, fromsec, len) == 0) && (strlen(fromsec) > len) &&
744 (strcmp(fromsec + len, ".literal") == 0))
745 return 1;
746
747 return 0;
748 }
749
750 /**
751 * Find symbol based on relocation record info.
752 * In some cases the symbol supplied is a valid symbol so
753 * return refsym. If st_name != 0 we assume this is a valid symbol.
754 * In other cases the symbol needs to be looked up in the symbol table
755 * based on section and address.
756 * **/
757 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
758 Elf_Sym *relsym)
759 {
760 Elf_Sym *sym;
761
762 if (relsym->st_name != 0)
763 return relsym;
764 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
765 if (sym->st_shndx != relsym->st_shndx)
766 continue;
767 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
768 continue;
769 if (sym->st_value == addr)
770 return sym;
771 }
772 return NULL;
773 }
774
775 static inline int is_arm_mapping_symbol(const char *str)
776 {
777 return str[0] == '$' && strchr("atd", str[1])
778 && (str[2] == '\0' || str[2] == '.');
779 }
780
781 /*
782 * If there's no name there, ignore it; likewise, ignore it if it's
783 * one of the magic symbols emitted used by current ARM tools.
784 *
785 * Otherwise if find_symbols_between() returns those symbols, they'll
786 * fail the whitelist tests and cause lots of false alarms ... fixable
787 * only by merging __exit and __init sections into __text, bloating
788 * the kernel (which is especially evil on embedded platforms).
789 */
790 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
791 {
792 const char *name = elf->strtab + sym->st_name;
793
794 if (!name || !strlen(name))
795 return 0;
796 return !is_arm_mapping_symbol(name);
797 }
798
799 /*
800 * Find symbols before or equal addr and after addr - in the section sec.
801 * If we find two symbols with equal offset prefer one with a valid name.
802 * The ELF format may have a better way to detect what type of symbol
803 * it is, but this works for now.
804 **/
805 static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
806 const char *sec,
807 Elf_Sym **before, Elf_Sym **after)
808 {
809 Elf_Sym *sym;
810 Elf_Ehdr *hdr = elf->hdr;
811 Elf_Addr beforediff = ~0;
812 Elf_Addr afterdiff = ~0;
813 const char *secstrings = (void *)hdr +
814 elf->sechdrs[hdr->e_shstrndx].sh_offset;
815
816 *before = NULL;
817 *after = NULL;
818
819 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
820 const char *symsec;
821
822 if (sym->st_shndx >= SHN_LORESERVE)
823 continue;
824 symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
825 if (strcmp(symsec, sec) != 0)
826 continue;
827 if (!is_valid_name(elf, sym))
828 continue;
829 if (sym->st_value <= addr) {
830 if ((addr - sym->st_value) < beforediff) {
831 beforediff = addr - sym->st_value;
832 *before = sym;
833 }
834 else if ((addr - sym->st_value) == beforediff) {
835 *before = sym;
836 }
837 }
838 else
839 {
840 if ((sym->st_value - addr) < afterdiff) {
841 afterdiff = sym->st_value - addr;
842 *after = sym;
843 }
844 else if ((sym->st_value - addr) == afterdiff) {
845 *after = sym;
846 }
847 }
848 }
849 }
850
851 /**
852 * Print a warning about a section mismatch.
853 * Try to find symbols near it so user can find it.
854 * Check whitelist before warning - it may be a false positive.
855 **/
856 static void warn_sec_mismatch(const char *modname, const char *fromsec,
857 struct elf_info *elf, Elf_Sym *sym, Elf_Rela r)
858 {
859 const char *refsymname = "";
860 Elf_Sym *before, *after;
861 Elf_Sym *refsym;
862 Elf_Ehdr *hdr = elf->hdr;
863 Elf_Shdr *sechdrs = elf->sechdrs;
864 const char *secstrings = (void *)hdr +
865 sechdrs[hdr->e_shstrndx].sh_offset;
866 const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name;
867
868 find_symbols_between(elf, r.r_offset, fromsec, &before, &after);
869
870 refsym = find_elf_symbol(elf, r.r_addend, sym);
871 if (refsym && strlen(elf->strtab + refsym->st_name))
872 refsymname = elf->strtab + refsym->st_name;
873
874 /* check whitelist - we may ignore it */
875 if (secref_whitelist(modname, secname, fromsec,
876 before ? elf->strtab + before->st_name : "",
877 refsymname))
878 return;
879
880 if (before && after) {
881 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
882 "(between '%s' and '%s')\n",
883 modname, fromsec, (unsigned long long)r.r_offset,
884 secname, refsymname,
885 elf->strtab + before->st_name,
886 elf->strtab + after->st_name);
887 } else if (before) {
888 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
889 "(after '%s')\n",
890 modname, fromsec, (unsigned long long)r.r_offset,
891 secname, refsymname,
892 elf->strtab + before->st_name);
893 } else if (after) {
894 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
895 "before '%s' (at offset -0x%llx)\n",
896 modname, fromsec, (unsigned long long)r.r_offset,
897 secname, refsymname,
898 elf->strtab + after->st_name);
899 } else {
900 warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
901 modname, fromsec, (unsigned long long)r.r_offset,
902 secname, refsymname);
903 }
904 }
905
906 static unsigned int *reloc_location(struct elf_info *elf,
907 int rsection, Elf_Rela *r)
908 {
909 Elf_Shdr *sechdrs = elf->sechdrs;
910 int section = sechdrs[rsection].sh_info;
911
912 return (void *)elf->hdr + sechdrs[section].sh_offset +
913 (r->r_offset - sechdrs[section].sh_addr);
914 }
915
916 static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
917 {
918 unsigned int r_typ = ELF_R_TYPE(r->r_info);
919 unsigned int *location = reloc_location(elf, rsection, r);
920
921 switch (r_typ) {
922 case R_386_32:
923 r->r_addend = TO_NATIVE(*location);
924 break;
925 case R_386_PC32:
926 r->r_addend = TO_NATIVE(*location) + 4;
927 /* For CONFIG_RELOCATABLE=y */
928 if (elf->hdr->e_type == ET_EXEC)
929 r->r_addend += r->r_offset;
930 break;
931 }
932 return 0;
933 }
934
935 static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
936 {
937 unsigned int r_typ = ELF_R_TYPE(r->r_info);
938
939 switch (r_typ) {
940 case R_ARM_ABS32:
941 /* From ARM ABI: (S + A) | T */
942 r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
943 break;
944 case R_ARM_PC24:
945 /* From ARM ABI: ((S + A) | T) - P */
946 r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
947 (r->r_offset - elf->sechdrs[rsection].sh_addr));
948 break;
949 default:
950 return 1;
951 }
952 return 0;
953 }
954
955 static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
956 {
957 unsigned int r_typ = ELF_R_TYPE(r->r_info);
958 unsigned int *location = reloc_location(elf, rsection, r);
959 unsigned int inst;
960
961 if (r_typ == R_MIPS_HI16)
962 return 1; /* skip this */
963 inst = TO_NATIVE(*location);
964 switch (r_typ) {
965 case R_MIPS_LO16:
966 r->r_addend = inst & 0xffff;
967 break;
968 case R_MIPS_26:
969 r->r_addend = (inst & 0x03ffffff) << 2;
970 break;
971 case R_MIPS_32:
972 r->r_addend = inst;
973 break;
974 }
975 return 0;
976 }
977
978 /**
979 * A module includes a number of sections that are discarded
980 * either when loaded or when used as built-in.
981 * For loaded modules all functions marked __init and all data
982 * marked __initdata will be discarded when the module has been intialized.
983 * Likewise for modules used built-in the sections marked __exit
984 * are discarded because __exit marked function are supposed to be called
985 * only when a moduel is unloaded which never happes for built-in modules.
986 * The check_sec_ref() function traverses all relocation records
987 * to find all references to a section that reference a section that will
988 * be discarded and warns about it.
989 **/
990 static void check_sec_ref(struct module *mod, const char *modname,
991 struct elf_info *elf,
992 int section(const char*),
993 int section_ref_ok(const char *))
994 {
995 int i;
996 Elf_Sym *sym;
997 Elf_Ehdr *hdr = elf->hdr;
998 Elf_Shdr *sechdrs = elf->sechdrs;
999 const char *secstrings = (void *)hdr +
1000 sechdrs[hdr->e_shstrndx].sh_offset;
1001
1002 /* Walk through all sections */
1003 for (i = 0; i < hdr->e_shnum; i++) {
1004 const char *name = secstrings + sechdrs[i].sh_name;
1005 const char *secname;
1006 Elf_Rela r;
1007 unsigned int r_sym;
1008 /* We want to process only relocation sections and not .init */
1009 if (sechdrs[i].sh_type == SHT_RELA) {
1010 Elf_Rela *rela;
1011 Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
1012 Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
1013 name += strlen(".rela");
1014 if (section_ref_ok(name))
1015 continue;
1016
1017 for (rela = start; rela < stop; rela++) {
1018 r.r_offset = TO_NATIVE(rela->r_offset);
1019 #if KERNEL_ELFCLASS == ELFCLASS64
1020 if (hdr->e_machine == EM_MIPS) {
1021 unsigned int r_typ;
1022 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1023 r_sym = TO_NATIVE(r_sym);
1024 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1025 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1026 } else {
1027 r.r_info = TO_NATIVE(rela->r_info);
1028 r_sym = ELF_R_SYM(r.r_info);
1029 }
1030 #else
1031 r.r_info = TO_NATIVE(rela->r_info);
1032 r_sym = ELF_R_SYM(r.r_info);
1033 #endif
1034 r.r_addend = TO_NATIVE(rela->r_addend);
1035 sym = elf->symtab_start + r_sym;
1036 /* Skip special sections */
1037 if (sym->st_shndx >= SHN_LORESERVE)
1038 continue;
1039
1040 secname = secstrings +
1041 sechdrs[sym->st_shndx].sh_name;
1042 if (section(secname))
1043 warn_sec_mismatch(modname, name,
1044 elf, sym, r);
1045 }
1046 } else if (sechdrs[i].sh_type == SHT_REL) {
1047 Elf_Rel *rel;
1048 Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
1049 Elf_Rel *stop = (void*)start + sechdrs[i].sh_size;
1050 name += strlen(".rel");
1051 if (section_ref_ok(name))
1052 continue;
1053
1054 for (rel = start; rel < stop; rel++) {
1055 r.r_offset = TO_NATIVE(rel->r_offset);
1056 #if KERNEL_ELFCLASS == ELFCLASS64
1057 if (hdr->e_machine == EM_MIPS) {
1058 unsigned int r_typ;
1059 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1060 r_sym = TO_NATIVE(r_sym);
1061 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1062 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1063 } else {
1064 r.r_info = TO_NATIVE(rel->r_info);
1065 r_sym = ELF_R_SYM(r.r_info);
1066 }
1067 #else
1068 r.r_info = TO_NATIVE(rel->r_info);
1069 r_sym = ELF_R_SYM(r.r_info);
1070 #endif
1071 r.r_addend = 0;
1072 switch (hdr->e_machine) {
1073 case EM_386:
1074 if (addend_386_rel(elf, i, &r))
1075 continue;
1076 break;
1077 case EM_ARM:
1078 if(addend_arm_rel(elf, i, &r))
1079 continue;
1080 break;
1081 case EM_MIPS:
1082 if (addend_mips_rel(elf, i, &r))
1083 continue;
1084 break;
1085 }
1086 sym = elf->symtab_start + r_sym;
1087 /* Skip special sections */
1088 if (sym->st_shndx >= SHN_LORESERVE)
1089 continue;
1090
1091 secname = secstrings +
1092 sechdrs[sym->st_shndx].sh_name;
1093 if (section(secname))
1094 warn_sec_mismatch(modname, name,
1095 elf, sym, r);
1096 }
1097 }
1098 }
1099 }
1100
1101 /*
1102 * Identify sections from which references to either a
1103 * .init or a .exit section is OK.
1104 *
1105 * [OPD] Keith Ownes <kaos@sgi.com> commented:
1106 * For our future {in}sanity, add a comment that this is the ppc .opd
1107 * section, not the ia64 .opd section.
1108 * ia64 .opd should not point to discarded sections.
1109 * [.rodata] like for .init.text we ignore .rodata references -same reason
1110 */
1111 static int initexit_section_ref_ok(const char *name)
1112 {
1113 const char **s;
1114 /* Absolute section names */
1115 const char *namelist1[] = {
1116 "__bug_table", /* used by powerpc for BUG() */
1117 "__ex_table",
1118 ".altinstructions",
1119 ".cranges", /* used by sh64 */
1120 ".fixup",
1121 ".machvec", /* ia64 + powerpc uses these */
1122 ".machine.desc",
1123 ".opd", /* See comment [OPD] */
1124 ".parainstructions",
1125 ".pdr",
1126 ".plt", /* seen on ARCH=um build on x86_64. Harmless */
1127 ".smp_locks",
1128 ".stab",
1129 ".m68k_fixup",
1130 ".xt.prop", /* xtensa informational section */
1131 ".xt.lit", /* xtensa informational section */
1132 NULL
1133 };
1134 /* Start of section names */
1135 const char *namelist2[] = {
1136 ".debug",
1137 ".eh_frame",
1138 ".note", /* ignore ELF notes - may contain anything */
1139 ".got", /* powerpc - global offset table */
1140 ".toc", /* powerpc - table of contents */
1141 NULL
1142 };
1143 /* part of section name */
1144 const char *namelist3 [] = {
1145 ".unwind", /* Sample: IA_64.unwind.exit.text */
1146 NULL
1147 };
1148
1149 for (s = namelist1; *s; s++)
1150 if (strcmp(*s, name) == 0)
1151 return 1;
1152 for (s = namelist2; *s; s++)
1153 if (strncmp(*s, name, strlen(*s)) == 0)
1154 return 1;
1155 for (s = namelist3; *s; s++)
1156 if (strstr(name, *s) != NULL)
1157 return 1;
1158 return 0;
1159 }
1160
1161
1162 /*
1163 * Identify sections from which references to a .init section is OK.
1164 *
1165 * Unfortunately references to read only data that referenced .init
1166 * sections had to be excluded. Almost all of these are false
1167 * positives, they are created by gcc. The downside of excluding rodata
1168 * is that there really are some user references from rodata to
1169 * init code, e.g. drivers/video/vgacon.c:
1170 *
1171 * const struct consw vga_con = {
1172 * con_startup: vgacon_startup,
1173 *
1174 * where vgacon_startup is __init. If you want to wade through the false
1175 * positives, take out the check for rodata.
1176 */
1177 static int init_section_ref_ok(const char *name)
1178 {
1179 const char **s;
1180 /* Absolute section names */
1181 const char *namelist1[] = {
1182 "__dbe_table", /* MIPS generate these */
1183 "__ftr_fixup", /* powerpc cpu feature fixup */
1184 "__fw_ftr_fixup", /* powerpc firmware feature fixup */
1185 "__param",
1186 ".data.rel.ro", /* used by parisc64 */
1187 ".init",
1188 ".text.lock",
1189 NULL
1190 };
1191 /* Start of section names */
1192 const char *namelist2[] = {
1193 ".init.",
1194 ".pci_fixup",
1195 ".rodata",
1196 NULL
1197 };
1198
1199 if (initexit_section_ref_ok(name))
1200 return 1;
1201
1202 for (s = namelist1; *s; s++)
1203 if (strcmp(*s, name) == 0)
1204 return 1;
1205 for (s = namelist2; *s; s++)
1206 if (strncmp(*s, name, strlen(*s)) == 0)
1207 return 1;
1208
1209 /* If section name ends with ".init" we allow references
1210 * as is the case with .initcallN.init, .early_param.init, .taglist.init etc
1211 */
1212 if (strrcmp(name, ".init") == 0)
1213 return 1;
1214 return 0;
1215 }
1216
1217 /*
1218 * Identify sections from which references to a .exit section is OK.
1219 */
1220 static int exit_section_ref_ok(const char *name)
1221 {
1222 const char **s;
1223 /* Absolute section names */
1224 const char *namelist1[] = {
1225 ".exit.data",
1226 ".exit.text",
1227 ".exitcall.exit",
1228 ".rodata",
1229 NULL
1230 };
1231
1232 if (initexit_section_ref_ok(name))
1233 return 1;
1234
1235 for (s = namelist1; *s; s++)
1236 if (strcmp(*s, name) == 0)
1237 return 1;
1238 return 0;
1239 }
1240
1241 static void read_symbols(char *modname)
1242 {
1243 const char *symname;
1244 char *version;
1245 char *license;
1246 struct module *mod;
1247 struct elf_info info = { };
1248 Elf_Sym *sym;
1249
1250 if (!parse_elf(&info, modname))
1251 return;
1252
1253 mod = new_module(modname);
1254
1255 /* When there's no vmlinux, don't print warnings about
1256 * unresolved symbols (since there'll be too many ;) */
1257 if (is_vmlinux(modname)) {
1258 have_vmlinux = 1;
1259 mod->skip = 1;
1260 }
1261
1262 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1263 while (license) {
1264 if (license_is_gpl_compatible(license))
1265 mod->gpl_compatible = 1;
1266 else {
1267 mod->gpl_compatible = 0;
1268 break;
1269 }
1270 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1271 "license", license);
1272 }
1273
1274 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1275 symname = info.strtab + sym->st_name;
1276
1277 handle_modversions(mod, &info, sym, symname);
1278 handle_moddevtable(mod, &info, sym, symname);
1279 }
1280 if (is_vmlinux(modname) && vmlinux_section_warnings) {
1281 check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
1282 check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
1283 }
1284
1285 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1286 if (version)
1287 maybe_frob_rcs_version(modname, version, info.modinfo,
1288 version - (char *)info.hdr);
1289 if (version || (all_versions && !is_vmlinux(modname)))
1290 get_src_version(modname, mod->srcversion,
1291 sizeof(mod->srcversion)-1);
1292
1293 parse_elf_finish(&info);
1294
1295 /* Our trick to get versioning for struct_module - it's
1296 * never passed as an argument to an exported function, so
1297 * the automatic versioning doesn't pick it up, but it's really
1298 * important anyhow */
1299 if (modversions)
1300 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1301 }
1302
1303 #define SZ 500
1304
1305 /* We first write the generated file into memory using the
1306 * following helper, then compare to the file on disk and
1307 * only update the later if anything changed */
1308
1309 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1310 const char *fmt, ...)
1311 {
1312 char tmp[SZ];
1313 int len;
1314 va_list ap;
1315
1316 va_start(ap, fmt);
1317 len = vsnprintf(tmp, SZ, fmt, ap);
1318 buf_write(buf, tmp, len);
1319 va_end(ap);
1320 }
1321
1322 void buf_write(struct buffer *buf, const char *s, int len)
1323 {
1324 if (buf->size - buf->pos < len) {
1325 buf->size += len + SZ;
1326 buf->p = realloc(buf->p, buf->size);
1327 }
1328 strncpy(buf->p + buf->pos, s, len);
1329 buf->pos += len;
1330 }
1331
1332 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1333 {
1334 const char *e = is_vmlinux(m) ?"":".ko";
1335
1336 switch (exp) {
1337 case export_gpl:
1338 fatal("modpost: GPL-incompatible module %s%s "
1339 "uses GPL-only symbol '%s'\n", m, e, s);
1340 break;
1341 case export_unused_gpl:
1342 fatal("modpost: GPL-incompatible module %s%s "
1343 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1344 break;
1345 case export_gpl_future:
1346 warn("modpost: GPL-incompatible module %s%s "
1347 "uses future GPL-only symbol '%s'\n", m, e, s);
1348 break;
1349 case export_plain:
1350 case export_unused:
1351 case export_unknown:
1352 /* ignore */
1353 break;
1354 }
1355 }
1356
1357 static void check_for_unused(enum export exp, const char* m, const char* s)
1358 {
1359 const char *e = is_vmlinux(m) ?"":".ko";
1360
1361 switch (exp) {
1362 case export_unused:
1363 case export_unused_gpl:
1364 warn("modpost: module %s%s "
1365 "uses symbol '%s' marked UNUSED\n", m, e, s);
1366 break;
1367 default:
1368 /* ignore */
1369 break;
1370 }
1371 }
1372
1373 static void check_exports(struct module *mod)
1374 {
1375 struct symbol *s, *exp;
1376
1377 for (s = mod->unres; s; s = s->next) {
1378 const char *basename;
1379 exp = find_symbol(s->name);
1380 if (!exp || exp->module == mod)
1381 continue;
1382 basename = strrchr(mod->name, '/');
1383 if (basename)
1384 basename++;
1385 else
1386 basename = mod->name;
1387 if (!mod->gpl_compatible)
1388 check_for_gpl_usage(exp->export, basename, exp->name);
1389 check_for_unused(exp->export, basename, exp->name);
1390 }
1391 }
1392
1393 /**
1394 * Header for the generated file
1395 **/
1396 static void add_header(struct buffer *b, struct module *mod)
1397 {
1398 buf_printf(b, "#include <linux/module.h>\n");
1399 buf_printf(b, "#include <linux/vermagic.h>\n");
1400 buf_printf(b, "#include <linux/compiler.h>\n");
1401 buf_printf(b, "\n");
1402 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1403 buf_printf(b, "\n");
1404 buf_printf(b, "struct module __this_module\n");
1405 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1406 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1407 if (mod->has_init)
1408 buf_printf(b, " .init = init_module,\n");
1409 if (mod->has_cleanup)
1410 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1411 " .exit = cleanup_module,\n"
1412 "#endif\n");
1413 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1414 buf_printf(b, "};\n");
1415 }
1416
1417 /**
1418 * Record CRCs for unresolved symbols
1419 **/
1420 static int add_versions(struct buffer *b, struct module *mod)
1421 {
1422 struct symbol *s, *exp;
1423 int err = 0;
1424
1425 for (s = mod->unres; s; s = s->next) {
1426 exp = find_symbol(s->name);
1427 if (!exp || exp->module == mod) {
1428 if (have_vmlinux && !s->weak) {
1429 if (warn_unresolved) {
1430 warn("\"%s\" [%s.ko] undefined!\n",
1431 s->name, mod->name);
1432 } else {
1433 merror("\"%s\" [%s.ko] undefined!\n",
1434 s->name, mod->name);
1435 err = 1;
1436 }
1437 }
1438 continue;
1439 }
1440 s->module = exp->module;
1441 s->crc_valid = exp->crc_valid;
1442 s->crc = exp->crc;
1443 }
1444
1445 if (!modversions)
1446 return err;
1447
1448 buf_printf(b, "\n");
1449 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1450 buf_printf(b, "__attribute_used__\n");
1451 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1452
1453 for (s = mod->unres; s; s = s->next) {
1454 if (!s->module) {
1455 continue;
1456 }
1457 if (!s->crc_valid) {
1458 warn("\"%s\" [%s.ko] has no CRC!\n",
1459 s->name, mod->name);
1460 continue;
1461 }
1462 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1463 }
1464
1465 buf_printf(b, "};\n");
1466
1467 return err;
1468 }
1469
1470 static void add_depends(struct buffer *b, struct module *mod,
1471 struct module *modules)
1472 {
1473 struct symbol *s;
1474 struct module *m;
1475 int first = 1;
1476
1477 for (m = modules; m; m = m->next) {
1478 m->seen = is_vmlinux(m->name);
1479 }
1480
1481 buf_printf(b, "\n");
1482 buf_printf(b, "static const char __module_depends[]\n");
1483 buf_printf(b, "__attribute_used__\n");
1484 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1485 buf_printf(b, "\"depends=");
1486 for (s = mod->unres; s; s = s->next) {
1487 const char *p;
1488 if (!s->module)
1489 continue;
1490
1491 if (s->module->seen)
1492 continue;
1493
1494 s->module->seen = 1;
1495 if ((p = strrchr(s->module->name, '/')) != NULL)
1496 p++;
1497 else
1498 p = s->module->name;
1499 buf_printf(b, "%s%s", first ? "" : ",", p);
1500 first = 0;
1501 }
1502 buf_printf(b, "\";\n");
1503 }
1504
1505 static void add_srcversion(struct buffer *b, struct module *mod)
1506 {
1507 if (mod->srcversion[0]) {
1508 buf_printf(b, "\n");
1509 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1510 mod->srcversion);
1511 }
1512 }
1513
1514 static void write_if_changed(struct buffer *b, const char *fname)
1515 {
1516 char *tmp;
1517 FILE *file;
1518 struct stat st;
1519
1520 file = fopen(fname, "r");
1521 if (!file)
1522 goto write;
1523
1524 if (fstat(fileno(file), &st) < 0)
1525 goto close_write;
1526
1527 if (st.st_size != b->pos)
1528 goto close_write;
1529
1530 tmp = NOFAIL(malloc(b->pos));
1531 if (fread(tmp, 1, b->pos, file) != b->pos)
1532 goto free_write;
1533
1534 if (memcmp(tmp, b->p, b->pos) != 0)
1535 goto free_write;
1536
1537 free(tmp);
1538 fclose(file);
1539 return;
1540
1541 free_write:
1542 free(tmp);
1543 close_write:
1544 fclose(file);
1545 write:
1546 file = fopen(fname, "w");
1547 if (!file) {
1548 perror(fname);
1549 exit(1);
1550 }
1551 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1552 perror(fname);
1553 exit(1);
1554 }
1555 fclose(file);
1556 }
1557
1558 /* parse Module.symvers file. line format:
1559 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1560 **/
1561 static void read_dump(const char *fname, unsigned int kernel)
1562 {
1563 unsigned long size, pos = 0;
1564 void *file = grab_file(fname, &size);
1565 char *line;
1566
1567 if (!file)
1568 /* No symbol versions, silently ignore */
1569 return;
1570
1571 while ((line = get_next_line(&pos, file, size))) {
1572 char *symname, *modname, *d, *export, *end;
1573 unsigned int crc;
1574 struct module *mod;
1575 struct symbol *s;
1576
1577 if (!(symname = strchr(line, '\t')))
1578 goto fail;
1579 *symname++ = '\0';
1580 if (!(modname = strchr(symname, '\t')))
1581 goto fail;
1582 *modname++ = '\0';
1583 if ((export = strchr(modname, '\t')) != NULL)
1584 *export++ = '\0';
1585 if (export && ((end = strchr(export, '\t')) != NULL))
1586 *end = '\0';
1587 crc = strtoul(line, &d, 16);
1588 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1589 goto fail;
1590
1591 if (!(mod = find_module(modname))) {
1592 if (is_vmlinux(modname)) {
1593 have_vmlinux = 1;
1594 }
1595 mod = new_module(NOFAIL(strdup(modname)));
1596 mod->skip = 1;
1597 }
1598 s = sym_add_exported(symname, mod, export_no(export));
1599 s->kernel = kernel;
1600 s->preloaded = 1;
1601 sym_update_crc(symname, mod, crc, export_no(export));
1602 }
1603 return;
1604 fail:
1605 fatal("parse error in symbol dump file\n");
1606 }
1607
1608 /* For normal builds always dump all symbols.
1609 * For external modules only dump symbols
1610 * that are not read from kernel Module.symvers.
1611 **/
1612 static int dump_sym(struct symbol *sym)
1613 {
1614 if (!external_module)
1615 return 1;
1616 if (sym->vmlinux || sym->kernel)
1617 return 0;
1618 return 1;
1619 }
1620
1621 static void write_dump(const char *fname)
1622 {
1623 struct buffer buf = { };
1624 struct symbol *symbol;
1625 int n;
1626
1627 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1628 symbol = symbolhash[n];
1629 while (symbol) {
1630 if (dump_sym(symbol))
1631 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1632 symbol->crc, symbol->name,
1633 symbol->module->name,
1634 export_str(symbol->export));
1635 symbol = symbol->next;
1636 }
1637 }
1638 write_if_changed(&buf, fname);
1639 }
1640
1641 int main(int argc, char **argv)
1642 {
1643 struct module *mod;
1644 struct buffer buf = { };
1645 char fname[SZ];
1646 char *kernel_read = NULL, *module_read = NULL;
1647 char *dump_write = NULL;
1648 int opt;
1649 int err;
1650
1651 while ((opt = getopt(argc, argv, "i:I:mso:aw")) != -1) {
1652 switch(opt) {
1653 case 'i':
1654 kernel_read = optarg;
1655 break;
1656 case 'I':
1657 module_read = optarg;
1658 external_module = 1;
1659 break;
1660 case 'm':
1661 modversions = 1;
1662 break;
1663 case 'o':
1664 dump_write = optarg;
1665 break;
1666 case 'a':
1667 all_versions = 1;
1668 break;
1669 case 's':
1670 vmlinux_section_warnings = 0;
1671 break;
1672 case 'w':
1673 warn_unresolved = 1;
1674 break;
1675 default:
1676 exit(1);
1677 }
1678 }
1679
1680 if (kernel_read)
1681 read_dump(kernel_read, 1);
1682 if (module_read)
1683 read_dump(module_read, 0);
1684
1685 while (optind < argc) {
1686 read_symbols(argv[optind++]);
1687 }
1688
1689 for (mod = modules; mod; mod = mod->next) {
1690 if (mod->skip)
1691 continue;
1692 check_exports(mod);
1693 }
1694
1695 err = 0;
1696
1697 for (mod = modules; mod; mod = mod->next) {
1698 if (mod->skip)
1699 continue;
1700
1701 buf.pos = 0;
1702
1703 add_header(&buf, mod);
1704 err |= add_versions(&buf, mod);
1705 add_depends(&buf, mod, modules);
1706 add_moddevtable(&buf, mod);
1707 add_srcversion(&buf, mod);
1708
1709 sprintf(fname, "%s.mod.c", mod->name);
1710 write_if_changed(&buf, fname);
1711 }
1712
1713 if (dump_write)
1714 write_dump(dump_write);
1715
1716 return err;
1717 }
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