1 /* Postprocess module symbol versions
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
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
11 * Usage: modpost vmlinux module1.o module2.o ...
16 #include "../../include/linux/license.h"
18 /* Are we using CONFIG_MODVERSIONS? */
20 /* Warn about undefined symbols? (do so if we have vmlinux) */
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 static int sec_mismatch_count = 0;
32 static int sec_mismatch_verbose = 1;
35 export_plain, export_unused, export_gpl,
36 export_unused_gpl, export_gpl_future, export_unknown
39 #define PRINTF __attribute__ ((format (printf, 1, 2)))
41 PRINTF void fatal(const char *fmt, ...)
45 fprintf(stderr, "FATAL: ");
47 va_start(arglist, fmt);
48 vfprintf(stderr, fmt, arglist);
54 PRINTF void warn(const char *fmt, ...)
58 fprintf(stderr, "WARNING: ");
60 va_start(arglist, fmt);
61 vfprintf(stderr, fmt, arglist);
65 PRINTF void merror(const char *fmt, ...)
69 fprintf(stderr, "ERROR: ");
71 va_start(arglist, fmt);
72 vfprintf(stderr, fmt, arglist);
76 static int is_vmlinux(const char *modname)
80 myname = strrchr(modname, '/');
86 return (strcmp(myname, "vmlinux") == 0) ||
87 (strcmp(myname, "vmlinux.o") == 0);
90 void *do_nofail(void *ptr, const char *expr)
93 fatal("modpost: Memory allocation failure: %s.\n", expr);
98 /* A list of all modules we processed */
99 static struct module *modules;
101 static struct module *find_module(char *modname)
105 for (mod = modules; mod; mod = mod->next)
106 if (strcmp(mod->name, modname) == 0)
111 static struct module *new_module(char *modname)
116 mod = NOFAIL(malloc(sizeof(*mod)));
117 memset(mod, 0, sizeof(*mod));
118 p = NOFAIL(strdup(modname));
120 /* strip trailing .o */
123 if (strcmp(s, ".o") == 0)
128 mod->gpl_compatible = -1;
135 /* A hash of all exported symbols,
136 * struct symbol is also used for lists of unresolved symbols */
138 #define SYMBOL_HASH_SIZE 1024
142 struct module *module;
146 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
147 unsigned int kernel:1; /* 1 if symbol is from kernel
148 * (only for external modules) **/
149 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
150 enum export export; /* Type of export */
154 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
156 /* This is based on the hash agorithm from gdbm, via tdb */
157 static inline unsigned int tdb_hash(const char *name)
159 unsigned value; /* Used to compute the hash value. */
160 unsigned i; /* Used to cycle through random values. */
162 /* Set the initial value from the key size. */
163 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
164 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
166 return (1103515243 * value + 12345);
170 * Allocate a new symbols for use in the hash of exported symbols or
171 * the list of unresolved symbols per module
173 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
176 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
178 memset(s, 0, sizeof(*s));
179 strcpy(s->name, name);
185 /* For the hash of exported symbols */
186 static struct symbol *new_symbol(const char *name, struct module *module,
192 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
193 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
194 new->module = module;
195 new->export = export;
199 static struct symbol *find_symbol(const char *name)
203 /* For our purposes, .foo matches foo. PPC64 needs this. */
207 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
208 if (strcmp(s->name, name) == 0)
218 { .str = "EXPORT_SYMBOL", .export = export_plain },
219 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
220 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
221 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
222 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
223 { .str = "(unknown)", .export = export_unknown },
227 static const char *export_str(enum export ex)
229 return export_list[ex].str;
232 static enum export export_no(const char *s)
237 return export_unknown;
238 for (i = 0; export_list[i].export != export_unknown; i++) {
239 if (strcmp(export_list[i].str, s) == 0)
240 return export_list[i].export;
242 return export_unknown;
245 static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
247 if (sec == elf->export_sec)
249 else if (sec == elf->export_unused_sec)
250 return export_unused;
251 else if (sec == elf->export_gpl_sec)
253 else if (sec == elf->export_unused_gpl_sec)
254 return export_unused_gpl;
255 else if (sec == elf->export_gpl_future_sec)
256 return export_gpl_future;
258 return export_unknown;
262 * Add an exported symbol - it may have already been added without a
263 * CRC, in this case just update the CRC
265 static struct symbol *sym_add_exported(const char *name, struct module *mod,
268 struct symbol *s = find_symbol(name);
271 s = new_symbol(name, mod, export);
274 warn("%s: '%s' exported twice. Previous export "
275 "was in %s%s\n", mod->name, name,
277 is_vmlinux(s->module->name) ?"":".ko");
279 /* In case Modules.symvers was out of date */
284 s->vmlinux = is_vmlinux(mod->name);
290 static void sym_update_crc(const char *name, struct module *mod,
291 unsigned int crc, enum export export)
293 struct symbol *s = find_symbol(name);
296 s = new_symbol(name, mod, export);
301 void *grab_file(const char *filename, unsigned long *size)
307 fd = open(filename, O_RDONLY);
308 if (fd < 0 || fstat(fd, &st) != 0)
312 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
315 if (map == MAP_FAILED)
321 * Return a copy of the next line in a mmap'ed file.
322 * spaces in the beginning of the line is trimmed away.
323 * Return a pointer to a static buffer.
325 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
327 static char line[4096];
330 signed char *p = (signed char *)file + *pos;
333 for (; *pos < size ; (*pos)++) {
334 if (skip && isspace(*p)) {
339 if (*p != '\n' && (*pos < size)) {
343 break; /* Too long, stop */
354 void release_file(void *file, unsigned long size)
359 static int parse_elf(struct elf_info *info, const char *filename)
366 hdr = grab_file(filename, &info->size);
372 if (info->size < sizeof(*hdr)) {
373 /* file too small, assume this is an empty .o file */
376 /* Is this a valid ELF file? */
377 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
378 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
379 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
380 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
381 /* Not an ELF file - silently ignore it */
384 /* Fix endianness in ELF header */
385 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
386 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
387 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
388 hdr->e_machine = TO_NATIVE(hdr->e_machine);
389 hdr->e_type = TO_NATIVE(hdr->e_type);
390 sechdrs = (void *)hdr + hdr->e_shoff;
391 info->sechdrs = sechdrs;
393 /* Check if file offset is correct */
394 if (hdr->e_shoff > info->size) {
395 fatal("section header offset=%lu in file '%s' is bigger than "
396 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
397 filename, info->size);
401 /* Fix endianness in section headers */
402 for (i = 0; i < hdr->e_shnum; i++) {
403 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
404 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
405 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
406 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
407 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
408 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
409 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
411 /* Find symbol table. */
412 for (i = 1; i < hdr->e_shnum; i++) {
413 const char *secstrings
414 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
417 if (sechdrs[i].sh_offset > info->size) {
418 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
419 "sizeof(*hrd)=%zu\n", filename,
420 (unsigned long)sechdrs[i].sh_offset,
424 secname = secstrings + sechdrs[i].sh_name;
425 if (strcmp(secname, ".modinfo") == 0) {
426 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
427 info->modinfo_len = sechdrs[i].sh_size;
428 } else if (strcmp(secname, "__ksymtab") == 0)
429 info->export_sec = i;
430 else if (strcmp(secname, "__ksymtab_unused") == 0)
431 info->export_unused_sec = i;
432 else if (strcmp(secname, "__ksymtab_gpl") == 0)
433 info->export_gpl_sec = i;
434 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
435 info->export_unused_gpl_sec = i;
436 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
437 info->export_gpl_future_sec = i;
439 if (sechdrs[i].sh_type != SHT_SYMTAB)
442 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
443 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
444 + sechdrs[i].sh_size;
445 info->strtab = (void *)hdr +
446 sechdrs[sechdrs[i].sh_link].sh_offset;
448 if (!info->symtab_start)
449 fatal("%s has no symtab?\n", filename);
451 /* Fix endianness in symbols */
452 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
453 sym->st_shndx = TO_NATIVE(sym->st_shndx);
454 sym->st_name = TO_NATIVE(sym->st_name);
455 sym->st_value = TO_NATIVE(sym->st_value);
456 sym->st_size = TO_NATIVE(sym->st_size);
461 static void parse_elf_finish(struct elf_info *info)
463 release_file(info->hdr, info->size);
466 #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
467 #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
469 static void handle_modversions(struct module *mod, struct elf_info *info,
470 Elf_Sym *sym, const char *symname)
473 enum export export = export_from_sec(info, sym->st_shndx);
475 switch (sym->st_shndx) {
477 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
481 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
482 crc = (unsigned int) sym->st_value;
483 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
488 /* undefined symbol */
489 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
490 ELF_ST_BIND(sym->st_info) != STB_WEAK)
492 /* ignore global offset table */
493 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
495 /* ignore __this_module, it will be resolved shortly */
496 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
498 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
499 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
500 /* add compatibility with older glibc */
501 #ifndef STT_SPARC_REGISTER
502 #define STT_SPARC_REGISTER STT_REGISTER
504 if (info->hdr->e_machine == EM_SPARC ||
505 info->hdr->e_machine == EM_SPARCV9) {
506 /* Ignore register directives. */
507 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
509 if (symname[0] == '.') {
510 char *munged = strdup(symname);
512 munged[1] = toupper(munged[1]);
518 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
519 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
521 alloc_symbol(symname +
522 strlen(MODULE_SYMBOL_PREFIX),
523 ELF_ST_BIND(sym->st_info) == STB_WEAK,
528 /* All exported symbols */
529 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
530 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
533 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
535 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
536 mod->has_cleanup = 1;
542 * Parse tag=value strings from .modinfo section
544 static char *next_string(char *string, unsigned long *secsize)
546 /* Skip non-zero chars */
549 if ((*secsize)-- <= 1)
553 /* Skip any zero padding. */
556 if ((*secsize)-- <= 1)
562 static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
563 const char *tag, char *info)
566 unsigned int taglen = strlen(tag);
567 unsigned long size = modinfo_len;
570 size -= info - (char *)modinfo;
571 modinfo = next_string(info, &size);
574 for (p = modinfo; p; p = next_string(p, &size)) {
575 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
576 return p + taglen + 1;
581 static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
585 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
589 * Test if string s ends in string sub
592 static int strrcmp(const char *s, const char *sub)
600 sublen = strlen(sub);
602 if ((slen == 0) || (sublen == 0))
608 return memcmp(s + slen - sublen, sub, sublen);
611 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
614 return elf->strtab + sym->st_name;
619 static const char *sec_name(struct elf_info *elf, int shndx)
621 Elf_Shdr *sechdrs = elf->sechdrs;
622 return (void *)elf->hdr +
623 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
624 sechdrs[shndx].sh_name;
627 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
629 return (void *)elf->hdr +
630 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
634 /* if sym is empty or point to a string
635 * like ".[0-9]+" then return 1.
636 * This is the optional prefix added by ld to some sections
638 static int number_prefix(const char *sym)
646 if (c < '0' || c > '9')
652 /* The pattern is an array of simple patterns.
653 * "foo" will match an exact string equal to "foo"
654 * "*foo" will match a string that ends with "foo"
655 * "foo*" will match a string that begins with "foo"
656 * "foo$" will match a string equal to "foo" or "foo.1"
657 * where the '1' can be any number including several digits.
658 * The $ syntax is for sections where ld append a dot number
659 * to make section name unique.
661 int match(const char *sym, const char * const pat[])
666 const char *endp = p + strlen(p) - 1;
670 if (strrcmp(sym, p + 1) == 0)
674 else if (*endp == '*') {
675 if (strncmp(sym, p, strlen(p) - 1) == 0)
679 else if (*endp == '$') {
680 if (strncmp(sym, p, strlen(p) - 1) == 0) {
681 if (number_prefix(sym + strlen(p) - 1))
687 if (strcmp(p, sym) == 0)
695 /* sections that we do not want to do full section mismatch check on */
696 static const char *section_white_list[] =
697 { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL };
700 * Is this section one we do not want to check?
701 * This is often debug sections.
702 * If we are going to check this section then
703 * test if section name ends with a dot and a number.
704 * This is used to find sections where the linker have
705 * appended a dot-number to make the name unique.
706 * The cause of this is often a section specified in assembler
707 * without "ax" / "aw" and the same section used in .c
708 * code where gcc add these.
710 static int check_section(const char *modname, const char *sec)
712 const char *e = sec + strlen(sec) - 1;
713 if (match(sec, section_white_list))
716 if (*e && isdigit(*e)) {
717 /* consume all digits */
718 while (*e && e != sec && isdigit(*e))
721 warn("%s (%s): unexpected section name.\n"
722 "The (.[number]+) following section name are "
723 "ld generated and not expected.\n"
724 "Did you forget to use \"ax\"/\"aw\" "
726 "Note that for example <linux/init.h> contains\n"
727 "section definitions for use in .S files.\n\n",
736 #define ALL_INIT_DATA_SECTIONS \
737 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
738 #define ALL_EXIT_DATA_SECTIONS \
739 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
741 #define ALL_INIT_TEXT_SECTIONS \
742 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
743 #define ALL_EXIT_TEXT_SECTIONS \
744 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
746 #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS
747 #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS
749 #define DATA_SECTIONS ".data$", ".data.rel$"
750 #define TEXT_SECTIONS ".text$"
752 #define INIT_SECTIONS ".init.data$", ".init.text$"
753 #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$"
754 #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$"
755 #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$"
757 #define EXIT_SECTIONS ".exit.data$", ".exit.text$"
758 #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$"
759 #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$"
760 #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$"
762 /* init data sections */
763 static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
765 /* all init sections */
766 static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
768 /* All init and exit sections (code + data) */
769 static const char *init_exit_sections[] =
770 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
773 static const char *data_sections[] = { DATA_SECTIONS, NULL };
775 /* sections that may refer to an init/exit section with no warning */
776 static const char *initref_sections[] =
785 /* symbols in .data that may refer to init/exit sections */
786 static const char *symbol_white_list[] =
789 "*_template", /* scsi uses *_template a lot */
790 "*_timer", /* arm uses ops structures named _timer a lot */
791 "*_sht", /* scsi also used *_sht to some extent */
799 static const char *head_sections[] = { ".head.text*", NULL };
800 static const char *linker_symbols[] =
801 { "__init_begin", "_sinittext", "_einittext", NULL };
816 struct sectioncheck {
817 const char *fromsec[20];
818 const char *tosec[20];
819 enum mismatch mismatch;
822 const struct sectioncheck sectioncheck[] = {
823 /* Do not reference init/exit code/data from
824 * normal code and data
827 .fromsec = { TEXT_SECTIONS, NULL },
828 .tosec = { ALL_INIT_SECTIONS, NULL },
829 .mismatch = TEXT_TO_INIT,
832 .fromsec = { DATA_SECTIONS, NULL },
833 .tosec = { ALL_INIT_SECTIONS, NULL },
834 .mismatch = DATA_TO_INIT,
837 .fromsec = { TEXT_SECTIONS, NULL },
838 .tosec = { ALL_EXIT_SECTIONS, NULL },
839 .mismatch = TEXT_TO_EXIT,
842 .fromsec = { DATA_SECTIONS, NULL },
843 .tosec = { ALL_EXIT_SECTIONS, NULL },
844 .mismatch = DATA_TO_EXIT,
846 /* Do not reference init code/data from devinit/cpuinit/meminit code/data */
848 .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL },
849 .tosec = { INIT_SECTIONS, NULL },
850 .mismatch = XXXINIT_TO_INIT,
852 /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
854 .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
855 .tosec = { EXIT_SECTIONS, NULL },
856 .mismatch = XXXEXIT_TO_EXIT,
858 /* Do not use exit code/data from init code */
860 .fromsec = { ALL_INIT_SECTIONS, NULL },
861 .tosec = { ALL_EXIT_SECTIONS, NULL },
862 .mismatch = INIT_TO_EXIT,
864 /* Do not use init code/data from exit code */
866 .fromsec = { ALL_EXIT_SECTIONS, NULL },
867 .tosec = { ALL_INIT_SECTIONS, NULL },
868 .mismatch = EXIT_TO_INIT,
870 /* Do not export init/exit functions or data */
872 .fromsec = { "__ksymtab*", NULL },
873 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
874 .mismatch = EXPORT_TO_INIT_EXIT
878 static int section_mismatch(const char *fromsec, const char *tosec)
881 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
882 const struct sectioncheck *check = §ioncheck[0];
884 for (i = 0; i < elems; i++) {
885 if (match(fromsec, check->fromsec) &&
886 match(tosec, check->tosec))
887 return check->mismatch;
894 * Whitelist to allow certain references to pass with no warning.
897 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
898 * The pattern is identified by:
899 * fromsec = .text.init.refok* | .data.init.refok*
902 * If a module parameter is declared __initdata and permissions=0
903 * then this is legal despite the warning generated.
904 * We cannot see value of permissions here, so just ignore
906 * The pattern is identified by:
912 * Many drivers utilise a *driver container with references to
913 * add, remove, probe functions etc.
914 * These functions may often be marked __init and we do not want to
916 * the pattern is identified by:
917 * tosec = init or exit section
918 * fromsec = data section
919 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
920 * *probe_one, *_console, *_timer
923 * Whitelist all refereces from .text.head to .init.data
924 * Whitelist all refereces from .text.head to .init.text
927 * Some symbols belong to init section but still it is ok to reference
928 * these from non-init sections as these symbols don't have any memory
929 * allocated for them and symbol address and value are same. So even
930 * if init section is freed, its ok to reference those symbols.
931 * For ex. symbols marking the init section boundaries.
932 * This pattern is identified by
933 * refsymname = __init_begin, _sinittext, _einittext
936 static int secref_whitelist(const char *fromsec, const char *fromsym,
937 const char *tosec, const char *tosym)
939 /* Check for pattern 0 */
940 if (match(fromsec, initref_sections))
943 /* Check for pattern 1 */
944 if (match(tosec, init_data_sections) &&
945 match(fromsec, data_sections) &&
946 (strncmp(fromsym, "__param", strlen("__param")) == 0))
949 /* Check for pattern 2 */
950 if (match(tosec, init_exit_sections) &&
951 match(fromsec, data_sections) &&
952 match(fromsym, symbol_white_list))
955 /* Check for pattern 3 */
956 if (match(fromsec, head_sections) &&
957 match(tosec, init_sections))
960 /* Check for pattern 4 */
961 if (match(tosym, linker_symbols))
968 * Find symbol based on relocation record info.
969 * In some cases the symbol supplied is a valid symbol so
970 * return refsym. If st_name != 0 we assume this is a valid symbol.
971 * In other cases the symbol needs to be looked up in the symbol table
972 * based on section and address.
974 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
978 Elf_Sym *near = NULL;
979 Elf64_Sword distance = 20;
982 if (relsym->st_name != 0)
984 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
985 if (sym->st_shndx != relsym->st_shndx)
987 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
989 if (sym->st_value == addr)
991 /* Find a symbol nearby - addr are maybe negative */
992 d = sym->st_value - addr;
994 d = addr - sym->st_value;
1000 /* We need a close match */
1007 static inline int is_arm_mapping_symbol(const char *str)
1009 return str[0] == '$' && strchr("atd", str[1])
1010 && (str[2] == '\0' || str[2] == '.');
1014 * If there's no name there, ignore it; likewise, ignore it if it's
1015 * one of the magic symbols emitted used by current ARM tools.
1017 * Otherwise if find_symbols_between() returns those symbols, they'll
1018 * fail the whitelist tests and cause lots of false alarms ... fixable
1019 * only by merging __exit and __init sections into __text, bloating
1020 * the kernel (which is especially evil on embedded platforms).
1022 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1024 const char *name = elf->strtab + sym->st_name;
1026 if (!name || !strlen(name))
1028 return !is_arm_mapping_symbol(name);
1032 * Find symbols before or equal addr and after addr - in the section sec.
1033 * If we find two symbols with equal offset prefer one with a valid name.
1034 * The ELF format may have a better way to detect what type of symbol
1035 * it is, but this works for now.
1037 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1041 Elf_Sym *near = NULL;
1042 Elf_Addr distance = ~0;
1044 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1047 if (sym->st_shndx >= SHN_LORESERVE)
1049 symsec = sec_name(elf, sym->st_shndx);
1050 if (strcmp(symsec, sec) != 0)
1052 if (!is_valid_name(elf, sym))
1054 if (sym->st_value <= addr) {
1055 if ((addr - sym->st_value) < distance) {
1056 distance = addr - sym->st_value;
1058 } else if ((addr - sym->st_value) == distance) {
1067 * Convert a section name to the function/data attribute
1068 * .init.text => __init
1069 * .cpuinit.data => __cpudata
1070 * .memexitconst => __memconst
1073 static char *sec2annotation(const char *s)
1075 if (match(s, init_exit_sections)) {
1076 char *p = malloc(20);
1083 while (*s && *s != '.')
1088 if (strstr(s, "rodata") != NULL)
1089 strcat(p, "const ");
1090 else if (strstr(s, "data") != NULL)
1094 return r; /* we leak her but we do not care */
1100 static int is_function(Elf_Sym *sym)
1103 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1109 * Print a warning about a section mismatch.
1110 * Try to find symbols near it so user can find it.
1111 * Check whitelist before warning - it may be a false positive.
1113 static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
1114 const char *fromsec,
1115 unsigned long long fromaddr,
1116 const char *fromsym,
1118 const char *tosec, const char *tosym,
1121 const char *from, *from_p;
1122 const char *to, *to_p;
1123 from = from_is_func ? "function" : "variable";
1124 from_p = from_is_func ? "()" : "";
1125 to = to_is_func ? "function" : "variable";
1126 to_p = to_is_func ? "()" : "";
1128 sec_mismatch_count++;
1129 if (!sec_mismatch_verbose)
1132 fprintf(stderr, "WARNING: %s(%s+0x%llx): Section mismatch in"
1133 " reference from the %s %s%s to the %s %s:%s%s\n",
1134 modname, fromsec, fromaddr, from, fromsym, from_p,
1135 to, tosec, tosym, to_p);
1140 "The function %s %s() references\n"
1142 "This is often because %s lacks a %s\n"
1143 "annotation or the annotation of %s is wrong.\n",
1144 sec2annotation(fromsec), fromsym,
1145 to, sec2annotation(tosec), tosym, to_p,
1146 fromsym, sec2annotation(tosec), tosym);
1148 case DATA_TO_INIT: {
1149 const char **s = symbol_white_list;
1151 "The variable %s references\n"
1153 "If the reference is valid then annotate the\n"
1154 "variable with __init* (see linux/init.h) "
1155 "or name the variable:\n",
1156 fromsym, to, sec2annotation(tosec), tosym, to_p);
1158 fprintf(stderr, "%s, ", *s++);
1159 fprintf(stderr, "\n");
1164 "The function %s() references a %s in an exit section.\n"
1165 "Often the %s %s%s has valid usage outside the exit section\n"
1166 "and the fix is to remove the %sannotation of %s.\n",
1167 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
1169 case DATA_TO_EXIT: {
1170 const char **s = symbol_white_list;
1172 "The variable %s references\n"
1174 "If the reference is valid then annotate the\n"
1175 "variable with __exit* (see linux/init.h) or "
1176 "name the variable:\n",
1177 fromsym, to, sec2annotation(tosec), tosym, to_p);
1179 fprintf(stderr, "%s, ", *s++);
1180 fprintf(stderr, "\n");
1183 case XXXINIT_TO_INIT:
1184 case XXXEXIT_TO_EXIT:
1186 "The %s %s%s%s references\n"
1188 "If %s is only used by %s then\n"
1189 "annotate %s with a matching annotation.\n",
1190 from, sec2annotation(fromsec), fromsym, from_p,
1191 to, sec2annotation(tosec), tosym, to_p,
1192 fromsym, tosym, fromsym);
1196 "The %s %s%s%s references\n"
1198 "This is often seen when error handling "
1199 "in the init function\n"
1200 "uses functionality in the exit path.\n"
1201 "The fix is often to remove the %sannotation of\n"
1202 "%s%s so it may be used outside an exit section.\n",
1203 from, sec2annotation(fromsec), fromsym, from_p,
1204 to, sec2annotation(tosec), tosym, to_p,
1205 sec2annotation(tosec), tosym, to_p);
1209 "The %s %s%s%s references\n"
1211 "This is often seen when error handling "
1212 "in the exit function\n"
1213 "uses functionality in the init path.\n"
1214 "The fix is often to remove the %sannotation of\n"
1215 "%s%s so it may be used outside an init section.\n",
1216 from, sec2annotation(fromsec), fromsym, from_p,
1217 to, sec2annotation(tosec), tosym, to_p,
1218 sec2annotation(tosec), tosym, to_p);
1220 case EXPORT_TO_INIT_EXIT:
1222 "The symbol %s is exported and annotated %s\n"
1223 "Fix this by removing the %sannotation of %s "
1224 "or drop the export.\n",
1225 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
1227 /* To get warnings on missing members */
1230 fprintf(stderr, "\n");
1233 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1234 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1237 enum mismatch mismatch;
1239 tosec = sec_name(elf, sym->st_shndx);
1240 mismatch = section_mismatch(fromsec, tosec);
1241 if (mismatch != NO_MISMATCH) {
1245 const char *fromsym;
1247 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1248 fromsym = sym_name(elf, from);
1249 to = find_elf_symbol(elf, r->r_addend, sym);
1250 tosym = sym_name(elf, to);
1252 /* check whitelist - we may ignore it */
1253 if (secref_whitelist(fromsec, fromsym, tosec, tosym)) {
1254 report_sec_mismatch(modname, mismatch,
1255 fromsec, r->r_offset, fromsym,
1256 is_function(from), tosec, tosym,
1262 static unsigned int *reloc_location(struct elf_info *elf,
1263 Elf_Shdr *sechdr, Elf_Rela *r)
1265 Elf_Shdr *sechdrs = elf->sechdrs;
1266 int section = sechdr->sh_info;
1268 return (void *)elf->hdr + sechdrs[section].sh_offset +
1269 (r->r_offset - sechdrs[section].sh_addr);
1272 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1274 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1275 unsigned int *location = reloc_location(elf, sechdr, r);
1279 r->r_addend = TO_NATIVE(*location);
1282 r->r_addend = TO_NATIVE(*location) + 4;
1283 /* For CONFIG_RELOCATABLE=y */
1284 if (elf->hdr->e_type == ET_EXEC)
1285 r->r_addend += r->r_offset;
1291 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1293 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1297 /* From ARM ABI: (S + A) | T */
1298 r->r_addend = (int)(long)
1299 (elf->symtab_start + ELF_R_SYM(r->r_info));
1302 /* From ARM ABI: ((S + A) | T) - P */
1303 r->r_addend = (int)(long)(elf->hdr +
1305 (r->r_offset - sechdr->sh_addr));
1313 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1315 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1316 unsigned int *location = reloc_location(elf, sechdr, r);
1319 if (r_typ == R_MIPS_HI16)
1320 return 1; /* skip this */
1321 inst = TO_NATIVE(*location);
1324 r->r_addend = inst & 0xffff;
1327 r->r_addend = (inst & 0x03ffffff) << 2;
1336 static void section_rela(const char *modname, struct elf_info *elf,
1343 const char *fromsec;
1345 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1346 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1348 fromsec = sech_name(elf, sechdr);
1349 fromsec += strlen(".rela");
1350 /* if from section (name) is know good then skip it */
1351 if (check_section(modname, fromsec))
1354 for (rela = start; rela < stop; rela++) {
1355 r.r_offset = TO_NATIVE(rela->r_offset);
1356 #if KERNEL_ELFCLASS == ELFCLASS64
1357 if (elf->hdr->e_machine == EM_MIPS) {
1359 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1360 r_sym = TO_NATIVE(r_sym);
1361 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1362 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1364 r.r_info = TO_NATIVE(rela->r_info);
1365 r_sym = ELF_R_SYM(r.r_info);
1368 r.r_info = TO_NATIVE(rela->r_info);
1369 r_sym = ELF_R_SYM(r.r_info);
1371 r.r_addend = TO_NATIVE(rela->r_addend);
1372 sym = elf->symtab_start + r_sym;
1373 /* Skip special sections */
1374 if (sym->st_shndx >= SHN_LORESERVE)
1376 check_section_mismatch(modname, elf, &r, sym, fromsec);
1380 static void section_rel(const char *modname, struct elf_info *elf,
1387 const char *fromsec;
1389 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1390 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1392 fromsec = sech_name(elf, sechdr);
1393 fromsec += strlen(".rel");
1394 /* if from section (name) is know good then skip it */
1395 if (check_section(modname, fromsec))
1398 for (rel = start; rel < stop; rel++) {
1399 r.r_offset = TO_NATIVE(rel->r_offset);
1400 #if KERNEL_ELFCLASS == ELFCLASS64
1401 if (elf->hdr->e_machine == EM_MIPS) {
1403 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1404 r_sym = TO_NATIVE(r_sym);
1405 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1406 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1408 r.r_info = TO_NATIVE(rel->r_info);
1409 r_sym = ELF_R_SYM(r.r_info);
1412 r.r_info = TO_NATIVE(rel->r_info);
1413 r_sym = ELF_R_SYM(r.r_info);
1416 switch (elf->hdr->e_machine) {
1418 if (addend_386_rel(elf, sechdr, &r))
1422 if (addend_arm_rel(elf, sechdr, &r))
1426 if (addend_mips_rel(elf, sechdr, &r))
1430 sym = elf->symtab_start + r_sym;
1431 /* Skip special sections */
1432 if (sym->st_shndx >= SHN_LORESERVE)
1434 check_section_mismatch(modname, elf, &r, sym, fromsec);
1439 * A module includes a number of sections that are discarded
1440 * either when loaded or when used as built-in.
1441 * For loaded modules all functions marked __init and all data
1442 * marked __initdata will be discarded when the module has been intialized.
1443 * Likewise for modules used built-in the sections marked __exit
1444 * are discarded because __exit marked function are supposed to be called
1445 * only when a moduel is unloaded which never happes for built-in modules.
1446 * The check_sec_ref() function traverses all relocation records
1447 * to find all references to a section that reference a section that will
1448 * be discarded and warns about it.
1450 static void check_sec_ref(struct module *mod, const char *modname,
1451 struct elf_info *elf)
1454 Elf_Shdr *sechdrs = elf->sechdrs;
1456 /* Walk through all sections */
1457 for (i = 0; i < elf->hdr->e_shnum; i++) {
1458 /* We want to process only relocation sections and not .init */
1459 if (sechdrs[i].sh_type == SHT_RELA)
1460 section_rela(modname, elf, &elf->sechdrs[i]);
1461 else if (sechdrs[i].sh_type == SHT_REL)
1462 section_rel(modname, elf, &elf->sechdrs[i]);
1466 static void read_symbols(char *modname)
1468 const char *symname;
1472 struct elf_info info = { };
1475 if (!parse_elf(&info, modname))
1478 mod = new_module(modname);
1480 /* When there's no vmlinux, don't print warnings about
1481 * unresolved symbols (since there'll be too many ;) */
1482 if (is_vmlinux(modname)) {
1487 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1489 if (license_is_gpl_compatible(license))
1490 mod->gpl_compatible = 1;
1492 mod->gpl_compatible = 0;
1495 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1496 "license", license);
1499 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1500 symname = info.strtab + sym->st_name;
1502 handle_modversions(mod, &info, sym, symname);
1503 handle_moddevtable(mod, &info, sym, symname);
1505 if (!is_vmlinux(modname) ||
1506 (is_vmlinux(modname) && vmlinux_section_warnings))
1507 check_sec_ref(mod, modname, &info);
1509 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1511 maybe_frob_rcs_version(modname, version, info.modinfo,
1512 version - (char *)info.hdr);
1513 if (version || (all_versions && !is_vmlinux(modname)))
1514 get_src_version(modname, mod->srcversion,
1515 sizeof(mod->srcversion)-1);
1517 parse_elf_finish(&info);
1519 /* Our trick to get versioning for struct_module - it's
1520 * never passed as an argument to an exported function, so
1521 * the automatic versioning doesn't pick it up, but it's really
1522 * important anyhow */
1524 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1529 /* We first write the generated file into memory using the
1530 * following helper, then compare to the file on disk and
1531 * only update the later if anything changed */
1533 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1534 const char *fmt, ...)
1541 len = vsnprintf(tmp, SZ, fmt, ap);
1542 buf_write(buf, tmp, len);
1546 void buf_write(struct buffer *buf, const char *s, int len)
1548 if (buf->size - buf->pos < len) {
1549 buf->size += len + SZ;
1550 buf->p = realloc(buf->p, buf->size);
1552 strncpy(buf->p + buf->pos, s, len);
1556 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1558 const char *e = is_vmlinux(m) ?"":".ko";
1562 fatal("modpost: GPL-incompatible module %s%s "
1563 "uses GPL-only symbol '%s'\n", m, e, s);
1565 case export_unused_gpl:
1566 fatal("modpost: GPL-incompatible module %s%s "
1567 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1569 case export_gpl_future:
1570 warn("modpost: GPL-incompatible module %s%s "
1571 "uses future GPL-only symbol '%s'\n", m, e, s);
1575 case export_unknown:
1581 static void check_for_unused(enum export exp, const char *m, const char *s)
1583 const char *e = is_vmlinux(m) ?"":".ko";
1587 case export_unused_gpl:
1588 warn("modpost: module %s%s "
1589 "uses symbol '%s' marked UNUSED\n", m, e, s);
1597 static void check_exports(struct module *mod)
1599 struct symbol *s, *exp;
1601 for (s = mod->unres; s; s = s->next) {
1602 const char *basename;
1603 exp = find_symbol(s->name);
1604 if (!exp || exp->module == mod)
1606 basename = strrchr(mod->name, '/');
1610 basename = mod->name;
1611 if (!mod->gpl_compatible)
1612 check_for_gpl_usage(exp->export, basename, exp->name);
1613 check_for_unused(exp->export, basename, exp->name);
1618 * Header for the generated file
1620 static void add_header(struct buffer *b, struct module *mod)
1622 buf_printf(b, "#include <linux/module.h>\n");
1623 buf_printf(b, "#include <linux/vermagic.h>\n");
1624 buf_printf(b, "#include <linux/compiler.h>\n");
1625 buf_printf(b, "\n");
1626 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1627 buf_printf(b, "\n");
1628 buf_printf(b, "struct module __this_module\n");
1629 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
1630 buf_printf(b, " .name = KBUILD_MODNAME,\n");
1632 buf_printf(b, " .init = init_module,\n");
1633 if (mod->has_cleanup)
1634 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1635 " .exit = cleanup_module,\n"
1637 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
1638 buf_printf(b, "};\n");
1642 * Record CRCs for unresolved symbols
1644 static int add_versions(struct buffer *b, struct module *mod)
1646 struct symbol *s, *exp;
1649 for (s = mod->unres; s; s = s->next) {
1650 exp = find_symbol(s->name);
1651 if (!exp || exp->module == mod) {
1652 if (have_vmlinux && !s->weak) {
1653 if (warn_unresolved) {
1654 warn("\"%s\" [%s.ko] undefined!\n",
1655 s->name, mod->name);
1657 merror("\"%s\" [%s.ko] undefined!\n",
1658 s->name, mod->name);
1664 s->module = exp->module;
1665 s->crc_valid = exp->crc_valid;
1672 buf_printf(b, "\n");
1673 buf_printf(b, "static const struct modversion_info ____versions[]\n");
1674 buf_printf(b, "__used\n");
1675 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1677 for (s = mod->unres; s; s = s->next) {
1680 if (!s->crc_valid) {
1681 warn("\"%s\" [%s.ko] has no CRC!\n",
1682 s->name, mod->name);
1685 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1688 buf_printf(b, "};\n");
1693 static void add_depends(struct buffer *b, struct module *mod,
1694 struct module *modules)
1700 for (m = modules; m; m = m->next)
1701 m->seen = is_vmlinux(m->name);
1703 buf_printf(b, "\n");
1704 buf_printf(b, "static const char __module_depends[]\n");
1705 buf_printf(b, "__used\n");
1706 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1707 buf_printf(b, "\"depends=");
1708 for (s = mod->unres; s; s = s->next) {
1713 if (s->module->seen)
1716 s->module->seen = 1;
1717 p = strrchr(s->module->name, '/');
1721 p = s->module->name;
1722 buf_printf(b, "%s%s", first ? "" : ",", p);
1725 buf_printf(b, "\";\n");
1728 static void add_srcversion(struct buffer *b, struct module *mod)
1730 if (mod->srcversion[0]) {
1731 buf_printf(b, "\n");
1732 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1737 static void write_if_changed(struct buffer *b, const char *fname)
1743 file = fopen(fname, "r");
1747 if (fstat(fileno(file), &st) < 0)
1750 if (st.st_size != b->pos)
1753 tmp = NOFAIL(malloc(b->pos));
1754 if (fread(tmp, 1, b->pos, file) != b->pos)
1757 if (memcmp(tmp, b->p, b->pos) != 0)
1769 file = fopen(fname, "w");
1774 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1781 /* parse Module.symvers file. line format:
1782 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
1784 static void read_dump(const char *fname, unsigned int kernel)
1786 unsigned long size, pos = 0;
1787 void *file = grab_file(fname, &size);
1791 /* No symbol versions, silently ignore */
1794 while ((line = get_next_line(&pos, file, size))) {
1795 char *symname, *modname, *d, *export, *end;
1800 if (!(symname = strchr(line, '\t')))
1803 if (!(modname = strchr(symname, '\t')))
1806 if ((export = strchr(modname, '\t')) != NULL)
1808 if (export && ((end = strchr(export, '\t')) != NULL))
1810 crc = strtoul(line, &d, 16);
1811 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1813 mod = find_module(modname);
1815 if (is_vmlinux(modname))
1817 mod = new_module(NOFAIL(strdup(modname)));
1820 s = sym_add_exported(symname, mod, export_no(export));
1823 sym_update_crc(symname, mod, crc, export_no(export));
1827 fatal("parse error in symbol dump file\n");
1830 /* For normal builds always dump all symbols.
1831 * For external modules only dump symbols
1832 * that are not read from kernel Module.symvers.
1834 static int dump_sym(struct symbol *sym)
1836 if (!external_module)
1838 if (sym->vmlinux || sym->kernel)
1843 static void write_dump(const char *fname)
1845 struct buffer buf = { };
1846 struct symbol *symbol;
1849 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1850 symbol = symbolhash[n];
1852 if (dump_sym(symbol))
1853 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
1854 symbol->crc, symbol->name,
1855 symbol->module->name,
1856 export_str(symbol->export));
1857 symbol = symbol->next;
1860 write_if_changed(&buf, fname);
1863 int main(int argc, char **argv)
1866 struct buffer buf = { };
1867 char *kernel_read = NULL, *module_read = NULL;
1868 char *dump_write = NULL;
1872 while ((opt = getopt(argc, argv, "i:I:msSo:aw")) != -1) {
1875 kernel_read = optarg;
1878 module_read = optarg;
1879 external_module = 1;
1885 dump_write = optarg;
1891 vmlinux_section_warnings = 0;
1894 sec_mismatch_verbose = 0;
1897 warn_unresolved = 1;
1905 read_dump(kernel_read, 1);
1907 read_dump(module_read, 0);
1909 while (optind < argc)
1910 read_symbols(argv[optind++]);
1912 for (mod = modules; mod; mod = mod->next) {
1920 for (mod = modules; mod; mod = mod->next) {
1921 char fname[strlen(mod->name) + 10];
1928 add_header(&buf, mod);
1929 err |= add_versions(&buf, mod);
1930 add_depends(&buf, mod, modules);
1931 add_moddevtable(&buf, mod);
1932 add_srcversion(&buf, mod);
1934 sprintf(fname, "%s.mod.c", mod->name);
1935 write_if_changed(&buf, fname);
1939 write_dump(dump_write);
1940 if (sec_mismatch_count && !sec_mismatch_verbose)
1941 fprintf(stderr, "modpost: Found %d section mismatch(es).\n"
1942 "To see full details build your kernel with:\n"
1943 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
1944 sec_mismatch_count);