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 ...
22 #include "../../include/linux/license.h"
24 /* Are we using CONFIG_MODVERSIONS? */
25 static int modversions = 0;
26 /* Warn about undefined symbols? (do so if we have vmlinux) */
27 static int have_vmlinux = 0;
28 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
29 static int all_versions = 0;
30 /* If we are modposting external module set to 1 */
31 static int external_module = 0;
32 /* Warn about section mismatch in vmlinux if set to 1 */
33 static int vmlinux_section_warnings = 1;
34 /* Only warn about unresolved symbols */
35 static int warn_unresolved = 0;
36 /* How a symbol is exported */
37 static int sec_mismatch_count = 0;
38 static int sec_mismatch_fatal = 0;
39 /* ignore missing files */
40 static int ignore_missing_files;
41 /* write namespace dependencies */
42 static int write_namespace_deps;
45 export_plain, export_unused, export_gpl,
46 export_unused_gpl, export_gpl_future, export_unknown
49 /* In kernel, this size is defined in linux/module.h;
50 * here we use Elf_Addr instead of long for covering cross-compile
53 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
55 #define PRINTF __attribute__ ((format (printf, 1, 2)))
57 PRINTF void fatal(const char *fmt, ...)
61 fprintf(stderr, "FATAL: ");
63 va_start(arglist, fmt);
64 vfprintf(stderr, fmt, arglist);
70 PRINTF void warn(const char *fmt, ...)
74 fprintf(stderr, "WARNING: ");
76 va_start(arglist, fmt);
77 vfprintf(stderr, fmt, arglist);
81 PRINTF void merror(const char *fmt, ...)
85 fprintf(stderr, "ERROR: ");
87 va_start(arglist, fmt);
88 vfprintf(stderr, fmt, arglist);
92 static inline bool strends(const char *str, const char *postfix)
94 if (strlen(str) < strlen(postfix))
97 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
100 static int is_vmlinux(const char *modname)
104 myname = strrchr(modname, '/');
110 return (strcmp(myname, "vmlinux") == 0) ||
111 (strcmp(myname, "vmlinux.o") == 0);
114 void *do_nofail(void *ptr, const char *expr)
117 fatal("modpost: Memory allocation failure: %s.\n", expr);
122 /* A list of all modules we processed */
123 static struct module *modules;
125 static struct module *find_module(const char *modname)
129 for (mod = modules; mod; mod = mod->next)
130 if (strcmp(mod->name, modname) == 0)
135 static struct module *new_module(const char *modname)
140 mod = NOFAIL(malloc(sizeof(*mod)));
141 memset(mod, 0, sizeof(*mod));
142 p = NOFAIL(strdup(modname));
144 /* strip trailing .o */
145 if (strends(p, ".o")) {
146 p[strlen(p) - 2] = '\0';
152 mod->gpl_compatible = -1;
159 /* A hash of all exported symbols,
160 * struct symbol is also used for lists of unresolved symbols */
162 #define SYMBOL_HASH_SIZE 1024
166 struct module *module;
169 const char *namespace;
171 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
172 unsigned int kernel:1; /* 1 if symbol is from kernel
173 * (only for external modules) **/
174 unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */
175 unsigned int is_static:1; /* 1 if symbol is not global */
176 enum export export; /* Type of export */
180 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
182 /* This is based on the hash agorithm from gdbm, via tdb */
183 static inline unsigned int tdb_hash(const char *name)
185 unsigned value; /* Used to compute the hash value. */
186 unsigned i; /* Used to cycle through random values. */
188 /* Set the initial value from the key size. */
189 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
190 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
192 return (1103515243 * value + 12345);
196 * Allocate a new symbols for use in the hash of exported symbols or
197 * the list of unresolved symbols per module
199 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
202 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
204 memset(s, 0, sizeof(*s));
205 strcpy(s->name, name);
212 /* For the hash of exported symbols */
213 static struct symbol *new_symbol(const char *name, struct module *module,
219 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
220 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
221 new->module = module;
222 new->export = export;
226 static struct symbol *find_symbol(const char *name)
230 /* For our purposes, .foo matches foo. PPC64 needs this. */
234 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
235 if (strcmp(s->name, name) == 0)
241 static bool contains_namespace(struct namespace_list *list,
242 const char *namespace)
244 struct namespace_list *ns_entry;
246 for (ns_entry = list; ns_entry != NULL; ns_entry = ns_entry->next)
247 if (strcmp(ns_entry->namespace, namespace) == 0)
253 static void add_namespace(struct namespace_list **list, const char *namespace)
255 struct namespace_list *ns_entry;
257 if (!contains_namespace(*list, namespace)) {
258 ns_entry = NOFAIL(malloc(sizeof(struct namespace_list) +
259 strlen(namespace) + 1));
260 strcpy(ns_entry->namespace, namespace);
261 ns_entry->next = *list;
266 static bool module_imports_namespace(struct module *module,
267 const char *namespace)
269 return contains_namespace(module->imported_namespaces, namespace);
272 static const struct {
276 { .str = "EXPORT_SYMBOL", .export = export_plain },
277 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
278 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
279 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
280 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
281 { .str = "(unknown)", .export = export_unknown },
285 static const char *export_str(enum export ex)
287 return export_list[ex].str;
290 static enum export export_no(const char *s)
295 return export_unknown;
296 for (i = 0; export_list[i].export != export_unknown; i++) {
297 if (strcmp(export_list[i].str, s) == 0)
298 return export_list[i].export;
300 return export_unknown;
303 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
305 return (void *)elf->hdr +
306 elf->sechdrs[elf->secindex_strings].sh_offset +
310 static const char *sec_name(struct elf_info *elf, int secindex)
312 return sech_name(elf, &elf->sechdrs[secindex]);
315 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
317 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
319 const char *secname = sec_name(elf, sec);
321 if (strstarts(secname, "___ksymtab+"))
323 else if (strstarts(secname, "___ksymtab_unused+"))
324 return export_unused;
325 else if (strstarts(secname, "___ksymtab_gpl+"))
327 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
328 return export_unused_gpl;
329 else if (strstarts(secname, "___ksymtab_gpl_future+"))
330 return export_gpl_future;
332 return export_unknown;
335 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
337 if (sec == elf->export_sec)
339 else if (sec == elf->export_unused_sec)
340 return export_unused;
341 else if (sec == elf->export_gpl_sec)
343 else if (sec == elf->export_unused_gpl_sec)
344 return export_unused_gpl;
345 else if (sec == elf->export_gpl_future_sec)
346 return export_gpl_future;
348 return export_unknown;
351 static const char *sym_extract_namespace(const char **symname)
356 n = strcspn(*symname, ".");
357 if (n < strlen(*symname) - 1) {
358 dupsymname = NOFAIL(strdup(*symname));
359 dupsymname[n] = '\0';
360 *symname = dupsymname;
361 return dupsymname + n + 1;
368 * Add an exported symbol - it may have already been added without a
369 * CRC, in this case just update the CRC
371 static struct symbol *sym_add_exported(const char *name, const char *namespace,
372 struct module *mod, enum export export)
374 struct symbol *s = find_symbol(name);
377 s = new_symbol(name, mod, export);
378 s->namespace = namespace;
381 warn("%s: '%s' exported twice. Previous export was in %s%s\n",
382 mod->name, name, s->module->name,
383 is_vmlinux(s->module->name) ? "" : ".ko");
385 /* In case Module.symvers was out of date */
390 s->vmlinux = is_vmlinux(mod->name);
396 static void sym_update_crc(const char *name, struct module *mod,
397 unsigned int crc, enum export export)
399 struct symbol *s = find_symbol(name);
402 s = new_symbol(name, mod, export);
403 /* Don't complain when we find it later. */
410 void *grab_file(const char *filename, unsigned long *size)
413 void *map = MAP_FAILED;
416 fd = open(filename, O_RDONLY);
423 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
427 if (map == MAP_FAILED)
433 * Return a copy of the next line in a mmap'ed file.
434 * spaces in the beginning of the line is trimmed away.
435 * Return a pointer to a static buffer.
437 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
439 static char line[4096];
442 signed char *p = (signed char *)file + *pos;
445 for (; *pos < size ; (*pos)++) {
446 if (skip && isspace(*p)) {
451 if (*p != '\n' && (*pos < size)) {
455 break; /* Too long, stop */
466 void release_file(void *file, unsigned long size)
471 static int parse_elf(struct elf_info *info, const char *filename)
477 const char *secstrings;
478 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
480 hdr = grab_file(filename, &info->size);
482 if (ignore_missing_files) {
483 fprintf(stderr, "%s: %s (ignored)\n", filename,
491 if (info->size < sizeof(*hdr)) {
492 /* file too small, assume this is an empty .o file */
495 /* Is this a valid ELF file? */
496 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
497 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
498 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
499 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
500 /* Not an ELF file - silently ignore it */
503 /* Fix endianness in ELF header */
504 hdr->e_type = TO_NATIVE(hdr->e_type);
505 hdr->e_machine = TO_NATIVE(hdr->e_machine);
506 hdr->e_version = TO_NATIVE(hdr->e_version);
507 hdr->e_entry = TO_NATIVE(hdr->e_entry);
508 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
509 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
510 hdr->e_flags = TO_NATIVE(hdr->e_flags);
511 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
512 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
513 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
514 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
515 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
516 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
517 sechdrs = (void *)hdr + hdr->e_shoff;
518 info->sechdrs = sechdrs;
520 /* Check if file offset is correct */
521 if (hdr->e_shoff > info->size) {
522 fatal("section header offset=%lu in file '%s' is bigger than "
523 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
524 filename, info->size);
528 if (hdr->e_shnum == SHN_UNDEF) {
530 * There are more than 64k sections,
531 * read count from .sh_size.
533 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
536 info->num_sections = hdr->e_shnum;
538 if (hdr->e_shstrndx == SHN_XINDEX) {
539 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
542 info->secindex_strings = hdr->e_shstrndx;
545 /* Fix endianness in section headers */
546 for (i = 0; i < info->num_sections; i++) {
547 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
548 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
549 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
550 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
551 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
552 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
553 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
554 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
555 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
556 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
558 /* Find symbol table. */
559 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
560 for (i = 1; i < info->num_sections; i++) {
562 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
564 if (!nobits && sechdrs[i].sh_offset > info->size) {
565 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
566 "sizeof(*hrd)=%zu\n", filename,
567 (unsigned long)sechdrs[i].sh_offset,
571 secname = secstrings + sechdrs[i].sh_name;
572 if (strcmp(secname, ".modinfo") == 0) {
574 fatal("%s has NOBITS .modinfo\n", filename);
575 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
576 info->modinfo_len = sechdrs[i].sh_size;
577 } else if (strcmp(secname, "__ksymtab") == 0)
578 info->export_sec = i;
579 else if (strcmp(secname, "__ksymtab_unused") == 0)
580 info->export_unused_sec = i;
581 else if (strcmp(secname, "__ksymtab_gpl") == 0)
582 info->export_gpl_sec = i;
583 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
584 info->export_unused_gpl_sec = i;
585 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
586 info->export_gpl_future_sec = i;
588 if (sechdrs[i].sh_type == SHT_SYMTAB) {
589 unsigned int sh_link_idx;
591 info->symtab_start = (void *)hdr +
592 sechdrs[i].sh_offset;
593 info->symtab_stop = (void *)hdr +
594 sechdrs[i].sh_offset + sechdrs[i].sh_size;
595 sh_link_idx = sechdrs[i].sh_link;
596 info->strtab = (void *)hdr +
597 sechdrs[sh_link_idx].sh_offset;
600 /* 32bit section no. table? ("more than 64k sections") */
601 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
602 symtab_shndx_idx = i;
603 info->symtab_shndx_start = (void *)hdr +
604 sechdrs[i].sh_offset;
605 info->symtab_shndx_stop = (void *)hdr +
606 sechdrs[i].sh_offset + sechdrs[i].sh_size;
609 if (!info->symtab_start)
610 fatal("%s has no symtab?\n", filename);
612 /* Fix endianness in symbols */
613 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
614 sym->st_shndx = TO_NATIVE(sym->st_shndx);
615 sym->st_name = TO_NATIVE(sym->st_name);
616 sym->st_value = TO_NATIVE(sym->st_value);
617 sym->st_size = TO_NATIVE(sym->st_size);
620 if (symtab_shndx_idx != ~0U) {
622 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
623 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
624 filename, sechdrs[symtab_shndx_idx].sh_link,
627 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
635 static void parse_elf_finish(struct elf_info *info)
637 release_file(info->hdr, info->size);
640 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
642 /* ignore __this_module, it will be resolved shortly */
643 if (strcmp(symname, "__this_module") == 0)
645 /* ignore global offset table */
646 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
648 if (info->hdr->e_machine == EM_PPC)
649 /* Special register function linked on all modules during final link of .ko */
650 if (strstarts(symname, "_restgpr_") ||
651 strstarts(symname, "_savegpr_") ||
652 strstarts(symname, "_rest32gpr_") ||
653 strstarts(symname, "_save32gpr_") ||
654 strstarts(symname, "_restvr_") ||
655 strstarts(symname, "_savevr_"))
657 if (info->hdr->e_machine == EM_PPC64)
658 /* Special register function linked on all modules during final link of .ko */
659 if (strstarts(symname, "_restgpr0_") ||
660 strstarts(symname, "_savegpr0_") ||
661 strstarts(symname, "_restvr_") ||
662 strstarts(symname, "_savevr_") ||
663 strcmp(symname, ".TOC.") == 0)
665 /* Do not ignore this symbol */
669 static void handle_modversions(struct module *mod, struct elf_info *info,
670 Elf_Sym *sym, const char *symname)
675 const char *name, *namespace;
677 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
678 strstarts(symname, "__ksymtab"))
679 export = export_from_secname(info, get_secindex(info, sym));
681 export = export_from_sec(info, get_secindex(info, sym));
684 if (strstarts(symname, "__crc_")) {
686 crc = (unsigned int) sym->st_value;
687 if (sym->st_shndx != SHN_UNDEF && sym->st_shndx != SHN_ABS) {
690 /* symbol points to the CRC in the ELF object */
691 crcp = (void *)info->hdr + sym->st_value +
692 info->sechdrs[sym->st_shndx].sh_offset -
693 (info->hdr->e_type != ET_REL ?
694 info->sechdrs[sym->st_shndx].sh_addr : 0);
695 crc = TO_NATIVE(*crcp);
697 sym_update_crc(symname + strlen("__crc_"), mod, crc,
701 switch (sym->st_shndx) {
703 if (strstarts(symname, "__gnu_lto_")) {
704 /* Should warn here, but modpost runs before the linker */
706 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
709 /* undefined symbol */
710 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
711 ELF_ST_BIND(sym->st_info) != STB_WEAK)
713 if (ignore_undef_symbol(info, symname))
715 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
716 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
717 /* add compatibility with older glibc */
718 #ifndef STT_SPARC_REGISTER
719 #define STT_SPARC_REGISTER STT_REGISTER
721 if (info->hdr->e_machine == EM_SPARC ||
722 info->hdr->e_machine == EM_SPARCV9) {
723 /* Ignore register directives. */
724 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
726 if (symname[0] == '.') {
727 char *munged = NOFAIL(strdup(symname));
729 munged[1] = toupper(munged[1]);
736 const char *e = is_vmlinux(mod->name) ?"":".ko";
737 warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
738 symname + strlen("__crc_"), mod->name, e);
740 mod->unres = alloc_symbol(symname,
741 ELF_ST_BIND(sym->st_info) == STB_WEAK,
745 /* All exported symbols */
746 if (strstarts(symname, "__ksymtab_")) {
747 name = symname + strlen("__ksymtab_");
748 namespace = sym_extract_namespace(&name);
749 sym_add_exported(name, namespace, mod, export);
751 if (strcmp(symname, "init_module") == 0)
753 if (strcmp(symname, "cleanup_module") == 0)
754 mod->has_cleanup = 1;
760 * Parse tag=value strings from .modinfo section
762 static char *next_string(char *string, unsigned long *secsize)
764 /* Skip non-zero chars */
767 if ((*secsize)-- <= 1)
771 /* Skip any zero padding. */
774 if ((*secsize)-- <= 1)
780 static char *get_next_modinfo(struct elf_info *info, const char *tag,
784 unsigned int taglen = strlen(tag);
785 char *modinfo = info->modinfo;
786 unsigned long size = info->modinfo_len;
789 size -= prev - modinfo;
790 modinfo = next_string(prev, &size);
793 for (p = modinfo; p; p = next_string(p, &size)) {
794 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
795 return p + taglen + 1;
800 static char *get_modinfo(struct elf_info *info, const char *tag)
803 return get_next_modinfo(info, tag, NULL);
807 * Test if string s ends in string sub
810 static int strrcmp(const char *s, const char *sub)
818 sublen = strlen(sub);
820 if ((slen == 0) || (sublen == 0))
826 return memcmp(s + slen - sublen, sub, sublen);
829 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
832 return elf->strtab + sym->st_name;
837 /* The pattern is an array of simple patterns.
838 * "foo" will match an exact string equal to "foo"
839 * "*foo" will match a string that ends with "foo"
840 * "foo*" will match a string that begins with "foo"
841 * "*foo*" will match a string that contains "foo"
843 static int match(const char *sym, const char * const pat[])
848 const char *endp = p + strlen(p) - 1;
851 if (*p == '*' && *endp == '*') {
852 char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
853 char *here = strstr(sym, bare);
860 else if (*p == '*') {
861 if (strrcmp(sym, p + 1) == 0)
865 else if (*endp == '*') {
866 if (strncmp(sym, p, strlen(p) - 1) == 0)
871 if (strcmp(p, sym) == 0)
879 /* sections that we do not want to do full section mismatch check on */
880 static const char *const section_white_list[] =
884 ".cranges", /* sh64 */
885 ".zdebug*", /* Compressed debug sections. */
886 ".GCC.command.line", /* record-gcc-switches */
887 ".mdebug*", /* alpha, score, mips etc. */
888 ".pdr", /* alpha, score, mips etc. */
893 ".xt.prop", /* xtensa */
894 ".xt.lit", /* xtensa */
895 ".arcextmap*", /* arc */
896 ".gnu.linkonce.arcext*", /* arc : modules */
897 ".cmem*", /* EZchip */
898 ".fmt_slot*", /* EZchip */
905 * This is used to find sections missing the SHF_ALLOC flag.
906 * The cause of this is often a section specified in assembler
907 * without "ax" / "aw".
909 static void check_section(const char *modname, struct elf_info *elf,
912 const char *sec = sech_name(elf, sechdr);
914 if (sechdr->sh_type == SHT_PROGBITS &&
915 !(sechdr->sh_flags & SHF_ALLOC) &&
916 !match(sec, section_white_list)) {
917 warn("%s (%s): unexpected non-allocatable section.\n"
918 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
919 "Note that for example <linux/init.h> contains\n"
920 "section definitions for use in .S files.\n\n",
927 #define ALL_INIT_DATA_SECTIONS \
928 ".init.setup", ".init.rodata", ".meminit.rodata", \
929 ".init.data", ".meminit.data"
930 #define ALL_EXIT_DATA_SECTIONS \
931 ".exit.data", ".memexit.data"
933 #define ALL_INIT_TEXT_SECTIONS \
934 ".init.text", ".meminit.text"
935 #define ALL_EXIT_TEXT_SECTIONS \
936 ".exit.text", ".memexit.text"
938 #define ALL_PCI_INIT_SECTIONS \
939 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
940 ".pci_fixup_enable", ".pci_fixup_resume", \
941 ".pci_fixup_resume_early", ".pci_fixup_suspend"
943 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
944 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
946 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
947 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
949 #define DATA_SECTIONS ".data", ".data.rel"
950 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
951 ".kprobes.text", ".cpuidle.text"
952 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
953 ".fixup", ".entry.text", ".exception.text", ".text.*", \
956 #define INIT_SECTIONS ".init.*"
957 #define MEM_INIT_SECTIONS ".meminit.*"
959 #define EXIT_SECTIONS ".exit.*"
960 #define MEM_EXIT_SECTIONS ".memexit.*"
962 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
963 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
965 /* init data sections */
966 static const char *const init_data_sections[] =
967 { ALL_INIT_DATA_SECTIONS, NULL };
969 /* all init sections */
970 static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
972 /* All init and exit sections (code + data) */
973 static const char *const init_exit_sections[] =
974 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
976 /* all text sections */
977 static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
980 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
983 /* symbols in .data that may refer to init/exit sections */
984 #define DEFAULT_SYMBOL_WHITE_LIST \
986 "*_template", /* scsi uses *_template a lot */ \
987 "*_timer", /* arm uses ops structures named _timer a lot */ \
988 "*_sht", /* scsi also used *_sht to some extent */ \
994 static const char *const head_sections[] = { ".head.text*", NULL };
995 static const char *const linker_symbols[] =
996 { "__init_begin", "_sinittext", "_einittext", NULL };
997 static const char *const optim_symbols[] = { "*.constprop.*", NULL };
1004 XXXINIT_TO_SOME_INIT,
1005 XXXEXIT_TO_SOME_EXIT,
1006 ANY_INIT_TO_ANY_EXIT,
1007 ANY_EXIT_TO_ANY_INIT,
1008 EXPORT_TO_INIT_EXIT,
1009 EXTABLE_TO_NON_TEXT,
1013 * Describe how to match sections on different criterias:
1015 * @fromsec: Array of sections to be matched.
1017 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
1018 * this array is forbidden (black-list). Can be empty.
1020 * @good_tosec: Relocations applied to a section in @fromsec must be
1021 * targetting sections in this array (white-list). Can be empty.
1023 * @mismatch: Type of mismatch.
1025 * @symbol_white_list: Do not match a relocation to a symbol in this list
1026 * even if it is targetting a section in @bad_to_sec.
1028 * @handler: Specific handler to call when a match is found. If NULL,
1029 * default_mismatch_handler() will be called.
1032 struct sectioncheck {
1033 const char *fromsec[20];
1034 const char *bad_tosec[20];
1035 const char *good_tosec[20];
1036 enum mismatch mismatch;
1037 const char *symbol_white_list[20];
1038 void (*handler)(const char *modname, struct elf_info *elf,
1039 const struct sectioncheck* const mismatch,
1040 Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
1044 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1045 const struct sectioncheck* const mismatch,
1046 Elf_Rela *r, Elf_Sym *sym,
1047 const char *fromsec);
1049 static const struct sectioncheck sectioncheck[] = {
1050 /* Do not reference init/exit code/data from
1051 * normal code and data
1054 .fromsec = { TEXT_SECTIONS, NULL },
1055 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1056 .mismatch = TEXT_TO_ANY_INIT,
1057 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1060 .fromsec = { DATA_SECTIONS, NULL },
1061 .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
1062 .mismatch = DATA_TO_ANY_INIT,
1063 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1066 .fromsec = { DATA_SECTIONS, NULL },
1067 .bad_tosec = { INIT_SECTIONS, NULL },
1068 .mismatch = DATA_TO_ANY_INIT,
1069 .symbol_white_list = {
1070 "*_template", "*_timer", "*_sht", "*_ops",
1071 "*_probe", "*_probe_one", "*_console", NULL
1075 .fromsec = { TEXT_SECTIONS, NULL },
1076 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1077 .mismatch = TEXT_TO_ANY_EXIT,
1078 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1081 .fromsec = { DATA_SECTIONS, NULL },
1082 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1083 .mismatch = DATA_TO_ANY_EXIT,
1084 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1086 /* Do not reference init code/data from meminit code/data */
1088 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
1089 .bad_tosec = { INIT_SECTIONS, NULL },
1090 .mismatch = XXXINIT_TO_SOME_INIT,
1091 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1093 /* Do not reference exit code/data from memexit code/data */
1095 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1096 .bad_tosec = { EXIT_SECTIONS, NULL },
1097 .mismatch = XXXEXIT_TO_SOME_EXIT,
1098 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1100 /* Do not use exit code/data from init code */
1102 .fromsec = { ALL_INIT_SECTIONS, NULL },
1103 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1104 .mismatch = ANY_INIT_TO_ANY_EXIT,
1105 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1107 /* Do not use init code/data from exit code */
1109 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1110 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1111 .mismatch = ANY_EXIT_TO_ANY_INIT,
1112 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1115 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1116 .bad_tosec = { INIT_SECTIONS, NULL },
1117 .mismatch = ANY_INIT_TO_ANY_EXIT,
1118 .symbol_white_list = { NULL },
1120 /* Do not export init/exit functions or data */
1122 .fromsec = { "__ksymtab*", NULL },
1123 .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1124 .mismatch = EXPORT_TO_INIT_EXIT,
1125 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1128 .fromsec = { "__ex_table", NULL },
1129 /* If you're adding any new black-listed sections in here, consider
1130 * adding a special 'printer' for them in scripts/check_extable.
1132 .bad_tosec = { ".altinstr_replacement", NULL },
1133 .good_tosec = {ALL_TEXT_SECTIONS , NULL},
1134 .mismatch = EXTABLE_TO_NON_TEXT,
1135 .handler = extable_mismatch_handler,
1139 static const struct sectioncheck *section_mismatch(
1140 const char *fromsec, const char *tosec)
1143 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1144 const struct sectioncheck *check = §ioncheck[0];
1147 * The target section could be the SHT_NUL section when we're
1148 * handling relocations to un-resolved symbols, trying to match it
1149 * doesn't make much sense and causes build failures on parisc
1155 for (i = 0; i < elems; i++) {
1156 if (match(fromsec, check->fromsec)) {
1157 if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
1159 if (check->good_tosec[0] && !match(tosec, check->good_tosec))
1168 * Whitelist to allow certain references to pass with no warning.
1171 * If a module parameter is declared __initdata and permissions=0
1172 * then this is legal despite the warning generated.
1173 * We cannot see value of permissions here, so just ignore
1175 * The pattern is identified by:
1176 * tosec = .init.data
1181 * module_param_call() ops can refer to __init set function if permissions=0
1182 * The pattern is identified by:
1183 * tosec = .init.text
1185 * atsym = __param_ops_*
1188 * Many drivers utilise a *driver container with references to
1189 * add, remove, probe functions etc.
1190 * the pattern is identified by:
1191 * tosec = init or exit section
1192 * fromsec = data section
1193 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1194 * *probe_one, *_console, *_timer
1197 * Whitelist all references from .head.text to any init section
1200 * Some symbols belong to init section but still it is ok to reference
1201 * these from non-init sections as these symbols don't have any memory
1202 * allocated for them and symbol address and value are same. So even
1203 * if init section is freed, its ok to reference those symbols.
1204 * For ex. symbols marking the init section boundaries.
1205 * This pattern is identified by
1206 * refsymname = __init_begin, _sinittext, _einittext
1209 * GCC may optimize static inlines when fed constant arg(s) resulting
1210 * in functions like cpumask_empty() -- generating an associated symbol
1211 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1212 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1213 * meaningless section warning. May need to add isra symbols too...
1214 * This pattern is identified by
1215 * tosec = init section
1216 * fromsec = text section
1217 * refsymname = *.constprop.*
1220 * Hide section mismatch warnings for ELF local symbols. The goal
1221 * is to eliminate false positive modpost warnings caused by
1222 * compiler-generated ELF local symbol names such as ".LANCHOR1".
1223 * Autogenerated symbol names bypass modpost's "Pattern 2"
1224 * whitelisting, which relies on pattern-matching against symbol
1225 * names to work. (One situation where gcc can autogenerate ELF
1226 * local symbols is when "-fsection-anchors" is used.)
1228 static int secref_whitelist(const struct sectioncheck *mismatch,
1229 const char *fromsec, const char *fromsym,
1230 const char *tosec, const char *tosym)
1232 /* Check for pattern 1 */
1233 if (match(tosec, init_data_sections) &&
1234 match(fromsec, data_sections) &&
1235 strstarts(fromsym, "__param"))
1238 /* Check for pattern 1a */
1239 if (strcmp(tosec, ".init.text") == 0 &&
1240 match(fromsec, data_sections) &&
1241 strstarts(fromsym, "__param_ops_"))
1244 /* Check for pattern 2 */
1245 if (match(tosec, init_exit_sections) &&
1246 match(fromsec, data_sections) &&
1247 match(fromsym, mismatch->symbol_white_list))
1250 /* Check for pattern 3 */
1251 if (match(fromsec, head_sections) &&
1252 match(tosec, init_sections))
1255 /* Check for pattern 4 */
1256 if (match(tosym, linker_symbols))
1259 /* Check for pattern 5 */
1260 if (match(fromsec, text_sections) &&
1261 match(tosec, init_sections) &&
1262 match(fromsym, optim_symbols))
1265 /* Check for pattern 6 */
1266 if (strstarts(fromsym, ".L"))
1272 static inline int is_arm_mapping_symbol(const char *str)
1274 return str[0] == '$' && strchr("axtd", str[1])
1275 && (str[2] == '\0' || str[2] == '.');
1279 * If there's no name there, ignore it; likewise, ignore it if it's
1280 * one of the magic symbols emitted used by current ARM tools.
1282 * Otherwise if find_symbols_between() returns those symbols, they'll
1283 * fail the whitelist tests and cause lots of false alarms ... fixable
1284 * only by merging __exit and __init sections into __text, bloating
1285 * the kernel (which is especially evil on embedded platforms).
1287 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1289 const char *name = elf->strtab + sym->st_name;
1291 if (!name || !strlen(name))
1293 return !is_arm_mapping_symbol(name);
1297 * Find symbol based on relocation record info.
1298 * In some cases the symbol supplied is a valid symbol so
1299 * return refsym. If st_name != 0 we assume this is a valid symbol.
1300 * In other cases the symbol needs to be looked up in the symbol table
1301 * based on section and address.
1303 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1307 Elf_Sym *near = NULL;
1308 Elf64_Sword distance = 20;
1310 unsigned int relsym_secindex;
1312 if (relsym->st_name != 0)
1315 relsym_secindex = get_secindex(elf, relsym);
1316 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1317 if (get_secindex(elf, sym) != relsym_secindex)
1319 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1321 if (!is_valid_name(elf, sym))
1323 if (sym->st_value == addr)
1325 /* Find a symbol nearby - addr are maybe negative */
1326 d = sym->st_value - addr;
1328 d = addr - sym->st_value;
1334 /* We need a close match */
1342 * Find symbols before or equal addr and after addr - in the section sec.
1343 * If we find two symbols with equal offset prefer one with a valid name.
1344 * The ELF format may have a better way to detect what type of symbol
1345 * it is, but this works for now.
1347 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1351 Elf_Sym *near = NULL;
1352 Elf_Addr distance = ~0;
1354 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1357 if (is_shndx_special(sym->st_shndx))
1359 symsec = sec_name(elf, get_secindex(elf, sym));
1360 if (strcmp(symsec, sec) != 0)
1362 if (!is_valid_name(elf, sym))
1364 if (sym->st_value <= addr) {
1365 if ((addr - sym->st_value) < distance) {
1366 distance = addr - sym->st_value;
1368 } else if ((addr - sym->st_value) == distance) {
1377 * Convert a section name to the function/data attribute
1378 * .init.text => __init
1379 * .memexitconst => __memconst
1382 * The memory of returned value has been allocated on a heap. The user of this
1383 * method should free it after usage.
1385 static char *sec2annotation(const char *s)
1387 if (match(s, init_exit_sections)) {
1388 char *p = NOFAIL(malloc(20));
1395 while (*s && *s != '.')
1400 if (strstr(s, "rodata") != NULL)
1401 strcat(p, "const ");
1402 else if (strstr(s, "data") != NULL)
1408 return NOFAIL(strdup(""));
1412 static int is_function(Elf_Sym *sym)
1415 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1420 static void print_section_list(const char * const list[20])
1422 const char *const *s = list;
1425 fprintf(stderr, "%s", *s);
1428 fprintf(stderr, ", ");
1430 fprintf(stderr, "\n");
1433 static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
1436 case 0: *name = "variable"; *name_p = ""; break;
1437 case 1: *name = "function"; *name_p = "()"; break;
1438 default: *name = "(unknown reference)"; *name_p = ""; break;
1443 * Print a warning about a section mismatch.
1444 * Try to find symbols near it so user can find it.
1445 * Check whitelist before warning - it may be a false positive.
1447 static void report_sec_mismatch(const char *modname,
1448 const struct sectioncheck *mismatch,
1449 const char *fromsec,
1450 unsigned long long fromaddr,
1451 const char *fromsym,
1453 const char *tosec, const char *tosym,
1456 const char *from, *from_p;
1457 const char *to, *to_p;
1461 sec_mismatch_count++;
1463 get_pretty_name(from_is_func, &from, &from_p);
1464 get_pretty_name(to_is_func, &to, &to_p);
1466 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1467 "to the %s %s:%s%s\n",
1468 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1471 switch (mismatch->mismatch) {
1472 case TEXT_TO_ANY_INIT:
1473 prl_from = sec2annotation(fromsec);
1474 prl_to = sec2annotation(tosec);
1476 "The function %s%s() references\n"
1478 "This is often because %s lacks a %s\n"
1479 "annotation or the annotation of %s is wrong.\n",
1481 to, prl_to, tosym, to_p,
1482 fromsym, prl_to, tosym);
1486 case DATA_TO_ANY_INIT: {
1487 prl_to = sec2annotation(tosec);
1489 "The variable %s references\n"
1491 "If the reference is valid then annotate the\n"
1492 "variable with __init* or __refdata (see linux/init.h) "
1493 "or name the variable:\n",
1494 fromsym, to, prl_to, tosym, to_p);
1495 print_section_list(mismatch->symbol_white_list);
1499 case TEXT_TO_ANY_EXIT:
1500 prl_to = sec2annotation(tosec);
1502 "The function %s() references a %s in an exit section.\n"
1503 "Often the %s %s%s has valid usage outside the exit section\n"
1504 "and the fix is to remove the %sannotation of %s.\n",
1505 fromsym, to, to, tosym, to_p, prl_to, tosym);
1508 case DATA_TO_ANY_EXIT: {
1509 prl_to = sec2annotation(tosec);
1511 "The variable %s references\n"
1513 "If the reference is valid then annotate the\n"
1514 "variable with __exit* (see linux/init.h) or "
1515 "name the variable:\n",
1516 fromsym, to, prl_to, tosym, to_p);
1517 print_section_list(mismatch->symbol_white_list);
1521 case XXXINIT_TO_SOME_INIT:
1522 case XXXEXIT_TO_SOME_EXIT:
1523 prl_from = sec2annotation(fromsec);
1524 prl_to = sec2annotation(tosec);
1526 "The %s %s%s%s references\n"
1528 "If %s is only used by %s then\n"
1529 "annotate %s with a matching annotation.\n",
1530 from, prl_from, fromsym, from_p,
1531 to, prl_to, tosym, to_p,
1532 tosym, fromsym, tosym);
1536 case ANY_INIT_TO_ANY_EXIT:
1537 prl_from = sec2annotation(fromsec);
1538 prl_to = sec2annotation(tosec);
1540 "The %s %s%s%s references\n"
1542 "This is often seen when error handling "
1543 "in the init function\n"
1544 "uses functionality in the exit path.\n"
1545 "The fix is often to remove the %sannotation of\n"
1546 "%s%s so it may be used outside an exit section.\n",
1547 from, prl_from, fromsym, from_p,
1548 to, prl_to, tosym, to_p,
1549 prl_to, tosym, to_p);
1553 case ANY_EXIT_TO_ANY_INIT:
1554 prl_from = sec2annotation(fromsec);
1555 prl_to = sec2annotation(tosec);
1557 "The %s %s%s%s references\n"
1559 "This is often seen when error handling "
1560 "in the exit function\n"
1561 "uses functionality in the init path.\n"
1562 "The fix is often to remove the %sannotation of\n"
1563 "%s%s so it may be used outside an init section.\n",
1564 from, prl_from, fromsym, from_p,
1565 to, prl_to, tosym, to_p,
1566 prl_to, tosym, to_p);
1570 case EXPORT_TO_INIT_EXIT:
1571 prl_to = sec2annotation(tosec);
1573 "The symbol %s is exported and annotated %s\n"
1574 "Fix this by removing the %sannotation of %s "
1575 "or drop the export.\n",
1576 tosym, prl_to, prl_to, tosym);
1579 case EXTABLE_TO_NON_TEXT:
1580 fatal("There's a special handler for this mismatch type, "
1581 "we should never get here.");
1584 fprintf(stderr, "\n");
1587 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
1588 const struct sectioncheck* const mismatch,
1589 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1595 const char *fromsym;
1597 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1598 fromsym = sym_name(elf, from);
1600 if (strstarts(fromsym, "reference___initcall"))
1603 tosec = sec_name(elf, get_secindex(elf, sym));
1604 to = find_elf_symbol(elf, r->r_addend, sym);
1605 tosym = sym_name(elf, to);
1607 /* check whitelist - we may ignore it */
1608 if (secref_whitelist(mismatch,
1609 fromsec, fromsym, tosec, tosym)) {
1610 report_sec_mismatch(modname, mismatch,
1611 fromsec, r->r_offset, fromsym,
1612 is_function(from), tosec, tosym,
1617 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
1619 if (section_index > elf->num_sections)
1620 fatal("section_index is outside elf->num_sections!\n");
1622 return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
1626 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1627 * to know the sizeof(struct exception_table_entry) for the target architecture.
1629 static unsigned int extable_entry_size = 0;
1630 static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
1633 * If we're currently checking the second relocation within __ex_table,
1634 * that relocation offset tells us the offsetof(struct
1635 * exception_table_entry, fixup) which is equal to sizeof(struct
1636 * exception_table_entry) divided by two. We use that to our advantage
1637 * since there's no portable way to get that size as every architecture
1638 * seems to go with different sized types. Not pretty but better than
1639 * hard-coding the size for every architecture..
1641 if (!extable_entry_size)
1642 extable_entry_size = r->r_offset * 2;
1645 static inline bool is_extable_fault_address(Elf_Rela *r)
1648 * extable_entry_size is only discovered after we've handled the
1649 * _second_ relocation in __ex_table, so only abort when we're not
1650 * handling the first reloc and extable_entry_size is zero.
1652 if (r->r_offset && extable_entry_size == 0)
1653 fatal("extable_entry size hasn't been discovered!\n");
1655 return ((r->r_offset == 0) ||
1656 (r->r_offset % extable_entry_size == 0));
1659 #define is_second_extable_reloc(Start, Cur, Sec) \
1660 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1662 static void report_extable_warnings(const char* modname, struct elf_info* elf,
1663 const struct sectioncheck* const mismatch,
1664 Elf_Rela* r, Elf_Sym* sym,
1665 const char* fromsec, const char* tosec)
1667 Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
1668 const char* fromsym_name = sym_name(elf, fromsym);
1669 Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
1670 const char* tosym_name = sym_name(elf, tosym);
1671 const char* from_pretty_name;
1672 const char* from_pretty_name_p;
1673 const char* to_pretty_name;
1674 const char* to_pretty_name_p;
1676 get_pretty_name(is_function(fromsym),
1677 &from_pretty_name, &from_pretty_name_p);
1678 get_pretty_name(is_function(tosym),
1679 &to_pretty_name, &to_pretty_name_p);
1681 warn("%s(%s+0x%lx): Section mismatch in reference"
1682 " from the %s %s%s to the %s %s:%s%s\n",
1683 modname, fromsec, (long)r->r_offset, from_pretty_name,
1684 fromsym_name, from_pretty_name_p,
1685 to_pretty_name, tosec, tosym_name, to_pretty_name_p);
1687 if (!match(tosec, mismatch->bad_tosec) &&
1688 is_executable_section(elf, get_secindex(elf, sym)))
1690 "The relocation at %s+0x%lx references\n"
1691 "section \"%s\" which is not in the list of\n"
1692 "authorized sections. If you're adding a new section\n"
1693 "and/or if this reference is valid, add \"%s\" to the\n"
1694 "list of authorized sections to jump to on fault.\n"
1695 "This can be achieved by adding \"%s\" to \n"
1696 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1697 fromsec, (long)r->r_offset, tosec, tosec, tosec);
1700 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
1701 const struct sectioncheck* const mismatch,
1702 Elf_Rela* r, Elf_Sym* sym,
1703 const char *fromsec)
1705 const char* tosec = sec_name(elf, get_secindex(elf, sym));
1707 sec_mismatch_count++;
1709 report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
1711 if (match(tosec, mismatch->bad_tosec))
1712 fatal("The relocation at %s+0x%lx references\n"
1713 "section \"%s\" which is black-listed.\n"
1714 "Something is seriously wrong and should be fixed.\n"
1715 "You might get more information about where this is\n"
1716 "coming from by using scripts/check_extable.sh %s\n",
1717 fromsec, (long)r->r_offset, tosec, modname);
1718 else if (!is_executable_section(elf, get_secindex(elf, sym))) {
1719 if (is_extable_fault_address(r))
1720 fatal("The relocation at %s+0x%lx references\n"
1721 "section \"%s\" which is not executable, IOW\n"
1722 "it is not possible for the kernel to fault\n"
1723 "at that address. Something is seriously wrong\n"
1724 "and should be fixed.\n",
1725 fromsec, (long)r->r_offset, tosec);
1727 fatal("The relocation at %s+0x%lx references\n"
1728 "section \"%s\" which is not executable, IOW\n"
1729 "the kernel will fault if it ever tries to\n"
1730 "jump to it. Something is seriously wrong\n"
1731 "and should be fixed.\n",
1732 fromsec, (long)r->r_offset, tosec);
1736 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1737 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1739 const char *tosec = sec_name(elf, get_secindex(elf, sym));
1740 const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
1743 if (mismatch->handler)
1744 mismatch->handler(modname, elf, mismatch,
1747 default_mismatch_handler(modname, elf, mismatch,
1752 static unsigned int *reloc_location(struct elf_info *elf,
1753 Elf_Shdr *sechdr, Elf_Rela *r)
1755 Elf_Shdr *sechdrs = elf->sechdrs;
1756 int section = sechdr->sh_info;
1758 return (void *)elf->hdr + sechdrs[section].sh_offset +
1762 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1764 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1765 unsigned int *location = reloc_location(elf, sechdr, r);
1769 r->r_addend = TO_NATIVE(*location);
1772 r->r_addend = TO_NATIVE(*location) + 4;
1773 /* For CONFIG_RELOCATABLE=y */
1774 if (elf->hdr->e_type == ET_EXEC)
1775 r->r_addend += r->r_offset;
1782 #define R_ARM_CALL 28
1784 #ifndef R_ARM_JUMP24
1785 #define R_ARM_JUMP24 29
1788 #ifndef R_ARM_THM_CALL
1789 #define R_ARM_THM_CALL 10
1791 #ifndef R_ARM_THM_JUMP24
1792 #define R_ARM_THM_JUMP24 30
1794 #ifndef R_ARM_THM_JUMP19
1795 #define R_ARM_THM_JUMP19 51
1798 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1800 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1804 /* From ARM ABI: (S + A) | T */
1805 r->r_addend = (int)(long)
1806 (elf->symtab_start + ELF_R_SYM(r->r_info));
1811 case R_ARM_THM_CALL:
1812 case R_ARM_THM_JUMP24:
1813 case R_ARM_THM_JUMP19:
1814 /* From ARM ABI: ((S + A) | T) - P */
1815 r->r_addend = (int)(long)(elf->hdr +
1817 (r->r_offset - sechdr->sh_addr));
1825 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1827 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1828 unsigned int *location = reloc_location(elf, sechdr, r);
1831 if (r_typ == R_MIPS_HI16)
1832 return 1; /* skip this */
1833 inst = TO_NATIVE(*location);
1836 r->r_addend = inst & 0xffff;
1839 r->r_addend = (inst & 0x03ffffff) << 2;
1848 static void section_rela(const char *modname, struct elf_info *elf,
1855 const char *fromsec;
1857 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1858 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1860 fromsec = sech_name(elf, sechdr);
1861 fromsec += strlen(".rela");
1862 /* if from section (name) is know good then skip it */
1863 if (match(fromsec, section_white_list))
1866 for (rela = start; rela < stop; rela++) {
1867 r.r_offset = TO_NATIVE(rela->r_offset);
1868 #if KERNEL_ELFCLASS == ELFCLASS64
1869 if (elf->hdr->e_machine == EM_MIPS) {
1871 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1872 r_sym = TO_NATIVE(r_sym);
1873 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1874 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1876 r.r_info = TO_NATIVE(rela->r_info);
1877 r_sym = ELF_R_SYM(r.r_info);
1880 r.r_info = TO_NATIVE(rela->r_info);
1881 r_sym = ELF_R_SYM(r.r_info);
1883 r.r_addend = TO_NATIVE(rela->r_addend);
1884 sym = elf->symtab_start + r_sym;
1885 /* Skip special sections */
1886 if (is_shndx_special(sym->st_shndx))
1888 if (is_second_extable_reloc(start, rela, fromsec))
1889 find_extable_entry_size(fromsec, &r);
1890 check_section_mismatch(modname, elf, &r, sym, fromsec);
1894 static void section_rel(const char *modname, struct elf_info *elf,
1901 const char *fromsec;
1903 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1904 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1906 fromsec = sech_name(elf, sechdr);
1907 fromsec += strlen(".rel");
1908 /* if from section (name) is know good then skip it */
1909 if (match(fromsec, section_white_list))
1912 for (rel = start; rel < stop; rel++) {
1913 r.r_offset = TO_NATIVE(rel->r_offset);
1914 #if KERNEL_ELFCLASS == ELFCLASS64
1915 if (elf->hdr->e_machine == EM_MIPS) {
1917 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1918 r_sym = TO_NATIVE(r_sym);
1919 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1920 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1922 r.r_info = TO_NATIVE(rel->r_info);
1923 r_sym = ELF_R_SYM(r.r_info);
1926 r.r_info = TO_NATIVE(rel->r_info);
1927 r_sym = ELF_R_SYM(r.r_info);
1930 switch (elf->hdr->e_machine) {
1932 if (addend_386_rel(elf, sechdr, &r))
1936 if (addend_arm_rel(elf, sechdr, &r))
1940 if (addend_mips_rel(elf, sechdr, &r))
1944 sym = elf->symtab_start + r_sym;
1945 /* Skip special sections */
1946 if (is_shndx_special(sym->st_shndx))
1948 if (is_second_extable_reloc(start, rel, fromsec))
1949 find_extable_entry_size(fromsec, &r);
1950 check_section_mismatch(modname, elf, &r, sym, fromsec);
1955 * A module includes a number of sections that are discarded
1956 * either when loaded or when used as built-in.
1957 * For loaded modules all functions marked __init and all data
1958 * marked __initdata will be discarded when the module has been initialized.
1959 * Likewise for modules used built-in the sections marked __exit
1960 * are discarded because __exit marked function are supposed to be called
1961 * only when a module is unloaded which never happens for built-in modules.
1962 * The check_sec_ref() function traverses all relocation records
1963 * to find all references to a section that reference a section that will
1964 * be discarded and warns about it.
1966 static void check_sec_ref(struct module *mod, const char *modname,
1967 struct elf_info *elf)
1970 Elf_Shdr *sechdrs = elf->sechdrs;
1972 /* Walk through all sections */
1973 for (i = 0; i < elf->num_sections; i++) {
1974 check_section(modname, elf, &elf->sechdrs[i]);
1975 /* We want to process only relocation sections and not .init */
1976 if (sechdrs[i].sh_type == SHT_RELA)
1977 section_rela(modname, elf, &elf->sechdrs[i]);
1978 else if (sechdrs[i].sh_type == SHT_REL)
1979 section_rel(modname, elf, &elf->sechdrs[i]);
1983 static char *remove_dot(char *s)
1985 size_t n = strcspn(s, ".");
1988 size_t m = strspn(s + n + 1, "0123456789");
1989 if (m && (s[n + m] == '.' || s[n + m] == 0))
1995 static void read_symbols(const char *modname)
1997 const char *symname;
2002 struct elf_info info = { };
2005 if (!parse_elf(&info, modname))
2008 mod = new_module(modname);
2010 /* When there's no vmlinux, don't print warnings about
2011 * unresolved symbols (since there'll be too many ;) */
2012 if (is_vmlinux(modname)) {
2017 license = get_modinfo(&info, "license");
2018 if (!license && !is_vmlinux(modname))
2019 warn("modpost: missing MODULE_LICENSE() in %s\n"
2020 "see include/linux/module.h for "
2021 "more information\n", modname);
2023 if (license_is_gpl_compatible(license))
2024 mod->gpl_compatible = 1;
2026 mod->gpl_compatible = 0;
2029 license = get_next_modinfo(&info, "license", license);
2032 namespace = get_modinfo(&info, "import_ns");
2034 add_namespace(&mod->imported_namespaces, namespace);
2035 namespace = get_next_modinfo(&info, "import_ns", namespace);
2038 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2039 symname = remove_dot(info.strtab + sym->st_name);
2041 handle_modversions(mod, &info, sym, symname);
2042 handle_moddevtable(mod, &info, sym, symname);
2045 // check for static EXPORT_SYMBOL_* functions && global vars
2046 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2047 unsigned char bind = ELF_ST_BIND(sym->st_info);
2049 if (bind == STB_GLOBAL || bind == STB_WEAK) {
2051 find_symbol(remove_dot(info.strtab +
2059 if (!is_vmlinux(modname) || vmlinux_section_warnings)
2060 check_sec_ref(mod, modname, &info);
2062 version = get_modinfo(&info, "version");
2064 maybe_frob_rcs_version(modname, version, info.modinfo,
2065 version - (char *)info.hdr);
2066 if (version || (all_versions && !is_vmlinux(modname)))
2067 get_src_version(modname, mod->srcversion,
2068 sizeof(mod->srcversion)-1);
2070 parse_elf_finish(&info);
2072 /* Our trick to get versioning for module struct etc. - it's
2073 * never passed as an argument to an exported function, so
2074 * the automatic versioning doesn't pick it up, but it's really
2075 * important anyhow */
2077 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
2080 static void read_symbols_from_files(const char *filename)
2083 char fname[PATH_MAX];
2085 if (strcmp(filename, "-") != 0) {
2086 in = fopen(filename, "r");
2088 fatal("Can't open filenames file %s: %m", filename);
2091 while (fgets(fname, PATH_MAX, in) != NULL) {
2092 if (strends(fname, "\n"))
2093 fname[strlen(fname)-1] = '\0';
2094 read_symbols(fname);
2103 /* We first write the generated file into memory using the
2104 * following helper, then compare to the file on disk and
2105 * only update the later if anything changed */
2107 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
2108 const char *fmt, ...)
2115 len = vsnprintf(tmp, SZ, fmt, ap);
2116 buf_write(buf, tmp, len);
2120 void buf_write(struct buffer *buf, const char *s, int len)
2122 if (buf->size - buf->pos < len) {
2123 buf->size += len + SZ;
2124 buf->p = NOFAIL(realloc(buf->p, buf->size));
2126 strncpy(buf->p + buf->pos, s, len);
2130 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
2132 const char *e = is_vmlinux(m) ?"":".ko";
2136 fatal("modpost: GPL-incompatible module %s%s "
2137 "uses GPL-only symbol '%s'\n", m, e, s);
2139 case export_unused_gpl:
2140 fatal("modpost: GPL-incompatible module %s%s "
2141 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
2143 case export_gpl_future:
2144 warn("modpost: GPL-incompatible module %s%s "
2145 "uses future GPL-only symbol '%s'\n", m, e, s);
2149 case export_unknown:
2155 static void check_for_unused(enum export exp, const char *m, const char *s)
2157 const char *e = is_vmlinux(m) ?"":".ko";
2161 case export_unused_gpl:
2162 warn("modpost: module %s%s "
2163 "uses symbol '%s' marked UNUSED\n", m, e, s);
2171 static int check_exports(struct module *mod)
2173 struct symbol *s, *exp;
2176 for (s = mod->unres; s; s = s->next) {
2177 const char *basename;
2178 exp = find_symbol(s->name);
2179 if (!exp || exp->module == mod) {
2180 if (have_vmlinux && !s->weak) {
2181 if (warn_unresolved) {
2182 warn("\"%s\" [%s.ko] undefined!\n",
2183 s->name, mod->name);
2185 merror("\"%s\" [%s.ko] undefined!\n",
2186 s->name, mod->name);
2192 basename = strrchr(mod->name, '/');
2196 basename = mod->name;
2198 if (exp->namespace) {
2199 add_namespace(&mod->required_namespaces,
2202 if (!write_namespace_deps &&
2203 !module_imports_namespace(mod, exp->namespace)) {
2204 warn("module %s uses symbol %s from namespace %s, but does not import it.\n",
2205 basename, exp->name, exp->namespace);
2209 if (!mod->gpl_compatible)
2210 check_for_gpl_usage(exp->export, basename, exp->name);
2211 check_for_unused(exp->export, basename, exp->name);
2217 static int check_modname_len(struct module *mod)
2219 const char *mod_name;
2221 mod_name = strrchr(mod->name, '/');
2222 if (mod_name == NULL)
2223 mod_name = mod->name;
2226 if (strlen(mod_name) >= MODULE_NAME_LEN) {
2227 merror("module name is too long [%s.ko]\n", mod->name);
2235 * Header for the generated file
2237 static void add_header(struct buffer *b, struct module *mod)
2239 buf_printf(b, "#include <linux/build-salt.h>\n");
2240 buf_printf(b, "#include <linux/module.h>\n");
2241 buf_printf(b, "#include <linux/vermagic.h>\n");
2242 buf_printf(b, "#include <linux/compiler.h>\n");
2243 buf_printf(b, "\n");
2244 buf_printf(b, "BUILD_SALT;\n");
2245 buf_printf(b, "\n");
2246 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2247 buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
2248 buf_printf(b, "\n");
2249 buf_printf(b, "__visible struct module __this_module\n");
2250 buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n");
2251 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
2253 buf_printf(b, "\t.init = init_module,\n");
2254 if (mod->has_cleanup)
2255 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
2256 "\t.exit = cleanup_module,\n"
2258 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
2259 buf_printf(b, "};\n");
2262 static void add_intree_flag(struct buffer *b, int is_intree)
2265 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
2268 /* Cannot check for assembler */
2269 static void add_retpoline(struct buffer *b)
2271 buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
2272 buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
2273 buf_printf(b, "#endif\n");
2276 static void add_staging_flag(struct buffer *b, const char *name)
2278 if (strstarts(name, "drivers/staging"))
2279 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
2283 * Record CRCs for unresolved symbols
2285 static int add_versions(struct buffer *b, struct module *mod)
2287 struct symbol *s, *exp;
2290 for (s = mod->unres; s; s = s->next) {
2291 exp = find_symbol(s->name);
2292 if (!exp || exp->module == mod)
2294 s->module = exp->module;
2295 s->crc_valid = exp->crc_valid;
2302 buf_printf(b, "\n");
2303 buf_printf(b, "static const struct modversion_info ____versions[]\n");
2304 buf_printf(b, "__used __section(__versions) = {\n");
2306 for (s = mod->unres; s; s = s->next) {
2309 if (!s->crc_valid) {
2310 warn("\"%s\" [%s.ko] has no CRC!\n",
2311 s->name, mod->name);
2314 if (strlen(s->name) >= MODULE_NAME_LEN) {
2315 merror("too long symbol \"%s\" [%s.ko]\n",
2316 s->name, mod->name);
2320 buf_printf(b, "\t{ %#8x, \"%s\" },\n",
2324 buf_printf(b, "};\n");
2329 static void add_depends(struct buffer *b, struct module *mod)
2334 /* Clear ->seen flag of modules that own symbols needed by this. */
2335 for (s = mod->unres; s; s = s->next)
2337 s->module->seen = is_vmlinux(s->module->name);
2339 buf_printf(b, "\n");
2340 buf_printf(b, "MODULE_INFO(depends, \"");
2341 for (s = mod->unres; s; s = s->next) {
2346 if (s->module->seen)
2349 s->module->seen = 1;
2350 p = strrchr(s->module->name, '/');
2354 p = s->module->name;
2355 buf_printf(b, "%s%s", first ? "" : ",", p);
2358 buf_printf(b, "\");\n");
2361 static void add_srcversion(struct buffer *b, struct module *mod)
2363 if (mod->srcversion[0]) {
2364 buf_printf(b, "\n");
2365 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
2370 static void write_if_changed(struct buffer *b, const char *fname)
2376 file = fopen(fname, "r");
2380 if (fstat(fileno(file), &st) < 0)
2383 if (st.st_size != b->pos)
2386 tmp = NOFAIL(malloc(b->pos));
2387 if (fread(tmp, 1, b->pos, file) != b->pos)
2390 if (memcmp(tmp, b->p, b->pos) != 0)
2402 file = fopen(fname, "w");
2407 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2414 /* parse Module.symvers file. line format:
2415 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2417 static void read_dump(const char *fname, unsigned int kernel)
2419 unsigned long size, pos = 0;
2420 void *file = grab_file(fname, &size);
2424 /* No symbol versions, silently ignore */
2427 while ((line = get_next_line(&pos, file, size))) {
2428 char *symname, *namespace, *modname, *d, *export, *end;
2433 if (!(symname = strchr(line, '\t')))
2436 if (!(namespace = strchr(symname, '\t')))
2438 *namespace++ = '\0';
2439 if (!(modname = strchr(namespace, '\t')))
2442 if ((export = strchr(modname, '\t')) != NULL)
2444 if (export && ((end = strchr(export, '\t')) != NULL))
2446 crc = strtoul(line, &d, 16);
2447 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2449 mod = find_module(modname);
2451 if (is_vmlinux(modname))
2453 mod = new_module(modname);
2456 s = sym_add_exported(symname, namespace, mod,
2461 sym_update_crc(symname, mod, crc, export_no(export));
2463 release_file(file, size);
2466 release_file(file, size);
2467 fatal("parse error in symbol dump file\n");
2470 /* For normal builds always dump all symbols.
2471 * For external modules only dump symbols
2472 * that are not read from kernel Module.symvers.
2474 static int dump_sym(struct symbol *sym)
2476 if (!external_module)
2478 if (sym->vmlinux || sym->kernel)
2483 static void write_dump(const char *fname)
2485 struct buffer buf = { };
2486 struct symbol *symbol;
2487 const char *namespace;
2490 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2491 symbol = symbolhash[n];
2493 if (dump_sym(symbol)) {
2494 namespace = symbol->namespace;
2495 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
2496 symbol->crc, symbol->name,
2497 namespace ? namespace : "",
2498 symbol->module->name,
2499 export_str(symbol->export));
2501 symbol = symbol->next;
2504 write_if_changed(&buf, fname);
2508 static void write_namespace_deps_files(void)
2511 struct namespace_list *ns;
2512 struct buffer ns_deps_buf = {};
2514 for (mod = modules; mod; mod = mod->next) {
2515 char fname[PATH_MAX];
2520 ns_deps_buf.pos = 0;
2522 for (ns = mod->required_namespaces; ns; ns = ns->next)
2523 buf_printf(&ns_deps_buf, "%s\n", ns->namespace);
2525 if (ns_deps_buf.pos == 0)
2528 sprintf(fname, "%s.ns_deps", mod->name);
2529 write_if_changed(&ns_deps_buf, fname);
2533 struct ext_sym_list {
2534 struct ext_sym_list *next;
2538 int main(int argc, char **argv)
2541 struct buffer buf = { };
2542 char *kernel_read = NULL, *module_read = NULL;
2543 char *dump_write = NULL, *files_source = NULL;
2547 struct ext_sym_list *extsym_iter;
2548 struct ext_sym_list *extsym_start = NULL;
2550 while ((opt = getopt(argc, argv, "i:I:e:mnsT:o:awEd")) != -1) {
2553 kernel_read = optarg;
2556 module_read = optarg;
2557 external_module = 1;
2560 external_module = 1;
2562 NOFAIL(malloc(sizeof(*extsym_iter)));
2563 extsym_iter->next = extsym_start;
2564 extsym_iter->file = optarg;
2565 extsym_start = extsym_iter;
2571 ignore_missing_files = 1;
2574 dump_write = optarg;
2580 vmlinux_section_warnings = 0;
2583 files_source = optarg;
2586 warn_unresolved = 1;
2589 sec_mismatch_fatal = 1;
2592 write_namespace_deps = 1;
2600 read_dump(kernel_read, 1);
2602 read_dump(module_read, 0);
2603 while (extsym_start) {
2604 read_dump(extsym_start->file, 0);
2605 extsym_iter = extsym_start->next;
2607 extsym_start = extsym_iter;
2610 while (optind < argc)
2611 read_symbols(argv[optind++]);
2614 read_symbols_from_files(files_source);
2618 for (mod = modules; mod; mod = mod->next) {
2619 char fname[PATH_MAX];
2626 err |= check_modname_len(mod);
2627 err |= check_exports(mod);
2628 if (write_namespace_deps)
2631 add_header(&buf, mod);
2632 add_intree_flag(&buf, !external_module);
2633 add_retpoline(&buf);
2634 add_staging_flag(&buf, mod->name);
2635 err |= add_versions(&buf, mod);
2636 add_depends(&buf, mod);
2637 add_moddevtable(&buf, mod);
2638 add_srcversion(&buf, mod);
2640 sprintf(fname, "%s.mod.c", mod->name);
2641 write_if_changed(&buf, fname);
2644 if (write_namespace_deps) {
2645 write_namespace_deps_files();
2650 write_dump(dump_write);
2651 if (sec_mismatch_count && sec_mismatch_fatal)
2652 fatal("modpost: Section mismatches detected.\n"
2653 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
2654 for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
2655 struct symbol *s = symbolhash[n];
2659 warn("\"%s\" [%s] is a static %s\n",
2660 s->name, s->module->name,
2661 export_str(s->export));