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/generated/autoconf.h"
23 #include "../../include/linux/license.h"
24 #include "../../include/linux/export.h"
26 /* Are we using CONFIG_MODVERSIONS? */
27 static int modversions
= 0;
28 /* Warn about undefined symbols? (do so if we have vmlinux) */
29 static int have_vmlinux
= 0;
30 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
31 static int all_versions
= 0;
32 /* If we are modposting external module set to 1 */
33 static int external_module
= 0;
34 /* Warn about section mismatch in vmlinux if set to 1 */
35 static int vmlinux_section_warnings
= 1;
36 /* Only warn about unresolved symbols */
37 static int warn_unresolved
= 0;
38 /* How a symbol is exported */
39 static int sec_mismatch_count
= 0;
40 static int sec_mismatch_verbose
= 1;
41 static int sec_mismatch_fatal
= 0;
42 /* ignore missing files */
43 static int ignore_missing_files
;
46 export_plain
, export_unused
, export_gpl
,
47 export_unused_gpl
, export_gpl_future
, export_unknown
50 #define PRINTF __attribute__ ((format (printf, 1, 2)))
52 PRINTF
void fatal(const char *fmt
, ...)
56 fprintf(stderr
, "FATAL: ");
58 va_start(arglist
, fmt
);
59 vfprintf(stderr
, fmt
, arglist
);
65 PRINTF
void warn(const char *fmt
, ...)
69 fprintf(stderr
, "WARNING: ");
71 va_start(arglist
, fmt
);
72 vfprintf(stderr
, fmt
, arglist
);
76 PRINTF
void merror(const char *fmt
, ...)
80 fprintf(stderr
, "ERROR: ");
82 va_start(arglist
, fmt
);
83 vfprintf(stderr
, fmt
, arglist
);
87 static inline bool strends(const char *str
, const char *postfix
)
89 if (strlen(str
) < strlen(postfix
))
92 return strcmp(str
+ strlen(str
) - strlen(postfix
), postfix
) == 0;
95 static int is_vmlinux(const char *modname
)
99 myname
= strrchr(modname
, '/');
105 return (strcmp(myname
, "vmlinux") == 0) ||
106 (strcmp(myname
, "vmlinux.o") == 0);
109 void *do_nofail(void *ptr
, const char *expr
)
112 fatal("modpost: Memory allocation failure: %s.\n", expr
);
117 /* A list of all modules we processed */
118 static struct module
*modules
;
120 static struct module
*find_module(char *modname
)
124 for (mod
= modules
; mod
; mod
= mod
->next
)
125 if (strcmp(mod
->name
, modname
) == 0)
130 static struct module
*new_module(const char *modname
)
135 mod
= NOFAIL(malloc(sizeof(*mod
)));
136 memset(mod
, 0, sizeof(*mod
));
137 p
= NOFAIL(strdup(modname
));
139 /* strip trailing .o */
140 if (strends(p
, ".o")) {
141 p
[strlen(p
) - 2] = '\0';
147 mod
->gpl_compatible
= -1;
154 /* A hash of all exported symbols,
155 * struct symbol is also used for lists of unresolved symbols */
157 #define SYMBOL_HASH_SIZE 1024
161 struct module
*module
;
165 unsigned int vmlinux
:1; /* 1 if symbol is defined in vmlinux */
166 unsigned int kernel
:1; /* 1 if symbol is from kernel
167 * (only for external modules) **/
168 unsigned int preloaded
:1; /* 1 if symbol from Module.symvers, or crc */
169 enum export export
; /* Type of export */
173 static struct symbol
*symbolhash
[SYMBOL_HASH_SIZE
];
175 /* This is based on the hash agorithm from gdbm, via tdb */
176 static inline unsigned int tdb_hash(const char *name
)
178 unsigned value
; /* Used to compute the hash value. */
179 unsigned i
; /* Used to cycle through random values. */
181 /* Set the initial value from the key size. */
182 for (value
= 0x238F13AF * strlen(name
), i
= 0; name
[i
]; i
++)
183 value
= (value
+ (((unsigned char *)name
)[i
] << (i
*5 % 24)));
185 return (1103515243 * value
+ 12345);
189 * Allocate a new symbols for use in the hash of exported symbols or
190 * the list of unresolved symbols per module
192 static struct symbol
*alloc_symbol(const char *name
, unsigned int weak
,
195 struct symbol
*s
= NOFAIL(malloc(sizeof(*s
) + strlen(name
) + 1));
197 memset(s
, 0, sizeof(*s
));
198 strcpy(s
->name
, name
);
204 /* For the hash of exported symbols */
205 static struct symbol
*new_symbol(const char *name
, struct module
*module
,
211 hash
= tdb_hash(name
) % SYMBOL_HASH_SIZE
;
212 new = symbolhash
[hash
] = alloc_symbol(name
, 0, symbolhash
[hash
]);
213 new->module
= module
;
214 new->export
= export
;
218 static struct symbol
*find_symbol(const char *name
)
222 /* For our purposes, .foo matches foo. PPC64 needs this. */
226 for (s
= symbolhash
[tdb_hash(name
) % SYMBOL_HASH_SIZE
]; s
; s
= s
->next
) {
227 if (strcmp(s
->name
, name
) == 0)
233 static const struct {
237 { .str
= "EXPORT_SYMBOL", .export
= export_plain
},
238 { .str
= "EXPORT_UNUSED_SYMBOL", .export
= export_unused
},
239 { .str
= "EXPORT_SYMBOL_GPL", .export
= export_gpl
},
240 { .str
= "EXPORT_UNUSED_SYMBOL_GPL", .export
= export_unused_gpl
},
241 { .str
= "EXPORT_SYMBOL_GPL_FUTURE", .export
= export_gpl_future
},
242 { .str
= "(unknown)", .export
= export_unknown
},
246 static const char *export_str(enum export ex
)
248 return export_list
[ex
].str
;
251 static enum export
export_no(const char *s
)
256 return export_unknown
;
257 for (i
= 0; export_list
[i
].export
!= export_unknown
; i
++) {
258 if (strcmp(export_list
[i
].str
, s
) == 0)
259 return export_list
[i
].export
;
261 return export_unknown
;
264 static const char *sec_name(struct elf_info
*elf
, int secindex
);
266 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
268 static enum export
export_from_secname(struct elf_info
*elf
, unsigned int sec
)
270 const char *secname
= sec_name(elf
, sec
);
272 if (strstarts(secname
, "___ksymtab+"))
274 else if (strstarts(secname
, "___ksymtab_unused+"))
275 return export_unused
;
276 else if (strstarts(secname
, "___ksymtab_gpl+"))
278 else if (strstarts(secname
, "___ksymtab_unused_gpl+"))
279 return export_unused_gpl
;
280 else if (strstarts(secname
, "___ksymtab_gpl_future+"))
281 return export_gpl_future
;
283 return export_unknown
;
286 static enum export
export_from_sec(struct elf_info
*elf
, unsigned int sec
)
288 if (sec
== elf
->export_sec
)
290 else if (sec
== elf
->export_unused_sec
)
291 return export_unused
;
292 else if (sec
== elf
->export_gpl_sec
)
294 else if (sec
== elf
->export_unused_gpl_sec
)
295 return export_unused_gpl
;
296 else if (sec
== elf
->export_gpl_future_sec
)
297 return export_gpl_future
;
299 return export_unknown
;
303 * Add an exported symbol - it may have already been added without a
304 * CRC, in this case just update the CRC
306 static struct symbol
*sym_add_exported(const char *name
, struct module
*mod
,
309 struct symbol
*s
= find_symbol(name
);
312 s
= new_symbol(name
, mod
, export
);
315 warn("%s: '%s' exported twice. Previous export "
316 "was in %s%s\n", mod
->name
, name
,
318 is_vmlinux(s
->module
->name
) ?"":".ko");
320 /* In case Module.symvers was out of date */
325 s
->vmlinux
= is_vmlinux(mod
->name
);
331 static void sym_update_crc(const char *name
, struct module
*mod
,
332 unsigned int crc
, enum export export
)
334 struct symbol
*s
= find_symbol(name
);
337 s
= new_symbol(name
, mod
, export
);
338 /* Don't complain when we find it later. */
345 void *grab_file(const char *filename
, unsigned long *size
)
348 void *map
= MAP_FAILED
;
351 fd
= open(filename
, O_RDONLY
);
358 map
= mmap(NULL
, *size
, PROT_READ
|PROT_WRITE
, MAP_PRIVATE
, fd
, 0);
362 if (map
== MAP_FAILED
)
368 * Return a copy of the next line in a mmap'ed file.
369 * spaces in the beginning of the line is trimmed away.
370 * Return a pointer to a static buffer.
372 char *get_next_line(unsigned long *pos
, void *file
, unsigned long size
)
374 static char line
[4096];
377 signed char *p
= (signed char *)file
+ *pos
;
380 for (; *pos
< size
; (*pos
)++) {
381 if (skip
&& isspace(*p
)) {
386 if (*p
!= '\n' && (*pos
< size
)) {
390 break; /* Too long, stop */
401 void release_file(void *file
, unsigned long size
)
406 static int parse_elf(struct elf_info
*info
, const char *filename
)
412 const char *secstrings
;
413 unsigned int symtab_idx
= ~0U, symtab_shndx_idx
= ~0U;
415 hdr
= grab_file(filename
, &info
->size
);
417 if (ignore_missing_files
) {
418 fprintf(stderr
, "%s: %s (ignored)\n", filename
,
426 if (info
->size
< sizeof(*hdr
)) {
427 /* file too small, assume this is an empty .o file */
430 /* Is this a valid ELF file? */
431 if ((hdr
->e_ident
[EI_MAG0
] != ELFMAG0
) ||
432 (hdr
->e_ident
[EI_MAG1
] != ELFMAG1
) ||
433 (hdr
->e_ident
[EI_MAG2
] != ELFMAG2
) ||
434 (hdr
->e_ident
[EI_MAG3
] != ELFMAG3
)) {
435 /* Not an ELF file - silently ignore it */
438 /* Fix endianness in ELF header */
439 hdr
->e_type
= TO_NATIVE(hdr
->e_type
);
440 hdr
->e_machine
= TO_NATIVE(hdr
->e_machine
);
441 hdr
->e_version
= TO_NATIVE(hdr
->e_version
);
442 hdr
->e_entry
= TO_NATIVE(hdr
->e_entry
);
443 hdr
->e_phoff
= TO_NATIVE(hdr
->e_phoff
);
444 hdr
->e_shoff
= TO_NATIVE(hdr
->e_shoff
);
445 hdr
->e_flags
= TO_NATIVE(hdr
->e_flags
);
446 hdr
->e_ehsize
= TO_NATIVE(hdr
->e_ehsize
);
447 hdr
->e_phentsize
= TO_NATIVE(hdr
->e_phentsize
);
448 hdr
->e_phnum
= TO_NATIVE(hdr
->e_phnum
);
449 hdr
->e_shentsize
= TO_NATIVE(hdr
->e_shentsize
);
450 hdr
->e_shnum
= TO_NATIVE(hdr
->e_shnum
);
451 hdr
->e_shstrndx
= TO_NATIVE(hdr
->e_shstrndx
);
452 sechdrs
= (void *)hdr
+ hdr
->e_shoff
;
453 info
->sechdrs
= sechdrs
;
455 /* Check if file offset is correct */
456 if (hdr
->e_shoff
> info
->size
) {
457 fatal("section header offset=%lu in file '%s' is bigger than "
458 "filesize=%lu\n", (unsigned long)hdr
->e_shoff
,
459 filename
, info
->size
);
463 if (hdr
->e_shnum
== SHN_UNDEF
) {
465 * There are more than 64k sections,
466 * read count from .sh_size.
468 info
->num_sections
= TO_NATIVE(sechdrs
[0].sh_size
);
471 info
->num_sections
= hdr
->e_shnum
;
473 if (hdr
->e_shstrndx
== SHN_XINDEX
) {
474 info
->secindex_strings
= TO_NATIVE(sechdrs
[0].sh_link
);
477 info
->secindex_strings
= hdr
->e_shstrndx
;
480 /* Fix endianness in section headers */
481 for (i
= 0; i
< info
->num_sections
; i
++) {
482 sechdrs
[i
].sh_name
= TO_NATIVE(sechdrs
[i
].sh_name
);
483 sechdrs
[i
].sh_type
= TO_NATIVE(sechdrs
[i
].sh_type
);
484 sechdrs
[i
].sh_flags
= TO_NATIVE(sechdrs
[i
].sh_flags
);
485 sechdrs
[i
].sh_addr
= TO_NATIVE(sechdrs
[i
].sh_addr
);
486 sechdrs
[i
].sh_offset
= TO_NATIVE(sechdrs
[i
].sh_offset
);
487 sechdrs
[i
].sh_size
= TO_NATIVE(sechdrs
[i
].sh_size
);
488 sechdrs
[i
].sh_link
= TO_NATIVE(sechdrs
[i
].sh_link
);
489 sechdrs
[i
].sh_info
= TO_NATIVE(sechdrs
[i
].sh_info
);
490 sechdrs
[i
].sh_addralign
= TO_NATIVE(sechdrs
[i
].sh_addralign
);
491 sechdrs
[i
].sh_entsize
= TO_NATIVE(sechdrs
[i
].sh_entsize
);
493 /* Find symbol table. */
494 secstrings
= (void *)hdr
+ sechdrs
[info
->secindex_strings
].sh_offset
;
495 for (i
= 1; i
< info
->num_sections
; i
++) {
497 int nobits
= sechdrs
[i
].sh_type
== SHT_NOBITS
;
499 if (!nobits
&& sechdrs
[i
].sh_offset
> info
->size
) {
500 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
501 "sizeof(*hrd)=%zu\n", filename
,
502 (unsigned long)sechdrs
[i
].sh_offset
,
506 secname
= secstrings
+ sechdrs
[i
].sh_name
;
507 if (strcmp(secname
, ".modinfo") == 0) {
509 fatal("%s has NOBITS .modinfo\n", filename
);
510 info
->modinfo
= (void *)hdr
+ sechdrs
[i
].sh_offset
;
511 info
->modinfo_len
= sechdrs
[i
].sh_size
;
512 } else if (strcmp(secname
, "__ksymtab") == 0)
513 info
->export_sec
= i
;
514 else if (strcmp(secname
, "__ksymtab_unused") == 0)
515 info
->export_unused_sec
= i
;
516 else if (strcmp(secname
, "__ksymtab_gpl") == 0)
517 info
->export_gpl_sec
= i
;
518 else if (strcmp(secname
, "__ksymtab_unused_gpl") == 0)
519 info
->export_unused_gpl_sec
= i
;
520 else if (strcmp(secname
, "__ksymtab_gpl_future") == 0)
521 info
->export_gpl_future_sec
= i
;
523 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
524 unsigned int sh_link_idx
;
526 info
->symtab_start
= (void *)hdr
+
527 sechdrs
[i
].sh_offset
;
528 info
->symtab_stop
= (void *)hdr
+
529 sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
;
530 sh_link_idx
= sechdrs
[i
].sh_link
;
531 info
->strtab
= (void *)hdr
+
532 sechdrs
[sh_link_idx
].sh_offset
;
535 /* 32bit section no. table? ("more than 64k sections") */
536 if (sechdrs
[i
].sh_type
== SHT_SYMTAB_SHNDX
) {
537 symtab_shndx_idx
= i
;
538 info
->symtab_shndx_start
= (void *)hdr
+
539 sechdrs
[i
].sh_offset
;
540 info
->symtab_shndx_stop
= (void *)hdr
+
541 sechdrs
[i
].sh_offset
+ sechdrs
[i
].sh_size
;
544 if (!info
->symtab_start
)
545 fatal("%s has no symtab?\n", filename
);
547 /* Fix endianness in symbols */
548 for (sym
= info
->symtab_start
; sym
< info
->symtab_stop
; sym
++) {
549 sym
->st_shndx
= TO_NATIVE(sym
->st_shndx
);
550 sym
->st_name
= TO_NATIVE(sym
->st_name
);
551 sym
->st_value
= TO_NATIVE(sym
->st_value
);
552 sym
->st_size
= TO_NATIVE(sym
->st_size
);
555 if (symtab_shndx_idx
!= ~0U) {
557 if (symtab_idx
!= sechdrs
[symtab_shndx_idx
].sh_link
)
558 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
559 filename
, sechdrs
[symtab_shndx_idx
].sh_link
,
562 for (p
= info
->symtab_shndx_start
; p
< info
->symtab_shndx_stop
;
570 static void parse_elf_finish(struct elf_info
*info
)
572 release_file(info
->hdr
, info
->size
);
575 static int ignore_undef_symbol(struct elf_info
*info
, const char *symname
)
577 /* ignore __this_module, it will be resolved shortly */
578 if (strcmp(symname
, VMLINUX_SYMBOL_STR(__this_module
)) == 0)
580 /* ignore global offset table */
581 if (strcmp(symname
, "_GLOBAL_OFFSET_TABLE_") == 0)
583 if (info
->hdr
->e_machine
== EM_PPC
)
584 /* Special register function linked on all modules during final link of .ko */
585 if (strncmp(symname
, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
586 strncmp(symname
, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
587 strncmp(symname
, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
588 strncmp(symname
, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
589 strncmp(symname
, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
590 strncmp(symname
, "_savevr_", sizeof("_savevr_") - 1) == 0)
592 if (info
->hdr
->e_machine
== EM_PPC64
)
593 /* Special register function linked on all modules during final link of .ko */
594 if (strncmp(symname
, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
595 strncmp(symname
, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
596 strncmp(symname
, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
597 strncmp(symname
, "_savevr_", sizeof("_savevr_") - 1) == 0)
599 /* Do not ignore this symbol */
603 #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
604 #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
606 static void handle_modversions(struct module
*mod
, struct elf_info
*info
,
607 Elf_Sym
*sym
, const char *symname
)
612 if ((!is_vmlinux(mod
->name
) || mod
->is_dot_o
) &&
613 strncmp(symname
, "__ksymtab", 9) == 0)
614 export
= export_from_secname(info
, get_secindex(info
, sym
));
616 export
= export_from_sec(info
, get_secindex(info
, sym
));
619 if (strncmp(symname
, CRC_PFX
, strlen(CRC_PFX
)) == 0) {
620 crc
= (unsigned int) sym
->st_value
;
621 sym_update_crc(symname
+ strlen(CRC_PFX
), mod
, crc
,
625 switch (sym
->st_shndx
) {
627 if (!strncmp(symname
, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
628 /* Should warn here, but modpost runs before the linker */
630 warn("\"%s\" [%s] is COMMON symbol\n", symname
, mod
->name
);
633 /* undefined symbol */
634 if (ELF_ST_BIND(sym
->st_info
) != STB_GLOBAL
&&
635 ELF_ST_BIND(sym
->st_info
) != STB_WEAK
)
637 if (ignore_undef_symbol(info
, symname
))
639 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
640 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
641 /* add compatibility with older glibc */
642 #ifndef STT_SPARC_REGISTER
643 #define STT_SPARC_REGISTER STT_REGISTER
645 if (info
->hdr
->e_machine
== EM_SPARC
||
646 info
->hdr
->e_machine
== EM_SPARCV9
) {
647 /* Ignore register directives. */
648 if (ELF_ST_TYPE(sym
->st_info
) == STT_SPARC_REGISTER
)
650 if (symname
[0] == '.') {
651 char *munged
= strdup(symname
);
653 munged
[1] = toupper(munged
[1]);
659 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
660 if (symname
[0] != '_')
665 mod
->unres
= alloc_symbol(symname
,
666 ELF_ST_BIND(sym
->st_info
) == STB_WEAK
,
670 /* All exported symbols */
671 if (strncmp(symname
, KSYMTAB_PFX
, strlen(KSYMTAB_PFX
)) == 0) {
672 sym_add_exported(symname
+ strlen(KSYMTAB_PFX
), mod
,
675 if (strcmp(symname
, VMLINUX_SYMBOL_STR(init_module
)) == 0)
677 if (strcmp(symname
, VMLINUX_SYMBOL_STR(cleanup_module
)) == 0)
678 mod
->has_cleanup
= 1;
684 * Parse tag=value strings from .modinfo section
686 static char *next_string(char *string
, unsigned long *secsize
)
688 /* Skip non-zero chars */
691 if ((*secsize
)-- <= 1)
695 /* Skip any zero padding. */
698 if ((*secsize
)-- <= 1)
704 static char *get_next_modinfo(void *modinfo
, unsigned long modinfo_len
,
705 const char *tag
, char *info
)
708 unsigned int taglen
= strlen(tag
);
709 unsigned long size
= modinfo_len
;
712 size
-= info
- (char *)modinfo
;
713 modinfo
= next_string(info
, &size
);
716 for (p
= modinfo
; p
; p
= next_string(p
, &size
)) {
717 if (strncmp(p
, tag
, taglen
) == 0 && p
[taglen
] == '=')
718 return p
+ taglen
+ 1;
723 static char *get_modinfo(void *modinfo
, unsigned long modinfo_len
,
727 return get_next_modinfo(modinfo
, modinfo_len
, tag
, NULL
);
731 * Test if string s ends in string sub
734 static int strrcmp(const char *s
, const char *sub
)
742 sublen
= strlen(sub
);
744 if ((slen
== 0) || (sublen
== 0))
750 return memcmp(s
+ slen
- sublen
, sub
, sublen
);
753 static const char *sym_name(struct elf_info
*elf
, Elf_Sym
*sym
)
756 return elf
->strtab
+ sym
->st_name
;
761 static const char *sec_name(struct elf_info
*elf
, int secindex
)
763 Elf_Shdr
*sechdrs
= elf
->sechdrs
;
764 return (void *)elf
->hdr
+
765 elf
->sechdrs
[elf
->secindex_strings
].sh_offset
+
766 sechdrs
[secindex
].sh_name
;
769 static const char *sech_name(struct elf_info
*elf
, Elf_Shdr
*sechdr
)
771 return (void *)elf
->hdr
+
772 elf
->sechdrs
[elf
->secindex_strings
].sh_offset
+
776 /* The pattern is an array of simple patterns.
777 * "foo" will match an exact string equal to "foo"
778 * "*foo" will match a string that ends with "foo"
779 * "foo*" will match a string that begins with "foo"
780 * "*foo*" will match a string that contains "foo"
782 static int match(const char *sym
, const char * const pat
[])
787 const char *endp
= p
+ strlen(p
) - 1;
790 if (*p
== '*' && *endp
== '*') {
791 char *here
, *bare
= strndup(p
+ 1, strlen(p
) - 2);
793 here
= strstr(sym
, bare
);
799 else if (*p
== '*') {
800 if (strrcmp(sym
, p
+ 1) == 0)
804 else if (*endp
== '*') {
805 if (strncmp(sym
, p
, strlen(p
) - 1) == 0)
810 if (strcmp(p
, sym
) == 0)
818 /* sections that we do not want to do full section mismatch check on */
819 static const char *const section_white_list
[] =
823 ".cranges", /* sh64 */
824 ".zdebug*", /* Compressed debug sections. */
825 ".GCC-command-line", /* mn10300 */
826 ".GCC.command.line", /* record-gcc-switches, non mn10300 */
827 ".mdebug*", /* alpha, score, mips etc. */
828 ".pdr", /* alpha, score, mips etc. */
833 ".xt.prop", /* xtensa */
834 ".xt.lit", /* xtensa */
835 ".arcextmap*", /* arc */
836 ".gnu.linkonce.arcext*", /* arc : modules */
842 * This is used to find sections missing the SHF_ALLOC flag.
843 * The cause of this is often a section specified in assembler
844 * without "ax" / "aw".
846 static void check_section(const char *modname
, struct elf_info
*elf
,
849 const char *sec
= sech_name(elf
, sechdr
);
851 if (sechdr
->sh_type
== SHT_PROGBITS
&&
852 !(sechdr
->sh_flags
& SHF_ALLOC
) &&
853 !match(sec
, section_white_list
)) {
854 warn("%s (%s): unexpected non-allocatable section.\n"
855 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
856 "Note that for example <linux/init.h> contains\n"
857 "section definitions for use in .S files.\n\n",
864 #define ALL_INIT_DATA_SECTIONS \
865 ".init.setup", ".init.rodata", ".meminit.rodata", \
866 ".init.data", ".meminit.data"
867 #define ALL_EXIT_DATA_SECTIONS \
868 ".exit.data", ".memexit.data"
870 #define ALL_INIT_TEXT_SECTIONS \
871 ".init.text", ".meminit.text"
872 #define ALL_EXIT_TEXT_SECTIONS \
873 ".exit.text", ".memexit.text"
875 #define ALL_PCI_INIT_SECTIONS \
876 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
877 ".pci_fixup_enable", ".pci_fixup_resume", \
878 ".pci_fixup_resume_early", ".pci_fixup_suspend"
880 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
881 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
883 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
884 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
886 #define DATA_SECTIONS ".data", ".data.rel"
887 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
889 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
890 ".fixup", ".entry.text", ".exception.text", ".text.*", \
893 #define INIT_SECTIONS ".init.*"
894 #define MEM_INIT_SECTIONS ".meminit.*"
896 #define EXIT_SECTIONS ".exit.*"
897 #define MEM_EXIT_SECTIONS ".memexit.*"
899 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
900 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
902 /* init data sections */
903 static const char *const init_data_sections
[] =
904 { ALL_INIT_DATA_SECTIONS
, NULL
};
906 /* all init sections */
907 static const char *const init_sections
[] = { ALL_INIT_SECTIONS
, NULL
};
909 /* All init and exit sections (code + data) */
910 static const char *const init_exit_sections
[] =
911 {ALL_INIT_SECTIONS
, ALL_EXIT_SECTIONS
, NULL
};
913 /* all text sections */
914 static const char *const text_sections
[] = { ALL_TEXT_SECTIONS
, NULL
};
917 static const char *const data_sections
[] = { DATA_SECTIONS
, NULL
};
920 /* symbols in .data that may refer to init/exit sections */
921 #define DEFAULT_SYMBOL_WHITE_LIST \
923 "*_template", /* scsi uses *_template a lot */ \
924 "*_timer", /* arm uses ops structures named _timer a lot */ \
925 "*_sht", /* scsi also used *_sht to some extent */ \
931 static const char *const head_sections
[] = { ".head.text*", NULL
};
932 static const char *const linker_symbols
[] =
933 { "__init_begin", "_sinittext", "_einittext", NULL
};
934 static const char *const optim_symbols
[] = { "*.constprop.*", NULL
};
941 XXXINIT_TO_SOME_INIT
,
942 XXXEXIT_TO_SOME_EXIT
,
943 ANY_INIT_TO_ANY_EXIT
,
944 ANY_EXIT_TO_ANY_INIT
,
950 * Describe how to match sections on different criterias:
952 * @fromsec: Array of sections to be matched.
954 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
955 * this array is forbidden (black-list). Can be empty.
957 * @good_tosec: Relocations applied to a section in @fromsec must be
958 * targetting sections in this array (white-list). Can be empty.
960 * @mismatch: Type of mismatch.
962 * @symbol_white_list: Do not match a relocation to a symbol in this list
963 * even if it is targetting a section in @bad_to_sec.
965 * @handler: Specific handler to call when a match is found. If NULL,
966 * default_mismatch_handler() will be called.
969 struct sectioncheck
{
970 const char *fromsec
[20];
971 const char *bad_tosec
[20];
972 const char *good_tosec
[20];
973 enum mismatch mismatch
;
974 const char *symbol_white_list
[20];
975 void (*handler
)(const char *modname
, struct elf_info
*elf
,
976 const struct sectioncheck
* const mismatch
,
977 Elf_Rela
*r
, Elf_Sym
*sym
, const char *fromsec
);
981 static void extable_mismatch_handler(const char *modname
, struct elf_info
*elf
,
982 const struct sectioncheck
* const mismatch
,
983 Elf_Rela
*r
, Elf_Sym
*sym
,
984 const char *fromsec
);
986 static const struct sectioncheck sectioncheck
[] = {
987 /* Do not reference init/exit code/data from
988 * normal code and data
991 .fromsec
= { TEXT_SECTIONS
, NULL
},
992 .bad_tosec
= { ALL_INIT_SECTIONS
, NULL
},
993 .mismatch
= TEXT_TO_ANY_INIT
,
994 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
997 .fromsec
= { DATA_SECTIONS
, NULL
},
998 .bad_tosec
= { ALL_XXXINIT_SECTIONS
, NULL
},
999 .mismatch
= DATA_TO_ANY_INIT
,
1000 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1003 .fromsec
= { DATA_SECTIONS
, NULL
},
1004 .bad_tosec
= { INIT_SECTIONS
, NULL
},
1005 .mismatch
= DATA_TO_ANY_INIT
,
1006 .symbol_white_list
= {
1007 "*_template", "*_timer", "*_sht", "*_ops",
1008 "*_probe", "*_probe_one", "*_console", NULL
1012 .fromsec
= { TEXT_SECTIONS
, NULL
},
1013 .bad_tosec
= { ALL_EXIT_SECTIONS
, NULL
},
1014 .mismatch
= TEXT_TO_ANY_EXIT
,
1015 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1018 .fromsec
= { DATA_SECTIONS
, NULL
},
1019 .bad_tosec
= { ALL_EXIT_SECTIONS
, NULL
},
1020 .mismatch
= DATA_TO_ANY_EXIT
,
1021 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1023 /* Do not reference init code/data from meminit code/data */
1025 .fromsec
= { ALL_XXXINIT_SECTIONS
, NULL
},
1026 .bad_tosec
= { INIT_SECTIONS
, NULL
},
1027 .mismatch
= XXXINIT_TO_SOME_INIT
,
1028 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1030 /* Do not reference exit code/data from memexit code/data */
1032 .fromsec
= { ALL_XXXEXIT_SECTIONS
, NULL
},
1033 .bad_tosec
= { EXIT_SECTIONS
, NULL
},
1034 .mismatch
= XXXEXIT_TO_SOME_EXIT
,
1035 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1037 /* Do not use exit code/data from init code */
1039 .fromsec
= { ALL_INIT_SECTIONS
, NULL
},
1040 .bad_tosec
= { ALL_EXIT_SECTIONS
, NULL
},
1041 .mismatch
= ANY_INIT_TO_ANY_EXIT
,
1042 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1044 /* Do not use init code/data from exit code */
1046 .fromsec
= { ALL_EXIT_SECTIONS
, NULL
},
1047 .bad_tosec
= { ALL_INIT_SECTIONS
, NULL
},
1048 .mismatch
= ANY_EXIT_TO_ANY_INIT
,
1049 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1052 .fromsec
= { ALL_PCI_INIT_SECTIONS
, NULL
},
1053 .bad_tosec
= { INIT_SECTIONS
, NULL
},
1054 .mismatch
= ANY_INIT_TO_ANY_EXIT
,
1055 .symbol_white_list
= { NULL
},
1057 /* Do not export init/exit functions or data */
1059 .fromsec
= { "__ksymtab*", NULL
},
1060 .bad_tosec
= { INIT_SECTIONS
, EXIT_SECTIONS
, NULL
},
1061 .mismatch
= EXPORT_TO_INIT_EXIT
,
1062 .symbol_white_list
= { DEFAULT_SYMBOL_WHITE_LIST
, NULL
},
1065 .fromsec
= { "__ex_table", NULL
},
1066 /* If you're adding any new black-listed sections in here, consider
1067 * adding a special 'printer' for them in scripts/check_extable.
1069 .bad_tosec
= { ".altinstr_replacement", NULL
},
1070 .good_tosec
= {ALL_TEXT_SECTIONS
, NULL
},
1071 .mismatch
= EXTABLE_TO_NON_TEXT
,
1072 .handler
= extable_mismatch_handler
,
1076 static const struct sectioncheck
*section_mismatch(
1077 const char *fromsec
, const char *tosec
)
1080 int elems
= sizeof(sectioncheck
) / sizeof(struct sectioncheck
);
1081 const struct sectioncheck
*check
= §ioncheck
[0];
1084 * The target section could be the SHT_NUL section when we're
1085 * handling relocations to un-resolved symbols, trying to match it
1086 * doesn't make much sense and causes build failures on parisc and
1087 * mn10300 architectures.
1092 for (i
= 0; i
< elems
; i
++) {
1093 if (match(fromsec
, check
->fromsec
)) {
1094 if (check
->bad_tosec
[0] && match(tosec
, check
->bad_tosec
))
1096 if (check
->good_tosec
[0] && !match(tosec
, check
->good_tosec
))
1105 * Whitelist to allow certain references to pass with no warning.
1108 * If a module parameter is declared __initdata and permissions=0
1109 * then this is legal despite the warning generated.
1110 * We cannot see value of permissions here, so just ignore
1112 * The pattern is identified by:
1113 * tosec = .init.data
1118 * module_param_call() ops can refer to __init set function if permissions=0
1119 * The pattern is identified by:
1120 * tosec = .init.text
1122 * atsym = __param_ops_*
1125 * Many drivers utilise a *driver container with references to
1126 * add, remove, probe functions etc.
1127 * the pattern is identified by:
1128 * tosec = init or exit section
1129 * fromsec = data section
1130 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1131 * *probe_one, *_console, *_timer
1134 * Whitelist all references from .head.text to any init section
1137 * Some symbols belong to init section but still it is ok to reference
1138 * these from non-init sections as these symbols don't have any memory
1139 * allocated for them and symbol address and value are same. So even
1140 * if init section is freed, its ok to reference those symbols.
1141 * For ex. symbols marking the init section boundaries.
1142 * This pattern is identified by
1143 * refsymname = __init_begin, _sinittext, _einittext
1146 * GCC may optimize static inlines when fed constant arg(s) resulting
1147 * in functions like cpumask_empty() -- generating an associated symbol
1148 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1149 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1150 * meaningless section warning. May need to add isra symbols too...
1151 * This pattern is identified by
1152 * tosec = init section
1153 * fromsec = text section
1154 * refsymname = *.constprop.*
1157 static int secref_whitelist(const struct sectioncheck
*mismatch
,
1158 const char *fromsec
, const char *fromsym
,
1159 const char *tosec
, const char *tosym
)
1161 /* Check for pattern 1 */
1162 if (match(tosec
, init_data_sections
) &&
1163 match(fromsec
, data_sections
) &&
1164 (strncmp(fromsym
, "__param", strlen("__param")) == 0))
1167 /* Check for pattern 1a */
1168 if (strcmp(tosec
, ".init.text") == 0 &&
1169 match(fromsec
, data_sections
) &&
1170 (strncmp(fromsym
, "__param_ops_", strlen("__param_ops_")) == 0))
1173 /* Check for pattern 2 */
1174 if (match(tosec
, init_exit_sections
) &&
1175 match(fromsec
, data_sections
) &&
1176 match(fromsym
, mismatch
->symbol_white_list
))
1179 /* Check for pattern 3 */
1180 if (match(fromsec
, head_sections
) &&
1181 match(tosec
, init_sections
))
1184 /* Check for pattern 4 */
1185 if (match(tosym
, linker_symbols
))
1188 /* Check for pattern 5 */
1189 if (match(fromsec
, text_sections
) &&
1190 match(tosec
, init_sections
) &&
1191 match(fromsym
, optim_symbols
))
1198 * Find symbol based on relocation record info.
1199 * In some cases the symbol supplied is a valid symbol so
1200 * return refsym. If st_name != 0 we assume this is a valid symbol.
1201 * In other cases the symbol needs to be looked up in the symbol table
1202 * based on section and address.
1204 static Elf_Sym
*find_elf_symbol(struct elf_info
*elf
, Elf64_Sword addr
,
1208 Elf_Sym
*near
= NULL
;
1209 Elf64_Sword distance
= 20;
1211 unsigned int relsym_secindex
;
1213 if (relsym
->st_name
!= 0)
1216 relsym_secindex
= get_secindex(elf
, relsym
);
1217 for (sym
= elf
->symtab_start
; sym
< elf
->symtab_stop
; sym
++) {
1218 if (get_secindex(elf
, sym
) != relsym_secindex
)
1220 if (ELF_ST_TYPE(sym
->st_info
) == STT_SECTION
)
1222 if (sym
->st_value
== addr
)
1224 /* Find a symbol nearby - addr are maybe negative */
1225 d
= sym
->st_value
- addr
;
1227 d
= addr
- sym
->st_value
;
1233 /* We need a close match */
1240 static inline int is_arm_mapping_symbol(const char *str
)
1242 return str
[0] == '$' && strchr("axtd", str
[1])
1243 && (str
[2] == '\0' || str
[2] == '.');
1247 * If there's no name there, ignore it; likewise, ignore it if it's
1248 * one of the magic symbols emitted used by current ARM tools.
1250 * Otherwise if find_symbols_between() returns those symbols, they'll
1251 * fail the whitelist tests and cause lots of false alarms ... fixable
1252 * only by merging __exit and __init sections into __text, bloating
1253 * the kernel (which is especially evil on embedded platforms).
1255 static inline int is_valid_name(struct elf_info
*elf
, Elf_Sym
*sym
)
1257 const char *name
= elf
->strtab
+ sym
->st_name
;
1259 if (!name
|| !strlen(name
))
1261 return !is_arm_mapping_symbol(name
);
1265 * Find symbols before or equal addr and after addr - in the section sec.
1266 * If we find two symbols with equal offset prefer one with a valid name.
1267 * The ELF format may have a better way to detect what type of symbol
1268 * it is, but this works for now.
1270 static Elf_Sym
*find_elf_symbol2(struct elf_info
*elf
, Elf_Addr addr
,
1274 Elf_Sym
*near
= NULL
;
1275 Elf_Addr distance
= ~0;
1277 for (sym
= elf
->symtab_start
; sym
< elf
->symtab_stop
; sym
++) {
1280 if (is_shndx_special(sym
->st_shndx
))
1282 symsec
= sec_name(elf
, get_secindex(elf
, sym
));
1283 if (strcmp(symsec
, sec
) != 0)
1285 if (!is_valid_name(elf
, sym
))
1287 if (sym
->st_value
<= addr
) {
1288 if ((addr
- sym
->st_value
) < distance
) {
1289 distance
= addr
- sym
->st_value
;
1291 } else if ((addr
- sym
->st_value
) == distance
) {
1300 * Convert a section name to the function/data attribute
1301 * .init.text => __init
1302 * .memexitconst => __memconst
1305 * The memory of returned value has been allocated on a heap. The user of this
1306 * method should free it after usage.
1308 static char *sec2annotation(const char *s
)
1310 if (match(s
, init_exit_sections
)) {
1311 char *p
= malloc(20);
1318 while (*s
&& *s
!= '.')
1323 if (strstr(s
, "rodata") != NULL
)
1324 strcat(p
, "const ");
1325 else if (strstr(s
, "data") != NULL
)
1335 static int is_function(Elf_Sym
*sym
)
1338 return ELF_ST_TYPE(sym
->st_info
) == STT_FUNC
;
1343 static void print_section_list(const char * const list
[20])
1345 const char *const *s
= list
;
1348 fprintf(stderr
, "%s", *s
);
1351 fprintf(stderr
, ", ");
1353 fprintf(stderr
, "\n");
1356 static inline void get_pretty_name(int is_func
, const char** name
, const char** name_p
)
1359 case 0: *name
= "variable"; *name_p
= ""; break;
1360 case 1: *name
= "function"; *name_p
= "()"; break;
1361 default: *name
= "(unknown reference)"; *name_p
= ""; break;
1366 * Print a warning about a section mismatch.
1367 * Try to find symbols near it so user can find it.
1368 * Check whitelist before warning - it may be a false positive.
1370 static void report_sec_mismatch(const char *modname
,
1371 const struct sectioncheck
*mismatch
,
1372 const char *fromsec
,
1373 unsigned long long fromaddr
,
1374 const char *fromsym
,
1376 const char *tosec
, const char *tosym
,
1379 const char *from
, *from_p
;
1380 const char *to
, *to_p
;
1384 sec_mismatch_count
++;
1385 if (!sec_mismatch_verbose
)
1388 get_pretty_name(from_is_func
, &from
, &from_p
);
1389 get_pretty_name(to_is_func
, &to
, &to_p
);
1391 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1392 "to the %s %s:%s%s\n",
1393 modname
, fromsec
, fromaddr
, from
, fromsym
, from_p
, to
, tosec
,
1396 switch (mismatch
->mismatch
) {
1397 case TEXT_TO_ANY_INIT
:
1398 prl_from
= sec2annotation(fromsec
);
1399 prl_to
= sec2annotation(tosec
);
1401 "The function %s%s() references\n"
1403 "This is often because %s lacks a %s\n"
1404 "annotation or the annotation of %s is wrong.\n",
1406 to
, prl_to
, tosym
, to_p
,
1407 fromsym
, prl_to
, tosym
);
1411 case DATA_TO_ANY_INIT
: {
1412 prl_to
= sec2annotation(tosec
);
1414 "The variable %s references\n"
1416 "If the reference is valid then annotate the\n"
1417 "variable with __init* or __refdata (see linux/init.h) "
1418 "or name the variable:\n",
1419 fromsym
, to
, prl_to
, tosym
, to_p
);
1420 print_section_list(mismatch
->symbol_white_list
);
1424 case TEXT_TO_ANY_EXIT
:
1425 prl_to
= sec2annotation(tosec
);
1427 "The function %s() references a %s in an exit section.\n"
1428 "Often the %s %s%s has valid usage outside the exit section\n"
1429 "and the fix is to remove the %sannotation of %s.\n",
1430 fromsym
, to
, to
, tosym
, to_p
, prl_to
, tosym
);
1433 case DATA_TO_ANY_EXIT
: {
1434 prl_to
= sec2annotation(tosec
);
1436 "The variable %s references\n"
1438 "If the reference is valid then annotate the\n"
1439 "variable with __exit* (see linux/init.h) or "
1440 "name the variable:\n",
1441 fromsym
, to
, prl_to
, tosym
, to_p
);
1442 print_section_list(mismatch
->symbol_white_list
);
1446 case XXXINIT_TO_SOME_INIT
:
1447 case XXXEXIT_TO_SOME_EXIT
:
1448 prl_from
= sec2annotation(fromsec
);
1449 prl_to
= sec2annotation(tosec
);
1451 "The %s %s%s%s references\n"
1453 "If %s is only used by %s then\n"
1454 "annotate %s with a matching annotation.\n",
1455 from
, prl_from
, fromsym
, from_p
,
1456 to
, prl_to
, tosym
, to_p
,
1457 tosym
, fromsym
, tosym
);
1461 case ANY_INIT_TO_ANY_EXIT
:
1462 prl_from
= sec2annotation(fromsec
);
1463 prl_to
= sec2annotation(tosec
);
1465 "The %s %s%s%s references\n"
1467 "This is often seen when error handling "
1468 "in the init function\n"
1469 "uses functionality in the exit path.\n"
1470 "The fix is often to remove the %sannotation of\n"
1471 "%s%s so it may be used outside an exit section.\n",
1472 from
, prl_from
, fromsym
, from_p
,
1473 to
, prl_to
, tosym
, to_p
,
1474 prl_to
, tosym
, to_p
);
1478 case ANY_EXIT_TO_ANY_INIT
:
1479 prl_from
= sec2annotation(fromsec
);
1480 prl_to
= sec2annotation(tosec
);
1482 "The %s %s%s%s references\n"
1484 "This is often seen when error handling "
1485 "in the exit function\n"
1486 "uses functionality in the init path.\n"
1487 "The fix is often to remove the %sannotation of\n"
1488 "%s%s so it may be used outside an init section.\n",
1489 from
, prl_from
, fromsym
, from_p
,
1490 to
, prl_to
, tosym
, to_p
,
1491 prl_to
, tosym
, to_p
);
1495 case EXPORT_TO_INIT_EXIT
:
1496 prl_to
= sec2annotation(tosec
);
1498 "The symbol %s is exported and annotated %s\n"
1499 "Fix this by removing the %sannotation of %s "
1500 "or drop the export.\n",
1501 tosym
, prl_to
, prl_to
, tosym
);
1504 case EXTABLE_TO_NON_TEXT
:
1505 fatal("There's a special handler for this mismatch type, "
1506 "we should never get here.");
1509 fprintf(stderr
, "\n");
1512 static void default_mismatch_handler(const char *modname
, struct elf_info
*elf
,
1513 const struct sectioncheck
* const mismatch
,
1514 Elf_Rela
*r
, Elf_Sym
*sym
, const char *fromsec
)
1520 const char *fromsym
;
1522 from
= find_elf_symbol2(elf
, r
->r_offset
, fromsec
);
1523 fromsym
= sym_name(elf
, from
);
1525 if (!strncmp(fromsym
, "reference___initcall",
1526 sizeof("reference___initcall")-1))
1529 tosec
= sec_name(elf
, get_secindex(elf
, sym
));
1530 to
= find_elf_symbol(elf
, r
->r_addend
, sym
);
1531 tosym
= sym_name(elf
, to
);
1533 /* check whitelist - we may ignore it */
1534 if (secref_whitelist(mismatch
,
1535 fromsec
, fromsym
, tosec
, tosym
)) {
1536 report_sec_mismatch(modname
, mismatch
,
1537 fromsec
, r
->r_offset
, fromsym
,
1538 is_function(from
), tosec
, tosym
,
1543 static int is_executable_section(struct elf_info
* elf
, unsigned int section_index
)
1545 if (section_index
> elf
->num_sections
)
1546 fatal("section_index is outside elf->num_sections!\n");
1548 return ((elf
->sechdrs
[section_index
].sh_flags
& SHF_EXECINSTR
) == SHF_EXECINSTR
);
1552 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1553 * to know the sizeof(struct exception_table_entry) for the target architecture.
1555 static unsigned int extable_entry_size
= 0;
1556 static void find_extable_entry_size(const char* const sec
, const Elf_Rela
* r
)
1559 * If we're currently checking the second relocation within __ex_table,
1560 * that relocation offset tells us the offsetof(struct
1561 * exception_table_entry, fixup) which is equal to sizeof(struct
1562 * exception_table_entry) divided by two. We use that to our advantage
1563 * since there's no portable way to get that size as every architecture
1564 * seems to go with different sized types. Not pretty but better than
1565 * hard-coding the size for every architecture..
1567 if (!extable_entry_size
)
1568 extable_entry_size
= r
->r_offset
* 2;
1571 static inline bool is_extable_fault_address(Elf_Rela
*r
)
1574 * extable_entry_size is only discovered after we've handled the
1575 * _second_ relocation in __ex_table, so only abort when we're not
1576 * handling the first reloc and extable_entry_size is zero.
1578 if (r
->r_offset
&& extable_entry_size
== 0)
1579 fatal("extable_entry size hasn't been discovered!\n");
1581 return ((r
->r_offset
== 0) ||
1582 (r
->r_offset
% extable_entry_size
== 0));
1585 #define is_second_extable_reloc(Start, Cur, Sec) \
1586 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1588 static void report_extable_warnings(const char* modname
, struct elf_info
* elf
,
1589 const struct sectioncheck
* const mismatch
,
1590 Elf_Rela
* r
, Elf_Sym
* sym
,
1591 const char* fromsec
, const char* tosec
)
1593 Elf_Sym
* fromsym
= find_elf_symbol2(elf
, r
->r_offset
, fromsec
);
1594 const char* fromsym_name
= sym_name(elf
, fromsym
);
1595 Elf_Sym
* tosym
= find_elf_symbol(elf
, r
->r_addend
, sym
);
1596 const char* tosym_name
= sym_name(elf
, tosym
);
1597 const char* from_pretty_name
;
1598 const char* from_pretty_name_p
;
1599 const char* to_pretty_name
;
1600 const char* to_pretty_name_p
;
1602 get_pretty_name(is_function(fromsym
),
1603 &from_pretty_name
, &from_pretty_name_p
);
1604 get_pretty_name(is_function(tosym
),
1605 &to_pretty_name
, &to_pretty_name_p
);
1607 warn("%s(%s+0x%lx): Section mismatch in reference"
1608 " from the %s %s%s to the %s %s:%s%s\n",
1609 modname
, fromsec
, (long)r
->r_offset
, from_pretty_name
,
1610 fromsym_name
, from_pretty_name_p
,
1611 to_pretty_name
, tosec
, tosym_name
, to_pretty_name_p
);
1613 if (!match(tosec
, mismatch
->bad_tosec
) &&
1614 is_executable_section(elf
, get_secindex(elf
, sym
)))
1616 "The relocation at %s+0x%lx references\n"
1617 "section \"%s\" which is not in the list of\n"
1618 "authorized sections. If you're adding a new section\n"
1619 "and/or if this reference is valid, add \"%s\" to the\n"
1620 "list of authorized sections to jump to on fault.\n"
1621 "This can be achieved by adding \"%s\" to \n"
1622 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1623 fromsec
, (long)r
->r_offset
, tosec
, tosec
, tosec
);
1626 static void extable_mismatch_handler(const char* modname
, struct elf_info
*elf
,
1627 const struct sectioncheck
* const mismatch
,
1628 Elf_Rela
* r
, Elf_Sym
* sym
,
1629 const char *fromsec
)
1631 const char* tosec
= sec_name(elf
, get_secindex(elf
, sym
));
1633 sec_mismatch_count
++;
1635 if (sec_mismatch_verbose
)
1636 report_extable_warnings(modname
, elf
, mismatch
, r
, sym
,
1639 if (match(tosec
, mismatch
->bad_tosec
))
1640 fatal("The relocation at %s+0x%lx references\n"
1641 "section \"%s\" which is black-listed.\n"
1642 "Something is seriously wrong and should be fixed.\n"
1643 "You might get more information about where this is\n"
1644 "coming from by using scripts/check_extable.sh %s\n",
1645 fromsec
, (long)r
->r_offset
, tosec
, modname
);
1646 else if (!is_executable_section(elf
, get_secindex(elf
, sym
))) {
1647 if (is_extable_fault_address(r
))
1648 fatal("The relocation at %s+0x%lx references\n"
1649 "section \"%s\" which is not executable, IOW\n"
1650 "it is not possible for the kernel to fault\n"
1651 "at that address. Something is seriously wrong\n"
1652 "and should be fixed.\n",
1653 fromsec
, (long)r
->r_offset
, tosec
);
1655 fatal("The relocation at %s+0x%lx references\n"
1656 "section \"%s\" which is not executable, IOW\n"
1657 "the kernel will fault if it ever tries to\n"
1658 "jump to it. Something is seriously wrong\n"
1659 "and should be fixed.\n",
1660 fromsec
, (long)r
->r_offset
, tosec
);
1664 static void check_section_mismatch(const char *modname
, struct elf_info
*elf
,
1665 Elf_Rela
*r
, Elf_Sym
*sym
, const char *fromsec
)
1667 const char *tosec
= sec_name(elf
, get_secindex(elf
, sym
));;
1668 const struct sectioncheck
*mismatch
= section_mismatch(fromsec
, tosec
);
1671 if (mismatch
->handler
)
1672 mismatch
->handler(modname
, elf
, mismatch
,
1675 default_mismatch_handler(modname
, elf
, mismatch
,
1680 static unsigned int *reloc_location(struct elf_info
*elf
,
1681 Elf_Shdr
*sechdr
, Elf_Rela
*r
)
1683 Elf_Shdr
*sechdrs
= elf
->sechdrs
;
1684 int section
= sechdr
->sh_info
;
1686 return (void *)elf
->hdr
+ sechdrs
[section
].sh_offset
+
1690 static int addend_386_rel(struct elf_info
*elf
, Elf_Shdr
*sechdr
, Elf_Rela
*r
)
1692 unsigned int r_typ
= ELF_R_TYPE(r
->r_info
);
1693 unsigned int *location
= reloc_location(elf
, sechdr
, r
);
1697 r
->r_addend
= TO_NATIVE(*location
);
1700 r
->r_addend
= TO_NATIVE(*location
) + 4;
1701 /* For CONFIG_RELOCATABLE=y */
1702 if (elf
->hdr
->e_type
== ET_EXEC
)
1703 r
->r_addend
+= r
->r_offset
;
1710 #define R_ARM_CALL 28
1712 #ifndef R_ARM_JUMP24
1713 #define R_ARM_JUMP24 29
1716 #ifndef R_ARM_THM_CALL
1717 #define R_ARM_THM_CALL 10
1719 #ifndef R_ARM_THM_JUMP24
1720 #define R_ARM_THM_JUMP24 30
1722 #ifndef R_ARM_THM_JUMP19
1723 #define R_ARM_THM_JUMP19 51
1726 static int addend_arm_rel(struct elf_info
*elf
, Elf_Shdr
*sechdr
, Elf_Rela
*r
)
1728 unsigned int r_typ
= ELF_R_TYPE(r
->r_info
);
1732 /* From ARM ABI: (S + A) | T */
1733 r
->r_addend
= (int)(long)
1734 (elf
->symtab_start
+ ELF_R_SYM(r
->r_info
));
1739 case R_ARM_THM_CALL
:
1740 case R_ARM_THM_JUMP24
:
1741 case R_ARM_THM_JUMP19
:
1742 /* From ARM ABI: ((S + A) | T) - P */
1743 r
->r_addend
= (int)(long)(elf
->hdr
+
1745 (r
->r_offset
- sechdr
->sh_addr
));
1753 static int addend_mips_rel(struct elf_info
*elf
, Elf_Shdr
*sechdr
, Elf_Rela
*r
)
1755 unsigned int r_typ
= ELF_R_TYPE(r
->r_info
);
1756 unsigned int *location
= reloc_location(elf
, sechdr
, r
);
1759 if (r_typ
== R_MIPS_HI16
)
1760 return 1; /* skip this */
1761 inst
= TO_NATIVE(*location
);
1764 r
->r_addend
= inst
& 0xffff;
1767 r
->r_addend
= (inst
& 0x03ffffff) << 2;
1776 static void section_rela(const char *modname
, struct elf_info
*elf
,
1783 const char *fromsec
;
1785 Elf_Rela
*start
= (void *)elf
->hdr
+ sechdr
->sh_offset
;
1786 Elf_Rela
*stop
= (void *)start
+ sechdr
->sh_size
;
1788 fromsec
= sech_name(elf
, sechdr
);
1789 fromsec
+= strlen(".rela");
1790 /* if from section (name) is know good then skip it */
1791 if (match(fromsec
, section_white_list
))
1794 for (rela
= start
; rela
< stop
; rela
++) {
1795 r
.r_offset
= TO_NATIVE(rela
->r_offset
);
1796 #if KERNEL_ELFCLASS == ELFCLASS64
1797 if (elf
->hdr
->e_machine
== EM_MIPS
) {
1799 r_sym
= ELF64_MIPS_R_SYM(rela
->r_info
);
1800 r_sym
= TO_NATIVE(r_sym
);
1801 r_typ
= ELF64_MIPS_R_TYPE(rela
->r_info
);
1802 r
.r_info
= ELF64_R_INFO(r_sym
, r_typ
);
1804 r
.r_info
= TO_NATIVE(rela
->r_info
);
1805 r_sym
= ELF_R_SYM(r
.r_info
);
1808 r
.r_info
= TO_NATIVE(rela
->r_info
);
1809 r_sym
= ELF_R_SYM(r
.r_info
);
1811 r
.r_addend
= TO_NATIVE(rela
->r_addend
);
1812 sym
= elf
->symtab_start
+ r_sym
;
1813 /* Skip special sections */
1814 if (is_shndx_special(sym
->st_shndx
))
1816 if (is_second_extable_reloc(start
, rela
, fromsec
))
1817 find_extable_entry_size(fromsec
, &r
);
1818 check_section_mismatch(modname
, elf
, &r
, sym
, fromsec
);
1822 static void section_rel(const char *modname
, struct elf_info
*elf
,
1829 const char *fromsec
;
1831 Elf_Rel
*start
= (void *)elf
->hdr
+ sechdr
->sh_offset
;
1832 Elf_Rel
*stop
= (void *)start
+ sechdr
->sh_size
;
1834 fromsec
= sech_name(elf
, sechdr
);
1835 fromsec
+= strlen(".rel");
1836 /* if from section (name) is know good then skip it */
1837 if (match(fromsec
, section_white_list
))
1840 for (rel
= start
; rel
< stop
; rel
++) {
1841 r
.r_offset
= TO_NATIVE(rel
->r_offset
);
1842 #if KERNEL_ELFCLASS == ELFCLASS64
1843 if (elf
->hdr
->e_machine
== EM_MIPS
) {
1845 r_sym
= ELF64_MIPS_R_SYM(rel
->r_info
);
1846 r_sym
= TO_NATIVE(r_sym
);
1847 r_typ
= ELF64_MIPS_R_TYPE(rel
->r_info
);
1848 r
.r_info
= ELF64_R_INFO(r_sym
, r_typ
);
1850 r
.r_info
= TO_NATIVE(rel
->r_info
);
1851 r_sym
= ELF_R_SYM(r
.r_info
);
1854 r
.r_info
= TO_NATIVE(rel
->r_info
);
1855 r_sym
= ELF_R_SYM(r
.r_info
);
1858 switch (elf
->hdr
->e_machine
) {
1860 if (addend_386_rel(elf
, sechdr
, &r
))
1864 if (addend_arm_rel(elf
, sechdr
, &r
))
1868 if (addend_mips_rel(elf
, sechdr
, &r
))
1872 sym
= elf
->symtab_start
+ r_sym
;
1873 /* Skip special sections */
1874 if (is_shndx_special(sym
->st_shndx
))
1876 if (is_second_extable_reloc(start
, rel
, fromsec
))
1877 find_extable_entry_size(fromsec
, &r
);
1878 check_section_mismatch(modname
, elf
, &r
, sym
, fromsec
);
1883 * A module includes a number of sections that are discarded
1884 * either when loaded or when used as built-in.
1885 * For loaded modules all functions marked __init and all data
1886 * marked __initdata will be discarded when the module has been initialized.
1887 * Likewise for modules used built-in the sections marked __exit
1888 * are discarded because __exit marked function are supposed to be called
1889 * only when a module is unloaded which never happens for built-in modules.
1890 * The check_sec_ref() function traverses all relocation records
1891 * to find all references to a section that reference a section that will
1892 * be discarded and warns about it.
1894 static void check_sec_ref(struct module
*mod
, const char *modname
,
1895 struct elf_info
*elf
)
1898 Elf_Shdr
*sechdrs
= elf
->sechdrs
;
1900 /* Walk through all sections */
1901 for (i
= 0; i
< elf
->num_sections
; i
++) {
1902 check_section(modname
, elf
, &elf
->sechdrs
[i
]);
1903 /* We want to process only relocation sections and not .init */
1904 if (sechdrs
[i
].sh_type
== SHT_RELA
)
1905 section_rela(modname
, elf
, &elf
->sechdrs
[i
]);
1906 else if (sechdrs
[i
].sh_type
== SHT_REL
)
1907 section_rel(modname
, elf
, &elf
->sechdrs
[i
]);
1911 static char *remove_dot(char *s
)
1913 size_t n
= strcspn(s
, ".");
1916 size_t m
= strspn(s
+ n
+ 1, "0123456789");
1917 if (m
&& (s
[n
+ m
] == '.' || s
[n
+ m
] == 0))
1923 static void read_symbols(char *modname
)
1925 const char *symname
;
1929 struct elf_info info
= { };
1932 if (!parse_elf(&info
, modname
))
1935 mod
= new_module(modname
);
1937 /* When there's no vmlinux, don't print warnings about
1938 * unresolved symbols (since there'll be too many ;) */
1939 if (is_vmlinux(modname
)) {
1944 license
= get_modinfo(info
.modinfo
, info
.modinfo_len
, "license");
1945 if (info
.modinfo
&& !license
&& !is_vmlinux(modname
))
1946 warn("modpost: missing MODULE_LICENSE() in %s\n"
1947 "see include/linux/module.h for "
1948 "more information\n", modname
);
1950 if (license_is_gpl_compatible(license
))
1951 mod
->gpl_compatible
= 1;
1953 mod
->gpl_compatible
= 0;
1956 license
= get_next_modinfo(info
.modinfo
, info
.modinfo_len
,
1957 "license", license
);
1960 for (sym
= info
.symtab_start
; sym
< info
.symtab_stop
; sym
++) {
1961 symname
= remove_dot(info
.strtab
+ sym
->st_name
);
1963 handle_modversions(mod
, &info
, sym
, symname
);
1964 handle_moddevtable(mod
, &info
, sym
, symname
);
1966 if (!is_vmlinux(modname
) ||
1967 (is_vmlinux(modname
) && vmlinux_section_warnings
))
1968 check_sec_ref(mod
, modname
, &info
);
1970 version
= get_modinfo(info
.modinfo
, info
.modinfo_len
, "version");
1972 maybe_frob_rcs_version(modname
, version
, info
.modinfo
,
1973 version
- (char *)info
.hdr
);
1974 if (version
|| (all_versions
&& !is_vmlinux(modname
)))
1975 get_src_version(modname
, mod
->srcversion
,
1976 sizeof(mod
->srcversion
)-1);
1978 parse_elf_finish(&info
);
1980 /* Our trick to get versioning for module struct etc. - it's
1981 * never passed as an argument to an exported function, so
1982 * the automatic versioning doesn't pick it up, but it's really
1983 * important anyhow */
1985 mod
->unres
= alloc_symbol("module_layout", 0, mod
->unres
);
1988 static void read_symbols_from_files(const char *filename
)
1991 char fname
[PATH_MAX
];
1993 if (strcmp(filename
, "-") != 0) {
1994 in
= fopen(filename
, "r");
1996 fatal("Can't open filenames file %s: %m", filename
);
1999 while (fgets(fname
, PATH_MAX
, in
) != NULL
) {
2000 if (strends(fname
, "\n"))
2001 fname
[strlen(fname
)-1] = '\0';
2002 read_symbols(fname
);
2011 /* We first write the generated file into memory using the
2012 * following helper, then compare to the file on disk and
2013 * only update the later if anything changed */
2015 void __attribute__((format(printf
, 2, 3))) buf_printf(struct buffer
*buf
,
2016 const char *fmt
, ...)
2023 len
= vsnprintf(tmp
, SZ
, fmt
, ap
);
2024 buf_write(buf
, tmp
, len
);
2028 void buf_write(struct buffer
*buf
, const char *s
, int len
)
2030 if (buf
->size
- buf
->pos
< len
) {
2031 buf
->size
+= len
+ SZ
;
2032 buf
->p
= realloc(buf
->p
, buf
->size
);
2034 strncpy(buf
->p
+ buf
->pos
, s
, len
);
2038 static void check_for_gpl_usage(enum export exp
, const char *m
, const char *s
)
2040 const char *e
= is_vmlinux(m
) ?"":".ko";
2044 fatal("modpost: GPL-incompatible module %s%s "
2045 "uses GPL-only symbol '%s'\n", m
, e
, s
);
2047 case export_unused_gpl
:
2048 fatal("modpost: GPL-incompatible module %s%s "
2049 "uses GPL-only symbol marked UNUSED '%s'\n", m
, e
, s
);
2051 case export_gpl_future
:
2052 warn("modpost: GPL-incompatible module %s%s "
2053 "uses future GPL-only symbol '%s'\n", m
, e
, s
);
2057 case export_unknown
:
2063 static void check_for_unused(enum export exp
, const char *m
, const char *s
)
2065 const char *e
= is_vmlinux(m
) ?"":".ko";
2069 case export_unused_gpl
:
2070 warn("modpost: module %s%s "
2071 "uses symbol '%s' marked UNUSED\n", m
, e
, s
);
2079 static void check_exports(struct module
*mod
)
2081 struct symbol
*s
, *exp
;
2083 for (s
= mod
->unres
; s
; s
= s
->next
) {
2084 const char *basename
;
2085 exp
= find_symbol(s
->name
);
2086 if (!exp
|| exp
->module
== mod
)
2088 basename
= strrchr(mod
->name
, '/');
2092 basename
= mod
->name
;
2093 if (!mod
->gpl_compatible
)
2094 check_for_gpl_usage(exp
->export
, basename
, exp
->name
);
2095 check_for_unused(exp
->export
, basename
, exp
->name
);
2100 * Header for the generated file
2102 static void add_header(struct buffer
*b
, struct module
*mod
)
2104 buf_printf(b
, "#include <linux/module.h>\n");
2105 buf_printf(b
, "#include <linux/vermagic.h>\n");
2106 buf_printf(b
, "#include <linux/compiler.h>\n");
2107 buf_printf(b
, "\n");
2108 buf_printf(b
, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2109 buf_printf(b
, "\n");
2110 buf_printf(b
, "__visible struct module __this_module\n");
2111 buf_printf(b
, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
2112 buf_printf(b
, "\t.name = KBUILD_MODNAME,\n");
2114 buf_printf(b
, "\t.init = init_module,\n");
2115 if (mod
->has_cleanup
)
2116 buf_printf(b
, "#ifdef CONFIG_MODULE_UNLOAD\n"
2117 "\t.exit = cleanup_module,\n"
2119 buf_printf(b
, "\t.arch = MODULE_ARCH_INIT,\n");
2120 buf_printf(b
, "};\n");
2123 static void add_intree_flag(struct buffer
*b
, int is_intree
)
2126 buf_printf(b
, "\nMODULE_INFO(intree, \"Y\");\n");
2129 static void add_staging_flag(struct buffer
*b
, const char *name
)
2131 static const char *staging_dir
= "drivers/staging";
2133 if (strncmp(staging_dir
, name
, strlen(staging_dir
)) == 0)
2134 buf_printf(b
, "\nMODULE_INFO(staging, \"Y\");\n");
2137 /* In kernel, this size is defined in linux/module.h;
2138 * here we use Elf_Addr instead of long for covering cross-compile
2140 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
2143 * Record CRCs for unresolved symbols
2145 static int add_versions(struct buffer
*b
, struct module
*mod
)
2147 struct symbol
*s
, *exp
;
2150 for (s
= mod
->unres
; s
; s
= s
->next
) {
2151 exp
= find_symbol(s
->name
);
2152 if (!exp
|| exp
->module
== mod
) {
2153 if (have_vmlinux
&& !s
->weak
) {
2154 if (warn_unresolved
) {
2155 warn("\"%s\" [%s.ko] undefined!\n",
2156 s
->name
, mod
->name
);
2158 merror("\"%s\" [%s.ko] undefined!\n",
2159 s
->name
, mod
->name
);
2165 s
->module
= exp
->module
;
2166 s
->crc_valid
= exp
->crc_valid
;
2173 buf_printf(b
, "\n");
2174 buf_printf(b
, "static const struct modversion_info ____versions[]\n");
2175 buf_printf(b
, "__used\n");
2176 buf_printf(b
, "__attribute__((section(\"__versions\"))) = {\n");
2178 for (s
= mod
->unres
; s
; s
= s
->next
) {
2181 if (!s
->crc_valid
) {
2182 warn("\"%s\" [%s.ko] has no CRC!\n",
2183 s
->name
, mod
->name
);
2186 if (strlen(s
->name
) >= MODULE_NAME_LEN
) {
2187 merror("too long symbol \"%s\" [%s.ko]\n",
2188 s
->name
, mod
->name
);
2192 buf_printf(b
, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
2196 buf_printf(b
, "};\n");
2201 static void add_depends(struct buffer
*b
, struct module
*mod
,
2202 struct module
*modules
)
2208 for (m
= modules
; m
; m
= m
->next
)
2209 m
->seen
= is_vmlinux(m
->name
);
2211 buf_printf(b
, "\n");
2212 buf_printf(b
, "static const char __module_depends[]\n");
2213 buf_printf(b
, "__used\n");
2214 buf_printf(b
, "__attribute__((section(\".modinfo\"))) =\n");
2215 buf_printf(b
, "\"depends=");
2216 for (s
= mod
->unres
; s
; s
= s
->next
) {
2221 if (s
->module
->seen
)
2224 s
->module
->seen
= 1;
2225 p
= strrchr(s
->module
->name
, '/');
2229 p
= s
->module
->name
;
2230 buf_printf(b
, "%s%s", first
? "" : ",", p
);
2233 buf_printf(b
, "\";\n");
2236 static void add_srcversion(struct buffer
*b
, struct module
*mod
)
2238 if (mod
->srcversion
[0]) {
2239 buf_printf(b
, "\n");
2240 buf_printf(b
, "MODULE_INFO(srcversion, \"%s\");\n",
2245 static void write_if_changed(struct buffer
*b
, const char *fname
)
2251 file
= fopen(fname
, "r");
2255 if (fstat(fileno(file
), &st
) < 0)
2258 if (st
.st_size
!= b
->pos
)
2261 tmp
= NOFAIL(malloc(b
->pos
));
2262 if (fread(tmp
, 1, b
->pos
, file
) != b
->pos
)
2265 if (memcmp(tmp
, b
->p
, b
->pos
) != 0)
2277 file
= fopen(fname
, "w");
2282 if (fwrite(b
->p
, 1, b
->pos
, file
) != b
->pos
) {
2289 /* parse Module.symvers file. line format:
2290 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2292 static void read_dump(const char *fname
, unsigned int kernel
)
2294 unsigned long size
, pos
= 0;
2295 void *file
= grab_file(fname
, &size
);
2299 /* No symbol versions, silently ignore */
2302 while ((line
= get_next_line(&pos
, file
, size
))) {
2303 char *symname
, *modname
, *d
, *export
, *end
;
2308 if (!(symname
= strchr(line
, '\t')))
2311 if (!(modname
= strchr(symname
, '\t')))
2314 if ((export
= strchr(modname
, '\t')) != NULL
)
2316 if (export
&& ((end
= strchr(export
, '\t')) != NULL
))
2318 crc
= strtoul(line
, &d
, 16);
2319 if (*symname
== '\0' || *modname
== '\0' || *d
!= '\0')
2321 mod
= find_module(modname
);
2323 if (is_vmlinux(modname
))
2325 mod
= new_module(modname
);
2328 s
= sym_add_exported(symname
, mod
, export_no(export
));
2331 sym_update_crc(symname
, mod
, crc
, export_no(export
));
2333 release_file(file
, size
);
2336 release_file(file
, size
);
2337 fatal("parse error in symbol dump file\n");
2340 /* For normal builds always dump all symbols.
2341 * For external modules only dump symbols
2342 * that are not read from kernel Module.symvers.
2344 static int dump_sym(struct symbol
*sym
)
2346 if (!external_module
)
2348 if (sym
->vmlinux
|| sym
->kernel
)
2353 static void write_dump(const char *fname
)
2355 struct buffer buf
= { };
2356 struct symbol
*symbol
;
2359 for (n
= 0; n
< SYMBOL_HASH_SIZE
; n
++) {
2360 symbol
= symbolhash
[n
];
2362 if (dump_sym(symbol
))
2363 buf_printf(&buf
, "0x%08x\t%s\t%s\t%s\n",
2364 symbol
->crc
, symbol
->name
,
2365 symbol
->module
->name
,
2366 export_str(symbol
->export
));
2367 symbol
= symbol
->next
;
2370 write_if_changed(&buf
, fname
);
2373 struct ext_sym_list
{
2374 struct ext_sym_list
*next
;
2378 int main(int argc
, char **argv
)
2381 struct buffer buf
= { };
2382 char *kernel_read
= NULL
, *module_read
= NULL
;
2383 char *dump_write
= NULL
, *files_source
= NULL
;
2386 struct ext_sym_list
*extsym_iter
;
2387 struct ext_sym_list
*extsym_start
= NULL
;
2389 while ((opt
= getopt(argc
, argv
, "i:I:e:mnsST:o:awM:K:E")) != -1) {
2392 kernel_read
= optarg
;
2395 module_read
= optarg
;
2396 external_module
= 1;
2399 external_module
= 1;
2401 NOFAIL(malloc(sizeof(*extsym_iter
)));
2402 extsym_iter
->next
= extsym_start
;
2403 extsym_iter
->file
= optarg
;
2404 extsym_start
= extsym_iter
;
2410 ignore_missing_files
= 1;
2413 dump_write
= optarg
;
2419 vmlinux_section_warnings
= 0;
2422 sec_mismatch_verbose
= 0;
2425 files_source
= optarg
;
2428 warn_unresolved
= 1;
2431 sec_mismatch_fatal
= 1;
2439 read_dump(kernel_read
, 1);
2441 read_dump(module_read
, 0);
2442 while (extsym_start
) {
2443 read_dump(extsym_start
->file
, 0);
2444 extsym_iter
= extsym_start
->next
;
2446 extsym_start
= extsym_iter
;
2449 while (optind
< argc
)
2450 read_symbols(argv
[optind
++]);
2453 read_symbols_from_files(files_source
);
2455 for (mod
= modules
; mod
; mod
= mod
->next
) {
2463 for (mod
= modules
; mod
; mod
= mod
->next
) {
2464 char fname
[PATH_MAX
];
2471 add_header(&buf
, mod
);
2472 add_intree_flag(&buf
, !external_module
);
2473 add_staging_flag(&buf
, mod
->name
);
2474 err
|= add_versions(&buf
, mod
);
2475 add_depends(&buf
, mod
, modules
);
2476 add_moddevtable(&buf
, mod
);
2477 add_srcversion(&buf
, mod
);
2479 sprintf(fname
, "%s.mod.c", mod
->name
);
2480 write_if_changed(&buf
, fname
);
2483 write_dump(dump_write
);
2484 if (sec_mismatch_count
) {
2485 if (!sec_mismatch_verbose
) {
2486 warn("modpost: Found %d section mismatch(es).\n"
2487 "To see full details build your kernel with:\n"
2488 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2489 sec_mismatch_count
);
2491 if (sec_mismatch_fatal
) {
2492 fatal("modpost: Section mismatches detected.\n"
2493 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");