Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
df578e7d | 5 | * Copyright 2006-2008 Sam Ravnborg |
1da177e4 LT |
6 | * Based in part on module-init-tools/depmod.c,file2alias |
7 | * | |
8 | * This software may be used and distributed according to the terms | |
9 | * of the GNU General Public License, incorporated herein by reference. | |
10 | * | |
11 | * Usage: modpost vmlinux module1.o module2.o ... | |
12 | */ | |
13 | ||
b2e3e658 MD |
14 | #define _GNU_SOURCE |
15 | #include <stdio.h> | |
1da177e4 | 16 | #include <ctype.h> |
5003bab8 | 17 | #include <string.h> |
d4ef1c30 | 18 | #include <stdbool.h> |
1da177e4 | 19 | #include "modpost.h" |
5a865c06 | 20 | #include "../../include/generated/autoconf.h" |
b817f6fe | 21 | #include "../../include/linux/license.h" |
b92021b0 | 22 | #include "../../include/linux/export.h" |
9e1b9b80 | 23 | |
1da177e4 LT |
24 | /* Are we using CONFIG_MODVERSIONS? */ |
25 | int modversions = 0; | |
26 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
27 | int have_vmlinux = 0; | |
28 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
29 | static int all_versions = 0; | |
040fcc81 SR |
30 | /* If we are modposting external module set to 1 */ |
31 | static int external_module = 0; | |
8d8d8289 SR |
32 | /* Warn about section mismatch in vmlinux if set to 1 */ |
33 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
34 | /* Only warn about unresolved symbols */ |
35 | static int warn_unresolved = 0; | |
bd5cbced | 36 | /* How a symbol is exported */ |
588ccd73 SR |
37 | static int sec_mismatch_count = 0; |
38 | static int sec_mismatch_verbose = 1; | |
39 | ||
c96fca21 SR |
40 | enum export { |
41 | export_plain, export_unused, export_gpl, | |
42 | export_unused_gpl, export_gpl_future, export_unknown | |
43 | }; | |
1da177e4 | 44 | |
6d9a89ea AK |
45 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
46 | ||
47 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
48 | { |
49 | va_list arglist; | |
50 | ||
51 | fprintf(stderr, "FATAL: "); | |
52 | ||
53 | va_start(arglist, fmt); | |
54 | vfprintf(stderr, fmt, arglist); | |
55 | va_end(arglist); | |
56 | ||
57 | exit(1); | |
58 | } | |
59 | ||
6d9a89ea | 60 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
61 | { |
62 | va_list arglist; | |
63 | ||
64 | fprintf(stderr, "WARNING: "); | |
65 | ||
66 | va_start(arglist, fmt); | |
67 | vfprintf(stderr, fmt, arglist); | |
68 | va_end(arglist); | |
69 | } | |
70 | ||
6d9a89ea | 71 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
72 | { |
73 | va_list arglist; | |
74 | ||
75 | fprintf(stderr, "ERROR: "); | |
76 | ||
77 | va_start(arglist, fmt); | |
78 | vfprintf(stderr, fmt, arglist); | |
79 | va_end(arglist); | |
80 | } | |
81 | ||
d4ef1c30 RR |
82 | static inline bool strends(const char *str, const char *postfix) |
83 | { | |
84 | if (strlen(str) < strlen(postfix)) | |
85 | return false; | |
86 | ||
87 | return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; | |
88 | } | |
89 | ||
040fcc81 SR |
90 | static int is_vmlinux(const char *modname) |
91 | { | |
92 | const char *myname; | |
93 | ||
df578e7d SR |
94 | myname = strrchr(modname, '/'); |
95 | if (myname) | |
040fcc81 SR |
96 | myname++; |
97 | else | |
98 | myname = modname; | |
99 | ||
741f98fe SR |
100 | return (strcmp(myname, "vmlinux") == 0) || |
101 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
102 | } |
103 | ||
1da177e4 LT |
104 | void *do_nofail(void *ptr, const char *expr) |
105 | { | |
df578e7d | 106 | if (!ptr) |
1da177e4 | 107 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 108 | |
1da177e4 LT |
109 | return ptr; |
110 | } | |
111 | ||
112 | /* A list of all modules we processed */ | |
1da177e4 LT |
113 | static struct module *modules; |
114 | ||
5c3ead8c | 115 | static struct module *find_module(char *modname) |
1da177e4 LT |
116 | { |
117 | struct module *mod; | |
118 | ||
119 | for (mod = modules; mod; mod = mod->next) | |
120 | if (strcmp(mod->name, modname) == 0) | |
121 | break; | |
122 | return mod; | |
123 | } | |
124 | ||
d4ef1c30 | 125 | static struct module *new_module(const char *modname) |
1da177e4 LT |
126 | { |
127 | struct module *mod; | |
d4ef1c30 | 128 | char *p; |
62070fa4 | 129 | |
1da177e4 LT |
130 | mod = NOFAIL(malloc(sizeof(*mod))); |
131 | memset(mod, 0, sizeof(*mod)); | |
132 | p = NOFAIL(strdup(modname)); | |
133 | ||
134 | /* strip trailing .o */ | |
d4ef1c30 RR |
135 | if (strends(p, ".o")) { |
136 | p[strlen(p) - 2] = '\0'; | |
137 | mod->is_dot_o = 1; | |
138 | } | |
1da177e4 LT |
139 | |
140 | /* add to list */ | |
141 | mod->name = p; | |
b817f6fe | 142 | mod->gpl_compatible = -1; |
1da177e4 LT |
143 | mod->next = modules; |
144 | modules = mod; | |
145 | ||
146 | return mod; | |
147 | } | |
148 | ||
149 | /* A hash of all exported symbols, | |
150 | * struct symbol is also used for lists of unresolved symbols */ | |
151 | ||
152 | #define SYMBOL_HASH_SIZE 1024 | |
153 | ||
154 | struct symbol { | |
155 | struct symbol *next; | |
156 | struct module *module; | |
157 | unsigned int crc; | |
158 | int crc_valid; | |
159 | unsigned int weak:1; | |
040fcc81 SR |
160 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
161 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
162 | * (only for external modules) **/ | |
8e70c458 | 163 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 164 | enum export export; /* Type of export */ |
1da177e4 LT |
165 | char name[0]; |
166 | }; | |
167 | ||
168 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
169 | ||
170 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
171 | static inline unsigned int tdb_hash(const char *name) | |
172 | { | |
173 | unsigned value; /* Used to compute the hash value. */ | |
174 | unsigned i; /* Used to cycle through random values. */ | |
175 | ||
176 | /* Set the initial value from the key size. */ | |
df578e7d | 177 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
178 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
179 | ||
180 | return (1103515243 * value + 12345); | |
181 | } | |
182 | ||
5c3ead8c SR |
183 | /** |
184 | * Allocate a new symbols for use in the hash of exported symbols or | |
185 | * the list of unresolved symbols per module | |
186 | **/ | |
187 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
188 | struct symbol *next) | |
1da177e4 LT |
189 | { |
190 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
191 | ||
192 | memset(s, 0, sizeof(*s)); | |
193 | strcpy(s->name, name); | |
194 | s->weak = weak; | |
195 | s->next = next; | |
196 | return s; | |
197 | } | |
198 | ||
199 | /* For the hash of exported symbols */ | |
bd5cbced RP |
200 | static struct symbol *new_symbol(const char *name, struct module *module, |
201 | enum export export) | |
1da177e4 LT |
202 | { |
203 | unsigned int hash; | |
204 | struct symbol *new; | |
205 | ||
206 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
207 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
208 | new->module = module; | |
bd5cbced | 209 | new->export = export; |
040fcc81 | 210 | return new; |
1da177e4 LT |
211 | } |
212 | ||
5c3ead8c | 213 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
214 | { |
215 | struct symbol *s; | |
216 | ||
217 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
218 | if (name[0] == '.') | |
219 | name++; | |
220 | ||
df578e7d | 221 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
222 | if (strcmp(s->name, name) == 0) |
223 | return s; | |
224 | } | |
225 | return NULL; | |
226 | } | |
227 | ||
bd5cbced RP |
228 | static struct { |
229 | const char *str; | |
230 | enum export export; | |
231 | } export_list[] = { | |
232 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 233 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 234 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 235 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
236 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
237 | { .str = "(unknown)", .export = export_unknown }, | |
238 | }; | |
239 | ||
240 | ||
241 | static const char *export_str(enum export ex) | |
242 | { | |
243 | return export_list[ex].str; | |
244 | } | |
245 | ||
df578e7d | 246 | static enum export export_no(const char *s) |
bd5cbced RP |
247 | { |
248 | int i; | |
df578e7d | 249 | |
534b89a9 SR |
250 | if (!s) |
251 | return export_unknown; | |
bd5cbced RP |
252 | for (i = 0; export_list[i].export != export_unknown; i++) { |
253 | if (strcmp(export_list[i].str, s) == 0) | |
254 | return export_list[i].export; | |
255 | } | |
256 | return export_unknown; | |
257 | } | |
258 | ||
62a26356 AIB |
259 | static const char *sec_name(struct elf_info *elf, int secindex); |
260 | ||
261 | #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) | |
262 | ||
263 | static enum export export_from_secname(struct elf_info *elf, unsigned int sec) | |
264 | { | |
265 | const char *secname = sec_name(elf, sec); | |
266 | ||
267 | if (strstarts(secname, "___ksymtab+")) | |
268 | return export_plain; | |
269 | else if (strstarts(secname, "___ksymtab_unused+")) | |
270 | return export_unused; | |
271 | else if (strstarts(secname, "___ksymtab_gpl+")) | |
272 | return export_gpl; | |
273 | else if (strstarts(secname, "___ksymtab_unused_gpl+")) | |
274 | return export_unused_gpl; | |
275 | else if (strstarts(secname, "___ksymtab_gpl_future+")) | |
276 | return export_gpl_future; | |
277 | else | |
278 | return export_unknown; | |
279 | } | |
280 | ||
1ce53adf | 281 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
282 | { |
283 | if (sec == elf->export_sec) | |
284 | return export_plain; | |
c96fca21 SR |
285 | else if (sec == elf->export_unused_sec) |
286 | return export_unused; | |
bd5cbced RP |
287 | else if (sec == elf->export_gpl_sec) |
288 | return export_gpl; | |
c96fca21 SR |
289 | else if (sec == elf->export_unused_gpl_sec) |
290 | return export_unused_gpl; | |
bd5cbced RP |
291 | else if (sec == elf->export_gpl_future_sec) |
292 | return export_gpl_future; | |
293 | else | |
294 | return export_unknown; | |
295 | } | |
296 | ||
5c3ead8c SR |
297 | /** |
298 | * Add an exported symbol - it may have already been added without a | |
299 | * CRC, in this case just update the CRC | |
300 | **/ | |
bd5cbced RP |
301 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
302 | enum export export) | |
1da177e4 LT |
303 | { |
304 | struct symbol *s = find_symbol(name); | |
305 | ||
306 | if (!s) { | |
bd5cbced | 307 | s = new_symbol(name, mod, export); |
8e70c458 SR |
308 | } else { |
309 | if (!s->preloaded) { | |
7b75b13c | 310 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
311 | "was in %s%s\n", mod->name, name, |
312 | s->module->name, | |
313 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
314 | } else { |
315 | /* In case Modules.symvers was out of date */ | |
316 | s->module = mod; | |
8e70c458 | 317 | } |
1da177e4 | 318 | } |
8e70c458 | 319 | s->preloaded = 0; |
040fcc81 SR |
320 | s->vmlinux = is_vmlinux(mod->name); |
321 | s->kernel = 0; | |
bd5cbced | 322 | s->export = export; |
040fcc81 SR |
323 | return s; |
324 | } | |
325 | ||
326 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 327 | unsigned int crc, enum export export) |
040fcc81 SR |
328 | { |
329 | struct symbol *s = find_symbol(name); | |
330 | ||
331 | if (!s) | |
bd5cbced | 332 | s = new_symbol(name, mod, export); |
040fcc81 SR |
333 | s->crc = crc; |
334 | s->crc_valid = 1; | |
1da177e4 LT |
335 | } |
336 | ||
5c3ead8c | 337 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
338 | { |
339 | struct stat st; | |
eb3d5cc6 | 340 | void *map = MAP_FAILED; |
1da177e4 LT |
341 | int fd; |
342 | ||
343 | fd = open(filename, O_RDONLY); | |
eb3d5cc6 | 344 | if (fd < 0) |
1da177e4 | 345 | return NULL; |
eb3d5cc6 JJ |
346 | if (fstat(fd, &st)) |
347 | goto failed; | |
1da177e4 LT |
348 | |
349 | *size = st.st_size; | |
350 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
1da177e4 | 351 | |
eb3d5cc6 JJ |
352 | failed: |
353 | close(fd); | |
1da177e4 LT |
354 | if (map == MAP_FAILED) |
355 | return NULL; | |
356 | return map; | |
357 | } | |
358 | ||
5c3ead8c SR |
359 | /** |
360 | * Return a copy of the next line in a mmap'ed file. | |
361 | * spaces in the beginning of the line is trimmed away. | |
362 | * Return a pointer to a static buffer. | |
363 | **/ | |
df578e7d | 364 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
365 | { |
366 | static char line[4096]; | |
367 | int skip = 1; | |
368 | size_t len = 0; | |
369 | signed char *p = (signed char *)file + *pos; | |
370 | char *s = line; | |
371 | ||
df578e7d | 372 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
373 | if (skip && isspace(*p)) { |
374 | p++; | |
375 | continue; | |
376 | } | |
377 | skip = 0; | |
378 | if (*p != '\n' && (*pos < size)) { | |
379 | len++; | |
380 | *s++ = *p++; | |
381 | if (len > 4095) | |
382 | break; /* Too long, stop */ | |
383 | } else { | |
384 | /* End of string */ | |
385 | *s = '\0'; | |
386 | return line; | |
387 | } | |
388 | } | |
389 | /* End of buffer */ | |
390 | return NULL; | |
391 | } | |
392 | ||
5c3ead8c | 393 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
394 | { |
395 | munmap(file, size); | |
396 | } | |
397 | ||
85bd2fdd | 398 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
399 | { |
400 | unsigned int i; | |
85bd2fdd | 401 | Elf_Ehdr *hdr; |
1da177e4 LT |
402 | Elf_Shdr *sechdrs; |
403 | Elf_Sym *sym; | |
1ce53adf DV |
404 | const char *secstrings; |
405 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
406 | |
407 | hdr = grab_file(filename, &info->size); | |
408 | if (!hdr) { | |
409 | perror(filename); | |
6803dc0e | 410 | exit(1); |
1da177e4 LT |
411 | } |
412 | info->hdr = hdr; | |
85bd2fdd SR |
413 | if (info->size < sizeof(*hdr)) { |
414 | /* file too small, assume this is an empty .o file */ | |
415 | return 0; | |
416 | } | |
417 | /* Is this a valid ELF file? */ | |
418 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
419 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
420 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
421 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
422 | /* Not an ELF file - silently ignore it */ | |
423 | return 0; | |
424 | } | |
1da177e4 | 425 | /* Fix endianness in ELF header */ |
7d875a02 AK |
426 | hdr->e_type = TO_NATIVE(hdr->e_type); |
427 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
428 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
429 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
430 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
431 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
432 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
433 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
434 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
435 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
436 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
437 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
438 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
439 | sechdrs = (void *)hdr + hdr->e_shoff; |
440 | info->sechdrs = sechdrs; | |
441 | ||
a83710e5 PS |
442 | /* Check if file offset is correct */ |
443 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
444 | fatal("section header offset=%lu in file '%s' is bigger than " |
445 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
446 | filename, info->size); | |
a83710e5 PS |
447 | return 0; |
448 | } | |
449 | ||
6845756b | 450 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
451 | /* |
452 | * There are more than 64k sections, | |
453 | * read count from .sh_size. | |
1ce53adf DV |
454 | */ |
455 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
456 | } | |
457 | else { | |
458 | info->num_sections = hdr->e_shnum; | |
459 | } | |
460 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 461 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
462 | } |
463 | else { | |
464 | info->secindex_strings = hdr->e_shstrndx; | |
465 | } | |
466 | ||
1da177e4 | 467 | /* Fix endianness in section headers */ |
1ce53adf | 468 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
469 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
470 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
471 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
472 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
473 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
474 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
475 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
476 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
477 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
478 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
479 | } |
480 | /* Find symbol table. */ | |
1ce53adf DV |
481 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
482 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 483 | const char *secname; |
56fc82c5 | 484 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 485 | |
56fc82c5 | 486 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
487 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
488 | "sizeof(*hrd)=%zu\n", filename, | |
489 | (unsigned long)sechdrs[i].sh_offset, | |
490 | sizeof(*hdr)); | |
85bd2fdd SR |
491 | return 0; |
492 | } | |
bd5cbced RP |
493 | secname = secstrings + sechdrs[i].sh_name; |
494 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
495 | if (nobits) |
496 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
497 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
498 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
499 | } else if (strcmp(secname, "__ksymtab") == 0) |
500 | info->export_sec = i; | |
c96fca21 SR |
501 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
502 | info->export_unused_sec = i; | |
bd5cbced RP |
503 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
504 | info->export_gpl_sec = i; | |
c96fca21 SR |
505 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
506 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
507 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
508 | info->export_gpl_future_sec = i; | |
509 | ||
1ce53adf DV |
510 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
511 | unsigned int sh_link_idx; | |
512 | symtab_idx = i; | |
513 | info->symtab_start = (void *)hdr + | |
514 | sechdrs[i].sh_offset; | |
515 | info->symtab_stop = (void *)hdr + | |
516 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 517 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
518 | info->strtab = (void *)hdr + |
519 | sechdrs[sh_link_idx].sh_offset; | |
520 | } | |
1da177e4 | 521 | |
1ce53adf DV |
522 | /* 32bit section no. table? ("more than 64k sections") */ |
523 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
524 | symtab_shndx_idx = i; | |
525 | info->symtab_shndx_start = (void *)hdr + | |
526 | sechdrs[i].sh_offset; | |
527 | info->symtab_shndx_stop = (void *)hdr + | |
528 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
529 | } | |
1da177e4 | 530 | } |
df578e7d | 531 | if (!info->symtab_start) |
cb80514d | 532 | fatal("%s has no symtab?\n", filename); |
df578e7d | 533 | |
1da177e4 LT |
534 | /* Fix endianness in symbols */ |
535 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
536 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
537 | sym->st_name = TO_NATIVE(sym->st_name); | |
538 | sym->st_value = TO_NATIVE(sym->st_value); | |
539 | sym->st_size = TO_NATIVE(sym->st_size); | |
540 | } | |
1ce53adf DV |
541 | |
542 | if (symtab_shndx_idx != ~0U) { | |
543 | Elf32_Word *p; | |
6845756b | 544 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 545 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 546 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
547 | symtab_idx); |
548 | /* Fix endianness */ | |
549 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
550 | p++) | |
551 | *p = TO_NATIVE(*p); | |
552 | } | |
553 | ||
85bd2fdd | 554 | return 1; |
1da177e4 LT |
555 | } |
556 | ||
5c3ead8c | 557 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
558 | { |
559 | release_file(info->hdr, info->size); | |
560 | } | |
561 | ||
4d7365d6 SR |
562 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
563 | { | |
564 | /* ignore __this_module, it will be resolved shortly */ | |
b92021b0 | 565 | if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0) |
4d7365d6 SR |
566 | return 1; |
567 | /* ignore global offset table */ | |
568 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
569 | return 1; | |
570 | if (info->hdr->e_machine == EM_PPC) | |
571 | /* Special register function linked on all modules during final link of .ko */ | |
572 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
573 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
574 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
575 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
576 | return 1; | |
7fca5dc8 SR |
577 | if (info->hdr->e_machine == EM_PPC64) |
578 | /* Special register function linked on all modules during final link of .ko */ | |
579 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
580 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) | |
581 | return 1; | |
4d7365d6 SR |
582 | /* Do not ignore this symbol */ |
583 | return 0; | |
584 | } | |
585 | ||
b92021b0 RR |
586 | #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_) |
587 | #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_) | |
1da177e4 | 588 | |
5c3ead8c SR |
589 | static void handle_modversions(struct module *mod, struct elf_info *info, |
590 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
591 | { |
592 | unsigned int crc; | |
62a26356 AIB |
593 | enum export export; |
594 | ||
258f7426 FR |
595 | if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
596 | strncmp(symname, "__ksymtab", 9) == 0) | |
62a26356 AIB |
597 | export = export_from_secname(info, get_secindex(info, sym)); |
598 | else | |
599 | export = export_from_sec(info, get_secindex(info, sym)); | |
1da177e4 LT |
600 | |
601 | switch (sym->st_shndx) { | |
602 | case SHN_COMMON: | |
cb80514d | 603 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
604 | break; |
605 | case SHN_ABS: | |
606 | /* CRC'd symbol */ | |
8d99513c | 607 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 608 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
609 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
610 | export); | |
1da177e4 LT |
611 | } |
612 | break; | |
613 | case SHN_UNDEF: | |
614 | /* undefined symbol */ | |
615 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
616 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
617 | break; | |
4d7365d6 | 618 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 619 | break; |
8d529014 BC |
620 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
621 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
622 | /* add compatibility with older glibc */ | |
623 | #ifndef STT_SPARC_REGISTER | |
624 | #define STT_SPARC_REGISTER STT_REGISTER | |
625 | #endif | |
1da177e4 LT |
626 | if (info->hdr->e_machine == EM_SPARC || |
627 | info->hdr->e_machine == EM_SPARCV9) { | |
628 | /* Ignore register directives. */ | |
8d529014 | 629 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 630 | break; |
62070fa4 SR |
631 | if (symname[0] == '.') { |
632 | char *munged = strdup(symname); | |
633 | munged[0] = '_'; | |
634 | munged[1] = toupper(munged[1]); | |
635 | symname = munged; | |
636 | } | |
1da177e4 LT |
637 | } |
638 | #endif | |
62070fa4 | 639 | |
b92021b0 RR |
640 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
641 | if (symname[0] != '_') | |
642 | break; | |
643 | else | |
644 | symname++; | |
645 | #endif | |
646 | mod->unres = alloc_symbol(symname, | |
647 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
648 | mod->unres); | |
1da177e4 LT |
649 | break; |
650 | default: | |
651 | /* All exported symbols */ | |
8d99513c | 652 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
653 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
654 | export); | |
1da177e4 | 655 | } |
b92021b0 | 656 | if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0) |
1da177e4 | 657 | mod->has_init = 1; |
b92021b0 | 658 | if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0) |
1da177e4 LT |
659 | mod->has_cleanup = 1; |
660 | break; | |
661 | } | |
662 | } | |
663 | ||
5c3ead8c SR |
664 | /** |
665 | * Parse tag=value strings from .modinfo section | |
666 | **/ | |
1da177e4 LT |
667 | static char *next_string(char *string, unsigned long *secsize) |
668 | { | |
669 | /* Skip non-zero chars */ | |
670 | while (string[0]) { | |
671 | string++; | |
672 | if ((*secsize)-- <= 1) | |
673 | return NULL; | |
674 | } | |
675 | ||
676 | /* Skip any zero padding. */ | |
677 | while (!string[0]) { | |
678 | string++; | |
679 | if ((*secsize)-- <= 1) | |
680 | return NULL; | |
681 | } | |
682 | return string; | |
683 | } | |
684 | ||
b817f6fe SR |
685 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
686 | const char *tag, char *info) | |
1da177e4 LT |
687 | { |
688 | char *p; | |
689 | unsigned int taglen = strlen(tag); | |
690 | unsigned long size = modinfo_len; | |
691 | ||
b817f6fe SR |
692 | if (info) { |
693 | size -= info - (char *)modinfo; | |
694 | modinfo = next_string(info, &size); | |
695 | } | |
696 | ||
1da177e4 LT |
697 | for (p = modinfo; p; p = next_string(p, &size)) { |
698 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
699 | return p + taglen + 1; | |
700 | } | |
701 | return NULL; | |
702 | } | |
703 | ||
b817f6fe SR |
704 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
705 | const char *tag) | |
706 | ||
707 | { | |
708 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
709 | } | |
710 | ||
4c8fbca5 SR |
711 | /** |
712 | * Test if string s ends in string sub | |
713 | * return 0 if match | |
714 | **/ | |
715 | static int strrcmp(const char *s, const char *sub) | |
716 | { | |
df578e7d | 717 | int slen, sublen; |
62070fa4 | 718 | |
4c8fbca5 SR |
719 | if (!s || !sub) |
720 | return 1; | |
62070fa4 | 721 | |
4c8fbca5 | 722 | slen = strlen(s); |
df578e7d | 723 | sublen = strlen(sub); |
62070fa4 | 724 | |
4c8fbca5 SR |
725 | if ((slen == 0) || (sublen == 0)) |
726 | return 1; | |
727 | ||
df578e7d SR |
728 | if (sublen > slen) |
729 | return 1; | |
4c8fbca5 | 730 | |
df578e7d | 731 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
732 | } |
733 | ||
ff13f926 SR |
734 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
735 | { | |
58fb0d4f SR |
736 | if (sym) |
737 | return elf->strtab + sym->st_name; | |
738 | else | |
f666751a | 739 | return "(unknown)"; |
ff13f926 SR |
740 | } |
741 | ||
1ce53adf | 742 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
743 | { |
744 | Elf_Shdr *sechdrs = elf->sechdrs; | |
745 | return (void *)elf->hdr + | |
1ce53adf DV |
746 | elf->sechdrs[elf->secindex_strings].sh_offset + |
747 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
748 | } |
749 | ||
750 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
751 | { | |
752 | return (void *)elf->hdr + | |
1ce53adf DV |
753 | elf->sechdrs[elf->secindex_strings].sh_offset + |
754 | sechdr->sh_name; | |
ff13f926 SR |
755 | } |
756 | ||
10668220 SR |
757 | /* if sym is empty or point to a string |
758 | * like ".[0-9]+" then return 1. | |
759 | * This is the optional prefix added by ld to some sections | |
760 | */ | |
761 | static int number_prefix(const char *sym) | |
762 | { | |
763 | if (*sym++ == '\0') | |
764 | return 1; | |
765 | if (*sym != '.') | |
766 | return 0; | |
767 | do { | |
768 | char c = *sym++; | |
769 | if (c < '0' || c > '9') | |
770 | return 0; | |
771 | } while (*sym); | |
772 | return 1; | |
773 | } | |
774 | ||
775 | /* The pattern is an array of simple patterns. | |
776 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 777 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
778 | * "foo*" will match a string that begins with "foo" |
779 | * "foo$" will match a string equal to "foo" or "foo.1" | |
780 | * where the '1' can be any number including several digits. | |
781 | * The $ syntax is for sections where ld append a dot number | |
782 | * to make section name unique. | |
783 | */ | |
5c725138 | 784 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
785 | { |
786 | const char *p; | |
787 | while (*pat) { | |
788 | p = *pat++; | |
789 | const char *endp = p + strlen(p) - 1; | |
790 | ||
6c5bd235 SR |
791 | /* "*foo" */ |
792 | if (*p == '*') { | |
793 | if (strrcmp(sym, p + 1) == 0) | |
794 | return 1; | |
795 | } | |
10668220 | 796 | /* "foo*" */ |
6c5bd235 | 797 | else if (*endp == '*') { |
10668220 SR |
798 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
799 | return 1; | |
800 | } | |
801 | /* "foo$" */ | |
802 | else if (*endp == '$') { | |
803 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
804 | if (number_prefix(sym + strlen(p) - 1)) | |
805 | return 1; | |
806 | } | |
807 | } | |
808 | /* no wildcards */ | |
809 | else { | |
810 | if (strcmp(p, sym) == 0) | |
811 | return 1; | |
812 | } | |
813 | } | |
814 | /* no match */ | |
815 | return 0; | |
816 | } | |
817 | ||
10668220 SR |
818 | /* sections that we do not want to do full section mismatch check on */ |
819 | static const char *section_white_list[] = | |
4391ed6a SR |
820 | { |
821 | ".comment*", | |
822 | ".debug*", | |
1121584f | 823 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 824 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 825 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
826 | ".mdebug*", /* alpha, score, mips etc. */ |
827 | ".pdr", /* alpha, score, mips etc. */ | |
828 | ".stab*", | |
829 | ".note*", | |
830 | ".got*", | |
831 | ".toc*", | |
af42e970 MF |
832 | ".xt.prop", /* xtensa */ |
833 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
834 | ".arcextmap*", /* arc */ |
835 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
4391ed6a SR |
836 | NULL |
837 | }; | |
10668220 | 838 | |
e241a630 | 839 | /* |
b614a697 | 840 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 841 | * The cause of this is often a section specified in assembler |
b614a697 | 842 | * without "ax" / "aw". |
e241a630 | 843 | */ |
b614a697 AK |
844 | static void check_section(const char *modname, struct elf_info *elf, |
845 | Elf_Shdr *sechdr) | |
e241a630 | 846 | { |
b614a697 AK |
847 | const char *sec = sech_name(elf, sechdr); |
848 | ||
849 | if (sechdr->sh_type == SHT_PROGBITS && | |
850 | !(sechdr->sh_flags & SHF_ALLOC) && | |
851 | !match(sec, section_white_list)) { | |
852 | warn("%s (%s): unexpected non-allocatable section.\n" | |
853 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
854 | "Note that for example <linux/init.h> contains\n" | |
855 | "section definitions for use in .S files.\n\n", | |
856 | modname, sec); | |
e241a630 | 857 | } |
e241a630 SR |
858 | } |
859 | ||
860 | ||
861 | ||
eb8f6890 | 862 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d | 863 | ".init.setup$", ".init.rodata$", \ |
92e9e6d1 GKH |
864 | ".cpuinit.rodata$", ".meminit.rodata$", \ |
865 | ".init.data$", ".cpuinit.data$", ".meminit.data$" | |
eb8f6890 | 866 | #define ALL_EXIT_DATA_SECTIONS \ |
92e9e6d1 | 867 | ".exit.data$", ".cpuexit.data$", ".memexit.data$" |
10668220 | 868 | |
eb8f6890 | 869 | #define ALL_INIT_TEXT_SECTIONS \ |
92e9e6d1 | 870 | ".init.text$", ".cpuinit.text$", ".meminit.text$" |
eb8f6890 | 871 | #define ALL_EXIT_TEXT_SECTIONS \ |
92e9e6d1 | 872 | ".exit.text$", ".cpuexit.text$", ".memexit.text$" |
10668220 | 873 | |
bb15d8db SAS |
874 | #define ALL_PCI_INIT_SECTIONS \ |
875 | ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \ | |
876 | ".pci_fixup_enable$", ".pci_fixup_resume$", \ | |
877 | ".pci_fixup_resume_early$", ".pci_fixup_suspend$" | |
878 | ||
92e9e6d1 GKH |
879 | #define ALL_XXXINIT_SECTIONS CPU_INIT_SECTIONS, MEM_INIT_SECTIONS |
880 | #define ALL_XXXEXIT_SECTIONS CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS | |
4a31a229 UKK |
881 | |
882 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
883 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 884 | |
6c5bd235 | 885 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
886 | #define TEXT_SECTIONS ".text$" |
887 | ||
fd6c3a8d | 888 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d JB |
889 | #define CPU_INIT_SECTIONS ".cpuinit.*" |
890 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 891 | |
fd6c3a8d | 892 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d JB |
893 | #define CPU_EXIT_SECTIONS ".cpuexit.*" |
894 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 895 | |
6c5bd235 | 896 | /* init data sections */ |
eb8f6890 | 897 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
898 | |
899 | /* all init sections */ | |
eb8f6890 | 900 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
901 | |
902 | /* All init and exit sections (code + data) */ | |
903 | static const char *init_exit_sections[] = | |
eb8f6890 | 904 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
905 | |
906 | /* data section */ | |
907 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
908 | ||
6c5bd235 SR |
909 | |
910 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
911 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
912 | "*driver", \ | |
913 | "*_template", /* scsi uses *_template a lot */ \ | |
914 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
915 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
916 | "*_ops", \ | |
917 | "*_probe", \ | |
918 | "*_probe_one", \ | |
919 | "*_console" | |
6c5bd235 SR |
920 | |
921 | static const char *head_sections[] = { ".head.text*", NULL }; | |
922 | static const char *linker_symbols[] = | |
923 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
924 | ||
588ccd73 | 925 | enum mismatch { |
bbd3f4fb UKK |
926 | TEXT_TO_ANY_INIT, |
927 | DATA_TO_ANY_INIT, | |
928 | TEXT_TO_ANY_EXIT, | |
929 | DATA_TO_ANY_EXIT, | |
930 | XXXINIT_TO_SOME_INIT, | |
931 | XXXEXIT_TO_SOME_EXIT, | |
932 | ANY_INIT_TO_ANY_EXIT, | |
933 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
934 | EXPORT_TO_INIT_EXIT, |
935 | }; | |
936 | ||
10668220 SR |
937 | struct sectioncheck { |
938 | const char *fromsec[20]; | |
939 | const char *tosec[20]; | |
588ccd73 | 940 | enum mismatch mismatch; |
af92a82d | 941 | const char *symbol_white_list[20]; |
10668220 SR |
942 | }; |
943 | ||
944 | const struct sectioncheck sectioncheck[] = { | |
945 | /* Do not reference init/exit code/data from | |
946 | * normal code and data | |
947 | */ | |
948 | { | |
588ccd73 SR |
949 | .fromsec = { TEXT_SECTIONS, NULL }, |
950 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 951 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 952 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
953 | }, |
954 | { | |
955 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 956 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 957 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 958 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 959 | }, |
0db25245 UKK |
960 | { |
961 | .fromsec = { DATA_SECTIONS, NULL }, | |
962 | .tosec = { INIT_SECTIONS, NULL }, | |
963 | .mismatch = DATA_TO_ANY_INIT, | |
964 | .symbol_white_list = { | |
965 | "*_template", "*_timer", "*_sht", "*_ops", | |
966 | "*_probe", "*_probe_one", "*_console", NULL | |
967 | }, | |
968 | }, | |
588ccd73 SR |
969 | { |
970 | .fromsec = { TEXT_SECTIONS, NULL }, | |
971 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 972 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 973 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
974 | }, |
975 | { | |
976 | .fromsec = { DATA_SECTIONS, NULL }, | |
977 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 978 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 979 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 980 | }, |
92e9e6d1 | 981 | /* Do not reference init code/data from cpuinit/meminit code/data */ |
eb8f6890 | 982 | { |
4a31a229 | 983 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 984 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 985 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 986 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 987 | }, |
fd6c3a8d JB |
988 | /* Do not reference cpuinit code/data from meminit code/data */ |
989 | { | |
990 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
991 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 992 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 993 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
994 | }, |
995 | /* Do not reference meminit code/data from cpuinit code/data */ | |
996 | { | |
997 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
998 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 999 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 1000 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 1001 | }, |
92e9e6d1 | 1002 | /* Do not reference exit code/data from cpuexit/memexit code/data */ |
eb8f6890 | 1003 | { |
4a31a229 | 1004 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 1005 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 1006 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1007 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1008 | }, |
fd6c3a8d JB |
1009 | /* Do not reference cpuexit code/data from memexit code/data */ |
1010 | { | |
1011 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
1012 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1013 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1014 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
1015 | }, |
1016 | /* Do not reference memexit code/data from cpuexit code/data */ | |
1017 | { | |
1018 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
1019 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1020 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 1021 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 1022 | }, |
10668220 SR |
1023 | /* Do not use exit code/data from init code */ |
1024 | { | |
eb8f6890 SR |
1025 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
1026 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 1027 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 1028 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
1029 | }, |
1030 | /* Do not use init code/data from exit code */ | |
1031 | { | |
eb8f6890 | 1032 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 1033 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1034 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1035 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1036 | }, |
bb15d8db SAS |
1037 | { |
1038 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
1039 | .tosec = { INIT_SECTIONS, NULL }, | |
1040 | .mismatch = ANY_INIT_TO_ANY_EXIT, | |
1041 | .symbol_white_list = { NULL }, | |
1042 | }, | |
10668220 SR |
1043 | /* Do not export init/exit functions or data */ |
1044 | { | |
1045 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1046 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1047 | .mismatch = EXPORT_TO_INIT_EXIT, |
1048 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1049 | } |
1050 | }; | |
1051 | ||
0d2a636e UKK |
1052 | static const struct sectioncheck *section_mismatch( |
1053 | const char *fromsec, const char *tosec) | |
10668220 SR |
1054 | { |
1055 | int i; | |
1056 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1057 | const struct sectioncheck *check = §ioncheck[0]; | |
1058 | ||
1059 | for (i = 0; i < elems; i++) { | |
1060 | if (match(fromsec, check->fromsec) && | |
1061 | match(tosec, check->tosec)) | |
0d2a636e | 1062 | return check; |
10668220 SR |
1063 | check++; |
1064 | } | |
0d2a636e | 1065 | return NULL; |
10668220 SR |
1066 | } |
1067 | ||
4c8fbca5 SR |
1068 | /** |
1069 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1070 | * |
4c8fbca5 SR |
1071 | * Pattern 1: |
1072 | * If a module parameter is declared __initdata and permissions=0 | |
1073 | * then this is legal despite the warning generated. | |
1074 | * We cannot see value of permissions here, so just ignore | |
1075 | * this pattern. | |
1076 | * The pattern is identified by: | |
1077 | * tosec = .init.data | |
9209aed0 | 1078 | * fromsec = .data* |
4c8fbca5 | 1079 | * atsym =__param* |
62070fa4 | 1080 | * |
6a841528 RR |
1081 | * Pattern 1a: |
1082 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1083 | * The pattern is identified by: | |
1084 | * tosec = .init.text | |
1085 | * fromsec = .data* | |
1086 | * atsym = __param_ops_* | |
1087 | * | |
4c8fbca5 | 1088 | * Pattern 2: |
72ee59b5 | 1089 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1090 | * add, remove, probe functions etc. |
92e9e6d1 | 1091 | * These functions may often be marked __cpuinit and we do not want to |
4c8fbca5 SR |
1092 | * warn here. |
1093 | * the pattern is identified by: | |
83cda2bb SR |
1094 | * tosec = init or exit section |
1095 | * fromsec = data section | |
df578e7d SR |
1096 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1097 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1098 | * |
1099 | * Pattern 3: | |
c993971f | 1100 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1101 | * |
1d8af559 | 1102 | * Pattern 4: |
ee6a8545 VG |
1103 | * Some symbols belong to init section but still it is ok to reference |
1104 | * these from non-init sections as these symbols don't have any memory | |
1105 | * allocated for them and symbol address and value are same. So even | |
1106 | * if init section is freed, its ok to reference those symbols. | |
1107 | * For ex. symbols marking the init section boundaries. | |
1108 | * This pattern is identified by | |
1109 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1110 | * |
4c8fbca5 | 1111 | **/ |
af92a82d UKK |
1112 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1113 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1114 | const char *tosec, const char *tosym) |
4c8fbca5 | 1115 | { |
4c8fbca5 | 1116 | /* Check for pattern 1 */ |
6c5bd235 SR |
1117 | if (match(tosec, init_data_sections) && |
1118 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1119 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1120 | return 0; | |
4c8fbca5 | 1121 | |
6a841528 RR |
1122 | /* Check for pattern 1a */ |
1123 | if (strcmp(tosec, ".init.text") == 0 && | |
1124 | match(fromsec, data_sections) && | |
1125 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1126 | return 0; | |
1127 | ||
4c8fbca5 | 1128 | /* Check for pattern 2 */ |
6c5bd235 SR |
1129 | if (match(tosec, init_exit_sections) && |
1130 | match(fromsec, data_sections) && | |
af92a82d | 1131 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1132 | return 0; |
4c8fbca5 | 1133 | |
9bf8cb9b | 1134 | /* Check for pattern 3 */ |
6c5bd235 SR |
1135 | if (match(fromsec, head_sections) && |
1136 | match(tosec, init_sections)) | |
58fb0d4f | 1137 | return 0; |
9bf8cb9b | 1138 | |
1d8af559 | 1139 | /* Check for pattern 4 */ |
58fb0d4f SR |
1140 | if (match(tosym, linker_symbols)) |
1141 | return 0; | |
9bf8cb9b | 1142 | |
58fb0d4f | 1143 | return 1; |
4c8fbca5 SR |
1144 | } |
1145 | ||
93684d3b SR |
1146 | /** |
1147 | * Find symbol based on relocation record info. | |
1148 | * In some cases the symbol supplied is a valid symbol so | |
1149 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1150 | * In other cases the symbol needs to be looked up in the symbol table | |
1151 | * based on section and address. | |
1152 | * **/ | |
9ad21c3f | 1153 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1154 | Elf_Sym *relsym) |
1155 | { | |
1156 | Elf_Sym *sym; | |
9ad21c3f SR |
1157 | Elf_Sym *near = NULL; |
1158 | Elf64_Sword distance = 20; | |
1159 | Elf64_Sword d; | |
1ce53adf | 1160 | unsigned int relsym_secindex; |
93684d3b SR |
1161 | |
1162 | if (relsym->st_name != 0) | |
1163 | return relsym; | |
1ce53adf DV |
1164 | |
1165 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1166 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1167 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1168 | continue; |
ae4ac123 AN |
1169 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1170 | continue; | |
93684d3b SR |
1171 | if (sym->st_value == addr) |
1172 | return sym; | |
9ad21c3f SR |
1173 | /* Find a symbol nearby - addr are maybe negative */ |
1174 | d = sym->st_value - addr; | |
1175 | if (d < 0) | |
1176 | d = addr - sym->st_value; | |
1177 | if (d < distance) { | |
1178 | distance = d; | |
1179 | near = sym; | |
1180 | } | |
93684d3b | 1181 | } |
9ad21c3f SR |
1182 | /* We need a close match */ |
1183 | if (distance < 20) | |
1184 | return near; | |
1185 | else | |
1186 | return NULL; | |
93684d3b SR |
1187 | } |
1188 | ||
da68d61f DB |
1189 | static inline int is_arm_mapping_symbol(const char *str) |
1190 | { | |
1191 | return str[0] == '$' && strchr("atd", str[1]) | |
1192 | && (str[2] == '\0' || str[2] == '.'); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1197 | * one of the magic symbols emitted used by current ARM tools. | |
1198 | * | |
1199 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1200 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1201 | * only by merging __exit and __init sections into __text, bloating | |
1202 | * the kernel (which is especially evil on embedded platforms). | |
1203 | */ | |
1204 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1205 | { | |
1206 | const char *name = elf->strtab + sym->st_name; | |
1207 | ||
1208 | if (!name || !strlen(name)) | |
1209 | return 0; | |
1210 | return !is_arm_mapping_symbol(name); | |
1211 | } | |
1212 | ||
b39927cf | 1213 | /* |
43c74d17 SR |
1214 | * Find symbols before or equal addr and after addr - in the section sec. |
1215 | * If we find two symbols with equal offset prefer one with a valid name. | |
1216 | * The ELF format may have a better way to detect what type of symbol | |
1217 | * it is, but this works for now. | |
b39927cf | 1218 | **/ |
157c23c8 SR |
1219 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1220 | const char *sec) | |
b39927cf SR |
1221 | { |
1222 | Elf_Sym *sym; | |
157c23c8 | 1223 | Elf_Sym *near = NULL; |
157c23c8 | 1224 | Elf_Addr distance = ~0; |
62070fa4 | 1225 | |
b39927cf SR |
1226 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1227 | const char *symsec; | |
1228 | ||
1ce53adf | 1229 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1230 | continue; |
1ce53adf | 1231 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1232 | if (strcmp(symsec, sec) != 0) |
1233 | continue; | |
da68d61f DB |
1234 | if (!is_valid_name(elf, sym)) |
1235 | continue; | |
b39927cf | 1236 | if (sym->st_value <= addr) { |
157c23c8 SR |
1237 | if ((addr - sym->st_value) < distance) { |
1238 | distance = addr - sym->st_value; | |
1239 | near = sym; | |
1240 | } else if ((addr - sym->st_value) == distance) { | |
1241 | near = sym; | |
43c74d17 | 1242 | } |
b39927cf SR |
1243 | } |
1244 | } | |
157c23c8 | 1245 | return near; |
b39927cf SR |
1246 | } |
1247 | ||
588ccd73 SR |
1248 | /* |
1249 | * Convert a section name to the function/data attribute | |
1250 | * .init.text => __init | |
1251 | * .cpuinit.data => __cpudata | |
1252 | * .memexitconst => __memconst | |
1253 | * etc. | |
cbcf14a9 AS |
1254 | * |
1255 | * The memory of returned value has been allocated on a heap. The user of this | |
1256 | * method should free it after usage. | |
588ccd73 SR |
1257 | */ |
1258 | static char *sec2annotation(const char *s) | |
1259 | { | |
1260 | if (match(s, init_exit_sections)) { | |
1261 | char *p = malloc(20); | |
1262 | char *r = p; | |
1263 | ||
1264 | *p++ = '_'; | |
1265 | *p++ = '_'; | |
1266 | if (*s == '.') | |
1267 | s++; | |
1268 | while (*s && *s != '.') | |
1269 | *p++ = *s++; | |
1270 | *p = '\0'; | |
1271 | if (*s == '.') | |
1272 | s++; | |
1273 | if (strstr(s, "rodata") != NULL) | |
1274 | strcat(p, "const "); | |
1275 | else if (strstr(s, "data") != NULL) | |
1276 | strcat(p, "data "); | |
1277 | else | |
1278 | strcat(p, " "); | |
cbcf14a9 | 1279 | return r; |
588ccd73 | 1280 | } else { |
5003bab8 | 1281 | return strdup(""); |
588ccd73 SR |
1282 | } |
1283 | } | |
1284 | ||
1285 | static int is_function(Elf_Sym *sym) | |
1286 | { | |
1287 | if (sym) | |
1288 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1289 | else | |
f666751a | 1290 | return -1; |
588ccd73 SR |
1291 | } |
1292 | ||
00759c0e RD |
1293 | static void print_section_list(const char * const list[20]) |
1294 | { | |
1295 | const char *const *s = list; | |
1296 | ||
1297 | while (*s) { | |
1298 | fprintf(stderr, "%s", *s); | |
1299 | s++; | |
1300 | if (*s) | |
1301 | fprintf(stderr, ", "); | |
1302 | } | |
1303 | fprintf(stderr, "\n"); | |
1304 | } | |
1305 | ||
58fb0d4f | 1306 | /* |
b39927cf SR |
1307 | * Print a warning about a section mismatch. |
1308 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1309 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1310 | */ |
0d2a636e UKK |
1311 | static void report_sec_mismatch(const char *modname, |
1312 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1313 | const char *fromsec, |
1314 | unsigned long long fromaddr, | |
1315 | const char *fromsym, | |
588ccd73 SR |
1316 | int from_is_func, |
1317 | const char *tosec, const char *tosym, | |
1318 | int to_is_func) | |
1319 | { | |
1320 | const char *from, *from_p; | |
1321 | const char *to, *to_p; | |
37ed19d5 AF |
1322 | char *prl_from; |
1323 | char *prl_to; | |
f666751a SR |
1324 | |
1325 | switch (from_is_func) { | |
1326 | case 0: from = "variable"; from_p = ""; break; | |
1327 | case 1: from = "function"; from_p = "()"; break; | |
1328 | default: from = "(unknown reference)"; from_p = ""; break; | |
1329 | } | |
1330 | switch (to_is_func) { | |
1331 | case 0: to = "variable"; to_p = ""; break; | |
1332 | case 1: to = "function"; to_p = "()"; break; | |
1333 | default: to = "(unknown reference)"; to_p = ""; break; | |
1334 | } | |
588ccd73 | 1335 | |
e5f95c8b SR |
1336 | sec_mismatch_count++; |
1337 | if (!sec_mismatch_verbose) | |
1338 | return; | |
1339 | ||
7c0ac495 GU |
1340 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1341 | "to the %s %s:%s%s\n", | |
1342 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1343 | tosym, to_p); | |
588ccd73 | 1344 | |
0d2a636e | 1345 | switch (mismatch->mismatch) { |
bbd3f4fb | 1346 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1347 | prl_from = sec2annotation(fromsec); |
1348 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1349 | fprintf(stderr, |
f666751a | 1350 | "The function %s%s() references\n" |
588ccd73 SR |
1351 | "the %s %s%s%s.\n" |
1352 | "This is often because %s lacks a %s\n" | |
1353 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1354 | prl_from, fromsym, |
1355 | to, prl_to, tosym, to_p, | |
1356 | fromsym, prl_to, tosym); | |
1357 | free(prl_from); | |
1358 | free(prl_to); | |
588ccd73 | 1359 | break; |
bbd3f4fb | 1360 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1361 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1362 | fprintf(stderr, |
1363 | "The variable %s references\n" | |
1364 | "the %s %s%s%s\n" | |
1365 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1366 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1367 | "or name the variable:\n", |
37ed19d5 | 1368 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1369 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1370 | free(prl_to); |
588ccd73 | 1371 | break; |
58fb0d4f | 1372 | } |
bbd3f4fb | 1373 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1374 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1375 | fprintf(stderr, |
1376 | "The function %s() references a %s in an exit section.\n" | |
1377 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1378 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1379 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1380 | free(prl_to); | |
588ccd73 | 1381 | break; |
bbd3f4fb | 1382 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1383 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1384 | fprintf(stderr, |
1385 | "The variable %s references\n" | |
1386 | "the %s %s%s%s\n" | |
1387 | "If the reference is valid then annotate the\n" | |
1388 | "variable with __exit* (see linux/init.h) or " | |
1389 | "name the variable:\n", | |
37ed19d5 | 1390 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1391 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1392 | free(prl_to); |
588ccd73 SR |
1393 | break; |
1394 | } | |
bbd3f4fb UKK |
1395 | case XXXINIT_TO_SOME_INIT: |
1396 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1397 | prl_from = sec2annotation(fromsec); |
1398 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1399 | fprintf(stderr, |
1400 | "The %s %s%s%s references\n" | |
1401 | "a %s %s%s%s.\n" | |
1402 | "If %s is only used by %s then\n" | |
1403 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1404 | from, prl_from, fromsym, from_p, |
1405 | to, prl_to, tosym, to_p, | |
b1d2675a | 1406 | tosym, fromsym, tosym); |
37ed19d5 AF |
1407 | free(prl_from); |
1408 | free(prl_to); | |
588ccd73 | 1409 | break; |
bbd3f4fb | 1410 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1411 | prl_from = sec2annotation(fromsec); |
1412 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1413 | fprintf(stderr, |
1414 | "The %s %s%s%s references\n" | |
1415 | "a %s %s%s%s.\n" | |
1416 | "This is often seen when error handling " | |
1417 | "in the init function\n" | |
1418 | "uses functionality in the exit path.\n" | |
1419 | "The fix is often to remove the %sannotation of\n" | |
1420 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1421 | from, prl_from, fromsym, from_p, |
1422 | to, prl_to, tosym, to_p, | |
5003bab8 | 1423 | prl_to, tosym, to_p); |
37ed19d5 AF |
1424 | free(prl_from); |
1425 | free(prl_to); | |
588ccd73 | 1426 | break; |
bbd3f4fb | 1427 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1428 | prl_from = sec2annotation(fromsec); |
1429 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1430 | fprintf(stderr, |
1431 | "The %s %s%s%s references\n" | |
1432 | "a %s %s%s%s.\n" | |
1433 | "This is often seen when error handling " | |
1434 | "in the exit function\n" | |
1435 | "uses functionality in the init path.\n" | |
1436 | "The fix is often to remove the %sannotation of\n" | |
1437 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1438 | from, prl_from, fromsym, from_p, |
1439 | to, prl_to, tosym, to_p, | |
1440 | prl_to, tosym, to_p); | |
1441 | free(prl_from); | |
1442 | free(prl_to); | |
588ccd73 SR |
1443 | break; |
1444 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1445 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1446 | fprintf(stderr, |
1447 | "The symbol %s is exported and annotated %s\n" | |
1448 | "Fix this by removing the %sannotation of %s " | |
1449 | "or drop the export.\n", | |
37ed19d5 AF |
1450 | tosym, prl_to, prl_to, tosym); |
1451 | free(prl_to); | |
588ccd73 SR |
1452 | break; |
1453 | } | |
1454 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1455 | } |
1456 | ||
1457 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1458 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1459 | { | |
1460 | const char *tosec; | |
0d2a636e | 1461 | const struct sectioncheck *mismatch; |
58fb0d4f | 1462 | |
1ce53adf | 1463 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1464 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1465 | if (mismatch) { |
588ccd73 SR |
1466 | Elf_Sym *to; |
1467 | Elf_Sym *from; | |
58fb0d4f | 1468 | const char *tosym; |
588ccd73 | 1469 | const char *fromsym; |
58fb0d4f | 1470 | |
588ccd73 SR |
1471 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1472 | fromsym = sym_name(elf, from); | |
1473 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1474 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1475 | |
1476 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1477 | if (secref_whitelist(mismatch, |
1478 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1479 | report_sec_mismatch(modname, mismatch, |
1480 | fromsec, r->r_offset, fromsym, | |
1481 | is_function(from), tosec, tosym, | |
1482 | is_function(to)); | |
58fb0d4f | 1483 | } |
b39927cf SR |
1484 | } |
1485 | } | |
1486 | ||
ae4ac123 | 1487 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1488 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1489 | { |
1490 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1491 | int section = sechdr->sh_info; |
ae4ac123 AN |
1492 | |
1493 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1494 | r->r_offset; |
ae4ac123 AN |
1495 | } |
1496 | ||
5b24c071 | 1497 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1498 | { |
1499 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1500 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1501 | |
1502 | switch (r_typ) { | |
1503 | case R_386_32: | |
1504 | r->r_addend = TO_NATIVE(*location); | |
1505 | break; | |
1506 | case R_386_PC32: | |
1507 | r->r_addend = TO_NATIVE(*location) + 4; | |
1508 | /* For CONFIG_RELOCATABLE=y */ | |
1509 | if (elf->hdr->e_type == ET_EXEC) | |
1510 | r->r_addend += r->r_offset; | |
1511 | break; | |
1512 | } | |
1513 | return 0; | |
1514 | } | |
1515 | ||
6e2e340b TL |
1516 | #ifndef R_ARM_CALL |
1517 | #define R_ARM_CALL 28 | |
1518 | #endif | |
1519 | #ifndef R_ARM_JUMP24 | |
1520 | #define R_ARM_JUMP24 29 | |
1521 | #endif | |
1522 | ||
5b24c071 | 1523 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1524 | { |
1525 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1526 | ||
1527 | switch (r_typ) { | |
1528 | case R_ARM_ABS32: | |
1529 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1530 | r->r_addend = (int)(long) |
1531 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1532 | break; |
1533 | case R_ARM_PC24: | |
6e2e340b TL |
1534 | case R_ARM_CALL: |
1535 | case R_ARM_JUMP24: | |
56a974fa | 1536 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1537 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1538 | sechdr->sh_offset + |
1539 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1540 | break; |
1541 | default: | |
1542 | return 1; | |
1543 | } | |
1544 | return 0; | |
1545 | } | |
1546 | ||
5b24c071 | 1547 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1548 | { |
1549 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1550 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1551 | unsigned int inst; |
1552 | ||
1553 | if (r_typ == R_MIPS_HI16) | |
1554 | return 1; /* skip this */ | |
1555 | inst = TO_NATIVE(*location); | |
1556 | switch (r_typ) { | |
1557 | case R_MIPS_LO16: | |
1558 | r->r_addend = inst & 0xffff; | |
1559 | break; | |
1560 | case R_MIPS_26: | |
1561 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1562 | break; | |
1563 | case R_MIPS_32: | |
1564 | r->r_addend = inst; | |
1565 | break; | |
1566 | } | |
1567 | return 0; | |
1568 | } | |
1569 | ||
5b24c071 | 1570 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1571 | Elf_Shdr *sechdr) |
5b24c071 SR |
1572 | { |
1573 | Elf_Sym *sym; | |
1574 | Elf_Rela *rela; | |
1575 | Elf_Rela r; | |
1576 | unsigned int r_sym; | |
1577 | const char *fromsec; | |
5b24c071 | 1578 | |
ff13f926 | 1579 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1580 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1581 | ||
ff13f926 | 1582 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1583 | fromsec += strlen(".rela"); |
1584 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1585 | if (match(fromsec, section_white_list)) |
5b24c071 | 1586 | return; |
e241a630 | 1587 | |
5b24c071 SR |
1588 | for (rela = start; rela < stop; rela++) { |
1589 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1590 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1591 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1592 | unsigned int r_typ; |
1593 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1594 | r_sym = TO_NATIVE(r_sym); | |
1595 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1596 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1597 | } else { | |
1598 | r.r_info = TO_NATIVE(rela->r_info); | |
1599 | r_sym = ELF_R_SYM(r.r_info); | |
1600 | } | |
1601 | #else | |
1602 | r.r_info = TO_NATIVE(rela->r_info); | |
1603 | r_sym = ELF_R_SYM(r.r_info); | |
1604 | #endif | |
1605 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1606 | sym = elf->symtab_start + r_sym; | |
1607 | /* Skip special sections */ | |
1ce53adf | 1608 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1609 | continue; |
58fb0d4f | 1610 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1611 | } |
1612 | } | |
1613 | ||
1614 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1615 | Elf_Shdr *sechdr) |
5b24c071 SR |
1616 | { |
1617 | Elf_Sym *sym; | |
1618 | Elf_Rel *rel; | |
1619 | Elf_Rela r; | |
1620 | unsigned int r_sym; | |
1621 | const char *fromsec; | |
5b24c071 | 1622 | |
ff13f926 | 1623 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1624 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1625 | ||
ff13f926 | 1626 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1627 | fromsec += strlen(".rel"); |
1628 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1629 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1630 | return; |
1631 | ||
1632 | for (rel = start; rel < stop; rel++) { | |
1633 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1634 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1635 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1636 | unsigned int r_typ; |
1637 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1638 | r_sym = TO_NATIVE(r_sym); | |
1639 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1640 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1641 | } else { | |
1642 | r.r_info = TO_NATIVE(rel->r_info); | |
1643 | r_sym = ELF_R_SYM(r.r_info); | |
1644 | } | |
1645 | #else | |
1646 | r.r_info = TO_NATIVE(rel->r_info); | |
1647 | r_sym = ELF_R_SYM(r.r_info); | |
1648 | #endif | |
1649 | r.r_addend = 0; | |
ff13f926 | 1650 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1651 | case EM_386: |
1652 | if (addend_386_rel(elf, sechdr, &r)) | |
1653 | continue; | |
1654 | break; | |
1655 | case EM_ARM: | |
1656 | if (addend_arm_rel(elf, sechdr, &r)) | |
1657 | continue; | |
1658 | break; | |
1659 | case EM_MIPS: | |
1660 | if (addend_mips_rel(elf, sechdr, &r)) | |
1661 | continue; | |
1662 | break; | |
1663 | } | |
1664 | sym = elf->symtab_start + r_sym; | |
1665 | /* Skip special sections */ | |
1ce53adf | 1666 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1667 | continue; |
58fb0d4f | 1668 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1669 | } |
1670 | } | |
1671 | ||
b39927cf SR |
1672 | /** |
1673 | * A module includes a number of sections that are discarded | |
1674 | * either when loaded or when used as built-in. | |
1675 | * For loaded modules all functions marked __init and all data | |
b595076a | 1676 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1677 | * Likewise for modules used built-in the sections marked __exit |
1678 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1679 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1680 | * The check_sec_ref() function traverses all relocation records |
1681 | * to find all references to a section that reference a section that will | |
1682 | * be discarded and warns about it. | |
1683 | **/ | |
1684 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1685 | struct elf_info *elf) |
b39927cf SR |
1686 | { |
1687 | int i; | |
b39927cf | 1688 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1689 | |
b39927cf | 1690 | /* Walk through all sections */ |
1ce53adf | 1691 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1692 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1693 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1694 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1695 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1696 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1697 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1698 | } |
1699 | } | |
1700 | ||
5c3ead8c | 1701 | static void read_symbols(char *modname) |
1da177e4 LT |
1702 | { |
1703 | const char *symname; | |
1704 | char *version; | |
b817f6fe | 1705 | char *license; |
1da177e4 LT |
1706 | struct module *mod; |
1707 | struct elf_info info = { }; | |
1708 | Elf_Sym *sym; | |
1709 | ||
85bd2fdd SR |
1710 | if (!parse_elf(&info, modname)) |
1711 | return; | |
1da177e4 LT |
1712 | |
1713 | mod = new_module(modname); | |
1714 | ||
1715 | /* When there's no vmlinux, don't print warnings about | |
1716 | * unresolved symbols (since there'll be too many ;) */ | |
1717 | if (is_vmlinux(modname)) { | |
1da177e4 | 1718 | have_vmlinux = 1; |
1da177e4 LT |
1719 | mod->skip = 1; |
1720 | } | |
1721 | ||
b817f6fe | 1722 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1723 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1724 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1725 | "see include/linux/module.h for " | |
1726 | "more information\n", modname); | |
b817f6fe SR |
1727 | while (license) { |
1728 | if (license_is_gpl_compatible(license)) | |
1729 | mod->gpl_compatible = 1; | |
1730 | else { | |
1731 | mod->gpl_compatible = 0; | |
1732 | break; | |
1733 | } | |
1734 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1735 | "license", license); | |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1739 | symname = info.strtab + sym->st_name; | |
1740 | ||
1741 | handle_modversions(mod, &info, sym, symname); | |
1742 | handle_moddevtable(mod, &info, sym, symname); | |
1743 | } | |
d1f25e66 | 1744 | if (!is_vmlinux(modname) || |
10668220 SR |
1745 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1746 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1747 | |
1748 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1749 | if (version) | |
1750 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1751 | version - (char *)info.hdr); | |
1752 | if (version || (all_versions && !is_vmlinux(modname))) | |
1753 | get_src_version(modname, mod->srcversion, | |
1754 | sizeof(mod->srcversion)-1); | |
1755 | ||
1756 | parse_elf_finish(&info); | |
1757 | ||
8c8ef42a | 1758 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1759 | * never passed as an argument to an exported function, so |
1760 | * the automatic versioning doesn't pick it up, but it's really | |
1761 | * important anyhow */ | |
1762 | if (modversions) | |
8c8ef42a | 1763 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1764 | } |
1765 | ||
1766 | #define SZ 500 | |
1767 | ||
1768 | /* We first write the generated file into memory using the | |
1769 | * following helper, then compare to the file on disk and | |
1770 | * only update the later if anything changed */ | |
1771 | ||
5c3ead8c SR |
1772 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1773 | const char *fmt, ...) | |
1da177e4 LT |
1774 | { |
1775 | char tmp[SZ]; | |
1776 | int len; | |
1777 | va_list ap; | |
62070fa4 | 1778 | |
1da177e4 LT |
1779 | va_start(ap, fmt); |
1780 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1781 | buf_write(buf, tmp, len); |
1da177e4 LT |
1782 | va_end(ap); |
1783 | } | |
1784 | ||
5c3ead8c | 1785 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1786 | { |
1787 | if (buf->size - buf->pos < len) { | |
7670f023 | 1788 | buf->size += len + SZ; |
1da177e4 LT |
1789 | buf->p = realloc(buf->p, buf->size); |
1790 | } | |
1791 | strncpy(buf->p + buf->pos, s, len); | |
1792 | buf->pos += len; | |
1793 | } | |
1794 | ||
c96fca21 SR |
1795 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1796 | { | |
1797 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1798 | ||
1799 | switch (exp) { | |
1800 | case export_gpl: | |
1801 | fatal("modpost: GPL-incompatible module %s%s " | |
1802 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1803 | break; | |
1804 | case export_unused_gpl: | |
1805 | fatal("modpost: GPL-incompatible module %s%s " | |
1806 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1807 | break; | |
1808 | case export_gpl_future: | |
1809 | warn("modpost: GPL-incompatible module %s%s " | |
1810 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1811 | break; | |
1812 | case export_plain: | |
1813 | case export_unused: | |
1814 | case export_unknown: | |
1815 | /* ignore */ | |
1816 | break; | |
1817 | } | |
1818 | } | |
1819 | ||
df578e7d | 1820 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1821 | { |
1822 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1823 | ||
1824 | switch (exp) { | |
1825 | case export_unused: | |
1826 | case export_unused_gpl: | |
1827 | warn("modpost: module %s%s " | |
1828 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1829 | break; | |
1830 | default: | |
1831 | /* ignore */ | |
1832 | break; | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1837 | { |
1838 | struct symbol *s, *exp; | |
1839 | ||
1840 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1841 | const char *basename; |
b817f6fe SR |
1842 | exp = find_symbol(s->name); |
1843 | if (!exp || exp->module == mod) | |
1844 | continue; | |
6449bd62 | 1845 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1846 | if (basename) |
1847 | basename++; | |
c96fca21 SR |
1848 | else |
1849 | basename = mod->name; | |
1850 | if (!mod->gpl_compatible) | |
1851 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1852 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1853 | } |
b817f6fe SR |
1854 | } |
1855 | ||
5c3ead8c SR |
1856 | /** |
1857 | * Header for the generated file | |
1858 | **/ | |
1859 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1860 | { |
1861 | buf_printf(b, "#include <linux/module.h>\n"); | |
1862 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1863 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1864 | buf_printf(b, "\n"); | |
1865 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1866 | buf_printf(b, "\n"); | |
1da177e4 LT |
1867 | buf_printf(b, "struct module __this_module\n"); |
1868 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
3c7ec94d | 1869 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 1870 | if (mod->has_init) |
3c7ec94d | 1871 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
1872 | if (mod->has_cleanup) |
1873 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 1874 | "\t.exit = cleanup_module,\n" |
1da177e4 | 1875 | "#endif\n"); |
3c7ec94d | 1876 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1877 | buf_printf(b, "};\n"); |
1878 | } | |
1879 | ||
2449b8ba BH |
1880 | static void add_intree_flag(struct buffer *b, int is_intree) |
1881 | { | |
1882 | if (is_intree) | |
1883 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
1884 | } | |
1885 | ||
5c725138 | 1886 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1887 | { |
1888 | static const char *staging_dir = "drivers/staging"; | |
1889 | ||
1890 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1891 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1892 | } | |
1893 | ||
5c3ead8c SR |
1894 | /** |
1895 | * Record CRCs for unresolved symbols | |
1896 | **/ | |
c53ddacd | 1897 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1898 | { |
1899 | struct symbol *s, *exp; | |
c53ddacd | 1900 | int err = 0; |
1da177e4 LT |
1901 | |
1902 | for (s = mod->unres; s; s = s->next) { | |
1903 | exp = find_symbol(s->name); | |
1904 | if (!exp || exp->module == mod) { | |
c53ddacd | 1905 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1906 | if (warn_unresolved) { |
1907 | warn("\"%s\" [%s.ko] undefined!\n", | |
1908 | s->name, mod->name); | |
1909 | } else { | |
1910 | merror("\"%s\" [%s.ko] undefined!\n", | |
1911 | s->name, mod->name); | |
1912 | err = 1; | |
1913 | } | |
c53ddacd | 1914 | } |
1da177e4 LT |
1915 | continue; |
1916 | } | |
1917 | s->module = exp->module; | |
1918 | s->crc_valid = exp->crc_valid; | |
1919 | s->crc = exp->crc; | |
1920 | } | |
1921 | ||
1922 | if (!modversions) | |
c53ddacd | 1923 | return err; |
1da177e4 LT |
1924 | |
1925 | buf_printf(b, "\n"); | |
1926 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1927 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1928 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1929 | ||
1930 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1931 | if (!s->module) |
1da177e4 | 1932 | continue; |
1da177e4 | 1933 | if (!s->crc_valid) { |
cb80514d | 1934 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1935 | s->name, mod->name); |
1936 | continue; | |
1937 | } | |
a4b6a77b JH |
1938 | buf_printf(b, "\t{ %#8x, VMLINUX_SYMBOL_STR(%s) },\n", |
1939 | s->crc, s->name); | |
1da177e4 LT |
1940 | } |
1941 | ||
1942 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1943 | |
1944 | return err; | |
1da177e4 LT |
1945 | } |
1946 | ||
5c3ead8c SR |
1947 | static void add_depends(struct buffer *b, struct module *mod, |
1948 | struct module *modules) | |
1da177e4 LT |
1949 | { |
1950 | struct symbol *s; | |
1951 | struct module *m; | |
1952 | int first = 1; | |
1953 | ||
df578e7d | 1954 | for (m = modules; m; m = m->next) |
1da177e4 | 1955 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1956 | |
1957 | buf_printf(b, "\n"); | |
1958 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1959 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1960 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1961 | buf_printf(b, "\"depends="); | |
1962 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1963 | const char *p; |
1da177e4 LT |
1964 | if (!s->module) |
1965 | continue; | |
1966 | ||
1967 | if (s->module->seen) | |
1968 | continue; | |
1969 | ||
1970 | s->module->seen = 1; | |
df578e7d SR |
1971 | p = strrchr(s->module->name, '/'); |
1972 | if (p) | |
a61b2dfd SR |
1973 | p++; |
1974 | else | |
1975 | p = s->module->name; | |
1976 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1977 | first = 0; |
1978 | } | |
1979 | buf_printf(b, "\";\n"); | |
1980 | } | |
1981 | ||
5c3ead8c | 1982 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1983 | { |
1984 | if (mod->srcversion[0]) { | |
1985 | buf_printf(b, "\n"); | |
1986 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1987 | mod->srcversion); | |
1988 | } | |
1989 | } | |
1990 | ||
5c3ead8c | 1991 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1992 | { |
1993 | char *tmp; | |
1994 | FILE *file; | |
1995 | struct stat st; | |
1996 | ||
1997 | file = fopen(fname, "r"); | |
1998 | if (!file) | |
1999 | goto write; | |
2000 | ||
2001 | if (fstat(fileno(file), &st) < 0) | |
2002 | goto close_write; | |
2003 | ||
2004 | if (st.st_size != b->pos) | |
2005 | goto close_write; | |
2006 | ||
2007 | tmp = NOFAIL(malloc(b->pos)); | |
2008 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
2009 | goto free_write; | |
2010 | ||
2011 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2012 | goto free_write; | |
2013 | ||
2014 | free(tmp); | |
2015 | fclose(file); | |
2016 | return; | |
2017 | ||
2018 | free_write: | |
2019 | free(tmp); | |
2020 | close_write: | |
2021 | fclose(file); | |
2022 | write: | |
2023 | file = fopen(fname, "w"); | |
2024 | if (!file) { | |
2025 | perror(fname); | |
2026 | exit(1); | |
2027 | } | |
2028 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2029 | perror(fname); | |
2030 | exit(1); | |
2031 | } | |
2032 | fclose(file); | |
2033 | } | |
2034 | ||
bd5cbced | 2035 | /* parse Module.symvers file. line format: |
534b89a9 | 2036 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2037 | **/ |
040fcc81 | 2038 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2039 | { |
2040 | unsigned long size, pos = 0; | |
2041 | void *file = grab_file(fname, &size); | |
2042 | char *line; | |
2043 | ||
df578e7d | 2044 | if (!file) |
1da177e4 LT |
2045 | /* No symbol versions, silently ignore */ |
2046 | return; | |
2047 | ||
2048 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2049 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2050 | unsigned int crc; |
2051 | struct module *mod; | |
040fcc81 | 2052 | struct symbol *s; |
1da177e4 LT |
2053 | |
2054 | if (!(symname = strchr(line, '\t'))) | |
2055 | goto fail; | |
2056 | *symname++ = '\0'; | |
2057 | if (!(modname = strchr(symname, '\t'))) | |
2058 | goto fail; | |
2059 | *modname++ = '\0'; | |
9ac545b0 | 2060 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2061 | *export++ = '\0'; |
534b89a9 SR |
2062 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2063 | *end = '\0'; | |
1da177e4 LT |
2064 | crc = strtoul(line, &d, 16); |
2065 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2066 | goto fail; | |
df578e7d SR |
2067 | mod = find_module(modname); |
2068 | if (!mod) { | |
2069 | if (is_vmlinux(modname)) | |
1da177e4 | 2070 | have_vmlinux = 1; |
0fa3a88c | 2071 | mod = new_module(modname); |
1da177e4 LT |
2072 | mod->skip = 1; |
2073 | } | |
bd5cbced | 2074 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2075 | s->kernel = kernel; |
2076 | s->preloaded = 1; | |
bd5cbced | 2077 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2078 | } |
2079 | return; | |
2080 | fail: | |
2081 | fatal("parse error in symbol dump file\n"); | |
2082 | } | |
2083 | ||
040fcc81 SR |
2084 | /* For normal builds always dump all symbols. |
2085 | * For external modules only dump symbols | |
2086 | * that are not read from kernel Module.symvers. | |
2087 | **/ | |
2088 | static int dump_sym(struct symbol *sym) | |
2089 | { | |
2090 | if (!external_module) | |
2091 | return 1; | |
2092 | if (sym->vmlinux || sym->kernel) | |
2093 | return 0; | |
2094 | return 1; | |
2095 | } | |
62070fa4 | 2096 | |
5c3ead8c | 2097 | static void write_dump(const char *fname) |
1da177e4 LT |
2098 | { |
2099 | struct buffer buf = { }; | |
2100 | struct symbol *symbol; | |
2101 | int n; | |
2102 | ||
2103 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2104 | symbol = symbolhash[n]; | |
2105 | while (symbol) { | |
040fcc81 | 2106 | if (dump_sym(symbol)) |
bd5cbced | 2107 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2108 | symbol->crc, symbol->name, |
bd5cbced RP |
2109 | symbol->module->name, |
2110 | export_str(symbol->export)); | |
1da177e4 LT |
2111 | symbol = symbol->next; |
2112 | } | |
2113 | } | |
2114 | write_if_changed(&buf, fname); | |
2115 | } | |
2116 | ||
2d04b5ae RH |
2117 | struct ext_sym_list { |
2118 | struct ext_sym_list *next; | |
2119 | const char *file; | |
2120 | }; | |
2121 | ||
5c3ead8c | 2122 | int main(int argc, char **argv) |
1da177e4 LT |
2123 | { |
2124 | struct module *mod; | |
2125 | struct buffer buf = { }; | |
040fcc81 SR |
2126 | char *kernel_read = NULL, *module_read = NULL; |
2127 | char *dump_write = NULL; | |
1da177e4 | 2128 | int opt; |
c53ddacd | 2129 | int err; |
2d04b5ae RH |
2130 | struct ext_sym_list *extsym_iter; |
2131 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2132 | |
6543becf | 2133 | while ((opt = getopt(argc, argv, "i:I:e:msSo:awM:K:")) != -1) { |
df578e7d SR |
2134 | switch (opt) { |
2135 | case 'i': | |
2136 | kernel_read = optarg; | |
2137 | break; | |
2138 | case 'I': | |
2139 | module_read = optarg; | |
2140 | external_module = 1; | |
2141 | break; | |
2d04b5ae RH |
2142 | case 'e': |
2143 | external_module = 1; | |
2144 | extsym_iter = | |
2145 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2146 | extsym_iter->next = extsym_start; | |
2147 | extsym_iter->file = optarg; | |
2148 | extsym_start = extsym_iter; | |
2149 | break; | |
df578e7d SR |
2150 | case 'm': |
2151 | modversions = 1; | |
2152 | break; | |
2153 | case 'o': | |
2154 | dump_write = optarg; | |
2155 | break; | |
2156 | case 'a': | |
2157 | all_versions = 1; | |
2158 | break; | |
2159 | case 's': | |
2160 | vmlinux_section_warnings = 0; | |
2161 | break; | |
588ccd73 SR |
2162 | case 'S': |
2163 | sec_mismatch_verbose = 0; | |
2164 | break; | |
df578e7d SR |
2165 | case 'w': |
2166 | warn_unresolved = 1; | |
2167 | break; | |
2168 | default: | |
2169 | exit(1); | |
1da177e4 LT |
2170 | } |
2171 | } | |
2172 | ||
040fcc81 SR |
2173 | if (kernel_read) |
2174 | read_dump(kernel_read, 1); | |
2175 | if (module_read) | |
2176 | read_dump(module_read, 0); | |
2d04b5ae RH |
2177 | while (extsym_start) { |
2178 | read_dump(extsym_start->file, 0); | |
2179 | extsym_iter = extsym_start->next; | |
2180 | free(extsym_start); | |
2181 | extsym_start = extsym_iter; | |
2182 | } | |
1da177e4 | 2183 | |
df578e7d | 2184 | while (optind < argc) |
1da177e4 | 2185 | read_symbols(argv[optind++]); |
1da177e4 | 2186 | |
b817f6fe SR |
2187 | for (mod = modules; mod; mod = mod->next) { |
2188 | if (mod->skip) | |
2189 | continue; | |
c96fca21 | 2190 | check_exports(mod); |
b817f6fe SR |
2191 | } |
2192 | ||
c53ddacd KK |
2193 | err = 0; |
2194 | ||
1da177e4 | 2195 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2196 | char fname[strlen(mod->name) + 10]; |
2197 | ||
1da177e4 LT |
2198 | if (mod->skip) |
2199 | continue; | |
2200 | ||
2201 | buf.pos = 0; | |
2202 | ||
2203 | add_header(&buf, mod); | |
2449b8ba | 2204 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2205 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2206 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2207 | add_depends(&buf, mod, modules); |
2208 | add_moddevtable(&buf, mod); | |
2209 | add_srcversion(&buf, mod); | |
2210 | ||
2211 | sprintf(fname, "%s.mod.c", mod->name); | |
2212 | write_if_changed(&buf, fname); | |
2213 | } | |
2214 | ||
2215 | if (dump_write) | |
2216 | write_dump(dump_write); | |
588ccd73 | 2217 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2218 | warn("modpost: Found %d section mismatch(es).\n" |
2219 | "To see full details build your kernel with:\n" | |
2220 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2221 | sec_mismatch_count); | |
1da177e4 | 2222 | |
c53ddacd | 2223 | return err; |
1da177e4 | 2224 | } |