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Commit | Line | Data |
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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 LT |
16 | #include <ctype.h> |
17 | #include "modpost.h" | |
5a865c06 | 18 | #include "../../include/generated/autoconf.h" |
b817f6fe | 19 | #include "../../include/linux/license.h" |
1da177e4 | 20 | |
9e1b9b80 AJ |
21 | /* Some toolchains use a `_' prefix for all user symbols. */ |
22 | #ifdef CONFIG_SYMBOL_PREFIX | |
23 | #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX | |
24 | #else | |
25 | #define MODULE_SYMBOL_PREFIX "" | |
26 | #endif | |
27 | ||
28 | ||
1da177e4 LT |
29 | /* Are we using CONFIG_MODVERSIONS? */ |
30 | int modversions = 0; | |
31 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
32 | int have_vmlinux = 0; | |
33 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
34 | static int all_versions = 0; | |
040fcc81 SR |
35 | /* If we are modposting external module set to 1 */ |
36 | static int external_module = 0; | |
8d8d8289 SR |
37 | /* Warn about section mismatch in vmlinux if set to 1 */ |
38 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
39 | /* Only warn about unresolved symbols */ |
40 | static int warn_unresolved = 0; | |
bd5cbced | 41 | /* How a symbol is exported */ |
588ccd73 SR |
42 | static int sec_mismatch_count = 0; |
43 | static int sec_mismatch_verbose = 1; | |
44 | ||
c96fca21 SR |
45 | enum export { |
46 | export_plain, export_unused, export_gpl, | |
47 | export_unused_gpl, export_gpl_future, export_unknown | |
48 | }; | |
1da177e4 | 49 | |
6d9a89ea AK |
50 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
51 | ||
52 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
53 | { |
54 | va_list arglist; | |
55 | ||
56 | fprintf(stderr, "FATAL: "); | |
57 | ||
58 | va_start(arglist, fmt); | |
59 | vfprintf(stderr, fmt, arglist); | |
60 | va_end(arglist); | |
61 | ||
62 | exit(1); | |
63 | } | |
64 | ||
6d9a89ea | 65 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
66 | { |
67 | va_list arglist; | |
68 | ||
69 | fprintf(stderr, "WARNING: "); | |
70 | ||
71 | va_start(arglist, fmt); | |
72 | vfprintf(stderr, fmt, arglist); | |
73 | va_end(arglist); | |
74 | } | |
75 | ||
6d9a89ea | 76 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
77 | { |
78 | va_list arglist; | |
79 | ||
80 | fprintf(stderr, "ERROR: "); | |
81 | ||
82 | va_start(arglist, fmt); | |
83 | vfprintf(stderr, fmt, arglist); | |
84 | va_end(arglist); | |
85 | } | |
86 | ||
040fcc81 SR |
87 | static int is_vmlinux(const char *modname) |
88 | { | |
89 | const char *myname; | |
90 | ||
df578e7d SR |
91 | myname = strrchr(modname, '/'); |
92 | if (myname) | |
040fcc81 SR |
93 | myname++; |
94 | else | |
95 | myname = modname; | |
96 | ||
741f98fe SR |
97 | return (strcmp(myname, "vmlinux") == 0) || |
98 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
99 | } |
100 | ||
1da177e4 LT |
101 | void *do_nofail(void *ptr, const char *expr) |
102 | { | |
df578e7d | 103 | if (!ptr) |
1da177e4 | 104 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 105 | |
1da177e4 LT |
106 | return ptr; |
107 | } | |
108 | ||
109 | /* A list of all modules we processed */ | |
1da177e4 LT |
110 | static struct module *modules; |
111 | ||
5c3ead8c | 112 | static struct module *find_module(char *modname) |
1da177e4 LT |
113 | { |
114 | struct module *mod; | |
115 | ||
116 | for (mod = modules; mod; mod = mod->next) | |
117 | if (strcmp(mod->name, modname) == 0) | |
118 | break; | |
119 | return mod; | |
120 | } | |
121 | ||
5c3ead8c | 122 | static struct module *new_module(char *modname) |
1da177e4 LT |
123 | { |
124 | struct module *mod; | |
125 | char *p, *s; | |
62070fa4 | 126 | |
1da177e4 LT |
127 | mod = NOFAIL(malloc(sizeof(*mod))); |
128 | memset(mod, 0, sizeof(*mod)); | |
129 | p = NOFAIL(strdup(modname)); | |
130 | ||
131 | /* strip trailing .o */ | |
df578e7d SR |
132 | s = strrchr(p, '.'); |
133 | if (s != NULL) | |
1da177e4 LT |
134 | if (strcmp(s, ".o") == 0) |
135 | *s = '\0'; | |
136 | ||
137 | /* add to list */ | |
138 | mod->name = p; | |
b817f6fe | 139 | mod->gpl_compatible = -1; |
1da177e4 LT |
140 | mod->next = modules; |
141 | modules = mod; | |
142 | ||
143 | return mod; | |
144 | } | |
145 | ||
146 | /* A hash of all exported symbols, | |
147 | * struct symbol is also used for lists of unresolved symbols */ | |
148 | ||
149 | #define SYMBOL_HASH_SIZE 1024 | |
150 | ||
151 | struct symbol { | |
152 | struct symbol *next; | |
153 | struct module *module; | |
154 | unsigned int crc; | |
155 | int crc_valid; | |
156 | unsigned int weak:1; | |
040fcc81 SR |
157 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
158 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
159 | * (only for external modules) **/ | |
8e70c458 | 160 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 161 | enum export export; /* Type of export */ |
1da177e4 LT |
162 | char name[0]; |
163 | }; | |
164 | ||
165 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
166 | ||
167 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
168 | static inline unsigned int tdb_hash(const char *name) | |
169 | { | |
170 | unsigned value; /* Used to compute the hash value. */ | |
171 | unsigned i; /* Used to cycle through random values. */ | |
172 | ||
173 | /* Set the initial value from the key size. */ | |
df578e7d | 174 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
175 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
176 | ||
177 | return (1103515243 * value + 12345); | |
178 | } | |
179 | ||
5c3ead8c SR |
180 | /** |
181 | * Allocate a new symbols for use in the hash of exported symbols or | |
182 | * the list of unresolved symbols per module | |
183 | **/ | |
184 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
185 | struct symbol *next) | |
1da177e4 LT |
186 | { |
187 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
188 | ||
189 | memset(s, 0, sizeof(*s)); | |
190 | strcpy(s->name, name); | |
191 | s->weak = weak; | |
192 | s->next = next; | |
193 | return s; | |
194 | } | |
195 | ||
196 | /* For the hash of exported symbols */ | |
bd5cbced RP |
197 | static struct symbol *new_symbol(const char *name, struct module *module, |
198 | enum export export) | |
1da177e4 LT |
199 | { |
200 | unsigned int hash; | |
201 | struct symbol *new; | |
202 | ||
203 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
204 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
205 | new->module = module; | |
bd5cbced | 206 | new->export = export; |
040fcc81 | 207 | return new; |
1da177e4 LT |
208 | } |
209 | ||
5c3ead8c | 210 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
211 | { |
212 | struct symbol *s; | |
213 | ||
214 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
215 | if (name[0] == '.') | |
216 | name++; | |
217 | ||
df578e7d | 218 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
219 | if (strcmp(s->name, name) == 0) |
220 | return s; | |
221 | } | |
222 | return NULL; | |
223 | } | |
224 | ||
bd5cbced RP |
225 | static struct { |
226 | const char *str; | |
227 | enum export export; | |
228 | } export_list[] = { | |
229 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 230 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 231 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 232 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
233 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
234 | { .str = "(unknown)", .export = export_unknown }, | |
235 | }; | |
236 | ||
237 | ||
238 | static const char *export_str(enum export ex) | |
239 | { | |
240 | return export_list[ex].str; | |
241 | } | |
242 | ||
df578e7d | 243 | static enum export export_no(const char *s) |
bd5cbced RP |
244 | { |
245 | int i; | |
df578e7d | 246 | |
534b89a9 SR |
247 | if (!s) |
248 | return export_unknown; | |
bd5cbced RP |
249 | for (i = 0; export_list[i].export != export_unknown; i++) { |
250 | if (strcmp(export_list[i].str, s) == 0) | |
251 | return export_list[i].export; | |
252 | } | |
253 | return export_unknown; | |
254 | } | |
255 | ||
256 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
257 | { | |
258 | if (sec == elf->export_sec) | |
259 | return export_plain; | |
c96fca21 SR |
260 | else if (sec == elf->export_unused_sec) |
261 | return export_unused; | |
bd5cbced RP |
262 | else if (sec == elf->export_gpl_sec) |
263 | return export_gpl; | |
c96fca21 SR |
264 | else if (sec == elf->export_unused_gpl_sec) |
265 | return export_unused_gpl; | |
bd5cbced RP |
266 | else if (sec == elf->export_gpl_future_sec) |
267 | return export_gpl_future; | |
268 | else | |
269 | return export_unknown; | |
270 | } | |
271 | ||
5c3ead8c SR |
272 | /** |
273 | * Add an exported symbol - it may have already been added without a | |
274 | * CRC, in this case just update the CRC | |
275 | **/ | |
bd5cbced RP |
276 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
277 | enum export export) | |
1da177e4 LT |
278 | { |
279 | struct symbol *s = find_symbol(name); | |
280 | ||
281 | if (!s) { | |
bd5cbced | 282 | s = new_symbol(name, mod, export); |
8e70c458 SR |
283 | } else { |
284 | if (!s->preloaded) { | |
7b75b13c | 285 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
286 | "was in %s%s\n", mod->name, name, |
287 | s->module->name, | |
288 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
289 | } else { |
290 | /* In case Modules.symvers was out of date */ | |
291 | s->module = mod; | |
8e70c458 | 292 | } |
1da177e4 | 293 | } |
8e70c458 | 294 | s->preloaded = 0; |
040fcc81 SR |
295 | s->vmlinux = is_vmlinux(mod->name); |
296 | s->kernel = 0; | |
bd5cbced | 297 | s->export = export; |
040fcc81 SR |
298 | return s; |
299 | } | |
300 | ||
301 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 302 | unsigned int crc, enum export export) |
040fcc81 SR |
303 | { |
304 | struct symbol *s = find_symbol(name); | |
305 | ||
306 | if (!s) | |
bd5cbced | 307 | s = new_symbol(name, mod, export); |
040fcc81 SR |
308 | s->crc = crc; |
309 | s->crc_valid = 1; | |
1da177e4 LT |
310 | } |
311 | ||
5c3ead8c | 312 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
313 | { |
314 | struct stat st; | |
315 | void *map; | |
316 | int fd; | |
317 | ||
318 | fd = open(filename, O_RDONLY); | |
319 | if (fd < 0 || fstat(fd, &st) != 0) | |
320 | return NULL; | |
321 | ||
322 | *size = st.st_size; | |
323 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
324 | close(fd); | |
325 | ||
326 | if (map == MAP_FAILED) | |
327 | return NULL; | |
328 | return map; | |
329 | } | |
330 | ||
5c3ead8c SR |
331 | /** |
332 | * Return a copy of the next line in a mmap'ed file. | |
333 | * spaces in the beginning of the line is trimmed away. | |
334 | * Return a pointer to a static buffer. | |
335 | **/ | |
df578e7d | 336 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
337 | { |
338 | static char line[4096]; | |
339 | int skip = 1; | |
340 | size_t len = 0; | |
341 | signed char *p = (signed char *)file + *pos; | |
342 | char *s = line; | |
343 | ||
df578e7d | 344 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
345 | if (skip && isspace(*p)) { |
346 | p++; | |
347 | continue; | |
348 | } | |
349 | skip = 0; | |
350 | if (*p != '\n' && (*pos < size)) { | |
351 | len++; | |
352 | *s++ = *p++; | |
353 | if (len > 4095) | |
354 | break; /* Too long, stop */ | |
355 | } else { | |
356 | /* End of string */ | |
357 | *s = '\0'; | |
358 | return line; | |
359 | } | |
360 | } | |
361 | /* End of buffer */ | |
362 | return NULL; | |
363 | } | |
364 | ||
5c3ead8c | 365 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
366 | { |
367 | munmap(file, size); | |
368 | } | |
369 | ||
85bd2fdd | 370 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
371 | { |
372 | unsigned int i; | |
85bd2fdd | 373 | Elf_Ehdr *hdr; |
1da177e4 LT |
374 | Elf_Shdr *sechdrs; |
375 | Elf_Sym *sym; | |
376 | ||
377 | hdr = grab_file(filename, &info->size); | |
378 | if (!hdr) { | |
379 | perror(filename); | |
6803dc0e | 380 | exit(1); |
1da177e4 LT |
381 | } |
382 | info->hdr = hdr; | |
85bd2fdd SR |
383 | if (info->size < sizeof(*hdr)) { |
384 | /* file too small, assume this is an empty .o file */ | |
385 | return 0; | |
386 | } | |
387 | /* Is this a valid ELF file? */ | |
388 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
389 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
390 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
391 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
392 | /* Not an ELF file - silently ignore it */ | |
393 | return 0; | |
394 | } | |
1da177e4 | 395 | /* Fix endianness in ELF header */ |
7d875a02 AK |
396 | hdr->e_type = TO_NATIVE(hdr->e_type); |
397 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
398 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
399 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
400 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
401 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
402 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
403 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
404 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
405 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
406 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
407 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
408 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
409 | sechdrs = (void *)hdr + hdr->e_shoff; |
410 | info->sechdrs = sechdrs; | |
411 | ||
a83710e5 PS |
412 | /* Check if file offset is correct */ |
413 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
414 | fatal("section header offset=%lu in file '%s' is bigger than " |
415 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
416 | filename, info->size); | |
a83710e5 PS |
417 | return 0; |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* Fix endianness in section headers */ |
421 | for (i = 0; i < hdr->e_shnum; i++) { | |
7d875a02 AK |
422 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
423 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
424 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
425 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
426 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
427 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
428 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
429 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
430 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
431 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
432 | } |
433 | /* Find symbol table. */ | |
434 | for (i = 1; i < hdr->e_shnum; i++) { | |
435 | const char *secstrings | |
436 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 437 | const char *secname; |
56fc82c5 | 438 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 439 | |
56fc82c5 | 440 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
441 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
442 | "sizeof(*hrd)=%zu\n", filename, | |
443 | (unsigned long)sechdrs[i].sh_offset, | |
444 | sizeof(*hdr)); | |
85bd2fdd SR |
445 | return 0; |
446 | } | |
bd5cbced RP |
447 | secname = secstrings + sechdrs[i].sh_name; |
448 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
449 | if (nobits) |
450 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
451 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
452 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
453 | } else if (strcmp(secname, "__ksymtab") == 0) |
454 | info->export_sec = i; | |
c96fca21 SR |
455 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
456 | info->export_unused_sec = i; | |
bd5cbced RP |
457 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
458 | info->export_gpl_sec = i; | |
c96fca21 SR |
459 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
460 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
461 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
462 | info->export_gpl_future_sec = i; | |
463 | ||
1da177e4 LT |
464 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
465 | continue; | |
466 | ||
467 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 468 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 469 | + sechdrs[i].sh_size; |
62070fa4 | 470 | info->strtab = (void *)hdr + |
1da177e4 LT |
471 | sechdrs[sechdrs[i].sh_link].sh_offset; |
472 | } | |
df578e7d | 473 | if (!info->symtab_start) |
cb80514d | 474 | fatal("%s has no symtab?\n", filename); |
df578e7d | 475 | |
1da177e4 LT |
476 | /* Fix endianness in symbols */ |
477 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
478 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
479 | sym->st_name = TO_NATIVE(sym->st_name); | |
480 | sym->st_value = TO_NATIVE(sym->st_value); | |
481 | sym->st_size = TO_NATIVE(sym->st_size); | |
482 | } | |
85bd2fdd | 483 | return 1; |
1da177e4 LT |
484 | } |
485 | ||
5c3ead8c | 486 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
487 | { |
488 | release_file(info->hdr, info->size); | |
489 | } | |
490 | ||
4d7365d6 SR |
491 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
492 | { | |
493 | /* ignore __this_module, it will be resolved shortly */ | |
494 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
495 | return 1; | |
496 | /* ignore global offset table */ | |
497 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
498 | return 1; | |
499 | if (info->hdr->e_machine == EM_PPC) | |
500 | /* Special register function linked on all modules during final link of .ko */ | |
501 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
502 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
503 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
504 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
505 | return 1; | |
7fca5dc8 SR |
506 | if (info->hdr->e_machine == EM_PPC64) |
507 | /* Special register function linked on all modules during final link of .ko */ | |
508 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
509 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) | |
510 | return 1; | |
4d7365d6 SR |
511 | /* Do not ignore this symbol */ |
512 | return 0; | |
513 | } | |
514 | ||
f7b05e64 LY |
515 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
516 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 517 | |
5c3ead8c SR |
518 | static void handle_modversions(struct module *mod, struct elf_info *info, |
519 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
520 | { |
521 | unsigned int crc; | |
bd5cbced | 522 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
523 | |
524 | switch (sym->st_shndx) { | |
525 | case SHN_COMMON: | |
cb80514d | 526 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
527 | break; |
528 | case SHN_ABS: | |
529 | /* CRC'd symbol */ | |
8d99513c | 530 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 531 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
532 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
533 | export); | |
1da177e4 LT |
534 | } |
535 | break; | |
536 | case SHN_UNDEF: | |
537 | /* undefined symbol */ | |
538 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
539 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
540 | break; | |
4d7365d6 | 541 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 542 | break; |
8d529014 BC |
543 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
544 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
545 | /* add compatibility with older glibc */ | |
546 | #ifndef STT_SPARC_REGISTER | |
547 | #define STT_SPARC_REGISTER STT_REGISTER | |
548 | #endif | |
1da177e4 LT |
549 | if (info->hdr->e_machine == EM_SPARC || |
550 | info->hdr->e_machine == EM_SPARCV9) { | |
551 | /* Ignore register directives. */ | |
8d529014 | 552 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 553 | break; |
62070fa4 SR |
554 | if (symname[0] == '.') { |
555 | char *munged = strdup(symname); | |
556 | munged[0] = '_'; | |
557 | munged[1] = toupper(munged[1]); | |
558 | symname = munged; | |
559 | } | |
1da177e4 LT |
560 | } |
561 | #endif | |
62070fa4 | 562 | |
1da177e4 | 563 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
564 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
565 | mod->unres = | |
566 | alloc_symbol(symname + | |
567 | strlen(MODULE_SYMBOL_PREFIX), | |
568 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
569 | mod->unres); | |
570 | } | |
1da177e4 LT |
571 | break; |
572 | default: | |
573 | /* All exported symbols */ | |
8d99513c | 574 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
575 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
576 | export); | |
1da177e4 LT |
577 | } |
578 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
579 | mod->has_init = 1; | |
580 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
581 | mod->has_cleanup = 1; | |
582 | break; | |
583 | } | |
584 | } | |
585 | ||
5c3ead8c SR |
586 | /** |
587 | * Parse tag=value strings from .modinfo section | |
588 | **/ | |
1da177e4 LT |
589 | static char *next_string(char *string, unsigned long *secsize) |
590 | { | |
591 | /* Skip non-zero chars */ | |
592 | while (string[0]) { | |
593 | string++; | |
594 | if ((*secsize)-- <= 1) | |
595 | return NULL; | |
596 | } | |
597 | ||
598 | /* Skip any zero padding. */ | |
599 | while (!string[0]) { | |
600 | string++; | |
601 | if ((*secsize)-- <= 1) | |
602 | return NULL; | |
603 | } | |
604 | return string; | |
605 | } | |
606 | ||
b817f6fe SR |
607 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
608 | const char *tag, char *info) | |
1da177e4 LT |
609 | { |
610 | char *p; | |
611 | unsigned int taglen = strlen(tag); | |
612 | unsigned long size = modinfo_len; | |
613 | ||
b817f6fe SR |
614 | if (info) { |
615 | size -= info - (char *)modinfo; | |
616 | modinfo = next_string(info, &size); | |
617 | } | |
618 | ||
1da177e4 LT |
619 | for (p = modinfo; p; p = next_string(p, &size)) { |
620 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
621 | return p + taglen + 1; | |
622 | } | |
623 | return NULL; | |
624 | } | |
625 | ||
b817f6fe SR |
626 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
627 | const char *tag) | |
628 | ||
629 | { | |
630 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
631 | } | |
632 | ||
4c8fbca5 SR |
633 | /** |
634 | * Test if string s ends in string sub | |
635 | * return 0 if match | |
636 | **/ | |
637 | static int strrcmp(const char *s, const char *sub) | |
638 | { | |
df578e7d | 639 | int slen, sublen; |
62070fa4 | 640 | |
4c8fbca5 SR |
641 | if (!s || !sub) |
642 | return 1; | |
62070fa4 | 643 | |
4c8fbca5 | 644 | slen = strlen(s); |
df578e7d | 645 | sublen = strlen(sub); |
62070fa4 | 646 | |
4c8fbca5 SR |
647 | if ((slen == 0) || (sublen == 0)) |
648 | return 1; | |
649 | ||
df578e7d SR |
650 | if (sublen > slen) |
651 | return 1; | |
4c8fbca5 | 652 | |
df578e7d | 653 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
654 | } |
655 | ||
ff13f926 SR |
656 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
657 | { | |
58fb0d4f SR |
658 | if (sym) |
659 | return elf->strtab + sym->st_name; | |
660 | else | |
f666751a | 661 | return "(unknown)"; |
ff13f926 SR |
662 | } |
663 | ||
664 | static const char *sec_name(struct elf_info *elf, int shndx) | |
665 | { | |
666 | Elf_Shdr *sechdrs = elf->sechdrs; | |
667 | return (void *)elf->hdr + | |
668 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
669 | sechdrs[shndx].sh_name; | |
670 | } | |
671 | ||
672 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
673 | { | |
674 | return (void *)elf->hdr + | |
675 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
676 | sechdr->sh_name; | |
677 | } | |
678 | ||
10668220 SR |
679 | /* if sym is empty or point to a string |
680 | * like ".[0-9]+" then return 1. | |
681 | * This is the optional prefix added by ld to some sections | |
682 | */ | |
683 | static int number_prefix(const char *sym) | |
684 | { | |
685 | if (*sym++ == '\0') | |
686 | return 1; | |
687 | if (*sym != '.') | |
688 | return 0; | |
689 | do { | |
690 | char c = *sym++; | |
691 | if (c < '0' || c > '9') | |
692 | return 0; | |
693 | } while (*sym); | |
694 | return 1; | |
695 | } | |
696 | ||
697 | /* The pattern is an array of simple patterns. | |
698 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 699 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
700 | * "foo*" will match a string that begins with "foo" |
701 | * "foo$" will match a string equal to "foo" or "foo.1" | |
702 | * where the '1' can be any number including several digits. | |
703 | * The $ syntax is for sections where ld append a dot number | |
704 | * to make section name unique. | |
705 | */ | |
5c725138 | 706 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
707 | { |
708 | const char *p; | |
709 | while (*pat) { | |
710 | p = *pat++; | |
711 | const char *endp = p + strlen(p) - 1; | |
712 | ||
6c5bd235 SR |
713 | /* "*foo" */ |
714 | if (*p == '*') { | |
715 | if (strrcmp(sym, p + 1) == 0) | |
716 | return 1; | |
717 | } | |
10668220 | 718 | /* "foo*" */ |
6c5bd235 | 719 | else if (*endp == '*') { |
10668220 SR |
720 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
721 | return 1; | |
722 | } | |
723 | /* "foo$" */ | |
724 | else if (*endp == '$') { | |
725 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
726 | if (number_prefix(sym + strlen(p) - 1)) | |
727 | return 1; | |
728 | } | |
729 | } | |
730 | /* no wildcards */ | |
731 | else { | |
732 | if (strcmp(p, sym) == 0) | |
733 | return 1; | |
734 | } | |
735 | } | |
736 | /* no match */ | |
737 | return 0; | |
738 | } | |
739 | ||
10668220 SR |
740 | /* sections that we do not want to do full section mismatch check on */ |
741 | static const char *section_white_list[] = | |
4391ed6a SR |
742 | { |
743 | ".comment*", | |
744 | ".debug*", | |
745 | ".mdebug*", /* alpha, score, mips etc. */ | |
746 | ".pdr", /* alpha, score, mips etc. */ | |
747 | ".stab*", | |
748 | ".note*", | |
749 | ".got*", | |
750 | ".toc*", | |
751 | NULL | |
752 | }; | |
10668220 | 753 | |
e241a630 | 754 | /* |
b614a697 | 755 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 756 | * The cause of this is often a section specified in assembler |
b614a697 | 757 | * without "ax" / "aw". |
e241a630 | 758 | */ |
b614a697 AK |
759 | static void check_section(const char *modname, struct elf_info *elf, |
760 | Elf_Shdr *sechdr) | |
e241a630 | 761 | { |
b614a697 AK |
762 | const char *sec = sech_name(elf, sechdr); |
763 | ||
764 | if (sechdr->sh_type == SHT_PROGBITS && | |
765 | !(sechdr->sh_flags & SHF_ALLOC) && | |
766 | !match(sec, section_white_list)) { | |
767 | warn("%s (%s): unexpected non-allocatable section.\n" | |
768 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
769 | "Note that for example <linux/init.h> contains\n" | |
770 | "section definitions for use in .S files.\n\n", | |
771 | modname, sec); | |
e241a630 | 772 | } |
e241a630 SR |
773 | } |
774 | ||
775 | ||
776 | ||
eb8f6890 | 777 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d JB |
778 | ".init.setup$", ".init.rodata$", \ |
779 | ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ | |
eb8f6890 SR |
780 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" |
781 | #define ALL_EXIT_DATA_SECTIONS \ | |
782 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 783 | |
eb8f6890 SR |
784 | #define ALL_INIT_TEXT_SECTIONS \ |
785 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
786 | #define ALL_EXIT_TEXT_SECTIONS \ | |
787 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 788 | |
4a31a229 UKK |
789 | #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \ |
790 | MEM_INIT_SECTIONS | |
791 | #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \ | |
792 | MEM_EXIT_SECTIONS | |
793 | ||
794 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
795 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 796 | |
6c5bd235 | 797 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
798 | #define TEXT_SECTIONS ".text$" |
799 | ||
fd6c3a8d JB |
800 | #define INIT_SECTIONS ".init.*" |
801 | #define DEV_INIT_SECTIONS ".devinit.*" | |
802 | #define CPU_INIT_SECTIONS ".cpuinit.*" | |
803 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 804 | |
fd6c3a8d JB |
805 | #define EXIT_SECTIONS ".exit.*" |
806 | #define DEV_EXIT_SECTIONS ".devexit.*" | |
807 | #define CPU_EXIT_SECTIONS ".cpuexit.*" | |
808 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 809 | |
6c5bd235 | 810 | /* init data sections */ |
eb8f6890 | 811 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
812 | |
813 | /* all init sections */ | |
eb8f6890 | 814 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
815 | |
816 | /* All init and exit sections (code + data) */ | |
817 | static const char *init_exit_sections[] = | |
eb8f6890 | 818 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
819 | |
820 | /* data section */ | |
821 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
822 | ||
6c5bd235 SR |
823 | |
824 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
825 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
826 | "*driver", \ | |
827 | "*_template", /* scsi uses *_template a lot */ \ | |
828 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
829 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
830 | "*_ops", \ | |
831 | "*_probe", \ | |
832 | "*_probe_one", \ | |
833 | "*_console" | |
6c5bd235 SR |
834 | |
835 | static const char *head_sections[] = { ".head.text*", NULL }; | |
836 | static const char *linker_symbols[] = | |
837 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
838 | ||
588ccd73 | 839 | enum mismatch { |
bbd3f4fb UKK |
840 | TEXT_TO_ANY_INIT, |
841 | DATA_TO_ANY_INIT, | |
842 | TEXT_TO_ANY_EXIT, | |
843 | DATA_TO_ANY_EXIT, | |
844 | XXXINIT_TO_SOME_INIT, | |
845 | XXXEXIT_TO_SOME_EXIT, | |
846 | ANY_INIT_TO_ANY_EXIT, | |
847 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
848 | EXPORT_TO_INIT_EXIT, |
849 | }; | |
850 | ||
10668220 SR |
851 | struct sectioncheck { |
852 | const char *fromsec[20]; | |
853 | const char *tosec[20]; | |
588ccd73 | 854 | enum mismatch mismatch; |
af92a82d | 855 | const char *symbol_white_list[20]; |
10668220 SR |
856 | }; |
857 | ||
858 | const struct sectioncheck sectioncheck[] = { | |
859 | /* Do not reference init/exit code/data from | |
860 | * normal code and data | |
861 | */ | |
862 | { | |
588ccd73 SR |
863 | .fromsec = { TEXT_SECTIONS, NULL }, |
864 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 865 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 866 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
867 | }, |
868 | { | |
869 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 870 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 871 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 872 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 873 | }, |
0db25245 UKK |
874 | { |
875 | .fromsec = { DATA_SECTIONS, NULL }, | |
876 | .tosec = { INIT_SECTIONS, NULL }, | |
877 | .mismatch = DATA_TO_ANY_INIT, | |
878 | .symbol_white_list = { | |
879 | "*_template", "*_timer", "*_sht", "*_ops", | |
880 | "*_probe", "*_probe_one", "*_console", NULL | |
881 | }, | |
882 | }, | |
588ccd73 SR |
883 | { |
884 | .fromsec = { TEXT_SECTIONS, NULL }, | |
885 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 886 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 887 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
888 | }, |
889 | { | |
890 | .fromsec = { DATA_SECTIONS, NULL }, | |
891 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 892 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 893 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 SR |
894 | }, |
895 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
896 | { | |
4a31a229 | 897 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 898 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 899 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 900 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 901 | }, |
fd6c3a8d JB |
902 | /* Do not reference cpuinit code/data from meminit code/data */ |
903 | { | |
904 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
905 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 906 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 907 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
908 | }, |
909 | /* Do not reference meminit code/data from cpuinit code/data */ | |
910 | { | |
911 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
912 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 913 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 914 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 915 | }, |
eb8f6890 SR |
916 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ |
917 | { | |
4a31a229 | 918 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 919 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 920 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 921 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 922 | }, |
fd6c3a8d JB |
923 | /* Do not reference cpuexit code/data from memexit code/data */ |
924 | { | |
925 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
926 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 927 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 928 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
929 | }, |
930 | /* Do not reference memexit code/data from cpuexit code/data */ | |
931 | { | |
932 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
933 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 934 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 935 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 936 | }, |
10668220 SR |
937 | /* Do not use exit code/data from init code */ |
938 | { | |
eb8f6890 SR |
939 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
940 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 941 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 942 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
943 | }, |
944 | /* Do not use init code/data from exit code */ | |
945 | { | |
eb8f6890 | 946 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 947 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 948 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 949 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
950 | }, |
951 | /* Do not export init/exit functions or data */ | |
952 | { | |
953 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 954 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
955 | .mismatch = EXPORT_TO_INIT_EXIT, |
956 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
957 | } |
958 | }; | |
959 | ||
0d2a636e UKK |
960 | static const struct sectioncheck *section_mismatch( |
961 | const char *fromsec, const char *tosec) | |
10668220 SR |
962 | { |
963 | int i; | |
964 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
965 | const struct sectioncheck *check = §ioncheck[0]; | |
966 | ||
967 | for (i = 0; i < elems; i++) { | |
968 | if (match(fromsec, check->fromsec) && | |
969 | match(tosec, check->tosec)) | |
0d2a636e | 970 | return check; |
10668220 SR |
971 | check++; |
972 | } | |
0d2a636e | 973 | return NULL; |
10668220 SR |
974 | } |
975 | ||
4c8fbca5 SR |
976 | /** |
977 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 978 | * |
4c8fbca5 SR |
979 | * Pattern 1: |
980 | * If a module parameter is declared __initdata and permissions=0 | |
981 | * then this is legal despite the warning generated. | |
982 | * We cannot see value of permissions here, so just ignore | |
983 | * this pattern. | |
984 | * The pattern is identified by: | |
985 | * tosec = .init.data | |
9209aed0 | 986 | * fromsec = .data* |
4c8fbca5 | 987 | * atsym =__param* |
62070fa4 | 988 | * |
4c8fbca5 | 989 | * Pattern 2: |
72ee59b5 | 990 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 991 | * add, remove, probe functions etc. |
b75dcabd | 992 | * These functions may often be marked __devinit and we do not want to |
4c8fbca5 SR |
993 | * warn here. |
994 | * the pattern is identified by: | |
83cda2bb SR |
995 | * tosec = init or exit section |
996 | * fromsec = data section | |
df578e7d SR |
997 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
998 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
999 | * |
1000 | * Pattern 3: | |
c993971f | 1001 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1002 | * |
1d8af559 | 1003 | * Pattern 4: |
ee6a8545 VG |
1004 | * Some symbols belong to init section but still it is ok to reference |
1005 | * these from non-init sections as these symbols don't have any memory | |
1006 | * allocated for them and symbol address and value are same. So even | |
1007 | * if init section is freed, its ok to reference those symbols. | |
1008 | * For ex. symbols marking the init section boundaries. | |
1009 | * This pattern is identified by | |
1010 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1011 | * |
4c8fbca5 | 1012 | **/ |
af92a82d UKK |
1013 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1014 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1015 | const char *tosec, const char *tosym) |
4c8fbca5 | 1016 | { |
4c8fbca5 | 1017 | /* Check for pattern 1 */ |
6c5bd235 SR |
1018 | if (match(tosec, init_data_sections) && |
1019 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1020 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1021 | return 0; | |
4c8fbca5 SR |
1022 | |
1023 | /* Check for pattern 2 */ | |
6c5bd235 SR |
1024 | if (match(tosec, init_exit_sections) && |
1025 | match(fromsec, data_sections) && | |
af92a82d | 1026 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1027 | return 0; |
4c8fbca5 | 1028 | |
9bf8cb9b | 1029 | /* Check for pattern 3 */ |
6c5bd235 SR |
1030 | if (match(fromsec, head_sections) && |
1031 | match(tosec, init_sections)) | |
58fb0d4f | 1032 | return 0; |
9bf8cb9b | 1033 | |
1d8af559 | 1034 | /* Check for pattern 4 */ |
58fb0d4f SR |
1035 | if (match(tosym, linker_symbols)) |
1036 | return 0; | |
9bf8cb9b | 1037 | |
58fb0d4f | 1038 | return 1; |
4c8fbca5 SR |
1039 | } |
1040 | ||
93684d3b SR |
1041 | /** |
1042 | * Find symbol based on relocation record info. | |
1043 | * In some cases the symbol supplied is a valid symbol so | |
1044 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1045 | * In other cases the symbol needs to be looked up in the symbol table | |
1046 | * based on section and address. | |
1047 | * **/ | |
9ad21c3f | 1048 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1049 | Elf_Sym *relsym) |
1050 | { | |
1051 | Elf_Sym *sym; | |
9ad21c3f SR |
1052 | Elf_Sym *near = NULL; |
1053 | Elf64_Sword distance = 20; | |
1054 | Elf64_Sword d; | |
93684d3b SR |
1055 | |
1056 | if (relsym->st_name != 0) | |
1057 | return relsym; | |
1058 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
1059 | if (sym->st_shndx != relsym->st_shndx) | |
1060 | continue; | |
ae4ac123 AN |
1061 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1062 | continue; | |
93684d3b SR |
1063 | if (sym->st_value == addr) |
1064 | return sym; | |
9ad21c3f SR |
1065 | /* Find a symbol nearby - addr are maybe negative */ |
1066 | d = sym->st_value - addr; | |
1067 | if (d < 0) | |
1068 | d = addr - sym->st_value; | |
1069 | if (d < distance) { | |
1070 | distance = d; | |
1071 | near = sym; | |
1072 | } | |
93684d3b | 1073 | } |
9ad21c3f SR |
1074 | /* We need a close match */ |
1075 | if (distance < 20) | |
1076 | return near; | |
1077 | else | |
1078 | return NULL; | |
93684d3b SR |
1079 | } |
1080 | ||
da68d61f DB |
1081 | static inline int is_arm_mapping_symbol(const char *str) |
1082 | { | |
1083 | return str[0] == '$' && strchr("atd", str[1]) | |
1084 | && (str[2] == '\0' || str[2] == '.'); | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1089 | * one of the magic symbols emitted used by current ARM tools. | |
1090 | * | |
1091 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1092 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1093 | * only by merging __exit and __init sections into __text, bloating | |
1094 | * the kernel (which is especially evil on embedded platforms). | |
1095 | */ | |
1096 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1097 | { | |
1098 | const char *name = elf->strtab + sym->st_name; | |
1099 | ||
1100 | if (!name || !strlen(name)) | |
1101 | return 0; | |
1102 | return !is_arm_mapping_symbol(name); | |
1103 | } | |
1104 | ||
b39927cf | 1105 | /* |
43c74d17 SR |
1106 | * Find symbols before or equal addr and after addr - in the section sec. |
1107 | * If we find two symbols with equal offset prefer one with a valid name. | |
1108 | * The ELF format may have a better way to detect what type of symbol | |
1109 | * it is, but this works for now. | |
b39927cf | 1110 | **/ |
157c23c8 SR |
1111 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1112 | const char *sec) | |
b39927cf SR |
1113 | { |
1114 | Elf_Sym *sym; | |
157c23c8 | 1115 | Elf_Sym *near = NULL; |
157c23c8 | 1116 | Elf_Addr distance = ~0; |
62070fa4 | 1117 | |
b39927cf SR |
1118 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1119 | const char *symsec; | |
1120 | ||
1121 | if (sym->st_shndx >= SHN_LORESERVE) | |
1122 | continue; | |
ff13f926 | 1123 | symsec = sec_name(elf, sym->st_shndx); |
b39927cf SR |
1124 | if (strcmp(symsec, sec) != 0) |
1125 | continue; | |
da68d61f DB |
1126 | if (!is_valid_name(elf, sym)) |
1127 | continue; | |
b39927cf | 1128 | if (sym->st_value <= addr) { |
157c23c8 SR |
1129 | if ((addr - sym->st_value) < distance) { |
1130 | distance = addr - sym->st_value; | |
1131 | near = sym; | |
1132 | } else if ((addr - sym->st_value) == distance) { | |
1133 | near = sym; | |
43c74d17 | 1134 | } |
b39927cf SR |
1135 | } |
1136 | } | |
157c23c8 | 1137 | return near; |
b39927cf SR |
1138 | } |
1139 | ||
588ccd73 SR |
1140 | /* |
1141 | * Convert a section name to the function/data attribute | |
1142 | * .init.text => __init | |
1143 | * .cpuinit.data => __cpudata | |
1144 | * .memexitconst => __memconst | |
1145 | * etc. | |
1146 | */ | |
1147 | static char *sec2annotation(const char *s) | |
1148 | { | |
1149 | if (match(s, init_exit_sections)) { | |
1150 | char *p = malloc(20); | |
1151 | char *r = p; | |
1152 | ||
1153 | *p++ = '_'; | |
1154 | *p++ = '_'; | |
1155 | if (*s == '.') | |
1156 | s++; | |
1157 | while (*s && *s != '.') | |
1158 | *p++ = *s++; | |
1159 | *p = '\0'; | |
1160 | if (*s == '.') | |
1161 | s++; | |
1162 | if (strstr(s, "rodata") != NULL) | |
1163 | strcat(p, "const "); | |
1164 | else if (strstr(s, "data") != NULL) | |
1165 | strcat(p, "data "); | |
1166 | else | |
1167 | strcat(p, " "); | |
1168 | return r; /* we leak her but we do not care */ | |
1169 | } else { | |
1170 | return ""; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | static int is_function(Elf_Sym *sym) | |
1175 | { | |
1176 | if (sym) | |
1177 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1178 | else | |
f666751a | 1179 | return -1; |
588ccd73 SR |
1180 | } |
1181 | ||
58fb0d4f | 1182 | /* |
b39927cf SR |
1183 | * Print a warning about a section mismatch. |
1184 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1185 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1186 | */ |
0d2a636e UKK |
1187 | static void report_sec_mismatch(const char *modname, |
1188 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1189 | const char *fromsec, |
1190 | unsigned long long fromaddr, | |
1191 | const char *fromsym, | |
588ccd73 SR |
1192 | int from_is_func, |
1193 | const char *tosec, const char *tosym, | |
1194 | int to_is_func) | |
1195 | { | |
1196 | const char *from, *from_p; | |
1197 | const char *to, *to_p; | |
f666751a SR |
1198 | |
1199 | switch (from_is_func) { | |
1200 | case 0: from = "variable"; from_p = ""; break; | |
1201 | case 1: from = "function"; from_p = "()"; break; | |
1202 | default: from = "(unknown reference)"; from_p = ""; break; | |
1203 | } | |
1204 | switch (to_is_func) { | |
1205 | case 0: to = "variable"; to_p = ""; break; | |
1206 | case 1: to = "function"; to_p = "()"; break; | |
1207 | default: to = "(unknown reference)"; to_p = ""; break; | |
1208 | } | |
588ccd73 | 1209 | |
e5f95c8b SR |
1210 | sec_mismatch_count++; |
1211 | if (!sec_mismatch_verbose) | |
1212 | return; | |
1213 | ||
7c0ac495 GU |
1214 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1215 | "to the %s %s:%s%s\n", | |
1216 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1217 | tosym, to_p); | |
588ccd73 | 1218 | |
0d2a636e | 1219 | switch (mismatch->mismatch) { |
bbd3f4fb | 1220 | case TEXT_TO_ANY_INIT: |
588ccd73 | 1221 | fprintf(stderr, |
f666751a | 1222 | "The function %s%s() references\n" |
588ccd73 SR |
1223 | "the %s %s%s%s.\n" |
1224 | "This is often because %s lacks a %s\n" | |
1225 | "annotation or the annotation of %s is wrong.\n", | |
1226 | sec2annotation(fromsec), fromsym, | |
1227 | to, sec2annotation(tosec), tosym, to_p, | |
1228 | fromsym, sec2annotation(tosec), tosym); | |
1229 | break; | |
bbd3f4fb | 1230 | case DATA_TO_ANY_INIT: { |
af92a82d | 1231 | const char *const *s = mismatch->symbol_white_list; |
588ccd73 SR |
1232 | fprintf(stderr, |
1233 | "The variable %s references\n" | |
1234 | "the %s %s%s%s\n" | |
1235 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1236 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 SR |
1237 | "or name the variable:\n", |
1238 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1239 | while (*s) | |
1240 | fprintf(stderr, "%s, ", *s++); | |
1241 | fprintf(stderr, "\n"); | |
1242 | break; | |
58fb0d4f | 1243 | } |
bbd3f4fb | 1244 | case TEXT_TO_ANY_EXIT: |
588ccd73 SR |
1245 | fprintf(stderr, |
1246 | "The function %s() references a %s in an exit section.\n" | |
1247 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1248 | "and the fix is to remove the %sannotation of %s.\n", | |
1249 | fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym); | |
1250 | break; | |
bbd3f4fb | 1251 | case DATA_TO_ANY_EXIT: { |
af92a82d | 1252 | const char *const *s = mismatch->symbol_white_list; |
588ccd73 SR |
1253 | fprintf(stderr, |
1254 | "The variable %s references\n" | |
1255 | "the %s %s%s%s\n" | |
1256 | "If the reference is valid then annotate the\n" | |
1257 | "variable with __exit* (see linux/init.h) or " | |
1258 | "name the variable:\n", | |
1259 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1260 | while (*s) | |
1261 | fprintf(stderr, "%s, ", *s++); | |
1262 | fprintf(stderr, "\n"); | |
1263 | break; | |
1264 | } | |
bbd3f4fb UKK |
1265 | case XXXINIT_TO_SOME_INIT: |
1266 | case XXXEXIT_TO_SOME_EXIT: | |
588ccd73 SR |
1267 | fprintf(stderr, |
1268 | "The %s %s%s%s references\n" | |
1269 | "a %s %s%s%s.\n" | |
1270 | "If %s is only used by %s then\n" | |
1271 | "annotate %s with a matching annotation.\n", | |
1272 | from, sec2annotation(fromsec), fromsym, from_p, | |
1273 | to, sec2annotation(tosec), tosym, to_p, | |
b1d2675a | 1274 | tosym, fromsym, tosym); |
588ccd73 | 1275 | break; |
bbd3f4fb | 1276 | case ANY_INIT_TO_ANY_EXIT: |
588ccd73 SR |
1277 | fprintf(stderr, |
1278 | "The %s %s%s%s references\n" | |
1279 | "a %s %s%s%s.\n" | |
1280 | "This is often seen when error handling " | |
1281 | "in the init function\n" | |
1282 | "uses functionality in the exit path.\n" | |
1283 | "The fix is often to remove the %sannotation of\n" | |
1284 | "%s%s so it may be used outside an exit section.\n", | |
1285 | from, sec2annotation(fromsec), fromsym, from_p, | |
1286 | to, sec2annotation(tosec), tosym, to_p, | |
1287 | sec2annotation(tosec), tosym, to_p); | |
1288 | break; | |
bbd3f4fb | 1289 | case ANY_EXIT_TO_ANY_INIT: |
588ccd73 SR |
1290 | fprintf(stderr, |
1291 | "The %s %s%s%s references\n" | |
1292 | "a %s %s%s%s.\n" | |
1293 | "This is often seen when error handling " | |
1294 | "in the exit function\n" | |
1295 | "uses functionality in the init path.\n" | |
1296 | "The fix is often to remove the %sannotation of\n" | |
1297 | "%s%s so it may be used outside an init section.\n", | |
1298 | from, sec2annotation(fromsec), fromsym, from_p, | |
1299 | to, sec2annotation(tosec), tosym, to_p, | |
1300 | sec2annotation(tosec), tosym, to_p); | |
1301 | break; | |
1302 | case EXPORT_TO_INIT_EXIT: | |
1303 | fprintf(stderr, | |
1304 | "The symbol %s is exported and annotated %s\n" | |
1305 | "Fix this by removing the %sannotation of %s " | |
1306 | "or drop the export.\n", | |
1307 | tosym, sec2annotation(tosec), sec2annotation(tosec), tosym); | |
588ccd73 SR |
1308 | break; |
1309 | } | |
1310 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1311 | } |
1312 | ||
1313 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1314 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1315 | { | |
1316 | const char *tosec; | |
0d2a636e | 1317 | const struct sectioncheck *mismatch; |
58fb0d4f SR |
1318 | |
1319 | tosec = sec_name(elf, sym->st_shndx); | |
588ccd73 | 1320 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1321 | if (mismatch) { |
588ccd73 SR |
1322 | Elf_Sym *to; |
1323 | Elf_Sym *from; | |
58fb0d4f | 1324 | const char *tosym; |
588ccd73 | 1325 | const char *fromsym; |
58fb0d4f | 1326 | |
588ccd73 SR |
1327 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1328 | fromsym = sym_name(elf, from); | |
1329 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1330 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1331 | |
1332 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1333 | if (secref_whitelist(mismatch, |
1334 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1335 | report_sec_mismatch(modname, mismatch, |
1336 | fromsec, r->r_offset, fromsym, | |
1337 | is_function(from), tosec, tosym, | |
1338 | is_function(to)); | |
58fb0d4f | 1339 | } |
b39927cf SR |
1340 | } |
1341 | } | |
1342 | ||
ae4ac123 | 1343 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1344 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1345 | { |
1346 | Elf_Shdr *sechdrs = elf->sechdrs; | |
5b24c071 | 1347 | int section = sechdr->sh_info; |
ae4ac123 AN |
1348 | |
1349 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
1c938663 | 1350 | r->r_offset - sechdrs[section].sh_addr; |
ae4ac123 AN |
1351 | } |
1352 | ||
5b24c071 | 1353 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1354 | { |
1355 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1356 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1357 | |
1358 | switch (r_typ) { | |
1359 | case R_386_32: | |
1360 | r->r_addend = TO_NATIVE(*location); | |
1361 | break; | |
1362 | case R_386_PC32: | |
1363 | r->r_addend = TO_NATIVE(*location) + 4; | |
1364 | /* For CONFIG_RELOCATABLE=y */ | |
1365 | if (elf->hdr->e_type == ET_EXEC) | |
1366 | r->r_addend += r->r_offset; | |
1367 | break; | |
1368 | } | |
1369 | return 0; | |
1370 | } | |
1371 | ||
5b24c071 | 1372 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1373 | { |
1374 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1375 | ||
1376 | switch (r_typ) { | |
1377 | case R_ARM_ABS32: | |
1378 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1379 | r->r_addend = (int)(long) |
1380 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1381 | break; |
1382 | case R_ARM_PC24: | |
1383 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1384 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1385 | sechdr->sh_offset + |
1386 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1387 | break; |
1388 | default: | |
1389 | return 1; | |
1390 | } | |
1391 | return 0; | |
1392 | } | |
1393 | ||
5b24c071 | 1394 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1395 | { |
1396 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1397 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1398 | unsigned int inst; |
1399 | ||
1400 | if (r_typ == R_MIPS_HI16) | |
1401 | return 1; /* skip this */ | |
1402 | inst = TO_NATIVE(*location); | |
1403 | switch (r_typ) { | |
1404 | case R_MIPS_LO16: | |
1405 | r->r_addend = inst & 0xffff; | |
1406 | break; | |
1407 | case R_MIPS_26: | |
1408 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1409 | break; | |
1410 | case R_MIPS_32: | |
1411 | r->r_addend = inst; | |
1412 | break; | |
1413 | } | |
1414 | return 0; | |
1415 | } | |
1416 | ||
5b24c071 | 1417 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1418 | Elf_Shdr *sechdr) |
5b24c071 SR |
1419 | { |
1420 | Elf_Sym *sym; | |
1421 | Elf_Rela *rela; | |
1422 | Elf_Rela r; | |
1423 | unsigned int r_sym; | |
1424 | const char *fromsec; | |
5b24c071 | 1425 | |
ff13f926 | 1426 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1427 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1428 | ||
ff13f926 | 1429 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1430 | fromsec += strlen(".rela"); |
1431 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1432 | if (match(fromsec, section_white_list)) |
5b24c071 | 1433 | return; |
e241a630 | 1434 | |
5b24c071 SR |
1435 | for (rela = start; rela < stop; rela++) { |
1436 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1437 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1438 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1439 | unsigned int r_typ; |
1440 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1441 | r_sym = TO_NATIVE(r_sym); | |
1442 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1443 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1444 | } else { | |
1445 | r.r_info = TO_NATIVE(rela->r_info); | |
1446 | r_sym = ELF_R_SYM(r.r_info); | |
1447 | } | |
1448 | #else | |
1449 | r.r_info = TO_NATIVE(rela->r_info); | |
1450 | r_sym = ELF_R_SYM(r.r_info); | |
1451 | #endif | |
1452 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1453 | sym = elf->symtab_start + r_sym; | |
1454 | /* Skip special sections */ | |
1455 | if (sym->st_shndx >= SHN_LORESERVE) | |
1456 | continue; | |
58fb0d4f | 1457 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1458 | } |
1459 | } | |
1460 | ||
1461 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1462 | Elf_Shdr *sechdr) |
5b24c071 SR |
1463 | { |
1464 | Elf_Sym *sym; | |
1465 | Elf_Rel *rel; | |
1466 | Elf_Rela r; | |
1467 | unsigned int r_sym; | |
1468 | const char *fromsec; | |
5b24c071 | 1469 | |
ff13f926 | 1470 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1471 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1472 | ||
ff13f926 | 1473 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1474 | fromsec += strlen(".rel"); |
1475 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1476 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1477 | return; |
1478 | ||
1479 | for (rel = start; rel < stop; rel++) { | |
1480 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1481 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1482 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1483 | unsigned int r_typ; |
1484 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1485 | r_sym = TO_NATIVE(r_sym); | |
1486 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1487 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1488 | } else { | |
1489 | r.r_info = TO_NATIVE(rel->r_info); | |
1490 | r_sym = ELF_R_SYM(r.r_info); | |
1491 | } | |
1492 | #else | |
1493 | r.r_info = TO_NATIVE(rel->r_info); | |
1494 | r_sym = ELF_R_SYM(r.r_info); | |
1495 | #endif | |
1496 | r.r_addend = 0; | |
ff13f926 | 1497 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1498 | case EM_386: |
1499 | if (addend_386_rel(elf, sechdr, &r)) | |
1500 | continue; | |
1501 | break; | |
1502 | case EM_ARM: | |
1503 | if (addend_arm_rel(elf, sechdr, &r)) | |
1504 | continue; | |
1505 | break; | |
1506 | case EM_MIPS: | |
1507 | if (addend_mips_rel(elf, sechdr, &r)) | |
1508 | continue; | |
1509 | break; | |
1510 | } | |
1511 | sym = elf->symtab_start + r_sym; | |
1512 | /* Skip special sections */ | |
1513 | if (sym->st_shndx >= SHN_LORESERVE) | |
1514 | continue; | |
58fb0d4f | 1515 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1516 | } |
1517 | } | |
1518 | ||
b39927cf SR |
1519 | /** |
1520 | * A module includes a number of sections that are discarded | |
1521 | * either when loaded or when used as built-in. | |
1522 | * For loaded modules all functions marked __init and all data | |
1523 | * marked __initdata will be discarded when the module has been intialized. | |
1524 | * Likewise for modules used built-in the sections marked __exit | |
1525 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1526 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1527 | * The check_sec_ref() function traverses all relocation records |
1528 | * to find all references to a section that reference a section that will | |
1529 | * be discarded and warns about it. | |
1530 | **/ | |
1531 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1532 | struct elf_info *elf) |
b39927cf SR |
1533 | { |
1534 | int i; | |
b39927cf | 1535 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1536 | |
b39927cf | 1537 | /* Walk through all sections */ |
ff13f926 | 1538 | for (i = 0; i < elf->hdr->e_shnum; i++) { |
b614a697 | 1539 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1540 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1541 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1542 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1543 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1544 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1545 | } |
1546 | } | |
1547 | ||
5c3ead8c | 1548 | static void read_symbols(char *modname) |
1da177e4 LT |
1549 | { |
1550 | const char *symname; | |
1551 | char *version; | |
b817f6fe | 1552 | char *license; |
1da177e4 LT |
1553 | struct module *mod; |
1554 | struct elf_info info = { }; | |
1555 | Elf_Sym *sym; | |
1556 | ||
85bd2fdd SR |
1557 | if (!parse_elf(&info, modname)) |
1558 | return; | |
1da177e4 LT |
1559 | |
1560 | mod = new_module(modname); | |
1561 | ||
1562 | /* When there's no vmlinux, don't print warnings about | |
1563 | * unresolved symbols (since there'll be too many ;) */ | |
1564 | if (is_vmlinux(modname)) { | |
1da177e4 | 1565 | have_vmlinux = 1; |
1da177e4 LT |
1566 | mod->skip = 1; |
1567 | } | |
1568 | ||
b817f6fe | 1569 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1570 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1571 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1572 | "see include/linux/module.h for " | |
1573 | "more information\n", modname); | |
b817f6fe SR |
1574 | while (license) { |
1575 | if (license_is_gpl_compatible(license)) | |
1576 | mod->gpl_compatible = 1; | |
1577 | else { | |
1578 | mod->gpl_compatible = 0; | |
1579 | break; | |
1580 | } | |
1581 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1582 | "license", license); | |
1583 | } | |
1584 | ||
1da177e4 LT |
1585 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1586 | symname = info.strtab + sym->st_name; | |
1587 | ||
1588 | handle_modversions(mod, &info, sym, symname); | |
1589 | handle_moddevtable(mod, &info, sym, symname); | |
1590 | } | |
d1f25e66 | 1591 | if (!is_vmlinux(modname) || |
10668220 SR |
1592 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1593 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1594 | |
1595 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1596 | if (version) | |
1597 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1598 | version - (char *)info.hdr); | |
1599 | if (version || (all_versions && !is_vmlinux(modname))) | |
1600 | get_src_version(modname, mod->srcversion, | |
1601 | sizeof(mod->srcversion)-1); | |
1602 | ||
1603 | parse_elf_finish(&info); | |
1604 | ||
8c8ef42a | 1605 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1606 | * never passed as an argument to an exported function, so |
1607 | * the automatic versioning doesn't pick it up, but it's really | |
1608 | * important anyhow */ | |
1609 | if (modversions) | |
8c8ef42a | 1610 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | #define SZ 500 | |
1614 | ||
1615 | /* We first write the generated file into memory using the | |
1616 | * following helper, then compare to the file on disk and | |
1617 | * only update the later if anything changed */ | |
1618 | ||
5c3ead8c SR |
1619 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1620 | const char *fmt, ...) | |
1da177e4 LT |
1621 | { |
1622 | char tmp[SZ]; | |
1623 | int len; | |
1624 | va_list ap; | |
62070fa4 | 1625 | |
1da177e4 LT |
1626 | va_start(ap, fmt); |
1627 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1628 | buf_write(buf, tmp, len); |
1da177e4 LT |
1629 | va_end(ap); |
1630 | } | |
1631 | ||
5c3ead8c | 1632 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1633 | { |
1634 | if (buf->size - buf->pos < len) { | |
7670f023 | 1635 | buf->size += len + SZ; |
1da177e4 LT |
1636 | buf->p = realloc(buf->p, buf->size); |
1637 | } | |
1638 | strncpy(buf->p + buf->pos, s, len); | |
1639 | buf->pos += len; | |
1640 | } | |
1641 | ||
c96fca21 SR |
1642 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1643 | { | |
1644 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1645 | ||
1646 | switch (exp) { | |
1647 | case export_gpl: | |
1648 | fatal("modpost: GPL-incompatible module %s%s " | |
1649 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1650 | break; | |
1651 | case export_unused_gpl: | |
1652 | fatal("modpost: GPL-incompatible module %s%s " | |
1653 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1654 | break; | |
1655 | case export_gpl_future: | |
1656 | warn("modpost: GPL-incompatible module %s%s " | |
1657 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1658 | break; | |
1659 | case export_plain: | |
1660 | case export_unused: | |
1661 | case export_unknown: | |
1662 | /* ignore */ | |
1663 | break; | |
1664 | } | |
1665 | } | |
1666 | ||
df578e7d | 1667 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1668 | { |
1669 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1670 | ||
1671 | switch (exp) { | |
1672 | case export_unused: | |
1673 | case export_unused_gpl: | |
1674 | warn("modpost: module %s%s " | |
1675 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1676 | break; | |
1677 | default: | |
1678 | /* ignore */ | |
1679 | break; | |
1680 | } | |
1681 | } | |
1682 | ||
1683 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1684 | { |
1685 | struct symbol *s, *exp; | |
1686 | ||
1687 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1688 | const char *basename; |
b817f6fe SR |
1689 | exp = find_symbol(s->name); |
1690 | if (!exp || exp->module == mod) | |
1691 | continue; | |
6449bd62 | 1692 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1693 | if (basename) |
1694 | basename++; | |
c96fca21 SR |
1695 | else |
1696 | basename = mod->name; | |
1697 | if (!mod->gpl_compatible) | |
1698 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1699 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1700 | } |
b817f6fe SR |
1701 | } |
1702 | ||
5c3ead8c SR |
1703 | /** |
1704 | * Header for the generated file | |
1705 | **/ | |
1706 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1707 | { |
1708 | buf_printf(b, "#include <linux/module.h>\n"); | |
1709 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1710 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1711 | buf_printf(b, "\n"); | |
1712 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1713 | buf_printf(b, "\n"); | |
1da177e4 LT |
1714 | buf_printf(b, "struct module __this_module\n"); |
1715 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1716 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1717 | if (mod->has_init) |
1718 | buf_printf(b, " .init = init_module,\n"); | |
1719 | if (mod->has_cleanup) | |
1720 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1721 | " .exit = cleanup_module,\n" | |
1722 | "#endif\n"); | |
e61a1c1c | 1723 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1724 | buf_printf(b, "};\n"); |
1725 | } | |
1726 | ||
5c725138 | 1727 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1728 | { |
1729 | static const char *staging_dir = "drivers/staging"; | |
1730 | ||
1731 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1732 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1733 | } | |
1734 | ||
5c3ead8c SR |
1735 | /** |
1736 | * Record CRCs for unresolved symbols | |
1737 | **/ | |
c53ddacd | 1738 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1739 | { |
1740 | struct symbol *s, *exp; | |
c53ddacd | 1741 | int err = 0; |
1da177e4 LT |
1742 | |
1743 | for (s = mod->unres; s; s = s->next) { | |
1744 | exp = find_symbol(s->name); | |
1745 | if (!exp || exp->module == mod) { | |
c53ddacd | 1746 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1747 | if (warn_unresolved) { |
1748 | warn("\"%s\" [%s.ko] undefined!\n", | |
1749 | s->name, mod->name); | |
1750 | } else { | |
1751 | merror("\"%s\" [%s.ko] undefined!\n", | |
1752 | s->name, mod->name); | |
1753 | err = 1; | |
1754 | } | |
c53ddacd | 1755 | } |
1da177e4 LT |
1756 | continue; |
1757 | } | |
1758 | s->module = exp->module; | |
1759 | s->crc_valid = exp->crc_valid; | |
1760 | s->crc = exp->crc; | |
1761 | } | |
1762 | ||
1763 | if (!modversions) | |
c53ddacd | 1764 | return err; |
1da177e4 LT |
1765 | |
1766 | buf_printf(b, "\n"); | |
1767 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1768 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1769 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1770 | ||
1771 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1772 | if (!s->module) |
1da177e4 | 1773 | continue; |
1da177e4 | 1774 | if (!s->crc_valid) { |
cb80514d | 1775 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1776 | s->name, mod->name); |
1777 | continue; | |
1778 | } | |
1779 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1780 | } | |
1781 | ||
1782 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1783 | |
1784 | return err; | |
1da177e4 LT |
1785 | } |
1786 | ||
5c3ead8c SR |
1787 | static void add_depends(struct buffer *b, struct module *mod, |
1788 | struct module *modules) | |
1da177e4 LT |
1789 | { |
1790 | struct symbol *s; | |
1791 | struct module *m; | |
1792 | int first = 1; | |
1793 | ||
df578e7d | 1794 | for (m = modules; m; m = m->next) |
1da177e4 | 1795 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1796 | |
1797 | buf_printf(b, "\n"); | |
1798 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1799 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1800 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1801 | buf_printf(b, "\"depends="); | |
1802 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1803 | const char *p; |
1da177e4 LT |
1804 | if (!s->module) |
1805 | continue; | |
1806 | ||
1807 | if (s->module->seen) | |
1808 | continue; | |
1809 | ||
1810 | s->module->seen = 1; | |
df578e7d SR |
1811 | p = strrchr(s->module->name, '/'); |
1812 | if (p) | |
a61b2dfd SR |
1813 | p++; |
1814 | else | |
1815 | p = s->module->name; | |
1816 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1817 | first = 0; |
1818 | } | |
1819 | buf_printf(b, "\";\n"); | |
1820 | } | |
1821 | ||
5c3ead8c | 1822 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1823 | { |
1824 | if (mod->srcversion[0]) { | |
1825 | buf_printf(b, "\n"); | |
1826 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1827 | mod->srcversion); | |
1828 | } | |
1829 | } | |
1830 | ||
5c3ead8c | 1831 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1832 | { |
1833 | char *tmp; | |
1834 | FILE *file; | |
1835 | struct stat st; | |
1836 | ||
1837 | file = fopen(fname, "r"); | |
1838 | if (!file) | |
1839 | goto write; | |
1840 | ||
1841 | if (fstat(fileno(file), &st) < 0) | |
1842 | goto close_write; | |
1843 | ||
1844 | if (st.st_size != b->pos) | |
1845 | goto close_write; | |
1846 | ||
1847 | tmp = NOFAIL(malloc(b->pos)); | |
1848 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1849 | goto free_write; | |
1850 | ||
1851 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1852 | goto free_write; | |
1853 | ||
1854 | free(tmp); | |
1855 | fclose(file); | |
1856 | return; | |
1857 | ||
1858 | free_write: | |
1859 | free(tmp); | |
1860 | close_write: | |
1861 | fclose(file); | |
1862 | write: | |
1863 | file = fopen(fname, "w"); | |
1864 | if (!file) { | |
1865 | perror(fname); | |
1866 | exit(1); | |
1867 | } | |
1868 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1869 | perror(fname); | |
1870 | exit(1); | |
1871 | } | |
1872 | fclose(file); | |
1873 | } | |
1874 | ||
bd5cbced | 1875 | /* parse Module.symvers file. line format: |
534b89a9 | 1876 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1877 | **/ |
040fcc81 | 1878 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1879 | { |
1880 | unsigned long size, pos = 0; | |
1881 | void *file = grab_file(fname, &size); | |
1882 | char *line; | |
1883 | ||
df578e7d | 1884 | if (!file) |
1da177e4 LT |
1885 | /* No symbol versions, silently ignore */ |
1886 | return; | |
1887 | ||
1888 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1889 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1890 | unsigned int crc; |
1891 | struct module *mod; | |
040fcc81 | 1892 | struct symbol *s; |
1da177e4 LT |
1893 | |
1894 | if (!(symname = strchr(line, '\t'))) | |
1895 | goto fail; | |
1896 | *symname++ = '\0'; | |
1897 | if (!(modname = strchr(symname, '\t'))) | |
1898 | goto fail; | |
1899 | *modname++ = '\0'; | |
9ac545b0 | 1900 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1901 | *export++ = '\0'; |
534b89a9 SR |
1902 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1903 | *end = '\0'; | |
1da177e4 LT |
1904 | crc = strtoul(line, &d, 16); |
1905 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1906 | goto fail; | |
df578e7d SR |
1907 | mod = find_module(modname); |
1908 | if (!mod) { | |
1909 | if (is_vmlinux(modname)) | |
1da177e4 | 1910 | have_vmlinux = 1; |
0fa3a88c | 1911 | mod = new_module(modname); |
1da177e4 LT |
1912 | mod->skip = 1; |
1913 | } | |
bd5cbced | 1914 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1915 | s->kernel = kernel; |
1916 | s->preloaded = 1; | |
bd5cbced | 1917 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1918 | } |
1919 | return; | |
1920 | fail: | |
1921 | fatal("parse error in symbol dump file\n"); | |
1922 | } | |
1923 | ||
040fcc81 SR |
1924 | /* For normal builds always dump all symbols. |
1925 | * For external modules only dump symbols | |
1926 | * that are not read from kernel Module.symvers. | |
1927 | **/ | |
1928 | static int dump_sym(struct symbol *sym) | |
1929 | { | |
1930 | if (!external_module) | |
1931 | return 1; | |
1932 | if (sym->vmlinux || sym->kernel) | |
1933 | return 0; | |
1934 | return 1; | |
1935 | } | |
62070fa4 | 1936 | |
5c3ead8c | 1937 | static void write_dump(const char *fname) |
1da177e4 LT |
1938 | { |
1939 | struct buffer buf = { }; | |
1940 | struct symbol *symbol; | |
1941 | int n; | |
1942 | ||
1943 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1944 | symbol = symbolhash[n]; | |
1945 | while (symbol) { | |
040fcc81 | 1946 | if (dump_sym(symbol)) |
bd5cbced | 1947 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1948 | symbol->crc, symbol->name, |
bd5cbced RP |
1949 | symbol->module->name, |
1950 | export_str(symbol->export)); | |
1da177e4 LT |
1951 | symbol = symbol->next; |
1952 | } | |
1953 | } | |
1954 | write_if_changed(&buf, fname); | |
1955 | } | |
1956 | ||
2d04b5ae RH |
1957 | struct ext_sym_list { |
1958 | struct ext_sym_list *next; | |
1959 | const char *file; | |
1960 | }; | |
1961 | ||
5c3ead8c | 1962 | int main(int argc, char **argv) |
1da177e4 LT |
1963 | { |
1964 | struct module *mod; | |
1965 | struct buffer buf = { }; | |
040fcc81 SR |
1966 | char *kernel_read = NULL, *module_read = NULL; |
1967 | char *dump_write = NULL; | |
1da177e4 | 1968 | int opt; |
c53ddacd | 1969 | int err; |
2d04b5ae RH |
1970 | struct ext_sym_list *extsym_iter; |
1971 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 1972 | |
2d04b5ae | 1973 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d SR |
1974 | switch (opt) { |
1975 | case 'i': | |
1976 | kernel_read = optarg; | |
1977 | break; | |
1978 | case 'I': | |
1979 | module_read = optarg; | |
1980 | external_module = 1; | |
1981 | break; | |
4ce6efed SR |
1982 | case 'c': |
1983 | cross_build = 1; | |
1984 | break; | |
2d04b5ae RH |
1985 | case 'e': |
1986 | external_module = 1; | |
1987 | extsym_iter = | |
1988 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
1989 | extsym_iter->next = extsym_start; | |
1990 | extsym_iter->file = optarg; | |
1991 | extsym_start = extsym_iter; | |
1992 | break; | |
df578e7d SR |
1993 | case 'm': |
1994 | modversions = 1; | |
1995 | break; | |
1996 | case 'o': | |
1997 | dump_write = optarg; | |
1998 | break; | |
1999 | case 'a': | |
2000 | all_versions = 1; | |
2001 | break; | |
2002 | case 's': | |
2003 | vmlinux_section_warnings = 0; | |
2004 | break; | |
588ccd73 SR |
2005 | case 'S': |
2006 | sec_mismatch_verbose = 0; | |
2007 | break; | |
df578e7d SR |
2008 | case 'w': |
2009 | warn_unresolved = 1; | |
2010 | break; | |
2011 | default: | |
2012 | exit(1); | |
1da177e4 LT |
2013 | } |
2014 | } | |
2015 | ||
040fcc81 SR |
2016 | if (kernel_read) |
2017 | read_dump(kernel_read, 1); | |
2018 | if (module_read) | |
2019 | read_dump(module_read, 0); | |
2d04b5ae RH |
2020 | while (extsym_start) { |
2021 | read_dump(extsym_start->file, 0); | |
2022 | extsym_iter = extsym_start->next; | |
2023 | free(extsym_start); | |
2024 | extsym_start = extsym_iter; | |
2025 | } | |
1da177e4 | 2026 | |
df578e7d | 2027 | while (optind < argc) |
1da177e4 | 2028 | read_symbols(argv[optind++]); |
1da177e4 | 2029 | |
b817f6fe SR |
2030 | for (mod = modules; mod; mod = mod->next) { |
2031 | if (mod->skip) | |
2032 | continue; | |
c96fca21 | 2033 | check_exports(mod); |
b817f6fe SR |
2034 | } |
2035 | ||
c53ddacd KK |
2036 | err = 0; |
2037 | ||
1da177e4 | 2038 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2039 | char fname[strlen(mod->name) + 10]; |
2040 | ||
1da177e4 LT |
2041 | if (mod->skip) |
2042 | continue; | |
2043 | ||
2044 | buf.pos = 0; | |
2045 | ||
2046 | add_header(&buf, mod); | |
a9860bf0 | 2047 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2048 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2049 | add_depends(&buf, mod, modules); |
2050 | add_moddevtable(&buf, mod); | |
2051 | add_srcversion(&buf, mod); | |
2052 | ||
2053 | sprintf(fname, "%s.mod.c", mod->name); | |
2054 | write_if_changed(&buf, fname); | |
2055 | } | |
2056 | ||
2057 | if (dump_write) | |
2058 | write_dump(dump_write); | |
588ccd73 | 2059 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2060 | warn("modpost: Found %d section mismatch(es).\n" |
2061 | "To see full details build your kernel with:\n" | |
2062 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2063 | sec_mismatch_count); | |
1da177e4 | 2064 | |
c53ddacd | 2065 | return err; |
1da177e4 | 2066 | } |