Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
382168f4 | 5 | * Copyright 2006 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 | ||
14 | #include <ctype.h> | |
15 | #include "modpost.h" | |
b817f6fe | 16 | #include "../../include/linux/license.h" |
1da177e4 LT |
17 | |
18 | /* Are we using CONFIG_MODVERSIONS? */ | |
19 | int modversions = 0; | |
20 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
21 | int have_vmlinux = 0; | |
22 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
23 | static int all_versions = 0; | |
040fcc81 SR |
24 | /* If we are modposting external module set to 1 */ |
25 | static int external_module = 0; | |
c53ddacd KK |
26 | /* Only warn about unresolved symbols */ |
27 | static int warn_unresolved = 0; | |
bd5cbced | 28 | /* How a symbol is exported */ |
c96fca21 SR |
29 | enum export { |
30 | export_plain, export_unused, export_gpl, | |
31 | export_unused_gpl, export_gpl_future, export_unknown | |
32 | }; | |
1da177e4 | 33 | |
5c3ead8c | 34 | void fatal(const char *fmt, ...) |
1da177e4 LT |
35 | { |
36 | va_list arglist; | |
37 | ||
38 | fprintf(stderr, "FATAL: "); | |
39 | ||
40 | va_start(arglist, fmt); | |
41 | vfprintf(stderr, fmt, arglist); | |
42 | va_end(arglist); | |
43 | ||
44 | exit(1); | |
45 | } | |
46 | ||
5c3ead8c | 47 | void warn(const char *fmt, ...) |
1da177e4 LT |
48 | { |
49 | va_list arglist; | |
50 | ||
51 | fprintf(stderr, "WARNING: "); | |
52 | ||
53 | va_start(arglist, fmt); | |
54 | vfprintf(stderr, fmt, arglist); | |
55 | va_end(arglist); | |
56 | } | |
57 | ||
2a116659 MW |
58 | void merror(const char *fmt, ...) |
59 | { | |
60 | va_list arglist; | |
61 | ||
62 | fprintf(stderr, "ERROR: "); | |
63 | ||
64 | va_start(arglist, fmt); | |
65 | vfprintf(stderr, fmt, arglist); | |
66 | va_end(arglist); | |
67 | } | |
68 | ||
040fcc81 SR |
69 | static int is_vmlinux(const char *modname) |
70 | { | |
71 | const char *myname; | |
72 | ||
73 | if ((myname = strrchr(modname, '/'))) | |
74 | myname++; | |
75 | else | |
76 | myname = modname; | |
77 | ||
741f98fe SR |
78 | return (strcmp(myname, "vmlinux") == 0) || |
79 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
80 | } |
81 | ||
1da177e4 LT |
82 | void *do_nofail(void *ptr, const char *expr) |
83 | { | |
84 | if (!ptr) { | |
85 | fatal("modpost: Memory allocation failure: %s.\n", expr); | |
86 | } | |
87 | return ptr; | |
88 | } | |
89 | ||
90 | /* A list of all modules we processed */ | |
91 | ||
92 | static struct module *modules; | |
93 | ||
5c3ead8c | 94 | static struct module *find_module(char *modname) |
1da177e4 LT |
95 | { |
96 | struct module *mod; | |
97 | ||
98 | for (mod = modules; mod; mod = mod->next) | |
99 | if (strcmp(mod->name, modname) == 0) | |
100 | break; | |
101 | return mod; | |
102 | } | |
103 | ||
5c3ead8c | 104 | static struct module *new_module(char *modname) |
1da177e4 LT |
105 | { |
106 | struct module *mod; | |
107 | char *p, *s; | |
62070fa4 | 108 | |
1da177e4 LT |
109 | mod = NOFAIL(malloc(sizeof(*mod))); |
110 | memset(mod, 0, sizeof(*mod)); | |
111 | p = NOFAIL(strdup(modname)); | |
112 | ||
113 | /* strip trailing .o */ | |
114 | if ((s = strrchr(p, '.')) != NULL) | |
115 | if (strcmp(s, ".o") == 0) | |
116 | *s = '\0'; | |
117 | ||
118 | /* add to list */ | |
119 | mod->name = p; | |
b817f6fe | 120 | mod->gpl_compatible = -1; |
1da177e4 LT |
121 | mod->next = modules; |
122 | modules = mod; | |
123 | ||
124 | return mod; | |
125 | } | |
126 | ||
127 | /* A hash of all exported symbols, | |
128 | * struct symbol is also used for lists of unresolved symbols */ | |
129 | ||
130 | #define SYMBOL_HASH_SIZE 1024 | |
131 | ||
132 | struct symbol { | |
133 | struct symbol *next; | |
134 | struct module *module; | |
135 | unsigned int crc; | |
136 | int crc_valid; | |
137 | unsigned int weak:1; | |
040fcc81 SR |
138 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
139 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
140 | * (only for external modules) **/ | |
8e70c458 | 141 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 142 | enum export export; /* Type of export */ |
1da177e4 LT |
143 | char name[0]; |
144 | }; | |
145 | ||
146 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
147 | ||
148 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
149 | static inline unsigned int tdb_hash(const char *name) | |
150 | { | |
151 | unsigned value; /* Used to compute the hash value. */ | |
152 | unsigned i; /* Used to cycle through random values. */ | |
153 | ||
154 | /* Set the initial value from the key size. */ | |
155 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) | |
156 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); | |
157 | ||
158 | return (1103515243 * value + 12345); | |
159 | } | |
160 | ||
5c3ead8c SR |
161 | /** |
162 | * Allocate a new symbols for use in the hash of exported symbols or | |
163 | * the list of unresolved symbols per module | |
164 | **/ | |
165 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
166 | struct symbol *next) | |
1da177e4 LT |
167 | { |
168 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
169 | ||
170 | memset(s, 0, sizeof(*s)); | |
171 | strcpy(s->name, name); | |
172 | s->weak = weak; | |
173 | s->next = next; | |
174 | return s; | |
175 | } | |
176 | ||
177 | /* For the hash of exported symbols */ | |
bd5cbced RP |
178 | static struct symbol *new_symbol(const char *name, struct module *module, |
179 | enum export export) | |
1da177e4 LT |
180 | { |
181 | unsigned int hash; | |
182 | struct symbol *new; | |
183 | ||
184 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
185 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
186 | new->module = module; | |
bd5cbced | 187 | new->export = export; |
040fcc81 | 188 | return new; |
1da177e4 LT |
189 | } |
190 | ||
5c3ead8c | 191 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
192 | { |
193 | struct symbol *s; | |
194 | ||
195 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
196 | if (name[0] == '.') | |
197 | name++; | |
198 | ||
199 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { | |
200 | if (strcmp(s->name, name) == 0) | |
201 | return s; | |
202 | } | |
203 | return NULL; | |
204 | } | |
205 | ||
bd5cbced RP |
206 | static struct { |
207 | const char *str; | |
208 | enum export export; | |
209 | } export_list[] = { | |
210 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 211 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 212 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 213 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
214 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
215 | { .str = "(unknown)", .export = export_unknown }, | |
216 | }; | |
217 | ||
218 | ||
219 | static const char *export_str(enum export ex) | |
220 | { | |
221 | return export_list[ex].str; | |
222 | } | |
223 | ||
224 | static enum export export_no(const char * s) | |
225 | { | |
226 | int i; | |
534b89a9 SR |
227 | if (!s) |
228 | return export_unknown; | |
bd5cbced RP |
229 | for (i = 0; export_list[i].export != export_unknown; i++) { |
230 | if (strcmp(export_list[i].str, s) == 0) | |
231 | return export_list[i].export; | |
232 | } | |
233 | return export_unknown; | |
234 | } | |
235 | ||
236 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
237 | { | |
238 | if (sec == elf->export_sec) | |
239 | return export_plain; | |
c96fca21 SR |
240 | else if (sec == elf->export_unused_sec) |
241 | return export_unused; | |
bd5cbced RP |
242 | else if (sec == elf->export_gpl_sec) |
243 | return export_gpl; | |
c96fca21 SR |
244 | else if (sec == elf->export_unused_gpl_sec) |
245 | return export_unused_gpl; | |
bd5cbced RP |
246 | else if (sec == elf->export_gpl_future_sec) |
247 | return export_gpl_future; | |
248 | else | |
249 | return export_unknown; | |
250 | } | |
251 | ||
5c3ead8c SR |
252 | /** |
253 | * Add an exported symbol - it may have already been added without a | |
254 | * CRC, in this case just update the CRC | |
255 | **/ | |
bd5cbced RP |
256 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
257 | enum export export) | |
1da177e4 LT |
258 | { |
259 | struct symbol *s = find_symbol(name); | |
260 | ||
261 | if (!s) { | |
bd5cbced | 262 | s = new_symbol(name, mod, export); |
8e70c458 SR |
263 | } else { |
264 | if (!s->preloaded) { | |
7b75b13c | 265 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
266 | "was in %s%s\n", mod->name, name, |
267 | s->module->name, | |
268 | is_vmlinux(s->module->name) ?"":".ko"); | |
269 | } | |
1da177e4 | 270 | } |
8e70c458 | 271 | s->preloaded = 0; |
040fcc81 SR |
272 | s->vmlinux = is_vmlinux(mod->name); |
273 | s->kernel = 0; | |
bd5cbced | 274 | s->export = export; |
040fcc81 SR |
275 | return s; |
276 | } | |
277 | ||
278 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 279 | unsigned int crc, enum export export) |
040fcc81 SR |
280 | { |
281 | struct symbol *s = find_symbol(name); | |
282 | ||
283 | if (!s) | |
bd5cbced | 284 | s = new_symbol(name, mod, export); |
040fcc81 SR |
285 | s->crc = crc; |
286 | s->crc_valid = 1; | |
1da177e4 LT |
287 | } |
288 | ||
5c3ead8c | 289 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
290 | { |
291 | struct stat st; | |
292 | void *map; | |
293 | int fd; | |
294 | ||
295 | fd = open(filename, O_RDONLY); | |
296 | if (fd < 0 || fstat(fd, &st) != 0) | |
297 | return NULL; | |
298 | ||
299 | *size = st.st_size; | |
300 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
301 | close(fd); | |
302 | ||
303 | if (map == MAP_FAILED) | |
304 | return NULL; | |
305 | return map; | |
306 | } | |
307 | ||
5c3ead8c SR |
308 | /** |
309 | * Return a copy of the next line in a mmap'ed file. | |
310 | * spaces in the beginning of the line is trimmed away. | |
311 | * Return a pointer to a static buffer. | |
312 | **/ | |
313 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) | |
1da177e4 LT |
314 | { |
315 | static char line[4096]; | |
316 | int skip = 1; | |
317 | size_t len = 0; | |
318 | signed char *p = (signed char *)file + *pos; | |
319 | char *s = line; | |
320 | ||
321 | for (; *pos < size ; (*pos)++) | |
322 | { | |
323 | if (skip && isspace(*p)) { | |
324 | p++; | |
325 | continue; | |
326 | } | |
327 | skip = 0; | |
328 | if (*p != '\n' && (*pos < size)) { | |
329 | len++; | |
330 | *s++ = *p++; | |
331 | if (len > 4095) | |
332 | break; /* Too long, stop */ | |
333 | } else { | |
334 | /* End of string */ | |
335 | *s = '\0'; | |
336 | return line; | |
337 | } | |
338 | } | |
339 | /* End of buffer */ | |
340 | return NULL; | |
341 | } | |
342 | ||
5c3ead8c | 343 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
344 | { |
345 | munmap(file, size); | |
346 | } | |
347 | ||
85bd2fdd | 348 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
349 | { |
350 | unsigned int i; | |
85bd2fdd | 351 | Elf_Ehdr *hdr; |
1da177e4 LT |
352 | Elf_Shdr *sechdrs; |
353 | Elf_Sym *sym; | |
354 | ||
355 | hdr = grab_file(filename, &info->size); | |
356 | if (!hdr) { | |
357 | perror(filename); | |
6803dc0e | 358 | exit(1); |
1da177e4 LT |
359 | } |
360 | info->hdr = hdr; | |
85bd2fdd SR |
361 | if (info->size < sizeof(*hdr)) { |
362 | /* file too small, assume this is an empty .o file */ | |
363 | return 0; | |
364 | } | |
365 | /* Is this a valid ELF file? */ | |
366 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
367 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
368 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
369 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
370 | /* Not an ELF file - silently ignore it */ | |
371 | return 0; | |
372 | } | |
1da177e4 LT |
373 | /* Fix endianness in ELF header */ |
374 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
375 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
376 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
377 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
ae4ac123 | 378 | hdr->e_type = TO_NATIVE(hdr->e_type); |
1da177e4 LT |
379 | sechdrs = (void *)hdr + hdr->e_shoff; |
380 | info->sechdrs = sechdrs; | |
381 | ||
382 | /* Fix endianness in section headers */ | |
383 | for (i = 0; i < hdr->e_shnum; i++) { | |
384 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
385 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
386 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
387 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
388 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
ae4ac123 AN |
389 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); |
390 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
1da177e4 LT |
391 | } |
392 | /* Find symbol table. */ | |
393 | for (i = 1; i < hdr->e_shnum; i++) { | |
394 | const char *secstrings | |
395 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 396 | const char *secname; |
1da177e4 | 397 | |
85bd2fdd SR |
398 | if (sechdrs[i].sh_offset > info->size) { |
399 | fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr)); | |
400 | return 0; | |
401 | } | |
bd5cbced RP |
402 | secname = secstrings + sechdrs[i].sh_name; |
403 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
404 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
405 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
406 | } else if (strcmp(secname, "__ksymtab") == 0) |
407 | info->export_sec = i; | |
c96fca21 SR |
408 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
409 | info->export_unused_sec = i; | |
bd5cbced RP |
410 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
411 | info->export_gpl_sec = i; | |
c96fca21 SR |
412 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
413 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
414 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
415 | info->export_gpl_future_sec = i; | |
416 | ||
1da177e4 LT |
417 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
418 | continue; | |
419 | ||
420 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 421 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 422 | + sechdrs[i].sh_size; |
62070fa4 | 423 | info->strtab = (void *)hdr + |
1da177e4 LT |
424 | sechdrs[sechdrs[i].sh_link].sh_offset; |
425 | } | |
426 | if (!info->symtab_start) { | |
cb80514d | 427 | fatal("%s has no symtab?\n", filename); |
1da177e4 LT |
428 | } |
429 | /* Fix endianness in symbols */ | |
430 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
431 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
432 | sym->st_name = TO_NATIVE(sym->st_name); | |
433 | sym->st_value = TO_NATIVE(sym->st_value); | |
434 | sym->st_size = TO_NATIVE(sym->st_size); | |
435 | } | |
85bd2fdd | 436 | return 1; |
1da177e4 LT |
437 | } |
438 | ||
5c3ead8c | 439 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
440 | { |
441 | release_file(info->hdr, info->size); | |
442 | } | |
443 | ||
f7b05e64 LY |
444 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
445 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 446 | |
5c3ead8c SR |
447 | static void handle_modversions(struct module *mod, struct elf_info *info, |
448 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
449 | { |
450 | unsigned int crc; | |
bd5cbced | 451 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
452 | |
453 | switch (sym->st_shndx) { | |
454 | case SHN_COMMON: | |
cb80514d | 455 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
456 | break; |
457 | case SHN_ABS: | |
458 | /* CRC'd symbol */ | |
459 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
460 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
461 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
462 | export); | |
1da177e4 LT |
463 | } |
464 | break; | |
465 | case SHN_UNDEF: | |
466 | /* undefined symbol */ | |
467 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
468 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
469 | break; | |
470 | /* ignore global offset table */ | |
471 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
472 | break; | |
473 | /* ignore __this_module, it will be resolved shortly */ | |
474 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
475 | break; | |
8d529014 BC |
476 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
477 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
478 | /* add compatibility with older glibc */ | |
479 | #ifndef STT_SPARC_REGISTER | |
480 | #define STT_SPARC_REGISTER STT_REGISTER | |
481 | #endif | |
1da177e4 LT |
482 | if (info->hdr->e_machine == EM_SPARC || |
483 | info->hdr->e_machine == EM_SPARCV9) { | |
484 | /* Ignore register directives. */ | |
8d529014 | 485 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 486 | break; |
62070fa4 SR |
487 | if (symname[0] == '.') { |
488 | char *munged = strdup(symname); | |
489 | munged[0] = '_'; | |
490 | munged[1] = toupper(munged[1]); | |
491 | symname = munged; | |
492 | } | |
1da177e4 LT |
493 | } |
494 | #endif | |
62070fa4 | 495 | |
1da177e4 LT |
496 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
497 | strlen(MODULE_SYMBOL_PREFIX)) == 0) | |
498 | mod->unres = alloc_symbol(symname + | |
499 | strlen(MODULE_SYMBOL_PREFIX), | |
500 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
501 | mod->unres); | |
502 | break; | |
503 | default: | |
504 | /* All exported symbols */ | |
505 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
506 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
507 | export); | |
1da177e4 LT |
508 | } |
509 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
510 | mod->has_init = 1; | |
511 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
512 | mod->has_cleanup = 1; | |
513 | break; | |
514 | } | |
515 | } | |
516 | ||
5c3ead8c SR |
517 | /** |
518 | * Parse tag=value strings from .modinfo section | |
519 | **/ | |
1da177e4 LT |
520 | static char *next_string(char *string, unsigned long *secsize) |
521 | { | |
522 | /* Skip non-zero chars */ | |
523 | while (string[0]) { | |
524 | string++; | |
525 | if ((*secsize)-- <= 1) | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | /* Skip any zero padding. */ | |
530 | while (!string[0]) { | |
531 | string++; | |
532 | if ((*secsize)-- <= 1) | |
533 | return NULL; | |
534 | } | |
535 | return string; | |
536 | } | |
537 | ||
b817f6fe SR |
538 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
539 | const char *tag, char *info) | |
1da177e4 LT |
540 | { |
541 | char *p; | |
542 | unsigned int taglen = strlen(tag); | |
543 | unsigned long size = modinfo_len; | |
544 | ||
b817f6fe SR |
545 | if (info) { |
546 | size -= info - (char *)modinfo; | |
547 | modinfo = next_string(info, &size); | |
548 | } | |
549 | ||
1da177e4 LT |
550 | for (p = modinfo; p; p = next_string(p, &size)) { |
551 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
552 | return p + taglen + 1; | |
553 | } | |
554 | return NULL; | |
555 | } | |
556 | ||
b817f6fe SR |
557 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
558 | const char *tag) | |
559 | ||
560 | { | |
561 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
562 | } | |
563 | ||
4c8fbca5 SR |
564 | /** |
565 | * Test if string s ends in string sub | |
566 | * return 0 if match | |
567 | **/ | |
568 | static int strrcmp(const char *s, const char *sub) | |
569 | { | |
570 | int slen, sublen; | |
62070fa4 | 571 | |
4c8fbca5 SR |
572 | if (!s || !sub) |
573 | return 1; | |
62070fa4 | 574 | |
4c8fbca5 SR |
575 | slen = strlen(s); |
576 | sublen = strlen(sub); | |
62070fa4 | 577 | |
4c8fbca5 SR |
578 | if ((slen == 0) || (sublen == 0)) |
579 | return 1; | |
580 | ||
581 | if (sublen > slen) | |
582 | return 1; | |
583 | ||
584 | return memcmp(s + slen - sublen, sub, sublen); | |
585 | } | |
586 | ||
587 | /** | |
588 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e SR |
589 | * |
590 | * Pattern 0: | |
591 | * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. | |
592 | * The pattern is identified by: | |
593 | * fromsec = .text.init.refok | .data.init.refok | |
594 | * | |
4c8fbca5 SR |
595 | * Pattern 1: |
596 | * If a module parameter is declared __initdata and permissions=0 | |
597 | * then this is legal despite the warning generated. | |
598 | * We cannot see value of permissions here, so just ignore | |
599 | * this pattern. | |
600 | * The pattern is identified by: | |
601 | * tosec = .init.data | |
9209aed0 | 602 | * fromsec = .data* |
4c8fbca5 | 603 | * atsym =__param* |
62070fa4 | 604 | * |
4c8fbca5 | 605 | * Pattern 2: |
72ee59b5 | 606 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
607 | * add, remove, probe functions etc. |
608 | * These functions may often be marked __init and we do not want to | |
609 | * warn here. | |
610 | * the pattern is identified by: | |
5ecdd0f6 | 611 | * tosec = .init.text | .exit.text | .init.data |
a5eb6a50 | 612 | * fromsec = .data | .data.rel | .data.rel.* |
1e29a706 | 613 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console, *_timer |
ee6a8545 VG |
614 | * |
615 | * Pattern 3: | |
9bf8cb9b SR |
616 | * Whitelist all refereces from .text.head to .init.data |
617 | * Whitelist all refereces from .text.head to .init.text | |
618 | * | |
1d8af559 | 619 | * Pattern 4: |
ee6a8545 VG |
620 | * Some symbols belong to init section but still it is ok to reference |
621 | * these from non-init sections as these symbols don't have any memory | |
622 | * allocated for them and symbol address and value are same. So even | |
623 | * if init section is freed, its ok to reference those symbols. | |
624 | * For ex. symbols marking the init section boundaries. | |
625 | * This pattern is identified by | |
626 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 627 | * |
4c8fbca5 | 628 | **/ |
9e157a5a | 629 | static int secref_whitelist(const char *modname, const char *tosec, |
ee6a8545 VG |
630 | const char *fromsec, const char *atsym, |
631 | const char *refsymname) | |
4c8fbca5 SR |
632 | { |
633 | int f1 = 1, f2 = 1; | |
634 | const char **s; | |
635 | const char *pat2sym[] = { | |
72ee59b5 | 636 | "driver", |
5ecdd0f6 | 637 | "_template", /* scsi uses *_template a lot */ |
1e29a706 | 638 | "_timer", /* arm uses ops structures named _timer a lot */ |
5ecdd0f6 | 639 | "_sht", /* scsi also used *_sht to some extent */ |
4c8fbca5 SR |
640 | "_ops", |
641 | "_probe", | |
642 | "_probe_one", | |
118c0ace | 643 | "_console", |
4c8fbca5 SR |
644 | NULL |
645 | }; | |
62070fa4 | 646 | |
ee6a8545 VG |
647 | const char *pat3refsym[] = { |
648 | "__init_begin", | |
649 | "_sinittext", | |
650 | "_einittext", | |
651 | NULL | |
652 | }; | |
653 | ||
0e0d314e SR |
654 | /* Check for pattern 0 */ |
655 | if ((strcmp(fromsec, ".text.init.refok") == 0) || | |
656 | (strcmp(fromsec, ".data.init.refok") == 0)) | |
657 | return 1; | |
658 | ||
4c8fbca5 SR |
659 | /* Check for pattern 1 */ |
660 | if (strcmp(tosec, ".init.data") != 0) | |
661 | f1 = 0; | |
9209aed0 | 662 | if (strncmp(fromsec, ".data", strlen(".data")) != 0) |
4c8fbca5 SR |
663 | f1 = 0; |
664 | if (strncmp(atsym, "__param", strlen("__param")) != 0) | |
665 | f1 = 0; | |
666 | ||
667 | if (f1) | |
668 | return f1; | |
669 | ||
670 | /* Check for pattern 2 */ | |
62070fa4 | 671 | if ((strcmp(tosec, ".init.text") != 0) && |
5ecdd0f6 SR |
672 | (strcmp(tosec, ".exit.text") != 0) && |
673 | (strcmp(tosec, ".init.data") != 0)) | |
4c8fbca5 | 674 | f2 = 0; |
a5eb6a50 JB |
675 | if ((strcmp(fromsec, ".data") != 0) && |
676 | (strcmp(fromsec, ".data.rel") != 0) && | |
677 | (strncmp(fromsec, ".data.rel.", strlen(".data.rel.")) != 0)) | |
4c8fbca5 SR |
678 | f2 = 0; |
679 | ||
680 | for (s = pat2sym; *s; s++) | |
681 | if (strrcmp(atsym, *s) == 0) | |
682 | f1 = 1; | |
9e157a5a MD |
683 | if (f1 && f2) |
684 | return 1; | |
4c8fbca5 | 685 | |
9bf8cb9b | 686 | /* Check for pattern 3 */ |
9bf8cb9b SR |
687 | if ((strcmp(fromsec, ".text.head") == 0) && |
688 | ((strcmp(tosec, ".init.data") == 0) || | |
689 | (strcmp(tosec, ".init.text") == 0))) | |
690 | return 1; | |
691 | ||
1d8af559 | 692 | /* Check for pattern 4 */ |
9bf8cb9b SR |
693 | for (s = pat3refsym; *s; s++) |
694 | if (strcmp(refsymname, *s) == 0) | |
695 | return 1; | |
696 | ||
93659af1 | 697 | return 0; |
4c8fbca5 SR |
698 | } |
699 | ||
93684d3b SR |
700 | /** |
701 | * Find symbol based on relocation record info. | |
702 | * In some cases the symbol supplied is a valid symbol so | |
703 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
704 | * In other cases the symbol needs to be looked up in the symbol table | |
705 | * based on section and address. | |
706 | * **/ | |
707 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
708 | Elf_Sym *relsym) | |
709 | { | |
710 | Elf_Sym *sym; | |
711 | ||
712 | if (relsym->st_name != 0) | |
713 | return relsym; | |
714 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
715 | if (sym->st_shndx != relsym->st_shndx) | |
716 | continue; | |
ae4ac123 AN |
717 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
718 | continue; | |
93684d3b SR |
719 | if (sym->st_value == addr) |
720 | return sym; | |
721 | } | |
722 | return NULL; | |
723 | } | |
724 | ||
da68d61f DB |
725 | static inline int is_arm_mapping_symbol(const char *str) |
726 | { | |
727 | return str[0] == '$' && strchr("atd", str[1]) | |
728 | && (str[2] == '\0' || str[2] == '.'); | |
729 | } | |
730 | ||
731 | /* | |
732 | * If there's no name there, ignore it; likewise, ignore it if it's | |
733 | * one of the magic symbols emitted used by current ARM tools. | |
734 | * | |
735 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
736 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
737 | * only by merging __exit and __init sections into __text, bloating | |
738 | * the kernel (which is especially evil on embedded platforms). | |
739 | */ | |
740 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
741 | { | |
742 | const char *name = elf->strtab + sym->st_name; | |
743 | ||
744 | if (!name || !strlen(name)) | |
745 | return 0; | |
746 | return !is_arm_mapping_symbol(name); | |
747 | } | |
748 | ||
b39927cf | 749 | /* |
43c74d17 SR |
750 | * Find symbols before or equal addr and after addr - in the section sec. |
751 | * If we find two symbols with equal offset prefer one with a valid name. | |
752 | * The ELF format may have a better way to detect what type of symbol | |
753 | * it is, but this works for now. | |
b39927cf SR |
754 | **/ |
755 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
756 | const char *sec, | |
757 | Elf_Sym **before, Elf_Sym **after) | |
758 | { | |
759 | Elf_Sym *sym; | |
760 | Elf_Ehdr *hdr = elf->hdr; | |
761 | Elf_Addr beforediff = ~0; | |
762 | Elf_Addr afterdiff = ~0; | |
763 | const char *secstrings = (void *)hdr + | |
764 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 765 | |
b39927cf SR |
766 | *before = NULL; |
767 | *after = NULL; | |
768 | ||
769 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
770 | const char *symsec; | |
771 | ||
772 | if (sym->st_shndx >= SHN_LORESERVE) | |
773 | continue; | |
774 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
775 | if (strcmp(symsec, sec) != 0) | |
776 | continue; | |
da68d61f DB |
777 | if (!is_valid_name(elf, sym)) |
778 | continue; | |
b39927cf SR |
779 | if (sym->st_value <= addr) { |
780 | if ((addr - sym->st_value) < beforediff) { | |
781 | beforediff = addr - sym->st_value; | |
782 | *before = sym; | |
783 | } | |
43c74d17 | 784 | else if ((addr - sym->st_value) == beforediff) { |
da68d61f | 785 | *before = sym; |
43c74d17 | 786 | } |
b39927cf SR |
787 | } |
788 | else | |
789 | { | |
790 | if ((sym->st_value - addr) < afterdiff) { | |
791 | afterdiff = sym->st_value - addr; | |
792 | *after = sym; | |
793 | } | |
43c74d17 | 794 | else if ((sym->st_value - addr) == afterdiff) { |
da68d61f | 795 | *after = sym; |
43c74d17 | 796 | } |
b39927cf SR |
797 | } |
798 | } | |
799 | } | |
800 | ||
801 | /** | |
802 | * Print a warning about a section mismatch. | |
803 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 804 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
805 | **/ |
806 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
807 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
808 | { | |
93684d3b SR |
809 | const char *refsymname = ""; |
810 | Elf_Sym *before, *after; | |
811 | Elf_Sym *refsym; | |
b39927cf SR |
812 | Elf_Ehdr *hdr = elf->hdr; |
813 | Elf_Shdr *sechdrs = elf->sechdrs; | |
814 | const char *secstrings = (void *)hdr + | |
815 | sechdrs[hdr->e_shstrndx].sh_offset; | |
816 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 817 | |
b39927cf SR |
818 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
819 | ||
93684d3b SR |
820 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
821 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
822 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
823 | |
824 | /* check whitelist - we may ignore it */ | |
62070fa4 | 825 | if (before && |
9e157a5a | 826 | secref_whitelist(modname, secname, fromsec, |
ee6a8545 | 827 | elf->strtab + before->st_name, refsymname)) |
4c8fbca5 | 828 | return; |
62070fa4 | 829 | |
b39927cf | 830 | if (before && after) { |
25601209 RK |
831 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
832 | "(between '%s' and '%s')\n", | |
833 | modname, fromsec, (unsigned long long)r.r_offset, | |
834 | secname, refsymname, | |
b39927cf | 835 | elf->strtab + before->st_name, |
b39927cf SR |
836 | elf->strtab + after->st_name); |
837 | } else if (before) { | |
25601209 RK |
838 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
839 | "(after '%s')\n", | |
840 | modname, fromsec, (unsigned long long)r.r_offset, | |
841 | secname, refsymname, | |
842 | elf->strtab + before->st_name); | |
b39927cf | 843 | } else if (after) { |
25601209 | 844 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
93684d3b | 845 | "before '%s' (at offset -0x%llx)\n", |
25601209 RK |
846 | modname, fromsec, (unsigned long long)r.r_offset, |
847 | secname, refsymname, | |
848 | elf->strtab + after->st_name); | |
b39927cf | 849 | } else { |
25601209 RK |
850 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n", |
851 | modname, fromsec, (unsigned long long)r.r_offset, | |
852 | secname, refsymname); | |
b39927cf SR |
853 | } |
854 | } | |
855 | ||
ae4ac123 AN |
856 | static unsigned int *reloc_location(struct elf_info *elf, |
857 | int rsection, Elf_Rela *r) | |
858 | { | |
859 | Elf_Shdr *sechdrs = elf->sechdrs; | |
860 | int section = sechdrs[rsection].sh_info; | |
861 | ||
862 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
863 | (r->r_offset - sechdrs[section].sh_addr); | |
864 | } | |
865 | ||
866 | static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r) | |
867 | { | |
868 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
869 | unsigned int *location = reloc_location(elf, rsection, r); | |
870 | ||
871 | switch (r_typ) { | |
872 | case R_386_32: | |
873 | r->r_addend = TO_NATIVE(*location); | |
874 | break; | |
875 | case R_386_PC32: | |
876 | r->r_addend = TO_NATIVE(*location) + 4; | |
877 | /* For CONFIG_RELOCATABLE=y */ | |
878 | if (elf->hdr->e_type == ET_EXEC) | |
879 | r->r_addend += r->r_offset; | |
880 | break; | |
881 | } | |
882 | return 0; | |
883 | } | |
884 | ||
56a974fa SR |
885 | static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
886 | { | |
887 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
888 | ||
889 | switch (r_typ) { | |
890 | case R_ARM_ABS32: | |
891 | /* From ARM ABI: (S + A) | T */ | |
892 | r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info)); | |
893 | break; | |
894 | case R_ARM_PC24: | |
895 | /* From ARM ABI: ((S + A) | T) - P */ | |
896 | r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset + | |
897 | (r->r_offset - elf->sechdrs[rsection].sh_addr)); | |
898 | break; | |
899 | default: | |
900 | return 1; | |
901 | } | |
902 | return 0; | |
903 | } | |
904 | ||
ae4ac123 AN |
905 | static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
906 | { | |
907 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
908 | unsigned int *location = reloc_location(elf, rsection, r); | |
909 | unsigned int inst; | |
910 | ||
911 | if (r_typ == R_MIPS_HI16) | |
912 | return 1; /* skip this */ | |
913 | inst = TO_NATIVE(*location); | |
914 | switch (r_typ) { | |
915 | case R_MIPS_LO16: | |
916 | r->r_addend = inst & 0xffff; | |
917 | break; | |
918 | case R_MIPS_26: | |
919 | r->r_addend = (inst & 0x03ffffff) << 2; | |
920 | break; | |
921 | case R_MIPS_32: | |
922 | r->r_addend = inst; | |
923 | break; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | ||
b39927cf SR |
928 | /** |
929 | * A module includes a number of sections that are discarded | |
930 | * either when loaded or when used as built-in. | |
931 | * For loaded modules all functions marked __init and all data | |
932 | * marked __initdata will be discarded when the module has been intialized. | |
933 | * Likewise for modules used built-in the sections marked __exit | |
934 | * are discarded because __exit marked function are supposed to be called | |
935 | * only when a moduel is unloaded which never happes for built-in modules. | |
936 | * The check_sec_ref() function traverses all relocation records | |
937 | * to find all references to a section that reference a section that will | |
938 | * be discarded and warns about it. | |
939 | **/ | |
940 | static void check_sec_ref(struct module *mod, const char *modname, | |
941 | struct elf_info *elf, | |
942 | int section(const char*), | |
943 | int section_ref_ok(const char *)) | |
944 | { | |
945 | int i; | |
946 | Elf_Sym *sym; | |
947 | Elf_Ehdr *hdr = elf->hdr; | |
948 | Elf_Shdr *sechdrs = elf->sechdrs; | |
949 | const char *secstrings = (void *)hdr + | |
950 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 951 | |
b39927cf SR |
952 | /* Walk through all sections */ |
953 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
954 | const char *name = secstrings + sechdrs[i].sh_name; |
955 | const char *secname; | |
956 | Elf_Rela r; | |
eae07ac6 | 957 | unsigned int r_sym; |
b39927cf | 958 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
959 | if (sechdrs[i].sh_type == SHT_RELA) { |
960 | Elf_Rela *rela; | |
961 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
962 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
963 | name += strlen(".rela"); | |
964 | if (section_ref_ok(name)) | |
965 | continue; | |
b39927cf | 966 | |
2c1a51f3 AN |
967 | for (rela = start; rela < stop; rela++) { |
968 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
969 | #if KERNEL_ELFCLASS == ELFCLASS64 |
970 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 971 | unsigned int r_typ; |
eae07ac6 AN |
972 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
973 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
974 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); |
975 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
976 | } else { |
977 | r.r_info = TO_NATIVE(rela->r_info); | |
978 | r_sym = ELF_R_SYM(r.r_info); | |
979 | } | |
980 | #else | |
981 | r.r_info = TO_NATIVE(rela->r_info); | |
982 | r_sym = ELF_R_SYM(r.r_info); | |
983 | #endif | |
2c1a51f3 | 984 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 985 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
986 | /* Skip special sections */ |
987 | if (sym->st_shndx >= SHN_LORESERVE) | |
988 | continue; | |
989 | ||
990 | secname = secstrings + | |
991 | sechdrs[sym->st_shndx].sh_name; | |
992 | if (section(secname)) | |
993 | warn_sec_mismatch(modname, name, | |
994 | elf, sym, r); | |
995 | } | |
996 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
997 | Elf_Rel *rel; | |
998 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
999 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
1000 | name += strlen(".rel"); | |
1001 | if (section_ref_ok(name)) | |
b39927cf SR |
1002 | continue; |
1003 | ||
2c1a51f3 AN |
1004 | for (rel = start; rel < stop; rel++) { |
1005 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
1006 | #if KERNEL_ELFCLASS == ELFCLASS64 |
1007 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 1008 | unsigned int r_typ; |
eae07ac6 AN |
1009 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
1010 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
1011 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); |
1012 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
1013 | } else { |
1014 | r.r_info = TO_NATIVE(rel->r_info); | |
1015 | r_sym = ELF_R_SYM(r.r_info); | |
1016 | } | |
1017 | #else | |
1018 | r.r_info = TO_NATIVE(rel->r_info); | |
1019 | r_sym = ELF_R_SYM(r.r_info); | |
1020 | #endif | |
2c1a51f3 | 1021 | r.r_addend = 0; |
ae4ac123 AN |
1022 | switch (hdr->e_machine) { |
1023 | case EM_386: | |
1024 | if (addend_386_rel(elf, i, &r)) | |
1025 | continue; | |
1026 | break; | |
56a974fa SR |
1027 | case EM_ARM: |
1028 | if(addend_arm_rel(elf, i, &r)) | |
1029 | continue; | |
1030 | break; | |
ae4ac123 AN |
1031 | case EM_MIPS: |
1032 | if (addend_mips_rel(elf, i, &r)) | |
1033 | continue; | |
1034 | break; | |
1035 | } | |
eae07ac6 | 1036 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
1037 | /* Skip special sections */ |
1038 | if (sym->st_shndx >= SHN_LORESERVE) | |
1039 | continue; | |
1040 | ||
1041 | secname = secstrings + | |
1042 | sechdrs[sym->st_shndx].sh_name; | |
1043 | if (section(secname)) | |
1044 | warn_sec_mismatch(modname, name, | |
1045 | elf, sym, r); | |
1046 | } | |
b39927cf SR |
1047 | } |
1048 | } | |
1049 | } | |
1050 | ||
1087247b SR |
1051 | /* |
1052 | * Identify sections from which references to either a | |
1053 | * .init or a .exit section is OK. | |
1054 | * | |
1055 | * [OPD] Keith Ownes <kaos@sgi.com> commented: | |
1056 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
1057 | * section, not the ia64 .opd section. | |
1058 | * ia64 .opd should not point to discarded sections. | |
1059 | * [.rodata] like for .init.text we ignore .rodata references -same reason | |
1d8af559 | 1060 | */ |
1087247b SR |
1061 | static int initexit_section_ref_ok(const char *name) |
1062 | { | |
1063 | const char **s; | |
1064 | /* Absolute section names */ | |
1065 | const char *namelist1[] = { | |
1066 | "__bug_table", /* used by powerpc for BUG() */ | |
1067 | "__ex_table", | |
1068 | ".altinstructions", | |
1069 | ".cranges", /* used by sh64 */ | |
1070 | ".fixup", | |
1d8af559 SR |
1071 | ".machvec", /* ia64 + powerpc uses these */ |
1072 | ".machine.desc", | |
1087247b SR |
1073 | ".opd", /* See comment [OPD] */ |
1074 | ".parainstructions", | |
1075 | ".pdr", | |
1076 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ | |
1077 | ".smp_locks", | |
1078 | ".stab", | |
3a5df1d4 | 1079 | ".m68k_fixup", |
1087247b SR |
1080 | NULL |
1081 | }; | |
1082 | /* Start of section names */ | |
1083 | const char *namelist2[] = { | |
1084 | ".debug", | |
1085 | ".eh_frame", | |
1086 | ".note", /* ignore ELF notes - may contain anything */ | |
1087 | ".got", /* powerpc - global offset table */ | |
1088 | ".toc", /* powerpc - table of contents */ | |
1089 | NULL | |
1090 | }; | |
1091 | /* part of section name */ | |
1092 | const char *namelist3 [] = { | |
1093 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
1094 | NULL | |
1095 | }; | |
1096 | ||
1097 | for (s = namelist1; *s; s++) | |
1098 | if (strcmp(*s, name) == 0) | |
1099 | return 1; | |
1100 | for (s = namelist2; *s; s++) | |
1101 | if (strncmp(*s, name, strlen(*s)) == 0) | |
1102 | return 1; | |
1103 | for (s = namelist3; *s; s++) | |
1104 | if (strstr(name, *s) != NULL) | |
1105 | return 1; | |
1106 | return 0; | |
1107 | } | |
1108 | ||
b39927cf SR |
1109 | /** |
1110 | * Functions used only during module init is marked __init and is stored in | |
1111 | * a .init.text section. Likewise data is marked __initdata and stored in | |
1112 | * a .init.data section. | |
1113 | * If this section is one of these sections return 1 | |
1114 | * See include/linux/init.h for the details | |
1115 | **/ | |
1116 | static int init_section(const char *name) | |
1117 | { | |
1118 | if (strcmp(name, ".init") == 0) | |
1119 | return 1; | |
1120 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
1121 | return 1; | |
1122 | return 0; | |
1123 | } | |
1124 | ||
1087247b | 1125 | /* |
b39927cf | 1126 | * Identify sections from which references to a .init section is OK. |
62070fa4 | 1127 | * |
b39927cf SR |
1128 | * Unfortunately references to read only data that referenced .init |
1129 | * sections had to be excluded. Almost all of these are false | |
1130 | * positives, they are created by gcc. The downside of excluding rodata | |
1131 | * is that there really are some user references from rodata to | |
1132 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 1133 | * |
b39927cf SR |
1134 | * const struct consw vga_con = { |
1135 | * con_startup: vgacon_startup, | |
1136 | * | |
1137 | * where vgacon_startup is __init. If you want to wade through the false | |
1138 | * positives, take out the check for rodata. | |
1087247b | 1139 | */ |
b39927cf SR |
1140 | static int init_section_ref_ok(const char *name) |
1141 | { | |
1142 | const char **s; | |
1143 | /* Absolute section names */ | |
1144 | const char *namelist1[] = { | |
eec73e88 | 1145 | "__dbe_table", /* MIPS generate these */ |
21c4ff80 BH |
1146 | "__ftr_fixup", /* powerpc cpu feature fixup */ |
1147 | "__fw_ftr_fixup", /* powerpc firmware feature fixup */ | |
1087247b SR |
1148 | "__param", |
1149 | ".data.rel.ro", /* used by parisc64 */ | |
1150 | ".init", | |
1151 | ".text.lock", | |
b39927cf SR |
1152 | NULL |
1153 | }; | |
1154 | /* Start of section names */ | |
1155 | const char *namelist2[] = { | |
1156 | ".init.", | |
1087247b | 1157 | ".pci_fixup", |
742433b0 | 1158 | ".rodata", |
6e10133f SR |
1159 | NULL |
1160 | }; | |
1161 | ||
1087247b SR |
1162 | if (initexit_section_ref_ok(name)) |
1163 | return 1; | |
1164 | ||
b39927cf SR |
1165 | for (s = namelist1; *s; s++) |
1166 | if (strcmp(*s, name) == 0) | |
1167 | return 1; | |
62070fa4 | 1168 | for (s = namelist2; *s; s++) |
b39927cf SR |
1169 | if (strncmp(*s, name, strlen(*s)) == 0) |
1170 | return 1; | |
1087247b SR |
1171 | |
1172 | /* If section name ends with ".init" we allow references | |
1173 | * as is the case with .initcallN.init, .early_param.init, .taglist.init etc | |
1174 | */ | |
468d9494 AV |
1175 | if (strrcmp(name, ".init") == 0) |
1176 | return 1; | |
b39927cf SR |
1177 | return 0; |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Functions used only during module exit is marked __exit and is stored in | |
1182 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
1183 | * a .exit.data section. | |
1184 | * If this section is one of these sections return 1 | |
1185 | * See include/linux/init.h for the details | |
1186 | **/ | |
1187 | static int exit_section(const char *name) | |
1188 | { | |
1189 | if (strcmp(name, ".exit.text") == 0) | |
1190 | return 1; | |
1191 | if (strcmp(name, ".exit.data") == 0) | |
1192 | return 1; | |
1193 | return 0; | |
62070fa4 | 1194 | |
b39927cf SR |
1195 | } |
1196 | ||
1197 | /* | |
1198 | * Identify sections from which references to a .exit section is OK. | |
1087247b | 1199 | */ |
b39927cf SR |
1200 | static int exit_section_ref_ok(const char *name) |
1201 | { | |
1202 | const char **s; | |
1203 | /* Absolute section names */ | |
1204 | const char *namelist1[] = { | |
b39927cf | 1205 | ".exit.data", |
1087247b SR |
1206 | ".exit.text", |
1207 | ".exitcall.exit", | |
5ecdd0f6 | 1208 | ".rodata", |
6e10133f SR |
1209 | NULL |
1210 | }; | |
62070fa4 | 1211 | |
1087247b SR |
1212 | if (initexit_section_ref_ok(name)) |
1213 | return 1; | |
1214 | ||
b39927cf SR |
1215 | for (s = namelist1; *s; s++) |
1216 | if (strcmp(*s, name) == 0) | |
1217 | return 1; | |
b39927cf SR |
1218 | return 0; |
1219 | } | |
1220 | ||
5c3ead8c | 1221 | static void read_symbols(char *modname) |
1da177e4 LT |
1222 | { |
1223 | const char *symname; | |
1224 | char *version; | |
b817f6fe | 1225 | char *license; |
1da177e4 LT |
1226 | struct module *mod; |
1227 | struct elf_info info = { }; | |
1228 | Elf_Sym *sym; | |
1229 | ||
85bd2fdd SR |
1230 | if (!parse_elf(&info, modname)) |
1231 | return; | |
1da177e4 LT |
1232 | |
1233 | mod = new_module(modname); | |
1234 | ||
1235 | /* When there's no vmlinux, don't print warnings about | |
1236 | * unresolved symbols (since there'll be too many ;) */ | |
1237 | if (is_vmlinux(modname)) { | |
1da177e4 | 1238 | have_vmlinux = 1; |
1da177e4 LT |
1239 | mod->skip = 1; |
1240 | } | |
1241 | ||
b817f6fe SR |
1242 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1243 | while (license) { | |
1244 | if (license_is_gpl_compatible(license)) | |
1245 | mod->gpl_compatible = 1; | |
1246 | else { | |
1247 | mod->gpl_compatible = 0; | |
1248 | break; | |
1249 | } | |
1250 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1251 | "license", license); | |
1252 | } | |
1253 | ||
1da177e4 LT |
1254 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1255 | symname = info.strtab + sym->st_name; | |
1256 | ||
1257 | handle_modversions(mod, &info, sym, symname); | |
1258 | handle_moddevtable(mod, &info, sym, symname); | |
1259 | } | |
b39927cf SR |
1260 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
1261 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1da177e4 LT |
1262 | |
1263 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1264 | if (version) | |
1265 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1266 | version - (char *)info.hdr); | |
1267 | if (version || (all_versions && !is_vmlinux(modname))) | |
1268 | get_src_version(modname, mod->srcversion, | |
1269 | sizeof(mod->srcversion)-1); | |
1270 | ||
1271 | parse_elf_finish(&info); | |
1272 | ||
1273 | /* Our trick to get versioning for struct_module - it's | |
1274 | * never passed as an argument to an exported function, so | |
1275 | * the automatic versioning doesn't pick it up, but it's really | |
1276 | * important anyhow */ | |
1277 | if (modversions) | |
1278 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1279 | } | |
1280 | ||
1281 | #define SZ 500 | |
1282 | ||
1283 | /* We first write the generated file into memory using the | |
1284 | * following helper, then compare to the file on disk and | |
1285 | * only update the later if anything changed */ | |
1286 | ||
5c3ead8c SR |
1287 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1288 | const char *fmt, ...) | |
1da177e4 LT |
1289 | { |
1290 | char tmp[SZ]; | |
1291 | int len; | |
1292 | va_list ap; | |
62070fa4 | 1293 | |
1da177e4 LT |
1294 | va_start(ap, fmt); |
1295 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1296 | buf_write(buf, tmp, len); |
1da177e4 LT |
1297 | va_end(ap); |
1298 | } | |
1299 | ||
5c3ead8c | 1300 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1301 | { |
1302 | if (buf->size - buf->pos < len) { | |
7670f023 | 1303 | buf->size += len + SZ; |
1da177e4 LT |
1304 | buf->p = realloc(buf->p, buf->size); |
1305 | } | |
1306 | strncpy(buf->p + buf->pos, s, len); | |
1307 | buf->pos += len; | |
1308 | } | |
1309 | ||
c96fca21 SR |
1310 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1311 | { | |
1312 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1313 | ||
1314 | switch (exp) { | |
1315 | case export_gpl: | |
1316 | fatal("modpost: GPL-incompatible module %s%s " | |
1317 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1318 | break; | |
1319 | case export_unused_gpl: | |
1320 | fatal("modpost: GPL-incompatible module %s%s " | |
1321 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1322 | break; | |
1323 | case export_gpl_future: | |
1324 | warn("modpost: GPL-incompatible module %s%s " | |
1325 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1326 | break; | |
1327 | case export_plain: | |
1328 | case export_unused: | |
1329 | case export_unknown: | |
1330 | /* ignore */ | |
1331 | break; | |
1332 | } | |
1333 | } | |
1334 | ||
1335 | static void check_for_unused(enum export exp, const char* m, const char* s) | |
1336 | { | |
1337 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1338 | ||
1339 | switch (exp) { | |
1340 | case export_unused: | |
1341 | case export_unused_gpl: | |
1342 | warn("modpost: module %s%s " | |
1343 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1344 | break; | |
1345 | default: | |
1346 | /* ignore */ | |
1347 | break; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1352 | { |
1353 | struct symbol *s, *exp; | |
1354 | ||
1355 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1356 | const char *basename; |
b817f6fe SR |
1357 | exp = find_symbol(s->name); |
1358 | if (!exp || exp->module == mod) | |
1359 | continue; | |
6449bd62 | 1360 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1361 | if (basename) |
1362 | basename++; | |
c96fca21 SR |
1363 | else |
1364 | basename = mod->name; | |
1365 | if (!mod->gpl_compatible) | |
1366 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1367 | check_for_unused(exp->export, basename, exp->name); | |
b817f6fe SR |
1368 | } |
1369 | } | |
1370 | ||
5c3ead8c SR |
1371 | /** |
1372 | * Header for the generated file | |
1373 | **/ | |
1374 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1375 | { |
1376 | buf_printf(b, "#include <linux/module.h>\n"); | |
1377 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1378 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1379 | buf_printf(b, "\n"); | |
1380 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1381 | buf_printf(b, "\n"); | |
1da177e4 LT |
1382 | buf_printf(b, "struct module __this_module\n"); |
1383 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1384 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1385 | if (mod->has_init) |
1386 | buf_printf(b, " .init = init_module,\n"); | |
1387 | if (mod->has_cleanup) | |
1388 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1389 | " .exit = cleanup_module,\n" | |
1390 | "#endif\n"); | |
e61a1c1c | 1391 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1392 | buf_printf(b, "};\n"); |
1393 | } | |
1394 | ||
5c3ead8c SR |
1395 | /** |
1396 | * Record CRCs for unresolved symbols | |
1397 | **/ | |
c53ddacd | 1398 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1399 | { |
1400 | struct symbol *s, *exp; | |
c53ddacd | 1401 | int err = 0; |
1da177e4 LT |
1402 | |
1403 | for (s = mod->unres; s; s = s->next) { | |
1404 | exp = find_symbol(s->name); | |
1405 | if (!exp || exp->module == mod) { | |
c53ddacd | 1406 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1407 | if (warn_unresolved) { |
1408 | warn("\"%s\" [%s.ko] undefined!\n", | |
1409 | s->name, mod->name); | |
1410 | } else { | |
1411 | merror("\"%s\" [%s.ko] undefined!\n", | |
1412 | s->name, mod->name); | |
1413 | err = 1; | |
1414 | } | |
c53ddacd | 1415 | } |
1da177e4 LT |
1416 | continue; |
1417 | } | |
1418 | s->module = exp->module; | |
1419 | s->crc_valid = exp->crc_valid; | |
1420 | s->crc = exp->crc; | |
1421 | } | |
1422 | ||
1423 | if (!modversions) | |
c53ddacd | 1424 | return err; |
1da177e4 LT |
1425 | |
1426 | buf_printf(b, "\n"); | |
1427 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1428 | buf_printf(b, "__attribute_used__\n"); | |
1429 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1430 | ||
1431 | for (s = mod->unres; s; s = s->next) { | |
1432 | if (!s->module) { | |
1433 | continue; | |
1434 | } | |
1435 | if (!s->crc_valid) { | |
cb80514d | 1436 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1437 | s->name, mod->name); |
1438 | continue; | |
1439 | } | |
1440 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1441 | } | |
1442 | ||
1443 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1444 | |
1445 | return err; | |
1da177e4 LT |
1446 | } |
1447 | ||
5c3ead8c SR |
1448 | static void add_depends(struct buffer *b, struct module *mod, |
1449 | struct module *modules) | |
1da177e4 LT |
1450 | { |
1451 | struct symbol *s; | |
1452 | struct module *m; | |
1453 | int first = 1; | |
1454 | ||
1455 | for (m = modules; m; m = m->next) { | |
1456 | m->seen = is_vmlinux(m->name); | |
1457 | } | |
1458 | ||
1459 | buf_printf(b, "\n"); | |
1460 | buf_printf(b, "static const char __module_depends[]\n"); | |
1461 | buf_printf(b, "__attribute_used__\n"); | |
1462 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1463 | buf_printf(b, "\"depends="); | |
1464 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1465 | const char *p; |
1da177e4 LT |
1466 | if (!s->module) |
1467 | continue; | |
1468 | ||
1469 | if (s->module->seen) | |
1470 | continue; | |
1471 | ||
1472 | s->module->seen = 1; | |
a61b2dfd SR |
1473 | if ((p = strrchr(s->module->name, '/')) != NULL) |
1474 | p++; | |
1475 | else | |
1476 | p = s->module->name; | |
1477 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1478 | first = 0; |
1479 | } | |
1480 | buf_printf(b, "\";\n"); | |
1481 | } | |
1482 | ||
5c3ead8c | 1483 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1484 | { |
1485 | if (mod->srcversion[0]) { | |
1486 | buf_printf(b, "\n"); | |
1487 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1488 | mod->srcversion); | |
1489 | } | |
1490 | } | |
1491 | ||
5c3ead8c | 1492 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1493 | { |
1494 | char *tmp; | |
1495 | FILE *file; | |
1496 | struct stat st; | |
1497 | ||
1498 | file = fopen(fname, "r"); | |
1499 | if (!file) | |
1500 | goto write; | |
1501 | ||
1502 | if (fstat(fileno(file), &st) < 0) | |
1503 | goto close_write; | |
1504 | ||
1505 | if (st.st_size != b->pos) | |
1506 | goto close_write; | |
1507 | ||
1508 | tmp = NOFAIL(malloc(b->pos)); | |
1509 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1510 | goto free_write; | |
1511 | ||
1512 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1513 | goto free_write; | |
1514 | ||
1515 | free(tmp); | |
1516 | fclose(file); | |
1517 | return; | |
1518 | ||
1519 | free_write: | |
1520 | free(tmp); | |
1521 | close_write: | |
1522 | fclose(file); | |
1523 | write: | |
1524 | file = fopen(fname, "w"); | |
1525 | if (!file) { | |
1526 | perror(fname); | |
1527 | exit(1); | |
1528 | } | |
1529 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1530 | perror(fname); | |
1531 | exit(1); | |
1532 | } | |
1533 | fclose(file); | |
1534 | } | |
1535 | ||
bd5cbced | 1536 | /* parse Module.symvers file. line format: |
534b89a9 | 1537 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1538 | **/ |
040fcc81 | 1539 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1540 | { |
1541 | unsigned long size, pos = 0; | |
1542 | void *file = grab_file(fname, &size); | |
1543 | char *line; | |
1544 | ||
1545 | if (!file) | |
1546 | /* No symbol versions, silently ignore */ | |
1547 | return; | |
1548 | ||
1549 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1550 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1551 | unsigned int crc; |
1552 | struct module *mod; | |
040fcc81 | 1553 | struct symbol *s; |
1da177e4 LT |
1554 | |
1555 | if (!(symname = strchr(line, '\t'))) | |
1556 | goto fail; | |
1557 | *symname++ = '\0'; | |
1558 | if (!(modname = strchr(symname, '\t'))) | |
1559 | goto fail; | |
1560 | *modname++ = '\0'; | |
9ac545b0 | 1561 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1562 | *export++ = '\0'; |
534b89a9 SR |
1563 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1564 | *end = '\0'; | |
1da177e4 LT |
1565 | crc = strtoul(line, &d, 16); |
1566 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1567 | goto fail; | |
1568 | ||
1569 | if (!(mod = find_module(modname))) { | |
1570 | if (is_vmlinux(modname)) { | |
1571 | have_vmlinux = 1; | |
1572 | } | |
1573 | mod = new_module(NOFAIL(strdup(modname))); | |
1574 | mod->skip = 1; | |
1575 | } | |
bd5cbced | 1576 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1577 | s->kernel = kernel; |
1578 | s->preloaded = 1; | |
bd5cbced | 1579 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1580 | } |
1581 | return; | |
1582 | fail: | |
1583 | fatal("parse error in symbol dump file\n"); | |
1584 | } | |
1585 | ||
040fcc81 SR |
1586 | /* For normal builds always dump all symbols. |
1587 | * For external modules only dump symbols | |
1588 | * that are not read from kernel Module.symvers. | |
1589 | **/ | |
1590 | static int dump_sym(struct symbol *sym) | |
1591 | { | |
1592 | if (!external_module) | |
1593 | return 1; | |
1594 | if (sym->vmlinux || sym->kernel) | |
1595 | return 0; | |
1596 | return 1; | |
1597 | } | |
62070fa4 | 1598 | |
5c3ead8c | 1599 | static void write_dump(const char *fname) |
1da177e4 LT |
1600 | { |
1601 | struct buffer buf = { }; | |
1602 | struct symbol *symbol; | |
1603 | int n; | |
1604 | ||
1605 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1606 | symbol = symbolhash[n]; | |
1607 | while (symbol) { | |
040fcc81 | 1608 | if (dump_sym(symbol)) |
bd5cbced | 1609 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1610 | symbol->crc, symbol->name, |
bd5cbced RP |
1611 | symbol->module->name, |
1612 | export_str(symbol->export)); | |
1da177e4 LT |
1613 | symbol = symbol->next; |
1614 | } | |
1615 | } | |
1616 | write_if_changed(&buf, fname); | |
1617 | } | |
1618 | ||
5c3ead8c | 1619 | int main(int argc, char **argv) |
1da177e4 LT |
1620 | { |
1621 | struct module *mod; | |
1622 | struct buffer buf = { }; | |
1623 | char fname[SZ]; | |
040fcc81 SR |
1624 | char *kernel_read = NULL, *module_read = NULL; |
1625 | char *dump_write = NULL; | |
1da177e4 | 1626 | int opt; |
c53ddacd | 1627 | int err; |
1da177e4 | 1628 | |
c53ddacd | 1629 | while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) { |
1da177e4 LT |
1630 | switch(opt) { |
1631 | case 'i': | |
040fcc81 SR |
1632 | kernel_read = optarg; |
1633 | break; | |
1634 | case 'I': | |
1635 | module_read = optarg; | |
1636 | external_module = 1; | |
1da177e4 LT |
1637 | break; |
1638 | case 'm': | |
1639 | modversions = 1; | |
1640 | break; | |
1641 | case 'o': | |
1642 | dump_write = optarg; | |
1643 | break; | |
1644 | case 'a': | |
1645 | all_versions = 1; | |
1646 | break; | |
c53ddacd KK |
1647 | case 'w': |
1648 | warn_unresolved = 1; | |
1649 | break; | |
1da177e4 LT |
1650 | default: |
1651 | exit(1); | |
1652 | } | |
1653 | } | |
1654 | ||
040fcc81 SR |
1655 | if (kernel_read) |
1656 | read_dump(kernel_read, 1); | |
1657 | if (module_read) | |
1658 | read_dump(module_read, 0); | |
1da177e4 LT |
1659 | |
1660 | while (optind < argc) { | |
1661 | read_symbols(argv[optind++]); | |
1662 | } | |
1663 | ||
b817f6fe SR |
1664 | for (mod = modules; mod; mod = mod->next) { |
1665 | if (mod->skip) | |
1666 | continue; | |
c96fca21 | 1667 | check_exports(mod); |
b817f6fe SR |
1668 | } |
1669 | ||
c53ddacd KK |
1670 | err = 0; |
1671 | ||
1da177e4 LT |
1672 | for (mod = modules; mod; mod = mod->next) { |
1673 | if (mod->skip) | |
1674 | continue; | |
1675 | ||
1676 | buf.pos = 0; | |
1677 | ||
1678 | add_header(&buf, mod); | |
c53ddacd | 1679 | err |= add_versions(&buf, mod); |
1da177e4 LT |
1680 | add_depends(&buf, mod, modules); |
1681 | add_moddevtable(&buf, mod); | |
1682 | add_srcversion(&buf, mod); | |
1683 | ||
1684 | sprintf(fname, "%s.mod.c", mod->name); | |
1685 | write_if_changed(&buf, fname); | |
1686 | } | |
1687 | ||
1688 | if (dump_write) | |
1689 | write_dump(dump_write); | |
1690 | ||
c53ddacd | 1691 | return err; |
1da177e4 | 1692 | } |