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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 | |
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 |
4c8fbca5 | 612 | * fromsec = .data |
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 SR |
674 | f2 = 0; |
675 | if (strcmp(fromsec, ".data") != 0) | |
676 | f2 = 0; | |
677 | ||
678 | for (s = pat2sym; *s; s++) | |
679 | if (strrcmp(atsym, *s) == 0) | |
680 | f1 = 1; | |
9e157a5a MD |
681 | if (f1 && f2) |
682 | return 1; | |
4c8fbca5 | 683 | |
9bf8cb9b | 684 | /* Check for pattern 3 */ |
9bf8cb9b SR |
685 | if ((strcmp(fromsec, ".text.head") == 0) && |
686 | ((strcmp(tosec, ".init.data") == 0) || | |
687 | (strcmp(tosec, ".init.text") == 0))) | |
688 | return 1; | |
689 | ||
1d8af559 | 690 | /* Check for pattern 4 */ |
9bf8cb9b SR |
691 | for (s = pat3refsym; *s; s++) |
692 | if (strcmp(refsymname, *s) == 0) | |
693 | return 1; | |
694 | ||
93659af1 | 695 | return 0; |
4c8fbca5 SR |
696 | } |
697 | ||
93684d3b SR |
698 | /** |
699 | * Find symbol based on relocation record info. | |
700 | * In some cases the symbol supplied is a valid symbol so | |
701 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
702 | * In other cases the symbol needs to be looked up in the symbol table | |
703 | * based on section and address. | |
704 | * **/ | |
705 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
706 | Elf_Sym *relsym) | |
707 | { | |
708 | Elf_Sym *sym; | |
709 | ||
710 | if (relsym->st_name != 0) | |
711 | return relsym; | |
712 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
713 | if (sym->st_shndx != relsym->st_shndx) | |
714 | continue; | |
ae4ac123 AN |
715 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
716 | continue; | |
93684d3b SR |
717 | if (sym->st_value == addr) |
718 | return sym; | |
719 | } | |
720 | return NULL; | |
721 | } | |
722 | ||
da68d61f DB |
723 | static inline int is_arm_mapping_symbol(const char *str) |
724 | { | |
725 | return str[0] == '$' && strchr("atd", str[1]) | |
726 | && (str[2] == '\0' || str[2] == '.'); | |
727 | } | |
728 | ||
729 | /* | |
730 | * If there's no name there, ignore it; likewise, ignore it if it's | |
731 | * one of the magic symbols emitted used by current ARM tools. | |
732 | * | |
733 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
734 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
735 | * only by merging __exit and __init sections into __text, bloating | |
736 | * the kernel (which is especially evil on embedded platforms). | |
737 | */ | |
738 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
739 | { | |
740 | const char *name = elf->strtab + sym->st_name; | |
741 | ||
742 | if (!name || !strlen(name)) | |
743 | return 0; | |
744 | return !is_arm_mapping_symbol(name); | |
745 | } | |
746 | ||
b39927cf | 747 | /* |
43c74d17 SR |
748 | * Find symbols before or equal addr and after addr - in the section sec. |
749 | * If we find two symbols with equal offset prefer one with a valid name. | |
750 | * The ELF format may have a better way to detect what type of symbol | |
751 | * it is, but this works for now. | |
b39927cf SR |
752 | **/ |
753 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
754 | const char *sec, | |
755 | Elf_Sym **before, Elf_Sym **after) | |
756 | { | |
757 | Elf_Sym *sym; | |
758 | Elf_Ehdr *hdr = elf->hdr; | |
759 | Elf_Addr beforediff = ~0; | |
760 | Elf_Addr afterdiff = ~0; | |
761 | const char *secstrings = (void *)hdr + | |
762 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 763 | |
b39927cf SR |
764 | *before = NULL; |
765 | *after = NULL; | |
766 | ||
767 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
768 | const char *symsec; | |
769 | ||
770 | if (sym->st_shndx >= SHN_LORESERVE) | |
771 | continue; | |
772 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
773 | if (strcmp(symsec, sec) != 0) | |
774 | continue; | |
da68d61f DB |
775 | if (!is_valid_name(elf, sym)) |
776 | continue; | |
b39927cf SR |
777 | if (sym->st_value <= addr) { |
778 | if ((addr - sym->st_value) < beforediff) { | |
779 | beforediff = addr - sym->st_value; | |
780 | *before = sym; | |
781 | } | |
43c74d17 | 782 | else if ((addr - sym->st_value) == beforediff) { |
da68d61f | 783 | *before = sym; |
43c74d17 | 784 | } |
b39927cf SR |
785 | } |
786 | else | |
787 | { | |
788 | if ((sym->st_value - addr) < afterdiff) { | |
789 | afterdiff = sym->st_value - addr; | |
790 | *after = sym; | |
791 | } | |
43c74d17 | 792 | else if ((sym->st_value - addr) == afterdiff) { |
da68d61f | 793 | *after = sym; |
43c74d17 | 794 | } |
b39927cf SR |
795 | } |
796 | } | |
797 | } | |
798 | ||
799 | /** | |
800 | * Print a warning about a section mismatch. | |
801 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 802 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
803 | **/ |
804 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
805 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
806 | { | |
93684d3b SR |
807 | const char *refsymname = ""; |
808 | Elf_Sym *before, *after; | |
809 | Elf_Sym *refsym; | |
b39927cf SR |
810 | Elf_Ehdr *hdr = elf->hdr; |
811 | Elf_Shdr *sechdrs = elf->sechdrs; | |
812 | const char *secstrings = (void *)hdr + | |
813 | sechdrs[hdr->e_shstrndx].sh_offset; | |
814 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 815 | |
b39927cf SR |
816 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
817 | ||
93684d3b SR |
818 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
819 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
820 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
821 | |
822 | /* check whitelist - we may ignore it */ | |
62070fa4 | 823 | if (before && |
9e157a5a | 824 | secref_whitelist(modname, secname, fromsec, |
ee6a8545 | 825 | elf->strtab + before->st_name, refsymname)) |
4c8fbca5 | 826 | return; |
62070fa4 | 827 | |
b39927cf | 828 | if (before && after) { |
25601209 RK |
829 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
830 | "(between '%s' and '%s')\n", | |
831 | modname, fromsec, (unsigned long long)r.r_offset, | |
832 | secname, refsymname, | |
b39927cf | 833 | elf->strtab + before->st_name, |
b39927cf SR |
834 | elf->strtab + after->st_name); |
835 | } else if (before) { | |
25601209 RK |
836 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
837 | "(after '%s')\n", | |
838 | modname, fromsec, (unsigned long long)r.r_offset, | |
839 | secname, refsymname, | |
840 | elf->strtab + before->st_name); | |
b39927cf | 841 | } else if (after) { |
25601209 | 842 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
93684d3b | 843 | "before '%s' (at offset -0x%llx)\n", |
25601209 RK |
844 | modname, fromsec, (unsigned long long)r.r_offset, |
845 | secname, refsymname, | |
846 | elf->strtab + after->st_name); | |
b39927cf | 847 | } else { |
25601209 RK |
848 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n", |
849 | modname, fromsec, (unsigned long long)r.r_offset, | |
850 | secname, refsymname); | |
b39927cf SR |
851 | } |
852 | } | |
853 | ||
ae4ac123 AN |
854 | static unsigned int *reloc_location(struct elf_info *elf, |
855 | int rsection, Elf_Rela *r) | |
856 | { | |
857 | Elf_Shdr *sechdrs = elf->sechdrs; | |
858 | int section = sechdrs[rsection].sh_info; | |
859 | ||
860 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
861 | (r->r_offset - sechdrs[section].sh_addr); | |
862 | } | |
863 | ||
864 | static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r) | |
865 | { | |
866 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
867 | unsigned int *location = reloc_location(elf, rsection, r); | |
868 | ||
869 | switch (r_typ) { | |
870 | case R_386_32: | |
871 | r->r_addend = TO_NATIVE(*location); | |
872 | break; | |
873 | case R_386_PC32: | |
874 | r->r_addend = TO_NATIVE(*location) + 4; | |
875 | /* For CONFIG_RELOCATABLE=y */ | |
876 | if (elf->hdr->e_type == ET_EXEC) | |
877 | r->r_addend += r->r_offset; | |
878 | break; | |
879 | } | |
880 | return 0; | |
881 | } | |
882 | ||
56a974fa SR |
883 | static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
884 | { | |
885 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
886 | ||
887 | switch (r_typ) { | |
888 | case R_ARM_ABS32: | |
889 | /* From ARM ABI: (S + A) | T */ | |
890 | r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info)); | |
891 | break; | |
892 | case R_ARM_PC24: | |
893 | /* From ARM ABI: ((S + A) | T) - P */ | |
894 | r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset + | |
895 | (r->r_offset - elf->sechdrs[rsection].sh_addr)); | |
896 | break; | |
897 | default: | |
898 | return 1; | |
899 | } | |
900 | return 0; | |
901 | } | |
902 | ||
ae4ac123 AN |
903 | static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
904 | { | |
905 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
906 | unsigned int *location = reloc_location(elf, rsection, r); | |
907 | unsigned int inst; | |
908 | ||
909 | if (r_typ == R_MIPS_HI16) | |
910 | return 1; /* skip this */ | |
911 | inst = TO_NATIVE(*location); | |
912 | switch (r_typ) { | |
913 | case R_MIPS_LO16: | |
914 | r->r_addend = inst & 0xffff; | |
915 | break; | |
916 | case R_MIPS_26: | |
917 | r->r_addend = (inst & 0x03ffffff) << 2; | |
918 | break; | |
919 | case R_MIPS_32: | |
920 | r->r_addend = inst; | |
921 | break; | |
922 | } | |
923 | return 0; | |
924 | } | |
925 | ||
b39927cf SR |
926 | /** |
927 | * A module includes a number of sections that are discarded | |
928 | * either when loaded or when used as built-in. | |
929 | * For loaded modules all functions marked __init and all data | |
930 | * marked __initdata will be discarded when the module has been intialized. | |
931 | * Likewise for modules used built-in the sections marked __exit | |
932 | * are discarded because __exit marked function are supposed to be called | |
933 | * only when a moduel is unloaded which never happes for built-in modules. | |
934 | * The check_sec_ref() function traverses all relocation records | |
935 | * to find all references to a section that reference a section that will | |
936 | * be discarded and warns about it. | |
937 | **/ | |
938 | static void check_sec_ref(struct module *mod, const char *modname, | |
939 | struct elf_info *elf, | |
940 | int section(const char*), | |
941 | int section_ref_ok(const char *)) | |
942 | { | |
943 | int i; | |
944 | Elf_Sym *sym; | |
945 | Elf_Ehdr *hdr = elf->hdr; | |
946 | Elf_Shdr *sechdrs = elf->sechdrs; | |
947 | const char *secstrings = (void *)hdr + | |
948 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 949 | |
b39927cf SR |
950 | /* Walk through all sections */ |
951 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
952 | const char *name = secstrings + sechdrs[i].sh_name; |
953 | const char *secname; | |
954 | Elf_Rela r; | |
eae07ac6 | 955 | unsigned int r_sym; |
b39927cf | 956 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
957 | if (sechdrs[i].sh_type == SHT_RELA) { |
958 | Elf_Rela *rela; | |
959 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
960 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
961 | name += strlen(".rela"); | |
962 | if (section_ref_ok(name)) | |
963 | continue; | |
b39927cf | 964 | |
2c1a51f3 AN |
965 | for (rela = start; rela < stop; rela++) { |
966 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
967 | #if KERNEL_ELFCLASS == ELFCLASS64 |
968 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 969 | unsigned int r_typ; |
eae07ac6 AN |
970 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
971 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
972 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); |
973 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
974 | } else { |
975 | r.r_info = TO_NATIVE(rela->r_info); | |
976 | r_sym = ELF_R_SYM(r.r_info); | |
977 | } | |
978 | #else | |
979 | r.r_info = TO_NATIVE(rela->r_info); | |
980 | r_sym = ELF_R_SYM(r.r_info); | |
981 | #endif | |
2c1a51f3 | 982 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 983 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
984 | /* Skip special sections */ |
985 | if (sym->st_shndx >= SHN_LORESERVE) | |
986 | continue; | |
987 | ||
988 | secname = secstrings + | |
989 | sechdrs[sym->st_shndx].sh_name; | |
990 | if (section(secname)) | |
991 | warn_sec_mismatch(modname, name, | |
992 | elf, sym, r); | |
993 | } | |
994 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
995 | Elf_Rel *rel; | |
996 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
997 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
998 | name += strlen(".rel"); | |
999 | if (section_ref_ok(name)) | |
b39927cf SR |
1000 | continue; |
1001 | ||
2c1a51f3 AN |
1002 | for (rel = start; rel < stop; rel++) { |
1003 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
1004 | #if KERNEL_ELFCLASS == ELFCLASS64 |
1005 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 1006 | unsigned int r_typ; |
eae07ac6 AN |
1007 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
1008 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
1009 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); |
1010 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
1011 | } else { |
1012 | r.r_info = TO_NATIVE(rel->r_info); | |
1013 | r_sym = ELF_R_SYM(r.r_info); | |
1014 | } | |
1015 | #else | |
1016 | r.r_info = TO_NATIVE(rel->r_info); | |
1017 | r_sym = ELF_R_SYM(r.r_info); | |
1018 | #endif | |
2c1a51f3 | 1019 | r.r_addend = 0; |
ae4ac123 AN |
1020 | switch (hdr->e_machine) { |
1021 | case EM_386: | |
1022 | if (addend_386_rel(elf, i, &r)) | |
1023 | continue; | |
1024 | break; | |
56a974fa SR |
1025 | case EM_ARM: |
1026 | if(addend_arm_rel(elf, i, &r)) | |
1027 | continue; | |
1028 | break; | |
ae4ac123 AN |
1029 | case EM_MIPS: |
1030 | if (addend_mips_rel(elf, i, &r)) | |
1031 | continue; | |
1032 | break; | |
1033 | } | |
eae07ac6 | 1034 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
1035 | /* Skip special sections */ |
1036 | if (sym->st_shndx >= SHN_LORESERVE) | |
1037 | continue; | |
1038 | ||
1039 | secname = secstrings + | |
1040 | sechdrs[sym->st_shndx].sh_name; | |
1041 | if (section(secname)) | |
1042 | warn_sec_mismatch(modname, name, | |
1043 | elf, sym, r); | |
1044 | } | |
b39927cf SR |
1045 | } |
1046 | } | |
1047 | } | |
1048 | ||
1087247b SR |
1049 | /* |
1050 | * Identify sections from which references to either a | |
1051 | * .init or a .exit section is OK. | |
1052 | * | |
1053 | * [OPD] Keith Ownes <kaos@sgi.com> commented: | |
1054 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
1055 | * section, not the ia64 .opd section. | |
1056 | * ia64 .opd should not point to discarded sections. | |
1057 | * [.rodata] like for .init.text we ignore .rodata references -same reason | |
1d8af559 | 1058 | */ |
1087247b SR |
1059 | static int initexit_section_ref_ok(const char *name) |
1060 | { | |
1061 | const char **s; | |
1062 | /* Absolute section names */ | |
1063 | const char *namelist1[] = { | |
1064 | "__bug_table", /* used by powerpc for BUG() */ | |
1065 | "__ex_table", | |
1066 | ".altinstructions", | |
1067 | ".cranges", /* used by sh64 */ | |
1068 | ".fixup", | |
1d8af559 SR |
1069 | ".machvec", /* ia64 + powerpc uses these */ |
1070 | ".machine.desc", | |
1087247b SR |
1071 | ".opd", /* See comment [OPD] */ |
1072 | ".parainstructions", | |
1073 | ".pdr", | |
1074 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ | |
1075 | ".smp_locks", | |
1076 | ".stab", | |
1077 | NULL | |
1078 | }; | |
1079 | /* Start of section names */ | |
1080 | const char *namelist2[] = { | |
1081 | ".debug", | |
1082 | ".eh_frame", | |
1083 | ".note", /* ignore ELF notes - may contain anything */ | |
1084 | ".got", /* powerpc - global offset table */ | |
1085 | ".toc", /* powerpc - table of contents */ | |
1086 | NULL | |
1087 | }; | |
1088 | /* part of section name */ | |
1089 | const char *namelist3 [] = { | |
1090 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
1091 | NULL | |
1092 | }; | |
1093 | ||
1094 | for (s = namelist1; *s; s++) | |
1095 | if (strcmp(*s, name) == 0) | |
1096 | return 1; | |
1097 | for (s = namelist2; *s; s++) | |
1098 | if (strncmp(*s, name, strlen(*s)) == 0) | |
1099 | return 1; | |
1100 | for (s = namelist3; *s; s++) | |
1101 | if (strstr(name, *s) != NULL) | |
1102 | return 1; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
b39927cf SR |
1106 | /** |
1107 | * Functions used only during module init is marked __init and is stored in | |
1108 | * a .init.text section. Likewise data is marked __initdata and stored in | |
1109 | * a .init.data section. | |
1110 | * If this section is one of these sections return 1 | |
1111 | * See include/linux/init.h for the details | |
1112 | **/ | |
1113 | static int init_section(const char *name) | |
1114 | { | |
1115 | if (strcmp(name, ".init") == 0) | |
1116 | return 1; | |
1117 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
1118 | return 1; | |
1119 | return 0; | |
1120 | } | |
1121 | ||
1087247b | 1122 | /* |
b39927cf | 1123 | * Identify sections from which references to a .init section is OK. |
62070fa4 | 1124 | * |
b39927cf SR |
1125 | * Unfortunately references to read only data that referenced .init |
1126 | * sections had to be excluded. Almost all of these are false | |
1127 | * positives, they are created by gcc. The downside of excluding rodata | |
1128 | * is that there really are some user references from rodata to | |
1129 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 1130 | * |
b39927cf SR |
1131 | * const struct consw vga_con = { |
1132 | * con_startup: vgacon_startup, | |
1133 | * | |
1134 | * where vgacon_startup is __init. If you want to wade through the false | |
1135 | * positives, take out the check for rodata. | |
1087247b | 1136 | */ |
b39927cf SR |
1137 | static int init_section_ref_ok(const char *name) |
1138 | { | |
1139 | const char **s; | |
1140 | /* Absolute section names */ | |
1141 | const char *namelist1[] = { | |
21c4ff80 BH |
1142 | "__ftr_fixup", /* powerpc cpu feature fixup */ |
1143 | "__fw_ftr_fixup", /* powerpc firmware feature fixup */ | |
1087247b SR |
1144 | "__param", |
1145 | ".data.rel.ro", /* used by parisc64 */ | |
1146 | ".init", | |
1147 | ".text.lock", | |
b39927cf SR |
1148 | NULL |
1149 | }; | |
1150 | /* Start of section names */ | |
1151 | const char *namelist2[] = { | |
1152 | ".init.", | |
1087247b | 1153 | ".pci_fixup", |
742433b0 | 1154 | ".rodata", |
6e10133f SR |
1155 | NULL |
1156 | }; | |
1157 | ||
1087247b SR |
1158 | if (initexit_section_ref_ok(name)) |
1159 | return 1; | |
1160 | ||
b39927cf SR |
1161 | for (s = namelist1; *s; s++) |
1162 | if (strcmp(*s, name) == 0) | |
1163 | return 1; | |
62070fa4 | 1164 | for (s = namelist2; *s; s++) |
b39927cf SR |
1165 | if (strncmp(*s, name, strlen(*s)) == 0) |
1166 | return 1; | |
1087247b SR |
1167 | |
1168 | /* If section name ends with ".init" we allow references | |
1169 | * as is the case with .initcallN.init, .early_param.init, .taglist.init etc | |
1170 | */ | |
468d9494 AV |
1171 | if (strrcmp(name, ".init") == 0) |
1172 | return 1; | |
b39927cf SR |
1173 | return 0; |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Functions used only during module exit is marked __exit and is stored in | |
1178 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
1179 | * a .exit.data section. | |
1180 | * If this section is one of these sections return 1 | |
1181 | * See include/linux/init.h for the details | |
1182 | **/ | |
1183 | static int exit_section(const char *name) | |
1184 | { | |
1185 | if (strcmp(name, ".exit.text") == 0) | |
1186 | return 1; | |
1187 | if (strcmp(name, ".exit.data") == 0) | |
1188 | return 1; | |
1189 | return 0; | |
62070fa4 | 1190 | |
b39927cf SR |
1191 | } |
1192 | ||
1193 | /* | |
1194 | * Identify sections from which references to a .exit section is OK. | |
1087247b | 1195 | */ |
b39927cf SR |
1196 | static int exit_section_ref_ok(const char *name) |
1197 | { | |
1198 | const char **s; | |
1199 | /* Absolute section names */ | |
1200 | const char *namelist1[] = { | |
b39927cf | 1201 | ".exit.data", |
1087247b SR |
1202 | ".exit.text", |
1203 | ".exitcall.exit", | |
5ecdd0f6 | 1204 | ".rodata", |
6e10133f SR |
1205 | NULL |
1206 | }; | |
62070fa4 | 1207 | |
1087247b SR |
1208 | if (initexit_section_ref_ok(name)) |
1209 | return 1; | |
1210 | ||
b39927cf SR |
1211 | for (s = namelist1; *s; s++) |
1212 | if (strcmp(*s, name) == 0) | |
1213 | return 1; | |
b39927cf SR |
1214 | return 0; |
1215 | } | |
1216 | ||
5c3ead8c | 1217 | static void read_symbols(char *modname) |
1da177e4 LT |
1218 | { |
1219 | const char *symname; | |
1220 | char *version; | |
b817f6fe | 1221 | char *license; |
1da177e4 LT |
1222 | struct module *mod; |
1223 | struct elf_info info = { }; | |
1224 | Elf_Sym *sym; | |
1225 | ||
85bd2fdd SR |
1226 | if (!parse_elf(&info, modname)) |
1227 | return; | |
1da177e4 LT |
1228 | |
1229 | mod = new_module(modname); | |
1230 | ||
1231 | /* When there's no vmlinux, don't print warnings about | |
1232 | * unresolved symbols (since there'll be too many ;) */ | |
1233 | if (is_vmlinux(modname)) { | |
1da177e4 | 1234 | have_vmlinux = 1; |
1da177e4 LT |
1235 | mod->skip = 1; |
1236 | } | |
1237 | ||
b817f6fe SR |
1238 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1239 | while (license) { | |
1240 | if (license_is_gpl_compatible(license)) | |
1241 | mod->gpl_compatible = 1; | |
1242 | else { | |
1243 | mod->gpl_compatible = 0; | |
1244 | break; | |
1245 | } | |
1246 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1247 | "license", license); | |
1248 | } | |
1249 | ||
1da177e4 LT |
1250 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1251 | symname = info.strtab + sym->st_name; | |
1252 | ||
1253 | handle_modversions(mod, &info, sym, symname); | |
1254 | handle_moddevtable(mod, &info, sym, symname); | |
1255 | } | |
b39927cf SR |
1256 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); |
1257 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1da177e4 LT |
1258 | |
1259 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1260 | if (version) | |
1261 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1262 | version - (char *)info.hdr); | |
1263 | if (version || (all_versions && !is_vmlinux(modname))) | |
1264 | get_src_version(modname, mod->srcversion, | |
1265 | sizeof(mod->srcversion)-1); | |
1266 | ||
1267 | parse_elf_finish(&info); | |
1268 | ||
1269 | /* Our trick to get versioning for struct_module - it's | |
1270 | * never passed as an argument to an exported function, so | |
1271 | * the automatic versioning doesn't pick it up, but it's really | |
1272 | * important anyhow */ | |
1273 | if (modversions) | |
1274 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1275 | } | |
1276 | ||
1277 | #define SZ 500 | |
1278 | ||
1279 | /* We first write the generated file into memory using the | |
1280 | * following helper, then compare to the file on disk and | |
1281 | * only update the later if anything changed */ | |
1282 | ||
5c3ead8c SR |
1283 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1284 | const char *fmt, ...) | |
1da177e4 LT |
1285 | { |
1286 | char tmp[SZ]; | |
1287 | int len; | |
1288 | va_list ap; | |
62070fa4 | 1289 | |
1da177e4 LT |
1290 | va_start(ap, fmt); |
1291 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1292 | buf_write(buf, tmp, len); |
1da177e4 LT |
1293 | va_end(ap); |
1294 | } | |
1295 | ||
5c3ead8c | 1296 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1297 | { |
1298 | if (buf->size - buf->pos < len) { | |
7670f023 | 1299 | buf->size += len + SZ; |
1da177e4 LT |
1300 | buf->p = realloc(buf->p, buf->size); |
1301 | } | |
1302 | strncpy(buf->p + buf->pos, s, len); | |
1303 | buf->pos += len; | |
1304 | } | |
1305 | ||
c96fca21 SR |
1306 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1307 | { | |
1308 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1309 | ||
1310 | switch (exp) { | |
1311 | case export_gpl: | |
1312 | fatal("modpost: GPL-incompatible module %s%s " | |
1313 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1314 | break; | |
1315 | case export_unused_gpl: | |
1316 | fatal("modpost: GPL-incompatible module %s%s " | |
1317 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1318 | break; | |
1319 | case export_gpl_future: | |
1320 | warn("modpost: GPL-incompatible module %s%s " | |
1321 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1322 | break; | |
1323 | case export_plain: | |
1324 | case export_unused: | |
1325 | case export_unknown: | |
1326 | /* ignore */ | |
1327 | break; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | static void check_for_unused(enum export exp, const char* m, const char* s) | |
1332 | { | |
1333 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1334 | ||
1335 | switch (exp) { | |
1336 | case export_unused: | |
1337 | case export_unused_gpl: | |
1338 | warn("modpost: module %s%s " | |
1339 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1340 | break; | |
1341 | default: | |
1342 | /* ignore */ | |
1343 | break; | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1348 | { |
1349 | struct symbol *s, *exp; | |
1350 | ||
1351 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1352 | const char *basename; |
b817f6fe SR |
1353 | exp = find_symbol(s->name); |
1354 | if (!exp || exp->module == mod) | |
1355 | continue; | |
6449bd62 | 1356 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1357 | if (basename) |
1358 | basename++; | |
c96fca21 SR |
1359 | else |
1360 | basename = mod->name; | |
1361 | if (!mod->gpl_compatible) | |
1362 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1363 | check_for_unused(exp->export, basename, exp->name); | |
b817f6fe SR |
1364 | } |
1365 | } | |
1366 | ||
5c3ead8c SR |
1367 | /** |
1368 | * Header for the generated file | |
1369 | **/ | |
1370 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1371 | { |
1372 | buf_printf(b, "#include <linux/module.h>\n"); | |
1373 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1374 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1375 | buf_printf(b, "\n"); | |
1376 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1377 | buf_printf(b, "\n"); | |
1da177e4 LT |
1378 | buf_printf(b, "struct module __this_module\n"); |
1379 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1380 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1381 | if (mod->has_init) |
1382 | buf_printf(b, " .init = init_module,\n"); | |
1383 | if (mod->has_cleanup) | |
1384 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1385 | " .exit = cleanup_module,\n" | |
1386 | "#endif\n"); | |
e61a1c1c | 1387 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1388 | buf_printf(b, "};\n"); |
1389 | } | |
1390 | ||
5c3ead8c SR |
1391 | /** |
1392 | * Record CRCs for unresolved symbols | |
1393 | **/ | |
c53ddacd | 1394 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1395 | { |
1396 | struct symbol *s, *exp; | |
c53ddacd | 1397 | int err = 0; |
1da177e4 LT |
1398 | |
1399 | for (s = mod->unres; s; s = s->next) { | |
1400 | exp = find_symbol(s->name); | |
1401 | if (!exp || exp->module == mod) { | |
c53ddacd | 1402 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1403 | if (warn_unresolved) { |
1404 | warn("\"%s\" [%s.ko] undefined!\n", | |
1405 | s->name, mod->name); | |
1406 | } else { | |
1407 | merror("\"%s\" [%s.ko] undefined!\n", | |
1408 | s->name, mod->name); | |
1409 | err = 1; | |
1410 | } | |
c53ddacd | 1411 | } |
1da177e4 LT |
1412 | continue; |
1413 | } | |
1414 | s->module = exp->module; | |
1415 | s->crc_valid = exp->crc_valid; | |
1416 | s->crc = exp->crc; | |
1417 | } | |
1418 | ||
1419 | if (!modversions) | |
c53ddacd | 1420 | return err; |
1da177e4 LT |
1421 | |
1422 | buf_printf(b, "\n"); | |
1423 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1424 | buf_printf(b, "__attribute_used__\n"); | |
1425 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1426 | ||
1427 | for (s = mod->unres; s; s = s->next) { | |
1428 | if (!s->module) { | |
1429 | continue; | |
1430 | } | |
1431 | if (!s->crc_valid) { | |
cb80514d | 1432 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1433 | s->name, mod->name); |
1434 | continue; | |
1435 | } | |
1436 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1437 | } | |
1438 | ||
1439 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1440 | |
1441 | return err; | |
1da177e4 LT |
1442 | } |
1443 | ||
5c3ead8c SR |
1444 | static void add_depends(struct buffer *b, struct module *mod, |
1445 | struct module *modules) | |
1da177e4 LT |
1446 | { |
1447 | struct symbol *s; | |
1448 | struct module *m; | |
1449 | int first = 1; | |
1450 | ||
1451 | for (m = modules; m; m = m->next) { | |
1452 | m->seen = is_vmlinux(m->name); | |
1453 | } | |
1454 | ||
1455 | buf_printf(b, "\n"); | |
1456 | buf_printf(b, "static const char __module_depends[]\n"); | |
1457 | buf_printf(b, "__attribute_used__\n"); | |
1458 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1459 | buf_printf(b, "\"depends="); | |
1460 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1461 | const char *p; |
1da177e4 LT |
1462 | if (!s->module) |
1463 | continue; | |
1464 | ||
1465 | if (s->module->seen) | |
1466 | continue; | |
1467 | ||
1468 | s->module->seen = 1; | |
a61b2dfd SR |
1469 | if ((p = strrchr(s->module->name, '/')) != NULL) |
1470 | p++; | |
1471 | else | |
1472 | p = s->module->name; | |
1473 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1474 | first = 0; |
1475 | } | |
1476 | buf_printf(b, "\";\n"); | |
1477 | } | |
1478 | ||
5c3ead8c | 1479 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1480 | { |
1481 | if (mod->srcversion[0]) { | |
1482 | buf_printf(b, "\n"); | |
1483 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1484 | mod->srcversion); | |
1485 | } | |
1486 | } | |
1487 | ||
5c3ead8c | 1488 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1489 | { |
1490 | char *tmp; | |
1491 | FILE *file; | |
1492 | struct stat st; | |
1493 | ||
1494 | file = fopen(fname, "r"); | |
1495 | if (!file) | |
1496 | goto write; | |
1497 | ||
1498 | if (fstat(fileno(file), &st) < 0) | |
1499 | goto close_write; | |
1500 | ||
1501 | if (st.st_size != b->pos) | |
1502 | goto close_write; | |
1503 | ||
1504 | tmp = NOFAIL(malloc(b->pos)); | |
1505 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1506 | goto free_write; | |
1507 | ||
1508 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1509 | goto free_write; | |
1510 | ||
1511 | free(tmp); | |
1512 | fclose(file); | |
1513 | return; | |
1514 | ||
1515 | free_write: | |
1516 | free(tmp); | |
1517 | close_write: | |
1518 | fclose(file); | |
1519 | write: | |
1520 | file = fopen(fname, "w"); | |
1521 | if (!file) { | |
1522 | perror(fname); | |
1523 | exit(1); | |
1524 | } | |
1525 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1526 | perror(fname); | |
1527 | exit(1); | |
1528 | } | |
1529 | fclose(file); | |
1530 | } | |
1531 | ||
bd5cbced | 1532 | /* parse Module.symvers file. line format: |
534b89a9 | 1533 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1534 | **/ |
040fcc81 | 1535 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1536 | { |
1537 | unsigned long size, pos = 0; | |
1538 | void *file = grab_file(fname, &size); | |
1539 | char *line; | |
1540 | ||
1541 | if (!file) | |
1542 | /* No symbol versions, silently ignore */ | |
1543 | return; | |
1544 | ||
1545 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1546 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1547 | unsigned int crc; |
1548 | struct module *mod; | |
040fcc81 | 1549 | struct symbol *s; |
1da177e4 LT |
1550 | |
1551 | if (!(symname = strchr(line, '\t'))) | |
1552 | goto fail; | |
1553 | *symname++ = '\0'; | |
1554 | if (!(modname = strchr(symname, '\t'))) | |
1555 | goto fail; | |
1556 | *modname++ = '\0'; | |
9ac545b0 | 1557 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1558 | *export++ = '\0'; |
534b89a9 SR |
1559 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1560 | *end = '\0'; | |
1da177e4 LT |
1561 | crc = strtoul(line, &d, 16); |
1562 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1563 | goto fail; | |
1564 | ||
1565 | if (!(mod = find_module(modname))) { | |
1566 | if (is_vmlinux(modname)) { | |
1567 | have_vmlinux = 1; | |
1568 | } | |
1569 | mod = new_module(NOFAIL(strdup(modname))); | |
1570 | mod->skip = 1; | |
1571 | } | |
bd5cbced | 1572 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1573 | s->kernel = kernel; |
1574 | s->preloaded = 1; | |
bd5cbced | 1575 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1576 | } |
1577 | return; | |
1578 | fail: | |
1579 | fatal("parse error in symbol dump file\n"); | |
1580 | } | |
1581 | ||
040fcc81 SR |
1582 | /* For normal builds always dump all symbols. |
1583 | * For external modules only dump symbols | |
1584 | * that are not read from kernel Module.symvers. | |
1585 | **/ | |
1586 | static int dump_sym(struct symbol *sym) | |
1587 | { | |
1588 | if (!external_module) | |
1589 | return 1; | |
1590 | if (sym->vmlinux || sym->kernel) | |
1591 | return 0; | |
1592 | return 1; | |
1593 | } | |
62070fa4 | 1594 | |
5c3ead8c | 1595 | static void write_dump(const char *fname) |
1da177e4 LT |
1596 | { |
1597 | struct buffer buf = { }; | |
1598 | struct symbol *symbol; | |
1599 | int n; | |
1600 | ||
1601 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1602 | symbol = symbolhash[n]; | |
1603 | while (symbol) { | |
040fcc81 | 1604 | if (dump_sym(symbol)) |
bd5cbced | 1605 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1606 | symbol->crc, symbol->name, |
bd5cbced RP |
1607 | symbol->module->name, |
1608 | export_str(symbol->export)); | |
1da177e4 LT |
1609 | symbol = symbol->next; |
1610 | } | |
1611 | } | |
1612 | write_if_changed(&buf, fname); | |
1613 | } | |
1614 | ||
5c3ead8c | 1615 | int main(int argc, char **argv) |
1da177e4 LT |
1616 | { |
1617 | struct module *mod; | |
1618 | struct buffer buf = { }; | |
1619 | char fname[SZ]; | |
040fcc81 SR |
1620 | char *kernel_read = NULL, *module_read = NULL; |
1621 | char *dump_write = NULL; | |
1da177e4 | 1622 | int opt; |
c53ddacd | 1623 | int err; |
1da177e4 | 1624 | |
c53ddacd | 1625 | while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) { |
1da177e4 LT |
1626 | switch(opt) { |
1627 | case 'i': | |
040fcc81 SR |
1628 | kernel_read = optarg; |
1629 | break; | |
1630 | case 'I': | |
1631 | module_read = optarg; | |
1632 | external_module = 1; | |
1da177e4 LT |
1633 | break; |
1634 | case 'm': | |
1635 | modversions = 1; | |
1636 | break; | |
1637 | case 'o': | |
1638 | dump_write = optarg; | |
1639 | break; | |
1640 | case 'a': | |
1641 | all_versions = 1; | |
1642 | break; | |
c53ddacd KK |
1643 | case 'w': |
1644 | warn_unresolved = 1; | |
1645 | break; | |
1da177e4 LT |
1646 | default: |
1647 | exit(1); | |
1648 | } | |
1649 | } | |
1650 | ||
040fcc81 SR |
1651 | if (kernel_read) |
1652 | read_dump(kernel_read, 1); | |
1653 | if (module_read) | |
1654 | read_dump(module_read, 0); | |
1da177e4 LT |
1655 | |
1656 | while (optind < argc) { | |
1657 | read_symbols(argv[optind++]); | |
1658 | } | |
1659 | ||
b817f6fe SR |
1660 | for (mod = modules; mod; mod = mod->next) { |
1661 | if (mod->skip) | |
1662 | continue; | |
c96fca21 | 1663 | check_exports(mod); |
b817f6fe SR |
1664 | } |
1665 | ||
c53ddacd KK |
1666 | err = 0; |
1667 | ||
1da177e4 LT |
1668 | for (mod = modules; mod; mod = mod->next) { |
1669 | if (mod->skip) | |
1670 | continue; | |
1671 | ||
1672 | buf.pos = 0; | |
1673 | ||
1674 | add_header(&buf, mod); | |
c53ddacd | 1675 | err |= add_versions(&buf, mod); |
1da177e4 LT |
1676 | add_depends(&buf, mod, modules); |
1677 | add_moddevtable(&buf, mod); | |
1678 | add_srcversion(&buf, mod); | |
1679 | ||
1680 | sprintf(fname, "%s.mod.c", mod->name); | |
1681 | write_if_changed(&buf, fname); | |
1682 | } | |
1683 | ||
1684 | if (dump_write) | |
1685 | write_dump(dump_write); | |
1686 | ||
c53ddacd | 1687 | return err; |
1da177e4 | 1688 | } |