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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; | |
8d8d8289 SR |
26 | /* Warn about section mismatch in vmlinux if set to 1 */ |
27 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
28 | /* Only warn about unresolved symbols */ |
29 | static int warn_unresolved = 0; | |
bd5cbced | 30 | /* How a symbol is exported */ |
c96fca21 SR |
31 | enum export { |
32 | export_plain, export_unused, export_gpl, | |
33 | export_unused_gpl, export_gpl_future, export_unknown | |
34 | }; | |
1da177e4 | 35 | |
6d9a89ea AK |
36 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
37 | ||
38 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
39 | { |
40 | va_list arglist; | |
41 | ||
42 | fprintf(stderr, "FATAL: "); | |
43 | ||
44 | va_start(arglist, fmt); | |
45 | vfprintf(stderr, fmt, arglist); | |
46 | va_end(arglist); | |
47 | ||
48 | exit(1); | |
49 | } | |
50 | ||
6d9a89ea | 51 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
52 | { |
53 | va_list arglist; | |
54 | ||
55 | fprintf(stderr, "WARNING: "); | |
56 | ||
57 | va_start(arglist, fmt); | |
58 | vfprintf(stderr, fmt, arglist); | |
59 | va_end(arglist); | |
60 | } | |
61 | ||
6d9a89ea | 62 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
63 | { |
64 | va_list arglist; | |
65 | ||
66 | fprintf(stderr, "ERROR: "); | |
67 | ||
68 | va_start(arglist, fmt); | |
69 | vfprintf(stderr, fmt, arglist); | |
70 | va_end(arglist); | |
71 | } | |
72 | ||
040fcc81 SR |
73 | static int is_vmlinux(const char *modname) |
74 | { | |
75 | const char *myname; | |
76 | ||
77 | if ((myname = strrchr(modname, '/'))) | |
78 | myname++; | |
79 | else | |
80 | myname = modname; | |
81 | ||
741f98fe SR |
82 | return (strcmp(myname, "vmlinux") == 0) || |
83 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
84 | } |
85 | ||
1da177e4 LT |
86 | void *do_nofail(void *ptr, const char *expr) |
87 | { | |
88 | if (!ptr) { | |
89 | fatal("modpost: Memory allocation failure: %s.\n", expr); | |
90 | } | |
91 | return ptr; | |
92 | } | |
93 | ||
94 | /* A list of all modules we processed */ | |
95 | ||
96 | static struct module *modules; | |
97 | ||
5c3ead8c | 98 | static struct module *find_module(char *modname) |
1da177e4 LT |
99 | { |
100 | struct module *mod; | |
101 | ||
102 | for (mod = modules; mod; mod = mod->next) | |
103 | if (strcmp(mod->name, modname) == 0) | |
104 | break; | |
105 | return mod; | |
106 | } | |
107 | ||
5c3ead8c | 108 | static struct module *new_module(char *modname) |
1da177e4 LT |
109 | { |
110 | struct module *mod; | |
111 | char *p, *s; | |
62070fa4 | 112 | |
1da177e4 LT |
113 | mod = NOFAIL(malloc(sizeof(*mod))); |
114 | memset(mod, 0, sizeof(*mod)); | |
115 | p = NOFAIL(strdup(modname)); | |
116 | ||
117 | /* strip trailing .o */ | |
118 | if ((s = strrchr(p, '.')) != NULL) | |
119 | if (strcmp(s, ".o") == 0) | |
120 | *s = '\0'; | |
121 | ||
122 | /* add to list */ | |
123 | mod->name = p; | |
b817f6fe | 124 | mod->gpl_compatible = -1; |
1da177e4 LT |
125 | mod->next = modules; |
126 | modules = mod; | |
127 | ||
128 | return mod; | |
129 | } | |
130 | ||
131 | /* A hash of all exported symbols, | |
132 | * struct symbol is also used for lists of unresolved symbols */ | |
133 | ||
134 | #define SYMBOL_HASH_SIZE 1024 | |
135 | ||
136 | struct symbol { | |
137 | struct symbol *next; | |
138 | struct module *module; | |
139 | unsigned int crc; | |
140 | int crc_valid; | |
141 | unsigned int weak:1; | |
040fcc81 SR |
142 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
143 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
144 | * (only for external modules) **/ | |
8e70c458 | 145 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 146 | enum export export; /* Type of export */ |
1da177e4 LT |
147 | char name[0]; |
148 | }; | |
149 | ||
150 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
151 | ||
152 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
153 | static inline unsigned int tdb_hash(const char *name) | |
154 | { | |
155 | unsigned value; /* Used to compute the hash value. */ | |
156 | unsigned i; /* Used to cycle through random values. */ | |
157 | ||
158 | /* Set the initial value from the key size. */ | |
159 | for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++) | |
160 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); | |
161 | ||
162 | return (1103515243 * value + 12345); | |
163 | } | |
164 | ||
5c3ead8c SR |
165 | /** |
166 | * Allocate a new symbols for use in the hash of exported symbols or | |
167 | * the list of unresolved symbols per module | |
168 | **/ | |
169 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
170 | struct symbol *next) | |
1da177e4 LT |
171 | { |
172 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
173 | ||
174 | memset(s, 0, sizeof(*s)); | |
175 | strcpy(s->name, name); | |
176 | s->weak = weak; | |
177 | s->next = next; | |
178 | return s; | |
179 | } | |
180 | ||
181 | /* For the hash of exported symbols */ | |
bd5cbced RP |
182 | static struct symbol *new_symbol(const char *name, struct module *module, |
183 | enum export export) | |
1da177e4 LT |
184 | { |
185 | unsigned int hash; | |
186 | struct symbol *new; | |
187 | ||
188 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
189 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
190 | new->module = module; | |
bd5cbced | 191 | new->export = export; |
040fcc81 | 192 | return new; |
1da177e4 LT |
193 | } |
194 | ||
5c3ead8c | 195 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
196 | { |
197 | struct symbol *s; | |
198 | ||
199 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
200 | if (name[0] == '.') | |
201 | name++; | |
202 | ||
203 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) { | |
204 | if (strcmp(s->name, name) == 0) | |
205 | return s; | |
206 | } | |
207 | return NULL; | |
208 | } | |
209 | ||
bd5cbced RP |
210 | static struct { |
211 | const char *str; | |
212 | enum export export; | |
213 | } export_list[] = { | |
214 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 215 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 216 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 217 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
218 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
219 | { .str = "(unknown)", .export = export_unknown }, | |
220 | }; | |
221 | ||
222 | ||
223 | static const char *export_str(enum export ex) | |
224 | { | |
225 | return export_list[ex].str; | |
226 | } | |
227 | ||
228 | static enum export export_no(const char * s) | |
229 | { | |
230 | int i; | |
534b89a9 SR |
231 | if (!s) |
232 | return export_unknown; | |
bd5cbced RP |
233 | for (i = 0; export_list[i].export != export_unknown; i++) { |
234 | if (strcmp(export_list[i].str, s) == 0) | |
235 | return export_list[i].export; | |
236 | } | |
237 | return export_unknown; | |
238 | } | |
239 | ||
240 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
241 | { | |
242 | if (sec == elf->export_sec) | |
243 | return export_plain; | |
c96fca21 SR |
244 | else if (sec == elf->export_unused_sec) |
245 | return export_unused; | |
bd5cbced RP |
246 | else if (sec == elf->export_gpl_sec) |
247 | return export_gpl; | |
c96fca21 SR |
248 | else if (sec == elf->export_unused_gpl_sec) |
249 | return export_unused_gpl; | |
bd5cbced RP |
250 | else if (sec == elf->export_gpl_future_sec) |
251 | return export_gpl_future; | |
252 | else | |
253 | return export_unknown; | |
254 | } | |
255 | ||
5c3ead8c SR |
256 | /** |
257 | * Add an exported symbol - it may have already been added without a | |
258 | * CRC, in this case just update the CRC | |
259 | **/ | |
bd5cbced RP |
260 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
261 | enum export export) | |
1da177e4 LT |
262 | { |
263 | struct symbol *s = find_symbol(name); | |
264 | ||
265 | if (!s) { | |
bd5cbced | 266 | s = new_symbol(name, mod, export); |
8e70c458 SR |
267 | } else { |
268 | if (!s->preloaded) { | |
7b75b13c | 269 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
270 | "was in %s%s\n", mod->name, name, |
271 | s->module->name, | |
272 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
273 | } else { |
274 | /* In case Modules.symvers was out of date */ | |
275 | s->module = mod; | |
8e70c458 | 276 | } |
1da177e4 | 277 | } |
8e70c458 | 278 | s->preloaded = 0; |
040fcc81 SR |
279 | s->vmlinux = is_vmlinux(mod->name); |
280 | s->kernel = 0; | |
bd5cbced | 281 | s->export = export; |
040fcc81 SR |
282 | return s; |
283 | } | |
284 | ||
285 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 286 | unsigned int crc, enum export export) |
040fcc81 SR |
287 | { |
288 | struct symbol *s = find_symbol(name); | |
289 | ||
290 | if (!s) | |
bd5cbced | 291 | s = new_symbol(name, mod, export); |
040fcc81 SR |
292 | s->crc = crc; |
293 | s->crc_valid = 1; | |
1da177e4 LT |
294 | } |
295 | ||
5c3ead8c | 296 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
297 | { |
298 | struct stat st; | |
299 | void *map; | |
300 | int fd; | |
301 | ||
302 | fd = open(filename, O_RDONLY); | |
303 | if (fd < 0 || fstat(fd, &st) != 0) | |
304 | return NULL; | |
305 | ||
306 | *size = st.st_size; | |
307 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
308 | close(fd); | |
309 | ||
310 | if (map == MAP_FAILED) | |
311 | return NULL; | |
312 | return map; | |
313 | } | |
314 | ||
5c3ead8c SR |
315 | /** |
316 | * Return a copy of the next line in a mmap'ed file. | |
317 | * spaces in the beginning of the line is trimmed away. | |
318 | * Return a pointer to a static buffer. | |
319 | **/ | |
320 | char* get_next_line(unsigned long *pos, void *file, unsigned long size) | |
1da177e4 LT |
321 | { |
322 | static char line[4096]; | |
323 | int skip = 1; | |
324 | size_t len = 0; | |
325 | signed char *p = (signed char *)file + *pos; | |
326 | char *s = line; | |
327 | ||
328 | for (; *pos < size ; (*pos)++) | |
329 | { | |
330 | if (skip && isspace(*p)) { | |
331 | p++; | |
332 | continue; | |
333 | } | |
334 | skip = 0; | |
335 | if (*p != '\n' && (*pos < size)) { | |
336 | len++; | |
337 | *s++ = *p++; | |
338 | if (len > 4095) | |
339 | break; /* Too long, stop */ | |
340 | } else { | |
341 | /* End of string */ | |
342 | *s = '\0'; | |
343 | return line; | |
344 | } | |
345 | } | |
346 | /* End of buffer */ | |
347 | return NULL; | |
348 | } | |
349 | ||
5c3ead8c | 350 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
351 | { |
352 | munmap(file, size); | |
353 | } | |
354 | ||
85bd2fdd | 355 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
356 | { |
357 | unsigned int i; | |
85bd2fdd | 358 | Elf_Ehdr *hdr; |
1da177e4 LT |
359 | Elf_Shdr *sechdrs; |
360 | Elf_Sym *sym; | |
361 | ||
362 | hdr = grab_file(filename, &info->size); | |
363 | if (!hdr) { | |
364 | perror(filename); | |
6803dc0e | 365 | exit(1); |
1da177e4 LT |
366 | } |
367 | info->hdr = hdr; | |
85bd2fdd SR |
368 | if (info->size < sizeof(*hdr)) { |
369 | /* file too small, assume this is an empty .o file */ | |
370 | return 0; | |
371 | } | |
372 | /* Is this a valid ELF file? */ | |
373 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
374 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
375 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
376 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
377 | /* Not an ELF file - silently ignore it */ | |
378 | return 0; | |
379 | } | |
1da177e4 LT |
380 | /* Fix endianness in ELF header */ |
381 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
382 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
383 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
384 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
ae4ac123 | 385 | hdr->e_type = TO_NATIVE(hdr->e_type); |
1da177e4 LT |
386 | sechdrs = (void *)hdr + hdr->e_shoff; |
387 | info->sechdrs = sechdrs; | |
388 | ||
a83710e5 PS |
389 | /* Check if file offset is correct */ |
390 | if (hdr->e_shoff > info->size) { | |
58b7a68d | 391 | fatal("section header offset=%lu in file '%s' is bigger then filesize=%lu\n", (unsigned long)hdr->e_shoff, filename, info->size); |
a83710e5 PS |
392 | return 0; |
393 | } | |
394 | ||
1da177e4 LT |
395 | /* Fix endianness in section headers */ |
396 | for (i = 0; i < hdr->e_shnum; i++) { | |
397 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
398 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
399 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
400 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
401 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
ae4ac123 AN |
402 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); |
403 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
1da177e4 LT |
404 | } |
405 | /* Find symbol table. */ | |
406 | for (i = 1; i < hdr->e_shnum; i++) { | |
407 | const char *secstrings | |
408 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 409 | const char *secname; |
1da177e4 | 410 | |
85bd2fdd | 411 | if (sechdrs[i].sh_offset > info->size) { |
58b7a68d | 412 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > sizeof(*hrd)=%lu\n", filename, (unsigned long)sechdrs[i].sh_offset, sizeof(*hdr)); |
85bd2fdd SR |
413 | return 0; |
414 | } | |
bd5cbced RP |
415 | secname = secstrings + sechdrs[i].sh_name; |
416 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
417 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
418 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
419 | } else if (strcmp(secname, "__ksymtab") == 0) |
420 | info->export_sec = i; | |
c96fca21 SR |
421 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
422 | info->export_unused_sec = i; | |
bd5cbced RP |
423 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
424 | info->export_gpl_sec = i; | |
c96fca21 SR |
425 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
426 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
427 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
428 | info->export_gpl_future_sec = i; | |
429 | ||
1da177e4 LT |
430 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
431 | continue; | |
432 | ||
433 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 434 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 435 | + sechdrs[i].sh_size; |
62070fa4 | 436 | info->strtab = (void *)hdr + |
1da177e4 LT |
437 | sechdrs[sechdrs[i].sh_link].sh_offset; |
438 | } | |
439 | if (!info->symtab_start) { | |
cb80514d | 440 | fatal("%s has no symtab?\n", filename); |
1da177e4 LT |
441 | } |
442 | /* Fix endianness in symbols */ | |
443 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
444 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
445 | sym->st_name = TO_NATIVE(sym->st_name); | |
446 | sym->st_value = TO_NATIVE(sym->st_value); | |
447 | sym->st_size = TO_NATIVE(sym->st_size); | |
448 | } | |
85bd2fdd | 449 | return 1; |
1da177e4 LT |
450 | } |
451 | ||
5c3ead8c | 452 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
453 | { |
454 | release_file(info->hdr, info->size); | |
455 | } | |
456 | ||
f7b05e64 LY |
457 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
458 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 459 | |
5c3ead8c SR |
460 | static void handle_modversions(struct module *mod, struct elf_info *info, |
461 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
462 | { |
463 | unsigned int crc; | |
bd5cbced | 464 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
465 | |
466 | switch (sym->st_shndx) { | |
467 | case SHN_COMMON: | |
cb80514d | 468 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
469 | break; |
470 | case SHN_ABS: | |
471 | /* CRC'd symbol */ | |
472 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
473 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
474 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
475 | export); | |
1da177e4 LT |
476 | } |
477 | break; | |
478 | case SHN_UNDEF: | |
479 | /* undefined symbol */ | |
480 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
481 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
482 | break; | |
483 | /* ignore global offset table */ | |
484 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
485 | break; | |
486 | /* ignore __this_module, it will be resolved shortly */ | |
487 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
488 | break; | |
8d529014 BC |
489 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
490 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
491 | /* add compatibility with older glibc */ | |
492 | #ifndef STT_SPARC_REGISTER | |
493 | #define STT_SPARC_REGISTER STT_REGISTER | |
494 | #endif | |
1da177e4 LT |
495 | if (info->hdr->e_machine == EM_SPARC || |
496 | info->hdr->e_machine == EM_SPARCV9) { | |
497 | /* Ignore register directives. */ | |
8d529014 | 498 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 499 | break; |
62070fa4 SR |
500 | if (symname[0] == '.') { |
501 | char *munged = strdup(symname); | |
502 | munged[0] = '_'; | |
503 | munged[1] = toupper(munged[1]); | |
504 | symname = munged; | |
505 | } | |
1da177e4 LT |
506 | } |
507 | #endif | |
62070fa4 | 508 | |
1da177e4 LT |
509 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
510 | strlen(MODULE_SYMBOL_PREFIX)) == 0) | |
511 | mod->unres = alloc_symbol(symname + | |
512 | strlen(MODULE_SYMBOL_PREFIX), | |
513 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
514 | mod->unres); | |
515 | break; | |
516 | default: | |
517 | /* All exported symbols */ | |
518 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
519 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
520 | export); | |
1da177e4 LT |
521 | } |
522 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
523 | mod->has_init = 1; | |
524 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
525 | mod->has_cleanup = 1; | |
526 | break; | |
527 | } | |
528 | } | |
529 | ||
5c3ead8c SR |
530 | /** |
531 | * Parse tag=value strings from .modinfo section | |
532 | **/ | |
1da177e4 LT |
533 | static char *next_string(char *string, unsigned long *secsize) |
534 | { | |
535 | /* Skip non-zero chars */ | |
536 | while (string[0]) { | |
537 | string++; | |
538 | if ((*secsize)-- <= 1) | |
539 | return NULL; | |
540 | } | |
541 | ||
542 | /* Skip any zero padding. */ | |
543 | while (!string[0]) { | |
544 | string++; | |
545 | if ((*secsize)-- <= 1) | |
546 | return NULL; | |
547 | } | |
548 | return string; | |
549 | } | |
550 | ||
b817f6fe SR |
551 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
552 | const char *tag, char *info) | |
1da177e4 LT |
553 | { |
554 | char *p; | |
555 | unsigned int taglen = strlen(tag); | |
556 | unsigned long size = modinfo_len; | |
557 | ||
b817f6fe SR |
558 | if (info) { |
559 | size -= info - (char *)modinfo; | |
560 | modinfo = next_string(info, &size); | |
561 | } | |
562 | ||
1da177e4 LT |
563 | for (p = modinfo; p; p = next_string(p, &size)) { |
564 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
565 | return p + taglen + 1; | |
566 | } | |
567 | return NULL; | |
568 | } | |
569 | ||
b817f6fe SR |
570 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
571 | const char *tag) | |
572 | ||
573 | { | |
574 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
575 | } | |
576 | ||
4c8fbca5 SR |
577 | /** |
578 | * Test if string s ends in string sub | |
579 | * return 0 if match | |
580 | **/ | |
581 | static int strrcmp(const char *s, const char *sub) | |
582 | { | |
583 | int slen, sublen; | |
62070fa4 | 584 | |
4c8fbca5 SR |
585 | if (!s || !sub) |
586 | return 1; | |
62070fa4 | 587 | |
4c8fbca5 SR |
588 | slen = strlen(s); |
589 | sublen = strlen(sub); | |
62070fa4 | 590 | |
4c8fbca5 SR |
591 | if ((slen == 0) || (sublen == 0)) |
592 | return 1; | |
593 | ||
594 | if (sublen > slen) | |
595 | return 1; | |
596 | ||
597 | return memcmp(s + slen - sublen, sub, sublen); | |
598 | } | |
599 | ||
2f5ee619 SR |
600 | /* |
601 | * Functions used only during module init is marked __init and is stored in | |
602 | * a .init.text section. Likewise data is marked __initdata and stored in | |
603 | * a .init.data section. | |
604 | * If this section is one of these sections return 1 | |
605 | * See include/linux/init.h for the details | |
606 | */ | |
607 | static int init_section(const char *name) | |
608 | { | |
609 | if (strcmp(name, ".init") == 0) | |
610 | return 1; | |
611 | if (strncmp(name, ".init.", strlen(".init.")) == 0) | |
612 | return 1; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Functions used only during module exit is marked __exit and is stored in | |
618 | * a .exit.text section. Likewise data is marked __exitdata and stored in | |
619 | * a .exit.data section. | |
620 | * If this section is one of these sections return 1 | |
621 | * See include/linux/init.h for the details | |
622 | **/ | |
623 | static int exit_section(const char *name) | |
624 | { | |
625 | if (strcmp(name, ".exit.text") == 0) | |
626 | return 1; | |
627 | if (strcmp(name, ".exit.data") == 0) | |
628 | return 1; | |
629 | return 0; | |
630 | ||
631 | } | |
632 | ||
633 | /* | |
634 | * Data sections are named like this: | |
635 | * .data | .data.rel | .data.rel.* | |
636 | * Return 1 if the specified section is a data section | |
637 | */ | |
638 | static int data_section(const char *name) | |
639 | { | |
640 | if ((strcmp(name, ".data") == 0) || | |
641 | (strcmp(name, ".data.rel") == 0) || | |
642 | (strncmp(name, ".data.rel.", strlen(".data.rel.")) == 0)) | |
643 | return 1; | |
644 | else | |
645 | return 0; | |
646 | } | |
647 | ||
4c8fbca5 SR |
648 | /** |
649 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e SR |
650 | * |
651 | * Pattern 0: | |
652 | * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. | |
653 | * The pattern is identified by: | |
cb7e51d8 | 654 | * fromsec = .text.init.refok* | .data.init.refok* |
0e0d314e | 655 | * |
4c8fbca5 SR |
656 | * Pattern 1: |
657 | * If a module parameter is declared __initdata and permissions=0 | |
658 | * then this is legal despite the warning generated. | |
659 | * We cannot see value of permissions here, so just ignore | |
660 | * this pattern. | |
661 | * The pattern is identified by: | |
662 | * tosec = .init.data | |
9209aed0 | 663 | * fromsec = .data* |
4c8fbca5 | 664 | * atsym =__param* |
62070fa4 | 665 | * |
4c8fbca5 | 666 | * Pattern 2: |
72ee59b5 | 667 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
668 | * add, remove, probe functions etc. |
669 | * These functions may often be marked __init and we do not want to | |
670 | * warn here. | |
671 | * the pattern is identified by: | |
83cda2bb SR |
672 | * tosec = init or exit section |
673 | * fromsec = data section | |
1e29a706 | 674 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console, *_timer |
ee6a8545 VG |
675 | * |
676 | * Pattern 3: | |
9bf8cb9b SR |
677 | * Whitelist all refereces from .text.head to .init.data |
678 | * Whitelist all refereces from .text.head to .init.text | |
679 | * | |
1d8af559 | 680 | * Pattern 4: |
ee6a8545 VG |
681 | * Some symbols belong to init section but still it is ok to reference |
682 | * these from non-init sections as these symbols don't have any memory | |
683 | * allocated for them and symbol address and value are same. So even | |
684 | * if init section is freed, its ok to reference those symbols. | |
685 | * For ex. symbols marking the init section boundaries. | |
686 | * This pattern is identified by | |
687 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 688 | * |
cb7e51d8 SR |
689 | * Pattern 5: |
690 | * Xtensa uses literal sections for constants that are accessed PC-relative. | |
691 | * Literal sections may safely reference their text sections. | |
692 | * (Note that the name for the literal section omits any trailing '.text') | |
693 | * tosec = <section>[.text] | |
694 | * fromsec = <section>.literal | |
4c8fbca5 | 695 | **/ |
9e157a5a | 696 | static int secref_whitelist(const char *modname, const char *tosec, |
ee6a8545 VG |
697 | const char *fromsec, const char *atsym, |
698 | const char *refsymname) | |
4c8fbca5 | 699 | { |
cb7e51d8 | 700 | int len; |
4c8fbca5 SR |
701 | const char **s; |
702 | const char *pat2sym[] = { | |
72ee59b5 | 703 | "driver", |
5ecdd0f6 | 704 | "_template", /* scsi uses *_template a lot */ |
1e29a706 | 705 | "_timer", /* arm uses ops structures named _timer a lot */ |
5ecdd0f6 | 706 | "_sht", /* scsi also used *_sht to some extent */ |
4c8fbca5 SR |
707 | "_ops", |
708 | "_probe", | |
709 | "_probe_one", | |
118c0ace | 710 | "_console", |
4c8fbca5 SR |
711 | NULL |
712 | }; | |
62070fa4 | 713 | |
ee6a8545 VG |
714 | const char *pat3refsym[] = { |
715 | "__init_begin", | |
716 | "_sinittext", | |
717 | "_einittext", | |
718 | NULL | |
719 | }; | |
720 | ||
0e0d314e | 721 | /* Check for pattern 0 */ |
cb7e51d8 | 722 | if ((strncmp(fromsec, ".text.init.refok", strlen(".text.init.refok")) == 0) || |
4665079c | 723 | (strncmp(fromsec, ".exit.text.refok", strlen(".exit.text.refok")) == 0) || |
cb7e51d8 | 724 | (strncmp(fromsec, ".data.init.refok", strlen(".data.init.refok")) == 0)) |
0e0d314e SR |
725 | return 1; |
726 | ||
4c8fbca5 | 727 | /* Check for pattern 1 */ |
83cda2bb SR |
728 | if ((strcmp(tosec, ".init.data") == 0) && |
729 | (strncmp(fromsec, ".data", strlen(".data")) == 0) && | |
730 | (strncmp(atsym, "__param", strlen("__param")) == 0)) | |
731 | return 1; | |
4c8fbca5 SR |
732 | |
733 | /* Check for pattern 2 */ | |
83cda2bb SR |
734 | if ((init_section(tosec) || exit_section(tosec)) && data_section(fromsec)) |
735 | for (s = pat2sym; *s; s++) | |
736 | if (strrcmp(atsym, *s) == 0) | |
737 | return 1; | |
4c8fbca5 | 738 | |
9bf8cb9b | 739 | /* Check for pattern 3 */ |
9bf8cb9b SR |
740 | if ((strcmp(fromsec, ".text.head") == 0) && |
741 | ((strcmp(tosec, ".init.data") == 0) || | |
742 | (strcmp(tosec, ".init.text") == 0))) | |
743 | return 1; | |
744 | ||
1d8af559 | 745 | /* Check for pattern 4 */ |
9bf8cb9b SR |
746 | for (s = pat3refsym; *s; s++) |
747 | if (strcmp(refsymname, *s) == 0) | |
748 | return 1; | |
749 | ||
cb7e51d8 SR |
750 | /* Check for pattern 5 */ |
751 | if (strrcmp(tosec, ".text") == 0) | |
752 | len = strlen(tosec) - strlen(".text"); | |
753 | else | |
754 | len = strlen(tosec); | |
755 | if ((strncmp(tosec, fromsec, len) == 0) && (strlen(fromsec) > len) && | |
756 | (strcmp(fromsec + len, ".literal") == 0)) | |
757 | return 1; | |
758 | ||
93659af1 | 759 | return 0; |
4c8fbca5 SR |
760 | } |
761 | ||
93684d3b SR |
762 | /** |
763 | * Find symbol based on relocation record info. | |
764 | * In some cases the symbol supplied is a valid symbol so | |
765 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
766 | * In other cases the symbol needs to be looked up in the symbol table | |
767 | * based on section and address. | |
768 | * **/ | |
769 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr, | |
770 | Elf_Sym *relsym) | |
771 | { | |
772 | Elf_Sym *sym; | |
773 | ||
774 | if (relsym->st_name != 0) | |
775 | return relsym; | |
776 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
777 | if (sym->st_shndx != relsym->st_shndx) | |
778 | continue; | |
ae4ac123 AN |
779 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
780 | continue; | |
93684d3b SR |
781 | if (sym->st_value == addr) |
782 | return sym; | |
783 | } | |
784 | return NULL; | |
785 | } | |
786 | ||
da68d61f DB |
787 | static inline int is_arm_mapping_symbol(const char *str) |
788 | { | |
789 | return str[0] == '$' && strchr("atd", str[1]) | |
790 | && (str[2] == '\0' || str[2] == '.'); | |
791 | } | |
792 | ||
793 | /* | |
794 | * If there's no name there, ignore it; likewise, ignore it if it's | |
795 | * one of the magic symbols emitted used by current ARM tools. | |
796 | * | |
797 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
798 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
799 | * only by merging __exit and __init sections into __text, bloating | |
800 | * the kernel (which is especially evil on embedded platforms). | |
801 | */ | |
802 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
803 | { | |
804 | const char *name = elf->strtab + sym->st_name; | |
805 | ||
806 | if (!name || !strlen(name)) | |
807 | return 0; | |
808 | return !is_arm_mapping_symbol(name); | |
809 | } | |
810 | ||
b39927cf | 811 | /* |
43c74d17 SR |
812 | * Find symbols before or equal addr and after addr - in the section sec. |
813 | * If we find two symbols with equal offset prefer one with a valid name. | |
814 | * The ELF format may have a better way to detect what type of symbol | |
815 | * it is, but this works for now. | |
b39927cf SR |
816 | **/ |
817 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
818 | const char *sec, | |
819 | Elf_Sym **before, Elf_Sym **after) | |
820 | { | |
821 | Elf_Sym *sym; | |
822 | Elf_Ehdr *hdr = elf->hdr; | |
823 | Elf_Addr beforediff = ~0; | |
824 | Elf_Addr afterdiff = ~0; | |
825 | const char *secstrings = (void *)hdr + | |
826 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 827 | |
b39927cf SR |
828 | *before = NULL; |
829 | *after = NULL; | |
830 | ||
831 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
832 | const char *symsec; | |
833 | ||
834 | if (sym->st_shndx >= SHN_LORESERVE) | |
835 | continue; | |
836 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
837 | if (strcmp(symsec, sec) != 0) | |
838 | continue; | |
da68d61f DB |
839 | if (!is_valid_name(elf, sym)) |
840 | continue; | |
b39927cf SR |
841 | if (sym->st_value <= addr) { |
842 | if ((addr - sym->st_value) < beforediff) { | |
843 | beforediff = addr - sym->st_value; | |
844 | *before = sym; | |
845 | } | |
43c74d17 | 846 | else if ((addr - sym->st_value) == beforediff) { |
da68d61f | 847 | *before = sym; |
43c74d17 | 848 | } |
b39927cf SR |
849 | } |
850 | else | |
851 | { | |
852 | if ((sym->st_value - addr) < afterdiff) { | |
853 | afterdiff = sym->st_value - addr; | |
854 | *after = sym; | |
855 | } | |
43c74d17 | 856 | else if ((sym->st_value - addr) == afterdiff) { |
da68d61f | 857 | *after = sym; |
43c74d17 | 858 | } |
b39927cf SR |
859 | } |
860 | } | |
861 | } | |
862 | ||
863 | /** | |
864 | * Print a warning about a section mismatch. | |
865 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 866 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
867 | **/ |
868 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
869 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
870 | { | |
93684d3b SR |
871 | const char *refsymname = ""; |
872 | Elf_Sym *before, *after; | |
873 | Elf_Sym *refsym; | |
b39927cf SR |
874 | Elf_Ehdr *hdr = elf->hdr; |
875 | Elf_Shdr *sechdrs = elf->sechdrs; | |
876 | const char *secstrings = (void *)hdr + | |
877 | sechdrs[hdr->e_shstrndx].sh_offset; | |
878 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 879 | |
b39927cf SR |
880 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
881 | ||
93684d3b SR |
882 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
883 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
884 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
885 | |
886 | /* check whitelist - we may ignore it */ | |
cb7e51d8 SR |
887 | if (secref_whitelist(modname, secname, fromsec, |
888 | before ? elf->strtab + before->st_name : "", | |
889 | refsymname)) | |
4c8fbca5 | 890 | return; |
62070fa4 | 891 | |
b39927cf | 892 | if (before && after) { |
25601209 RK |
893 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
894 | "(between '%s' and '%s')\n", | |
895 | modname, fromsec, (unsigned long long)r.r_offset, | |
896 | secname, refsymname, | |
b39927cf | 897 | elf->strtab + before->st_name, |
b39927cf SR |
898 | elf->strtab + after->st_name); |
899 | } else if (before) { | |
25601209 RK |
900 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
901 | "(after '%s')\n", | |
902 | modname, fromsec, (unsigned long long)r.r_offset, | |
903 | secname, refsymname, | |
904 | elf->strtab + before->st_name); | |
b39927cf | 905 | } else if (after) { |
25601209 | 906 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
93684d3b | 907 | "before '%s' (at offset -0x%llx)\n", |
25601209 RK |
908 | modname, fromsec, (unsigned long long)r.r_offset, |
909 | secname, refsymname, | |
58b7a68d AK |
910 | elf->strtab + after->st_name, |
911 | (unsigned long long)r.r_offset); | |
b39927cf | 912 | } else { |
25601209 RK |
913 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n", |
914 | modname, fromsec, (unsigned long long)r.r_offset, | |
915 | secname, refsymname); | |
b39927cf SR |
916 | } |
917 | } | |
918 | ||
ae4ac123 AN |
919 | static unsigned int *reloc_location(struct elf_info *elf, |
920 | int rsection, Elf_Rela *r) | |
921 | { | |
922 | Elf_Shdr *sechdrs = elf->sechdrs; | |
923 | int section = sechdrs[rsection].sh_info; | |
924 | ||
925 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
926 | (r->r_offset - sechdrs[section].sh_addr); | |
927 | } | |
928 | ||
929 | static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r) | |
930 | { | |
931 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
932 | unsigned int *location = reloc_location(elf, rsection, r); | |
933 | ||
934 | switch (r_typ) { | |
935 | case R_386_32: | |
936 | r->r_addend = TO_NATIVE(*location); | |
937 | break; | |
938 | case R_386_PC32: | |
939 | r->r_addend = TO_NATIVE(*location) + 4; | |
940 | /* For CONFIG_RELOCATABLE=y */ | |
941 | if (elf->hdr->e_type == ET_EXEC) | |
942 | r->r_addend += r->r_offset; | |
943 | break; | |
944 | } | |
945 | return 0; | |
946 | } | |
947 | ||
56a974fa SR |
948 | static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
949 | { | |
950 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
951 | ||
952 | switch (r_typ) { | |
953 | case R_ARM_ABS32: | |
954 | /* From ARM ABI: (S + A) | T */ | |
955 | r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info)); | |
956 | break; | |
957 | case R_ARM_PC24: | |
958 | /* From ARM ABI: ((S + A) | T) - P */ | |
959 | r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset + | |
960 | (r->r_offset - elf->sechdrs[rsection].sh_addr)); | |
961 | break; | |
962 | default: | |
963 | return 1; | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | ||
ae4ac123 AN |
968 | static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r) |
969 | { | |
970 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
971 | unsigned int *location = reloc_location(elf, rsection, r); | |
972 | unsigned int inst; | |
973 | ||
974 | if (r_typ == R_MIPS_HI16) | |
975 | return 1; /* skip this */ | |
976 | inst = TO_NATIVE(*location); | |
977 | switch (r_typ) { | |
978 | case R_MIPS_LO16: | |
979 | r->r_addend = inst & 0xffff; | |
980 | break; | |
981 | case R_MIPS_26: | |
982 | r->r_addend = (inst & 0x03ffffff) << 2; | |
983 | break; | |
984 | case R_MIPS_32: | |
985 | r->r_addend = inst; | |
986 | break; | |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
b39927cf SR |
991 | /** |
992 | * A module includes a number of sections that are discarded | |
993 | * either when loaded or when used as built-in. | |
994 | * For loaded modules all functions marked __init and all data | |
995 | * marked __initdata will be discarded when the module has been intialized. | |
996 | * Likewise for modules used built-in the sections marked __exit | |
997 | * are discarded because __exit marked function are supposed to be called | |
998 | * only when a moduel is unloaded which never happes for built-in modules. | |
999 | * The check_sec_ref() function traverses all relocation records | |
1000 | * to find all references to a section that reference a section that will | |
1001 | * be discarded and warns about it. | |
1002 | **/ | |
1003 | static void check_sec_ref(struct module *mod, const char *modname, | |
1004 | struct elf_info *elf, | |
1005 | int section(const char*), | |
1006 | int section_ref_ok(const char *)) | |
1007 | { | |
1008 | int i; | |
1009 | Elf_Sym *sym; | |
1010 | Elf_Ehdr *hdr = elf->hdr; | |
1011 | Elf_Shdr *sechdrs = elf->sechdrs; | |
1012 | const char *secstrings = (void *)hdr + | |
1013 | sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 1014 | |
b39927cf SR |
1015 | /* Walk through all sections */ |
1016 | for (i = 0; i < hdr->e_shnum; i++) { | |
2c1a51f3 AN |
1017 | const char *name = secstrings + sechdrs[i].sh_name; |
1018 | const char *secname; | |
1019 | Elf_Rela r; | |
eae07ac6 | 1020 | unsigned int r_sym; |
b39927cf | 1021 | /* We want to process only relocation sections and not .init */ |
2c1a51f3 AN |
1022 | if (sechdrs[i].sh_type == SHT_RELA) { |
1023 | Elf_Rela *rela; | |
1024 | Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset; | |
1025 | Elf_Rela *stop = (void*)start + sechdrs[i].sh_size; | |
1026 | name += strlen(".rela"); | |
1027 | if (section_ref_ok(name)) | |
1028 | continue; | |
b39927cf | 1029 | |
2c1a51f3 AN |
1030 | for (rela = start; rela < stop; rela++) { |
1031 | r.r_offset = TO_NATIVE(rela->r_offset); | |
eae07ac6 AN |
1032 | #if KERNEL_ELFCLASS == ELFCLASS64 |
1033 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 1034 | unsigned int r_typ; |
eae07ac6 AN |
1035 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
1036 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
1037 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); |
1038 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
1039 | } else { |
1040 | r.r_info = TO_NATIVE(rela->r_info); | |
1041 | r_sym = ELF_R_SYM(r.r_info); | |
1042 | } | |
1043 | #else | |
1044 | r.r_info = TO_NATIVE(rela->r_info); | |
1045 | r_sym = ELF_R_SYM(r.r_info); | |
1046 | #endif | |
2c1a51f3 | 1047 | r.r_addend = TO_NATIVE(rela->r_addend); |
eae07ac6 | 1048 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
1049 | /* Skip special sections */ |
1050 | if (sym->st_shndx >= SHN_LORESERVE) | |
1051 | continue; | |
1052 | ||
1053 | secname = secstrings + | |
1054 | sechdrs[sym->st_shndx].sh_name; | |
1055 | if (section(secname)) | |
1056 | warn_sec_mismatch(modname, name, | |
1057 | elf, sym, r); | |
1058 | } | |
1059 | } else if (sechdrs[i].sh_type == SHT_REL) { | |
1060 | Elf_Rel *rel; | |
1061 | Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset; | |
1062 | Elf_Rel *stop = (void*)start + sechdrs[i].sh_size; | |
1063 | name += strlen(".rel"); | |
1064 | if (section_ref_ok(name)) | |
b39927cf SR |
1065 | continue; |
1066 | ||
2c1a51f3 AN |
1067 | for (rel = start; rel < stop; rel++) { |
1068 | r.r_offset = TO_NATIVE(rel->r_offset); | |
eae07ac6 AN |
1069 | #if KERNEL_ELFCLASS == ELFCLASS64 |
1070 | if (hdr->e_machine == EM_MIPS) { | |
ae4ac123 | 1071 | unsigned int r_typ; |
eae07ac6 AN |
1072 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
1073 | r_sym = TO_NATIVE(r_sym); | |
ae4ac123 AN |
1074 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); |
1075 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
eae07ac6 AN |
1076 | } else { |
1077 | r.r_info = TO_NATIVE(rel->r_info); | |
1078 | r_sym = ELF_R_SYM(r.r_info); | |
1079 | } | |
1080 | #else | |
1081 | r.r_info = TO_NATIVE(rel->r_info); | |
1082 | r_sym = ELF_R_SYM(r.r_info); | |
1083 | #endif | |
2c1a51f3 | 1084 | r.r_addend = 0; |
ae4ac123 AN |
1085 | switch (hdr->e_machine) { |
1086 | case EM_386: | |
1087 | if (addend_386_rel(elf, i, &r)) | |
1088 | continue; | |
1089 | break; | |
56a974fa SR |
1090 | case EM_ARM: |
1091 | if(addend_arm_rel(elf, i, &r)) | |
1092 | continue; | |
1093 | break; | |
ae4ac123 AN |
1094 | case EM_MIPS: |
1095 | if (addend_mips_rel(elf, i, &r)) | |
1096 | continue; | |
1097 | break; | |
1098 | } | |
eae07ac6 | 1099 | sym = elf->symtab_start + r_sym; |
2c1a51f3 AN |
1100 | /* Skip special sections */ |
1101 | if (sym->st_shndx >= SHN_LORESERVE) | |
1102 | continue; | |
1103 | ||
1104 | secname = secstrings + | |
1105 | sechdrs[sym->st_shndx].sh_name; | |
1106 | if (section(secname)) | |
1107 | warn_sec_mismatch(modname, name, | |
1108 | elf, sym, r); | |
1109 | } | |
b39927cf SR |
1110 | } |
1111 | } | |
1112 | } | |
1113 | ||
1087247b SR |
1114 | /* |
1115 | * Identify sections from which references to either a | |
1116 | * .init or a .exit section is OK. | |
1117 | * | |
1118 | * [OPD] Keith Ownes <kaos@sgi.com> commented: | |
1119 | * For our future {in}sanity, add a comment that this is the ppc .opd | |
1120 | * section, not the ia64 .opd section. | |
1121 | * ia64 .opd should not point to discarded sections. | |
1122 | * [.rodata] like for .init.text we ignore .rodata references -same reason | |
1d8af559 | 1123 | */ |
1087247b SR |
1124 | static int initexit_section_ref_ok(const char *name) |
1125 | { | |
1126 | const char **s; | |
1127 | /* Absolute section names */ | |
1128 | const char *namelist1[] = { | |
1129 | "__bug_table", /* used by powerpc for BUG() */ | |
1130 | "__ex_table", | |
1131 | ".altinstructions", | |
1132 | ".cranges", /* used by sh64 */ | |
1133 | ".fixup", | |
1d8af559 SR |
1134 | ".machvec", /* ia64 + powerpc uses these */ |
1135 | ".machine.desc", | |
1087247b | 1136 | ".opd", /* See comment [OPD] */ |
ad0b1427 | 1137 | "__dbe_table", |
1087247b SR |
1138 | ".parainstructions", |
1139 | ".pdr", | |
1140 | ".plt", /* seen on ARCH=um build on x86_64. Harmless */ | |
1141 | ".smp_locks", | |
1142 | ".stab", | |
3a5df1d4 | 1143 | ".m68k_fixup", |
cb7e51d8 SR |
1144 | ".xt.prop", /* xtensa informational section */ |
1145 | ".xt.lit", /* xtensa informational section */ | |
1087247b SR |
1146 | NULL |
1147 | }; | |
1148 | /* Start of section names */ | |
1149 | const char *namelist2[] = { | |
1150 | ".debug", | |
1151 | ".eh_frame", | |
1152 | ".note", /* ignore ELF notes - may contain anything */ | |
1153 | ".got", /* powerpc - global offset table */ | |
1154 | ".toc", /* powerpc - table of contents */ | |
1155 | NULL | |
1156 | }; | |
1157 | /* part of section name */ | |
1158 | const char *namelist3 [] = { | |
1159 | ".unwind", /* Sample: IA_64.unwind.exit.text */ | |
1160 | NULL | |
1161 | }; | |
1162 | ||
1163 | for (s = namelist1; *s; s++) | |
1164 | if (strcmp(*s, name) == 0) | |
1165 | return 1; | |
1166 | for (s = namelist2; *s; s++) | |
1167 | if (strncmp(*s, name, strlen(*s)) == 0) | |
1168 | return 1; | |
1169 | for (s = namelist3; *s; s++) | |
1170 | if (strstr(name, *s) != NULL) | |
1171 | return 1; | |
1172 | return 0; | |
1173 | } | |
1174 | ||
b39927cf | 1175 | |
1087247b | 1176 | /* |
b39927cf | 1177 | * Identify sections from which references to a .init section is OK. |
62070fa4 | 1178 | * |
b39927cf SR |
1179 | * Unfortunately references to read only data that referenced .init |
1180 | * sections had to be excluded. Almost all of these are false | |
1181 | * positives, they are created by gcc. The downside of excluding rodata | |
1182 | * is that there really are some user references from rodata to | |
1183 | * init code, e.g. drivers/video/vgacon.c: | |
62070fa4 | 1184 | * |
b39927cf SR |
1185 | * const struct consw vga_con = { |
1186 | * con_startup: vgacon_startup, | |
1187 | * | |
1188 | * where vgacon_startup is __init. If you want to wade through the false | |
1189 | * positives, take out the check for rodata. | |
1087247b | 1190 | */ |
b39927cf SR |
1191 | static int init_section_ref_ok(const char *name) |
1192 | { | |
1193 | const char **s; | |
1194 | /* Absolute section names */ | |
1195 | const char *namelist1[] = { | |
eec73e88 | 1196 | "__dbe_table", /* MIPS generate these */ |
21c4ff80 BH |
1197 | "__ftr_fixup", /* powerpc cpu feature fixup */ |
1198 | "__fw_ftr_fixup", /* powerpc firmware feature fixup */ | |
1087247b SR |
1199 | "__param", |
1200 | ".data.rel.ro", /* used by parisc64 */ | |
1201 | ".init", | |
1202 | ".text.lock", | |
b39927cf SR |
1203 | NULL |
1204 | }; | |
1205 | /* Start of section names */ | |
1206 | const char *namelist2[] = { | |
1207 | ".init.", | |
1087247b | 1208 | ".pci_fixup", |
742433b0 | 1209 | ".rodata", |
6e10133f SR |
1210 | NULL |
1211 | }; | |
1212 | ||
1087247b SR |
1213 | if (initexit_section_ref_ok(name)) |
1214 | return 1; | |
1215 | ||
b39927cf SR |
1216 | for (s = namelist1; *s; s++) |
1217 | if (strcmp(*s, name) == 0) | |
1218 | return 1; | |
62070fa4 | 1219 | for (s = namelist2; *s; s++) |
b39927cf SR |
1220 | if (strncmp(*s, name, strlen(*s)) == 0) |
1221 | return 1; | |
1087247b SR |
1222 | |
1223 | /* If section name ends with ".init" we allow references | |
1224 | * as is the case with .initcallN.init, .early_param.init, .taglist.init etc | |
1225 | */ | |
468d9494 AV |
1226 | if (strrcmp(name, ".init") == 0) |
1227 | return 1; | |
b39927cf SR |
1228 | return 0; |
1229 | } | |
1230 | ||
b39927cf SR |
1231 | /* |
1232 | * Identify sections from which references to a .exit section is OK. | |
1087247b | 1233 | */ |
b39927cf SR |
1234 | static int exit_section_ref_ok(const char *name) |
1235 | { | |
1236 | const char **s; | |
1237 | /* Absolute section names */ | |
1238 | const char *namelist1[] = { | |
b39927cf | 1239 | ".exit.data", |
1087247b SR |
1240 | ".exit.text", |
1241 | ".exitcall.exit", | |
5ecdd0f6 | 1242 | ".rodata", |
6e10133f SR |
1243 | NULL |
1244 | }; | |
62070fa4 | 1245 | |
1087247b SR |
1246 | if (initexit_section_ref_ok(name)) |
1247 | return 1; | |
1248 | ||
b39927cf SR |
1249 | for (s = namelist1; *s; s++) |
1250 | if (strcmp(*s, name) == 0) | |
1251 | return 1; | |
b39927cf SR |
1252 | return 0; |
1253 | } | |
1254 | ||
5c3ead8c | 1255 | static void read_symbols(char *modname) |
1da177e4 LT |
1256 | { |
1257 | const char *symname; | |
1258 | char *version; | |
b817f6fe | 1259 | char *license; |
1da177e4 LT |
1260 | struct module *mod; |
1261 | struct elf_info info = { }; | |
1262 | Elf_Sym *sym; | |
1263 | ||
85bd2fdd SR |
1264 | if (!parse_elf(&info, modname)) |
1265 | return; | |
1da177e4 LT |
1266 | |
1267 | mod = new_module(modname); | |
1268 | ||
1269 | /* When there's no vmlinux, don't print warnings about | |
1270 | * unresolved symbols (since there'll be too many ;) */ | |
1271 | if (is_vmlinux(modname)) { | |
1da177e4 | 1272 | have_vmlinux = 1; |
1da177e4 LT |
1273 | mod->skip = 1; |
1274 | } | |
1275 | ||
b817f6fe SR |
1276 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1277 | while (license) { | |
1278 | if (license_is_gpl_compatible(license)) | |
1279 | mod->gpl_compatible = 1; | |
1280 | else { | |
1281 | mod->gpl_compatible = 0; | |
1282 | break; | |
1283 | } | |
1284 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1285 | "license", license); | |
1286 | } | |
1287 | ||
1da177e4 LT |
1288 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1289 | symname = info.strtab + sym->st_name; | |
1290 | ||
1291 | handle_modversions(mod, &info, sym, symname); | |
1292 | handle_moddevtable(mod, &info, sym, symname); | |
1293 | } | |
8d8d8289 SR |
1294 | if (is_vmlinux(modname) && vmlinux_section_warnings) { |
1295 | check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok); | |
1296 | check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok); | |
1297 | } | |
1da177e4 LT |
1298 | |
1299 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1300 | if (version) | |
1301 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1302 | version - (char *)info.hdr); | |
1303 | if (version || (all_versions && !is_vmlinux(modname))) | |
1304 | get_src_version(modname, mod->srcversion, | |
1305 | sizeof(mod->srcversion)-1); | |
1306 | ||
1307 | parse_elf_finish(&info); | |
1308 | ||
1309 | /* Our trick to get versioning for struct_module - it's | |
1310 | * never passed as an argument to an exported function, so | |
1311 | * the automatic versioning doesn't pick it up, but it's really | |
1312 | * important anyhow */ | |
1313 | if (modversions) | |
1314 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1315 | } | |
1316 | ||
1317 | #define SZ 500 | |
1318 | ||
1319 | /* We first write the generated file into memory using the | |
1320 | * following helper, then compare to the file on disk and | |
1321 | * only update the later if anything changed */ | |
1322 | ||
5c3ead8c SR |
1323 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1324 | const char *fmt, ...) | |
1da177e4 LT |
1325 | { |
1326 | char tmp[SZ]; | |
1327 | int len; | |
1328 | va_list ap; | |
62070fa4 | 1329 | |
1da177e4 LT |
1330 | va_start(ap, fmt); |
1331 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1332 | buf_write(buf, tmp, len); |
1da177e4 LT |
1333 | va_end(ap); |
1334 | } | |
1335 | ||
5c3ead8c | 1336 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1337 | { |
1338 | if (buf->size - buf->pos < len) { | |
7670f023 | 1339 | buf->size += len + SZ; |
1da177e4 LT |
1340 | buf->p = realloc(buf->p, buf->size); |
1341 | } | |
1342 | strncpy(buf->p + buf->pos, s, len); | |
1343 | buf->pos += len; | |
1344 | } | |
1345 | ||
c96fca21 SR |
1346 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1347 | { | |
1348 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1349 | ||
1350 | switch (exp) { | |
1351 | case export_gpl: | |
1352 | fatal("modpost: GPL-incompatible module %s%s " | |
1353 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1354 | break; | |
1355 | case export_unused_gpl: | |
1356 | fatal("modpost: GPL-incompatible module %s%s " | |
1357 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1358 | break; | |
1359 | case export_gpl_future: | |
1360 | warn("modpost: GPL-incompatible module %s%s " | |
1361 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1362 | break; | |
1363 | case export_plain: | |
1364 | case export_unused: | |
1365 | case export_unknown: | |
1366 | /* ignore */ | |
1367 | break; | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | static void check_for_unused(enum export exp, const char* m, const char* s) | |
1372 | { | |
1373 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1374 | ||
1375 | switch (exp) { | |
1376 | case export_unused: | |
1377 | case export_unused_gpl: | |
1378 | warn("modpost: module %s%s " | |
1379 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1380 | break; | |
1381 | default: | |
1382 | /* ignore */ | |
1383 | break; | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1388 | { |
1389 | struct symbol *s, *exp; | |
1390 | ||
1391 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1392 | const char *basename; |
b817f6fe SR |
1393 | exp = find_symbol(s->name); |
1394 | if (!exp || exp->module == mod) | |
1395 | continue; | |
6449bd62 | 1396 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1397 | if (basename) |
1398 | basename++; | |
c96fca21 SR |
1399 | else |
1400 | basename = mod->name; | |
1401 | if (!mod->gpl_compatible) | |
1402 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1403 | check_for_unused(exp->export, basename, exp->name); | |
b817f6fe SR |
1404 | } |
1405 | } | |
1406 | ||
5c3ead8c SR |
1407 | /** |
1408 | * Header for the generated file | |
1409 | **/ | |
1410 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1411 | { |
1412 | buf_printf(b, "#include <linux/module.h>\n"); | |
1413 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1414 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1415 | buf_printf(b, "\n"); | |
1416 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1417 | buf_printf(b, "\n"); | |
1da177e4 LT |
1418 | buf_printf(b, "struct module __this_module\n"); |
1419 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1420 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1421 | if (mod->has_init) |
1422 | buf_printf(b, " .init = init_module,\n"); | |
1423 | if (mod->has_cleanup) | |
1424 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1425 | " .exit = cleanup_module,\n" | |
1426 | "#endif\n"); | |
e61a1c1c | 1427 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1428 | buf_printf(b, "};\n"); |
1429 | } | |
1430 | ||
5c3ead8c SR |
1431 | /** |
1432 | * Record CRCs for unresolved symbols | |
1433 | **/ | |
c53ddacd | 1434 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1435 | { |
1436 | struct symbol *s, *exp; | |
c53ddacd | 1437 | int err = 0; |
1da177e4 LT |
1438 | |
1439 | for (s = mod->unres; s; s = s->next) { | |
1440 | exp = find_symbol(s->name); | |
1441 | if (!exp || exp->module == mod) { | |
c53ddacd | 1442 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1443 | if (warn_unresolved) { |
1444 | warn("\"%s\" [%s.ko] undefined!\n", | |
1445 | s->name, mod->name); | |
1446 | } else { | |
1447 | merror("\"%s\" [%s.ko] undefined!\n", | |
1448 | s->name, mod->name); | |
1449 | err = 1; | |
1450 | } | |
c53ddacd | 1451 | } |
1da177e4 LT |
1452 | continue; |
1453 | } | |
1454 | s->module = exp->module; | |
1455 | s->crc_valid = exp->crc_valid; | |
1456 | s->crc = exp->crc; | |
1457 | } | |
1458 | ||
1459 | if (!modversions) | |
c53ddacd | 1460 | return err; |
1da177e4 LT |
1461 | |
1462 | buf_printf(b, "\n"); | |
1463 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1464 | buf_printf(b, "__attribute_used__\n"); | |
1465 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1466 | ||
1467 | for (s = mod->unres; s; s = s->next) { | |
1468 | if (!s->module) { | |
1469 | continue; | |
1470 | } | |
1471 | if (!s->crc_valid) { | |
cb80514d | 1472 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1473 | s->name, mod->name); |
1474 | continue; | |
1475 | } | |
1476 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1477 | } | |
1478 | ||
1479 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1480 | |
1481 | return err; | |
1da177e4 LT |
1482 | } |
1483 | ||
5c3ead8c SR |
1484 | static void add_depends(struct buffer *b, struct module *mod, |
1485 | struct module *modules) | |
1da177e4 LT |
1486 | { |
1487 | struct symbol *s; | |
1488 | struct module *m; | |
1489 | int first = 1; | |
1490 | ||
1491 | for (m = modules; m; m = m->next) { | |
1492 | m->seen = is_vmlinux(m->name); | |
1493 | } | |
1494 | ||
1495 | buf_printf(b, "\n"); | |
1496 | buf_printf(b, "static const char __module_depends[]\n"); | |
1497 | buf_printf(b, "__attribute_used__\n"); | |
1498 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1499 | buf_printf(b, "\"depends="); | |
1500 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1501 | const char *p; |
1da177e4 LT |
1502 | if (!s->module) |
1503 | continue; | |
1504 | ||
1505 | if (s->module->seen) | |
1506 | continue; | |
1507 | ||
1508 | s->module->seen = 1; | |
a61b2dfd SR |
1509 | if ((p = strrchr(s->module->name, '/')) != NULL) |
1510 | p++; | |
1511 | else | |
1512 | p = s->module->name; | |
1513 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1514 | first = 0; |
1515 | } | |
1516 | buf_printf(b, "\";\n"); | |
1517 | } | |
1518 | ||
5c3ead8c | 1519 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1520 | { |
1521 | if (mod->srcversion[0]) { | |
1522 | buf_printf(b, "\n"); | |
1523 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1524 | mod->srcversion); | |
1525 | } | |
1526 | } | |
1527 | ||
5c3ead8c | 1528 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1529 | { |
1530 | char *tmp; | |
1531 | FILE *file; | |
1532 | struct stat st; | |
1533 | ||
1534 | file = fopen(fname, "r"); | |
1535 | if (!file) | |
1536 | goto write; | |
1537 | ||
1538 | if (fstat(fileno(file), &st) < 0) | |
1539 | goto close_write; | |
1540 | ||
1541 | if (st.st_size != b->pos) | |
1542 | goto close_write; | |
1543 | ||
1544 | tmp = NOFAIL(malloc(b->pos)); | |
1545 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1546 | goto free_write; | |
1547 | ||
1548 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1549 | goto free_write; | |
1550 | ||
1551 | free(tmp); | |
1552 | fclose(file); | |
1553 | return; | |
1554 | ||
1555 | free_write: | |
1556 | free(tmp); | |
1557 | close_write: | |
1558 | fclose(file); | |
1559 | write: | |
1560 | file = fopen(fname, "w"); | |
1561 | if (!file) { | |
1562 | perror(fname); | |
1563 | exit(1); | |
1564 | } | |
1565 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1566 | perror(fname); | |
1567 | exit(1); | |
1568 | } | |
1569 | fclose(file); | |
1570 | } | |
1571 | ||
bd5cbced | 1572 | /* parse Module.symvers file. line format: |
534b89a9 | 1573 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1574 | **/ |
040fcc81 | 1575 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1576 | { |
1577 | unsigned long size, pos = 0; | |
1578 | void *file = grab_file(fname, &size); | |
1579 | char *line; | |
1580 | ||
1581 | if (!file) | |
1582 | /* No symbol versions, silently ignore */ | |
1583 | return; | |
1584 | ||
1585 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1586 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1587 | unsigned int crc; |
1588 | struct module *mod; | |
040fcc81 | 1589 | struct symbol *s; |
1da177e4 LT |
1590 | |
1591 | if (!(symname = strchr(line, '\t'))) | |
1592 | goto fail; | |
1593 | *symname++ = '\0'; | |
1594 | if (!(modname = strchr(symname, '\t'))) | |
1595 | goto fail; | |
1596 | *modname++ = '\0'; | |
9ac545b0 | 1597 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1598 | *export++ = '\0'; |
534b89a9 SR |
1599 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1600 | *end = '\0'; | |
1da177e4 LT |
1601 | crc = strtoul(line, &d, 16); |
1602 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1603 | goto fail; | |
1604 | ||
1605 | if (!(mod = find_module(modname))) { | |
1606 | if (is_vmlinux(modname)) { | |
1607 | have_vmlinux = 1; | |
1608 | } | |
1609 | mod = new_module(NOFAIL(strdup(modname))); | |
1610 | mod->skip = 1; | |
1611 | } | |
bd5cbced | 1612 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1613 | s->kernel = kernel; |
1614 | s->preloaded = 1; | |
bd5cbced | 1615 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1616 | } |
1617 | return; | |
1618 | fail: | |
1619 | fatal("parse error in symbol dump file\n"); | |
1620 | } | |
1621 | ||
040fcc81 SR |
1622 | /* For normal builds always dump all symbols. |
1623 | * For external modules only dump symbols | |
1624 | * that are not read from kernel Module.symvers. | |
1625 | **/ | |
1626 | static int dump_sym(struct symbol *sym) | |
1627 | { | |
1628 | if (!external_module) | |
1629 | return 1; | |
1630 | if (sym->vmlinux || sym->kernel) | |
1631 | return 0; | |
1632 | return 1; | |
1633 | } | |
62070fa4 | 1634 | |
5c3ead8c | 1635 | static void write_dump(const char *fname) |
1da177e4 LT |
1636 | { |
1637 | struct buffer buf = { }; | |
1638 | struct symbol *symbol; | |
1639 | int n; | |
1640 | ||
1641 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1642 | symbol = symbolhash[n]; | |
1643 | while (symbol) { | |
040fcc81 | 1644 | if (dump_sym(symbol)) |
bd5cbced | 1645 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1646 | symbol->crc, symbol->name, |
bd5cbced RP |
1647 | symbol->module->name, |
1648 | export_str(symbol->export)); | |
1da177e4 LT |
1649 | symbol = symbol->next; |
1650 | } | |
1651 | } | |
1652 | write_if_changed(&buf, fname); | |
1653 | } | |
1654 | ||
5c3ead8c | 1655 | int main(int argc, char **argv) |
1da177e4 LT |
1656 | { |
1657 | struct module *mod; | |
1658 | struct buffer buf = { }; | |
040fcc81 SR |
1659 | char *kernel_read = NULL, *module_read = NULL; |
1660 | char *dump_write = NULL; | |
1da177e4 | 1661 | int opt; |
c53ddacd | 1662 | int err; |
1da177e4 | 1663 | |
8d8d8289 | 1664 | while ((opt = getopt(argc, argv, "i:I:mso:aw")) != -1) { |
1da177e4 LT |
1665 | switch(opt) { |
1666 | case 'i': | |
040fcc81 SR |
1667 | kernel_read = optarg; |
1668 | break; | |
1669 | case 'I': | |
1670 | module_read = optarg; | |
1671 | external_module = 1; | |
1da177e4 LT |
1672 | break; |
1673 | case 'm': | |
1674 | modversions = 1; | |
1675 | break; | |
1676 | case 'o': | |
1677 | dump_write = optarg; | |
1678 | break; | |
1679 | case 'a': | |
1680 | all_versions = 1; | |
1681 | break; | |
8d8d8289 SR |
1682 | case 's': |
1683 | vmlinux_section_warnings = 0; | |
1684 | break; | |
c53ddacd KK |
1685 | case 'w': |
1686 | warn_unresolved = 1; | |
1687 | break; | |
1da177e4 LT |
1688 | default: |
1689 | exit(1); | |
1690 | } | |
1691 | } | |
1692 | ||
040fcc81 SR |
1693 | if (kernel_read) |
1694 | read_dump(kernel_read, 1); | |
1695 | if (module_read) | |
1696 | read_dump(module_read, 0); | |
1da177e4 LT |
1697 | |
1698 | while (optind < argc) { | |
1699 | read_symbols(argv[optind++]); | |
1700 | } | |
1701 | ||
b817f6fe SR |
1702 | for (mod = modules; mod; mod = mod->next) { |
1703 | if (mod->skip) | |
1704 | continue; | |
c96fca21 | 1705 | check_exports(mod); |
b817f6fe SR |
1706 | } |
1707 | ||
c53ddacd KK |
1708 | err = 0; |
1709 | ||
1da177e4 | 1710 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
1711 | char fname[strlen(mod->name) + 10]; |
1712 | ||
1da177e4 LT |
1713 | if (mod->skip) |
1714 | continue; | |
1715 | ||
1716 | buf.pos = 0; | |
1717 | ||
1718 | add_header(&buf, mod); | |
c53ddacd | 1719 | err |= add_versions(&buf, mod); |
1da177e4 LT |
1720 | add_depends(&buf, mod, modules); |
1721 | add_moddevtable(&buf, mod); | |
1722 | add_srcversion(&buf, mod); | |
1723 | ||
1724 | sprintf(fname, "%s.mod.c", mod->name); | |
1725 | write_if_changed(&buf, fname); | |
1726 | } | |
1727 | ||
1728 | if (dump_write) | |
1729 | write_dump(dump_write); | |
1730 | ||
c53ddacd | 1731 | return err; |
1da177e4 | 1732 | } |