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