]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
df578e7d | 5 | * Copyright 2006-2008 Sam Ravnborg |
1da177e4 LT |
6 | * Based in part on module-init-tools/depmod.c,file2alias |
7 | * | |
8 | * This software may be used and distributed according to the terms | |
9 | * of the GNU General Public License, incorporated herein by reference. | |
10 | * | |
11 | * Usage: modpost vmlinux module1.o module2.o ... | |
12 | */ | |
13 | ||
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 | ||
df578e7d SR |
77 | myname = strrchr(modname, '/'); |
78 | if (myname) | |
040fcc81 SR |
79 | myname++; |
80 | else | |
81 | myname = modname; | |
82 | ||
741f98fe SR |
83 | return (strcmp(myname, "vmlinux") == 0) || |
84 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
85 | } |
86 | ||
1da177e4 LT |
87 | void *do_nofail(void *ptr, const char *expr) |
88 | { | |
df578e7d | 89 | if (!ptr) |
1da177e4 | 90 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 91 | |
1da177e4 LT |
92 | return ptr; |
93 | } | |
94 | ||
95 | /* A list of all modules we processed */ | |
1da177e4 LT |
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 */ | |
df578e7d SR |
118 | s = strrchr(p, '.'); |
119 | if (s != NULL) | |
1da177e4 LT |
120 | if (strcmp(s, ".o") == 0) |
121 | *s = '\0'; | |
122 | ||
123 | /* add to list */ | |
124 | mod->name = p; | |
b817f6fe | 125 | mod->gpl_compatible = -1; |
1da177e4 LT |
126 | mod->next = modules; |
127 | modules = mod; | |
128 | ||
129 | return mod; | |
130 | } | |
131 | ||
132 | /* A hash of all exported symbols, | |
133 | * struct symbol is also used for lists of unresolved symbols */ | |
134 | ||
135 | #define SYMBOL_HASH_SIZE 1024 | |
136 | ||
137 | struct symbol { | |
138 | struct symbol *next; | |
139 | struct module *module; | |
140 | unsigned int crc; | |
141 | int crc_valid; | |
142 | unsigned int weak:1; | |
040fcc81 SR |
143 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
144 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
145 | * (only for external modules) **/ | |
8e70c458 | 146 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 147 | enum export export; /* Type of export */ |
1da177e4 LT |
148 | char name[0]; |
149 | }; | |
150 | ||
151 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
152 | ||
153 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
154 | static inline unsigned int tdb_hash(const char *name) | |
155 | { | |
156 | unsigned value; /* Used to compute the hash value. */ | |
157 | unsigned i; /* Used to cycle through random values. */ | |
158 | ||
159 | /* Set the initial value from the key size. */ | |
df578e7d | 160 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
161 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
162 | ||
163 | return (1103515243 * value + 12345); | |
164 | } | |
165 | ||
5c3ead8c SR |
166 | /** |
167 | * Allocate a new symbols for use in the hash of exported symbols or | |
168 | * the list of unresolved symbols per module | |
169 | **/ | |
170 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
171 | struct symbol *next) | |
1da177e4 LT |
172 | { |
173 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
174 | ||
175 | memset(s, 0, sizeof(*s)); | |
176 | strcpy(s->name, name); | |
177 | s->weak = weak; | |
178 | s->next = next; | |
179 | return s; | |
180 | } | |
181 | ||
182 | /* For the hash of exported symbols */ | |
bd5cbced RP |
183 | static struct symbol *new_symbol(const char *name, struct module *module, |
184 | enum export export) | |
1da177e4 LT |
185 | { |
186 | unsigned int hash; | |
187 | struct symbol *new; | |
188 | ||
189 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
190 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
191 | new->module = module; | |
bd5cbced | 192 | new->export = export; |
040fcc81 | 193 | return new; |
1da177e4 LT |
194 | } |
195 | ||
5c3ead8c | 196 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
197 | { |
198 | struct symbol *s; | |
199 | ||
200 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
201 | if (name[0] == '.') | |
202 | name++; | |
203 | ||
df578e7d | 204 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
205 | if (strcmp(s->name, name) == 0) |
206 | return s; | |
207 | } | |
208 | return NULL; | |
209 | } | |
210 | ||
bd5cbced RP |
211 | static struct { |
212 | const char *str; | |
213 | enum export export; | |
214 | } export_list[] = { | |
215 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 216 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 217 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 218 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
219 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
220 | { .str = "(unknown)", .export = export_unknown }, | |
221 | }; | |
222 | ||
223 | ||
224 | static const char *export_str(enum export ex) | |
225 | { | |
226 | return export_list[ex].str; | |
227 | } | |
228 | ||
df578e7d | 229 | static enum export export_no(const char *s) |
bd5cbced RP |
230 | { |
231 | int i; | |
df578e7d | 232 | |
534b89a9 SR |
233 | if (!s) |
234 | return export_unknown; | |
bd5cbced RP |
235 | for (i = 0; export_list[i].export != export_unknown; i++) { |
236 | if (strcmp(export_list[i].str, s) == 0) | |
237 | return export_list[i].export; | |
238 | } | |
239 | return export_unknown; | |
240 | } | |
241 | ||
242 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
243 | { | |
244 | if (sec == elf->export_sec) | |
245 | return export_plain; | |
c96fca21 SR |
246 | else if (sec == elf->export_unused_sec) |
247 | return export_unused; | |
bd5cbced RP |
248 | else if (sec == elf->export_gpl_sec) |
249 | return export_gpl; | |
c96fca21 SR |
250 | else if (sec == elf->export_unused_gpl_sec) |
251 | return export_unused_gpl; | |
bd5cbced RP |
252 | else if (sec == elf->export_gpl_future_sec) |
253 | return export_gpl_future; | |
254 | else | |
255 | return export_unknown; | |
256 | } | |
257 | ||
5c3ead8c SR |
258 | /** |
259 | * Add an exported symbol - it may have already been added without a | |
260 | * CRC, in this case just update the CRC | |
261 | **/ | |
bd5cbced RP |
262 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
263 | enum export export) | |
1da177e4 LT |
264 | { |
265 | struct symbol *s = find_symbol(name); | |
266 | ||
267 | if (!s) { | |
bd5cbced | 268 | s = new_symbol(name, mod, export); |
8e70c458 SR |
269 | } else { |
270 | if (!s->preloaded) { | |
7b75b13c | 271 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
272 | "was in %s%s\n", mod->name, name, |
273 | s->module->name, | |
274 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
275 | } else { |
276 | /* In case Modules.symvers was out of date */ | |
277 | s->module = mod; | |
8e70c458 | 278 | } |
1da177e4 | 279 | } |
8e70c458 | 280 | s->preloaded = 0; |
040fcc81 SR |
281 | s->vmlinux = is_vmlinux(mod->name); |
282 | s->kernel = 0; | |
bd5cbced | 283 | s->export = export; |
040fcc81 SR |
284 | return s; |
285 | } | |
286 | ||
287 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 288 | unsigned int crc, enum export export) |
040fcc81 SR |
289 | { |
290 | struct symbol *s = find_symbol(name); | |
291 | ||
292 | if (!s) | |
bd5cbced | 293 | s = new_symbol(name, mod, export); |
040fcc81 SR |
294 | s->crc = crc; |
295 | s->crc_valid = 1; | |
1da177e4 LT |
296 | } |
297 | ||
5c3ead8c | 298 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
299 | { |
300 | struct stat st; | |
301 | void *map; | |
302 | int fd; | |
303 | ||
304 | fd = open(filename, O_RDONLY); | |
305 | if (fd < 0 || fstat(fd, &st) != 0) | |
306 | return NULL; | |
307 | ||
308 | *size = st.st_size; | |
309 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
310 | close(fd); | |
311 | ||
312 | if (map == MAP_FAILED) | |
313 | return NULL; | |
314 | return map; | |
315 | } | |
316 | ||
5c3ead8c SR |
317 | /** |
318 | * Return a copy of the next line in a mmap'ed file. | |
319 | * spaces in the beginning of the line is trimmed away. | |
320 | * Return a pointer to a static buffer. | |
321 | **/ | |
df578e7d | 322 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
323 | { |
324 | static char line[4096]; | |
325 | int skip = 1; | |
326 | size_t len = 0; | |
327 | signed char *p = (signed char *)file + *pos; | |
328 | char *s = line; | |
329 | ||
df578e7d | 330 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
331 | if (skip && isspace(*p)) { |
332 | p++; | |
333 | continue; | |
334 | } | |
335 | skip = 0; | |
336 | if (*p != '\n' && (*pos < size)) { | |
337 | len++; | |
338 | *s++ = *p++; | |
339 | if (len > 4095) | |
340 | break; /* Too long, stop */ | |
341 | } else { | |
342 | /* End of string */ | |
343 | *s = '\0'; | |
344 | return line; | |
345 | } | |
346 | } | |
347 | /* End of buffer */ | |
348 | return NULL; | |
349 | } | |
350 | ||
5c3ead8c | 351 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
352 | { |
353 | munmap(file, size); | |
354 | } | |
355 | ||
85bd2fdd | 356 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
357 | { |
358 | unsigned int i; | |
85bd2fdd | 359 | Elf_Ehdr *hdr; |
1da177e4 LT |
360 | Elf_Shdr *sechdrs; |
361 | Elf_Sym *sym; | |
362 | ||
363 | hdr = grab_file(filename, &info->size); | |
364 | if (!hdr) { | |
365 | perror(filename); | |
6803dc0e | 366 | exit(1); |
1da177e4 LT |
367 | } |
368 | info->hdr = hdr; | |
85bd2fdd SR |
369 | if (info->size < sizeof(*hdr)) { |
370 | /* file too small, assume this is an empty .o file */ | |
371 | return 0; | |
372 | } | |
373 | /* Is this a valid ELF file? */ | |
374 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
375 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
376 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
377 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
378 | /* Not an ELF file - silently ignore it */ | |
379 | return 0; | |
380 | } | |
1da177e4 LT |
381 | /* Fix endianness in ELF header */ |
382 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
383 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
384 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
385 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
ae4ac123 | 386 | hdr->e_type = TO_NATIVE(hdr->e_type); |
1da177e4 LT |
387 | sechdrs = (void *)hdr + hdr->e_shoff; |
388 | info->sechdrs = sechdrs; | |
389 | ||
a83710e5 PS |
390 | /* Check if file offset is correct */ |
391 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
392 | fatal("section header offset=%lu in file '%s' is bigger than " |
393 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
394 | filename, info->size); | |
a83710e5 PS |
395 | return 0; |
396 | } | |
397 | ||
1da177e4 LT |
398 | /* Fix endianness in section headers */ |
399 | for (i = 0; i < hdr->e_shnum; i++) { | |
400 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
401 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
402 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
403 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
404 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
ae4ac123 AN |
405 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); |
406 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
1da177e4 LT |
407 | } |
408 | /* Find symbol table. */ | |
409 | for (i = 1; i < hdr->e_shnum; i++) { | |
410 | const char *secstrings | |
411 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 412 | const char *secname; |
1da177e4 | 413 | |
85bd2fdd | 414 | if (sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
415 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
416 | "sizeof(*hrd)=%zu\n", filename, | |
417 | (unsigned long)sechdrs[i].sh_offset, | |
418 | sizeof(*hdr)); | |
85bd2fdd SR |
419 | return 0; |
420 | } | |
bd5cbced RP |
421 | secname = secstrings + sechdrs[i].sh_name; |
422 | if (strcmp(secname, ".modinfo") == 0) { | |
1da177e4 LT |
423 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
424 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
425 | } else if (strcmp(secname, "__ksymtab") == 0) |
426 | info->export_sec = i; | |
c96fca21 SR |
427 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
428 | info->export_unused_sec = i; | |
bd5cbced RP |
429 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
430 | info->export_gpl_sec = i; | |
c96fca21 SR |
431 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
432 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
433 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
434 | info->export_gpl_future_sec = i; | |
435 | ||
1da177e4 LT |
436 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
437 | continue; | |
438 | ||
439 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 440 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 441 | + sechdrs[i].sh_size; |
62070fa4 | 442 | info->strtab = (void *)hdr + |
1da177e4 LT |
443 | sechdrs[sechdrs[i].sh_link].sh_offset; |
444 | } | |
df578e7d | 445 | if (!info->symtab_start) |
cb80514d | 446 | fatal("%s has no symtab?\n", filename); |
df578e7d | 447 | |
1da177e4 LT |
448 | /* Fix endianness in symbols */ |
449 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
450 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
451 | sym->st_name = TO_NATIVE(sym->st_name); | |
452 | sym->st_value = TO_NATIVE(sym->st_value); | |
453 | sym->st_size = TO_NATIVE(sym->st_size); | |
454 | } | |
85bd2fdd | 455 | return 1; |
1da177e4 LT |
456 | } |
457 | ||
5c3ead8c | 458 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
459 | { |
460 | release_file(info->hdr, info->size); | |
461 | } | |
462 | ||
f7b05e64 LY |
463 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
464 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 465 | |
5c3ead8c SR |
466 | static void handle_modversions(struct module *mod, struct elf_info *info, |
467 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
468 | { |
469 | unsigned int crc; | |
bd5cbced | 470 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
471 | |
472 | switch (sym->st_shndx) { | |
473 | case SHN_COMMON: | |
cb80514d | 474 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
475 | break; |
476 | case SHN_ABS: | |
477 | /* CRC'd symbol */ | |
478 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
479 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
480 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
481 | export); | |
1da177e4 LT |
482 | } |
483 | break; | |
484 | case SHN_UNDEF: | |
485 | /* undefined symbol */ | |
486 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
487 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
488 | break; | |
489 | /* ignore global offset table */ | |
490 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
491 | break; | |
492 | /* ignore __this_module, it will be resolved shortly */ | |
493 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
494 | break; | |
8d529014 BC |
495 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
496 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
497 | /* add compatibility with older glibc */ | |
498 | #ifndef STT_SPARC_REGISTER | |
499 | #define STT_SPARC_REGISTER STT_REGISTER | |
500 | #endif | |
1da177e4 LT |
501 | if (info->hdr->e_machine == EM_SPARC || |
502 | info->hdr->e_machine == EM_SPARCV9) { | |
503 | /* Ignore register directives. */ | |
8d529014 | 504 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 505 | break; |
62070fa4 SR |
506 | if (symname[0] == '.') { |
507 | char *munged = strdup(symname); | |
508 | munged[0] = '_'; | |
509 | munged[1] = toupper(munged[1]); | |
510 | symname = munged; | |
511 | } | |
1da177e4 LT |
512 | } |
513 | #endif | |
62070fa4 | 514 | |
1da177e4 | 515 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
516 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
517 | mod->unres = | |
518 | alloc_symbol(symname + | |
519 | strlen(MODULE_SYMBOL_PREFIX), | |
520 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
521 | mod->unres); | |
522 | } | |
1da177e4 LT |
523 | break; |
524 | default: | |
525 | /* All exported symbols */ | |
526 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
527 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
528 | export); | |
1da177e4 LT |
529 | } |
530 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
531 | mod->has_init = 1; | |
532 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
533 | mod->has_cleanup = 1; | |
534 | break; | |
535 | } | |
536 | } | |
537 | ||
5c3ead8c SR |
538 | /** |
539 | * Parse tag=value strings from .modinfo section | |
540 | **/ | |
1da177e4 LT |
541 | static char *next_string(char *string, unsigned long *secsize) |
542 | { | |
543 | /* Skip non-zero chars */ | |
544 | while (string[0]) { | |
545 | string++; | |
546 | if ((*secsize)-- <= 1) | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | /* Skip any zero padding. */ | |
551 | while (!string[0]) { | |
552 | string++; | |
553 | if ((*secsize)-- <= 1) | |
554 | return NULL; | |
555 | } | |
556 | return string; | |
557 | } | |
558 | ||
b817f6fe SR |
559 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
560 | const char *tag, char *info) | |
1da177e4 LT |
561 | { |
562 | char *p; | |
563 | unsigned int taglen = strlen(tag); | |
564 | unsigned long size = modinfo_len; | |
565 | ||
b817f6fe SR |
566 | if (info) { |
567 | size -= info - (char *)modinfo; | |
568 | modinfo = next_string(info, &size); | |
569 | } | |
570 | ||
1da177e4 LT |
571 | for (p = modinfo; p; p = next_string(p, &size)) { |
572 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
573 | return p + taglen + 1; | |
574 | } | |
575 | return NULL; | |
576 | } | |
577 | ||
b817f6fe SR |
578 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
579 | const char *tag) | |
580 | ||
581 | { | |
582 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
583 | } | |
584 | ||
4c8fbca5 SR |
585 | /** |
586 | * Test if string s ends in string sub | |
587 | * return 0 if match | |
588 | **/ | |
589 | static int strrcmp(const char *s, const char *sub) | |
590 | { | |
df578e7d | 591 | int slen, sublen; |
62070fa4 | 592 | |
4c8fbca5 SR |
593 | if (!s || !sub) |
594 | return 1; | |
62070fa4 | 595 | |
4c8fbca5 | 596 | slen = strlen(s); |
df578e7d | 597 | sublen = strlen(sub); |
62070fa4 | 598 | |
4c8fbca5 SR |
599 | if ((slen == 0) || (sublen == 0)) |
600 | return 1; | |
601 | ||
df578e7d SR |
602 | if (sublen > slen) |
603 | return 1; | |
4c8fbca5 | 604 | |
df578e7d | 605 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
606 | } |
607 | ||
10668220 SR |
608 | /* if sym is empty or point to a string |
609 | * like ".[0-9]+" then return 1. | |
610 | * This is the optional prefix added by ld to some sections | |
611 | */ | |
612 | static int number_prefix(const char *sym) | |
613 | { | |
614 | if (*sym++ == '\0') | |
615 | return 1; | |
616 | if (*sym != '.') | |
617 | return 0; | |
618 | do { | |
619 | char c = *sym++; | |
620 | if (c < '0' || c > '9') | |
621 | return 0; | |
622 | } while (*sym); | |
623 | return 1; | |
624 | } | |
625 | ||
626 | /* The pattern is an array of simple patterns. | |
627 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 628 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
629 | * "foo*" will match a string that begins with "foo" |
630 | * "foo$" will match a string equal to "foo" or "foo.1" | |
631 | * where the '1' can be any number including several digits. | |
632 | * The $ syntax is for sections where ld append a dot number | |
633 | * to make section name unique. | |
634 | */ | |
635 | int match(const char *sym, const char * const pat[]) | |
636 | { | |
637 | const char *p; | |
638 | while (*pat) { | |
639 | p = *pat++; | |
640 | const char *endp = p + strlen(p) - 1; | |
641 | ||
6c5bd235 SR |
642 | /* "*foo" */ |
643 | if (*p == '*') { | |
644 | if (strrcmp(sym, p + 1) == 0) | |
645 | return 1; | |
646 | } | |
10668220 | 647 | /* "foo*" */ |
6c5bd235 | 648 | else if (*endp == '*') { |
10668220 SR |
649 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
650 | return 1; | |
651 | } | |
652 | /* "foo$" */ | |
653 | else if (*endp == '$') { | |
654 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
655 | if (number_prefix(sym + strlen(p) - 1)) | |
656 | return 1; | |
657 | } | |
658 | } | |
659 | /* no wildcards */ | |
660 | else { | |
661 | if (strcmp(p, sym) == 0) | |
662 | return 1; | |
663 | } | |
664 | } | |
665 | /* no match */ | |
666 | return 0; | |
667 | } | |
668 | ||
10668220 SR |
669 | /* sections that we do not want to do full section mismatch check on */ |
670 | static const char *section_white_list[] = | |
671 | { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL }; | |
672 | ||
eb8f6890 SR |
673 | #define ALL_INIT_DATA_SECTIONS \ |
674 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" | |
675 | #define ALL_EXIT_DATA_SECTIONS \ | |
676 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 677 | |
eb8f6890 SR |
678 | #define ALL_INIT_TEXT_SECTIONS \ |
679 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
680 | #define ALL_EXIT_TEXT_SECTIONS \ | |
681 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 682 | |
eb8f6890 SR |
683 | #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS |
684 | #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS | |
10668220 | 685 | |
6c5bd235 | 686 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
687 | #define TEXT_SECTIONS ".text$" |
688 | ||
eb8f6890 SR |
689 | #define INIT_SECTIONS ".init.data$", ".init.text$" |
690 | #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$" | |
691 | #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$" | |
692 | #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$" | |
693 | ||
694 | #define EXIT_SECTIONS ".exit.data$", ".exit.text$" | |
695 | #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$" | |
696 | #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$" | |
697 | #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$" | |
698 | ||
6c5bd235 | 699 | /* init data sections */ |
eb8f6890 | 700 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
701 | |
702 | /* all init sections */ | |
eb8f6890 | 703 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
704 | |
705 | /* All init and exit sections (code + data) */ | |
706 | static const char *init_exit_sections[] = | |
eb8f6890 | 707 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
708 | |
709 | /* data section */ | |
710 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
711 | ||
712 | /* sections that may refer to an init/exit section with no warning */ | |
713 | static const char *initref_sections[] = | |
714 | { | |
715 | ".text.init.refok*", | |
716 | ".exit.text.refok*", | |
717 | ".data.init.refok*", | |
718 | NULL | |
719 | }; | |
720 | ||
721 | ||
722 | /* symbols in .data that may refer to init/exit sections */ | |
723 | static const char *symbol_white_list[] = | |
724 | { | |
725 | "*driver", | |
726 | "*_template", /* scsi uses *_template a lot */ | |
727 | "*_timer", /* arm uses ops structures named _timer a lot */ | |
728 | "*_sht", /* scsi also used *_sht to some extent */ | |
729 | "*_ops", | |
730 | "*_probe", | |
731 | "*_probe_one", | |
732 | "*_console", | |
733 | NULL | |
734 | }; | |
735 | ||
736 | static const char *head_sections[] = { ".head.text*", NULL }; | |
737 | static const char *linker_symbols[] = | |
738 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
739 | ||
10668220 SR |
740 | struct sectioncheck { |
741 | const char *fromsec[20]; | |
742 | const char *tosec[20]; | |
743 | }; | |
744 | ||
745 | const struct sectioncheck sectioncheck[] = { | |
746 | /* Do not reference init/exit code/data from | |
747 | * normal code and data | |
748 | */ | |
749 | { | |
750 | .fromsec = { TEXT_SECTIONS, DATA_SECTIONS, NULL }, | |
eb8f6890 SR |
751 | .tosec = { ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL } |
752 | }, | |
753 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
754 | { | |
755 | .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL }, | |
756 | .tosec = { INIT_SECTIONS, NULL } | |
757 | }, | |
758 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ | |
759 | { | |
760 | .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL }, | |
761 | .tosec = { EXIT_SECTIONS, NULL } | |
10668220 SR |
762 | }, |
763 | /* Do not use exit code/data from init code */ | |
764 | { | |
eb8f6890 SR |
765 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
766 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
10668220 SR |
767 | }, |
768 | /* Do not use init code/data from exit code */ | |
769 | { | |
eb8f6890 SR |
770 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
771 | .tosec = { ALL_INIT_SECTIONS, NULL } | |
10668220 SR |
772 | }, |
773 | /* Do not export init/exit functions or data */ | |
774 | { | |
775 | .fromsec = { "__ksymtab*", NULL }, | |
eb8f6890 | 776 | .tosec = { ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL } |
10668220 SR |
777 | } |
778 | }; | |
779 | ||
780 | static int section_mismatch(const char *fromsec, const char *tosec) | |
781 | { | |
782 | int i; | |
783 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
784 | const struct sectioncheck *check = §ioncheck[0]; | |
785 | ||
786 | for (i = 0; i < elems; i++) { | |
787 | if (match(fromsec, check->fromsec) && | |
788 | match(tosec, check->tosec)) | |
789 | return 1; | |
790 | check++; | |
791 | } | |
792 | return 0; | |
793 | } | |
794 | ||
795 | ||
4c8fbca5 SR |
796 | /** |
797 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e SR |
798 | * |
799 | * Pattern 0: | |
800 | * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. | |
801 | * The pattern is identified by: | |
cb7e51d8 | 802 | * fromsec = .text.init.refok* | .data.init.refok* |
0e0d314e | 803 | * |
4c8fbca5 SR |
804 | * Pattern 1: |
805 | * If a module parameter is declared __initdata and permissions=0 | |
806 | * then this is legal despite the warning generated. | |
807 | * We cannot see value of permissions here, so just ignore | |
808 | * this pattern. | |
809 | * The pattern is identified by: | |
810 | * tosec = .init.data | |
9209aed0 | 811 | * fromsec = .data* |
4c8fbca5 | 812 | * atsym =__param* |
62070fa4 | 813 | * |
4c8fbca5 | 814 | * Pattern 2: |
72ee59b5 | 815 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
816 | * add, remove, probe functions etc. |
817 | * These functions may often be marked __init and we do not want to | |
818 | * warn here. | |
819 | * the pattern is identified by: | |
83cda2bb SR |
820 | * tosec = init or exit section |
821 | * fromsec = data section | |
df578e7d SR |
822 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
823 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
824 | * |
825 | * Pattern 3: | |
9bf8cb9b SR |
826 | * Whitelist all refereces from .text.head to .init.data |
827 | * Whitelist all refereces from .text.head to .init.text | |
828 | * | |
1d8af559 | 829 | * Pattern 4: |
ee6a8545 VG |
830 | * Some symbols belong to init section but still it is ok to reference |
831 | * these from non-init sections as these symbols don't have any memory | |
832 | * allocated for them and symbol address and value are same. So even | |
833 | * if init section is freed, its ok to reference those symbols. | |
834 | * For ex. symbols marking the init section boundaries. | |
835 | * This pattern is identified by | |
836 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 837 | * |
4c8fbca5 | 838 | **/ |
9e157a5a | 839 | static int secref_whitelist(const char *modname, const char *tosec, |
ee6a8545 VG |
840 | const char *fromsec, const char *atsym, |
841 | const char *refsymname) | |
4c8fbca5 | 842 | { |
0e0d314e | 843 | /* Check for pattern 0 */ |
6c5bd235 | 844 | if (match(fromsec, initref_sections)) |
0e0d314e SR |
845 | return 1; |
846 | ||
4c8fbca5 | 847 | /* Check for pattern 1 */ |
6c5bd235 SR |
848 | if (match(tosec, init_data_sections) && |
849 | match(fromsec, data_sections) && | |
83cda2bb SR |
850 | (strncmp(atsym, "__param", strlen("__param")) == 0)) |
851 | return 1; | |
4c8fbca5 SR |
852 | |
853 | /* Check for pattern 2 */ | |
6c5bd235 SR |
854 | if (match(tosec, init_exit_sections) && |
855 | match(fromsec, data_sections) && | |
856 | match(atsym, symbol_white_list)) | |
857 | return 1; | |
4c8fbca5 | 858 | |
9bf8cb9b | 859 | /* Check for pattern 3 */ |
6c5bd235 SR |
860 | if (match(fromsec, head_sections) && |
861 | match(tosec, init_sections)) | |
9bf8cb9b SR |
862 | return 1; |
863 | ||
1d8af559 | 864 | /* Check for pattern 4 */ |
6c5bd235 SR |
865 | if (match(refsymname, linker_symbols)) |
866 | return 1; | |
9bf8cb9b | 867 | |
93659af1 | 868 | return 0; |
4c8fbca5 SR |
869 | } |
870 | ||
93684d3b SR |
871 | /** |
872 | * Find symbol based on relocation record info. | |
873 | * In some cases the symbol supplied is a valid symbol so | |
874 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
875 | * In other cases the symbol needs to be looked up in the symbol table | |
876 | * based on section and address. | |
877 | * **/ | |
9ad21c3f | 878 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
879 | Elf_Sym *relsym) |
880 | { | |
881 | Elf_Sym *sym; | |
9ad21c3f SR |
882 | Elf_Sym *near = NULL; |
883 | Elf64_Sword distance = 20; | |
884 | Elf64_Sword d; | |
93684d3b SR |
885 | |
886 | if (relsym->st_name != 0) | |
887 | return relsym; | |
888 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
889 | if (sym->st_shndx != relsym->st_shndx) | |
890 | continue; | |
ae4ac123 AN |
891 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
892 | continue; | |
93684d3b SR |
893 | if (sym->st_value == addr) |
894 | return sym; | |
9ad21c3f SR |
895 | /* Find a symbol nearby - addr are maybe negative */ |
896 | d = sym->st_value - addr; | |
897 | if (d < 0) | |
898 | d = addr - sym->st_value; | |
899 | if (d < distance) { | |
900 | distance = d; | |
901 | near = sym; | |
902 | } | |
93684d3b | 903 | } |
9ad21c3f SR |
904 | /* We need a close match */ |
905 | if (distance < 20) | |
906 | return near; | |
907 | else | |
908 | return NULL; | |
93684d3b SR |
909 | } |
910 | ||
da68d61f DB |
911 | static inline int is_arm_mapping_symbol(const char *str) |
912 | { | |
913 | return str[0] == '$' && strchr("atd", str[1]) | |
914 | && (str[2] == '\0' || str[2] == '.'); | |
915 | } | |
916 | ||
917 | /* | |
918 | * If there's no name there, ignore it; likewise, ignore it if it's | |
919 | * one of the magic symbols emitted used by current ARM tools. | |
920 | * | |
921 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
922 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
923 | * only by merging __exit and __init sections into __text, bloating | |
924 | * the kernel (which is especially evil on embedded platforms). | |
925 | */ | |
926 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
927 | { | |
928 | const char *name = elf->strtab + sym->st_name; | |
929 | ||
930 | if (!name || !strlen(name)) | |
931 | return 0; | |
932 | return !is_arm_mapping_symbol(name); | |
933 | } | |
934 | ||
b39927cf | 935 | /* |
43c74d17 SR |
936 | * Find symbols before or equal addr and after addr - in the section sec. |
937 | * If we find two symbols with equal offset prefer one with a valid name. | |
938 | * The ELF format may have a better way to detect what type of symbol | |
939 | * it is, but this works for now. | |
b39927cf SR |
940 | **/ |
941 | static void find_symbols_between(struct elf_info *elf, Elf_Addr addr, | |
942 | const char *sec, | |
df578e7d | 943 | Elf_Sym **before, Elf_Sym **after) |
b39927cf SR |
944 | { |
945 | Elf_Sym *sym; | |
946 | Elf_Ehdr *hdr = elf->hdr; | |
947 | Elf_Addr beforediff = ~0; | |
948 | Elf_Addr afterdiff = ~0; | |
949 | const char *secstrings = (void *)hdr + | |
950 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
62070fa4 | 951 | |
b39927cf SR |
952 | *before = NULL; |
953 | *after = NULL; | |
954 | ||
955 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
956 | const char *symsec; | |
957 | ||
958 | if (sym->st_shndx >= SHN_LORESERVE) | |
959 | continue; | |
960 | symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name; | |
961 | if (strcmp(symsec, sec) != 0) | |
962 | continue; | |
da68d61f DB |
963 | if (!is_valid_name(elf, sym)) |
964 | continue; | |
b39927cf SR |
965 | if (sym->st_value <= addr) { |
966 | if ((addr - sym->st_value) < beforediff) { | |
967 | beforediff = addr - sym->st_value; | |
968 | *before = sym; | |
df578e7d | 969 | } else if ((addr - sym->st_value) == beforediff) { |
da68d61f | 970 | *before = sym; |
43c74d17 | 971 | } |
df578e7d | 972 | } else { |
b39927cf SR |
973 | if ((sym->st_value - addr) < afterdiff) { |
974 | afterdiff = sym->st_value - addr; | |
975 | *after = sym; | |
df578e7d | 976 | } else if ((sym->st_value - addr) == afterdiff) |
da68d61f | 977 | *after = sym; |
b39927cf SR |
978 | } |
979 | } | |
980 | } | |
981 | ||
982 | /** | |
983 | * Print a warning about a section mismatch. | |
984 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 985 | * Check whitelist before warning - it may be a false positive. |
b39927cf SR |
986 | **/ |
987 | static void warn_sec_mismatch(const char *modname, const char *fromsec, | |
988 | struct elf_info *elf, Elf_Sym *sym, Elf_Rela r) | |
989 | { | |
93684d3b SR |
990 | const char *refsymname = ""; |
991 | Elf_Sym *before, *after; | |
992 | Elf_Sym *refsym; | |
b39927cf SR |
993 | Elf_Ehdr *hdr = elf->hdr; |
994 | Elf_Shdr *sechdrs = elf->sechdrs; | |
995 | const char *secstrings = (void *)hdr + | |
996 | sechdrs[hdr->e_shstrndx].sh_offset; | |
997 | const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name; | |
62070fa4 | 998 | |
b39927cf SR |
999 | find_symbols_between(elf, r.r_offset, fromsec, &before, &after); |
1000 | ||
93684d3b SR |
1001 | refsym = find_elf_symbol(elf, r.r_addend, sym); |
1002 | if (refsym && strlen(elf->strtab + refsym->st_name)) | |
1003 | refsymname = elf->strtab + refsym->st_name; | |
4c8fbca5 SR |
1004 | |
1005 | /* check whitelist - we may ignore it */ | |
cb7e51d8 SR |
1006 | if (secref_whitelist(modname, secname, fromsec, |
1007 | before ? elf->strtab + before->st_name : "", | |
1008 | refsymname)) | |
4c8fbca5 | 1009 | return; |
62070fa4 | 1010 | |
b39927cf | 1011 | if (before && after) { |
25601209 RK |
1012 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
1013 | "(between '%s' and '%s')\n", | |
1014 | modname, fromsec, (unsigned long long)r.r_offset, | |
1015 | secname, refsymname, | |
b39927cf | 1016 | elf->strtab + before->st_name, |
b39927cf SR |
1017 | elf->strtab + after->st_name); |
1018 | } else if (before) { | |
25601209 RK |
1019 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
1020 | "(after '%s')\n", | |
1021 | modname, fromsec, (unsigned long long)r.r_offset, | |
1022 | secname, refsymname, | |
1023 | elf->strtab + before->st_name); | |
b39927cf | 1024 | } else if (after) { |
25601209 | 1025 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s " |
93684d3b | 1026 | "before '%s' (at offset -0x%llx)\n", |
25601209 RK |
1027 | modname, fromsec, (unsigned long long)r.r_offset, |
1028 | secname, refsymname, | |
58b7a68d AK |
1029 | elf->strtab + after->st_name, |
1030 | (unsigned long long)r.r_offset); | |
b39927cf | 1031 | } else { |
25601209 RK |
1032 | warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n", |
1033 | modname, fromsec, (unsigned long long)r.r_offset, | |
1034 | secname, refsymname); | |
b39927cf SR |
1035 | } |
1036 | } | |
1037 | ||
ae4ac123 | 1038 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1039 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1040 | { |
1041 | Elf_Shdr *sechdrs = elf->sechdrs; | |
5b24c071 | 1042 | int section = sechdr->sh_info; |
ae4ac123 AN |
1043 | |
1044 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
1045 | (r->r_offset - sechdrs[section].sh_addr); | |
1046 | } | |
1047 | ||
5b24c071 | 1048 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1049 | { |
1050 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1051 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1052 | |
1053 | switch (r_typ) { | |
1054 | case R_386_32: | |
1055 | r->r_addend = TO_NATIVE(*location); | |
1056 | break; | |
1057 | case R_386_PC32: | |
1058 | r->r_addend = TO_NATIVE(*location) + 4; | |
1059 | /* For CONFIG_RELOCATABLE=y */ | |
1060 | if (elf->hdr->e_type == ET_EXEC) | |
1061 | r->r_addend += r->r_offset; | |
1062 | break; | |
1063 | } | |
1064 | return 0; | |
1065 | } | |
1066 | ||
5b24c071 | 1067 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1068 | { |
1069 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1070 | ||
1071 | switch (r_typ) { | |
1072 | case R_ARM_ABS32: | |
1073 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1074 | r->r_addend = (int)(long) |
1075 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1076 | break; |
1077 | case R_ARM_PC24: | |
1078 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1079 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1080 | sechdr->sh_offset + |
1081 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1082 | break; |
1083 | default: | |
1084 | return 1; | |
1085 | } | |
1086 | return 0; | |
1087 | } | |
1088 | ||
5b24c071 | 1089 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1090 | { |
1091 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1092 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1093 | unsigned int inst; |
1094 | ||
1095 | if (r_typ == R_MIPS_HI16) | |
1096 | return 1; /* skip this */ | |
1097 | inst = TO_NATIVE(*location); | |
1098 | switch (r_typ) { | |
1099 | case R_MIPS_LO16: | |
1100 | r->r_addend = inst & 0xffff; | |
1101 | break; | |
1102 | case R_MIPS_26: | |
1103 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1104 | break; | |
1105 | case R_MIPS_32: | |
1106 | r->r_addend = inst; | |
1107 | break; | |
1108 | } | |
1109 | return 0; | |
1110 | } | |
1111 | ||
5b24c071 | 1112 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1113 | Elf_Shdr *sechdr) |
5b24c071 SR |
1114 | { |
1115 | Elf_Sym *sym; | |
1116 | Elf_Rela *rela; | |
1117 | Elf_Rela r; | |
1118 | unsigned int r_sym; | |
1119 | const char *fromsec; | |
1120 | const char * tosec; | |
1121 | ||
1122 | Elf_Ehdr *hdr = elf->hdr; | |
1123 | Elf_Rela *start = (void *)hdr + sechdr->sh_offset; | |
1124 | Elf_Rela *stop = (void *)start + sechdr->sh_size; | |
1125 | ||
1126 | const char *secstrings = (void *)hdr + | |
1127 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
1128 | ||
1129 | fromsec = secstrings + sechdr->sh_name; | |
1130 | fromsec += strlen(".rela"); | |
1131 | /* if from section (name) is know good then skip it */ | |
10668220 | 1132 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1133 | return; |
1134 | ||
1135 | for (rela = start; rela < stop; rela++) { | |
1136 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1137 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
1138 | if (hdr->e_machine == EM_MIPS) { | |
1139 | unsigned int r_typ; | |
1140 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1141 | r_sym = TO_NATIVE(r_sym); | |
1142 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1143 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1144 | } else { | |
1145 | r.r_info = TO_NATIVE(rela->r_info); | |
1146 | r_sym = ELF_R_SYM(r.r_info); | |
1147 | } | |
1148 | #else | |
1149 | r.r_info = TO_NATIVE(rela->r_info); | |
1150 | r_sym = ELF_R_SYM(r.r_info); | |
1151 | #endif | |
1152 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1153 | sym = elf->symtab_start + r_sym; | |
1154 | /* Skip special sections */ | |
1155 | if (sym->st_shndx >= SHN_LORESERVE) | |
1156 | continue; | |
1157 | ||
1158 | tosec = secstrings + | |
1159 | elf->sechdrs[sym->st_shndx].sh_name; | |
10668220 | 1160 | if (section_mismatch(fromsec, tosec)) |
5b24c071 SR |
1161 | warn_sec_mismatch(modname, fromsec, elf, sym, r); |
1162 | } | |
1163 | } | |
1164 | ||
1165 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1166 | Elf_Shdr *sechdr) |
5b24c071 SR |
1167 | { |
1168 | Elf_Sym *sym; | |
1169 | Elf_Rel *rel; | |
1170 | Elf_Rela r; | |
1171 | unsigned int r_sym; | |
1172 | const char *fromsec; | |
1173 | const char * tosec; | |
1174 | ||
1175 | Elf_Ehdr *hdr = elf->hdr; | |
1176 | Elf_Rel *start = (void *)hdr + sechdr->sh_offset; | |
1177 | Elf_Rel *stop = (void *)start + sechdr->sh_size; | |
1178 | ||
1179 | const char *secstrings = (void *)hdr + | |
1180 | elf->sechdrs[hdr->e_shstrndx].sh_offset; | |
1181 | ||
1182 | fromsec = secstrings + sechdr->sh_name; | |
1183 | fromsec += strlen(".rel"); | |
1184 | /* if from section (name) is know good then skip it */ | |
10668220 | 1185 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1186 | return; |
1187 | ||
1188 | for (rel = start; rel < stop; rel++) { | |
1189 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1190 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
1191 | if (hdr->e_machine == EM_MIPS) { | |
1192 | unsigned int r_typ; | |
1193 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1194 | r_sym = TO_NATIVE(r_sym); | |
1195 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1196 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1197 | } else { | |
1198 | r.r_info = TO_NATIVE(rel->r_info); | |
1199 | r_sym = ELF_R_SYM(r.r_info); | |
1200 | } | |
1201 | #else | |
1202 | r.r_info = TO_NATIVE(rel->r_info); | |
1203 | r_sym = ELF_R_SYM(r.r_info); | |
1204 | #endif | |
1205 | r.r_addend = 0; | |
1206 | switch (hdr->e_machine) { | |
1207 | case EM_386: | |
1208 | if (addend_386_rel(elf, sechdr, &r)) | |
1209 | continue; | |
1210 | break; | |
1211 | case EM_ARM: | |
1212 | if (addend_arm_rel(elf, sechdr, &r)) | |
1213 | continue; | |
1214 | break; | |
1215 | case EM_MIPS: | |
1216 | if (addend_mips_rel(elf, sechdr, &r)) | |
1217 | continue; | |
1218 | break; | |
1219 | } | |
1220 | sym = elf->symtab_start + r_sym; | |
1221 | /* Skip special sections */ | |
1222 | if (sym->st_shndx >= SHN_LORESERVE) | |
1223 | continue; | |
1224 | ||
1225 | tosec = secstrings + | |
1226 | elf->sechdrs[sym->st_shndx].sh_name; | |
10668220 | 1227 | if (section_mismatch(fromsec, tosec)) |
5b24c071 SR |
1228 | warn_sec_mismatch(modname, fromsec, elf, sym, r); |
1229 | } | |
1230 | } | |
1231 | ||
b39927cf SR |
1232 | /** |
1233 | * A module includes a number of sections that are discarded | |
1234 | * either when loaded or when used as built-in. | |
1235 | * For loaded modules all functions marked __init and all data | |
1236 | * marked __initdata will be discarded when the module has been intialized. | |
1237 | * Likewise for modules used built-in the sections marked __exit | |
1238 | * are discarded because __exit marked function are supposed to be called | |
1239 | * only when a moduel is unloaded which never happes for built-in modules. | |
1240 | * The check_sec_ref() function traverses all relocation records | |
1241 | * to find all references to a section that reference a section that will | |
1242 | * be discarded and warns about it. | |
1243 | **/ | |
1244 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1245 | struct elf_info *elf) |
b39927cf SR |
1246 | { |
1247 | int i; | |
b39927cf SR |
1248 | Elf_Ehdr *hdr = elf->hdr; |
1249 | Elf_Shdr *sechdrs = elf->sechdrs; | |
62070fa4 | 1250 | |
b39927cf SR |
1251 | /* Walk through all sections */ |
1252 | for (i = 0; i < hdr->e_shnum; i++) { | |
b39927cf | 1253 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1254 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1255 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1256 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1257 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1258 | } |
1259 | } | |
1260 | ||
5c3ead8c | 1261 | static void read_symbols(char *modname) |
1da177e4 LT |
1262 | { |
1263 | const char *symname; | |
1264 | char *version; | |
b817f6fe | 1265 | char *license; |
1da177e4 LT |
1266 | struct module *mod; |
1267 | struct elf_info info = { }; | |
1268 | Elf_Sym *sym; | |
1269 | ||
85bd2fdd SR |
1270 | if (!parse_elf(&info, modname)) |
1271 | return; | |
1da177e4 LT |
1272 | |
1273 | mod = new_module(modname); | |
1274 | ||
1275 | /* When there's no vmlinux, don't print warnings about | |
1276 | * unresolved symbols (since there'll be too many ;) */ | |
1277 | if (is_vmlinux(modname)) { | |
1da177e4 | 1278 | have_vmlinux = 1; |
1da177e4 LT |
1279 | mod->skip = 1; |
1280 | } | |
1281 | ||
b817f6fe SR |
1282 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
1283 | while (license) { | |
1284 | if (license_is_gpl_compatible(license)) | |
1285 | mod->gpl_compatible = 1; | |
1286 | else { | |
1287 | mod->gpl_compatible = 0; | |
1288 | break; | |
1289 | } | |
1290 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1291 | "license", license); | |
1292 | } | |
1293 | ||
1da177e4 LT |
1294 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1295 | symname = info.strtab + sym->st_name; | |
1296 | ||
1297 | handle_modversions(mod, &info, sym, symname); | |
1298 | handle_moddevtable(mod, &info, sym, symname); | |
1299 | } | |
d1f25e66 | 1300 | if (!is_vmlinux(modname) || |
10668220 SR |
1301 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1302 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1303 | |
1304 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1305 | if (version) | |
1306 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1307 | version - (char *)info.hdr); | |
1308 | if (version || (all_versions && !is_vmlinux(modname))) | |
1309 | get_src_version(modname, mod->srcversion, | |
1310 | sizeof(mod->srcversion)-1); | |
1311 | ||
1312 | parse_elf_finish(&info); | |
1313 | ||
1314 | /* Our trick to get versioning for struct_module - it's | |
1315 | * never passed as an argument to an exported function, so | |
1316 | * the automatic versioning doesn't pick it up, but it's really | |
1317 | * important anyhow */ | |
1318 | if (modversions) | |
1319 | mod->unres = alloc_symbol("struct_module", 0, mod->unres); | |
1320 | } | |
1321 | ||
1322 | #define SZ 500 | |
1323 | ||
1324 | /* We first write the generated file into memory using the | |
1325 | * following helper, then compare to the file on disk and | |
1326 | * only update the later if anything changed */ | |
1327 | ||
5c3ead8c SR |
1328 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1329 | const char *fmt, ...) | |
1da177e4 LT |
1330 | { |
1331 | char tmp[SZ]; | |
1332 | int len; | |
1333 | va_list ap; | |
62070fa4 | 1334 | |
1da177e4 LT |
1335 | va_start(ap, fmt); |
1336 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1337 | buf_write(buf, tmp, len); |
1da177e4 LT |
1338 | va_end(ap); |
1339 | } | |
1340 | ||
5c3ead8c | 1341 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1342 | { |
1343 | if (buf->size - buf->pos < len) { | |
7670f023 | 1344 | buf->size += len + SZ; |
1da177e4 LT |
1345 | buf->p = realloc(buf->p, buf->size); |
1346 | } | |
1347 | strncpy(buf->p + buf->pos, s, len); | |
1348 | buf->pos += len; | |
1349 | } | |
1350 | ||
c96fca21 SR |
1351 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1352 | { | |
1353 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1354 | ||
1355 | switch (exp) { | |
1356 | case export_gpl: | |
1357 | fatal("modpost: GPL-incompatible module %s%s " | |
1358 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1359 | break; | |
1360 | case export_unused_gpl: | |
1361 | fatal("modpost: GPL-incompatible module %s%s " | |
1362 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1363 | break; | |
1364 | case export_gpl_future: | |
1365 | warn("modpost: GPL-incompatible module %s%s " | |
1366 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1367 | break; | |
1368 | case export_plain: | |
1369 | case export_unused: | |
1370 | case export_unknown: | |
1371 | /* ignore */ | |
1372 | break; | |
1373 | } | |
1374 | } | |
1375 | ||
df578e7d | 1376 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1377 | { |
1378 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1379 | ||
1380 | switch (exp) { | |
1381 | case export_unused: | |
1382 | case export_unused_gpl: | |
1383 | warn("modpost: module %s%s " | |
1384 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1385 | break; | |
1386 | default: | |
1387 | /* ignore */ | |
1388 | break; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1393 | { |
1394 | struct symbol *s, *exp; | |
1395 | ||
1396 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1397 | const char *basename; |
b817f6fe SR |
1398 | exp = find_symbol(s->name); |
1399 | if (!exp || exp->module == mod) | |
1400 | continue; | |
6449bd62 | 1401 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1402 | if (basename) |
1403 | basename++; | |
c96fca21 SR |
1404 | else |
1405 | basename = mod->name; | |
1406 | if (!mod->gpl_compatible) | |
1407 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1408 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1409 | } |
b817f6fe SR |
1410 | } |
1411 | ||
5c3ead8c SR |
1412 | /** |
1413 | * Header for the generated file | |
1414 | **/ | |
1415 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1416 | { |
1417 | buf_printf(b, "#include <linux/module.h>\n"); | |
1418 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1419 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1420 | buf_printf(b, "\n"); | |
1421 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1422 | buf_printf(b, "\n"); | |
1da177e4 LT |
1423 | buf_printf(b, "struct module __this_module\n"); |
1424 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1425 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1426 | if (mod->has_init) |
1427 | buf_printf(b, " .init = init_module,\n"); | |
1428 | if (mod->has_cleanup) | |
1429 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1430 | " .exit = cleanup_module,\n" | |
1431 | "#endif\n"); | |
e61a1c1c | 1432 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1433 | buf_printf(b, "};\n"); |
1434 | } | |
1435 | ||
5c3ead8c SR |
1436 | /** |
1437 | * Record CRCs for unresolved symbols | |
1438 | **/ | |
c53ddacd | 1439 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1440 | { |
1441 | struct symbol *s, *exp; | |
c53ddacd | 1442 | int err = 0; |
1da177e4 LT |
1443 | |
1444 | for (s = mod->unres; s; s = s->next) { | |
1445 | exp = find_symbol(s->name); | |
1446 | if (!exp || exp->module == mod) { | |
c53ddacd | 1447 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1448 | if (warn_unresolved) { |
1449 | warn("\"%s\" [%s.ko] undefined!\n", | |
1450 | s->name, mod->name); | |
1451 | } else { | |
1452 | merror("\"%s\" [%s.ko] undefined!\n", | |
1453 | s->name, mod->name); | |
1454 | err = 1; | |
1455 | } | |
c53ddacd | 1456 | } |
1da177e4 LT |
1457 | continue; |
1458 | } | |
1459 | s->module = exp->module; | |
1460 | s->crc_valid = exp->crc_valid; | |
1461 | s->crc = exp->crc; | |
1462 | } | |
1463 | ||
1464 | if (!modversions) | |
c53ddacd | 1465 | return err; |
1da177e4 LT |
1466 | |
1467 | buf_printf(b, "\n"); | |
1468 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
1469 | buf_printf(b, "__attribute_used__\n"); | |
1470 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); | |
1471 | ||
1472 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1473 | if (!s->module) |
1da177e4 | 1474 | continue; |
1da177e4 | 1475 | if (!s->crc_valid) { |
cb80514d | 1476 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1477 | s->name, mod->name); |
1478 | continue; | |
1479 | } | |
1480 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1481 | } | |
1482 | ||
1483 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1484 | |
1485 | return err; | |
1da177e4 LT |
1486 | } |
1487 | ||
5c3ead8c SR |
1488 | static void add_depends(struct buffer *b, struct module *mod, |
1489 | struct module *modules) | |
1da177e4 LT |
1490 | { |
1491 | struct symbol *s; | |
1492 | struct module *m; | |
1493 | int first = 1; | |
1494 | ||
df578e7d | 1495 | for (m = modules; m; m = m->next) |
1da177e4 | 1496 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1497 | |
1498 | buf_printf(b, "\n"); | |
1499 | buf_printf(b, "static const char __module_depends[]\n"); | |
1500 | buf_printf(b, "__attribute_used__\n"); | |
1501 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); | |
1502 | buf_printf(b, "\"depends="); | |
1503 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1504 | const char *p; |
1da177e4 LT |
1505 | if (!s->module) |
1506 | continue; | |
1507 | ||
1508 | if (s->module->seen) | |
1509 | continue; | |
1510 | ||
1511 | s->module->seen = 1; | |
df578e7d SR |
1512 | p = strrchr(s->module->name, '/'); |
1513 | if (p) | |
a61b2dfd SR |
1514 | p++; |
1515 | else | |
1516 | p = s->module->name; | |
1517 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1518 | first = 0; |
1519 | } | |
1520 | buf_printf(b, "\";\n"); | |
1521 | } | |
1522 | ||
5c3ead8c | 1523 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1524 | { |
1525 | if (mod->srcversion[0]) { | |
1526 | buf_printf(b, "\n"); | |
1527 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1528 | mod->srcversion); | |
1529 | } | |
1530 | } | |
1531 | ||
5c3ead8c | 1532 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1533 | { |
1534 | char *tmp; | |
1535 | FILE *file; | |
1536 | struct stat st; | |
1537 | ||
1538 | file = fopen(fname, "r"); | |
1539 | if (!file) | |
1540 | goto write; | |
1541 | ||
1542 | if (fstat(fileno(file), &st) < 0) | |
1543 | goto close_write; | |
1544 | ||
1545 | if (st.st_size != b->pos) | |
1546 | goto close_write; | |
1547 | ||
1548 | tmp = NOFAIL(malloc(b->pos)); | |
1549 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1550 | goto free_write; | |
1551 | ||
1552 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1553 | goto free_write; | |
1554 | ||
1555 | free(tmp); | |
1556 | fclose(file); | |
1557 | return; | |
1558 | ||
1559 | free_write: | |
1560 | free(tmp); | |
1561 | close_write: | |
1562 | fclose(file); | |
1563 | write: | |
1564 | file = fopen(fname, "w"); | |
1565 | if (!file) { | |
1566 | perror(fname); | |
1567 | exit(1); | |
1568 | } | |
1569 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1570 | perror(fname); | |
1571 | exit(1); | |
1572 | } | |
1573 | fclose(file); | |
1574 | } | |
1575 | ||
bd5cbced | 1576 | /* parse Module.symvers file. line format: |
534b89a9 | 1577 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1578 | **/ |
040fcc81 | 1579 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1580 | { |
1581 | unsigned long size, pos = 0; | |
1582 | void *file = grab_file(fname, &size); | |
1583 | char *line; | |
1584 | ||
df578e7d | 1585 | if (!file) |
1da177e4 LT |
1586 | /* No symbol versions, silently ignore */ |
1587 | return; | |
1588 | ||
1589 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1590 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1591 | unsigned int crc; |
1592 | struct module *mod; | |
040fcc81 | 1593 | struct symbol *s; |
1da177e4 LT |
1594 | |
1595 | if (!(symname = strchr(line, '\t'))) | |
1596 | goto fail; | |
1597 | *symname++ = '\0'; | |
1598 | if (!(modname = strchr(symname, '\t'))) | |
1599 | goto fail; | |
1600 | *modname++ = '\0'; | |
9ac545b0 | 1601 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1602 | *export++ = '\0'; |
534b89a9 SR |
1603 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1604 | *end = '\0'; | |
1da177e4 LT |
1605 | crc = strtoul(line, &d, 16); |
1606 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1607 | goto fail; | |
df578e7d SR |
1608 | mod = find_module(modname); |
1609 | if (!mod) { | |
1610 | if (is_vmlinux(modname)) | |
1da177e4 | 1611 | have_vmlinux = 1; |
1da177e4 LT |
1612 | mod = new_module(NOFAIL(strdup(modname))); |
1613 | mod->skip = 1; | |
1614 | } | |
bd5cbced | 1615 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1616 | s->kernel = kernel; |
1617 | s->preloaded = 1; | |
bd5cbced | 1618 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1619 | } |
1620 | return; | |
1621 | fail: | |
1622 | fatal("parse error in symbol dump file\n"); | |
1623 | } | |
1624 | ||
040fcc81 SR |
1625 | /* For normal builds always dump all symbols. |
1626 | * For external modules only dump symbols | |
1627 | * that are not read from kernel Module.symvers. | |
1628 | **/ | |
1629 | static int dump_sym(struct symbol *sym) | |
1630 | { | |
1631 | if (!external_module) | |
1632 | return 1; | |
1633 | if (sym->vmlinux || sym->kernel) | |
1634 | return 0; | |
1635 | return 1; | |
1636 | } | |
62070fa4 | 1637 | |
5c3ead8c | 1638 | static void write_dump(const char *fname) |
1da177e4 LT |
1639 | { |
1640 | struct buffer buf = { }; | |
1641 | struct symbol *symbol; | |
1642 | int n; | |
1643 | ||
1644 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1645 | symbol = symbolhash[n]; | |
1646 | while (symbol) { | |
040fcc81 | 1647 | if (dump_sym(symbol)) |
bd5cbced | 1648 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1649 | symbol->crc, symbol->name, |
bd5cbced RP |
1650 | symbol->module->name, |
1651 | export_str(symbol->export)); | |
1da177e4 LT |
1652 | symbol = symbol->next; |
1653 | } | |
1654 | } | |
1655 | write_if_changed(&buf, fname); | |
1656 | } | |
1657 | ||
5c3ead8c | 1658 | int main(int argc, char **argv) |
1da177e4 LT |
1659 | { |
1660 | struct module *mod; | |
1661 | struct buffer buf = { }; | |
040fcc81 SR |
1662 | char *kernel_read = NULL, *module_read = NULL; |
1663 | char *dump_write = NULL; | |
1da177e4 | 1664 | int opt; |
c53ddacd | 1665 | int err; |
1da177e4 | 1666 | |
8d8d8289 | 1667 | while ((opt = getopt(argc, argv, "i:I:mso:aw")) != -1) { |
df578e7d SR |
1668 | switch (opt) { |
1669 | case 'i': | |
1670 | kernel_read = optarg; | |
1671 | break; | |
1672 | case 'I': | |
1673 | module_read = optarg; | |
1674 | external_module = 1; | |
1675 | break; | |
1676 | case 'm': | |
1677 | modversions = 1; | |
1678 | break; | |
1679 | case 'o': | |
1680 | dump_write = optarg; | |
1681 | break; | |
1682 | case 'a': | |
1683 | all_versions = 1; | |
1684 | break; | |
1685 | case 's': | |
1686 | vmlinux_section_warnings = 0; | |
1687 | break; | |
1688 | case 'w': | |
1689 | warn_unresolved = 1; | |
1690 | break; | |
1691 | default: | |
1692 | exit(1); | |
1da177e4 LT |
1693 | } |
1694 | } | |
1695 | ||
040fcc81 SR |
1696 | if (kernel_read) |
1697 | read_dump(kernel_read, 1); | |
1698 | if (module_read) | |
1699 | read_dump(module_read, 0); | |
1da177e4 | 1700 | |
df578e7d | 1701 | while (optind < argc) |
1da177e4 | 1702 | read_symbols(argv[optind++]); |
1da177e4 | 1703 | |
b817f6fe SR |
1704 | for (mod = modules; mod; mod = mod->next) { |
1705 | if (mod->skip) | |
1706 | continue; | |
c96fca21 | 1707 | check_exports(mod); |
b817f6fe SR |
1708 | } |
1709 | ||
c53ddacd KK |
1710 | err = 0; |
1711 | ||
1da177e4 | 1712 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
1713 | char fname[strlen(mod->name) + 10]; |
1714 | ||
1da177e4 LT |
1715 | if (mod->skip) |
1716 | continue; | |
1717 | ||
1718 | buf.pos = 0; | |
1719 | ||
1720 | add_header(&buf, mod); | |
c53ddacd | 1721 | err |= add_versions(&buf, mod); |
1da177e4 LT |
1722 | add_depends(&buf, mod, modules); |
1723 | add_moddevtable(&buf, mod); | |
1724 | add_srcversion(&buf, mod); | |
1725 | ||
1726 | sprintf(fname, "%s.mod.c", mod->name); | |
1727 | write_if_changed(&buf, fname); | |
1728 | } | |
1729 | ||
1730 | if (dump_write) | |
1731 | write_dump(dump_write); | |
1732 | ||
c53ddacd | 1733 | return err; |
1da177e4 | 1734 | } |