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Commit | Line | Data |
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1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
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 | ||
b2e3e658 MD |
14 | #define _GNU_SOURCE |
15 | #include <stdio.h> | |
1da177e4 | 16 | #include <ctype.h> |
5003bab8 | 17 | #include <string.h> |
1da177e4 | 18 | #include "modpost.h" |
5a865c06 | 19 | #include "../../include/generated/autoconf.h" |
b817f6fe | 20 | #include "../../include/linux/license.h" |
1da177e4 | 21 | |
9e1b9b80 AJ |
22 | /* Some toolchains use a `_' prefix for all user symbols. */ |
23 | #ifdef CONFIG_SYMBOL_PREFIX | |
24 | #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX | |
25 | #else | |
26 | #define MODULE_SYMBOL_PREFIX "" | |
27 | #endif | |
28 | ||
29 | ||
1da177e4 LT |
30 | /* Are we using CONFIG_MODVERSIONS? */ |
31 | int modversions = 0; | |
32 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
33 | int have_vmlinux = 0; | |
34 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
35 | static int all_versions = 0; | |
040fcc81 SR |
36 | /* If we are modposting external module set to 1 */ |
37 | static int external_module = 0; | |
8d8d8289 SR |
38 | /* Warn about section mismatch in vmlinux if set to 1 */ |
39 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
40 | /* Only warn about unresolved symbols */ |
41 | static int warn_unresolved = 0; | |
bd5cbced | 42 | /* How a symbol is exported */ |
588ccd73 SR |
43 | static int sec_mismatch_count = 0; |
44 | static int sec_mismatch_verbose = 1; | |
45 | ||
c96fca21 SR |
46 | enum export { |
47 | export_plain, export_unused, export_gpl, | |
48 | export_unused_gpl, export_gpl_future, export_unknown | |
49 | }; | |
1da177e4 | 50 | |
6d9a89ea AK |
51 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
52 | ||
53 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
54 | { |
55 | va_list arglist; | |
56 | ||
57 | fprintf(stderr, "FATAL: "); | |
58 | ||
59 | va_start(arglist, fmt); | |
60 | vfprintf(stderr, fmt, arglist); | |
61 | va_end(arglist); | |
62 | ||
63 | exit(1); | |
64 | } | |
65 | ||
6d9a89ea | 66 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
67 | { |
68 | va_list arglist; | |
69 | ||
70 | fprintf(stderr, "WARNING: "); | |
71 | ||
72 | va_start(arglist, fmt); | |
73 | vfprintf(stderr, fmt, arglist); | |
74 | va_end(arglist); | |
75 | } | |
76 | ||
6d9a89ea | 77 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
78 | { |
79 | va_list arglist; | |
80 | ||
81 | fprintf(stderr, "ERROR: "); | |
82 | ||
83 | va_start(arglist, fmt); | |
84 | vfprintf(stderr, fmt, arglist); | |
85 | va_end(arglist); | |
86 | } | |
87 | ||
040fcc81 SR |
88 | static int is_vmlinux(const char *modname) |
89 | { | |
90 | const char *myname; | |
91 | ||
df578e7d SR |
92 | myname = strrchr(modname, '/'); |
93 | if (myname) | |
040fcc81 SR |
94 | myname++; |
95 | else | |
96 | myname = modname; | |
97 | ||
741f98fe SR |
98 | return (strcmp(myname, "vmlinux") == 0) || |
99 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
100 | } |
101 | ||
1da177e4 LT |
102 | void *do_nofail(void *ptr, const char *expr) |
103 | { | |
df578e7d | 104 | if (!ptr) |
1da177e4 | 105 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 106 | |
1da177e4 LT |
107 | return ptr; |
108 | } | |
109 | ||
110 | /* A list of all modules we processed */ | |
1da177e4 LT |
111 | static struct module *modules; |
112 | ||
5c3ead8c | 113 | static struct module *find_module(char *modname) |
1da177e4 LT |
114 | { |
115 | struct module *mod; | |
116 | ||
117 | for (mod = modules; mod; mod = mod->next) | |
118 | if (strcmp(mod->name, modname) == 0) | |
119 | break; | |
120 | return mod; | |
121 | } | |
122 | ||
5c3ead8c | 123 | static struct module *new_module(char *modname) |
1da177e4 LT |
124 | { |
125 | struct module *mod; | |
126 | char *p, *s; | |
62070fa4 | 127 | |
1da177e4 LT |
128 | mod = NOFAIL(malloc(sizeof(*mod))); |
129 | memset(mod, 0, sizeof(*mod)); | |
130 | p = NOFAIL(strdup(modname)); | |
131 | ||
132 | /* strip trailing .o */ | |
df578e7d SR |
133 | s = strrchr(p, '.'); |
134 | if (s != NULL) | |
1da177e4 LT |
135 | if (strcmp(s, ".o") == 0) |
136 | *s = '\0'; | |
137 | ||
138 | /* add to list */ | |
139 | mod->name = p; | |
b817f6fe | 140 | mod->gpl_compatible = -1; |
1da177e4 LT |
141 | mod->next = modules; |
142 | modules = mod; | |
143 | ||
144 | return mod; | |
145 | } | |
146 | ||
147 | /* A hash of all exported symbols, | |
148 | * struct symbol is also used for lists of unresolved symbols */ | |
149 | ||
150 | #define SYMBOL_HASH_SIZE 1024 | |
151 | ||
152 | struct symbol { | |
153 | struct symbol *next; | |
154 | struct module *module; | |
155 | unsigned int crc; | |
156 | int crc_valid; | |
157 | unsigned int weak:1; | |
040fcc81 SR |
158 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
159 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
160 | * (only for external modules) **/ | |
8e70c458 | 161 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 162 | enum export export; /* Type of export */ |
1da177e4 LT |
163 | char name[0]; |
164 | }; | |
165 | ||
166 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
167 | ||
168 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
169 | static inline unsigned int tdb_hash(const char *name) | |
170 | { | |
171 | unsigned value; /* Used to compute the hash value. */ | |
172 | unsigned i; /* Used to cycle through random values. */ | |
173 | ||
174 | /* Set the initial value from the key size. */ | |
df578e7d | 175 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
176 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
177 | ||
178 | return (1103515243 * value + 12345); | |
179 | } | |
180 | ||
5c3ead8c SR |
181 | /** |
182 | * Allocate a new symbols for use in the hash of exported symbols or | |
183 | * the list of unresolved symbols per module | |
184 | **/ | |
185 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
186 | struct symbol *next) | |
1da177e4 LT |
187 | { |
188 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
189 | ||
190 | memset(s, 0, sizeof(*s)); | |
191 | strcpy(s->name, name); | |
192 | s->weak = weak; | |
193 | s->next = next; | |
194 | return s; | |
195 | } | |
196 | ||
197 | /* For the hash of exported symbols */ | |
bd5cbced RP |
198 | static struct symbol *new_symbol(const char *name, struct module *module, |
199 | enum export export) | |
1da177e4 LT |
200 | { |
201 | unsigned int hash; | |
202 | struct symbol *new; | |
203 | ||
204 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
205 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
206 | new->module = module; | |
bd5cbced | 207 | new->export = export; |
040fcc81 | 208 | return new; |
1da177e4 LT |
209 | } |
210 | ||
5c3ead8c | 211 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
212 | { |
213 | struct symbol *s; | |
214 | ||
215 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
216 | if (name[0] == '.') | |
217 | name++; | |
218 | ||
df578e7d | 219 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
220 | if (strcmp(s->name, name) == 0) |
221 | return s; | |
222 | } | |
223 | return NULL; | |
224 | } | |
225 | ||
bd5cbced RP |
226 | static struct { |
227 | const char *str; | |
228 | enum export export; | |
229 | } export_list[] = { | |
230 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 231 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 232 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 233 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
234 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
235 | { .str = "(unknown)", .export = export_unknown }, | |
236 | }; | |
237 | ||
238 | ||
239 | static const char *export_str(enum export ex) | |
240 | { | |
241 | return export_list[ex].str; | |
242 | } | |
243 | ||
df578e7d | 244 | static enum export export_no(const char *s) |
bd5cbced RP |
245 | { |
246 | int i; | |
df578e7d | 247 | |
534b89a9 SR |
248 | if (!s) |
249 | return export_unknown; | |
bd5cbced RP |
250 | for (i = 0; export_list[i].export != export_unknown; i++) { |
251 | if (strcmp(export_list[i].str, s) == 0) | |
252 | return export_list[i].export; | |
253 | } | |
254 | return export_unknown; | |
255 | } | |
256 | ||
1ce53adf | 257 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
258 | { |
259 | if (sec == elf->export_sec) | |
260 | return export_plain; | |
c96fca21 SR |
261 | else if (sec == elf->export_unused_sec) |
262 | return export_unused; | |
bd5cbced RP |
263 | else if (sec == elf->export_gpl_sec) |
264 | return export_gpl; | |
c96fca21 SR |
265 | else if (sec == elf->export_unused_gpl_sec) |
266 | return export_unused_gpl; | |
bd5cbced RP |
267 | else if (sec == elf->export_gpl_future_sec) |
268 | return export_gpl_future; | |
269 | else | |
270 | return export_unknown; | |
271 | } | |
272 | ||
5c3ead8c SR |
273 | /** |
274 | * Add an exported symbol - it may have already been added without a | |
275 | * CRC, in this case just update the CRC | |
276 | **/ | |
bd5cbced RP |
277 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
278 | enum export export) | |
1da177e4 LT |
279 | { |
280 | struct symbol *s = find_symbol(name); | |
281 | ||
282 | if (!s) { | |
bd5cbced | 283 | s = new_symbol(name, mod, export); |
8e70c458 SR |
284 | } else { |
285 | if (!s->preloaded) { | |
7b75b13c | 286 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
287 | "was in %s%s\n", mod->name, name, |
288 | s->module->name, | |
289 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
290 | } else { |
291 | /* In case Modules.symvers was out of date */ | |
292 | s->module = mod; | |
8e70c458 | 293 | } |
1da177e4 | 294 | } |
8e70c458 | 295 | s->preloaded = 0; |
040fcc81 SR |
296 | s->vmlinux = is_vmlinux(mod->name); |
297 | s->kernel = 0; | |
bd5cbced | 298 | s->export = export; |
040fcc81 SR |
299 | return s; |
300 | } | |
301 | ||
302 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 303 | unsigned int crc, enum export export) |
040fcc81 SR |
304 | { |
305 | struct symbol *s = find_symbol(name); | |
306 | ||
307 | if (!s) | |
bd5cbced | 308 | s = new_symbol(name, mod, export); |
040fcc81 SR |
309 | s->crc = crc; |
310 | s->crc_valid = 1; | |
1da177e4 LT |
311 | } |
312 | ||
5c3ead8c | 313 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
314 | { |
315 | struct stat st; | |
316 | void *map; | |
317 | int fd; | |
318 | ||
319 | fd = open(filename, O_RDONLY); | |
320 | if (fd < 0 || fstat(fd, &st) != 0) | |
321 | return NULL; | |
322 | ||
323 | *size = st.st_size; | |
324 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
325 | close(fd); | |
326 | ||
327 | if (map == MAP_FAILED) | |
328 | return NULL; | |
329 | return map; | |
330 | } | |
331 | ||
5c3ead8c SR |
332 | /** |
333 | * Return a copy of the next line in a mmap'ed file. | |
334 | * spaces in the beginning of the line is trimmed away. | |
335 | * Return a pointer to a static buffer. | |
336 | **/ | |
df578e7d | 337 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
338 | { |
339 | static char line[4096]; | |
340 | int skip = 1; | |
341 | size_t len = 0; | |
342 | signed char *p = (signed char *)file + *pos; | |
343 | char *s = line; | |
344 | ||
df578e7d | 345 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
346 | if (skip && isspace(*p)) { |
347 | p++; | |
348 | continue; | |
349 | } | |
350 | skip = 0; | |
351 | if (*p != '\n' && (*pos < size)) { | |
352 | len++; | |
353 | *s++ = *p++; | |
354 | if (len > 4095) | |
355 | break; /* Too long, stop */ | |
356 | } else { | |
357 | /* End of string */ | |
358 | *s = '\0'; | |
359 | return line; | |
360 | } | |
361 | } | |
362 | /* End of buffer */ | |
363 | return NULL; | |
364 | } | |
365 | ||
5c3ead8c | 366 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
367 | { |
368 | munmap(file, size); | |
369 | } | |
370 | ||
85bd2fdd | 371 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
372 | { |
373 | unsigned int i; | |
85bd2fdd | 374 | Elf_Ehdr *hdr; |
1da177e4 LT |
375 | Elf_Shdr *sechdrs; |
376 | Elf_Sym *sym; | |
1ce53adf DV |
377 | const char *secstrings; |
378 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
379 | |
380 | hdr = grab_file(filename, &info->size); | |
381 | if (!hdr) { | |
382 | perror(filename); | |
6803dc0e | 383 | exit(1); |
1da177e4 LT |
384 | } |
385 | info->hdr = hdr; | |
85bd2fdd SR |
386 | if (info->size < sizeof(*hdr)) { |
387 | /* file too small, assume this is an empty .o file */ | |
388 | return 0; | |
389 | } | |
390 | /* Is this a valid ELF file? */ | |
391 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
392 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
393 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
394 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
395 | /* Not an ELF file - silently ignore it */ | |
396 | return 0; | |
397 | } | |
1da177e4 | 398 | /* Fix endianness in ELF header */ |
7d875a02 AK |
399 | hdr->e_type = TO_NATIVE(hdr->e_type); |
400 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
401 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
402 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
403 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
404 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
405 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
406 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
407 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
408 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
409 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
410 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
411 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
412 | sechdrs = (void *)hdr + hdr->e_shoff; |
413 | info->sechdrs = sechdrs; | |
414 | ||
a83710e5 PS |
415 | /* Check if file offset is correct */ |
416 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
417 | fatal("section header offset=%lu in file '%s' is bigger than " |
418 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
419 | filename, info->size); | |
a83710e5 PS |
420 | return 0; |
421 | } | |
422 | ||
1ce53adf DV |
423 | if (hdr->e_shnum == 0) { |
424 | /* | |
425 | * There are more than 64k sections, | |
426 | * read count from .sh_size. | |
427 | * note: it doesn't need shndx2secindex() | |
428 | */ | |
429 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
430 | } | |
431 | else { | |
432 | info->num_sections = hdr->e_shnum; | |
433 | } | |
434 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
435 | info->secindex_strings = | |
436 | shndx2secindex(TO_NATIVE(sechdrs[0].sh_link)); | |
437 | } | |
438 | else { | |
439 | info->secindex_strings = hdr->e_shstrndx; | |
440 | } | |
441 | ||
1da177e4 | 442 | /* Fix endianness in section headers */ |
1ce53adf | 443 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
444 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
445 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
446 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
447 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
448 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
449 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
450 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
451 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
452 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
453 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
454 | } |
455 | /* Find symbol table. */ | |
1ce53adf DV |
456 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
457 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 458 | const char *secname; |
56fc82c5 | 459 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 460 | |
56fc82c5 | 461 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
462 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
463 | "sizeof(*hrd)=%zu\n", filename, | |
464 | (unsigned long)sechdrs[i].sh_offset, | |
465 | sizeof(*hdr)); | |
85bd2fdd SR |
466 | return 0; |
467 | } | |
bd5cbced RP |
468 | secname = secstrings + sechdrs[i].sh_name; |
469 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
470 | if (nobits) |
471 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
472 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
473 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
474 | } else if (strcmp(secname, "__ksymtab") == 0) |
475 | info->export_sec = i; | |
c96fca21 SR |
476 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
477 | info->export_unused_sec = i; | |
bd5cbced RP |
478 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
479 | info->export_gpl_sec = i; | |
c96fca21 SR |
480 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
481 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
482 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
483 | info->export_gpl_future_sec = i; | |
484 | ||
1ce53adf DV |
485 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
486 | unsigned int sh_link_idx; | |
487 | symtab_idx = i; | |
488 | info->symtab_start = (void *)hdr + | |
489 | sechdrs[i].sh_offset; | |
490 | info->symtab_stop = (void *)hdr + | |
491 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
492 | sh_link_idx = shndx2secindex(sechdrs[i].sh_link); | |
493 | info->strtab = (void *)hdr + | |
494 | sechdrs[sh_link_idx].sh_offset; | |
495 | } | |
1da177e4 | 496 | |
1ce53adf DV |
497 | /* 32bit section no. table? ("more than 64k sections") */ |
498 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
499 | symtab_shndx_idx = i; | |
500 | info->symtab_shndx_start = (void *)hdr + | |
501 | sechdrs[i].sh_offset; | |
502 | info->symtab_shndx_stop = (void *)hdr + | |
503 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
504 | } | |
1da177e4 | 505 | } |
df578e7d | 506 | if (!info->symtab_start) |
cb80514d | 507 | fatal("%s has no symtab?\n", filename); |
df578e7d | 508 | |
1da177e4 LT |
509 | /* Fix endianness in symbols */ |
510 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
511 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
512 | sym->st_name = TO_NATIVE(sym->st_name); | |
513 | sym->st_value = TO_NATIVE(sym->st_value); | |
514 | sym->st_size = TO_NATIVE(sym->st_size); | |
515 | } | |
1ce53adf DV |
516 | |
517 | if (symtab_shndx_idx != ~0U) { | |
518 | Elf32_Word *p; | |
519 | if (symtab_idx != | |
520 | shndx2secindex(sechdrs[symtab_shndx_idx].sh_link)) | |
521 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", | |
522 | filename, | |
523 | shndx2secindex(sechdrs[symtab_shndx_idx].sh_link), | |
524 | symtab_idx); | |
525 | /* Fix endianness */ | |
526 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
527 | p++) | |
528 | *p = TO_NATIVE(*p); | |
529 | } | |
530 | ||
85bd2fdd | 531 | return 1; |
1da177e4 LT |
532 | } |
533 | ||
5c3ead8c | 534 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
535 | { |
536 | release_file(info->hdr, info->size); | |
537 | } | |
538 | ||
4d7365d6 SR |
539 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
540 | { | |
541 | /* ignore __this_module, it will be resolved shortly */ | |
542 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
543 | return 1; | |
544 | /* ignore global offset table */ | |
545 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
546 | return 1; | |
547 | if (info->hdr->e_machine == EM_PPC) | |
548 | /* Special register function linked on all modules during final link of .ko */ | |
549 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
550 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
551 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
552 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
553 | return 1; | |
7fca5dc8 SR |
554 | if (info->hdr->e_machine == EM_PPC64) |
555 | /* Special register function linked on all modules during final link of .ko */ | |
556 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
557 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) | |
558 | return 1; | |
4d7365d6 SR |
559 | /* Do not ignore this symbol */ |
560 | return 0; | |
561 | } | |
562 | ||
f7b05e64 LY |
563 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
564 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 565 | |
5c3ead8c SR |
566 | static void handle_modversions(struct module *mod, struct elf_info *info, |
567 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
568 | { |
569 | unsigned int crc; | |
1ce53adf | 570 | enum export export = export_from_sec(info, get_secindex(info, sym)); |
1da177e4 LT |
571 | |
572 | switch (sym->st_shndx) { | |
573 | case SHN_COMMON: | |
cb80514d | 574 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
575 | break; |
576 | case SHN_ABS: | |
577 | /* CRC'd symbol */ | |
8d99513c | 578 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 579 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
580 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
581 | export); | |
1da177e4 LT |
582 | } |
583 | break; | |
584 | case SHN_UNDEF: | |
585 | /* undefined symbol */ | |
586 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
587 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
588 | break; | |
4d7365d6 | 589 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 590 | break; |
8d529014 BC |
591 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
592 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
593 | /* add compatibility with older glibc */ | |
594 | #ifndef STT_SPARC_REGISTER | |
595 | #define STT_SPARC_REGISTER STT_REGISTER | |
596 | #endif | |
1da177e4 LT |
597 | if (info->hdr->e_machine == EM_SPARC || |
598 | info->hdr->e_machine == EM_SPARCV9) { | |
599 | /* Ignore register directives. */ | |
8d529014 | 600 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 601 | break; |
62070fa4 SR |
602 | if (symname[0] == '.') { |
603 | char *munged = strdup(symname); | |
604 | munged[0] = '_'; | |
605 | munged[1] = toupper(munged[1]); | |
606 | symname = munged; | |
607 | } | |
1da177e4 LT |
608 | } |
609 | #endif | |
62070fa4 | 610 | |
1da177e4 | 611 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
612 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
613 | mod->unres = | |
614 | alloc_symbol(symname + | |
615 | strlen(MODULE_SYMBOL_PREFIX), | |
616 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
617 | mod->unres); | |
618 | } | |
1da177e4 LT |
619 | break; |
620 | default: | |
621 | /* All exported symbols */ | |
8d99513c | 622 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
623 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
624 | export); | |
1da177e4 LT |
625 | } |
626 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
627 | mod->has_init = 1; | |
628 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
629 | mod->has_cleanup = 1; | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
5c3ead8c SR |
634 | /** |
635 | * Parse tag=value strings from .modinfo section | |
636 | **/ | |
1da177e4 LT |
637 | static char *next_string(char *string, unsigned long *secsize) |
638 | { | |
639 | /* Skip non-zero chars */ | |
640 | while (string[0]) { | |
641 | string++; | |
642 | if ((*secsize)-- <= 1) | |
643 | return NULL; | |
644 | } | |
645 | ||
646 | /* Skip any zero padding. */ | |
647 | while (!string[0]) { | |
648 | string++; | |
649 | if ((*secsize)-- <= 1) | |
650 | return NULL; | |
651 | } | |
652 | return string; | |
653 | } | |
654 | ||
b817f6fe SR |
655 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
656 | const char *tag, char *info) | |
1da177e4 LT |
657 | { |
658 | char *p; | |
659 | unsigned int taglen = strlen(tag); | |
660 | unsigned long size = modinfo_len; | |
661 | ||
b817f6fe SR |
662 | if (info) { |
663 | size -= info - (char *)modinfo; | |
664 | modinfo = next_string(info, &size); | |
665 | } | |
666 | ||
1da177e4 LT |
667 | for (p = modinfo; p; p = next_string(p, &size)) { |
668 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
669 | return p + taglen + 1; | |
670 | } | |
671 | return NULL; | |
672 | } | |
673 | ||
b817f6fe SR |
674 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
675 | const char *tag) | |
676 | ||
677 | { | |
678 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
679 | } | |
680 | ||
4c8fbca5 SR |
681 | /** |
682 | * Test if string s ends in string sub | |
683 | * return 0 if match | |
684 | **/ | |
685 | static int strrcmp(const char *s, const char *sub) | |
686 | { | |
df578e7d | 687 | int slen, sublen; |
62070fa4 | 688 | |
4c8fbca5 SR |
689 | if (!s || !sub) |
690 | return 1; | |
62070fa4 | 691 | |
4c8fbca5 | 692 | slen = strlen(s); |
df578e7d | 693 | sublen = strlen(sub); |
62070fa4 | 694 | |
4c8fbca5 SR |
695 | if ((slen == 0) || (sublen == 0)) |
696 | return 1; | |
697 | ||
df578e7d SR |
698 | if (sublen > slen) |
699 | return 1; | |
4c8fbca5 | 700 | |
df578e7d | 701 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
702 | } |
703 | ||
ff13f926 SR |
704 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
705 | { | |
58fb0d4f SR |
706 | if (sym) |
707 | return elf->strtab + sym->st_name; | |
708 | else | |
f666751a | 709 | return "(unknown)"; |
ff13f926 SR |
710 | } |
711 | ||
1ce53adf | 712 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
713 | { |
714 | Elf_Shdr *sechdrs = elf->sechdrs; | |
715 | return (void *)elf->hdr + | |
1ce53adf DV |
716 | elf->sechdrs[elf->secindex_strings].sh_offset + |
717 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
718 | } |
719 | ||
720 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
721 | { | |
722 | return (void *)elf->hdr + | |
1ce53adf DV |
723 | elf->sechdrs[elf->secindex_strings].sh_offset + |
724 | sechdr->sh_name; | |
ff13f926 SR |
725 | } |
726 | ||
10668220 SR |
727 | /* if sym is empty or point to a string |
728 | * like ".[0-9]+" then return 1. | |
729 | * This is the optional prefix added by ld to some sections | |
730 | */ | |
731 | static int number_prefix(const char *sym) | |
732 | { | |
733 | if (*sym++ == '\0') | |
734 | return 1; | |
735 | if (*sym != '.') | |
736 | return 0; | |
737 | do { | |
738 | char c = *sym++; | |
739 | if (c < '0' || c > '9') | |
740 | return 0; | |
741 | } while (*sym); | |
742 | return 1; | |
743 | } | |
744 | ||
745 | /* The pattern is an array of simple patterns. | |
746 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 747 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
748 | * "foo*" will match a string that begins with "foo" |
749 | * "foo$" will match a string equal to "foo" or "foo.1" | |
750 | * where the '1' can be any number including several digits. | |
751 | * The $ syntax is for sections where ld append a dot number | |
752 | * to make section name unique. | |
753 | */ | |
5c725138 | 754 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
755 | { |
756 | const char *p; | |
757 | while (*pat) { | |
758 | p = *pat++; | |
759 | const char *endp = p + strlen(p) - 1; | |
760 | ||
6c5bd235 SR |
761 | /* "*foo" */ |
762 | if (*p == '*') { | |
763 | if (strrcmp(sym, p + 1) == 0) | |
764 | return 1; | |
765 | } | |
10668220 | 766 | /* "foo*" */ |
6c5bd235 | 767 | else if (*endp == '*') { |
10668220 SR |
768 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
769 | return 1; | |
770 | } | |
771 | /* "foo$" */ | |
772 | else if (*endp == '$') { | |
773 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
774 | if (number_prefix(sym + strlen(p) - 1)) | |
775 | return 1; | |
776 | } | |
777 | } | |
778 | /* no wildcards */ | |
779 | else { | |
780 | if (strcmp(p, sym) == 0) | |
781 | return 1; | |
782 | } | |
783 | } | |
784 | /* no match */ | |
785 | return 0; | |
786 | } | |
787 | ||
10668220 SR |
788 | /* sections that we do not want to do full section mismatch check on */ |
789 | static const char *section_white_list[] = | |
4391ed6a SR |
790 | { |
791 | ".comment*", | |
792 | ".debug*", | |
019fca84 | 793 | ".GCC-command-line", /* mn10300 */ |
4391ed6a SR |
794 | ".mdebug*", /* alpha, score, mips etc. */ |
795 | ".pdr", /* alpha, score, mips etc. */ | |
796 | ".stab*", | |
797 | ".note*", | |
798 | ".got*", | |
799 | ".toc*", | |
800 | NULL | |
801 | }; | |
10668220 | 802 | |
e241a630 | 803 | /* |
b614a697 | 804 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 805 | * The cause of this is often a section specified in assembler |
b614a697 | 806 | * without "ax" / "aw". |
e241a630 | 807 | */ |
b614a697 AK |
808 | static void check_section(const char *modname, struct elf_info *elf, |
809 | Elf_Shdr *sechdr) | |
e241a630 | 810 | { |
b614a697 AK |
811 | const char *sec = sech_name(elf, sechdr); |
812 | ||
813 | if (sechdr->sh_type == SHT_PROGBITS && | |
814 | !(sechdr->sh_flags & SHF_ALLOC) && | |
815 | !match(sec, section_white_list)) { | |
816 | warn("%s (%s): unexpected non-allocatable section.\n" | |
817 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
818 | "Note that for example <linux/init.h> contains\n" | |
819 | "section definitions for use in .S files.\n\n", | |
820 | modname, sec); | |
e241a630 | 821 | } |
e241a630 SR |
822 | } |
823 | ||
824 | ||
825 | ||
eb8f6890 | 826 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d JB |
827 | ".init.setup$", ".init.rodata$", \ |
828 | ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ | |
eb8f6890 SR |
829 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" |
830 | #define ALL_EXIT_DATA_SECTIONS \ | |
831 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 832 | |
eb8f6890 SR |
833 | #define ALL_INIT_TEXT_SECTIONS \ |
834 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
835 | #define ALL_EXIT_TEXT_SECTIONS \ | |
836 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 837 | |
4a31a229 UKK |
838 | #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \ |
839 | MEM_INIT_SECTIONS | |
840 | #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \ | |
841 | MEM_EXIT_SECTIONS | |
842 | ||
843 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
844 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 845 | |
6c5bd235 | 846 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
847 | #define TEXT_SECTIONS ".text$" |
848 | ||
fd6c3a8d JB |
849 | #define INIT_SECTIONS ".init.*" |
850 | #define DEV_INIT_SECTIONS ".devinit.*" | |
851 | #define CPU_INIT_SECTIONS ".cpuinit.*" | |
852 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 853 | |
fd6c3a8d JB |
854 | #define EXIT_SECTIONS ".exit.*" |
855 | #define DEV_EXIT_SECTIONS ".devexit.*" | |
856 | #define CPU_EXIT_SECTIONS ".cpuexit.*" | |
857 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 858 | |
6c5bd235 | 859 | /* init data sections */ |
eb8f6890 | 860 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
861 | |
862 | /* all init sections */ | |
eb8f6890 | 863 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
864 | |
865 | /* All init and exit sections (code + data) */ | |
866 | static const char *init_exit_sections[] = | |
eb8f6890 | 867 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
868 | |
869 | /* data section */ | |
870 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
871 | ||
6c5bd235 SR |
872 | |
873 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
874 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
875 | "*driver", \ | |
876 | "*_template", /* scsi uses *_template a lot */ \ | |
877 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
878 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
879 | "*_ops", \ | |
880 | "*_probe", \ | |
881 | "*_probe_one", \ | |
882 | "*_console" | |
6c5bd235 SR |
883 | |
884 | static const char *head_sections[] = { ".head.text*", NULL }; | |
885 | static const char *linker_symbols[] = | |
886 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
887 | ||
588ccd73 | 888 | enum mismatch { |
bbd3f4fb UKK |
889 | TEXT_TO_ANY_INIT, |
890 | DATA_TO_ANY_INIT, | |
891 | TEXT_TO_ANY_EXIT, | |
892 | DATA_TO_ANY_EXIT, | |
893 | XXXINIT_TO_SOME_INIT, | |
894 | XXXEXIT_TO_SOME_EXIT, | |
895 | ANY_INIT_TO_ANY_EXIT, | |
896 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
897 | EXPORT_TO_INIT_EXIT, |
898 | }; | |
899 | ||
10668220 SR |
900 | struct sectioncheck { |
901 | const char *fromsec[20]; | |
902 | const char *tosec[20]; | |
588ccd73 | 903 | enum mismatch mismatch; |
af92a82d | 904 | const char *symbol_white_list[20]; |
10668220 SR |
905 | }; |
906 | ||
907 | const struct sectioncheck sectioncheck[] = { | |
908 | /* Do not reference init/exit code/data from | |
909 | * normal code and data | |
910 | */ | |
911 | { | |
588ccd73 SR |
912 | .fromsec = { TEXT_SECTIONS, NULL }, |
913 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 914 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 915 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
916 | }, |
917 | { | |
918 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 919 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 920 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 921 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 922 | }, |
0db25245 UKK |
923 | { |
924 | .fromsec = { DATA_SECTIONS, NULL }, | |
925 | .tosec = { INIT_SECTIONS, NULL }, | |
926 | .mismatch = DATA_TO_ANY_INIT, | |
927 | .symbol_white_list = { | |
928 | "*_template", "*_timer", "*_sht", "*_ops", | |
929 | "*_probe", "*_probe_one", "*_console", NULL | |
930 | }, | |
931 | }, | |
588ccd73 SR |
932 | { |
933 | .fromsec = { TEXT_SECTIONS, NULL }, | |
934 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 935 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 936 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
937 | }, |
938 | { | |
939 | .fromsec = { DATA_SECTIONS, NULL }, | |
940 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 941 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 942 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 SR |
943 | }, |
944 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
945 | { | |
4a31a229 | 946 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 947 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 948 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 949 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 950 | }, |
fd6c3a8d JB |
951 | /* Do not reference cpuinit code/data from meminit code/data */ |
952 | { | |
953 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
954 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 955 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 956 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
957 | }, |
958 | /* Do not reference meminit code/data from cpuinit code/data */ | |
959 | { | |
960 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
961 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 962 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 963 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 964 | }, |
eb8f6890 SR |
965 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ |
966 | { | |
4a31a229 | 967 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 968 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 969 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 970 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 971 | }, |
fd6c3a8d JB |
972 | /* Do not reference cpuexit code/data from memexit code/data */ |
973 | { | |
974 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
975 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 976 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 977 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
978 | }, |
979 | /* Do not reference memexit code/data from cpuexit code/data */ | |
980 | { | |
981 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
982 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 983 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 984 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 985 | }, |
10668220 SR |
986 | /* Do not use exit code/data from init code */ |
987 | { | |
eb8f6890 SR |
988 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
989 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 990 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 991 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
992 | }, |
993 | /* Do not use init code/data from exit code */ | |
994 | { | |
eb8f6890 | 995 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 996 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 997 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 998 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
999 | }, |
1000 | /* Do not export init/exit functions or data */ | |
1001 | { | |
1002 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1003 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1004 | .mismatch = EXPORT_TO_INIT_EXIT, |
1005 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1006 | } |
1007 | }; | |
1008 | ||
0d2a636e UKK |
1009 | static const struct sectioncheck *section_mismatch( |
1010 | const char *fromsec, const char *tosec) | |
10668220 SR |
1011 | { |
1012 | int i; | |
1013 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1014 | const struct sectioncheck *check = §ioncheck[0]; | |
1015 | ||
1016 | for (i = 0; i < elems; i++) { | |
1017 | if (match(fromsec, check->fromsec) && | |
1018 | match(tosec, check->tosec)) | |
0d2a636e | 1019 | return check; |
10668220 SR |
1020 | check++; |
1021 | } | |
0d2a636e | 1022 | return NULL; |
10668220 SR |
1023 | } |
1024 | ||
4c8fbca5 SR |
1025 | /** |
1026 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1027 | * |
4c8fbca5 SR |
1028 | * Pattern 1: |
1029 | * If a module parameter is declared __initdata and permissions=0 | |
1030 | * then this is legal despite the warning generated. | |
1031 | * We cannot see value of permissions here, so just ignore | |
1032 | * this pattern. | |
1033 | * The pattern is identified by: | |
1034 | * tosec = .init.data | |
9209aed0 | 1035 | * fromsec = .data* |
4c8fbca5 | 1036 | * atsym =__param* |
62070fa4 | 1037 | * |
6a841528 RR |
1038 | * Pattern 1a: |
1039 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1040 | * The pattern is identified by: | |
1041 | * tosec = .init.text | |
1042 | * fromsec = .data* | |
1043 | * atsym = __param_ops_* | |
1044 | * | |
4c8fbca5 | 1045 | * Pattern 2: |
72ee59b5 | 1046 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1047 | * add, remove, probe functions etc. |
b75dcabd | 1048 | * These functions may often be marked __devinit and we do not want to |
4c8fbca5 SR |
1049 | * warn here. |
1050 | * the pattern is identified by: | |
83cda2bb SR |
1051 | * tosec = init or exit section |
1052 | * fromsec = data section | |
df578e7d SR |
1053 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1054 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1055 | * |
1056 | * Pattern 3: | |
c993971f | 1057 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1058 | * |
1d8af559 | 1059 | * Pattern 4: |
ee6a8545 VG |
1060 | * Some symbols belong to init section but still it is ok to reference |
1061 | * these from non-init sections as these symbols don't have any memory | |
1062 | * allocated for them and symbol address and value are same. So even | |
1063 | * if init section is freed, its ok to reference those symbols. | |
1064 | * For ex. symbols marking the init section boundaries. | |
1065 | * This pattern is identified by | |
1066 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1067 | * |
4c8fbca5 | 1068 | **/ |
af92a82d UKK |
1069 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1070 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1071 | const char *tosec, const char *tosym) |
4c8fbca5 | 1072 | { |
4c8fbca5 | 1073 | /* Check for pattern 1 */ |
6c5bd235 SR |
1074 | if (match(tosec, init_data_sections) && |
1075 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1076 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1077 | return 0; | |
4c8fbca5 | 1078 | |
6a841528 RR |
1079 | /* Check for pattern 1a */ |
1080 | if (strcmp(tosec, ".init.text") == 0 && | |
1081 | match(fromsec, data_sections) && | |
1082 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1083 | return 0; | |
1084 | ||
4c8fbca5 | 1085 | /* Check for pattern 2 */ |
6c5bd235 SR |
1086 | if (match(tosec, init_exit_sections) && |
1087 | match(fromsec, data_sections) && | |
af92a82d | 1088 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1089 | return 0; |
4c8fbca5 | 1090 | |
9bf8cb9b | 1091 | /* Check for pattern 3 */ |
6c5bd235 SR |
1092 | if (match(fromsec, head_sections) && |
1093 | match(tosec, init_sections)) | |
58fb0d4f | 1094 | return 0; |
9bf8cb9b | 1095 | |
1d8af559 | 1096 | /* Check for pattern 4 */ |
58fb0d4f SR |
1097 | if (match(tosym, linker_symbols)) |
1098 | return 0; | |
9bf8cb9b | 1099 | |
58fb0d4f | 1100 | return 1; |
4c8fbca5 SR |
1101 | } |
1102 | ||
93684d3b SR |
1103 | /** |
1104 | * Find symbol based on relocation record info. | |
1105 | * In some cases the symbol supplied is a valid symbol so | |
1106 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1107 | * In other cases the symbol needs to be looked up in the symbol table | |
1108 | * based on section and address. | |
1109 | * **/ | |
9ad21c3f | 1110 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1111 | Elf_Sym *relsym) |
1112 | { | |
1113 | Elf_Sym *sym; | |
9ad21c3f SR |
1114 | Elf_Sym *near = NULL; |
1115 | Elf64_Sword distance = 20; | |
1116 | Elf64_Sword d; | |
1ce53adf | 1117 | unsigned int relsym_secindex; |
93684d3b SR |
1118 | |
1119 | if (relsym->st_name != 0) | |
1120 | return relsym; | |
1ce53adf DV |
1121 | |
1122 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1123 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1124 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1125 | continue; |
ae4ac123 AN |
1126 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1127 | continue; | |
93684d3b SR |
1128 | if (sym->st_value == addr) |
1129 | return sym; | |
9ad21c3f SR |
1130 | /* Find a symbol nearby - addr are maybe negative */ |
1131 | d = sym->st_value - addr; | |
1132 | if (d < 0) | |
1133 | d = addr - sym->st_value; | |
1134 | if (d < distance) { | |
1135 | distance = d; | |
1136 | near = sym; | |
1137 | } | |
93684d3b | 1138 | } |
9ad21c3f SR |
1139 | /* We need a close match */ |
1140 | if (distance < 20) | |
1141 | return near; | |
1142 | else | |
1143 | return NULL; | |
93684d3b SR |
1144 | } |
1145 | ||
da68d61f DB |
1146 | static inline int is_arm_mapping_symbol(const char *str) |
1147 | { | |
1148 | return str[0] == '$' && strchr("atd", str[1]) | |
1149 | && (str[2] == '\0' || str[2] == '.'); | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1154 | * one of the magic symbols emitted used by current ARM tools. | |
1155 | * | |
1156 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1157 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1158 | * only by merging __exit and __init sections into __text, bloating | |
1159 | * the kernel (which is especially evil on embedded platforms). | |
1160 | */ | |
1161 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1162 | { | |
1163 | const char *name = elf->strtab + sym->st_name; | |
1164 | ||
1165 | if (!name || !strlen(name)) | |
1166 | return 0; | |
1167 | return !is_arm_mapping_symbol(name); | |
1168 | } | |
1169 | ||
b39927cf | 1170 | /* |
43c74d17 SR |
1171 | * Find symbols before or equal addr and after addr - in the section sec. |
1172 | * If we find two symbols with equal offset prefer one with a valid name. | |
1173 | * The ELF format may have a better way to detect what type of symbol | |
1174 | * it is, but this works for now. | |
b39927cf | 1175 | **/ |
157c23c8 SR |
1176 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1177 | const char *sec) | |
b39927cf SR |
1178 | { |
1179 | Elf_Sym *sym; | |
157c23c8 | 1180 | Elf_Sym *near = NULL; |
157c23c8 | 1181 | Elf_Addr distance = ~0; |
62070fa4 | 1182 | |
b39927cf SR |
1183 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1184 | const char *symsec; | |
1185 | ||
1ce53adf | 1186 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1187 | continue; |
1ce53adf | 1188 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1189 | if (strcmp(symsec, sec) != 0) |
1190 | continue; | |
da68d61f DB |
1191 | if (!is_valid_name(elf, sym)) |
1192 | continue; | |
b39927cf | 1193 | if (sym->st_value <= addr) { |
157c23c8 SR |
1194 | if ((addr - sym->st_value) < distance) { |
1195 | distance = addr - sym->st_value; | |
1196 | near = sym; | |
1197 | } else if ((addr - sym->st_value) == distance) { | |
1198 | near = sym; | |
43c74d17 | 1199 | } |
b39927cf SR |
1200 | } |
1201 | } | |
157c23c8 | 1202 | return near; |
b39927cf SR |
1203 | } |
1204 | ||
588ccd73 SR |
1205 | /* |
1206 | * Convert a section name to the function/data attribute | |
1207 | * .init.text => __init | |
1208 | * .cpuinit.data => __cpudata | |
1209 | * .memexitconst => __memconst | |
1210 | * etc. | |
1211 | */ | |
1212 | static char *sec2annotation(const char *s) | |
1213 | { | |
1214 | if (match(s, init_exit_sections)) { | |
1215 | char *p = malloc(20); | |
1216 | char *r = p; | |
1217 | ||
1218 | *p++ = '_'; | |
1219 | *p++ = '_'; | |
1220 | if (*s == '.') | |
1221 | s++; | |
1222 | while (*s && *s != '.') | |
1223 | *p++ = *s++; | |
1224 | *p = '\0'; | |
1225 | if (*s == '.') | |
1226 | s++; | |
1227 | if (strstr(s, "rodata") != NULL) | |
1228 | strcat(p, "const "); | |
1229 | else if (strstr(s, "data") != NULL) | |
1230 | strcat(p, "data "); | |
1231 | else | |
1232 | strcat(p, " "); | |
1233 | return r; /* we leak her but we do not care */ | |
1234 | } else { | |
5003bab8 | 1235 | return strdup(""); |
588ccd73 SR |
1236 | } |
1237 | } | |
1238 | ||
1239 | static int is_function(Elf_Sym *sym) | |
1240 | { | |
1241 | if (sym) | |
1242 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1243 | else | |
f666751a | 1244 | return -1; |
588ccd73 SR |
1245 | } |
1246 | ||
58fb0d4f | 1247 | /* |
b39927cf SR |
1248 | * Print a warning about a section mismatch. |
1249 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1250 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1251 | */ |
0d2a636e UKK |
1252 | static void report_sec_mismatch(const char *modname, |
1253 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1254 | const char *fromsec, |
1255 | unsigned long long fromaddr, | |
1256 | const char *fromsym, | |
588ccd73 SR |
1257 | int from_is_func, |
1258 | const char *tosec, const char *tosym, | |
1259 | int to_is_func) | |
1260 | { | |
1261 | const char *from, *from_p; | |
1262 | const char *to, *to_p; | |
37ed19d5 AF |
1263 | char *prl_from; |
1264 | char *prl_to; | |
f666751a SR |
1265 | |
1266 | switch (from_is_func) { | |
1267 | case 0: from = "variable"; from_p = ""; break; | |
1268 | case 1: from = "function"; from_p = "()"; break; | |
1269 | default: from = "(unknown reference)"; from_p = ""; break; | |
1270 | } | |
1271 | switch (to_is_func) { | |
1272 | case 0: to = "variable"; to_p = ""; break; | |
1273 | case 1: to = "function"; to_p = "()"; break; | |
1274 | default: to = "(unknown reference)"; to_p = ""; break; | |
1275 | } | |
588ccd73 | 1276 | |
e5f95c8b SR |
1277 | sec_mismatch_count++; |
1278 | if (!sec_mismatch_verbose) | |
1279 | return; | |
1280 | ||
7c0ac495 GU |
1281 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1282 | "to the %s %s:%s%s\n", | |
1283 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1284 | tosym, to_p); | |
588ccd73 | 1285 | |
0d2a636e | 1286 | switch (mismatch->mismatch) { |
bbd3f4fb | 1287 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1288 | prl_from = sec2annotation(fromsec); |
1289 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1290 | fprintf(stderr, |
f666751a | 1291 | "The function %s%s() references\n" |
588ccd73 SR |
1292 | "the %s %s%s%s.\n" |
1293 | "This is often because %s lacks a %s\n" | |
1294 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1295 | prl_from, fromsym, |
1296 | to, prl_to, tosym, to_p, | |
1297 | fromsym, prl_to, tosym); | |
1298 | free(prl_from); | |
1299 | free(prl_to); | |
588ccd73 | 1300 | break; |
bbd3f4fb | 1301 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1302 | prl_to = sec2annotation(tosec); |
af92a82d | 1303 | const char *const *s = mismatch->symbol_white_list; |
588ccd73 SR |
1304 | fprintf(stderr, |
1305 | "The variable %s references\n" | |
1306 | "the %s %s%s%s\n" | |
1307 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1308 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1309 | "or name the variable:\n", |
37ed19d5 | 1310 | fromsym, to, prl_to, tosym, to_p); |
588ccd73 SR |
1311 | while (*s) |
1312 | fprintf(stderr, "%s, ", *s++); | |
1313 | fprintf(stderr, "\n"); | |
37ed19d5 | 1314 | free(prl_to); |
588ccd73 | 1315 | break; |
58fb0d4f | 1316 | } |
bbd3f4fb | 1317 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1318 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1319 | fprintf(stderr, |
1320 | "The function %s() references a %s in an exit section.\n" | |
1321 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1322 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1323 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1324 | free(prl_to); | |
588ccd73 | 1325 | break; |
bbd3f4fb | 1326 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1327 | prl_to = sec2annotation(tosec); |
af92a82d | 1328 | const char *const *s = mismatch->symbol_white_list; |
588ccd73 SR |
1329 | fprintf(stderr, |
1330 | "The variable %s references\n" | |
1331 | "the %s %s%s%s\n" | |
1332 | "If the reference is valid then annotate the\n" | |
1333 | "variable with __exit* (see linux/init.h) or " | |
1334 | "name the variable:\n", | |
37ed19d5 | 1335 | fromsym, to, prl_to, tosym, to_p); |
588ccd73 SR |
1336 | while (*s) |
1337 | fprintf(stderr, "%s, ", *s++); | |
1338 | fprintf(stderr, "\n"); | |
37ed19d5 | 1339 | free(prl_to); |
588ccd73 SR |
1340 | break; |
1341 | } | |
bbd3f4fb UKK |
1342 | case XXXINIT_TO_SOME_INIT: |
1343 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1344 | prl_from = sec2annotation(fromsec); |
1345 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1346 | fprintf(stderr, |
1347 | "The %s %s%s%s references\n" | |
1348 | "a %s %s%s%s.\n" | |
1349 | "If %s is only used by %s then\n" | |
1350 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1351 | from, prl_from, fromsym, from_p, |
1352 | to, prl_to, tosym, to_p, | |
b1d2675a | 1353 | tosym, fromsym, tosym); |
37ed19d5 AF |
1354 | free(prl_from); |
1355 | free(prl_to); | |
588ccd73 | 1356 | break; |
bbd3f4fb | 1357 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1358 | prl_from = sec2annotation(fromsec); |
1359 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1360 | fprintf(stderr, |
1361 | "The %s %s%s%s references\n" | |
1362 | "a %s %s%s%s.\n" | |
1363 | "This is often seen when error handling " | |
1364 | "in the init function\n" | |
1365 | "uses functionality in the exit path.\n" | |
1366 | "The fix is often to remove the %sannotation of\n" | |
1367 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1368 | from, prl_from, fromsym, from_p, |
1369 | to, prl_to, tosym, to_p, | |
5003bab8 | 1370 | prl_to, tosym, to_p); |
37ed19d5 AF |
1371 | free(prl_from); |
1372 | free(prl_to); | |
588ccd73 | 1373 | break; |
bbd3f4fb | 1374 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1375 | prl_from = sec2annotation(fromsec); |
1376 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1377 | fprintf(stderr, |
1378 | "The %s %s%s%s references\n" | |
1379 | "a %s %s%s%s.\n" | |
1380 | "This is often seen when error handling " | |
1381 | "in the exit function\n" | |
1382 | "uses functionality in the init path.\n" | |
1383 | "The fix is often to remove the %sannotation of\n" | |
1384 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1385 | from, prl_from, fromsym, from_p, |
1386 | to, prl_to, tosym, to_p, | |
1387 | prl_to, tosym, to_p); | |
1388 | free(prl_from); | |
1389 | free(prl_to); | |
588ccd73 SR |
1390 | break; |
1391 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1392 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1393 | fprintf(stderr, |
1394 | "The symbol %s is exported and annotated %s\n" | |
1395 | "Fix this by removing the %sannotation of %s " | |
1396 | "or drop the export.\n", | |
37ed19d5 AF |
1397 | tosym, prl_to, prl_to, tosym); |
1398 | free(prl_to); | |
588ccd73 SR |
1399 | break; |
1400 | } | |
1401 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1402 | } |
1403 | ||
1404 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1405 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1406 | { | |
1407 | const char *tosec; | |
0d2a636e | 1408 | const struct sectioncheck *mismatch; |
58fb0d4f | 1409 | |
1ce53adf | 1410 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1411 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1412 | if (mismatch) { |
588ccd73 SR |
1413 | Elf_Sym *to; |
1414 | Elf_Sym *from; | |
58fb0d4f | 1415 | const char *tosym; |
588ccd73 | 1416 | const char *fromsym; |
58fb0d4f | 1417 | |
588ccd73 SR |
1418 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1419 | fromsym = sym_name(elf, from); | |
1420 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1421 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1422 | |
1423 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1424 | if (secref_whitelist(mismatch, |
1425 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1426 | report_sec_mismatch(modname, mismatch, |
1427 | fromsec, r->r_offset, fromsym, | |
1428 | is_function(from), tosec, tosym, | |
1429 | is_function(to)); | |
58fb0d4f | 1430 | } |
b39927cf SR |
1431 | } |
1432 | } | |
1433 | ||
ae4ac123 | 1434 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1435 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1436 | { |
1437 | Elf_Shdr *sechdrs = elf->sechdrs; | |
1ce53adf | 1438 | int section = shndx2secindex(sechdr->sh_info); |
ae4ac123 AN |
1439 | |
1440 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
1c938663 | 1441 | r->r_offset - sechdrs[section].sh_addr; |
ae4ac123 AN |
1442 | } |
1443 | ||
5b24c071 | 1444 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1445 | { |
1446 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1447 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1448 | |
1449 | switch (r_typ) { | |
1450 | case R_386_32: | |
1451 | r->r_addend = TO_NATIVE(*location); | |
1452 | break; | |
1453 | case R_386_PC32: | |
1454 | r->r_addend = TO_NATIVE(*location) + 4; | |
1455 | /* For CONFIG_RELOCATABLE=y */ | |
1456 | if (elf->hdr->e_type == ET_EXEC) | |
1457 | r->r_addend += r->r_offset; | |
1458 | break; | |
1459 | } | |
1460 | return 0; | |
1461 | } | |
1462 | ||
5b24c071 | 1463 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1464 | { |
1465 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1466 | ||
1467 | switch (r_typ) { | |
1468 | case R_ARM_ABS32: | |
1469 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1470 | r->r_addend = (int)(long) |
1471 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1472 | break; |
1473 | case R_ARM_PC24: | |
1474 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1475 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1476 | sechdr->sh_offset + |
1477 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1478 | break; |
1479 | default: | |
1480 | return 1; | |
1481 | } | |
1482 | return 0; | |
1483 | } | |
1484 | ||
5b24c071 | 1485 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1486 | { |
1487 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1488 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1489 | unsigned int inst; |
1490 | ||
1491 | if (r_typ == R_MIPS_HI16) | |
1492 | return 1; /* skip this */ | |
1493 | inst = TO_NATIVE(*location); | |
1494 | switch (r_typ) { | |
1495 | case R_MIPS_LO16: | |
1496 | r->r_addend = inst & 0xffff; | |
1497 | break; | |
1498 | case R_MIPS_26: | |
1499 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1500 | break; | |
1501 | case R_MIPS_32: | |
1502 | r->r_addend = inst; | |
1503 | break; | |
1504 | } | |
1505 | return 0; | |
1506 | } | |
1507 | ||
5b24c071 | 1508 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1509 | Elf_Shdr *sechdr) |
5b24c071 SR |
1510 | { |
1511 | Elf_Sym *sym; | |
1512 | Elf_Rela *rela; | |
1513 | Elf_Rela r; | |
1514 | unsigned int r_sym; | |
1515 | const char *fromsec; | |
5b24c071 | 1516 | |
ff13f926 | 1517 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1518 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1519 | ||
ff13f926 | 1520 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1521 | fromsec += strlen(".rela"); |
1522 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1523 | if (match(fromsec, section_white_list)) |
5b24c071 | 1524 | return; |
e241a630 | 1525 | |
5b24c071 SR |
1526 | for (rela = start; rela < stop; rela++) { |
1527 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1528 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1529 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1530 | unsigned int r_typ; |
1531 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1532 | r_sym = TO_NATIVE(r_sym); | |
1533 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1534 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1535 | } else { | |
1536 | r.r_info = TO_NATIVE(rela->r_info); | |
1537 | r_sym = ELF_R_SYM(r.r_info); | |
1538 | } | |
1539 | #else | |
1540 | r.r_info = TO_NATIVE(rela->r_info); | |
1541 | r_sym = ELF_R_SYM(r.r_info); | |
1542 | #endif | |
1543 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1544 | sym = elf->symtab_start + r_sym; | |
1545 | /* Skip special sections */ | |
1ce53adf | 1546 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1547 | continue; |
58fb0d4f | 1548 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1549 | } |
1550 | } | |
1551 | ||
1552 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1553 | Elf_Shdr *sechdr) |
5b24c071 SR |
1554 | { |
1555 | Elf_Sym *sym; | |
1556 | Elf_Rel *rel; | |
1557 | Elf_Rela r; | |
1558 | unsigned int r_sym; | |
1559 | const char *fromsec; | |
5b24c071 | 1560 | |
ff13f926 | 1561 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1562 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1563 | ||
ff13f926 | 1564 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1565 | fromsec += strlen(".rel"); |
1566 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1567 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1568 | return; |
1569 | ||
1570 | for (rel = start; rel < stop; rel++) { | |
1571 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1572 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1573 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1574 | unsigned int r_typ; |
1575 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1576 | r_sym = TO_NATIVE(r_sym); | |
1577 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1578 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1579 | } else { | |
1580 | r.r_info = TO_NATIVE(rel->r_info); | |
1581 | r_sym = ELF_R_SYM(r.r_info); | |
1582 | } | |
1583 | #else | |
1584 | r.r_info = TO_NATIVE(rel->r_info); | |
1585 | r_sym = ELF_R_SYM(r.r_info); | |
1586 | #endif | |
1587 | r.r_addend = 0; | |
ff13f926 | 1588 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1589 | case EM_386: |
1590 | if (addend_386_rel(elf, sechdr, &r)) | |
1591 | continue; | |
1592 | break; | |
1593 | case EM_ARM: | |
1594 | if (addend_arm_rel(elf, sechdr, &r)) | |
1595 | continue; | |
1596 | break; | |
1597 | case EM_MIPS: | |
1598 | if (addend_mips_rel(elf, sechdr, &r)) | |
1599 | continue; | |
1600 | break; | |
1601 | } | |
1602 | sym = elf->symtab_start + r_sym; | |
1603 | /* Skip special sections */ | |
1ce53adf | 1604 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1605 | continue; |
58fb0d4f | 1606 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1607 | } |
1608 | } | |
1609 | ||
b39927cf SR |
1610 | /** |
1611 | * A module includes a number of sections that are discarded | |
1612 | * either when loaded or when used as built-in. | |
1613 | * For loaded modules all functions marked __init and all data | |
1614 | * marked __initdata will be discarded when the module has been intialized. | |
1615 | * Likewise for modules used built-in the sections marked __exit | |
1616 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1617 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1618 | * The check_sec_ref() function traverses all relocation records |
1619 | * to find all references to a section that reference a section that will | |
1620 | * be discarded and warns about it. | |
1621 | **/ | |
1622 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1623 | struct elf_info *elf) |
b39927cf SR |
1624 | { |
1625 | int i; | |
b39927cf | 1626 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1627 | |
b39927cf | 1628 | /* Walk through all sections */ |
1ce53adf | 1629 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1630 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1631 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1632 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1633 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1634 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1635 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1636 | } |
1637 | } | |
1638 | ||
5c3ead8c | 1639 | static void read_symbols(char *modname) |
1da177e4 LT |
1640 | { |
1641 | const char *symname; | |
1642 | char *version; | |
b817f6fe | 1643 | char *license; |
1da177e4 LT |
1644 | struct module *mod; |
1645 | struct elf_info info = { }; | |
1646 | Elf_Sym *sym; | |
1647 | ||
85bd2fdd SR |
1648 | if (!parse_elf(&info, modname)) |
1649 | return; | |
1da177e4 LT |
1650 | |
1651 | mod = new_module(modname); | |
1652 | ||
1653 | /* When there's no vmlinux, don't print warnings about | |
1654 | * unresolved symbols (since there'll be too many ;) */ | |
1655 | if (is_vmlinux(modname)) { | |
1da177e4 | 1656 | have_vmlinux = 1; |
1da177e4 LT |
1657 | mod->skip = 1; |
1658 | } | |
1659 | ||
b817f6fe | 1660 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1661 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1662 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1663 | "see include/linux/module.h for " | |
1664 | "more information\n", modname); | |
b817f6fe SR |
1665 | while (license) { |
1666 | if (license_is_gpl_compatible(license)) | |
1667 | mod->gpl_compatible = 1; | |
1668 | else { | |
1669 | mod->gpl_compatible = 0; | |
1670 | break; | |
1671 | } | |
1672 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1673 | "license", license); | |
1674 | } | |
1675 | ||
1da177e4 LT |
1676 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1677 | symname = info.strtab + sym->st_name; | |
1678 | ||
1679 | handle_modversions(mod, &info, sym, symname); | |
1680 | handle_moddevtable(mod, &info, sym, symname); | |
1681 | } | |
d1f25e66 | 1682 | if (!is_vmlinux(modname) || |
10668220 SR |
1683 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1684 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1685 | |
1686 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1687 | if (version) | |
1688 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1689 | version - (char *)info.hdr); | |
1690 | if (version || (all_versions && !is_vmlinux(modname))) | |
1691 | get_src_version(modname, mod->srcversion, | |
1692 | sizeof(mod->srcversion)-1); | |
1693 | ||
1694 | parse_elf_finish(&info); | |
1695 | ||
8c8ef42a | 1696 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1697 | * never passed as an argument to an exported function, so |
1698 | * the automatic versioning doesn't pick it up, but it's really | |
1699 | * important anyhow */ | |
1700 | if (modversions) | |
8c8ef42a | 1701 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | #define SZ 500 | |
1705 | ||
1706 | /* We first write the generated file into memory using the | |
1707 | * following helper, then compare to the file on disk and | |
1708 | * only update the later if anything changed */ | |
1709 | ||
5c3ead8c SR |
1710 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1711 | const char *fmt, ...) | |
1da177e4 LT |
1712 | { |
1713 | char tmp[SZ]; | |
1714 | int len; | |
1715 | va_list ap; | |
62070fa4 | 1716 | |
1da177e4 LT |
1717 | va_start(ap, fmt); |
1718 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1719 | buf_write(buf, tmp, len); |
1da177e4 LT |
1720 | va_end(ap); |
1721 | } | |
1722 | ||
5c3ead8c | 1723 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1724 | { |
1725 | if (buf->size - buf->pos < len) { | |
7670f023 | 1726 | buf->size += len + SZ; |
1da177e4 LT |
1727 | buf->p = realloc(buf->p, buf->size); |
1728 | } | |
1729 | strncpy(buf->p + buf->pos, s, len); | |
1730 | buf->pos += len; | |
1731 | } | |
1732 | ||
c96fca21 SR |
1733 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1734 | { | |
1735 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1736 | ||
1737 | switch (exp) { | |
1738 | case export_gpl: | |
1739 | fatal("modpost: GPL-incompatible module %s%s " | |
1740 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1741 | break; | |
1742 | case export_unused_gpl: | |
1743 | fatal("modpost: GPL-incompatible module %s%s " | |
1744 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1745 | break; | |
1746 | case export_gpl_future: | |
1747 | warn("modpost: GPL-incompatible module %s%s " | |
1748 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1749 | break; | |
1750 | case export_plain: | |
1751 | case export_unused: | |
1752 | case export_unknown: | |
1753 | /* ignore */ | |
1754 | break; | |
1755 | } | |
1756 | } | |
1757 | ||
df578e7d | 1758 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1759 | { |
1760 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1761 | ||
1762 | switch (exp) { | |
1763 | case export_unused: | |
1764 | case export_unused_gpl: | |
1765 | warn("modpost: module %s%s " | |
1766 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1767 | break; | |
1768 | default: | |
1769 | /* ignore */ | |
1770 | break; | |
1771 | } | |
1772 | } | |
1773 | ||
1774 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1775 | { |
1776 | struct symbol *s, *exp; | |
1777 | ||
1778 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1779 | const char *basename; |
b817f6fe SR |
1780 | exp = find_symbol(s->name); |
1781 | if (!exp || exp->module == mod) | |
1782 | continue; | |
6449bd62 | 1783 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1784 | if (basename) |
1785 | basename++; | |
c96fca21 SR |
1786 | else |
1787 | basename = mod->name; | |
1788 | if (!mod->gpl_compatible) | |
1789 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1790 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1791 | } |
b817f6fe SR |
1792 | } |
1793 | ||
5c3ead8c SR |
1794 | /** |
1795 | * Header for the generated file | |
1796 | **/ | |
1797 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1798 | { |
1799 | buf_printf(b, "#include <linux/module.h>\n"); | |
1800 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1801 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1802 | buf_printf(b, "\n"); | |
1803 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1804 | buf_printf(b, "\n"); | |
1da177e4 LT |
1805 | buf_printf(b, "struct module __this_module\n"); |
1806 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1807 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1808 | if (mod->has_init) |
1809 | buf_printf(b, " .init = init_module,\n"); | |
1810 | if (mod->has_cleanup) | |
1811 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1812 | " .exit = cleanup_module,\n" | |
1813 | "#endif\n"); | |
e61a1c1c | 1814 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1815 | buf_printf(b, "};\n"); |
1816 | } | |
1817 | ||
5c725138 | 1818 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1819 | { |
1820 | static const char *staging_dir = "drivers/staging"; | |
1821 | ||
1822 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1823 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1824 | } | |
1825 | ||
5c3ead8c SR |
1826 | /** |
1827 | * Record CRCs for unresolved symbols | |
1828 | **/ | |
c53ddacd | 1829 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1830 | { |
1831 | struct symbol *s, *exp; | |
c53ddacd | 1832 | int err = 0; |
1da177e4 LT |
1833 | |
1834 | for (s = mod->unres; s; s = s->next) { | |
1835 | exp = find_symbol(s->name); | |
1836 | if (!exp || exp->module == mod) { | |
c53ddacd | 1837 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1838 | if (warn_unresolved) { |
1839 | warn("\"%s\" [%s.ko] undefined!\n", | |
1840 | s->name, mod->name); | |
1841 | } else { | |
1842 | merror("\"%s\" [%s.ko] undefined!\n", | |
1843 | s->name, mod->name); | |
1844 | err = 1; | |
1845 | } | |
c53ddacd | 1846 | } |
1da177e4 LT |
1847 | continue; |
1848 | } | |
1849 | s->module = exp->module; | |
1850 | s->crc_valid = exp->crc_valid; | |
1851 | s->crc = exp->crc; | |
1852 | } | |
1853 | ||
1854 | if (!modversions) | |
c53ddacd | 1855 | return err; |
1da177e4 LT |
1856 | |
1857 | buf_printf(b, "\n"); | |
1858 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1859 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1860 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1861 | ||
1862 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1863 | if (!s->module) |
1da177e4 | 1864 | continue; |
1da177e4 | 1865 | if (!s->crc_valid) { |
cb80514d | 1866 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1867 | s->name, mod->name); |
1868 | continue; | |
1869 | } | |
1870 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1871 | } | |
1872 | ||
1873 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1874 | |
1875 | return err; | |
1da177e4 LT |
1876 | } |
1877 | ||
5c3ead8c SR |
1878 | static void add_depends(struct buffer *b, struct module *mod, |
1879 | struct module *modules) | |
1da177e4 LT |
1880 | { |
1881 | struct symbol *s; | |
1882 | struct module *m; | |
1883 | int first = 1; | |
1884 | ||
df578e7d | 1885 | for (m = modules; m; m = m->next) |
1da177e4 | 1886 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1887 | |
1888 | buf_printf(b, "\n"); | |
1889 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1890 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1891 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1892 | buf_printf(b, "\"depends="); | |
1893 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1894 | const char *p; |
1da177e4 LT |
1895 | if (!s->module) |
1896 | continue; | |
1897 | ||
1898 | if (s->module->seen) | |
1899 | continue; | |
1900 | ||
1901 | s->module->seen = 1; | |
df578e7d SR |
1902 | p = strrchr(s->module->name, '/'); |
1903 | if (p) | |
a61b2dfd SR |
1904 | p++; |
1905 | else | |
1906 | p = s->module->name; | |
1907 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1908 | first = 0; |
1909 | } | |
1910 | buf_printf(b, "\";\n"); | |
1911 | } | |
1912 | ||
5c3ead8c | 1913 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1914 | { |
1915 | if (mod->srcversion[0]) { | |
1916 | buf_printf(b, "\n"); | |
1917 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1918 | mod->srcversion); | |
1919 | } | |
1920 | } | |
1921 | ||
5c3ead8c | 1922 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1923 | { |
1924 | char *tmp; | |
1925 | FILE *file; | |
1926 | struct stat st; | |
1927 | ||
1928 | file = fopen(fname, "r"); | |
1929 | if (!file) | |
1930 | goto write; | |
1931 | ||
1932 | if (fstat(fileno(file), &st) < 0) | |
1933 | goto close_write; | |
1934 | ||
1935 | if (st.st_size != b->pos) | |
1936 | goto close_write; | |
1937 | ||
1938 | tmp = NOFAIL(malloc(b->pos)); | |
1939 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1940 | goto free_write; | |
1941 | ||
1942 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1943 | goto free_write; | |
1944 | ||
1945 | free(tmp); | |
1946 | fclose(file); | |
1947 | return; | |
1948 | ||
1949 | free_write: | |
1950 | free(tmp); | |
1951 | close_write: | |
1952 | fclose(file); | |
1953 | write: | |
1954 | file = fopen(fname, "w"); | |
1955 | if (!file) { | |
1956 | perror(fname); | |
1957 | exit(1); | |
1958 | } | |
1959 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1960 | perror(fname); | |
1961 | exit(1); | |
1962 | } | |
1963 | fclose(file); | |
1964 | } | |
1965 | ||
bd5cbced | 1966 | /* parse Module.symvers file. line format: |
534b89a9 | 1967 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1968 | **/ |
040fcc81 | 1969 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1970 | { |
1971 | unsigned long size, pos = 0; | |
1972 | void *file = grab_file(fname, &size); | |
1973 | char *line; | |
1974 | ||
df578e7d | 1975 | if (!file) |
1da177e4 LT |
1976 | /* No symbol versions, silently ignore */ |
1977 | return; | |
1978 | ||
1979 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1980 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1981 | unsigned int crc; |
1982 | struct module *mod; | |
040fcc81 | 1983 | struct symbol *s; |
1da177e4 LT |
1984 | |
1985 | if (!(symname = strchr(line, '\t'))) | |
1986 | goto fail; | |
1987 | *symname++ = '\0'; | |
1988 | if (!(modname = strchr(symname, '\t'))) | |
1989 | goto fail; | |
1990 | *modname++ = '\0'; | |
9ac545b0 | 1991 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1992 | *export++ = '\0'; |
534b89a9 SR |
1993 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1994 | *end = '\0'; | |
1da177e4 LT |
1995 | crc = strtoul(line, &d, 16); |
1996 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1997 | goto fail; | |
df578e7d SR |
1998 | mod = find_module(modname); |
1999 | if (!mod) { | |
2000 | if (is_vmlinux(modname)) | |
1da177e4 | 2001 | have_vmlinux = 1; |
0fa3a88c | 2002 | mod = new_module(modname); |
1da177e4 LT |
2003 | mod->skip = 1; |
2004 | } | |
bd5cbced | 2005 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2006 | s->kernel = kernel; |
2007 | s->preloaded = 1; | |
bd5cbced | 2008 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2009 | } |
2010 | return; | |
2011 | fail: | |
2012 | fatal("parse error in symbol dump file\n"); | |
2013 | } | |
2014 | ||
040fcc81 SR |
2015 | /* For normal builds always dump all symbols. |
2016 | * For external modules only dump symbols | |
2017 | * that are not read from kernel Module.symvers. | |
2018 | **/ | |
2019 | static int dump_sym(struct symbol *sym) | |
2020 | { | |
2021 | if (!external_module) | |
2022 | return 1; | |
2023 | if (sym->vmlinux || sym->kernel) | |
2024 | return 0; | |
2025 | return 1; | |
2026 | } | |
62070fa4 | 2027 | |
5c3ead8c | 2028 | static void write_dump(const char *fname) |
1da177e4 LT |
2029 | { |
2030 | struct buffer buf = { }; | |
2031 | struct symbol *symbol; | |
2032 | int n; | |
2033 | ||
2034 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2035 | symbol = symbolhash[n]; | |
2036 | while (symbol) { | |
040fcc81 | 2037 | if (dump_sym(symbol)) |
bd5cbced | 2038 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2039 | symbol->crc, symbol->name, |
bd5cbced RP |
2040 | symbol->module->name, |
2041 | export_str(symbol->export)); | |
1da177e4 LT |
2042 | symbol = symbol->next; |
2043 | } | |
2044 | } | |
2045 | write_if_changed(&buf, fname); | |
2046 | } | |
2047 | ||
2d04b5ae RH |
2048 | struct ext_sym_list { |
2049 | struct ext_sym_list *next; | |
2050 | const char *file; | |
2051 | }; | |
2052 | ||
5c3ead8c | 2053 | int main(int argc, char **argv) |
1da177e4 LT |
2054 | { |
2055 | struct module *mod; | |
2056 | struct buffer buf = { }; | |
040fcc81 SR |
2057 | char *kernel_read = NULL, *module_read = NULL; |
2058 | char *dump_write = NULL; | |
1da177e4 | 2059 | int opt; |
c53ddacd | 2060 | int err; |
2d04b5ae RH |
2061 | struct ext_sym_list *extsym_iter; |
2062 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2063 | |
2d04b5ae | 2064 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d SR |
2065 | switch (opt) { |
2066 | case 'i': | |
2067 | kernel_read = optarg; | |
2068 | break; | |
2069 | case 'I': | |
2070 | module_read = optarg; | |
2071 | external_module = 1; | |
2072 | break; | |
4ce6efed SR |
2073 | case 'c': |
2074 | cross_build = 1; | |
2075 | break; | |
2d04b5ae RH |
2076 | case 'e': |
2077 | external_module = 1; | |
2078 | extsym_iter = | |
2079 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2080 | extsym_iter->next = extsym_start; | |
2081 | extsym_iter->file = optarg; | |
2082 | extsym_start = extsym_iter; | |
2083 | break; | |
df578e7d SR |
2084 | case 'm': |
2085 | modversions = 1; | |
2086 | break; | |
2087 | case 'o': | |
2088 | dump_write = optarg; | |
2089 | break; | |
2090 | case 'a': | |
2091 | all_versions = 1; | |
2092 | break; | |
2093 | case 's': | |
2094 | vmlinux_section_warnings = 0; | |
2095 | break; | |
588ccd73 SR |
2096 | case 'S': |
2097 | sec_mismatch_verbose = 0; | |
2098 | break; | |
df578e7d SR |
2099 | case 'w': |
2100 | warn_unresolved = 1; | |
2101 | break; | |
2102 | default: | |
2103 | exit(1); | |
1da177e4 LT |
2104 | } |
2105 | } | |
2106 | ||
040fcc81 SR |
2107 | if (kernel_read) |
2108 | read_dump(kernel_read, 1); | |
2109 | if (module_read) | |
2110 | read_dump(module_read, 0); | |
2d04b5ae RH |
2111 | while (extsym_start) { |
2112 | read_dump(extsym_start->file, 0); | |
2113 | extsym_iter = extsym_start->next; | |
2114 | free(extsym_start); | |
2115 | extsym_start = extsym_iter; | |
2116 | } | |
1da177e4 | 2117 | |
df578e7d | 2118 | while (optind < argc) |
1da177e4 | 2119 | read_symbols(argv[optind++]); |
1da177e4 | 2120 | |
b817f6fe SR |
2121 | for (mod = modules; mod; mod = mod->next) { |
2122 | if (mod->skip) | |
2123 | continue; | |
c96fca21 | 2124 | check_exports(mod); |
b817f6fe SR |
2125 | } |
2126 | ||
c53ddacd KK |
2127 | err = 0; |
2128 | ||
1da177e4 | 2129 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2130 | char fname[strlen(mod->name) + 10]; |
2131 | ||
1da177e4 LT |
2132 | if (mod->skip) |
2133 | continue; | |
2134 | ||
2135 | buf.pos = 0; | |
2136 | ||
2137 | add_header(&buf, mod); | |
a9860bf0 | 2138 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2139 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2140 | add_depends(&buf, mod, modules); |
2141 | add_moddevtable(&buf, mod); | |
2142 | add_srcversion(&buf, mod); | |
2143 | ||
2144 | sprintf(fname, "%s.mod.c", mod->name); | |
2145 | write_if_changed(&buf, fname); | |
2146 | } | |
2147 | ||
2148 | if (dump_write) | |
2149 | write_dump(dump_write); | |
588ccd73 | 2150 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2151 | warn("modpost: Found %d section mismatch(es).\n" |
2152 | "To see full details build your kernel with:\n" | |
2153 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2154 | sec_mismatch_count); | |
1da177e4 | 2155 | |
c53ddacd | 2156 | return err; |
1da177e4 | 2157 | } |