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 | ||
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 | ||
6845756b | 423 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
424 | /* |
425 | * There are more than 64k sections, | |
426 | * read count from .sh_size. | |
1ce53adf DV |
427 | */ |
428 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
429 | } | |
430 | else { | |
431 | info->num_sections = hdr->e_shnum; | |
432 | } | |
433 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 434 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
435 | } |
436 | else { | |
437 | info->secindex_strings = hdr->e_shstrndx; | |
438 | } | |
439 | ||
1da177e4 | 440 | /* Fix endianness in section headers */ |
1ce53adf | 441 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
442 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
443 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
444 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
445 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
446 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
447 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
448 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
449 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
450 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
451 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
452 | } |
453 | /* Find symbol table. */ | |
1ce53adf DV |
454 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
455 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 456 | const char *secname; |
56fc82c5 | 457 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 458 | |
56fc82c5 | 459 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
460 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
461 | "sizeof(*hrd)=%zu\n", filename, | |
462 | (unsigned long)sechdrs[i].sh_offset, | |
463 | sizeof(*hdr)); | |
85bd2fdd SR |
464 | return 0; |
465 | } | |
bd5cbced RP |
466 | secname = secstrings + sechdrs[i].sh_name; |
467 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
468 | if (nobits) |
469 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
470 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
471 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
472 | } else if (strcmp(secname, "__ksymtab") == 0) |
473 | info->export_sec = i; | |
c96fca21 SR |
474 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
475 | info->export_unused_sec = i; | |
bd5cbced RP |
476 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
477 | info->export_gpl_sec = i; | |
c96fca21 SR |
478 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
479 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
480 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
481 | info->export_gpl_future_sec = i; | |
482 | ||
1ce53adf DV |
483 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
484 | unsigned int sh_link_idx; | |
485 | symtab_idx = i; | |
486 | info->symtab_start = (void *)hdr + | |
487 | sechdrs[i].sh_offset; | |
488 | info->symtab_stop = (void *)hdr + | |
489 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 490 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
491 | info->strtab = (void *)hdr + |
492 | sechdrs[sh_link_idx].sh_offset; | |
493 | } | |
1da177e4 | 494 | |
1ce53adf DV |
495 | /* 32bit section no. table? ("more than 64k sections") */ |
496 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
497 | symtab_shndx_idx = i; | |
498 | info->symtab_shndx_start = (void *)hdr + | |
499 | sechdrs[i].sh_offset; | |
500 | info->symtab_shndx_stop = (void *)hdr + | |
501 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
502 | } | |
1da177e4 | 503 | } |
df578e7d | 504 | if (!info->symtab_start) |
cb80514d | 505 | fatal("%s has no symtab?\n", filename); |
df578e7d | 506 | |
1da177e4 LT |
507 | /* Fix endianness in symbols */ |
508 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
509 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
510 | sym->st_name = TO_NATIVE(sym->st_name); | |
511 | sym->st_value = TO_NATIVE(sym->st_value); | |
512 | sym->st_size = TO_NATIVE(sym->st_size); | |
513 | } | |
1ce53adf DV |
514 | |
515 | if (symtab_shndx_idx != ~0U) { | |
516 | Elf32_Word *p; | |
6845756b | 517 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 518 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 519 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
520 | symtab_idx); |
521 | /* Fix endianness */ | |
522 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
523 | p++) | |
524 | *p = TO_NATIVE(*p); | |
525 | } | |
526 | ||
85bd2fdd | 527 | return 1; |
1da177e4 LT |
528 | } |
529 | ||
5c3ead8c | 530 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
531 | { |
532 | release_file(info->hdr, info->size); | |
533 | } | |
534 | ||
4d7365d6 SR |
535 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
536 | { | |
537 | /* ignore __this_module, it will be resolved shortly */ | |
538 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
539 | return 1; | |
540 | /* ignore global offset table */ | |
541 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
542 | return 1; | |
543 | if (info->hdr->e_machine == EM_PPC) | |
544 | /* Special register function linked on all modules during final link of .ko */ | |
545 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
546 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
547 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
548 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
549 | return 1; | |
7fca5dc8 SR |
550 | if (info->hdr->e_machine == EM_PPC64) |
551 | /* Special register function linked on all modules during final link of .ko */ | |
552 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
553 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) | |
554 | return 1; | |
4d7365d6 SR |
555 | /* Do not ignore this symbol */ |
556 | return 0; | |
557 | } | |
558 | ||
f7b05e64 LY |
559 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
560 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 561 | |
5c3ead8c SR |
562 | static void handle_modversions(struct module *mod, struct elf_info *info, |
563 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
564 | { |
565 | unsigned int crc; | |
1ce53adf | 566 | enum export export = export_from_sec(info, get_secindex(info, sym)); |
1da177e4 LT |
567 | |
568 | switch (sym->st_shndx) { | |
569 | case SHN_COMMON: | |
cb80514d | 570 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
571 | break; |
572 | case SHN_ABS: | |
573 | /* CRC'd symbol */ | |
8d99513c | 574 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 575 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
576 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
577 | export); | |
1da177e4 LT |
578 | } |
579 | break; | |
580 | case SHN_UNDEF: | |
581 | /* undefined symbol */ | |
582 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
583 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
584 | break; | |
4d7365d6 | 585 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 586 | break; |
8d529014 BC |
587 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
588 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
589 | /* add compatibility with older glibc */ | |
590 | #ifndef STT_SPARC_REGISTER | |
591 | #define STT_SPARC_REGISTER STT_REGISTER | |
592 | #endif | |
1da177e4 LT |
593 | if (info->hdr->e_machine == EM_SPARC || |
594 | info->hdr->e_machine == EM_SPARCV9) { | |
595 | /* Ignore register directives. */ | |
8d529014 | 596 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 597 | break; |
62070fa4 SR |
598 | if (symname[0] == '.') { |
599 | char *munged = strdup(symname); | |
600 | munged[0] = '_'; | |
601 | munged[1] = toupper(munged[1]); | |
602 | symname = munged; | |
603 | } | |
1da177e4 LT |
604 | } |
605 | #endif | |
62070fa4 | 606 | |
1da177e4 | 607 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
608 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
609 | mod->unres = | |
610 | alloc_symbol(symname + | |
611 | strlen(MODULE_SYMBOL_PREFIX), | |
612 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
613 | mod->unres); | |
614 | } | |
1da177e4 LT |
615 | break; |
616 | default: | |
617 | /* All exported symbols */ | |
8d99513c | 618 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
619 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
620 | export); | |
1da177e4 LT |
621 | } |
622 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
623 | mod->has_init = 1; | |
624 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
625 | mod->has_cleanup = 1; | |
626 | break; | |
627 | } | |
628 | } | |
629 | ||
5c3ead8c SR |
630 | /** |
631 | * Parse tag=value strings from .modinfo section | |
632 | **/ | |
1da177e4 LT |
633 | static char *next_string(char *string, unsigned long *secsize) |
634 | { | |
635 | /* Skip non-zero chars */ | |
636 | while (string[0]) { | |
637 | string++; | |
638 | if ((*secsize)-- <= 1) | |
639 | return NULL; | |
640 | } | |
641 | ||
642 | /* Skip any zero padding. */ | |
643 | while (!string[0]) { | |
644 | string++; | |
645 | if ((*secsize)-- <= 1) | |
646 | return NULL; | |
647 | } | |
648 | return string; | |
649 | } | |
650 | ||
b817f6fe SR |
651 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
652 | const char *tag, char *info) | |
1da177e4 LT |
653 | { |
654 | char *p; | |
655 | unsigned int taglen = strlen(tag); | |
656 | unsigned long size = modinfo_len; | |
657 | ||
b817f6fe SR |
658 | if (info) { |
659 | size -= info - (char *)modinfo; | |
660 | modinfo = next_string(info, &size); | |
661 | } | |
662 | ||
1da177e4 LT |
663 | for (p = modinfo; p; p = next_string(p, &size)) { |
664 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
665 | return p + taglen + 1; | |
666 | } | |
667 | return NULL; | |
668 | } | |
669 | ||
b817f6fe SR |
670 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
671 | const char *tag) | |
672 | ||
673 | { | |
674 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
675 | } | |
676 | ||
4c8fbca5 SR |
677 | /** |
678 | * Test if string s ends in string sub | |
679 | * return 0 if match | |
680 | **/ | |
681 | static int strrcmp(const char *s, const char *sub) | |
682 | { | |
df578e7d | 683 | int slen, sublen; |
62070fa4 | 684 | |
4c8fbca5 SR |
685 | if (!s || !sub) |
686 | return 1; | |
62070fa4 | 687 | |
4c8fbca5 | 688 | slen = strlen(s); |
df578e7d | 689 | sublen = strlen(sub); |
62070fa4 | 690 | |
4c8fbca5 SR |
691 | if ((slen == 0) || (sublen == 0)) |
692 | return 1; | |
693 | ||
df578e7d SR |
694 | if (sublen > slen) |
695 | return 1; | |
4c8fbca5 | 696 | |
df578e7d | 697 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
698 | } |
699 | ||
ff13f926 SR |
700 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
701 | { | |
58fb0d4f SR |
702 | if (sym) |
703 | return elf->strtab + sym->st_name; | |
704 | else | |
f666751a | 705 | return "(unknown)"; |
ff13f926 SR |
706 | } |
707 | ||
1ce53adf | 708 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
709 | { |
710 | Elf_Shdr *sechdrs = elf->sechdrs; | |
711 | return (void *)elf->hdr + | |
1ce53adf DV |
712 | elf->sechdrs[elf->secindex_strings].sh_offset + |
713 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
714 | } |
715 | ||
716 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
717 | { | |
718 | return (void *)elf->hdr + | |
1ce53adf DV |
719 | elf->sechdrs[elf->secindex_strings].sh_offset + |
720 | sechdr->sh_name; | |
ff13f926 SR |
721 | } |
722 | ||
10668220 SR |
723 | /* if sym is empty or point to a string |
724 | * like ".[0-9]+" then return 1. | |
725 | * This is the optional prefix added by ld to some sections | |
726 | */ | |
727 | static int number_prefix(const char *sym) | |
728 | { | |
729 | if (*sym++ == '\0') | |
730 | return 1; | |
731 | if (*sym != '.') | |
732 | return 0; | |
733 | do { | |
734 | char c = *sym++; | |
735 | if (c < '0' || c > '9') | |
736 | return 0; | |
737 | } while (*sym); | |
738 | return 1; | |
739 | } | |
740 | ||
741 | /* The pattern is an array of simple patterns. | |
742 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 743 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
744 | * "foo*" will match a string that begins with "foo" |
745 | * "foo$" will match a string equal to "foo" or "foo.1" | |
746 | * where the '1' can be any number including several digits. | |
747 | * The $ syntax is for sections where ld append a dot number | |
748 | * to make section name unique. | |
749 | */ | |
5c725138 | 750 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
751 | { |
752 | const char *p; | |
753 | while (*pat) { | |
754 | p = *pat++; | |
755 | const char *endp = p + strlen(p) - 1; | |
756 | ||
6c5bd235 SR |
757 | /* "*foo" */ |
758 | if (*p == '*') { | |
759 | if (strrcmp(sym, p + 1) == 0) | |
760 | return 1; | |
761 | } | |
10668220 | 762 | /* "foo*" */ |
6c5bd235 | 763 | else if (*endp == '*') { |
10668220 SR |
764 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
765 | return 1; | |
766 | } | |
767 | /* "foo$" */ | |
768 | else if (*endp == '$') { | |
769 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
770 | if (number_prefix(sym + strlen(p) - 1)) | |
771 | return 1; | |
772 | } | |
773 | } | |
774 | /* no wildcards */ | |
775 | else { | |
776 | if (strcmp(p, sym) == 0) | |
777 | return 1; | |
778 | } | |
779 | } | |
780 | /* no match */ | |
781 | return 0; | |
782 | } | |
783 | ||
10668220 SR |
784 | /* sections that we do not want to do full section mismatch check on */ |
785 | static const char *section_white_list[] = | |
4391ed6a SR |
786 | { |
787 | ".comment*", | |
788 | ".debug*", | |
1121584f | 789 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 790 | ".GCC-command-line", /* mn10300 */ |
4391ed6a SR |
791 | ".mdebug*", /* alpha, score, mips etc. */ |
792 | ".pdr", /* alpha, score, mips etc. */ | |
793 | ".stab*", | |
794 | ".note*", | |
795 | ".got*", | |
796 | ".toc*", | |
797 | NULL | |
798 | }; | |
10668220 | 799 | |
e241a630 | 800 | /* |
b614a697 | 801 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 802 | * The cause of this is often a section specified in assembler |
b614a697 | 803 | * without "ax" / "aw". |
e241a630 | 804 | */ |
b614a697 AK |
805 | static void check_section(const char *modname, struct elf_info *elf, |
806 | Elf_Shdr *sechdr) | |
e241a630 | 807 | { |
b614a697 AK |
808 | const char *sec = sech_name(elf, sechdr); |
809 | ||
810 | if (sechdr->sh_type == SHT_PROGBITS && | |
811 | !(sechdr->sh_flags & SHF_ALLOC) && | |
812 | !match(sec, section_white_list)) { | |
813 | warn("%s (%s): unexpected non-allocatable section.\n" | |
814 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
815 | "Note that for example <linux/init.h> contains\n" | |
816 | "section definitions for use in .S files.\n\n", | |
817 | modname, sec); | |
e241a630 | 818 | } |
e241a630 SR |
819 | } |
820 | ||
821 | ||
822 | ||
eb8f6890 | 823 | #define ALL_INIT_DATA_SECTIONS \ |
fd6c3a8d JB |
824 | ".init.setup$", ".init.rodata$", \ |
825 | ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ | |
eb8f6890 SR |
826 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" |
827 | #define ALL_EXIT_DATA_SECTIONS \ | |
828 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 829 | |
eb8f6890 SR |
830 | #define ALL_INIT_TEXT_SECTIONS \ |
831 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
832 | #define ALL_EXIT_TEXT_SECTIONS \ | |
833 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 834 | |
4a31a229 UKK |
835 | #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \ |
836 | MEM_INIT_SECTIONS | |
837 | #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \ | |
838 | MEM_EXIT_SECTIONS | |
839 | ||
840 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
841 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 842 | |
6c5bd235 | 843 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
844 | #define TEXT_SECTIONS ".text$" |
845 | ||
fd6c3a8d JB |
846 | #define INIT_SECTIONS ".init.*" |
847 | #define DEV_INIT_SECTIONS ".devinit.*" | |
848 | #define CPU_INIT_SECTIONS ".cpuinit.*" | |
849 | #define MEM_INIT_SECTIONS ".meminit.*" | |
eb8f6890 | 850 | |
fd6c3a8d JB |
851 | #define EXIT_SECTIONS ".exit.*" |
852 | #define DEV_EXIT_SECTIONS ".devexit.*" | |
853 | #define CPU_EXIT_SECTIONS ".cpuexit.*" | |
854 | #define MEM_EXIT_SECTIONS ".memexit.*" | |
eb8f6890 | 855 | |
6c5bd235 | 856 | /* init data sections */ |
eb8f6890 | 857 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
858 | |
859 | /* all init sections */ | |
eb8f6890 | 860 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
861 | |
862 | /* All init and exit sections (code + data) */ | |
863 | static const char *init_exit_sections[] = | |
eb8f6890 | 864 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
865 | |
866 | /* data section */ | |
867 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
868 | ||
6c5bd235 SR |
869 | |
870 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
871 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
872 | "*driver", \ | |
873 | "*_template", /* scsi uses *_template a lot */ \ | |
874 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
875 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
876 | "*_ops", \ | |
877 | "*_probe", \ | |
878 | "*_probe_one", \ | |
879 | "*_console" | |
6c5bd235 SR |
880 | |
881 | static const char *head_sections[] = { ".head.text*", NULL }; | |
882 | static const char *linker_symbols[] = | |
883 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
884 | ||
588ccd73 | 885 | enum mismatch { |
bbd3f4fb UKK |
886 | TEXT_TO_ANY_INIT, |
887 | DATA_TO_ANY_INIT, | |
888 | TEXT_TO_ANY_EXIT, | |
889 | DATA_TO_ANY_EXIT, | |
890 | XXXINIT_TO_SOME_INIT, | |
891 | XXXEXIT_TO_SOME_EXIT, | |
892 | ANY_INIT_TO_ANY_EXIT, | |
893 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
894 | EXPORT_TO_INIT_EXIT, |
895 | }; | |
896 | ||
10668220 SR |
897 | struct sectioncheck { |
898 | const char *fromsec[20]; | |
899 | const char *tosec[20]; | |
588ccd73 | 900 | enum mismatch mismatch; |
af92a82d | 901 | const char *symbol_white_list[20]; |
10668220 SR |
902 | }; |
903 | ||
904 | const struct sectioncheck sectioncheck[] = { | |
905 | /* Do not reference init/exit code/data from | |
906 | * normal code and data | |
907 | */ | |
908 | { | |
588ccd73 SR |
909 | .fromsec = { TEXT_SECTIONS, NULL }, |
910 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 911 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 912 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
913 | }, |
914 | { | |
915 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 916 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 917 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 918 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 919 | }, |
0db25245 UKK |
920 | { |
921 | .fromsec = { DATA_SECTIONS, NULL }, | |
922 | .tosec = { INIT_SECTIONS, NULL }, | |
923 | .mismatch = DATA_TO_ANY_INIT, | |
924 | .symbol_white_list = { | |
925 | "*_template", "*_timer", "*_sht", "*_ops", | |
926 | "*_probe", "*_probe_one", "*_console", NULL | |
927 | }, | |
928 | }, | |
588ccd73 SR |
929 | { |
930 | .fromsec = { TEXT_SECTIONS, NULL }, | |
931 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 932 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 933 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
934 | }, |
935 | { | |
936 | .fromsec = { DATA_SECTIONS, NULL }, | |
937 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 938 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 939 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 SR |
940 | }, |
941 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
942 | { | |
4a31a229 | 943 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 944 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 945 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 946 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 947 | }, |
fd6c3a8d JB |
948 | /* Do not reference cpuinit code/data from meminit code/data */ |
949 | { | |
950 | .fromsec = { MEM_INIT_SECTIONS, NULL }, | |
951 | .tosec = { CPU_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 952 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 953 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
954 | }, |
955 | /* Do not reference meminit code/data from cpuinit code/data */ | |
956 | { | |
957 | .fromsec = { CPU_INIT_SECTIONS, NULL }, | |
958 | .tosec = { MEM_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 959 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 960 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 961 | }, |
eb8f6890 SR |
962 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ |
963 | { | |
4a31a229 | 964 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 965 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 966 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 967 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 968 | }, |
fd6c3a8d JB |
969 | /* Do not reference cpuexit code/data from memexit code/data */ |
970 | { | |
971 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, | |
972 | .tosec = { CPU_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 973 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 974 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d JB |
975 | }, |
976 | /* Do not reference memexit code/data from cpuexit code/data */ | |
977 | { | |
978 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, | |
979 | .tosec = { MEM_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 980 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 981 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
fd6c3a8d | 982 | }, |
10668220 SR |
983 | /* Do not use exit code/data from init code */ |
984 | { | |
eb8f6890 SR |
985 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
986 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 987 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 988 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
989 | }, |
990 | /* Do not use init code/data from exit code */ | |
991 | { | |
eb8f6890 | 992 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 993 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 994 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 995 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
996 | }, |
997 | /* Do not export init/exit functions or data */ | |
998 | { | |
999 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1000 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1001 | .mismatch = EXPORT_TO_INIT_EXIT, |
1002 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1003 | } |
1004 | }; | |
1005 | ||
0d2a636e UKK |
1006 | static const struct sectioncheck *section_mismatch( |
1007 | const char *fromsec, const char *tosec) | |
10668220 SR |
1008 | { |
1009 | int i; | |
1010 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1011 | const struct sectioncheck *check = §ioncheck[0]; | |
1012 | ||
1013 | for (i = 0; i < elems; i++) { | |
1014 | if (match(fromsec, check->fromsec) && | |
1015 | match(tosec, check->tosec)) | |
0d2a636e | 1016 | return check; |
10668220 SR |
1017 | check++; |
1018 | } | |
0d2a636e | 1019 | return NULL; |
10668220 SR |
1020 | } |
1021 | ||
4c8fbca5 SR |
1022 | /** |
1023 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1024 | * |
4c8fbca5 SR |
1025 | * Pattern 1: |
1026 | * If a module parameter is declared __initdata and permissions=0 | |
1027 | * then this is legal despite the warning generated. | |
1028 | * We cannot see value of permissions here, so just ignore | |
1029 | * this pattern. | |
1030 | * The pattern is identified by: | |
1031 | * tosec = .init.data | |
9209aed0 | 1032 | * fromsec = .data* |
4c8fbca5 | 1033 | * atsym =__param* |
62070fa4 | 1034 | * |
6a841528 RR |
1035 | * Pattern 1a: |
1036 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1037 | * The pattern is identified by: | |
1038 | * tosec = .init.text | |
1039 | * fromsec = .data* | |
1040 | * atsym = __param_ops_* | |
1041 | * | |
4c8fbca5 | 1042 | * Pattern 2: |
72ee59b5 | 1043 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1044 | * add, remove, probe functions etc. |
b75dcabd | 1045 | * These functions may often be marked __devinit and we do not want to |
4c8fbca5 SR |
1046 | * warn here. |
1047 | * the pattern is identified by: | |
83cda2bb SR |
1048 | * tosec = init or exit section |
1049 | * fromsec = data section | |
df578e7d SR |
1050 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1051 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1052 | * |
1053 | * Pattern 3: | |
c993971f | 1054 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1055 | * |
1d8af559 | 1056 | * Pattern 4: |
ee6a8545 VG |
1057 | * Some symbols belong to init section but still it is ok to reference |
1058 | * these from non-init sections as these symbols don't have any memory | |
1059 | * allocated for them and symbol address and value are same. So even | |
1060 | * if init section is freed, its ok to reference those symbols. | |
1061 | * For ex. symbols marking the init section boundaries. | |
1062 | * This pattern is identified by | |
1063 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1064 | * |
4c8fbca5 | 1065 | **/ |
af92a82d UKK |
1066 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1067 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1068 | const char *tosec, const char *tosym) |
4c8fbca5 | 1069 | { |
4c8fbca5 | 1070 | /* Check for pattern 1 */ |
6c5bd235 SR |
1071 | if (match(tosec, init_data_sections) && |
1072 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1073 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1074 | return 0; | |
4c8fbca5 | 1075 | |
6a841528 RR |
1076 | /* Check for pattern 1a */ |
1077 | if (strcmp(tosec, ".init.text") == 0 && | |
1078 | match(fromsec, data_sections) && | |
1079 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1080 | return 0; | |
1081 | ||
4c8fbca5 | 1082 | /* Check for pattern 2 */ |
6c5bd235 SR |
1083 | if (match(tosec, init_exit_sections) && |
1084 | match(fromsec, data_sections) && | |
af92a82d | 1085 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1086 | return 0; |
4c8fbca5 | 1087 | |
9bf8cb9b | 1088 | /* Check for pattern 3 */ |
6c5bd235 SR |
1089 | if (match(fromsec, head_sections) && |
1090 | match(tosec, init_sections)) | |
58fb0d4f | 1091 | return 0; |
9bf8cb9b | 1092 | |
1d8af559 | 1093 | /* Check for pattern 4 */ |
58fb0d4f SR |
1094 | if (match(tosym, linker_symbols)) |
1095 | return 0; | |
9bf8cb9b | 1096 | |
58fb0d4f | 1097 | return 1; |
4c8fbca5 SR |
1098 | } |
1099 | ||
93684d3b SR |
1100 | /** |
1101 | * Find symbol based on relocation record info. | |
1102 | * In some cases the symbol supplied is a valid symbol so | |
1103 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1104 | * In other cases the symbol needs to be looked up in the symbol table | |
1105 | * based on section and address. | |
1106 | * **/ | |
9ad21c3f | 1107 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1108 | Elf_Sym *relsym) |
1109 | { | |
1110 | Elf_Sym *sym; | |
9ad21c3f SR |
1111 | Elf_Sym *near = NULL; |
1112 | Elf64_Sword distance = 20; | |
1113 | Elf64_Sword d; | |
1ce53adf | 1114 | unsigned int relsym_secindex; |
93684d3b SR |
1115 | |
1116 | if (relsym->st_name != 0) | |
1117 | return relsym; | |
1ce53adf DV |
1118 | |
1119 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1120 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1121 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1122 | continue; |
ae4ac123 AN |
1123 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1124 | continue; | |
93684d3b SR |
1125 | if (sym->st_value == addr) |
1126 | return sym; | |
9ad21c3f SR |
1127 | /* Find a symbol nearby - addr are maybe negative */ |
1128 | d = sym->st_value - addr; | |
1129 | if (d < 0) | |
1130 | d = addr - sym->st_value; | |
1131 | if (d < distance) { | |
1132 | distance = d; | |
1133 | near = sym; | |
1134 | } | |
93684d3b | 1135 | } |
9ad21c3f SR |
1136 | /* We need a close match */ |
1137 | if (distance < 20) | |
1138 | return near; | |
1139 | else | |
1140 | return NULL; | |
93684d3b SR |
1141 | } |
1142 | ||
da68d61f DB |
1143 | static inline int is_arm_mapping_symbol(const char *str) |
1144 | { | |
1145 | return str[0] == '$' && strchr("atd", str[1]) | |
1146 | && (str[2] == '\0' || str[2] == '.'); | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1151 | * one of the magic symbols emitted used by current ARM tools. | |
1152 | * | |
1153 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1154 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1155 | * only by merging __exit and __init sections into __text, bloating | |
1156 | * the kernel (which is especially evil on embedded platforms). | |
1157 | */ | |
1158 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1159 | { | |
1160 | const char *name = elf->strtab + sym->st_name; | |
1161 | ||
1162 | if (!name || !strlen(name)) | |
1163 | return 0; | |
1164 | return !is_arm_mapping_symbol(name); | |
1165 | } | |
1166 | ||
b39927cf | 1167 | /* |
43c74d17 SR |
1168 | * Find symbols before or equal addr and after addr - in the section sec. |
1169 | * If we find two symbols with equal offset prefer one with a valid name. | |
1170 | * The ELF format may have a better way to detect what type of symbol | |
1171 | * it is, but this works for now. | |
b39927cf | 1172 | **/ |
157c23c8 SR |
1173 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1174 | const char *sec) | |
b39927cf SR |
1175 | { |
1176 | Elf_Sym *sym; | |
157c23c8 | 1177 | Elf_Sym *near = NULL; |
157c23c8 | 1178 | Elf_Addr distance = ~0; |
62070fa4 | 1179 | |
b39927cf SR |
1180 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1181 | const char *symsec; | |
1182 | ||
1ce53adf | 1183 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1184 | continue; |
1ce53adf | 1185 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1186 | if (strcmp(symsec, sec) != 0) |
1187 | continue; | |
da68d61f DB |
1188 | if (!is_valid_name(elf, sym)) |
1189 | continue; | |
b39927cf | 1190 | if (sym->st_value <= addr) { |
157c23c8 SR |
1191 | if ((addr - sym->st_value) < distance) { |
1192 | distance = addr - sym->st_value; | |
1193 | near = sym; | |
1194 | } else if ((addr - sym->st_value) == distance) { | |
1195 | near = sym; | |
43c74d17 | 1196 | } |
b39927cf SR |
1197 | } |
1198 | } | |
157c23c8 | 1199 | return near; |
b39927cf SR |
1200 | } |
1201 | ||
588ccd73 SR |
1202 | /* |
1203 | * Convert a section name to the function/data attribute | |
1204 | * .init.text => __init | |
1205 | * .cpuinit.data => __cpudata | |
1206 | * .memexitconst => __memconst | |
1207 | * etc. | |
cbcf14a9 AS |
1208 | * |
1209 | * The memory of returned value has been allocated on a heap. The user of this | |
1210 | * method should free it after usage. | |
588ccd73 SR |
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, " "); | |
cbcf14a9 | 1233 | return r; |
588ccd73 | 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 | ||
00759c0e RD |
1247 | static void print_section_list(const char * const list[20]) |
1248 | { | |
1249 | const char *const *s = list; | |
1250 | ||
1251 | while (*s) { | |
1252 | fprintf(stderr, "%s", *s); | |
1253 | s++; | |
1254 | if (*s) | |
1255 | fprintf(stderr, ", "); | |
1256 | } | |
1257 | fprintf(stderr, "\n"); | |
1258 | } | |
1259 | ||
58fb0d4f | 1260 | /* |
b39927cf SR |
1261 | * Print a warning about a section mismatch. |
1262 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1263 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1264 | */ |
0d2a636e UKK |
1265 | static void report_sec_mismatch(const char *modname, |
1266 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1267 | const char *fromsec, |
1268 | unsigned long long fromaddr, | |
1269 | const char *fromsym, | |
588ccd73 SR |
1270 | int from_is_func, |
1271 | const char *tosec, const char *tosym, | |
1272 | int to_is_func) | |
1273 | { | |
1274 | const char *from, *from_p; | |
1275 | const char *to, *to_p; | |
37ed19d5 AF |
1276 | char *prl_from; |
1277 | char *prl_to; | |
f666751a SR |
1278 | |
1279 | switch (from_is_func) { | |
1280 | case 0: from = "variable"; from_p = ""; break; | |
1281 | case 1: from = "function"; from_p = "()"; break; | |
1282 | default: from = "(unknown reference)"; from_p = ""; break; | |
1283 | } | |
1284 | switch (to_is_func) { | |
1285 | case 0: to = "variable"; to_p = ""; break; | |
1286 | case 1: to = "function"; to_p = "()"; break; | |
1287 | default: to = "(unknown reference)"; to_p = ""; break; | |
1288 | } | |
588ccd73 | 1289 | |
e5f95c8b SR |
1290 | sec_mismatch_count++; |
1291 | if (!sec_mismatch_verbose) | |
1292 | return; | |
1293 | ||
7c0ac495 GU |
1294 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1295 | "to the %s %s:%s%s\n", | |
1296 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1297 | tosym, to_p); | |
588ccd73 | 1298 | |
0d2a636e | 1299 | switch (mismatch->mismatch) { |
bbd3f4fb | 1300 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1301 | prl_from = sec2annotation(fromsec); |
1302 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1303 | fprintf(stderr, |
f666751a | 1304 | "The function %s%s() references\n" |
588ccd73 SR |
1305 | "the %s %s%s%s.\n" |
1306 | "This is often because %s lacks a %s\n" | |
1307 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1308 | prl_from, fromsym, |
1309 | to, prl_to, tosym, to_p, | |
1310 | fromsym, prl_to, tosym); | |
1311 | free(prl_from); | |
1312 | free(prl_to); | |
588ccd73 | 1313 | break; |
bbd3f4fb | 1314 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1315 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1316 | fprintf(stderr, |
1317 | "The variable %s references\n" | |
1318 | "the %s %s%s%s\n" | |
1319 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1320 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1321 | "or name the variable:\n", |
37ed19d5 | 1322 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1323 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1324 | free(prl_to); |
588ccd73 | 1325 | break; |
58fb0d4f | 1326 | } |
bbd3f4fb | 1327 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1328 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1329 | fprintf(stderr, |
1330 | "The function %s() references a %s in an exit section.\n" | |
1331 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1332 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1333 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1334 | free(prl_to); | |
588ccd73 | 1335 | break; |
bbd3f4fb | 1336 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1337 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1338 | fprintf(stderr, |
1339 | "The variable %s references\n" | |
1340 | "the %s %s%s%s\n" | |
1341 | "If the reference is valid then annotate the\n" | |
1342 | "variable with __exit* (see linux/init.h) or " | |
1343 | "name the variable:\n", | |
37ed19d5 | 1344 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1345 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1346 | free(prl_to); |
588ccd73 SR |
1347 | break; |
1348 | } | |
bbd3f4fb UKK |
1349 | case XXXINIT_TO_SOME_INIT: |
1350 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1351 | prl_from = sec2annotation(fromsec); |
1352 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1353 | fprintf(stderr, |
1354 | "The %s %s%s%s references\n" | |
1355 | "a %s %s%s%s.\n" | |
1356 | "If %s is only used by %s then\n" | |
1357 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1358 | from, prl_from, fromsym, from_p, |
1359 | to, prl_to, tosym, to_p, | |
b1d2675a | 1360 | tosym, fromsym, tosym); |
37ed19d5 AF |
1361 | free(prl_from); |
1362 | free(prl_to); | |
588ccd73 | 1363 | break; |
bbd3f4fb | 1364 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1365 | prl_from = sec2annotation(fromsec); |
1366 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1367 | fprintf(stderr, |
1368 | "The %s %s%s%s references\n" | |
1369 | "a %s %s%s%s.\n" | |
1370 | "This is often seen when error handling " | |
1371 | "in the init function\n" | |
1372 | "uses functionality in the exit path.\n" | |
1373 | "The fix is often to remove the %sannotation of\n" | |
1374 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1375 | from, prl_from, fromsym, from_p, |
1376 | to, prl_to, tosym, to_p, | |
5003bab8 | 1377 | prl_to, tosym, to_p); |
37ed19d5 AF |
1378 | free(prl_from); |
1379 | free(prl_to); | |
588ccd73 | 1380 | break; |
bbd3f4fb | 1381 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1382 | prl_from = sec2annotation(fromsec); |
1383 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1384 | fprintf(stderr, |
1385 | "The %s %s%s%s references\n" | |
1386 | "a %s %s%s%s.\n" | |
1387 | "This is often seen when error handling " | |
1388 | "in the exit function\n" | |
1389 | "uses functionality in the init path.\n" | |
1390 | "The fix is often to remove the %sannotation of\n" | |
1391 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1392 | from, prl_from, fromsym, from_p, |
1393 | to, prl_to, tosym, to_p, | |
1394 | prl_to, tosym, to_p); | |
1395 | free(prl_from); | |
1396 | free(prl_to); | |
588ccd73 SR |
1397 | break; |
1398 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1399 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1400 | fprintf(stderr, |
1401 | "The symbol %s is exported and annotated %s\n" | |
1402 | "Fix this by removing the %sannotation of %s " | |
1403 | "or drop the export.\n", | |
37ed19d5 AF |
1404 | tosym, prl_to, prl_to, tosym); |
1405 | free(prl_to); | |
588ccd73 SR |
1406 | break; |
1407 | } | |
1408 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1409 | } |
1410 | ||
1411 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1412 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1413 | { | |
1414 | const char *tosec; | |
0d2a636e | 1415 | const struct sectioncheck *mismatch; |
58fb0d4f | 1416 | |
1ce53adf | 1417 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1418 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1419 | if (mismatch) { |
588ccd73 SR |
1420 | Elf_Sym *to; |
1421 | Elf_Sym *from; | |
58fb0d4f | 1422 | const char *tosym; |
588ccd73 | 1423 | const char *fromsym; |
58fb0d4f | 1424 | |
588ccd73 SR |
1425 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1426 | fromsym = sym_name(elf, from); | |
1427 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1428 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1429 | |
1430 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1431 | if (secref_whitelist(mismatch, |
1432 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1433 | report_sec_mismatch(modname, mismatch, |
1434 | fromsec, r->r_offset, fromsym, | |
1435 | is_function(from), tosec, tosym, | |
1436 | is_function(to)); | |
58fb0d4f | 1437 | } |
b39927cf SR |
1438 | } |
1439 | } | |
1440 | ||
ae4ac123 | 1441 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1442 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1443 | { |
1444 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1445 | int section = sechdr->sh_info; |
ae4ac123 AN |
1446 | |
1447 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1448 | r->r_offset; |
ae4ac123 AN |
1449 | } |
1450 | ||
5b24c071 | 1451 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1452 | { |
1453 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1454 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1455 | |
1456 | switch (r_typ) { | |
1457 | case R_386_32: | |
1458 | r->r_addend = TO_NATIVE(*location); | |
1459 | break; | |
1460 | case R_386_PC32: | |
1461 | r->r_addend = TO_NATIVE(*location) + 4; | |
1462 | /* For CONFIG_RELOCATABLE=y */ | |
1463 | if (elf->hdr->e_type == ET_EXEC) | |
1464 | r->r_addend += r->r_offset; | |
1465 | break; | |
1466 | } | |
1467 | return 0; | |
1468 | } | |
1469 | ||
5b24c071 | 1470 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1471 | { |
1472 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1473 | ||
1474 | switch (r_typ) { | |
1475 | case R_ARM_ABS32: | |
1476 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1477 | r->r_addend = (int)(long) |
1478 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1479 | break; |
1480 | case R_ARM_PC24: | |
1481 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1482 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1483 | sechdr->sh_offset + |
1484 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1485 | break; |
1486 | default: | |
1487 | return 1; | |
1488 | } | |
1489 | return 0; | |
1490 | } | |
1491 | ||
5b24c071 | 1492 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1493 | { |
1494 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1495 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1496 | unsigned int inst; |
1497 | ||
1498 | if (r_typ == R_MIPS_HI16) | |
1499 | return 1; /* skip this */ | |
1500 | inst = TO_NATIVE(*location); | |
1501 | switch (r_typ) { | |
1502 | case R_MIPS_LO16: | |
1503 | r->r_addend = inst & 0xffff; | |
1504 | break; | |
1505 | case R_MIPS_26: | |
1506 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1507 | break; | |
1508 | case R_MIPS_32: | |
1509 | r->r_addend = inst; | |
1510 | break; | |
1511 | } | |
1512 | return 0; | |
1513 | } | |
1514 | ||
5b24c071 | 1515 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1516 | Elf_Shdr *sechdr) |
5b24c071 SR |
1517 | { |
1518 | Elf_Sym *sym; | |
1519 | Elf_Rela *rela; | |
1520 | Elf_Rela r; | |
1521 | unsigned int r_sym; | |
1522 | const char *fromsec; | |
5b24c071 | 1523 | |
ff13f926 | 1524 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1525 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1526 | ||
ff13f926 | 1527 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1528 | fromsec += strlen(".rela"); |
1529 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1530 | if (match(fromsec, section_white_list)) |
5b24c071 | 1531 | return; |
e241a630 | 1532 | |
5b24c071 SR |
1533 | for (rela = start; rela < stop; rela++) { |
1534 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1535 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1536 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1537 | unsigned int r_typ; |
1538 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1539 | r_sym = TO_NATIVE(r_sym); | |
1540 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1541 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1542 | } else { | |
1543 | r.r_info = TO_NATIVE(rela->r_info); | |
1544 | r_sym = ELF_R_SYM(r.r_info); | |
1545 | } | |
1546 | #else | |
1547 | r.r_info = TO_NATIVE(rela->r_info); | |
1548 | r_sym = ELF_R_SYM(r.r_info); | |
1549 | #endif | |
1550 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1551 | sym = elf->symtab_start + r_sym; | |
1552 | /* Skip special sections */ | |
1ce53adf | 1553 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1554 | continue; |
58fb0d4f | 1555 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1556 | } |
1557 | } | |
1558 | ||
1559 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1560 | Elf_Shdr *sechdr) |
5b24c071 SR |
1561 | { |
1562 | Elf_Sym *sym; | |
1563 | Elf_Rel *rel; | |
1564 | Elf_Rela r; | |
1565 | unsigned int r_sym; | |
1566 | const char *fromsec; | |
5b24c071 | 1567 | |
ff13f926 | 1568 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1569 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1570 | ||
ff13f926 | 1571 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1572 | fromsec += strlen(".rel"); |
1573 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1574 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1575 | return; |
1576 | ||
1577 | for (rel = start; rel < stop; rel++) { | |
1578 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1579 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1580 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1581 | unsigned int r_typ; |
1582 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1583 | r_sym = TO_NATIVE(r_sym); | |
1584 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1585 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1586 | } else { | |
1587 | r.r_info = TO_NATIVE(rel->r_info); | |
1588 | r_sym = ELF_R_SYM(r.r_info); | |
1589 | } | |
1590 | #else | |
1591 | r.r_info = TO_NATIVE(rel->r_info); | |
1592 | r_sym = ELF_R_SYM(r.r_info); | |
1593 | #endif | |
1594 | r.r_addend = 0; | |
ff13f926 | 1595 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1596 | case EM_386: |
1597 | if (addend_386_rel(elf, sechdr, &r)) | |
1598 | continue; | |
1599 | break; | |
1600 | case EM_ARM: | |
1601 | if (addend_arm_rel(elf, sechdr, &r)) | |
1602 | continue; | |
1603 | break; | |
1604 | case EM_MIPS: | |
1605 | if (addend_mips_rel(elf, sechdr, &r)) | |
1606 | continue; | |
1607 | break; | |
1608 | } | |
1609 | sym = elf->symtab_start + r_sym; | |
1610 | /* Skip special sections */ | |
1ce53adf | 1611 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1612 | continue; |
58fb0d4f | 1613 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1614 | } |
1615 | } | |
1616 | ||
b39927cf SR |
1617 | /** |
1618 | * A module includes a number of sections that are discarded | |
1619 | * either when loaded or when used as built-in. | |
1620 | * For loaded modules all functions marked __init and all data | |
b595076a | 1621 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1622 | * Likewise for modules used built-in the sections marked __exit |
1623 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1624 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1625 | * The check_sec_ref() function traverses all relocation records |
1626 | * to find all references to a section that reference a section that will | |
1627 | * be discarded and warns about it. | |
1628 | **/ | |
1629 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1630 | struct elf_info *elf) |
b39927cf SR |
1631 | { |
1632 | int i; | |
b39927cf | 1633 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1634 | |
b39927cf | 1635 | /* Walk through all sections */ |
1ce53adf | 1636 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1637 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1638 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1639 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1640 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1641 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1642 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1643 | } |
1644 | } | |
1645 | ||
5c3ead8c | 1646 | static void read_symbols(char *modname) |
1da177e4 LT |
1647 | { |
1648 | const char *symname; | |
1649 | char *version; | |
b817f6fe | 1650 | char *license; |
1da177e4 LT |
1651 | struct module *mod; |
1652 | struct elf_info info = { }; | |
1653 | Elf_Sym *sym; | |
1654 | ||
85bd2fdd SR |
1655 | if (!parse_elf(&info, modname)) |
1656 | return; | |
1da177e4 LT |
1657 | |
1658 | mod = new_module(modname); | |
1659 | ||
1660 | /* When there's no vmlinux, don't print warnings about | |
1661 | * unresolved symbols (since there'll be too many ;) */ | |
1662 | if (is_vmlinux(modname)) { | |
1da177e4 | 1663 | have_vmlinux = 1; |
1da177e4 LT |
1664 | mod->skip = 1; |
1665 | } | |
1666 | ||
b817f6fe | 1667 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1668 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1669 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1670 | "see include/linux/module.h for " | |
1671 | "more information\n", modname); | |
b817f6fe SR |
1672 | while (license) { |
1673 | if (license_is_gpl_compatible(license)) | |
1674 | mod->gpl_compatible = 1; | |
1675 | else { | |
1676 | mod->gpl_compatible = 0; | |
1677 | break; | |
1678 | } | |
1679 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1680 | "license", license); | |
1681 | } | |
1682 | ||
1da177e4 LT |
1683 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1684 | symname = info.strtab + sym->st_name; | |
1685 | ||
1686 | handle_modversions(mod, &info, sym, symname); | |
1687 | handle_moddevtable(mod, &info, sym, symname); | |
1688 | } | |
d1f25e66 | 1689 | if (!is_vmlinux(modname) || |
10668220 SR |
1690 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1691 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1692 | |
1693 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1694 | if (version) | |
1695 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1696 | version - (char *)info.hdr); | |
1697 | if (version || (all_versions && !is_vmlinux(modname))) | |
1698 | get_src_version(modname, mod->srcversion, | |
1699 | sizeof(mod->srcversion)-1); | |
1700 | ||
1701 | parse_elf_finish(&info); | |
1702 | ||
8c8ef42a | 1703 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1704 | * never passed as an argument to an exported function, so |
1705 | * the automatic versioning doesn't pick it up, but it's really | |
1706 | * important anyhow */ | |
1707 | if (modversions) | |
8c8ef42a | 1708 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1709 | } |
1710 | ||
1711 | #define SZ 500 | |
1712 | ||
1713 | /* We first write the generated file into memory using the | |
1714 | * following helper, then compare to the file on disk and | |
1715 | * only update the later if anything changed */ | |
1716 | ||
5c3ead8c SR |
1717 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1718 | const char *fmt, ...) | |
1da177e4 LT |
1719 | { |
1720 | char tmp[SZ]; | |
1721 | int len; | |
1722 | va_list ap; | |
62070fa4 | 1723 | |
1da177e4 LT |
1724 | va_start(ap, fmt); |
1725 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1726 | buf_write(buf, tmp, len); |
1da177e4 LT |
1727 | va_end(ap); |
1728 | } | |
1729 | ||
5c3ead8c | 1730 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1731 | { |
1732 | if (buf->size - buf->pos < len) { | |
7670f023 | 1733 | buf->size += len + SZ; |
1da177e4 LT |
1734 | buf->p = realloc(buf->p, buf->size); |
1735 | } | |
1736 | strncpy(buf->p + buf->pos, s, len); | |
1737 | buf->pos += len; | |
1738 | } | |
1739 | ||
c96fca21 SR |
1740 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1741 | { | |
1742 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1743 | ||
1744 | switch (exp) { | |
1745 | case export_gpl: | |
1746 | fatal("modpost: GPL-incompatible module %s%s " | |
1747 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1748 | break; | |
1749 | case export_unused_gpl: | |
1750 | fatal("modpost: GPL-incompatible module %s%s " | |
1751 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1752 | break; | |
1753 | case export_gpl_future: | |
1754 | warn("modpost: GPL-incompatible module %s%s " | |
1755 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1756 | break; | |
1757 | case export_plain: | |
1758 | case export_unused: | |
1759 | case export_unknown: | |
1760 | /* ignore */ | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | ||
df578e7d | 1765 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1766 | { |
1767 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1768 | ||
1769 | switch (exp) { | |
1770 | case export_unused: | |
1771 | case export_unused_gpl: | |
1772 | warn("modpost: module %s%s " | |
1773 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1774 | break; | |
1775 | default: | |
1776 | /* ignore */ | |
1777 | break; | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1782 | { |
1783 | struct symbol *s, *exp; | |
1784 | ||
1785 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1786 | const char *basename; |
b817f6fe SR |
1787 | exp = find_symbol(s->name); |
1788 | if (!exp || exp->module == mod) | |
1789 | continue; | |
6449bd62 | 1790 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1791 | if (basename) |
1792 | basename++; | |
c96fca21 SR |
1793 | else |
1794 | basename = mod->name; | |
1795 | if (!mod->gpl_compatible) | |
1796 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1797 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1798 | } |
b817f6fe SR |
1799 | } |
1800 | ||
5c3ead8c SR |
1801 | /** |
1802 | * Header for the generated file | |
1803 | **/ | |
1804 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1805 | { |
1806 | buf_printf(b, "#include <linux/module.h>\n"); | |
1807 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1808 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1809 | buf_printf(b, "\n"); | |
1810 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1811 | buf_printf(b, "\n"); | |
1da177e4 LT |
1812 | buf_printf(b, "struct module __this_module\n"); |
1813 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1814 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1815 | if (mod->has_init) |
1816 | buf_printf(b, " .init = init_module,\n"); | |
1817 | if (mod->has_cleanup) | |
1818 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1819 | " .exit = cleanup_module,\n" | |
1820 | "#endif\n"); | |
e61a1c1c | 1821 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1822 | buf_printf(b, "};\n"); |
1823 | } | |
1824 | ||
5c725138 | 1825 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1826 | { |
1827 | static const char *staging_dir = "drivers/staging"; | |
1828 | ||
1829 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1830 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1831 | } | |
1832 | ||
5c3ead8c SR |
1833 | /** |
1834 | * Record CRCs for unresolved symbols | |
1835 | **/ | |
c53ddacd | 1836 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1837 | { |
1838 | struct symbol *s, *exp; | |
c53ddacd | 1839 | int err = 0; |
1da177e4 LT |
1840 | |
1841 | for (s = mod->unres; s; s = s->next) { | |
1842 | exp = find_symbol(s->name); | |
1843 | if (!exp || exp->module == mod) { | |
c53ddacd | 1844 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1845 | if (warn_unresolved) { |
1846 | warn("\"%s\" [%s.ko] undefined!\n", | |
1847 | s->name, mod->name); | |
1848 | } else { | |
1849 | merror("\"%s\" [%s.ko] undefined!\n", | |
1850 | s->name, mod->name); | |
1851 | err = 1; | |
1852 | } | |
c53ddacd | 1853 | } |
1da177e4 LT |
1854 | continue; |
1855 | } | |
1856 | s->module = exp->module; | |
1857 | s->crc_valid = exp->crc_valid; | |
1858 | s->crc = exp->crc; | |
1859 | } | |
1860 | ||
1861 | if (!modversions) | |
c53ddacd | 1862 | return err; |
1da177e4 LT |
1863 | |
1864 | buf_printf(b, "\n"); | |
1865 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1866 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1867 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1868 | ||
1869 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1870 | if (!s->module) |
1da177e4 | 1871 | continue; |
1da177e4 | 1872 | if (!s->crc_valid) { |
cb80514d | 1873 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1874 | s->name, mod->name); |
1875 | continue; | |
1876 | } | |
1877 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1878 | } | |
1879 | ||
1880 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1881 | |
1882 | return err; | |
1da177e4 LT |
1883 | } |
1884 | ||
5c3ead8c SR |
1885 | static void add_depends(struct buffer *b, struct module *mod, |
1886 | struct module *modules) | |
1da177e4 LT |
1887 | { |
1888 | struct symbol *s; | |
1889 | struct module *m; | |
1890 | int first = 1; | |
1891 | ||
df578e7d | 1892 | for (m = modules; m; m = m->next) |
1da177e4 | 1893 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1894 | |
1895 | buf_printf(b, "\n"); | |
1896 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1897 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1898 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1899 | buf_printf(b, "\"depends="); | |
1900 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1901 | const char *p; |
1da177e4 LT |
1902 | if (!s->module) |
1903 | continue; | |
1904 | ||
1905 | if (s->module->seen) | |
1906 | continue; | |
1907 | ||
1908 | s->module->seen = 1; | |
df578e7d SR |
1909 | p = strrchr(s->module->name, '/'); |
1910 | if (p) | |
a61b2dfd SR |
1911 | p++; |
1912 | else | |
1913 | p = s->module->name; | |
1914 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1915 | first = 0; |
1916 | } | |
1917 | buf_printf(b, "\";\n"); | |
1918 | } | |
1919 | ||
5c3ead8c | 1920 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1921 | { |
1922 | if (mod->srcversion[0]) { | |
1923 | buf_printf(b, "\n"); | |
1924 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1925 | mod->srcversion); | |
1926 | } | |
1927 | } | |
1928 | ||
5c3ead8c | 1929 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1930 | { |
1931 | char *tmp; | |
1932 | FILE *file; | |
1933 | struct stat st; | |
1934 | ||
1935 | file = fopen(fname, "r"); | |
1936 | if (!file) | |
1937 | goto write; | |
1938 | ||
1939 | if (fstat(fileno(file), &st) < 0) | |
1940 | goto close_write; | |
1941 | ||
1942 | if (st.st_size != b->pos) | |
1943 | goto close_write; | |
1944 | ||
1945 | tmp = NOFAIL(malloc(b->pos)); | |
1946 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1947 | goto free_write; | |
1948 | ||
1949 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1950 | goto free_write; | |
1951 | ||
1952 | free(tmp); | |
1953 | fclose(file); | |
1954 | return; | |
1955 | ||
1956 | free_write: | |
1957 | free(tmp); | |
1958 | close_write: | |
1959 | fclose(file); | |
1960 | write: | |
1961 | file = fopen(fname, "w"); | |
1962 | if (!file) { | |
1963 | perror(fname); | |
1964 | exit(1); | |
1965 | } | |
1966 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1967 | perror(fname); | |
1968 | exit(1); | |
1969 | } | |
1970 | fclose(file); | |
1971 | } | |
1972 | ||
bd5cbced | 1973 | /* parse Module.symvers file. line format: |
534b89a9 | 1974 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1975 | **/ |
040fcc81 | 1976 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1977 | { |
1978 | unsigned long size, pos = 0; | |
1979 | void *file = grab_file(fname, &size); | |
1980 | char *line; | |
1981 | ||
df578e7d | 1982 | if (!file) |
1da177e4 LT |
1983 | /* No symbol versions, silently ignore */ |
1984 | return; | |
1985 | ||
1986 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1987 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1988 | unsigned int crc; |
1989 | struct module *mod; | |
040fcc81 | 1990 | struct symbol *s; |
1da177e4 LT |
1991 | |
1992 | if (!(symname = strchr(line, '\t'))) | |
1993 | goto fail; | |
1994 | *symname++ = '\0'; | |
1995 | if (!(modname = strchr(symname, '\t'))) | |
1996 | goto fail; | |
1997 | *modname++ = '\0'; | |
9ac545b0 | 1998 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1999 | *export++ = '\0'; |
534b89a9 SR |
2000 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2001 | *end = '\0'; | |
1da177e4 LT |
2002 | crc = strtoul(line, &d, 16); |
2003 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2004 | goto fail; | |
df578e7d SR |
2005 | mod = find_module(modname); |
2006 | if (!mod) { | |
2007 | if (is_vmlinux(modname)) | |
1da177e4 | 2008 | have_vmlinux = 1; |
0fa3a88c | 2009 | mod = new_module(modname); |
1da177e4 LT |
2010 | mod->skip = 1; |
2011 | } | |
bd5cbced | 2012 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2013 | s->kernel = kernel; |
2014 | s->preloaded = 1; | |
bd5cbced | 2015 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2016 | } |
2017 | return; | |
2018 | fail: | |
2019 | fatal("parse error in symbol dump file\n"); | |
2020 | } | |
2021 | ||
040fcc81 SR |
2022 | /* For normal builds always dump all symbols. |
2023 | * For external modules only dump symbols | |
2024 | * that are not read from kernel Module.symvers. | |
2025 | **/ | |
2026 | static int dump_sym(struct symbol *sym) | |
2027 | { | |
2028 | if (!external_module) | |
2029 | return 1; | |
2030 | if (sym->vmlinux || sym->kernel) | |
2031 | return 0; | |
2032 | return 1; | |
2033 | } | |
62070fa4 | 2034 | |
5c3ead8c | 2035 | static void write_dump(const char *fname) |
1da177e4 LT |
2036 | { |
2037 | struct buffer buf = { }; | |
2038 | struct symbol *symbol; | |
2039 | int n; | |
2040 | ||
2041 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2042 | symbol = symbolhash[n]; | |
2043 | while (symbol) { | |
040fcc81 | 2044 | if (dump_sym(symbol)) |
bd5cbced | 2045 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2046 | symbol->crc, symbol->name, |
bd5cbced RP |
2047 | symbol->module->name, |
2048 | export_str(symbol->export)); | |
1da177e4 LT |
2049 | symbol = symbol->next; |
2050 | } | |
2051 | } | |
2052 | write_if_changed(&buf, fname); | |
2053 | } | |
2054 | ||
2d04b5ae RH |
2055 | struct ext_sym_list { |
2056 | struct ext_sym_list *next; | |
2057 | const char *file; | |
2058 | }; | |
2059 | ||
5c3ead8c | 2060 | int main(int argc, char **argv) |
1da177e4 LT |
2061 | { |
2062 | struct module *mod; | |
2063 | struct buffer buf = { }; | |
040fcc81 SR |
2064 | char *kernel_read = NULL, *module_read = NULL; |
2065 | char *dump_write = NULL; | |
1da177e4 | 2066 | int opt; |
c53ddacd | 2067 | int err; |
2d04b5ae RH |
2068 | struct ext_sym_list *extsym_iter; |
2069 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2070 | |
2d04b5ae | 2071 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d SR |
2072 | switch (opt) { |
2073 | case 'i': | |
2074 | kernel_read = optarg; | |
2075 | break; | |
2076 | case 'I': | |
2077 | module_read = optarg; | |
2078 | external_module = 1; | |
2079 | break; | |
4ce6efed SR |
2080 | case 'c': |
2081 | cross_build = 1; | |
2082 | break; | |
2d04b5ae RH |
2083 | case 'e': |
2084 | external_module = 1; | |
2085 | extsym_iter = | |
2086 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2087 | extsym_iter->next = extsym_start; | |
2088 | extsym_iter->file = optarg; | |
2089 | extsym_start = extsym_iter; | |
2090 | break; | |
df578e7d SR |
2091 | case 'm': |
2092 | modversions = 1; | |
2093 | break; | |
2094 | case 'o': | |
2095 | dump_write = optarg; | |
2096 | break; | |
2097 | case 'a': | |
2098 | all_versions = 1; | |
2099 | break; | |
2100 | case 's': | |
2101 | vmlinux_section_warnings = 0; | |
2102 | break; | |
588ccd73 SR |
2103 | case 'S': |
2104 | sec_mismatch_verbose = 0; | |
2105 | break; | |
df578e7d SR |
2106 | case 'w': |
2107 | warn_unresolved = 1; | |
2108 | break; | |
2109 | default: | |
2110 | exit(1); | |
1da177e4 LT |
2111 | } |
2112 | } | |
2113 | ||
040fcc81 SR |
2114 | if (kernel_read) |
2115 | read_dump(kernel_read, 1); | |
2116 | if (module_read) | |
2117 | read_dump(module_read, 0); | |
2d04b5ae RH |
2118 | while (extsym_start) { |
2119 | read_dump(extsym_start->file, 0); | |
2120 | extsym_iter = extsym_start->next; | |
2121 | free(extsym_start); | |
2122 | extsym_start = extsym_iter; | |
2123 | } | |
1da177e4 | 2124 | |
df578e7d | 2125 | while (optind < argc) |
1da177e4 | 2126 | read_symbols(argv[optind++]); |
1da177e4 | 2127 | |
b817f6fe SR |
2128 | for (mod = modules; mod; mod = mod->next) { |
2129 | if (mod->skip) | |
2130 | continue; | |
c96fca21 | 2131 | check_exports(mod); |
b817f6fe SR |
2132 | } |
2133 | ||
c53ddacd KK |
2134 | err = 0; |
2135 | ||
1da177e4 | 2136 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2137 | char fname[strlen(mod->name) + 10]; |
2138 | ||
1da177e4 LT |
2139 | if (mod->skip) |
2140 | continue; | |
2141 | ||
2142 | buf.pos = 0; | |
2143 | ||
2144 | add_header(&buf, mod); | |
a9860bf0 | 2145 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2146 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2147 | add_depends(&buf, mod, modules); |
2148 | add_moddevtable(&buf, mod); | |
2149 | add_srcversion(&buf, mod); | |
2150 | ||
2151 | sprintf(fname, "%s.mod.c", mod->name); | |
2152 | write_if_changed(&buf, fname); | |
2153 | } | |
2154 | ||
2155 | if (dump_write) | |
2156 | write_dump(dump_write); | |
588ccd73 | 2157 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2158 | warn("modpost: Found %d section mismatch(es).\n" |
2159 | "To see full details build your kernel with:\n" | |
2160 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2161 | sec_mismatch_count); | |
1da177e4 | 2162 | |
c53ddacd | 2163 | return err; |
1da177e4 | 2164 | } |