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 LT |
16 | #include <ctype.h> |
17 | #include "modpost.h" | |
b817f6fe | 18 | #include "../../include/linux/license.h" |
1da177e4 LT |
19 | |
20 | /* Are we using CONFIG_MODVERSIONS? */ | |
21 | int modversions = 0; | |
22 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
23 | int have_vmlinux = 0; | |
24 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
25 | static int all_versions = 0; | |
040fcc81 SR |
26 | /* If we are modposting external module set to 1 */ |
27 | static int external_module = 0; | |
8d8d8289 SR |
28 | /* Warn about section mismatch in vmlinux if set to 1 */ |
29 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
30 | /* Only warn about unresolved symbols */ |
31 | static int warn_unresolved = 0; | |
bd5cbced | 32 | /* How a symbol is exported */ |
588ccd73 SR |
33 | static int sec_mismatch_count = 0; |
34 | static int sec_mismatch_verbose = 1; | |
35 | ||
c96fca21 SR |
36 | enum export { |
37 | export_plain, export_unused, export_gpl, | |
38 | export_unused_gpl, export_gpl_future, export_unknown | |
39 | }; | |
1da177e4 | 40 | |
6d9a89ea AK |
41 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
42 | ||
43 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
44 | { |
45 | va_list arglist; | |
46 | ||
47 | fprintf(stderr, "FATAL: "); | |
48 | ||
49 | va_start(arglist, fmt); | |
50 | vfprintf(stderr, fmt, arglist); | |
51 | va_end(arglist); | |
52 | ||
53 | exit(1); | |
54 | } | |
55 | ||
6d9a89ea | 56 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
57 | { |
58 | va_list arglist; | |
59 | ||
60 | fprintf(stderr, "WARNING: "); | |
61 | ||
62 | va_start(arglist, fmt); | |
63 | vfprintf(stderr, fmt, arglist); | |
64 | va_end(arglist); | |
65 | } | |
66 | ||
6d9a89ea | 67 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
68 | { |
69 | va_list arglist; | |
70 | ||
71 | fprintf(stderr, "ERROR: "); | |
72 | ||
73 | va_start(arglist, fmt); | |
74 | vfprintf(stderr, fmt, arglist); | |
75 | va_end(arglist); | |
76 | } | |
77 | ||
040fcc81 SR |
78 | static int is_vmlinux(const char *modname) |
79 | { | |
80 | const char *myname; | |
81 | ||
df578e7d SR |
82 | myname = strrchr(modname, '/'); |
83 | if (myname) | |
040fcc81 SR |
84 | myname++; |
85 | else | |
86 | myname = modname; | |
87 | ||
741f98fe SR |
88 | return (strcmp(myname, "vmlinux") == 0) || |
89 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
90 | } |
91 | ||
1da177e4 LT |
92 | void *do_nofail(void *ptr, const char *expr) |
93 | { | |
df578e7d | 94 | if (!ptr) |
1da177e4 | 95 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 96 | |
1da177e4 LT |
97 | return ptr; |
98 | } | |
99 | ||
100 | /* A list of all modules we processed */ | |
1da177e4 LT |
101 | static struct module *modules; |
102 | ||
5c3ead8c | 103 | static struct module *find_module(char *modname) |
1da177e4 LT |
104 | { |
105 | struct module *mod; | |
106 | ||
107 | for (mod = modules; mod; mod = mod->next) | |
108 | if (strcmp(mod->name, modname) == 0) | |
109 | break; | |
110 | return mod; | |
111 | } | |
112 | ||
5c3ead8c | 113 | static struct module *new_module(char *modname) |
1da177e4 LT |
114 | { |
115 | struct module *mod; | |
116 | char *p, *s; | |
62070fa4 | 117 | |
1da177e4 LT |
118 | mod = NOFAIL(malloc(sizeof(*mod))); |
119 | memset(mod, 0, sizeof(*mod)); | |
120 | p = NOFAIL(strdup(modname)); | |
121 | ||
122 | /* strip trailing .o */ | |
df578e7d SR |
123 | s = strrchr(p, '.'); |
124 | if (s != NULL) | |
1da177e4 LT |
125 | if (strcmp(s, ".o") == 0) |
126 | *s = '\0'; | |
127 | ||
128 | /* add to list */ | |
129 | mod->name = p; | |
b817f6fe | 130 | mod->gpl_compatible = -1; |
1da177e4 LT |
131 | mod->next = modules; |
132 | modules = mod; | |
133 | ||
134 | return mod; | |
135 | } | |
136 | ||
137 | /* A hash of all exported symbols, | |
138 | * struct symbol is also used for lists of unresolved symbols */ | |
139 | ||
140 | #define SYMBOL_HASH_SIZE 1024 | |
141 | ||
142 | struct symbol { | |
143 | struct symbol *next; | |
144 | struct module *module; | |
145 | unsigned int crc; | |
146 | int crc_valid; | |
147 | unsigned int weak:1; | |
040fcc81 SR |
148 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
149 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
150 | * (only for external modules) **/ | |
8e70c458 | 151 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 152 | enum export export; /* Type of export */ |
1da177e4 LT |
153 | char name[0]; |
154 | }; | |
155 | ||
156 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
157 | ||
158 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
159 | static inline unsigned int tdb_hash(const char *name) | |
160 | { | |
161 | unsigned value; /* Used to compute the hash value. */ | |
162 | unsigned i; /* Used to cycle through random values. */ | |
163 | ||
164 | /* Set the initial value from the key size. */ | |
df578e7d | 165 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
166 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
167 | ||
168 | return (1103515243 * value + 12345); | |
169 | } | |
170 | ||
5c3ead8c SR |
171 | /** |
172 | * Allocate a new symbols for use in the hash of exported symbols or | |
173 | * the list of unresolved symbols per module | |
174 | **/ | |
175 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
176 | struct symbol *next) | |
1da177e4 LT |
177 | { |
178 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
179 | ||
180 | memset(s, 0, sizeof(*s)); | |
181 | strcpy(s->name, name); | |
182 | s->weak = weak; | |
183 | s->next = next; | |
184 | return s; | |
185 | } | |
186 | ||
187 | /* For the hash of exported symbols */ | |
bd5cbced RP |
188 | static struct symbol *new_symbol(const char *name, struct module *module, |
189 | enum export export) | |
1da177e4 LT |
190 | { |
191 | unsigned int hash; | |
192 | struct symbol *new; | |
193 | ||
194 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
195 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
196 | new->module = module; | |
bd5cbced | 197 | new->export = export; |
040fcc81 | 198 | return new; |
1da177e4 LT |
199 | } |
200 | ||
5c3ead8c | 201 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
202 | { |
203 | struct symbol *s; | |
204 | ||
205 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
206 | if (name[0] == '.') | |
207 | name++; | |
208 | ||
df578e7d | 209 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
210 | if (strcmp(s->name, name) == 0) |
211 | return s; | |
212 | } | |
213 | return NULL; | |
214 | } | |
215 | ||
bd5cbced RP |
216 | static struct { |
217 | const char *str; | |
218 | enum export export; | |
219 | } export_list[] = { | |
220 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 221 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 222 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 223 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
224 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
225 | { .str = "(unknown)", .export = export_unknown }, | |
226 | }; | |
227 | ||
228 | ||
229 | static const char *export_str(enum export ex) | |
230 | { | |
231 | return export_list[ex].str; | |
232 | } | |
233 | ||
df578e7d | 234 | static enum export export_no(const char *s) |
bd5cbced RP |
235 | { |
236 | int i; | |
df578e7d | 237 | |
534b89a9 SR |
238 | if (!s) |
239 | return export_unknown; | |
bd5cbced RP |
240 | for (i = 0; export_list[i].export != export_unknown; i++) { |
241 | if (strcmp(export_list[i].str, s) == 0) | |
242 | return export_list[i].export; | |
243 | } | |
244 | return export_unknown; | |
245 | } | |
246 | ||
247 | static enum export export_from_sec(struct elf_info *elf, Elf_Section sec) | |
248 | { | |
249 | if (sec == elf->export_sec) | |
250 | return export_plain; | |
c96fca21 SR |
251 | else if (sec == elf->export_unused_sec) |
252 | return export_unused; | |
bd5cbced RP |
253 | else if (sec == elf->export_gpl_sec) |
254 | return export_gpl; | |
c96fca21 SR |
255 | else if (sec == elf->export_unused_gpl_sec) |
256 | return export_unused_gpl; | |
bd5cbced RP |
257 | else if (sec == elf->export_gpl_future_sec) |
258 | return export_gpl_future; | |
259 | else | |
260 | return export_unknown; | |
261 | } | |
262 | ||
5c3ead8c SR |
263 | /** |
264 | * Add an exported symbol - it may have already been added without a | |
265 | * CRC, in this case just update the CRC | |
266 | **/ | |
bd5cbced RP |
267 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
268 | enum export export) | |
1da177e4 LT |
269 | { |
270 | struct symbol *s = find_symbol(name); | |
271 | ||
272 | if (!s) { | |
bd5cbced | 273 | s = new_symbol(name, mod, export); |
8e70c458 SR |
274 | } else { |
275 | if (!s->preloaded) { | |
7b75b13c | 276 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
277 | "was in %s%s\n", mod->name, name, |
278 | s->module->name, | |
279 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
280 | } else { |
281 | /* In case Modules.symvers was out of date */ | |
282 | s->module = mod; | |
8e70c458 | 283 | } |
1da177e4 | 284 | } |
8e70c458 | 285 | s->preloaded = 0; |
040fcc81 SR |
286 | s->vmlinux = is_vmlinux(mod->name); |
287 | s->kernel = 0; | |
bd5cbced | 288 | s->export = export; |
040fcc81 SR |
289 | return s; |
290 | } | |
291 | ||
292 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 293 | unsigned int crc, enum export export) |
040fcc81 SR |
294 | { |
295 | struct symbol *s = find_symbol(name); | |
296 | ||
297 | if (!s) | |
bd5cbced | 298 | s = new_symbol(name, mod, export); |
040fcc81 SR |
299 | s->crc = crc; |
300 | s->crc_valid = 1; | |
1da177e4 LT |
301 | } |
302 | ||
5c3ead8c | 303 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
304 | { |
305 | struct stat st; | |
306 | void *map; | |
307 | int fd; | |
308 | ||
309 | fd = open(filename, O_RDONLY); | |
310 | if (fd < 0 || fstat(fd, &st) != 0) | |
311 | return NULL; | |
312 | ||
313 | *size = st.st_size; | |
314 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
315 | close(fd); | |
316 | ||
317 | if (map == MAP_FAILED) | |
318 | return NULL; | |
319 | return map; | |
320 | } | |
321 | ||
5c3ead8c SR |
322 | /** |
323 | * Return a copy of the next line in a mmap'ed file. | |
324 | * spaces in the beginning of the line is trimmed away. | |
325 | * Return a pointer to a static buffer. | |
326 | **/ | |
df578e7d | 327 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
328 | { |
329 | static char line[4096]; | |
330 | int skip = 1; | |
331 | size_t len = 0; | |
332 | signed char *p = (signed char *)file + *pos; | |
333 | char *s = line; | |
334 | ||
df578e7d | 335 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
336 | if (skip && isspace(*p)) { |
337 | p++; | |
338 | continue; | |
339 | } | |
340 | skip = 0; | |
341 | if (*p != '\n' && (*pos < size)) { | |
342 | len++; | |
343 | *s++ = *p++; | |
344 | if (len > 4095) | |
345 | break; /* Too long, stop */ | |
346 | } else { | |
347 | /* End of string */ | |
348 | *s = '\0'; | |
349 | return line; | |
350 | } | |
351 | } | |
352 | /* End of buffer */ | |
353 | return NULL; | |
354 | } | |
355 | ||
5c3ead8c | 356 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
357 | { |
358 | munmap(file, size); | |
359 | } | |
360 | ||
85bd2fdd | 361 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
362 | { |
363 | unsigned int i; | |
85bd2fdd | 364 | Elf_Ehdr *hdr; |
1da177e4 LT |
365 | Elf_Shdr *sechdrs; |
366 | Elf_Sym *sym; | |
367 | ||
368 | hdr = grab_file(filename, &info->size); | |
369 | if (!hdr) { | |
370 | perror(filename); | |
6803dc0e | 371 | exit(1); |
1da177e4 LT |
372 | } |
373 | info->hdr = hdr; | |
85bd2fdd SR |
374 | if (info->size < sizeof(*hdr)) { |
375 | /* file too small, assume this is an empty .o file */ | |
376 | return 0; | |
377 | } | |
378 | /* Is this a valid ELF file? */ | |
379 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
380 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
381 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
382 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
383 | /* Not an ELF file - silently ignore it */ | |
384 | return 0; | |
385 | } | |
1da177e4 LT |
386 | /* Fix endianness in ELF header */ |
387 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
388 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
389 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
390 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
ae4ac123 | 391 | hdr->e_type = TO_NATIVE(hdr->e_type); |
1da177e4 LT |
392 | sechdrs = (void *)hdr + hdr->e_shoff; |
393 | info->sechdrs = sechdrs; | |
394 | ||
a83710e5 PS |
395 | /* Check if file offset is correct */ |
396 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
397 | fatal("section header offset=%lu in file '%s' is bigger than " |
398 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
399 | filename, info->size); | |
a83710e5 PS |
400 | return 0; |
401 | } | |
402 | ||
1da177e4 LT |
403 | /* Fix endianness in section headers */ |
404 | for (i = 0; i < hdr->e_shnum; i++) { | |
405 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
406 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
407 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
408 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
409 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); | |
ae4ac123 AN |
410 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); |
411 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
1da177e4 LT |
412 | } |
413 | /* Find symbol table. */ | |
414 | for (i = 1; i < hdr->e_shnum; i++) { | |
415 | const char *secstrings | |
416 | = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
bd5cbced | 417 | const char *secname; |
56fc82c5 | 418 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 419 | |
56fc82c5 | 420 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
421 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
422 | "sizeof(*hrd)=%zu\n", filename, | |
423 | (unsigned long)sechdrs[i].sh_offset, | |
424 | sizeof(*hdr)); | |
85bd2fdd SR |
425 | return 0; |
426 | } | |
bd5cbced RP |
427 | secname = secstrings + sechdrs[i].sh_name; |
428 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
429 | if (nobits) |
430 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
431 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
432 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
433 | } else if (strcmp(secname, "__ksymtab") == 0) |
434 | info->export_sec = i; | |
c96fca21 SR |
435 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
436 | info->export_unused_sec = i; | |
bd5cbced RP |
437 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
438 | info->export_gpl_sec = i; | |
c96fca21 SR |
439 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
440 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
441 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
442 | info->export_gpl_future_sec = i; | |
b2e3e658 MD |
443 | else if (strcmp(secname, "__markers_strings") == 0) |
444 | info->markers_strings_sec = i; | |
bd5cbced | 445 | |
1da177e4 LT |
446 | if (sechdrs[i].sh_type != SHT_SYMTAB) |
447 | continue; | |
448 | ||
449 | info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; | |
62070fa4 | 450 | info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset |
1da177e4 | 451 | + sechdrs[i].sh_size; |
62070fa4 | 452 | info->strtab = (void *)hdr + |
1da177e4 LT |
453 | sechdrs[sechdrs[i].sh_link].sh_offset; |
454 | } | |
df578e7d | 455 | if (!info->symtab_start) |
cb80514d | 456 | fatal("%s has no symtab?\n", filename); |
df578e7d | 457 | |
1da177e4 LT |
458 | /* Fix endianness in symbols */ |
459 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
460 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
461 | sym->st_name = TO_NATIVE(sym->st_name); | |
462 | sym->st_value = TO_NATIVE(sym->st_value); | |
463 | sym->st_size = TO_NATIVE(sym->st_size); | |
464 | } | |
85bd2fdd | 465 | return 1; |
1da177e4 LT |
466 | } |
467 | ||
5c3ead8c | 468 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
469 | { |
470 | release_file(info->hdr, info->size); | |
471 | } | |
472 | ||
4d7365d6 SR |
473 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
474 | { | |
475 | /* ignore __this_module, it will be resolved shortly */ | |
476 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) | |
477 | return 1; | |
478 | /* ignore global offset table */ | |
479 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
480 | return 1; | |
481 | if (info->hdr->e_machine == EM_PPC) | |
482 | /* Special register function linked on all modules during final link of .ko */ | |
483 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
484 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
485 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
486 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
487 | return 1; | |
488 | /* Do not ignore this symbol */ | |
489 | return 0; | |
490 | } | |
491 | ||
f7b05e64 LY |
492 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
493 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" | |
1da177e4 | 494 | |
5c3ead8c SR |
495 | static void handle_modversions(struct module *mod, struct elf_info *info, |
496 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
497 | { |
498 | unsigned int crc; | |
bd5cbced | 499 | enum export export = export_from_sec(info, sym->st_shndx); |
1da177e4 LT |
500 | |
501 | switch (sym->st_shndx) { | |
502 | case SHN_COMMON: | |
cb80514d | 503 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
504 | break; |
505 | case SHN_ABS: | |
506 | /* CRC'd symbol */ | |
507 | if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { | |
508 | crc = (unsigned int) sym->st_value; | |
bd5cbced RP |
509 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
510 | export); | |
1da177e4 LT |
511 | } |
512 | break; | |
513 | case SHN_UNDEF: | |
514 | /* undefined symbol */ | |
515 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
516 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
517 | break; | |
4d7365d6 | 518 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 519 | break; |
8d529014 BC |
520 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
521 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
522 | /* add compatibility with older glibc */ | |
523 | #ifndef STT_SPARC_REGISTER | |
524 | #define STT_SPARC_REGISTER STT_REGISTER | |
525 | #endif | |
1da177e4 LT |
526 | if (info->hdr->e_machine == EM_SPARC || |
527 | info->hdr->e_machine == EM_SPARCV9) { | |
528 | /* Ignore register directives. */ | |
8d529014 | 529 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 530 | break; |
62070fa4 SR |
531 | if (symname[0] == '.') { |
532 | char *munged = strdup(symname); | |
533 | munged[0] = '_'; | |
534 | munged[1] = toupper(munged[1]); | |
535 | symname = munged; | |
536 | } | |
1da177e4 LT |
537 | } |
538 | #endif | |
62070fa4 | 539 | |
1da177e4 | 540 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
df578e7d SR |
541 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
542 | mod->unres = | |
543 | alloc_symbol(symname + | |
544 | strlen(MODULE_SYMBOL_PREFIX), | |
545 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
546 | mod->unres); | |
547 | } | |
1da177e4 LT |
548 | break; |
549 | default: | |
550 | /* All exported symbols */ | |
551 | if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { | |
bd5cbced RP |
552 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
553 | export); | |
1da177e4 LT |
554 | } |
555 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) | |
556 | mod->has_init = 1; | |
557 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) | |
558 | mod->has_cleanup = 1; | |
559 | break; | |
560 | } | |
561 | } | |
562 | ||
5c3ead8c SR |
563 | /** |
564 | * Parse tag=value strings from .modinfo section | |
565 | **/ | |
1da177e4 LT |
566 | static char *next_string(char *string, unsigned long *secsize) |
567 | { | |
568 | /* Skip non-zero chars */ | |
569 | while (string[0]) { | |
570 | string++; | |
571 | if ((*secsize)-- <= 1) | |
572 | return NULL; | |
573 | } | |
574 | ||
575 | /* Skip any zero padding. */ | |
576 | while (!string[0]) { | |
577 | string++; | |
578 | if ((*secsize)-- <= 1) | |
579 | return NULL; | |
580 | } | |
581 | return string; | |
582 | } | |
583 | ||
b817f6fe SR |
584 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
585 | const char *tag, char *info) | |
1da177e4 LT |
586 | { |
587 | char *p; | |
588 | unsigned int taglen = strlen(tag); | |
589 | unsigned long size = modinfo_len; | |
590 | ||
b817f6fe SR |
591 | if (info) { |
592 | size -= info - (char *)modinfo; | |
593 | modinfo = next_string(info, &size); | |
594 | } | |
595 | ||
1da177e4 LT |
596 | for (p = modinfo; p; p = next_string(p, &size)) { |
597 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
598 | return p + taglen + 1; | |
599 | } | |
600 | return NULL; | |
601 | } | |
602 | ||
b817f6fe SR |
603 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
604 | const char *tag) | |
605 | ||
606 | { | |
607 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
608 | } | |
609 | ||
4c8fbca5 SR |
610 | /** |
611 | * Test if string s ends in string sub | |
612 | * return 0 if match | |
613 | **/ | |
614 | static int strrcmp(const char *s, const char *sub) | |
615 | { | |
df578e7d | 616 | int slen, sublen; |
62070fa4 | 617 | |
4c8fbca5 SR |
618 | if (!s || !sub) |
619 | return 1; | |
62070fa4 | 620 | |
4c8fbca5 | 621 | slen = strlen(s); |
df578e7d | 622 | sublen = strlen(sub); |
62070fa4 | 623 | |
4c8fbca5 SR |
624 | if ((slen == 0) || (sublen == 0)) |
625 | return 1; | |
626 | ||
df578e7d SR |
627 | if (sublen > slen) |
628 | return 1; | |
4c8fbca5 | 629 | |
df578e7d | 630 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
631 | } |
632 | ||
ff13f926 SR |
633 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
634 | { | |
58fb0d4f SR |
635 | if (sym) |
636 | return elf->strtab + sym->st_name; | |
637 | else | |
f666751a | 638 | return "(unknown)"; |
ff13f926 SR |
639 | } |
640 | ||
641 | static const char *sec_name(struct elf_info *elf, int shndx) | |
642 | { | |
643 | Elf_Shdr *sechdrs = elf->sechdrs; | |
644 | return (void *)elf->hdr + | |
645 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
646 | sechdrs[shndx].sh_name; | |
647 | } | |
648 | ||
649 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
650 | { | |
651 | return (void *)elf->hdr + | |
652 | elf->sechdrs[elf->hdr->e_shstrndx].sh_offset + | |
653 | sechdr->sh_name; | |
654 | } | |
655 | ||
10668220 SR |
656 | /* if sym is empty or point to a string |
657 | * like ".[0-9]+" then return 1. | |
658 | * This is the optional prefix added by ld to some sections | |
659 | */ | |
660 | static int number_prefix(const char *sym) | |
661 | { | |
662 | if (*sym++ == '\0') | |
663 | return 1; | |
664 | if (*sym != '.') | |
665 | return 0; | |
666 | do { | |
667 | char c = *sym++; | |
668 | if (c < '0' || c > '9') | |
669 | return 0; | |
670 | } while (*sym); | |
671 | return 1; | |
672 | } | |
673 | ||
674 | /* The pattern is an array of simple patterns. | |
675 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 676 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
677 | * "foo*" will match a string that begins with "foo" |
678 | * "foo$" will match a string equal to "foo" or "foo.1" | |
679 | * where the '1' can be any number including several digits. | |
680 | * The $ syntax is for sections where ld append a dot number | |
681 | * to make section name unique. | |
682 | */ | |
683 | int match(const char *sym, const char * const pat[]) | |
684 | { | |
685 | const char *p; | |
686 | while (*pat) { | |
687 | p = *pat++; | |
688 | const char *endp = p + strlen(p) - 1; | |
689 | ||
6c5bd235 SR |
690 | /* "*foo" */ |
691 | if (*p == '*') { | |
692 | if (strrcmp(sym, p + 1) == 0) | |
693 | return 1; | |
694 | } | |
10668220 | 695 | /* "foo*" */ |
6c5bd235 | 696 | else if (*endp == '*') { |
10668220 SR |
697 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
698 | return 1; | |
699 | } | |
700 | /* "foo$" */ | |
701 | else if (*endp == '$') { | |
702 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
703 | if (number_prefix(sym + strlen(p) - 1)) | |
704 | return 1; | |
705 | } | |
706 | } | |
707 | /* no wildcards */ | |
708 | else { | |
709 | if (strcmp(p, sym) == 0) | |
710 | return 1; | |
711 | } | |
712 | } | |
713 | /* no match */ | |
714 | return 0; | |
715 | } | |
716 | ||
10668220 SR |
717 | /* sections that we do not want to do full section mismatch check on */ |
718 | static const char *section_white_list[] = | |
719 | { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL }; | |
720 | ||
e241a630 SR |
721 | /* |
722 | * Is this section one we do not want to check? | |
723 | * This is often debug sections. | |
724 | * If we are going to check this section then | |
725 | * test if section name ends with a dot and a number. | |
726 | * This is used to find sections where the linker have | |
727 | * appended a dot-number to make the name unique. | |
728 | * The cause of this is often a section specified in assembler | |
729 | * without "ax" / "aw" and the same section used in .c | |
730 | * code where gcc add these. | |
731 | */ | |
732 | static int check_section(const char *modname, const char *sec) | |
733 | { | |
734 | const char *e = sec + strlen(sec) - 1; | |
735 | if (match(sec, section_white_list)) | |
736 | return 1; | |
737 | ||
738 | if (*e && isdigit(*e)) { | |
739 | /* consume all digits */ | |
740 | while (*e && e != sec && isdigit(*e)) | |
741 | e--; | |
fd1db0a3 | 742 | if (*e == '.' && !strstr(sec, ".linkonce")) { |
e241a630 SR |
743 | warn("%s (%s): unexpected section name.\n" |
744 | "The (.[number]+) following section name are " | |
745 | "ld generated and not expected.\n" | |
746 | "Did you forget to use \"ax\"/\"aw\" " | |
747 | "in a .S file?\n" | |
748 | "Note that for example <linux/init.h> contains\n" | |
749 | "section definitions for use in .S files.\n\n", | |
750 | modname, sec); | |
751 | } | |
752 | } | |
753 | return 0; | |
754 | } | |
755 | ||
756 | ||
757 | ||
eb8f6890 SR |
758 | #define ALL_INIT_DATA_SECTIONS \ |
759 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" | |
760 | #define ALL_EXIT_DATA_SECTIONS \ | |
761 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" | |
10668220 | 762 | |
eb8f6890 SR |
763 | #define ALL_INIT_TEXT_SECTIONS \ |
764 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" | |
765 | #define ALL_EXIT_TEXT_SECTIONS \ | |
766 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" | |
10668220 | 767 | |
eb8f6890 SR |
768 | #define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS |
769 | #define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS | |
10668220 | 770 | |
6c5bd235 | 771 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
772 | #define TEXT_SECTIONS ".text$" |
773 | ||
eb8f6890 SR |
774 | #define INIT_SECTIONS ".init.data$", ".init.text$" |
775 | #define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$" | |
776 | #define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$" | |
777 | #define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$" | |
778 | ||
779 | #define EXIT_SECTIONS ".exit.data$", ".exit.text$" | |
780 | #define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$" | |
781 | #define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$" | |
782 | #define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$" | |
783 | ||
6c5bd235 | 784 | /* init data sections */ |
eb8f6890 | 785 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
786 | |
787 | /* all init sections */ | |
eb8f6890 | 788 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
789 | |
790 | /* All init and exit sections (code + data) */ | |
791 | static const char *init_exit_sections[] = | |
eb8f6890 | 792 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
793 | |
794 | /* data section */ | |
795 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
796 | ||
797 | /* sections that may refer to an init/exit section with no warning */ | |
798 | static const char *initref_sections[] = | |
799 | { | |
800 | ".text.init.refok*", | |
801 | ".exit.text.refok*", | |
802 | ".data.init.refok*", | |
803 | NULL | |
804 | }; | |
805 | ||
806 | ||
807 | /* symbols in .data that may refer to init/exit sections */ | |
808 | static const char *symbol_white_list[] = | |
809 | { | |
810 | "*driver", | |
811 | "*_template", /* scsi uses *_template a lot */ | |
812 | "*_timer", /* arm uses ops structures named _timer a lot */ | |
813 | "*_sht", /* scsi also used *_sht to some extent */ | |
814 | "*_ops", | |
815 | "*_probe", | |
816 | "*_probe_one", | |
817 | "*_console", | |
818 | NULL | |
819 | }; | |
820 | ||
821 | static const char *head_sections[] = { ".head.text*", NULL }; | |
822 | static const char *linker_symbols[] = | |
823 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
824 | ||
588ccd73 SR |
825 | enum mismatch { |
826 | NO_MISMATCH, | |
827 | TEXT_TO_INIT, | |
828 | DATA_TO_INIT, | |
829 | TEXT_TO_EXIT, | |
830 | DATA_TO_EXIT, | |
831 | XXXINIT_TO_INIT, | |
832 | XXXEXIT_TO_EXIT, | |
833 | INIT_TO_EXIT, | |
834 | EXIT_TO_INIT, | |
835 | EXPORT_TO_INIT_EXIT, | |
836 | }; | |
837 | ||
10668220 SR |
838 | struct sectioncheck { |
839 | const char *fromsec[20]; | |
840 | const char *tosec[20]; | |
588ccd73 | 841 | enum mismatch mismatch; |
10668220 SR |
842 | }; |
843 | ||
844 | const struct sectioncheck sectioncheck[] = { | |
845 | /* Do not reference init/exit code/data from | |
846 | * normal code and data | |
847 | */ | |
848 | { | |
588ccd73 SR |
849 | .fromsec = { TEXT_SECTIONS, NULL }, |
850 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
851 | .mismatch = TEXT_TO_INIT, | |
852 | }, | |
853 | { | |
854 | .fromsec = { DATA_SECTIONS, NULL }, | |
855 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
856 | .mismatch = DATA_TO_INIT, | |
857 | }, | |
858 | { | |
859 | .fromsec = { TEXT_SECTIONS, NULL }, | |
860 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
861 | .mismatch = TEXT_TO_EXIT, | |
862 | }, | |
863 | { | |
864 | .fromsec = { DATA_SECTIONS, NULL }, | |
865 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
866 | .mismatch = DATA_TO_EXIT, | |
eb8f6890 SR |
867 | }, |
868 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ | |
869 | { | |
870 | .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL }, | |
588ccd73 SR |
871 | .tosec = { INIT_SECTIONS, NULL }, |
872 | .mismatch = XXXINIT_TO_INIT, | |
eb8f6890 SR |
873 | }, |
874 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ | |
875 | { | |
876 | .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL }, | |
588ccd73 SR |
877 | .tosec = { EXIT_SECTIONS, NULL }, |
878 | .mismatch = XXXEXIT_TO_EXIT, | |
10668220 SR |
879 | }, |
880 | /* Do not use exit code/data from init code */ | |
881 | { | |
eb8f6890 SR |
882 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
883 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
588ccd73 | 884 | .mismatch = INIT_TO_EXIT, |
10668220 SR |
885 | }, |
886 | /* Do not use init code/data from exit code */ | |
887 | { | |
eb8f6890 | 888 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 SR |
889 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
890 | .mismatch = EXIT_TO_INIT, | |
10668220 SR |
891 | }, |
892 | /* Do not export init/exit functions or data */ | |
893 | { | |
894 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 895 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
588ccd73 | 896 | .mismatch = EXPORT_TO_INIT_EXIT |
10668220 SR |
897 | } |
898 | }; | |
899 | ||
900 | static int section_mismatch(const char *fromsec, const char *tosec) | |
901 | { | |
902 | int i; | |
903 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
904 | const struct sectioncheck *check = §ioncheck[0]; | |
905 | ||
906 | for (i = 0; i < elems; i++) { | |
907 | if (match(fromsec, check->fromsec) && | |
908 | match(tosec, check->tosec)) | |
588ccd73 | 909 | return check->mismatch; |
10668220 SR |
910 | check++; |
911 | } | |
588ccd73 | 912 | return NO_MISMATCH; |
10668220 SR |
913 | } |
914 | ||
4c8fbca5 SR |
915 | /** |
916 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e SR |
917 | * |
918 | * Pattern 0: | |
919 | * Do not warn if funtion/data are marked with __init_refok/__initdata_refok. | |
920 | * The pattern is identified by: | |
cb7e51d8 | 921 | * fromsec = .text.init.refok* | .data.init.refok* |
0e0d314e | 922 | * |
4c8fbca5 SR |
923 | * Pattern 1: |
924 | * If a module parameter is declared __initdata and permissions=0 | |
925 | * then this is legal despite the warning generated. | |
926 | * We cannot see value of permissions here, so just ignore | |
927 | * this pattern. | |
928 | * The pattern is identified by: | |
929 | * tosec = .init.data | |
9209aed0 | 930 | * fromsec = .data* |
4c8fbca5 | 931 | * atsym =__param* |
62070fa4 | 932 | * |
4c8fbca5 | 933 | * Pattern 2: |
72ee59b5 | 934 | * Many drivers utilise a *driver container with references to |
4c8fbca5 SR |
935 | * add, remove, probe functions etc. |
936 | * These functions may often be marked __init and we do not want to | |
937 | * warn here. | |
938 | * the pattern is identified by: | |
83cda2bb SR |
939 | * tosec = init or exit section |
940 | * fromsec = data section | |
df578e7d SR |
941 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
942 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
943 | * |
944 | * Pattern 3: | |
9bf8cb9b SR |
945 | * Whitelist all refereces from .text.head to .init.data |
946 | * Whitelist all refereces from .text.head to .init.text | |
947 | * | |
1d8af559 | 948 | * Pattern 4: |
ee6a8545 VG |
949 | * Some symbols belong to init section but still it is ok to reference |
950 | * these from non-init sections as these symbols don't have any memory | |
951 | * allocated for them and symbol address and value are same. So even | |
952 | * if init section is freed, its ok to reference those symbols. | |
953 | * For ex. symbols marking the init section boundaries. | |
954 | * This pattern is identified by | |
955 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 956 | * |
4c8fbca5 | 957 | **/ |
58fb0d4f SR |
958 | static int secref_whitelist(const char *fromsec, const char *fromsym, |
959 | const char *tosec, const char *tosym) | |
4c8fbca5 | 960 | { |
0e0d314e | 961 | /* Check for pattern 0 */ |
6c5bd235 | 962 | if (match(fromsec, initref_sections)) |
58fb0d4f | 963 | return 0; |
0e0d314e | 964 | |
4c8fbca5 | 965 | /* Check for pattern 1 */ |
6c5bd235 SR |
966 | if (match(tosec, init_data_sections) && |
967 | match(fromsec, data_sections) && | |
58fb0d4f SR |
968 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
969 | return 0; | |
4c8fbca5 SR |
970 | |
971 | /* Check for pattern 2 */ | |
6c5bd235 SR |
972 | if (match(tosec, init_exit_sections) && |
973 | match(fromsec, data_sections) && | |
58fb0d4f SR |
974 | match(fromsym, symbol_white_list)) |
975 | return 0; | |
4c8fbca5 | 976 | |
9bf8cb9b | 977 | /* Check for pattern 3 */ |
6c5bd235 SR |
978 | if (match(fromsec, head_sections) && |
979 | match(tosec, init_sections)) | |
58fb0d4f | 980 | return 0; |
9bf8cb9b | 981 | |
1d8af559 | 982 | /* Check for pattern 4 */ |
58fb0d4f SR |
983 | if (match(tosym, linker_symbols)) |
984 | return 0; | |
9bf8cb9b | 985 | |
58fb0d4f | 986 | return 1; |
4c8fbca5 SR |
987 | } |
988 | ||
93684d3b SR |
989 | /** |
990 | * Find symbol based on relocation record info. | |
991 | * In some cases the symbol supplied is a valid symbol so | |
992 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
993 | * In other cases the symbol needs to be looked up in the symbol table | |
994 | * based on section and address. | |
995 | * **/ | |
9ad21c3f | 996 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
997 | Elf_Sym *relsym) |
998 | { | |
999 | Elf_Sym *sym; | |
9ad21c3f SR |
1000 | Elf_Sym *near = NULL; |
1001 | Elf64_Sword distance = 20; | |
1002 | Elf64_Sword d; | |
93684d3b SR |
1003 | |
1004 | if (relsym->st_name != 0) | |
1005 | return relsym; | |
1006 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { | |
1007 | if (sym->st_shndx != relsym->st_shndx) | |
1008 | continue; | |
ae4ac123 AN |
1009 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1010 | continue; | |
93684d3b SR |
1011 | if (sym->st_value == addr) |
1012 | return sym; | |
9ad21c3f SR |
1013 | /* Find a symbol nearby - addr are maybe negative */ |
1014 | d = sym->st_value - addr; | |
1015 | if (d < 0) | |
1016 | d = addr - sym->st_value; | |
1017 | if (d < distance) { | |
1018 | distance = d; | |
1019 | near = sym; | |
1020 | } | |
93684d3b | 1021 | } |
9ad21c3f SR |
1022 | /* We need a close match */ |
1023 | if (distance < 20) | |
1024 | return near; | |
1025 | else | |
1026 | return NULL; | |
93684d3b SR |
1027 | } |
1028 | ||
da68d61f DB |
1029 | static inline int is_arm_mapping_symbol(const char *str) |
1030 | { | |
1031 | return str[0] == '$' && strchr("atd", str[1]) | |
1032 | && (str[2] == '\0' || str[2] == '.'); | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1037 | * one of the magic symbols emitted used by current ARM tools. | |
1038 | * | |
1039 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1040 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1041 | * only by merging __exit and __init sections into __text, bloating | |
1042 | * the kernel (which is especially evil on embedded platforms). | |
1043 | */ | |
1044 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1045 | { | |
1046 | const char *name = elf->strtab + sym->st_name; | |
1047 | ||
1048 | if (!name || !strlen(name)) | |
1049 | return 0; | |
1050 | return !is_arm_mapping_symbol(name); | |
1051 | } | |
1052 | ||
b39927cf | 1053 | /* |
43c74d17 SR |
1054 | * Find symbols before or equal addr and after addr - in the section sec. |
1055 | * If we find two symbols with equal offset prefer one with a valid name. | |
1056 | * The ELF format may have a better way to detect what type of symbol | |
1057 | * it is, but this works for now. | |
b39927cf | 1058 | **/ |
157c23c8 SR |
1059 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1060 | const char *sec) | |
b39927cf SR |
1061 | { |
1062 | Elf_Sym *sym; | |
157c23c8 | 1063 | Elf_Sym *near = NULL; |
157c23c8 | 1064 | Elf_Addr distance = ~0; |
62070fa4 | 1065 | |
b39927cf SR |
1066 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1067 | const char *symsec; | |
1068 | ||
1069 | if (sym->st_shndx >= SHN_LORESERVE) | |
1070 | continue; | |
ff13f926 | 1071 | symsec = sec_name(elf, sym->st_shndx); |
b39927cf SR |
1072 | if (strcmp(symsec, sec) != 0) |
1073 | continue; | |
da68d61f DB |
1074 | if (!is_valid_name(elf, sym)) |
1075 | continue; | |
b39927cf | 1076 | if (sym->st_value <= addr) { |
157c23c8 SR |
1077 | if ((addr - sym->st_value) < distance) { |
1078 | distance = addr - sym->st_value; | |
1079 | near = sym; | |
1080 | } else if ((addr - sym->st_value) == distance) { | |
1081 | near = sym; | |
43c74d17 | 1082 | } |
b39927cf SR |
1083 | } |
1084 | } | |
157c23c8 | 1085 | return near; |
b39927cf SR |
1086 | } |
1087 | ||
588ccd73 SR |
1088 | /* |
1089 | * Convert a section name to the function/data attribute | |
1090 | * .init.text => __init | |
1091 | * .cpuinit.data => __cpudata | |
1092 | * .memexitconst => __memconst | |
1093 | * etc. | |
1094 | */ | |
1095 | static char *sec2annotation(const char *s) | |
1096 | { | |
1097 | if (match(s, init_exit_sections)) { | |
1098 | char *p = malloc(20); | |
1099 | char *r = p; | |
1100 | ||
1101 | *p++ = '_'; | |
1102 | *p++ = '_'; | |
1103 | if (*s == '.') | |
1104 | s++; | |
1105 | while (*s && *s != '.') | |
1106 | *p++ = *s++; | |
1107 | *p = '\0'; | |
1108 | if (*s == '.') | |
1109 | s++; | |
1110 | if (strstr(s, "rodata") != NULL) | |
1111 | strcat(p, "const "); | |
1112 | else if (strstr(s, "data") != NULL) | |
1113 | strcat(p, "data "); | |
1114 | else | |
1115 | strcat(p, " "); | |
1116 | return r; /* we leak her but we do not care */ | |
1117 | } else { | |
1118 | return ""; | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | static int is_function(Elf_Sym *sym) | |
1123 | { | |
1124 | if (sym) | |
1125 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1126 | else | |
f666751a | 1127 | return -1; |
588ccd73 SR |
1128 | } |
1129 | ||
58fb0d4f | 1130 | /* |
b39927cf SR |
1131 | * Print a warning about a section mismatch. |
1132 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1133 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1134 | */ |
588ccd73 | 1135 | static void report_sec_mismatch(const char *modname, enum mismatch mismatch, |
58fb0d4f SR |
1136 | const char *fromsec, |
1137 | unsigned long long fromaddr, | |
1138 | const char *fromsym, | |
588ccd73 SR |
1139 | int from_is_func, |
1140 | const char *tosec, const char *tosym, | |
1141 | int to_is_func) | |
1142 | { | |
1143 | const char *from, *from_p; | |
1144 | const char *to, *to_p; | |
f666751a SR |
1145 | |
1146 | switch (from_is_func) { | |
1147 | case 0: from = "variable"; from_p = ""; break; | |
1148 | case 1: from = "function"; from_p = "()"; break; | |
1149 | default: from = "(unknown reference)"; from_p = ""; break; | |
1150 | } | |
1151 | switch (to_is_func) { | |
1152 | case 0: to = "variable"; to_p = ""; break; | |
1153 | case 1: to = "function"; to_p = "()"; break; | |
1154 | default: to = "(unknown reference)"; to_p = ""; break; | |
1155 | } | |
588ccd73 | 1156 | |
e5f95c8b SR |
1157 | sec_mismatch_count++; |
1158 | if (!sec_mismatch_verbose) | |
1159 | return; | |
1160 | ||
7c0ac495 GU |
1161 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1162 | "to the %s %s:%s%s\n", | |
1163 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1164 | tosym, to_p); | |
588ccd73 | 1165 | |
588ccd73 SR |
1166 | switch (mismatch) { |
1167 | case TEXT_TO_INIT: | |
1168 | fprintf(stderr, | |
f666751a | 1169 | "The function %s%s() references\n" |
588ccd73 SR |
1170 | "the %s %s%s%s.\n" |
1171 | "This is often because %s lacks a %s\n" | |
1172 | "annotation or the annotation of %s is wrong.\n", | |
1173 | sec2annotation(fromsec), fromsym, | |
1174 | to, sec2annotation(tosec), tosym, to_p, | |
1175 | fromsym, sec2annotation(tosec), tosym); | |
1176 | break; | |
1177 | case DATA_TO_INIT: { | |
1178 | const char **s = symbol_white_list; | |
1179 | fprintf(stderr, | |
1180 | "The variable %s references\n" | |
1181 | "the %s %s%s%s\n" | |
1182 | "If the reference is valid then annotate the\n" | |
1183 | "variable with __init* (see linux/init.h) " | |
1184 | "or name the variable:\n", | |
1185 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1186 | while (*s) | |
1187 | fprintf(stderr, "%s, ", *s++); | |
1188 | fprintf(stderr, "\n"); | |
1189 | break; | |
58fb0d4f | 1190 | } |
588ccd73 SR |
1191 | case TEXT_TO_EXIT: |
1192 | fprintf(stderr, | |
1193 | "The function %s() references a %s in an exit section.\n" | |
1194 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1195 | "and the fix is to remove the %sannotation of %s.\n", | |
1196 | fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym); | |
1197 | break; | |
1198 | case DATA_TO_EXIT: { | |
1199 | const char **s = symbol_white_list; | |
1200 | fprintf(stderr, | |
1201 | "The variable %s references\n" | |
1202 | "the %s %s%s%s\n" | |
1203 | "If the reference is valid then annotate the\n" | |
1204 | "variable with __exit* (see linux/init.h) or " | |
1205 | "name the variable:\n", | |
1206 | fromsym, to, sec2annotation(tosec), tosym, to_p); | |
1207 | while (*s) | |
1208 | fprintf(stderr, "%s, ", *s++); | |
1209 | fprintf(stderr, "\n"); | |
1210 | break; | |
1211 | } | |
1212 | case XXXINIT_TO_INIT: | |
1213 | case XXXEXIT_TO_EXIT: | |
1214 | fprintf(stderr, | |
1215 | "The %s %s%s%s references\n" | |
1216 | "a %s %s%s%s.\n" | |
1217 | "If %s is only used by %s then\n" | |
1218 | "annotate %s with a matching annotation.\n", | |
1219 | from, sec2annotation(fromsec), fromsym, from_p, | |
1220 | to, sec2annotation(tosec), tosym, to_p, | |
b1d2675a | 1221 | tosym, fromsym, tosym); |
588ccd73 SR |
1222 | break; |
1223 | case INIT_TO_EXIT: | |
1224 | fprintf(stderr, | |
1225 | "The %s %s%s%s references\n" | |
1226 | "a %s %s%s%s.\n" | |
1227 | "This is often seen when error handling " | |
1228 | "in the init function\n" | |
1229 | "uses functionality in the exit path.\n" | |
1230 | "The fix is often to remove the %sannotation of\n" | |
1231 | "%s%s so it may be used outside an exit section.\n", | |
1232 | from, sec2annotation(fromsec), fromsym, from_p, | |
1233 | to, sec2annotation(tosec), tosym, to_p, | |
1234 | sec2annotation(tosec), tosym, to_p); | |
1235 | break; | |
1236 | case EXIT_TO_INIT: | |
1237 | fprintf(stderr, | |
1238 | "The %s %s%s%s references\n" | |
1239 | "a %s %s%s%s.\n" | |
1240 | "This is often seen when error handling " | |
1241 | "in the exit function\n" | |
1242 | "uses functionality in the init path.\n" | |
1243 | "The fix is often to remove the %sannotation of\n" | |
1244 | "%s%s so it may be used outside an init section.\n", | |
1245 | from, sec2annotation(fromsec), fromsym, from_p, | |
1246 | to, sec2annotation(tosec), tosym, to_p, | |
1247 | sec2annotation(tosec), tosym, to_p); | |
1248 | break; | |
1249 | case EXPORT_TO_INIT_EXIT: | |
1250 | fprintf(stderr, | |
1251 | "The symbol %s is exported and annotated %s\n" | |
1252 | "Fix this by removing the %sannotation of %s " | |
1253 | "or drop the export.\n", | |
1254 | tosym, sec2annotation(tosec), sec2annotation(tosec), tosym); | |
1255 | case NO_MISMATCH: | |
1256 | /* To get warnings on missing members */ | |
1257 | break; | |
1258 | } | |
1259 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1260 | } |
1261 | ||
1262 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1263 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1264 | { | |
1265 | const char *tosec; | |
588ccd73 | 1266 | enum mismatch mismatch; |
58fb0d4f SR |
1267 | |
1268 | tosec = sec_name(elf, sym->st_shndx); | |
588ccd73 SR |
1269 | mismatch = section_mismatch(fromsec, tosec); |
1270 | if (mismatch != NO_MISMATCH) { | |
1271 | Elf_Sym *to; | |
1272 | Elf_Sym *from; | |
58fb0d4f | 1273 | const char *tosym; |
588ccd73 | 1274 | const char *fromsym; |
58fb0d4f | 1275 | |
588ccd73 SR |
1276 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1277 | fromsym = sym_name(elf, from); | |
1278 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1279 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1280 | |
1281 | /* check whitelist - we may ignore it */ | |
1282 | if (secref_whitelist(fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1283 | report_sec_mismatch(modname, mismatch, |
1284 | fromsec, r->r_offset, fromsym, | |
1285 | is_function(from), tosec, tosym, | |
1286 | is_function(to)); | |
58fb0d4f | 1287 | } |
b39927cf SR |
1288 | } |
1289 | } | |
1290 | ||
ae4ac123 | 1291 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1292 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1293 | { |
1294 | Elf_Shdr *sechdrs = elf->sechdrs; | |
5b24c071 | 1295 | int section = sechdr->sh_info; |
ae4ac123 AN |
1296 | |
1297 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
1298 | (r->r_offset - sechdrs[section].sh_addr); | |
1299 | } | |
1300 | ||
5b24c071 | 1301 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1302 | { |
1303 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1304 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1305 | |
1306 | switch (r_typ) { | |
1307 | case R_386_32: | |
1308 | r->r_addend = TO_NATIVE(*location); | |
1309 | break; | |
1310 | case R_386_PC32: | |
1311 | r->r_addend = TO_NATIVE(*location) + 4; | |
1312 | /* For CONFIG_RELOCATABLE=y */ | |
1313 | if (elf->hdr->e_type == ET_EXEC) | |
1314 | r->r_addend += r->r_offset; | |
1315 | break; | |
1316 | } | |
1317 | return 0; | |
1318 | } | |
1319 | ||
5b24c071 | 1320 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1321 | { |
1322 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1323 | ||
1324 | switch (r_typ) { | |
1325 | case R_ARM_ABS32: | |
1326 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1327 | r->r_addend = (int)(long) |
1328 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1329 | break; |
1330 | case R_ARM_PC24: | |
1331 | /* From ARM ABI: ((S + A) | T) - P */ | |
df578e7d | 1332 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1333 | sechdr->sh_offset + |
1334 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1335 | break; |
1336 | default: | |
1337 | return 1; | |
1338 | } | |
1339 | return 0; | |
1340 | } | |
1341 | ||
5b24c071 | 1342 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1343 | { |
1344 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1345 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1346 | unsigned int inst; |
1347 | ||
1348 | if (r_typ == R_MIPS_HI16) | |
1349 | return 1; /* skip this */ | |
1350 | inst = TO_NATIVE(*location); | |
1351 | switch (r_typ) { | |
1352 | case R_MIPS_LO16: | |
1353 | r->r_addend = inst & 0xffff; | |
1354 | break; | |
1355 | case R_MIPS_26: | |
1356 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1357 | break; | |
1358 | case R_MIPS_32: | |
1359 | r->r_addend = inst; | |
1360 | break; | |
1361 | } | |
1362 | return 0; | |
1363 | } | |
1364 | ||
5b24c071 | 1365 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1366 | Elf_Shdr *sechdr) |
5b24c071 SR |
1367 | { |
1368 | Elf_Sym *sym; | |
1369 | Elf_Rela *rela; | |
1370 | Elf_Rela r; | |
1371 | unsigned int r_sym; | |
1372 | const char *fromsec; | |
5b24c071 | 1373 | |
ff13f926 | 1374 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1375 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1376 | ||
ff13f926 | 1377 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1378 | fromsec += strlen(".rela"); |
1379 | /* if from section (name) is know good then skip it */ | |
e241a630 | 1380 | if (check_section(modname, fromsec)) |
5b24c071 | 1381 | return; |
e241a630 | 1382 | |
5b24c071 SR |
1383 | for (rela = start; rela < stop; rela++) { |
1384 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1385 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1386 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1387 | unsigned int r_typ; |
1388 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1389 | r_sym = TO_NATIVE(r_sym); | |
1390 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1391 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1392 | } else { | |
1393 | r.r_info = TO_NATIVE(rela->r_info); | |
1394 | r_sym = ELF_R_SYM(r.r_info); | |
1395 | } | |
1396 | #else | |
1397 | r.r_info = TO_NATIVE(rela->r_info); | |
1398 | r_sym = ELF_R_SYM(r.r_info); | |
1399 | #endif | |
1400 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1401 | sym = elf->symtab_start + r_sym; | |
1402 | /* Skip special sections */ | |
1403 | if (sym->st_shndx >= SHN_LORESERVE) | |
1404 | continue; | |
58fb0d4f | 1405 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1406 | } |
1407 | } | |
1408 | ||
1409 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1410 | Elf_Shdr *sechdr) |
5b24c071 SR |
1411 | { |
1412 | Elf_Sym *sym; | |
1413 | Elf_Rel *rel; | |
1414 | Elf_Rela r; | |
1415 | unsigned int r_sym; | |
1416 | const char *fromsec; | |
5b24c071 | 1417 | |
ff13f926 | 1418 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1419 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1420 | ||
ff13f926 | 1421 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1422 | fromsec += strlen(".rel"); |
1423 | /* if from section (name) is know good then skip it */ | |
e241a630 | 1424 | if (check_section(modname, fromsec)) |
5b24c071 SR |
1425 | return; |
1426 | ||
1427 | for (rel = start; rel < stop; rel++) { | |
1428 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1429 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1430 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1431 | unsigned int r_typ; |
1432 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1433 | r_sym = TO_NATIVE(r_sym); | |
1434 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1435 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1436 | } else { | |
1437 | r.r_info = TO_NATIVE(rel->r_info); | |
1438 | r_sym = ELF_R_SYM(r.r_info); | |
1439 | } | |
1440 | #else | |
1441 | r.r_info = TO_NATIVE(rel->r_info); | |
1442 | r_sym = ELF_R_SYM(r.r_info); | |
1443 | #endif | |
1444 | r.r_addend = 0; | |
ff13f926 | 1445 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1446 | case EM_386: |
1447 | if (addend_386_rel(elf, sechdr, &r)) | |
1448 | continue; | |
1449 | break; | |
1450 | case EM_ARM: | |
1451 | if (addend_arm_rel(elf, sechdr, &r)) | |
1452 | continue; | |
1453 | break; | |
1454 | case EM_MIPS: | |
1455 | if (addend_mips_rel(elf, sechdr, &r)) | |
1456 | continue; | |
1457 | break; | |
1458 | } | |
1459 | sym = elf->symtab_start + r_sym; | |
1460 | /* Skip special sections */ | |
1461 | if (sym->st_shndx >= SHN_LORESERVE) | |
1462 | continue; | |
58fb0d4f | 1463 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1464 | } |
1465 | } | |
1466 | ||
b39927cf SR |
1467 | /** |
1468 | * A module includes a number of sections that are discarded | |
1469 | * either when loaded or when used as built-in. | |
1470 | * For loaded modules all functions marked __init and all data | |
1471 | * marked __initdata will be discarded when the module has been intialized. | |
1472 | * Likewise for modules used built-in the sections marked __exit | |
1473 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1474 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1475 | * The check_sec_ref() function traverses all relocation records |
1476 | * to find all references to a section that reference a section that will | |
1477 | * be discarded and warns about it. | |
1478 | **/ | |
1479 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1480 | struct elf_info *elf) |
b39927cf SR |
1481 | { |
1482 | int i; | |
b39927cf | 1483 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1484 | |
b39927cf | 1485 | /* Walk through all sections */ |
ff13f926 | 1486 | for (i = 0; i < elf->hdr->e_shnum; i++) { |
b39927cf | 1487 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1488 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1489 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1490 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1491 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1492 | } |
1493 | } | |
1494 | ||
b2e3e658 MD |
1495 | static void get_markers(struct elf_info *info, struct module *mod) |
1496 | { | |
1497 | const Elf_Shdr *sh = &info->sechdrs[info->markers_strings_sec]; | |
1498 | const char *strings = (const char *) info->hdr + sh->sh_offset; | |
1499 | const Elf_Sym *sym, *first_sym, *last_sym; | |
1500 | size_t n; | |
1501 | ||
1502 | if (!info->markers_strings_sec) | |
1503 | return; | |
1504 | ||
1505 | /* | |
1506 | * First count the strings. We look for all the symbols defined | |
1507 | * in the __markers_strings section named __mstrtab_*. For | |
1508 | * these local names, the compiler puts a random .NNN suffix on, | |
1509 | * so the names don't correspond exactly. | |
1510 | */ | |
1511 | first_sym = last_sym = NULL; | |
1512 | n = 0; | |
1513 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) | |
1514 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT && | |
1515 | sym->st_shndx == info->markers_strings_sec && | |
1516 | !strncmp(info->strtab + sym->st_name, | |
1517 | "__mstrtab_", sizeof "__mstrtab_" - 1)) { | |
1518 | if (first_sym == NULL) | |
1519 | first_sym = sym; | |
1520 | last_sym = sym; | |
1521 | ++n; | |
1522 | } | |
1523 | ||
1524 | if (n == 0) | |
1525 | return; | |
1526 | ||
1527 | /* | |
1528 | * Now collect each name and format into a line for the output. | |
1529 | * Lines look like: | |
1530 | * marker_name vmlinux marker %s format %d | |
1531 | * The format string after the second \t can use whitespace. | |
1532 | */ | |
1533 | mod->markers = NOFAIL(malloc(sizeof mod->markers[0] * n)); | |
1534 | mod->nmarkers = n; | |
1535 | ||
1536 | n = 0; | |
1537 | for (sym = first_sym; sym <= last_sym; sym++) | |
1538 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT && | |
1539 | sym->st_shndx == info->markers_strings_sec && | |
1540 | !strncmp(info->strtab + sym->st_name, | |
1541 | "__mstrtab_", sizeof "__mstrtab_" - 1)) { | |
1542 | const char *name = strings + sym->st_value; | |
1543 | const char *fmt = strchr(name, '\0') + 1; | |
1544 | char *line = NULL; | |
1545 | asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt); | |
1546 | NOFAIL(line); | |
1547 | mod->markers[n++] = line; | |
1548 | } | |
1549 | } | |
1550 | ||
5c3ead8c | 1551 | static void read_symbols(char *modname) |
1da177e4 LT |
1552 | { |
1553 | const char *symname; | |
1554 | char *version; | |
b817f6fe | 1555 | char *license; |
1da177e4 LT |
1556 | struct module *mod; |
1557 | struct elf_info info = { }; | |
1558 | Elf_Sym *sym; | |
1559 | ||
85bd2fdd SR |
1560 | if (!parse_elf(&info, modname)) |
1561 | return; | |
1da177e4 LT |
1562 | |
1563 | mod = new_module(modname); | |
1564 | ||
1565 | /* When there's no vmlinux, don't print warnings about | |
1566 | * unresolved symbols (since there'll be too many ;) */ | |
1567 | if (is_vmlinux(modname)) { | |
1da177e4 | 1568 | have_vmlinux = 1; |
1da177e4 LT |
1569 | mod->skip = 1; |
1570 | } | |
1571 | ||
b817f6fe | 1572 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1573 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1574 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1575 | "see include/linux/module.h for " | |
1576 | "more information\n", modname); | |
b817f6fe SR |
1577 | while (license) { |
1578 | if (license_is_gpl_compatible(license)) | |
1579 | mod->gpl_compatible = 1; | |
1580 | else { | |
1581 | mod->gpl_compatible = 0; | |
1582 | break; | |
1583 | } | |
1584 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1585 | "license", license); | |
1586 | } | |
1587 | ||
1da177e4 LT |
1588 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1589 | symname = info.strtab + sym->st_name; | |
1590 | ||
1591 | handle_modversions(mod, &info, sym, symname); | |
1592 | handle_moddevtable(mod, &info, sym, symname); | |
1593 | } | |
d1f25e66 | 1594 | if (!is_vmlinux(modname) || |
10668220 SR |
1595 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1596 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1597 | |
1598 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1599 | if (version) | |
1600 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1601 | version - (char *)info.hdr); | |
1602 | if (version || (all_versions && !is_vmlinux(modname))) | |
1603 | get_src_version(modname, mod->srcversion, | |
1604 | sizeof(mod->srcversion)-1); | |
1605 | ||
b2e3e658 MD |
1606 | get_markers(&info, mod); |
1607 | ||
1da177e4 LT |
1608 | parse_elf_finish(&info); |
1609 | ||
8c8ef42a | 1610 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1611 | * never passed as an argument to an exported function, so |
1612 | * the automatic versioning doesn't pick it up, but it's really | |
1613 | * important anyhow */ | |
1614 | if (modversions) | |
8c8ef42a | 1615 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1616 | } |
1617 | ||
1618 | #define SZ 500 | |
1619 | ||
1620 | /* We first write the generated file into memory using the | |
1621 | * following helper, then compare to the file on disk and | |
1622 | * only update the later if anything changed */ | |
1623 | ||
5c3ead8c SR |
1624 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1625 | const char *fmt, ...) | |
1da177e4 LT |
1626 | { |
1627 | char tmp[SZ]; | |
1628 | int len; | |
1629 | va_list ap; | |
62070fa4 | 1630 | |
1da177e4 LT |
1631 | va_start(ap, fmt); |
1632 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1633 | buf_write(buf, tmp, len); |
1da177e4 LT |
1634 | va_end(ap); |
1635 | } | |
1636 | ||
5c3ead8c | 1637 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1638 | { |
1639 | if (buf->size - buf->pos < len) { | |
7670f023 | 1640 | buf->size += len + SZ; |
1da177e4 LT |
1641 | buf->p = realloc(buf->p, buf->size); |
1642 | } | |
1643 | strncpy(buf->p + buf->pos, s, len); | |
1644 | buf->pos += len; | |
1645 | } | |
1646 | ||
c96fca21 SR |
1647 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1648 | { | |
1649 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1650 | ||
1651 | switch (exp) { | |
1652 | case export_gpl: | |
1653 | fatal("modpost: GPL-incompatible module %s%s " | |
1654 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1655 | break; | |
1656 | case export_unused_gpl: | |
1657 | fatal("modpost: GPL-incompatible module %s%s " | |
1658 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1659 | break; | |
1660 | case export_gpl_future: | |
1661 | warn("modpost: GPL-incompatible module %s%s " | |
1662 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1663 | break; | |
1664 | case export_plain: | |
1665 | case export_unused: | |
1666 | case export_unknown: | |
1667 | /* ignore */ | |
1668 | break; | |
1669 | } | |
1670 | } | |
1671 | ||
df578e7d | 1672 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1673 | { |
1674 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1675 | ||
1676 | switch (exp) { | |
1677 | case export_unused: | |
1678 | case export_unused_gpl: | |
1679 | warn("modpost: module %s%s " | |
1680 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1681 | break; | |
1682 | default: | |
1683 | /* ignore */ | |
1684 | break; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1689 | { |
1690 | struct symbol *s, *exp; | |
1691 | ||
1692 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1693 | const char *basename; |
b817f6fe SR |
1694 | exp = find_symbol(s->name); |
1695 | if (!exp || exp->module == mod) | |
1696 | continue; | |
6449bd62 | 1697 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1698 | if (basename) |
1699 | basename++; | |
c96fca21 SR |
1700 | else |
1701 | basename = mod->name; | |
1702 | if (!mod->gpl_compatible) | |
1703 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1704 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1705 | } |
b817f6fe SR |
1706 | } |
1707 | ||
5c3ead8c SR |
1708 | /** |
1709 | * Header for the generated file | |
1710 | **/ | |
1711 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1712 | { |
1713 | buf_printf(b, "#include <linux/module.h>\n"); | |
1714 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1715 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1716 | buf_printf(b, "\n"); | |
1717 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1718 | buf_printf(b, "\n"); | |
1da177e4 LT |
1719 | buf_printf(b, "struct module __this_module\n"); |
1720 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
f83b5e32 | 1721 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
1da177e4 LT |
1722 | if (mod->has_init) |
1723 | buf_printf(b, " .init = init_module,\n"); | |
1724 | if (mod->has_cleanup) | |
1725 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
1726 | " .exit = cleanup_module,\n" | |
1727 | "#endif\n"); | |
e61a1c1c | 1728 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1729 | buf_printf(b, "};\n"); |
1730 | } | |
1731 | ||
a9860bf0 GKH |
1732 | void add_staging_flag(struct buffer *b, const char *name) |
1733 | { | |
1734 | static const char *staging_dir = "drivers/staging"; | |
1735 | ||
1736 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1737 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1738 | } | |
1739 | ||
5c3ead8c SR |
1740 | /** |
1741 | * Record CRCs for unresolved symbols | |
1742 | **/ | |
c53ddacd | 1743 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1744 | { |
1745 | struct symbol *s, *exp; | |
c53ddacd | 1746 | int err = 0; |
1da177e4 LT |
1747 | |
1748 | for (s = mod->unres; s; s = s->next) { | |
1749 | exp = find_symbol(s->name); | |
1750 | if (!exp || exp->module == mod) { | |
c53ddacd | 1751 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1752 | if (warn_unresolved) { |
1753 | warn("\"%s\" [%s.ko] undefined!\n", | |
1754 | s->name, mod->name); | |
1755 | } else { | |
1756 | merror("\"%s\" [%s.ko] undefined!\n", | |
1757 | s->name, mod->name); | |
1758 | err = 1; | |
1759 | } | |
c53ddacd | 1760 | } |
1da177e4 LT |
1761 | continue; |
1762 | } | |
1763 | s->module = exp->module; | |
1764 | s->crc_valid = exp->crc_valid; | |
1765 | s->crc = exp->crc; | |
1766 | } | |
1767 | ||
1768 | if (!modversions) | |
c53ddacd | 1769 | return err; |
1da177e4 LT |
1770 | |
1771 | buf_printf(b, "\n"); | |
1772 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1773 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1774 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1775 | ||
1776 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1777 | if (!s->module) |
1da177e4 | 1778 | continue; |
1da177e4 | 1779 | if (!s->crc_valid) { |
cb80514d | 1780 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1781 | s->name, mod->name); |
1782 | continue; | |
1783 | } | |
1784 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); | |
1785 | } | |
1786 | ||
1787 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1788 | |
1789 | return err; | |
1da177e4 LT |
1790 | } |
1791 | ||
5c3ead8c SR |
1792 | static void add_depends(struct buffer *b, struct module *mod, |
1793 | struct module *modules) | |
1da177e4 LT |
1794 | { |
1795 | struct symbol *s; | |
1796 | struct module *m; | |
1797 | int first = 1; | |
1798 | ||
df578e7d | 1799 | for (m = modules; m; m = m->next) |
1da177e4 | 1800 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1801 | |
1802 | buf_printf(b, "\n"); | |
1803 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1804 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1805 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1806 | buf_printf(b, "\"depends="); | |
1807 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1808 | const char *p; |
1da177e4 LT |
1809 | if (!s->module) |
1810 | continue; | |
1811 | ||
1812 | if (s->module->seen) | |
1813 | continue; | |
1814 | ||
1815 | s->module->seen = 1; | |
df578e7d SR |
1816 | p = strrchr(s->module->name, '/'); |
1817 | if (p) | |
a61b2dfd SR |
1818 | p++; |
1819 | else | |
1820 | p = s->module->name; | |
1821 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1822 | first = 0; |
1823 | } | |
1824 | buf_printf(b, "\";\n"); | |
1825 | } | |
1826 | ||
5c3ead8c | 1827 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1828 | { |
1829 | if (mod->srcversion[0]) { | |
1830 | buf_printf(b, "\n"); | |
1831 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1832 | mod->srcversion); | |
1833 | } | |
1834 | } | |
1835 | ||
5c3ead8c | 1836 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1837 | { |
1838 | char *tmp; | |
1839 | FILE *file; | |
1840 | struct stat st; | |
1841 | ||
1842 | file = fopen(fname, "r"); | |
1843 | if (!file) | |
1844 | goto write; | |
1845 | ||
1846 | if (fstat(fileno(file), &st) < 0) | |
1847 | goto close_write; | |
1848 | ||
1849 | if (st.st_size != b->pos) | |
1850 | goto close_write; | |
1851 | ||
1852 | tmp = NOFAIL(malloc(b->pos)); | |
1853 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1854 | goto free_write; | |
1855 | ||
1856 | if (memcmp(tmp, b->p, b->pos) != 0) | |
1857 | goto free_write; | |
1858 | ||
1859 | free(tmp); | |
1860 | fclose(file); | |
1861 | return; | |
1862 | ||
1863 | free_write: | |
1864 | free(tmp); | |
1865 | close_write: | |
1866 | fclose(file); | |
1867 | write: | |
1868 | file = fopen(fname, "w"); | |
1869 | if (!file) { | |
1870 | perror(fname); | |
1871 | exit(1); | |
1872 | } | |
1873 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
1874 | perror(fname); | |
1875 | exit(1); | |
1876 | } | |
1877 | fclose(file); | |
1878 | } | |
1879 | ||
bd5cbced | 1880 | /* parse Module.symvers file. line format: |
534b89a9 | 1881 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 1882 | **/ |
040fcc81 | 1883 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
1884 | { |
1885 | unsigned long size, pos = 0; | |
1886 | void *file = grab_file(fname, &size); | |
1887 | char *line; | |
1888 | ||
df578e7d | 1889 | if (!file) |
1da177e4 LT |
1890 | /* No symbol versions, silently ignore */ |
1891 | return; | |
1892 | ||
1893 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 1894 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
1895 | unsigned int crc; |
1896 | struct module *mod; | |
040fcc81 | 1897 | struct symbol *s; |
1da177e4 LT |
1898 | |
1899 | if (!(symname = strchr(line, '\t'))) | |
1900 | goto fail; | |
1901 | *symname++ = '\0'; | |
1902 | if (!(modname = strchr(symname, '\t'))) | |
1903 | goto fail; | |
1904 | *modname++ = '\0'; | |
9ac545b0 | 1905 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 1906 | *export++ = '\0'; |
534b89a9 SR |
1907 | if (export && ((end = strchr(export, '\t')) != NULL)) |
1908 | *end = '\0'; | |
1da177e4 LT |
1909 | crc = strtoul(line, &d, 16); |
1910 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
1911 | goto fail; | |
df578e7d SR |
1912 | mod = find_module(modname); |
1913 | if (!mod) { | |
1914 | if (is_vmlinux(modname)) | |
1da177e4 | 1915 | have_vmlinux = 1; |
1da177e4 LT |
1916 | mod = new_module(NOFAIL(strdup(modname))); |
1917 | mod->skip = 1; | |
1918 | } | |
bd5cbced | 1919 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
1920 | s->kernel = kernel; |
1921 | s->preloaded = 1; | |
bd5cbced | 1922 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
1923 | } |
1924 | return; | |
1925 | fail: | |
1926 | fatal("parse error in symbol dump file\n"); | |
1927 | } | |
1928 | ||
040fcc81 SR |
1929 | /* For normal builds always dump all symbols. |
1930 | * For external modules only dump symbols | |
1931 | * that are not read from kernel Module.symvers. | |
1932 | **/ | |
1933 | static int dump_sym(struct symbol *sym) | |
1934 | { | |
1935 | if (!external_module) | |
1936 | return 1; | |
1937 | if (sym->vmlinux || sym->kernel) | |
1938 | return 0; | |
1939 | return 1; | |
1940 | } | |
62070fa4 | 1941 | |
5c3ead8c | 1942 | static void write_dump(const char *fname) |
1da177e4 LT |
1943 | { |
1944 | struct buffer buf = { }; | |
1945 | struct symbol *symbol; | |
1946 | int n; | |
1947 | ||
1948 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
1949 | symbol = symbolhash[n]; | |
1950 | while (symbol) { | |
040fcc81 | 1951 | if (dump_sym(symbol)) |
bd5cbced | 1952 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 1953 | symbol->crc, symbol->name, |
bd5cbced RP |
1954 | symbol->module->name, |
1955 | export_str(symbol->export)); | |
1da177e4 LT |
1956 | symbol = symbol->next; |
1957 | } | |
1958 | } | |
1959 | write_if_changed(&buf, fname); | |
1960 | } | |
1961 | ||
b2e3e658 MD |
1962 | static void add_marker(struct module *mod, const char *name, const char *fmt) |
1963 | { | |
1964 | char *line = NULL; | |
1965 | asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt); | |
1966 | NOFAIL(line); | |
1967 | ||
1968 | mod->markers = NOFAIL(realloc(mod->markers, ((mod->nmarkers + 1) * | |
1969 | sizeof mod->markers[0]))); | |
1970 | mod->markers[mod->nmarkers++] = line; | |
1971 | } | |
1972 | ||
1973 | static void read_markers(const char *fname) | |
1974 | { | |
1975 | unsigned long size, pos = 0; | |
1976 | void *file = grab_file(fname, &size); | |
1977 | char *line; | |
1978 | ||
1979 | if (!file) /* No old markers, silently ignore */ | |
1980 | return; | |
1981 | ||
1982 | while ((line = get_next_line(&pos, file, size))) { | |
1983 | char *marker, *modname, *fmt; | |
1984 | struct module *mod; | |
1985 | ||
1986 | marker = line; | |
1987 | modname = strchr(marker, '\t'); | |
1988 | if (!modname) | |
1989 | goto fail; | |
1990 | *modname++ = '\0'; | |
1991 | fmt = strchr(modname, '\t'); | |
1992 | if (!fmt) | |
1993 | goto fail; | |
1994 | *fmt++ = '\0'; | |
1995 | if (*marker == '\0' || *modname == '\0') | |
1996 | goto fail; | |
1997 | ||
1998 | mod = find_module(modname); | |
1999 | if (!mod) { | |
b2e3e658 MD |
2000 | mod = new_module(NOFAIL(strdup(modname))); |
2001 | mod->skip = 1; | |
2002 | } | |
87f3b6b6 MD |
2003 | if (is_vmlinux(modname)) { |
2004 | have_vmlinux = 1; | |
2005 | mod->skip = 0; | |
2006 | } | |
b2e3e658 | 2007 | |
d35cb360 MD |
2008 | if (!mod->skip) |
2009 | add_marker(mod, marker, fmt); | |
b2e3e658 MD |
2010 | } |
2011 | return; | |
2012 | fail: | |
2013 | fatal("parse error in markers list file\n"); | |
2014 | } | |
2015 | ||
2016 | static int compare_strings(const void *a, const void *b) | |
2017 | { | |
2018 | return strcmp(*(const char **) a, *(const char **) b); | |
2019 | } | |
2020 | ||
2021 | static void write_markers(const char *fname) | |
2022 | { | |
2023 | struct buffer buf = { }; | |
2024 | struct module *mod; | |
2025 | size_t i; | |
2026 | ||
2027 | for (mod = modules; mod; mod = mod->next) | |
2028 | if ((!external_module || !mod->skip) && mod->markers != NULL) { | |
2029 | /* | |
2030 | * Sort the strings so we can skip duplicates when | |
2031 | * we write them out. | |
2032 | */ | |
2033 | qsort(mod->markers, mod->nmarkers, | |
2034 | sizeof mod->markers[0], &compare_strings); | |
2035 | for (i = 0; i < mod->nmarkers; ++i) { | |
2036 | char *line = mod->markers[i]; | |
2037 | buf_write(&buf, line, strlen(line)); | |
2038 | while (i + 1 < mod->nmarkers && | |
2039 | !strcmp(mod->markers[i], | |
2040 | mod->markers[i + 1])) | |
2041 | free(mod->markers[i++]); | |
2042 | free(mod->markers[i]); | |
2043 | } | |
2044 | free(mod->markers); | |
2045 | mod->markers = NULL; | |
2046 | } | |
2047 | ||
2048 | write_if_changed(&buf, fname); | |
2049 | } | |
2050 | ||
2d04b5ae RH |
2051 | struct ext_sym_list { |
2052 | struct ext_sym_list *next; | |
2053 | const char *file; | |
2054 | }; | |
2055 | ||
5c3ead8c | 2056 | int main(int argc, char **argv) |
1da177e4 LT |
2057 | { |
2058 | struct module *mod; | |
2059 | struct buffer buf = { }; | |
040fcc81 SR |
2060 | char *kernel_read = NULL, *module_read = NULL; |
2061 | char *dump_write = NULL; | |
b2e3e658 MD |
2062 | char *markers_read = NULL; |
2063 | char *markers_write = NULL; | |
1da177e4 | 2064 | int opt; |
c53ddacd | 2065 | int err; |
2d04b5ae RH |
2066 | struct ext_sym_list *extsym_iter; |
2067 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2068 | |
2d04b5ae | 2069 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
df578e7d SR |
2070 | switch (opt) { |
2071 | case 'i': | |
2072 | kernel_read = optarg; | |
2073 | break; | |
2074 | case 'I': | |
2075 | module_read = optarg; | |
2076 | external_module = 1; | |
2077 | break; | |
4ce6efed SR |
2078 | case 'c': |
2079 | cross_build = 1; | |
2080 | break; | |
2d04b5ae RH |
2081 | case 'e': |
2082 | external_module = 1; | |
2083 | extsym_iter = | |
2084 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2085 | extsym_iter->next = extsym_start; | |
2086 | extsym_iter->file = optarg; | |
2087 | extsym_start = extsym_iter; | |
2088 | break; | |
df578e7d SR |
2089 | case 'm': |
2090 | modversions = 1; | |
2091 | break; | |
2092 | case 'o': | |
2093 | dump_write = optarg; | |
2094 | break; | |
2095 | case 'a': | |
2096 | all_versions = 1; | |
2097 | break; | |
2098 | case 's': | |
2099 | vmlinux_section_warnings = 0; | |
2100 | break; | |
588ccd73 SR |
2101 | case 'S': |
2102 | sec_mismatch_verbose = 0; | |
2103 | break; | |
df578e7d SR |
2104 | case 'w': |
2105 | warn_unresolved = 1; | |
2106 | break; | |
b2e3e658 MD |
2107 | case 'M': |
2108 | markers_write = optarg; | |
2109 | break; | |
2110 | case 'K': | |
2111 | markers_read = optarg; | |
2112 | break; | |
df578e7d SR |
2113 | default: |
2114 | exit(1); | |
1da177e4 LT |
2115 | } |
2116 | } | |
2117 | ||
040fcc81 SR |
2118 | if (kernel_read) |
2119 | read_dump(kernel_read, 1); | |
2120 | if (module_read) | |
2121 | read_dump(module_read, 0); | |
2d04b5ae RH |
2122 | while (extsym_start) { |
2123 | read_dump(extsym_start->file, 0); | |
2124 | extsym_iter = extsym_start->next; | |
2125 | free(extsym_start); | |
2126 | extsym_start = extsym_iter; | |
2127 | } | |
1da177e4 | 2128 | |
df578e7d | 2129 | while (optind < argc) |
1da177e4 | 2130 | read_symbols(argv[optind++]); |
1da177e4 | 2131 | |
b817f6fe SR |
2132 | for (mod = modules; mod; mod = mod->next) { |
2133 | if (mod->skip) | |
2134 | continue; | |
c96fca21 | 2135 | check_exports(mod); |
b817f6fe SR |
2136 | } |
2137 | ||
c53ddacd KK |
2138 | err = 0; |
2139 | ||
1da177e4 | 2140 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2141 | char fname[strlen(mod->name) + 10]; |
2142 | ||
1da177e4 LT |
2143 | if (mod->skip) |
2144 | continue; | |
2145 | ||
2146 | buf.pos = 0; | |
2147 | ||
2148 | add_header(&buf, mod); | |
a9860bf0 | 2149 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2150 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2151 | add_depends(&buf, mod, modules); |
2152 | add_moddevtable(&buf, mod); | |
2153 | add_srcversion(&buf, mod); | |
2154 | ||
2155 | sprintf(fname, "%s.mod.c", mod->name); | |
2156 | write_if_changed(&buf, fname); | |
2157 | } | |
2158 | ||
2159 | if (dump_write) | |
2160 | write_dump(dump_write); | |
588ccd73 | 2161 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2162 | warn("modpost: Found %d section mismatch(es).\n" |
2163 | "To see full details build your kernel with:\n" | |
2164 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2165 | sec_mismatch_count); | |
1da177e4 | 2166 | |
b2e3e658 MD |
2167 | if (markers_read) |
2168 | read_markers(markers_read); | |
2169 | ||
2170 | if (markers_write) | |
2171 | write_markers(markers_write); | |
2172 | ||
c53ddacd | 2173 | return err; |
1da177e4 | 2174 | } |