blob: 40610984a1b54b06c579f953dabeb5ddb1304525 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Postprocess module symbol versions
2 *
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
Sam Ravnborgdf578e72008-01-11 19:17:15 +01005 * Copyright 2006-2008 Sam Ravnborg
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * 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
Mathieu Desnoyersb2e3e652008-02-13 15:03:39 -080014#define _GNU_SOURCE
15#include <stdio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <ctype.h>
Andrew Morton5003bab2010-08-11 00:42:26 -070017#include <string.h>
Rusty Russell712f9b42013-04-04 17:37:38 +103018#include <limits.h>
Rusty Russelld4ef1c32013-04-04 17:37:32 +103019#include <stdbool.h>
Guenter Roeckeed380f2013-09-23 15:23:54 +093020#include <errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "modpost.h"
Linus Torvalds5a865c02009-12-17 07:23:42 -080022#include "../../include/generated/autoconf.h"
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020023#include "../../include/linux/license.h"
Rusty Russellb92021b2013-03-15 15:04:17 +103024#include "../../include/linux/export.h"
Alan Jenkins9e1b9b82009-11-07 21:03:54 +000025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/* Are we using CONFIG_MODVERSIONS? */
27int modversions = 0;
28/* Warn about undefined symbols? (do so if we have vmlinux) */
29int have_vmlinux = 0;
30/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
31static int all_versions = 0;
Sam Ravnborg040fcc82006-01-28 22:15:55 +010032/* If we are modposting external module set to 1 */
33static int external_module = 0;
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020034/* Warn about section mismatch in vmlinux if set to 1 */
35static int vmlinux_section_warnings = 1;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -070036/* Only warn about unresolved symbols */
37static int warn_unresolved = 0;
Ram Paibd5cbce2006-06-08 22:12:53 -070038/* How a symbol is exported */
Sam Ravnborg588ccd72008-01-24 21:12:37 +010039static int sec_mismatch_count = 0;
40static int sec_mismatch_verbose = 1;
Guenter Roeckeed380f2013-09-23 15:23:54 +093041/* ignore missing files */
42static int ignore_missing_files;
Sam Ravnborg588ccd72008-01-24 21:12:37 +010043
Sam Ravnborgc96fca22006-07-01 11:44:23 +020044enum export {
45 export_plain, export_unused, export_gpl,
46 export_unused_gpl, export_gpl_future, export_unknown
47};
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Andi Kleen6d9a89e2007-11-22 03:43:08 +010049#define PRINTF __attribute__ ((format (printf, 1, 2)))
50
51PRINTF void fatal(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53 va_list arglist;
54
55 fprintf(stderr, "FATAL: ");
56
57 va_start(arglist, fmt);
58 vfprintf(stderr, fmt, arglist);
59 va_end(arglist);
60
61 exit(1);
62}
63
Andi Kleen6d9a89e2007-11-22 03:43:08 +010064PRINTF void warn(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 va_list arglist;
67
68 fprintf(stderr, "WARNING: ");
69
70 va_start(arglist, fmt);
71 vfprintf(stderr, fmt, arglist);
72 va_end(arglist);
73}
74
Andi Kleen6d9a89e2007-11-22 03:43:08 +010075PRINTF void merror(const char *fmt, ...)
Matthew Wilcox2a116652006-10-07 05:35:32 -060076{
77 va_list arglist;
78
79 fprintf(stderr, "ERROR: ");
80
81 va_start(arglist, fmt);
82 vfprintf(stderr, fmt, arglist);
83 va_end(arglist);
84}
85
Rusty Russelld4ef1c32013-04-04 17:37:32 +103086static inline bool strends(const char *str, const char *postfix)
87{
88 if (strlen(str) < strlen(postfix))
89 return false;
90
91 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
92}
93
Sam Ravnborg040fcc82006-01-28 22:15:55 +010094static int is_vmlinux(const char *modname)
95{
96 const char *myname;
97
Sam Ravnborgdf578e72008-01-11 19:17:15 +010098 myname = strrchr(modname, '/');
99 if (myname)
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100100 myname++;
101 else
102 myname = modname;
103
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200104 return (strcmp(myname, "vmlinux") == 0) ||
105 (strcmp(myname, "vmlinux.o") == 0);
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108void *do_nofail(void *ptr, const char *expr)
109{
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100110 if (!ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 fatal("modpost: Memory allocation failure: %s.\n", expr);
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return ptr;
114}
115
116/* A list of all modules we processed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117static struct module *modules;
118
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100119static struct module *find_module(char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
121 struct module *mod;
122
123 for (mod = modules; mod; mod = mod->next)
124 if (strcmp(mod->name, modname) == 0)
125 break;
126 return mod;
127}
128
Rusty Russelld4ef1c32013-04-04 17:37:32 +1030129static struct module *new_module(const char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 struct module *mod;
Rusty Russelld4ef1c32013-04-04 17:37:32 +1030132 char *p;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 mod = NOFAIL(malloc(sizeof(*mod)));
135 memset(mod, 0, sizeof(*mod));
136 p = NOFAIL(strdup(modname));
137
138 /* strip trailing .o */
Rusty Russelld4ef1c32013-04-04 17:37:32 +1030139 if (strends(p, ".o")) {
140 p[strlen(p) - 2] = '\0';
141 mod->is_dot_o = 1;
142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 /* add to list */
145 mod->name = p;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200146 mod->gpl_compatible = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 mod->next = modules;
148 modules = mod;
149
150 return mod;
151}
152
153/* A hash of all exported symbols,
154 * struct symbol is also used for lists of unresolved symbols */
155
156#define SYMBOL_HASH_SIZE 1024
157
158struct symbol {
159 struct symbol *next;
160 struct module *module;
161 unsigned int crc;
162 int crc_valid;
163 unsigned int weak:1;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100164 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
165 unsigned int kernel:1; /* 1 if symbol is from kernel
166 * (only for external modules) **/
Rusty Russellb6568b12013-11-07 12:09:13 +1030167 unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */
Ram Paibd5cbce2006-06-08 22:12:53 -0700168 enum export export; /* Type of export */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 char name[0];
170};
171
172static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
173
174/* This is based on the hash agorithm from gdbm, via tdb */
175static inline unsigned int tdb_hash(const char *name)
176{
177 unsigned value; /* Used to compute the hash value. */
178 unsigned i; /* Used to cycle through random values. */
179
180 /* Set the initial value from the key size. */
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100181 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
183
184 return (1103515243 * value + 12345);
185}
186
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100187/**
188 * Allocate a new symbols for use in the hash of exported symbols or
189 * the list of unresolved symbols per module
190 **/
191static struct symbol *alloc_symbol(const char *name, unsigned int weak,
192 struct symbol *next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
194 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
195
196 memset(s, 0, sizeof(*s));
197 strcpy(s->name, name);
198 s->weak = weak;
199 s->next = next;
200 return s;
201}
202
203/* For the hash of exported symbols */
Ram Paibd5cbce2006-06-08 22:12:53 -0700204static struct symbol *new_symbol(const char *name, struct module *module,
205 enum export export)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
207 unsigned int hash;
208 struct symbol *new;
209
210 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
211 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
212 new->module = module;
Ram Paibd5cbce2006-06-08 22:12:53 -0700213 new->export = export;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100214 return new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100217static struct symbol *find_symbol(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 struct symbol *s;
220
221 /* For our purposes, .foo matches foo. PPC64 needs this. */
222 if (name[0] == '.')
223 name++;
224
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100225 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (strcmp(s->name, name) == 0)
227 return s;
228 }
229 return NULL;
230}
231
Ram Paibd5cbce2006-06-08 22:12:53 -0700232static struct {
233 const char *str;
234 enum export export;
235} export_list[] = {
236 { .str = "EXPORT_SYMBOL", .export = export_plain },
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200237 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
Ram Paibd5cbce2006-06-08 22:12:53 -0700238 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200239 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
Ram Paibd5cbce2006-06-08 22:12:53 -0700240 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
241 { .str = "(unknown)", .export = export_unknown },
242};
243
244
245static const char *export_str(enum export ex)
246{
247 return export_list[ex].str;
248}
249
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100250static enum export export_no(const char *s)
Ram Paibd5cbce2006-06-08 22:12:53 -0700251{
252 int i;
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100253
Sam Ravnborg534b89a2006-07-01 10:10:19 +0200254 if (!s)
255 return export_unknown;
Ram Paibd5cbce2006-06-08 22:12:53 -0700256 for (i = 0; export_list[i].export != export_unknown; i++) {
257 if (strcmp(export_list[i].str, s) == 0)
258 return export_list[i].export;
259 }
260 return export_unknown;
261}
262
Alessio Igor Bogani62a26352011-07-14 08:51:16 +0200263static const char *sec_name(struct elf_info *elf, int secindex);
264
265#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
266
267static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
268{
269 const char *secname = sec_name(elf, sec);
270
271 if (strstarts(secname, "___ksymtab+"))
272 return export_plain;
273 else if (strstarts(secname, "___ksymtab_unused+"))
274 return export_unused;
275 else if (strstarts(secname, "___ksymtab_gpl+"))
276 return export_gpl;
277 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
278 return export_unused_gpl;
279 else if (strstarts(secname, "___ksymtab_gpl_future+"))
280 return export_gpl_future;
281 else
282 return export_unknown;
283}
284
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200285static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
Ram Paibd5cbce2006-06-08 22:12:53 -0700286{
287 if (sec == elf->export_sec)
288 return export_plain;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200289 else if (sec == elf->export_unused_sec)
290 return export_unused;
Ram Paibd5cbce2006-06-08 22:12:53 -0700291 else if (sec == elf->export_gpl_sec)
292 return export_gpl;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200293 else if (sec == elf->export_unused_gpl_sec)
294 return export_unused_gpl;
Ram Paibd5cbce2006-06-08 22:12:53 -0700295 else if (sec == elf->export_gpl_future_sec)
296 return export_gpl_future;
297 else
298 return export_unknown;
299}
300
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100301/**
302 * Add an exported symbol - it may have already been added without a
303 * CRC, in this case just update the CRC
304 **/
Ram Paibd5cbce2006-06-08 22:12:53 -0700305static struct symbol *sym_add_exported(const char *name, struct module *mod,
306 enum export export)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
308 struct symbol *s = find_symbol(name);
309
310 if (!s) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700311 s = new_symbol(name, mod, export);
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100312 } else {
313 if (!s->preloaded) {
Sam Ravnborg7b75b132006-03-05 13:48:58 +0100314 warn("%s: '%s' exported twice. Previous export "
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100315 "was in %s%s\n", mod->name, name,
316 s->module->name,
317 is_vmlinux(s->module->name) ?"":".ko");
Trent Piepho4b219602007-10-11 16:40:10 -0700318 } else {
319 /* In case Modules.symvers was out of date */
320 s->module = mod;
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100321 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100323 s->preloaded = 0;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100324 s->vmlinux = is_vmlinux(mod->name);
325 s->kernel = 0;
Ram Paibd5cbce2006-06-08 22:12:53 -0700326 s->export = export;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100327 return s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100330static void sym_update_crc(const char *name, struct module *mod,
Ram Paibd5cbce2006-06-08 22:12:53 -0700331 unsigned int crc, enum export export)
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100332{
333 struct symbol *s = find_symbol(name);
334
Rusty Russellb6568b12013-11-07 12:09:13 +1030335 if (!s) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700336 s = new_symbol(name, mod, export);
Rusty Russellb6568b12013-11-07 12:09:13 +1030337 /* Don't complain when we find it later. */
338 s->preloaded = 1;
339 }
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100340 s->crc = crc;
341 s->crc_valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100344void *grab_file(const char *filename, unsigned long *size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 struct stat st;
Jesper Juhleb3d5cc2012-05-23 22:28:49 +0930347 void *map = MAP_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 int fd;
349
350 fd = open(filename, O_RDONLY);
Jesper Juhleb3d5cc2012-05-23 22:28:49 +0930351 if (fd < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return NULL;
Jesper Juhleb3d5cc2012-05-23 22:28:49 +0930353 if (fstat(fd, &st))
354 goto failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 *size = st.st_size;
357 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Jesper Juhleb3d5cc2012-05-23 22:28:49 +0930359failed:
360 close(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (map == MAP_FAILED)
362 return NULL;
363 return map;
364}
365
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100366/**
367 * Return a copy of the next line in a mmap'ed file.
368 * spaces in the beginning of the line is trimmed away.
369 * Return a pointer to a static buffer.
370 **/
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100371char *get_next_line(unsigned long *pos, void *file, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 static char line[4096];
374 int skip = 1;
375 size_t len = 0;
376 signed char *p = (signed char *)file + *pos;
377 char *s = line;
378
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100379 for (; *pos < size ; (*pos)++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (skip && isspace(*p)) {
381 p++;
382 continue;
383 }
384 skip = 0;
385 if (*p != '\n' && (*pos < size)) {
386 len++;
387 *s++ = *p++;
388 if (len > 4095)
389 break; /* Too long, stop */
390 } else {
391 /* End of string */
392 *s = '\0';
393 return line;
394 }
395 }
396 /* End of buffer */
397 return NULL;
398}
399
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100400void release_file(void *file, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
402 munmap(file, size);
403}
404
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100405static int parse_elf(struct elf_info *info, const char *filename)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
407 unsigned int i;
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100408 Elf_Ehdr *hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 Elf_Shdr *sechdrs;
410 Elf_Sym *sym;
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200411 const char *secstrings;
412 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414 hdr = grab_file(filename, &info->size);
415 if (!hdr) {
Guenter Roeckeed380f2013-09-23 15:23:54 +0930416 if (ignore_missing_files) {
417 fprintf(stderr, "%s: %s (ignored)\n", filename,
418 strerror(errno));
419 return 0;
420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 perror(filename);
Sam Ravnborg6803dc02006-06-24 23:46:54 +0200422 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 }
424 info->hdr = hdr;
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100425 if (info->size < sizeof(*hdr)) {
426 /* file too small, assume this is an empty .o file */
427 return 0;
428 }
429 /* Is this a valid ELF file? */
430 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
431 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
432 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
433 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
434 /* Not an ELF file - silently ignore it */
435 return 0;
436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 /* Fix endianness in ELF header */
Anders Kaseorg7d875a02009-05-03 22:02:55 +0200438 hdr->e_type = TO_NATIVE(hdr->e_type);
439 hdr->e_machine = TO_NATIVE(hdr->e_machine);
440 hdr->e_version = TO_NATIVE(hdr->e_version);
441 hdr->e_entry = TO_NATIVE(hdr->e_entry);
442 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
443 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
444 hdr->e_flags = TO_NATIVE(hdr->e_flags);
445 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
446 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
447 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
448 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
449 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
450 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 sechdrs = (void *)hdr + hdr->e_shoff;
452 info->sechdrs = sechdrs;
453
Petr Stetiara83710e2007-08-27 12:15:07 +0200454 /* Check if file offset is correct */
455 if (hdr->e_shoff > info->size) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100456 fatal("section header offset=%lu in file '%s' is bigger than "
457 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
458 filename, info->size);
Petr Stetiara83710e2007-08-27 12:15:07 +0200459 return 0;
460 }
461
Anders Kaseorg68457562011-05-19 16:55:27 -0600462 if (hdr->e_shnum == SHN_UNDEF) {
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200463 /*
464 * There are more than 64k sections,
465 * read count from .sh_size.
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200466 */
467 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
468 }
469 else {
470 info->num_sections = hdr->e_shnum;
471 }
472 if (hdr->e_shstrndx == SHN_XINDEX) {
Anders Kaseorg68457562011-05-19 16:55:27 -0600473 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200474 }
475 else {
476 info->secindex_strings = hdr->e_shstrndx;
477 }
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 /* Fix endianness in section headers */
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200480 for (i = 0; i < info->num_sections; i++) {
Anders Kaseorg7d875a02009-05-03 22:02:55 +0200481 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
482 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
483 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
484 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
485 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
486 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
487 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
488 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
489 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
490 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492 /* Find symbol table. */
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200493 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
494 for (i = 1; i < info->num_sections; i++) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700495 const char *secname;
Tejun Heo56fc82c2009-02-06 00:48:02 +0900496 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Tejun Heo56fc82c2009-02-06 00:48:02 +0900498 if (!nobits && sechdrs[i].sh_offset > info->size) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100499 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
500 "sizeof(*hrd)=%zu\n", filename,
501 (unsigned long)sechdrs[i].sh_offset,
502 sizeof(*hdr));
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100503 return 0;
504 }
Ram Paibd5cbce2006-06-08 22:12:53 -0700505 secname = secstrings + sechdrs[i].sh_name;
506 if (strcmp(secname, ".modinfo") == 0) {
Tejun Heo56fc82c2009-02-06 00:48:02 +0900507 if (nobits)
508 fatal("%s has NOBITS .modinfo\n", filename);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
510 info->modinfo_len = sechdrs[i].sh_size;
Ram Paibd5cbce2006-06-08 22:12:53 -0700511 } else if (strcmp(secname, "__ksymtab") == 0)
512 info->export_sec = i;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200513 else if (strcmp(secname, "__ksymtab_unused") == 0)
514 info->export_unused_sec = i;
Ram Paibd5cbce2006-06-08 22:12:53 -0700515 else if (strcmp(secname, "__ksymtab_gpl") == 0)
516 info->export_gpl_sec = i;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200517 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
518 info->export_unused_gpl_sec = i;
Ram Paibd5cbce2006-06-08 22:12:53 -0700519 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
520 info->export_gpl_future_sec = i;
521
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200522 if (sechdrs[i].sh_type == SHT_SYMTAB) {
523 unsigned int sh_link_idx;
524 symtab_idx = i;
525 info->symtab_start = (void *)hdr +
526 sechdrs[i].sh_offset;
527 info->symtab_stop = (void *)hdr +
528 sechdrs[i].sh_offset + sechdrs[i].sh_size;
Anders Kaseorg68457562011-05-19 16:55:27 -0600529 sh_link_idx = sechdrs[i].sh_link;
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200530 info->strtab = (void *)hdr +
531 sechdrs[sh_link_idx].sh_offset;
532 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200534 /* 32bit section no. table? ("more than 64k sections") */
535 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
536 symtab_shndx_idx = i;
537 info->symtab_shndx_start = (void *)hdr +
538 sechdrs[i].sh_offset;
539 info->symtab_shndx_stop = (void *)hdr +
540 sechdrs[i].sh_offset + sechdrs[i].sh_size;
541 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 }
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100543 if (!info->symtab_start)
Sam Ravnborgcb805142006-01-28 16:57:26 +0100544 fatal("%s has no symtab?\n", filename);
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 /* Fix endianness in symbols */
547 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
548 sym->st_shndx = TO_NATIVE(sym->st_shndx);
549 sym->st_name = TO_NATIVE(sym->st_name);
550 sym->st_value = TO_NATIVE(sym->st_value);
551 sym->st_size = TO_NATIVE(sym->st_size);
552 }
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200553
554 if (symtab_shndx_idx != ~0U) {
555 Elf32_Word *p;
Anders Kaseorg68457562011-05-19 16:55:27 -0600556 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200557 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
Anders Kaseorg68457562011-05-19 16:55:27 -0600558 filename, sechdrs[symtab_shndx_idx].sh_link,
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200559 symtab_idx);
560 /* Fix endianness */
561 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
562 p++)
563 *p = TO_NATIVE(*p);
564 }
565
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100566 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100569static void parse_elf_finish(struct elf_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 release_file(info->hdr, info->size);
572}
573
Sam Ravnborg4d7365d2008-06-12 15:02:55 +0200574static int ignore_undef_symbol(struct elf_info *info, const char *symname)
575{
576 /* ignore __this_module, it will be resolved shortly */
Rusty Russellb92021b2013-03-15 15:04:17 +1030577 if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
Sam Ravnborg4d7365d2008-06-12 15:02:55 +0200578 return 1;
579 /* ignore global offset table */
580 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
581 return 1;
582 if (info->hdr->e_machine == EM_PPC)
583 /* Special register function linked on all modules during final link of .ko */
584 if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
585 strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
586 strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
Andreas Schwab8fe9c932013-12-30 15:31:17 +0100587 strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
588 strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
589 strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
Sam Ravnborg4d7365d2008-06-12 15:02:55 +0200590 return 1;
Stephen Rothwell7fca5dc2010-06-29 20:08:42 +0000591 if (info->hdr->e_machine == EM_PPC64)
592 /* Special register function linked on all modules during final link of .ko */
593 if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
Andreas Schwab8fe9c932013-12-30 15:31:17 +0100594 strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
595 strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
596 strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
Stephen Rothwell7fca5dc2010-06-29 20:08:42 +0000597 return 1;
Sam Ravnborg4d7365d2008-06-12 15:02:55 +0200598 /* Do not ignore this symbol */
599 return 0;
600}
601
Rusty Russellb92021b2013-03-15 15:04:17 +1030602#define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
603#define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100605static void handle_modversions(struct module *mod, struct elf_info *info,
606 Elf_Sym *sym, const char *symname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
608 unsigned int crc;
Alessio Igor Bogani62a26352011-07-14 08:51:16 +0200609 enum export export;
610
Frank Rowand258f7422012-04-09 17:59:03 -0700611 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
612 strncmp(symname, "__ksymtab", 9) == 0)
Alessio Igor Bogani62a26352011-07-14 08:51:16 +0200613 export = export_from_secname(info, get_secindex(info, sym));
614 else
615 export = export_from_sec(info, get_secindex(info, sym));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Andi Kleenb5064652013-11-12 15:08:38 -0800617 /* CRC'd symbol */
618 if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
619 crc = (unsigned int) sym->st_value;
620 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
621 export);
622 }
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 switch (sym->st_shndx) {
625 case SHN_COMMON:
Sam Ravnborgcb805142006-01-28 16:57:26 +0100626 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 case SHN_UNDEF:
629 /* undefined symbol */
630 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
631 ELF_ST_BIND(sym->st_info) != STB_WEAK)
632 break;
Sam Ravnborg4d7365d2008-06-12 15:02:55 +0200633 if (ignore_undef_symbol(info, symname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 break;
Ben Colline8d529012005-08-19 13:44:57 -0700635/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
636#if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
637/* add compatibility with older glibc */
638#ifndef STT_SPARC_REGISTER
639#define STT_SPARC_REGISTER STT_REGISTER
640#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 if (info->hdr->e_machine == EM_SPARC ||
642 info->hdr->e_machine == EM_SPARCV9) {
643 /* Ignore register directives. */
Ben Colline8d529012005-08-19 13:44:57 -0700644 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 break;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100646 if (symname[0] == '.') {
647 char *munged = strdup(symname);
648 munged[0] = '_';
649 munged[1] = toupper(munged[1]);
650 symname = munged;
651 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 }
653#endif
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100654
Rusty Russellb92021b2013-03-15 15:04:17 +1030655#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
656 if (symname[0] != '_')
657 break;
658 else
659 symname++;
660#endif
661 mod->unres = alloc_symbol(symname,
662 ELF_ST_BIND(sym->st_info) == STB_WEAK,
663 mod->unres);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 break;
665 default:
666 /* All exported symbols */
Michal Marek8d995132009-12-12 12:02:24 +0100667 if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700668 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
669 export);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 }
Rusty Russellb92021b2013-03-15 15:04:17 +1030671 if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 mod->has_init = 1;
Rusty Russellb92021b2013-03-15 15:04:17 +1030673 if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 mod->has_cleanup = 1;
675 break;
676 }
677}
678
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100679/**
680 * Parse tag=value strings from .modinfo section
681 **/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682static char *next_string(char *string, unsigned long *secsize)
683{
684 /* Skip non-zero chars */
685 while (string[0]) {
686 string++;
687 if ((*secsize)-- <= 1)
688 return NULL;
689 }
690
691 /* Skip any zero padding. */
692 while (!string[0]) {
693 string++;
694 if ((*secsize)-- <= 1)
695 return NULL;
696 }
697 return string;
698}
699
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200700static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
701 const char *tag, char *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
703 char *p;
704 unsigned int taglen = strlen(tag);
705 unsigned long size = modinfo_len;
706
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200707 if (info) {
708 size -= info - (char *)modinfo;
709 modinfo = next_string(info, &size);
710 }
711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 for (p = modinfo; p; p = next_string(p, &size)) {
713 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
714 return p + taglen + 1;
715 }
716 return NULL;
717}
718
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200719static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
720 const char *tag)
721
722{
723 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
724}
725
Sam Ravnborg93684d32006-02-19 11:53:35 +0100726/**
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100727 * Test if string s ends in string sub
728 * return 0 if match
729 **/
730static int strrcmp(const char *s, const char *sub)
731{
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100732 int slen, sublen;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100733
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100734 if (!s || !sub)
735 return 1;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100736
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100737 slen = strlen(s);
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100738 sublen = strlen(sub);
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100739
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100740 if ((slen == 0) || (sublen == 0))
741 return 1;
742
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100743 if (sublen > slen)
744 return 1;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100745
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100746 return memcmp(s + slen - sublen, sub, sublen);
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100747}
748
Sam Ravnborgff13f922008-01-23 19:54:27 +0100749static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
750{
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100751 if (sym)
752 return elf->strtab + sym->st_name;
753 else
Sam Ravnborgf6667512008-02-06 21:51:18 +0100754 return "(unknown)";
Sam Ravnborgff13f922008-01-23 19:54:27 +0100755}
756
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200757static const char *sec_name(struct elf_info *elf, int secindex)
Sam Ravnborgff13f922008-01-23 19:54:27 +0100758{
759 Elf_Shdr *sechdrs = elf->sechdrs;
760 return (void *)elf->hdr +
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200761 elf->sechdrs[elf->secindex_strings].sh_offset +
762 sechdrs[secindex].sh_name;
Sam Ravnborgff13f922008-01-23 19:54:27 +0100763}
764
765static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
766{
767 return (void *)elf->hdr +
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +0200768 elf->sechdrs[elf->secindex_strings].sh_offset +
769 sechdr->sh_name;
Sam Ravnborgff13f922008-01-23 19:54:27 +0100770}
771
Sam Ravnborg10668222008-01-13 22:21:31 +0100772/* if sym is empty or point to a string
773 * like ".[0-9]+" then return 1.
774 * This is the optional prefix added by ld to some sections
775 */
776static int number_prefix(const char *sym)
777{
778 if (*sym++ == '\0')
779 return 1;
780 if (*sym != '.')
781 return 0;
782 do {
783 char c = *sym++;
784 if (c < '0' || c > '9')
785 return 0;
786 } while (*sym);
787 return 1;
788}
789
790/* The pattern is an array of simple patterns.
791 * "foo" will match an exact string equal to "foo"
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100792 * "*foo" will match a string that ends with "foo"
Sam Ravnborg10668222008-01-13 22:21:31 +0100793 * "foo*" will match a string that begins with "foo"
794 * "foo$" will match a string equal to "foo" or "foo.1"
795 * where the '1' can be any number including several digits.
796 * The $ syntax is for sections where ld append a dot number
797 * to make section name unique.
798 */
Trevor Keith5c725132009-09-22 16:43:38 -0700799static int match(const char *sym, const char * const pat[])
Sam Ravnborg10668222008-01-13 22:21:31 +0100800{
801 const char *p;
802 while (*pat) {
803 p = *pat++;
804 const char *endp = p + strlen(p) - 1;
805
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100806 /* "*foo" */
807 if (*p == '*') {
808 if (strrcmp(sym, p + 1) == 0)
809 return 1;
810 }
Sam Ravnborg10668222008-01-13 22:21:31 +0100811 /* "foo*" */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100812 else if (*endp == '*') {
Sam Ravnborg10668222008-01-13 22:21:31 +0100813 if (strncmp(sym, p, strlen(p) - 1) == 0)
814 return 1;
815 }
816 /* "foo$" */
817 else if (*endp == '$') {
818 if (strncmp(sym, p, strlen(p) - 1) == 0) {
819 if (number_prefix(sym + strlen(p) - 1))
820 return 1;
821 }
822 }
823 /* no wildcards */
824 else {
825 if (strcmp(p, sym) == 0)
826 return 1;
827 }
828 }
829 /* no match */
830 return 0;
831}
832
Sam Ravnborg10668222008-01-13 22:21:31 +0100833/* sections that we do not want to do full section mismatch check on */
834static const char *section_white_list[] =
Sam Ravnborg4391ed62009-05-04 13:05:26 +0200835{
836 ".comment*",
837 ".debug*",
Chen Gang4d10c222013-08-20 15:33:19 +0930838 ".cranges", /* sh64 */
H.J. Lu11215842010-12-15 17:11:22 -0800839 ".zdebug*", /* Compressed debug sections. */
David Howells019fca82010-08-12 16:54:47 +0100840 ".GCC-command-line", /* mn10300 */
Jonathan Kliegman76b27642012-10-04 16:32:19 -0400841 ".GCC.command.line", /* record-gcc-switches, non mn10300 */
Sam Ravnborg4391ed62009-05-04 13:05:26 +0200842 ".mdebug*", /* alpha, score, mips etc. */
843 ".pdr", /* alpha, score, mips etc. */
844 ".stab*",
845 ".note*",
846 ".got*",
847 ".toc*",
Max Filippovaf42e972012-09-17 05:44:38 +0400848 ".xt.prop", /* xtensa */
849 ".xt.lit", /* xtensa */
Vineet Guptaf2e207f2013-01-21 17:18:57 +1030850 ".arcextmap*", /* arc */
851 ".gnu.linkonce.arcext*", /* arc : modules */
Sam Ravnborg4391ed62009-05-04 13:05:26 +0200852 NULL
853};
Sam Ravnborg10668222008-01-13 22:21:31 +0100854
Sam Ravnborge241a632008-01-28 20:13:13 +0100855/*
Anders Kaseorgb614a692009-04-23 16:49:33 -0400856 * This is used to find sections missing the SHF_ALLOC flag.
Sam Ravnborge241a632008-01-28 20:13:13 +0100857 * The cause of this is often a section specified in assembler
Anders Kaseorgb614a692009-04-23 16:49:33 -0400858 * without "ax" / "aw".
Sam Ravnborge241a632008-01-28 20:13:13 +0100859 */
Anders Kaseorgb614a692009-04-23 16:49:33 -0400860static void check_section(const char *modname, struct elf_info *elf,
861 Elf_Shdr *sechdr)
Sam Ravnborge241a632008-01-28 20:13:13 +0100862{
Anders Kaseorgb614a692009-04-23 16:49:33 -0400863 const char *sec = sech_name(elf, sechdr);
Sam Ravnborge241a632008-01-28 20:13:13 +0100864
Anders Kaseorgb614a692009-04-23 16:49:33 -0400865 if (sechdr->sh_type == SHT_PROGBITS &&
866 !(sechdr->sh_flags & SHF_ALLOC) &&
867 !match(sec, section_white_list)) {
868 warn("%s (%s): unexpected non-allocatable section.\n"
869 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
870 "Note that for example <linux/init.h> contains\n"
871 "section definitions for use in .S files.\n\n",
872 modname, sec);
Sam Ravnborge241a632008-01-28 20:13:13 +0100873 }
Sam Ravnborge241a632008-01-28 20:13:13 +0100874}
875
876
877
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100878#define ALL_INIT_DATA_SECTIONS \
Paul Gortmakere24f66282013-06-19 19:30:48 -0400879 ".init.setup$", ".init.rodata$", ".meminit.rodata$", \
880 ".init.data$", ".meminit.data$"
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100881#define ALL_EXIT_DATA_SECTIONS \
Paul Gortmakere24f66282013-06-19 19:30:48 -0400882 ".exit.data$", ".memexit.data$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100883
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100884#define ALL_INIT_TEXT_SECTIONS \
Paul Gortmakere24f66282013-06-19 19:30:48 -0400885 ".init.text$", ".meminit.text$"
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100886#define ALL_EXIT_TEXT_SECTIONS \
Paul Gortmakere24f66282013-06-19 19:30:48 -0400887 ".exit.text$", ".memexit.text$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100888
Sebastian Andrzej Siewiorbb15d8d2012-06-03 20:48:17 +0200889#define ALL_PCI_INIT_SECTIONS \
890 ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \
891 ".pci_fixup_enable$", ".pci_fixup_resume$", \
892 ".pci_fixup_resume_early$", ".pci_fixup_suspend$"
893
Paul Gortmakere24f66282013-06-19 19:30:48 -0400894#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
895#define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
Uwe Kleine-König4a31a222010-01-29 12:04:26 +0100896
897#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
898#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
Sam Ravnborg10668222008-01-13 22:21:31 +0100899
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100900#define DATA_SECTIONS ".data$", ".data.rel$"
Tom Rini06df44e2013-05-20 10:25:38 +0930901#define TEXT_SECTIONS ".text$", ".text.unlikely$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100902
Jan Beulichfd6c3a82009-03-12 10:58:33 +0000903#define INIT_SECTIONS ".init.*"
Jan Beulichfd6c3a82009-03-12 10:58:33 +0000904#define MEM_INIT_SECTIONS ".meminit.*"
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100905
Jan Beulichfd6c3a82009-03-12 10:58:33 +0000906#define EXIT_SECTIONS ".exit.*"
Jan Beulichfd6c3a82009-03-12 10:58:33 +0000907#define MEM_EXIT_SECTIONS ".memexit.*"
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100908
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100909/* init data sections */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100910static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100911
912/* all init sections */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100913static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100914
915/* All init and exit sections (code + data) */
916static const char *init_exit_sections[] =
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100917 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100918
919/* data section */
920static const char *data_sections[] = { DATA_SECTIONS, NULL };
921
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100922
923/* symbols in .data that may refer to init/exit sections */
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100924#define DEFAULT_SYMBOL_WHITE_LIST \
925 "*driver", \
926 "*_template", /* scsi uses *_template a lot */ \
927 "*_timer", /* arm uses ops structures named _timer a lot */ \
928 "*_sht", /* scsi also used *_sht to some extent */ \
929 "*_ops", \
930 "*_probe", \
931 "*_probe_one", \
932 "*_console"
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100933
934static const char *head_sections[] = { ".head.text*", NULL };
935static const char *linker_symbols[] =
936 { "__init_begin", "_sinittext", "_einittext", NULL };
937
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100938enum mismatch {
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100939 TEXT_TO_ANY_INIT,
940 DATA_TO_ANY_INIT,
941 TEXT_TO_ANY_EXIT,
942 DATA_TO_ANY_EXIT,
943 XXXINIT_TO_SOME_INIT,
944 XXXEXIT_TO_SOME_EXIT,
945 ANY_INIT_TO_ANY_EXIT,
946 ANY_EXIT_TO_ANY_INIT,
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100947 EXPORT_TO_INIT_EXIT,
948};
949
Sam Ravnborg10668222008-01-13 22:21:31 +0100950struct sectioncheck {
951 const char *fromsec[20];
952 const char *tosec[20];
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100953 enum mismatch mismatch;
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100954 const char *symbol_white_list[20];
Sam Ravnborg10668222008-01-13 22:21:31 +0100955};
956
957const struct sectioncheck sectioncheck[] = {
958/* Do not reference init/exit code/data from
959 * normal code and data
960 */
961{
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100962 .fromsec = { TEXT_SECTIONS, NULL },
963 .tosec = { ALL_INIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100964 .mismatch = TEXT_TO_ANY_INIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100965 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100966},
967{
968 .fromsec = { DATA_SECTIONS, NULL },
Uwe Kleine-König0db252452010-01-30 21:14:23 +0100969 .tosec = { ALL_XXXINIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100970 .mismatch = DATA_TO_ANY_INIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100971 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100972},
973{
Uwe Kleine-König0db252452010-01-30 21:14:23 +0100974 .fromsec = { DATA_SECTIONS, NULL },
975 .tosec = { INIT_SECTIONS, NULL },
976 .mismatch = DATA_TO_ANY_INIT,
977 .symbol_white_list = {
978 "*_template", "*_timer", "*_sht", "*_ops",
979 "*_probe", "*_probe_one", "*_console", NULL
980 },
981},
982{
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100983 .fromsec = { TEXT_SECTIONS, NULL },
984 .tosec = { ALL_EXIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100985 .mismatch = TEXT_TO_ANY_EXIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100986 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100987},
988{
989 .fromsec = { DATA_SECTIONS, NULL },
990 .tosec = { ALL_EXIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100991 .mismatch = DATA_TO_ANY_EXIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100992 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100993},
Paul Gortmakere24f66282013-06-19 19:30:48 -0400994/* Do not reference init code/data from meminit code/data */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100995{
Uwe Kleine-König4a31a222010-01-29 12:04:26 +0100996 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100997 .tosec = { INIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +0100998 .mismatch = XXXINIT_TO_SOME_INIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +0100999 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborgeb8f6892008-01-20 20:07:28 +01001000},
Paul Gortmakere24f66282013-06-19 19:30:48 -04001001/* Do not reference exit code/data from memexit code/data */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +01001002{
Uwe Kleine-König4a31a222010-01-29 12:04:26 +01001003 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001004 .tosec = { EXIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001005 .mismatch = XXXEXIT_TO_SOME_EXIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001006 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg10668222008-01-13 22:21:31 +01001007},
1008/* Do not use exit code/data from init code */
1009{
Sam Ravnborgeb8f6892008-01-20 20:07:28 +01001010 .fromsec = { ALL_INIT_SECTIONS, NULL },
1011 .tosec = { ALL_EXIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001012 .mismatch = ANY_INIT_TO_ANY_EXIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001013 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg10668222008-01-13 22:21:31 +01001014},
1015/* Do not use init code/data from exit code */
1016{
Sam Ravnborgeb8f6892008-01-20 20:07:28 +01001017 .fromsec = { ALL_EXIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001018 .tosec = { ALL_INIT_SECTIONS, NULL },
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001019 .mismatch = ANY_EXIT_TO_ANY_INIT,
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001020 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg10668222008-01-13 22:21:31 +01001021},
Sebastian Andrzej Siewiorbb15d8d2012-06-03 20:48:17 +02001022{
1023 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1024 .tosec = { INIT_SECTIONS, NULL },
1025 .mismatch = ANY_INIT_TO_ANY_EXIT,
1026 .symbol_white_list = { NULL },
1027},
Sam Ravnborg10668222008-01-13 22:21:31 +01001028/* Do not export init/exit functions or data */
1029{
1030 .fromsec = { "__ksymtab*", NULL },
Sam Ravnborgfa95eb12008-02-02 23:30:22 +01001031 .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001032 .mismatch = EXPORT_TO_INIT_EXIT,
1033 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
Sam Ravnborg10668222008-01-13 22:21:31 +01001034}
1035};
1036
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001037static const struct sectioncheck *section_mismatch(
1038 const char *fromsec, const char *tosec)
Sam Ravnborg10668222008-01-13 22:21:31 +01001039{
1040 int i;
1041 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1042 const struct sectioncheck *check = &sectioncheck[0];
1043
1044 for (i = 0; i < elems; i++) {
1045 if (match(fromsec, check->fromsec) &&
1046 match(tosec, check->tosec))
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001047 return check;
Sam Ravnborg10668222008-01-13 22:21:31 +01001048 check++;
1049 }
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001050 return NULL;
Sam Ravnborg10668222008-01-13 22:21:31 +01001051}
1052
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001053/**
1054 * Whitelist to allow certain references to pass with no warning.
Sam Ravnborg0e0d3142007-05-17 20:14:48 +02001055 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001056 * Pattern 1:
1057 * If a module parameter is declared __initdata and permissions=0
1058 * then this is legal despite the warning generated.
1059 * We cannot see value of permissions here, so just ignore
1060 * this pattern.
1061 * The pattern is identified by:
1062 * tosec = .init.data
Sam Ravnborg9209aed2006-03-05 00:16:26 +01001063 * fromsec = .data*
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001064 * atsym =__param*
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001065 *
Rusty Russell6a841522010-08-11 23:04:16 -06001066 * Pattern 1a:
1067 * module_param_call() ops can refer to __init set function if permissions=0
1068 * The pattern is identified by:
1069 * tosec = .init.text
1070 * fromsec = .data*
1071 * atsym = __param_ops_*
1072 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001073 * Pattern 2:
Randy Dunlap72ee59b2006-04-15 11:17:12 -07001074 * Many drivers utilise a *driver container with references to
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001075 * add, remove, probe functions etc.
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001076 * the pattern is identified by:
Sam Ravnborg83cda2b2007-07-25 21:52:31 +02001077 * tosec = init or exit section
1078 * fromsec = data section
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001079 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1080 * *probe_one, *_console, *_timer
Vivek Goyalee6a8542007-01-11 01:52:44 +01001081 *
1082 * Pattern 3:
Sam Ravnborgc9939712009-04-26 11:17:42 +02001083 * Whitelist all references from .head.text to any init section
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +01001084 *
Sam Ravnborg1d8af552007-06-03 00:41:22 +02001085 * Pattern 4:
Vivek Goyalee6a8542007-01-11 01:52:44 +01001086 * Some symbols belong to init section but still it is ok to reference
1087 * these from non-init sections as these symbols don't have any memory
1088 * allocated for them and symbol address and value are same. So even
1089 * if init section is freed, its ok to reference those symbols.
1090 * For ex. symbols marking the init section boundaries.
1091 * This pattern is identified by
1092 * refsymname = __init_begin, _sinittext, _einittext
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +01001093 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001094 **/
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001095static int secref_whitelist(const struct sectioncheck *mismatch,
1096 const char *fromsec, const char *fromsym,
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001097 const char *tosec, const char *tosym)
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001098{
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001099 /* Check for pattern 1 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +01001100 if (match(tosec, init_data_sections) &&
1101 match(fromsec, data_sections) &&
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001102 (strncmp(fromsym, "__param", strlen("__param")) == 0))
1103 return 0;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001104
Rusty Russell6a841522010-08-11 23:04:16 -06001105 /* Check for pattern 1a */
1106 if (strcmp(tosec, ".init.text") == 0 &&
1107 match(fromsec, data_sections) &&
1108 (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
1109 return 0;
1110
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001111 /* Check for pattern 2 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +01001112 if (match(tosec, init_exit_sections) &&
1113 match(fromsec, data_sections) &&
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001114 match(fromsym, mismatch->symbol_white_list))
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001115 return 0;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001116
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +01001117 /* Check for pattern 3 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +01001118 if (match(fromsec, head_sections) &&
1119 match(tosec, init_sections))
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001120 return 0;
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +01001121
Sam Ravnborg1d8af552007-06-03 00:41:22 +02001122 /* Check for pattern 4 */
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001123 if (match(tosym, linker_symbols))
1124 return 0;
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +01001125
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001126 return 1;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001127}
1128
1129/**
Sam Ravnborg93684d32006-02-19 11:53:35 +01001130 * Find symbol based on relocation record info.
1131 * In some cases the symbol supplied is a valid symbol so
1132 * return refsym. If st_name != 0 we assume this is a valid symbol.
1133 * In other cases the symbol needs to be looked up in the symbol table
1134 * based on section and address.
1135 * **/
Sam Ravnborg9ad21c32008-01-18 21:04:34 +01001136static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
Sam Ravnborg93684d32006-02-19 11:53:35 +01001137 Elf_Sym *relsym)
1138{
1139 Elf_Sym *sym;
Sam Ravnborg9ad21c32008-01-18 21:04:34 +01001140 Elf_Sym *near = NULL;
1141 Elf64_Sword distance = 20;
1142 Elf64_Sword d;
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001143 unsigned int relsym_secindex;
Sam Ravnborg93684d32006-02-19 11:53:35 +01001144
1145 if (relsym->st_name != 0)
1146 return relsym;
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001147
1148 relsym_secindex = get_secindex(elf, relsym);
Sam Ravnborg93684d32006-02-19 11:53:35 +01001149 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001150 if (get_secindex(elf, sym) != relsym_secindex)
Sam Ravnborg93684d32006-02-19 11:53:35 +01001151 continue;
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001152 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1153 continue;
Sam Ravnborg93684d32006-02-19 11:53:35 +01001154 if (sym->st_value == addr)
1155 return sym;
Sam Ravnborg9ad21c32008-01-18 21:04:34 +01001156 /* Find a symbol nearby - addr are maybe negative */
1157 d = sym->st_value - addr;
1158 if (d < 0)
1159 d = addr - sym->st_value;
1160 if (d < distance) {
1161 distance = d;
1162 near = sym;
1163 }
Sam Ravnborg93684d32006-02-19 11:53:35 +01001164 }
Sam Ravnborg9ad21c32008-01-18 21:04:34 +01001165 /* We need a close match */
1166 if (distance < 20)
1167 return near;
1168 else
1169 return NULL;
Sam Ravnborg93684d32006-02-19 11:53:35 +01001170}
1171
David Brownellda68d612007-02-20 13:58:16 -08001172static inline int is_arm_mapping_symbol(const char *str)
1173{
1174 return str[0] == '$' && strchr("atd", str[1])
1175 && (str[2] == '\0' || str[2] == '.');
1176}
1177
1178/*
1179 * If there's no name there, ignore it; likewise, ignore it if it's
1180 * one of the magic symbols emitted used by current ARM tools.
1181 *
1182 * Otherwise if find_symbols_between() returns those symbols, they'll
1183 * fail the whitelist tests and cause lots of false alarms ... fixable
1184 * only by merging __exit and __init sections into __text, bloating
1185 * the kernel (which is especially evil on embedded platforms).
1186 */
1187static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1188{
1189 const char *name = elf->strtab + sym->st_name;
1190
1191 if (!name || !strlen(name))
1192 return 0;
1193 return !is_arm_mapping_symbol(name);
1194}
1195
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001196/*
Sam Ravnborg43c74d12006-03-05 12:02:46 +01001197 * Find symbols before or equal addr and after addr - in the section sec.
1198 * If we find two symbols with equal offset prefer one with a valid name.
1199 * The ELF format may have a better way to detect what type of symbol
1200 * it is, but this works for now.
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001201 **/
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001202static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1203 const char *sec)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001204{
1205 Elf_Sym *sym;
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001206 Elf_Sym *near = NULL;
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001207 Elf_Addr distance = ~0;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001208
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001209 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1210 const char *symsec;
1211
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001212 if (is_shndx_special(sym->st_shndx))
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001213 continue;
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001214 symsec = sec_name(elf, get_secindex(elf, sym));
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001215 if (strcmp(symsec, sec) != 0)
1216 continue;
David Brownellda68d612007-02-20 13:58:16 -08001217 if (!is_valid_name(elf, sym))
1218 continue;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001219 if (sym->st_value <= addr) {
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001220 if ((addr - sym->st_value) < distance) {
1221 distance = addr - sym->st_value;
1222 near = sym;
1223 } else if ((addr - sym->st_value) == distance) {
1224 near = sym;
Sam Ravnborg43c74d12006-03-05 12:02:46 +01001225 }
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001226 }
1227 }
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001228 return near;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001229}
1230
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001231/*
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001232 * Convert a section name to the function/data attribute
1233 * .init.text => __init
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001234 * .memexitconst => __memconst
1235 * etc.
Andy Shevchenkocbcf14a92010-08-17 13:36:40 +03001236 *
1237 * The memory of returned value has been allocated on a heap. The user of this
1238 * method should free it after usage.
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001239*/
1240static char *sec2annotation(const char *s)
1241{
1242 if (match(s, init_exit_sections)) {
1243 char *p = malloc(20);
1244 char *r = p;
1245
1246 *p++ = '_';
1247 *p++ = '_';
1248 if (*s == '.')
1249 s++;
1250 while (*s && *s != '.')
1251 *p++ = *s++;
1252 *p = '\0';
1253 if (*s == '.')
1254 s++;
1255 if (strstr(s, "rodata") != NULL)
1256 strcat(p, "const ");
1257 else if (strstr(s, "data") != NULL)
1258 strcat(p, "data ");
1259 else
1260 strcat(p, " ");
Andy Shevchenkocbcf14a92010-08-17 13:36:40 +03001261 return r;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001262 } else {
Andrew Morton5003bab2010-08-11 00:42:26 -07001263 return strdup("");
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001264 }
1265}
1266
1267static int is_function(Elf_Sym *sym)
1268{
1269 if (sym)
1270 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1271 else
Sam Ravnborgf6667512008-02-06 21:51:18 +01001272 return -1;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001273}
1274
Randy Dunlap00759c0e2011-03-15 14:13:47 -07001275static void print_section_list(const char * const list[20])
1276{
1277 const char *const *s = list;
1278
1279 while (*s) {
1280 fprintf(stderr, "%s", *s);
1281 s++;
1282 if (*s)
1283 fprintf(stderr, ", ");
1284 }
1285 fprintf(stderr, "\n");
1286}
1287
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001288/*
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001289 * Print a warning about a section mismatch.
1290 * Try to find symbols near it so user can find it.
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001291 * Check whitelist before warning - it may be a false positive.
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001292 */
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001293static void report_sec_mismatch(const char *modname,
1294 const struct sectioncheck *mismatch,
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001295 const char *fromsec,
1296 unsigned long long fromaddr,
1297 const char *fromsym,
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001298 int from_is_func,
1299 const char *tosec, const char *tosym,
1300 int to_is_func)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001301{
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001302 const char *from, *from_p;
1303 const char *to, *to_p;
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001304 char *prl_from;
1305 char *prl_to;
Sam Ravnborgf6667512008-02-06 21:51:18 +01001306
1307 switch (from_is_func) {
1308 case 0: from = "variable"; from_p = ""; break;
1309 case 1: from = "function"; from_p = "()"; break;
1310 default: from = "(unknown reference)"; from_p = ""; break;
1311 }
1312 switch (to_is_func) {
1313 case 0: to = "variable"; to_p = ""; break;
1314 case 1: to = "function"; to_p = "()"; break;
1315 default: to = "(unknown reference)"; to_p = ""; break;
1316 }
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001317
Sam Ravnborge5f95c82008-02-02 18:57:18 +01001318 sec_mismatch_count++;
1319 if (!sec_mismatch_verbose)
1320 return;
1321
Geert Uytterhoeven7c0ac492008-02-05 11:38:49 +01001322 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1323 "to the %s %s:%s%s\n",
1324 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1325 tosym, to_p);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001326
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001327 switch (mismatch->mismatch) {
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001328 case TEXT_TO_ANY_INIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001329 prl_from = sec2annotation(fromsec);
1330 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001331 fprintf(stderr,
Sam Ravnborgf6667512008-02-06 21:51:18 +01001332 "The function %s%s() references\n"
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001333 "the %s %s%s%s.\n"
1334 "This is often because %s lacks a %s\n"
1335 "annotation or the annotation of %s is wrong.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001336 prl_from, fromsym,
1337 to, prl_to, tosym, to_p,
1338 fromsym, prl_to, tosym);
1339 free(prl_from);
1340 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001341 break;
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001342 case DATA_TO_ANY_INIT: {
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001343 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001344 fprintf(stderr,
1345 "The variable %s references\n"
1346 "the %s %s%s%s\n"
1347 "If the reference is valid then annotate the\n"
Sam Ravnborg8b8b76c2009-06-06 00:18:05 +02001348 "variable with __init* or __refdata (see linux/init.h) "
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001349 "or name the variable:\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001350 fromsym, to, prl_to, tosym, to_p);
Randy Dunlap00759c0e2011-03-15 14:13:47 -07001351 print_section_list(mismatch->symbol_white_list);
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001352 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001353 break;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001354 }
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001355 case TEXT_TO_ANY_EXIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001356 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001357 fprintf(stderr,
1358 "The function %s() references a %s in an exit section.\n"
1359 "Often the %s %s%s has valid usage outside the exit section\n"
1360 "and the fix is to remove the %sannotation of %s.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001361 fromsym, to, to, tosym, to_p, prl_to, tosym);
1362 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001363 break;
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001364 case DATA_TO_ANY_EXIT: {
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001365 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001366 fprintf(stderr,
1367 "The variable %s references\n"
1368 "the %s %s%s%s\n"
1369 "If the reference is valid then annotate the\n"
1370 "variable with __exit* (see linux/init.h) or "
1371 "name the variable:\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001372 fromsym, to, prl_to, tosym, to_p);
Randy Dunlap00759c0e2011-03-15 14:13:47 -07001373 print_section_list(mismatch->symbol_white_list);
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001374 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001375 break;
1376 }
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001377 case XXXINIT_TO_SOME_INIT:
1378 case XXXEXIT_TO_SOME_EXIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001379 prl_from = sec2annotation(fromsec);
1380 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001381 fprintf(stderr,
1382 "The %s %s%s%s references\n"
1383 "a %s %s%s%s.\n"
1384 "If %s is only used by %s then\n"
1385 "annotate %s with a matching annotation.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001386 from, prl_from, fromsym, from_p,
1387 to, prl_to, tosym, to_p,
Geert Uytterhoevenb1d26752008-02-17 14:12:10 +01001388 tosym, fromsym, tosym);
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001389 free(prl_from);
1390 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001391 break;
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001392 case ANY_INIT_TO_ANY_EXIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001393 prl_from = sec2annotation(fromsec);
1394 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001395 fprintf(stderr,
1396 "The %s %s%s%s references\n"
1397 "a %s %s%s%s.\n"
1398 "This is often seen when error handling "
1399 "in the init function\n"
1400 "uses functionality in the exit path.\n"
1401 "The fix is often to remove the %sannotation of\n"
1402 "%s%s so it may be used outside an exit section.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001403 from, prl_from, fromsym, from_p,
1404 to, prl_to, tosym, to_p,
Andrew Morton5003bab2010-08-11 00:42:26 -07001405 prl_to, tosym, to_p);
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001406 free(prl_from);
1407 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001408 break;
Uwe Kleine-Königbbd3f4f2010-01-30 16:35:47 +01001409 case ANY_EXIT_TO_ANY_INIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001410 prl_from = sec2annotation(fromsec);
1411 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001412 fprintf(stderr,
1413 "The %s %s%s%s references\n"
1414 "a %s %s%s%s.\n"
1415 "This is often seen when error handling "
1416 "in the exit function\n"
1417 "uses functionality in the init path.\n"
1418 "The fix is often to remove the %sannotation of\n"
1419 "%s%s so it may be used outside an init section.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001420 from, prl_from, fromsym, from_p,
1421 to, prl_to, tosym, to_p,
1422 prl_to, tosym, to_p);
1423 free(prl_from);
1424 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001425 break;
1426 case EXPORT_TO_INIT_EXIT:
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001427 prl_to = sec2annotation(tosec);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001428 fprintf(stderr,
1429 "The symbol %s is exported and annotated %s\n"
1430 "Fix this by removing the %sannotation of %s "
1431 "or drop the export.\n",
Alexey Fomenko37ed19d2010-08-09 17:20:24 -07001432 tosym, prl_to, prl_to, tosym);
1433 free(prl_to);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001434 break;
1435 }
1436 fprintf(stderr, "\n");
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001437}
1438
1439static void check_section_mismatch(const char *modname, struct elf_info *elf,
1440 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1441{
1442 const char *tosec;
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001443 const struct sectioncheck *mismatch;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001444
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001445 tosec = sec_name(elf, get_secindex(elf, sym));
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001446 mismatch = section_mismatch(fromsec, tosec);
Uwe Kleine-König0d2a6362010-01-30 16:56:20 +01001447 if (mismatch) {
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001448 Elf_Sym *to;
1449 Elf_Sym *from;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001450 const char *tosym;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001451 const char *fromsym;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001452
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001453 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1454 fromsym = sym_name(elf, from);
1455 to = find_elf_symbol(elf, r->r_addend, sym);
1456 tosym = sym_name(elf, to);
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001457
1458 /* check whitelist - we may ignore it */
Uwe Kleine-Königaf92a822010-01-30 20:52:50 +01001459 if (secref_whitelist(mismatch,
1460 fromsec, fromsym, tosec, tosym)) {
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001461 report_sec_mismatch(modname, mismatch,
1462 fromsec, r->r_offset, fromsym,
1463 is_function(from), tosec, tosym,
1464 is_function(to));
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001465 }
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001466 }
1467}
1468
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001469static unsigned int *reloc_location(struct elf_info *elf,
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001470 Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001471{
1472 Elf_Shdr *sechdrs = elf->sechdrs;
Anders Kaseorg68457562011-05-19 16:55:27 -06001473 int section = sechdr->sh_info;
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001474
1475 return (void *)elf->hdr + sechdrs[section].sh_offset +
Olof Johansson731ece42010-12-10 02:09:23 -06001476 r->r_offset;
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001477}
1478
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001479static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001480{
1481 unsigned int r_typ = ELF_R_TYPE(r->r_info);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001482 unsigned int *location = reloc_location(elf, sechdr, r);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001483
1484 switch (r_typ) {
1485 case R_386_32:
1486 r->r_addend = TO_NATIVE(*location);
1487 break;
1488 case R_386_PC32:
1489 r->r_addend = TO_NATIVE(*location) + 4;
1490 /* For CONFIG_RELOCATABLE=y */
1491 if (elf->hdr->e_type == ET_EXEC)
1492 r->r_addend += r->r_offset;
1493 break;
1494 }
1495 return 0;
1496}
1497
Tony Lindgren6e2e3402012-02-14 21:58:56 +01001498#ifndef R_ARM_CALL
1499#define R_ARM_CALL 28
1500#endif
1501#ifndef R_ARM_JUMP24
1502#define R_ARM_JUMP24 29
1503#endif
1504
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001505static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001506{
1507 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1508
1509 switch (r_typ) {
1510 case R_ARM_ABS32:
1511 /* From ARM ABI: (S + A) | T */
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001512 r->r_addend = (int)(long)
1513 (elf->symtab_start + ELF_R_SYM(r->r_info));
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001514 break;
1515 case R_ARM_PC24:
Tony Lindgren6e2e3402012-02-14 21:58:56 +01001516 case R_ARM_CALL:
1517 case R_ARM_JUMP24:
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001518 /* From ARM ABI: ((S + A) | T) - P */
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001519 r->r_addend = (int)(long)(elf->hdr +
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001520 sechdr->sh_offset +
1521 (r->r_offset - sechdr->sh_addr));
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001522 break;
1523 default:
1524 return 1;
1525 }
1526 return 0;
1527}
1528
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001529static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001530{
1531 unsigned int r_typ = ELF_R_TYPE(r->r_info);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001532 unsigned int *location = reloc_location(elf, sechdr, r);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001533 unsigned int inst;
1534
1535 if (r_typ == R_MIPS_HI16)
1536 return 1; /* skip this */
1537 inst = TO_NATIVE(*location);
1538 switch (r_typ) {
1539 case R_MIPS_LO16:
1540 r->r_addend = inst & 0xffff;
1541 break;
1542 case R_MIPS_26:
1543 r->r_addend = (inst & 0x03ffffff) << 2;
1544 break;
1545 case R_MIPS_32:
1546 r->r_addend = inst;
1547 break;
1548 }
1549 return 0;
1550}
1551
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001552static void section_rela(const char *modname, struct elf_info *elf,
Sam Ravnborg10668222008-01-13 22:21:31 +01001553 Elf_Shdr *sechdr)
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001554{
1555 Elf_Sym *sym;
1556 Elf_Rela *rela;
1557 Elf_Rela r;
1558 unsigned int r_sym;
1559 const char *fromsec;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001560
Sam Ravnborgff13f922008-01-23 19:54:27 +01001561 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001562 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1563
Sam Ravnborgff13f922008-01-23 19:54:27 +01001564 fromsec = sech_name(elf, sechdr);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001565 fromsec += strlen(".rela");
1566 /* if from section (name) is know good then skip it */
Anders Kaseorgb614a692009-04-23 16:49:33 -04001567 if (match(fromsec, section_white_list))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001568 return;
Sam Ravnborge241a632008-01-28 20:13:13 +01001569
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001570 for (rela = start; rela < stop; rela++) {
1571 r.r_offset = TO_NATIVE(rela->r_offset);
1572#if KERNEL_ELFCLASS == ELFCLASS64
Sam Ravnborgff13f922008-01-23 19:54:27 +01001573 if (elf->hdr->e_machine == EM_MIPS) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001574 unsigned int r_typ;
1575 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1576 r_sym = TO_NATIVE(r_sym);
1577 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1578 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1579 } else {
1580 r.r_info = TO_NATIVE(rela->r_info);
1581 r_sym = ELF_R_SYM(r.r_info);
1582 }
1583#else
1584 r.r_info = TO_NATIVE(rela->r_info);
1585 r_sym = ELF_R_SYM(r.r_info);
1586#endif
1587 r.r_addend = TO_NATIVE(rela->r_addend);
1588 sym = elf->symtab_start + r_sym;
1589 /* Skip special sections */
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001590 if (is_shndx_special(sym->st_shndx))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001591 continue;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001592 check_section_mismatch(modname, elf, &r, sym, fromsec);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001593 }
1594}
1595
1596static void section_rel(const char *modname, struct elf_info *elf,
Sam Ravnborg10668222008-01-13 22:21:31 +01001597 Elf_Shdr *sechdr)
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001598{
1599 Elf_Sym *sym;
1600 Elf_Rel *rel;
1601 Elf_Rela r;
1602 unsigned int r_sym;
1603 const char *fromsec;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001604
Sam Ravnborgff13f922008-01-23 19:54:27 +01001605 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001606 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1607
Sam Ravnborgff13f922008-01-23 19:54:27 +01001608 fromsec = sech_name(elf, sechdr);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001609 fromsec += strlen(".rel");
1610 /* if from section (name) is know good then skip it */
Anders Kaseorgb614a692009-04-23 16:49:33 -04001611 if (match(fromsec, section_white_list))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001612 return;
1613
1614 for (rel = start; rel < stop; rel++) {
1615 r.r_offset = TO_NATIVE(rel->r_offset);
1616#if KERNEL_ELFCLASS == ELFCLASS64
Sam Ravnborgff13f922008-01-23 19:54:27 +01001617 if (elf->hdr->e_machine == EM_MIPS) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001618 unsigned int r_typ;
1619 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1620 r_sym = TO_NATIVE(r_sym);
1621 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1622 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1623 } else {
1624 r.r_info = TO_NATIVE(rel->r_info);
1625 r_sym = ELF_R_SYM(r.r_info);
1626 }
1627#else
1628 r.r_info = TO_NATIVE(rel->r_info);
1629 r_sym = ELF_R_SYM(r.r_info);
1630#endif
1631 r.r_addend = 0;
Sam Ravnborgff13f922008-01-23 19:54:27 +01001632 switch (elf->hdr->e_machine) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001633 case EM_386:
1634 if (addend_386_rel(elf, sechdr, &r))
1635 continue;
1636 break;
1637 case EM_ARM:
1638 if (addend_arm_rel(elf, sechdr, &r))
1639 continue;
1640 break;
1641 case EM_MIPS:
1642 if (addend_mips_rel(elf, sechdr, &r))
1643 continue;
1644 break;
1645 }
1646 sym = elf->symtab_start + r_sym;
1647 /* Skip special sections */
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001648 if (is_shndx_special(sym->st_shndx))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001649 continue;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001650 check_section_mismatch(modname, elf, &r, sym, fromsec);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001651 }
1652}
1653
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001654/**
1655 * A module includes a number of sections that are discarded
1656 * either when loaded or when used as built-in.
1657 * For loaded modules all functions marked __init and all data
Uwe Kleine-Königb5950762010-11-01 15:38:34 -04001658 * marked __initdata will be discarded when the module has been initialized.
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001659 * Likewise for modules used built-in the sections marked __exit
1660 * are discarded because __exit marked function are supposed to be called
Ben Dooks32be1d22008-07-29 22:33:44 -07001661 * only when a module is unloaded which never happens for built-in modules.
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001662 * The check_sec_ref() function traverses all relocation records
1663 * to find all references to a section that reference a section that will
1664 * be discarded and warns about it.
1665 **/
1666static void check_sec_ref(struct module *mod, const char *modname,
Sam Ravnborg10668222008-01-13 22:21:31 +01001667 struct elf_info *elf)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001668{
1669 int i;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001670 Elf_Shdr *sechdrs = elf->sechdrs;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001671
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001672 /* Walk through all sections */
Denys Vlasenko1ce53ad2010-07-29 01:47:53 +02001673 for (i = 0; i < elf->num_sections; i++) {
Anders Kaseorgb614a692009-04-23 16:49:33 -04001674 check_section(modname, elf, &elf->sechdrs[i]);
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001675 /* We want to process only relocation sections and not .init */
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001676 if (sechdrs[i].sh_type == SHT_RELA)
Sam Ravnborg10668222008-01-13 22:21:31 +01001677 section_rela(modname, elf, &elf->sechdrs[i]);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001678 else if (sechdrs[i].sh_type == SHT_REL)
Sam Ravnborg10668222008-01-13 22:21:31 +01001679 section_rel(modname, elf, &elf->sechdrs[i]);
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001680 }
1681}
1682
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001683static void read_symbols(char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684{
1685 const char *symname;
1686 char *version;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001687 char *license;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 struct module *mod;
1689 struct elf_info info = { };
1690 Elf_Sym *sym;
1691
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +01001692 if (!parse_elf(&info, modname))
1693 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694
1695 mod = new_module(modname);
1696
1697 /* When there's no vmlinux, don't print warnings about
1698 * unresolved symbols (since there'll be too many ;) */
1699 if (is_vmlinux(modname)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 have_vmlinux = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 mod->skip = 1;
1702 }
1703
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001704 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
Sam Ravnborg2fa36562008-04-26 21:07:26 +02001705 if (info.modinfo && !license && !is_vmlinux(modname))
1706 warn("modpost: missing MODULE_LICENSE() in %s\n"
1707 "see include/linux/module.h for "
1708 "more information\n", modname);
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001709 while (license) {
1710 if (license_is_gpl_compatible(license))
1711 mod->gpl_compatible = 1;
1712 else {
1713 mod->gpl_compatible = 0;
1714 break;
1715 }
1716 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1717 "license", license);
1718 }
1719
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1721 symname = info.strtab + sym->st_name;
1722
1723 handle_modversions(mod, &info, sym, symname);
1724 handle_moddevtable(mod, &info, sym, symname);
1725 }
Sam Ravnborgd1f25e62008-01-17 21:17:42 +01001726 if (!is_vmlinux(modname) ||
Sam Ravnborg10668222008-01-13 22:21:31 +01001727 (is_vmlinux(modname) && vmlinux_section_warnings))
1728 check_sec_ref(mod, modname, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
1730 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1731 if (version)
1732 maybe_frob_rcs_version(modname, version, info.modinfo,
1733 version - (char *)info.hdr);
1734 if (version || (all_versions && !is_vmlinux(modname)))
1735 get_src_version(modname, mod->srcversion,
1736 sizeof(mod->srcversion)-1);
1737
1738 parse_elf_finish(&info);
1739
Rusty Russell8c8ef422009-03-31 13:05:34 -06001740 /* Our trick to get versioning for module struct etc. - it's
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 * never passed as an argument to an exported function, so
1742 * the automatic versioning doesn't pick it up, but it's really
1743 * important anyhow */
1744 if (modversions)
Rusty Russell8c8ef422009-03-31 13:05:34 -06001745 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746}
1747
Rusty Russell712f9b42013-04-04 17:37:38 +10301748static void read_symbols_from_files(const char *filename)
1749{
1750 FILE *in = stdin;
1751 char fname[PATH_MAX];
1752
1753 if (strcmp(filename, "-") != 0) {
1754 in = fopen(filename, "r");
1755 if (!in)
1756 fatal("Can't open filenames file %s: %m", filename);
1757 }
1758
1759 while (fgets(fname, PATH_MAX, in) != NULL) {
1760 if (strends(fname, "\n"))
1761 fname[strlen(fname)-1] = '\0';
1762 read_symbols(fname);
1763 }
1764
1765 if (in != stdin)
1766 fclose(in);
1767}
1768
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769#define SZ 500
1770
1771/* We first write the generated file into memory using the
1772 * following helper, then compare to the file on disk and
1773 * only update the later if anything changed */
1774
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001775void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1776 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777{
1778 char tmp[SZ];
1779 int len;
1780 va_list ap;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001781
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 va_start(ap, fmt);
1783 len = vsnprintf(tmp, SZ, fmt, ap);
Sam Ravnborg7670f022006-03-16 23:04:08 -08001784 buf_write(buf, tmp, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 va_end(ap);
1786}
1787
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001788void buf_write(struct buffer *buf, const char *s, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789{
1790 if (buf->size - buf->pos < len) {
Sam Ravnborg7670f022006-03-16 23:04:08 -08001791 buf->size += len + SZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 buf->p = realloc(buf->p, buf->size);
1793 }
1794 strncpy(buf->p + buf->pos, s, len);
1795 buf->pos += len;
1796}
1797
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001798static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1799{
1800 const char *e = is_vmlinux(m) ?"":".ko";
1801
1802 switch (exp) {
1803 case export_gpl:
1804 fatal("modpost: GPL-incompatible module %s%s "
1805 "uses GPL-only symbol '%s'\n", m, e, s);
1806 break;
1807 case export_unused_gpl:
1808 fatal("modpost: GPL-incompatible module %s%s "
1809 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1810 break;
1811 case export_gpl_future:
1812 warn("modpost: GPL-incompatible module %s%s "
1813 "uses future GPL-only symbol '%s'\n", m, e, s);
1814 break;
1815 case export_plain:
1816 case export_unused:
1817 case export_unknown:
1818 /* ignore */
1819 break;
1820 }
1821}
1822
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001823static void check_for_unused(enum export exp, const char *m, const char *s)
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001824{
1825 const char *e = is_vmlinux(m) ?"":".ko";
1826
1827 switch (exp) {
1828 case export_unused:
1829 case export_unused_gpl:
1830 warn("modpost: module %s%s "
1831 "uses symbol '%s' marked UNUSED\n", m, e, s);
1832 break;
1833 default:
1834 /* ignore */
1835 break;
1836 }
1837}
1838
1839static void check_exports(struct module *mod)
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001840{
1841 struct symbol *s, *exp;
1842
1843 for (s = mod->unres; s; s = s->next) {
Andrew Morton6449bd62006-06-09 20:45:06 -07001844 const char *basename;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001845 exp = find_symbol(s->name);
1846 if (!exp || exp->module == mod)
1847 continue;
Andrew Morton6449bd62006-06-09 20:45:06 -07001848 basename = strrchr(mod->name, '/');
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001849 if (basename)
1850 basename++;
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001851 else
1852 basename = mod->name;
1853 if (!mod->gpl_compatible)
1854 check_for_gpl_usage(exp->export, basename, exp->name);
1855 check_for_unused(exp->export, basename, exp->name);
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001856 }
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001857}
1858
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001859/**
1860 * Header for the generated file
1861 **/
1862static void add_header(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863{
1864 buf_printf(b, "#include <linux/module.h>\n");
1865 buf_printf(b, "#include <linux/vermagic.h>\n");
1866 buf_printf(b, "#include <linux/compiler.h>\n");
1867 buf_printf(b, "\n");
1868 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1869 buf_printf(b, "\n");
Andi Kleene0f244c2013-10-23 10:57:58 +10301870 buf_printf(b, "__visible struct module __this_module\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
Greg Kroah-Hartman3c7ec942012-04-25 11:10:15 -07001872 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 if (mod->has_init)
Greg Kroah-Hartman3c7ec942012-04-25 11:10:15 -07001874 buf_printf(b, "\t.init = init_module,\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 if (mod->has_cleanup)
1876 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
Greg Kroah-Hartman3c7ec942012-04-25 11:10:15 -07001877 "\t.exit = cleanup_module,\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 "#endif\n");
Greg Kroah-Hartman3c7ec942012-04-25 11:10:15 -07001879 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 buf_printf(b, "};\n");
1881}
1882
Ben Hutchings2449b8b2011-10-24 15:12:28 +02001883static void add_intree_flag(struct buffer *b, int is_intree)
1884{
1885 if (is_intree)
1886 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
1887}
1888
Trevor Keith5c725132009-09-22 16:43:38 -07001889static void add_staging_flag(struct buffer *b, const char *name)
Greg Kroah-Hartmana9860bf2008-09-24 14:46:44 -07001890{
1891 static const char *staging_dir = "drivers/staging";
1892
1893 if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
1894 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
1895}
1896
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001897/**
1898 * Record CRCs for unresolved symbols
1899 **/
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001900static int add_versions(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901{
1902 struct symbol *s, *exp;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001903 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904
1905 for (s = mod->unres; s; s = s->next) {
1906 exp = find_symbol(s->name);
1907 if (!exp || exp->module == mod) {
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001908 if (have_vmlinux && !s->weak) {
Matthew Wilcox2a116652006-10-07 05:35:32 -06001909 if (warn_unresolved) {
1910 warn("\"%s\" [%s.ko] undefined!\n",
1911 s->name, mod->name);
1912 } else {
1913 merror("\"%s\" [%s.ko] undefined!\n",
1914 s->name, mod->name);
1915 err = 1;
1916 }
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 continue;
1919 }
1920 s->module = exp->module;
1921 s->crc_valid = exp->crc_valid;
1922 s->crc = exp->crc;
1923 }
1924
1925 if (!modversions)
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001926 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927
1928 buf_printf(b, "\n");
1929 buf_printf(b, "static const struct modversion_info ____versions[]\n");
Adrian Bunk3ff6eec2008-01-24 22:16:20 +01001930 buf_printf(b, "__used\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1932
1933 for (s = mod->unres; s; s = s->next) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001934 if (!s->module)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 if (!s->crc_valid) {
Sam Ravnborgcb805142006-01-28 16:57:26 +01001937 warn("\"%s\" [%s.ko] has no CRC!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 s->name, mod->name);
1939 continue;
1940 }
James Hogana53a11f32013-04-29 11:36:59 +09301941 buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
James Hogana4b6a772013-03-18 19:38:56 +10301942 s->crc, s->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 }
1944
1945 buf_printf(b, "};\n");
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001946
1947 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948}
1949
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001950static void add_depends(struct buffer *b, struct module *mod,
1951 struct module *modules)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952{
1953 struct symbol *s;
1954 struct module *m;
1955 int first = 1;
1956
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001957 for (m = modules; m; m = m->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 m->seen = is_vmlinux(m->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959
1960 buf_printf(b, "\n");
1961 buf_printf(b, "static const char __module_depends[]\n");
Adrian Bunk3ff6eec2008-01-24 22:16:20 +01001962 buf_printf(b, "__used\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1964 buf_printf(b, "\"depends=");
1965 for (s = mod->unres; s; s = s->next) {
Sam Ravnborga61b2df2007-02-26 19:46:52 +01001966 const char *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 if (!s->module)
1968 continue;
1969
1970 if (s->module->seen)
1971 continue;
1972
1973 s->module->seen = 1;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001974 p = strrchr(s->module->name, '/');
1975 if (p)
Sam Ravnborga61b2df2007-02-26 19:46:52 +01001976 p++;
1977 else
1978 p = s->module->name;
1979 buf_printf(b, "%s%s", first ? "" : ",", p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 first = 0;
1981 }
1982 buf_printf(b, "\";\n");
1983}
1984
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001985static void add_srcversion(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986{
1987 if (mod->srcversion[0]) {
1988 buf_printf(b, "\n");
1989 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1990 mod->srcversion);
1991 }
1992}
1993
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001994static void write_if_changed(struct buffer *b, const char *fname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995{
1996 char *tmp;
1997 FILE *file;
1998 struct stat st;
1999
2000 file = fopen(fname, "r");
2001 if (!file)
2002 goto write;
2003
2004 if (fstat(fileno(file), &st) < 0)
2005 goto close_write;
2006
2007 if (st.st_size != b->pos)
2008 goto close_write;
2009
2010 tmp = NOFAIL(malloc(b->pos));
2011 if (fread(tmp, 1, b->pos, file) != b->pos)
2012 goto free_write;
2013
2014 if (memcmp(tmp, b->p, b->pos) != 0)
2015 goto free_write;
2016
2017 free(tmp);
2018 fclose(file);
2019 return;
2020
2021 free_write:
2022 free(tmp);
2023 close_write:
2024 fclose(file);
2025 write:
2026 file = fopen(fname, "w");
2027 if (!file) {
2028 perror(fname);
2029 exit(1);
2030 }
2031 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2032 perror(fname);
2033 exit(1);
2034 }
2035 fclose(file);
2036}
2037
Ram Paibd5cbce2006-06-08 22:12:53 -07002038/* parse Module.symvers file. line format:
Sam Ravnborg534b89a2006-07-01 10:10:19 +02002039 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
Ram Paibd5cbce2006-06-08 22:12:53 -07002040 **/
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002041static void read_dump(const char *fname, unsigned int kernel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042{
2043 unsigned long size, pos = 0;
2044 void *file = grab_file(fname, &size);
2045 char *line;
2046
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002047 if (!file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 /* No symbol versions, silently ignore */
2049 return;
2050
2051 while ((line = get_next_line(&pos, file, size))) {
Sam Ravnborg534b89a2006-07-01 10:10:19 +02002052 char *symname, *modname, *d, *export, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 unsigned int crc;
2054 struct module *mod;
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002055 struct symbol *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
2057 if (!(symname = strchr(line, '\t')))
2058 goto fail;
2059 *symname++ = '\0';
2060 if (!(modname = strchr(symname, '\t')))
2061 goto fail;
2062 *modname++ = '\0';
Laurent Riffard9ac545b2006-06-11 08:02:06 +02002063 if ((export = strchr(modname, '\t')) != NULL)
Ram Paibd5cbce2006-06-08 22:12:53 -07002064 *export++ = '\0';
Sam Ravnborg534b89a2006-07-01 10:10:19 +02002065 if (export && ((end = strchr(export, '\t')) != NULL))
2066 *end = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 crc = strtoul(line, &d, 16);
2068 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2069 goto fail;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002070 mod = find_module(modname);
2071 if (!mod) {
2072 if (is_vmlinux(modname))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 have_vmlinux = 1;
Jan Beulich0fa3a882009-03-12 12:28:30 +00002074 mod = new_module(modname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 mod->skip = 1;
2076 }
Ram Paibd5cbce2006-06-08 22:12:53 -07002077 s = sym_add_exported(symname, mod, export_no(export));
Sam Ravnborg8e70c452006-01-28 22:22:33 +01002078 s->kernel = kernel;
2079 s->preloaded = 1;
Ram Paibd5cbce2006-06-08 22:12:53 -07002080 sym_update_crc(symname, mod, crc, export_no(export));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 }
2082 return;
2083fail:
2084 fatal("parse error in symbol dump file\n");
2085}
2086
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002087/* For normal builds always dump all symbols.
2088 * For external modules only dump symbols
2089 * that are not read from kernel Module.symvers.
2090 **/
2091static int dump_sym(struct symbol *sym)
2092{
2093 if (!external_module)
2094 return 1;
2095 if (sym->vmlinux || sym->kernel)
2096 return 0;
2097 return 1;
2098}
Sam Ravnborg62070fa2006-03-03 16:46:04 +01002099
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01002100static void write_dump(const char *fname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101{
2102 struct buffer buf = { };
2103 struct symbol *symbol;
2104 int n;
2105
2106 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2107 symbol = symbolhash[n];
2108 while (symbol) {
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002109 if (dump_sym(symbol))
Ram Paibd5cbce2006-06-08 22:12:53 -07002110 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
Sam Ravnborg62070fa2006-03-03 16:46:04 +01002111 symbol->crc, symbol->name,
Ram Paibd5cbce2006-06-08 22:12:53 -07002112 symbol->module->name,
2113 export_str(symbol->export));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 symbol = symbol->next;
2115 }
2116 }
2117 write_if_changed(&buf, fname);
2118}
2119
Richard Hacker2d04b5a2008-02-28 09:40:52 +01002120struct ext_sym_list {
2121 struct ext_sym_list *next;
2122 const char *file;
2123};
2124
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01002125int main(int argc, char **argv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126{
2127 struct module *mod;
2128 struct buffer buf = { };
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002129 char *kernel_read = NULL, *module_read = NULL;
Rusty Russell712f9b42013-04-04 17:37:38 +10302130 char *dump_write = NULL, *files_source = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 int opt;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07002132 int err;
Richard Hacker2d04b5a2008-02-28 09:40:52 +01002133 struct ext_sym_list *extsym_iter;
2134 struct ext_sym_list *extsym_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
Guenter Roeckeed380f2013-09-23 15:23:54 +09302136 while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:")) != -1) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002137 switch (opt) {
2138 case 'i':
2139 kernel_read = optarg;
2140 break;
2141 case 'I':
2142 module_read = optarg;
2143 external_module = 1;
2144 break;
Richard Hacker2d04b5a2008-02-28 09:40:52 +01002145 case 'e':
2146 external_module = 1;
2147 extsym_iter =
2148 NOFAIL(malloc(sizeof(*extsym_iter)));
2149 extsym_iter->next = extsym_start;
2150 extsym_iter->file = optarg;
2151 extsym_start = extsym_iter;
2152 break;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002153 case 'm':
2154 modversions = 1;
2155 break;
Guenter Roeckeed380f2013-09-23 15:23:54 +09302156 case 'n':
2157 ignore_missing_files = 1;
2158 break;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002159 case 'o':
2160 dump_write = optarg;
2161 break;
2162 case 'a':
2163 all_versions = 1;
2164 break;
2165 case 's':
2166 vmlinux_section_warnings = 0;
2167 break;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01002168 case 'S':
2169 sec_mismatch_verbose = 0;
2170 break;
Rusty Russell712f9b42013-04-04 17:37:38 +10302171 case 'T':
2172 files_source = optarg;
2173 break;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002174 case 'w':
2175 warn_unresolved = 1;
2176 break;
2177 default:
2178 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 }
2180 }
2181
Sam Ravnborg040fcc82006-01-28 22:15:55 +01002182 if (kernel_read)
2183 read_dump(kernel_read, 1);
2184 if (module_read)
2185 read_dump(module_read, 0);
Richard Hacker2d04b5a2008-02-28 09:40:52 +01002186 while (extsym_start) {
2187 read_dump(extsym_start->file, 0);
2188 extsym_iter = extsym_start->next;
2189 free(extsym_start);
2190 extsym_start = extsym_iter;
2191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192
Sam Ravnborgdf578e72008-01-11 19:17:15 +01002193 while (optind < argc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 read_symbols(argv[optind++]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195
Rusty Russell712f9b42013-04-04 17:37:38 +10302196 if (files_source)
2197 read_symbols_from_files(files_source);
2198
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 for (mod = modules; mod; mod = mod->next) {
2200 if (mod->skip)
2201 continue;
Sam Ravnborgc96fca22006-07-01 11:44:23 +02002202 check_exports(mod);
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02002203 }
2204
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07002205 err = 0;
2206
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02002207 for (mod = modules; mod; mod = mod->next) {
Andi Kleen666ab412007-11-22 03:43:10 +01002208 char fname[strlen(mod->name) + 10];
2209
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02002210 if (mod->skip)
2211 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212
2213 buf.pos = 0;
2214
2215 add_header(&buf, mod);
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002216 add_intree_flag(&buf, !external_module);
Greg Kroah-Hartmana9860bf2008-09-24 14:46:44 -07002217 add_staging_flag(&buf, mod->name);
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07002218 err |= add_versions(&buf, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219 add_depends(&buf, mod, modules);
2220 add_moddevtable(&buf, mod);
2221 add_srcversion(&buf, mod);
2222
2223 sprintf(fname, "%s.mod.c", mod->name);
2224 write_if_changed(&buf, fname);
2225 }
2226
2227 if (dump_write)
2228 write_dump(dump_write);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01002229 if (sec_mismatch_count && !sec_mismatch_verbose)
Geert Uytterhoeven7c0ac492008-02-05 11:38:49 +01002230 warn("modpost: Found %d section mismatch(es).\n"
2231 "To see full details build your kernel with:\n"
2232 "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
2233 sec_mismatch_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07002235 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236}