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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
14#include <ctype.h>
15#include "modpost.h"
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020016#include "../../include/linux/license.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18/* Are we using CONFIG_MODVERSIONS? */
19int modversions = 0;
20/* Warn about undefined symbols? (do so if we have vmlinux) */
21int have_vmlinux = 0;
22/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
23static int all_versions = 0;
Sam Ravnborg040fcc82006-01-28 22:15:55 +010024/* If we are modposting external module set to 1 */
25static int external_module = 0;
Sam Ravnborg8d8d8282007-07-20 22:36:56 +020026/* Warn about section mismatch in vmlinux if set to 1 */
27static int vmlinux_section_warnings = 1;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -070028/* Only warn about unresolved symbols */
29static int warn_unresolved = 0;
Ram Paibd5cbce2006-06-08 22:12:53 -070030/* How a symbol is exported */
Sam Ravnborg588ccd72008-01-24 21:12:37 +010031static int sec_mismatch_count = 0;
32static int sec_mismatch_verbose = 1;
33
Sam Ravnborgc96fca22006-07-01 11:44:23 +020034enum export {
35 export_plain, export_unused, export_gpl,
36 export_unused_gpl, export_gpl_future, export_unknown
37};
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Andi Kleen6d9a89e2007-11-22 03:43:08 +010039#define PRINTF __attribute__ ((format (printf, 1, 2)))
40
41PRINTF void fatal(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 va_list arglist;
44
45 fprintf(stderr, "FATAL: ");
46
47 va_start(arglist, fmt);
48 vfprintf(stderr, fmt, arglist);
49 va_end(arglist);
50
51 exit(1);
52}
53
Andi Kleen6d9a89e2007-11-22 03:43:08 +010054PRINTF void warn(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
56 va_list arglist;
57
58 fprintf(stderr, "WARNING: ");
59
60 va_start(arglist, fmt);
61 vfprintf(stderr, fmt, arglist);
62 va_end(arglist);
63}
64
Andi Kleen6d9a89e2007-11-22 03:43:08 +010065PRINTF void merror(const char *fmt, ...)
Matthew Wilcox2a116652006-10-07 05:35:32 -060066{
67 va_list arglist;
68
69 fprintf(stderr, "ERROR: ");
70
71 va_start(arglist, fmt);
72 vfprintf(stderr, fmt, arglist);
73 va_end(arglist);
74}
75
Sam Ravnborg040fcc82006-01-28 22:15:55 +010076static int is_vmlinux(const char *modname)
77{
78 const char *myname;
79
Sam Ravnborgdf578e72008-01-11 19:17:15 +010080 myname = strrchr(modname, '/');
81 if (myname)
Sam Ravnborg040fcc82006-01-28 22:15:55 +010082 myname++;
83 else
84 myname = modname;
85
Sam Ravnborg741f98f2007-07-17 10:54:06 +020086 return (strcmp(myname, "vmlinux") == 0) ||
87 (strcmp(myname, "vmlinux.o") == 0);
Sam Ravnborg040fcc82006-01-28 22:15:55 +010088}
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090void *do_nofail(void *ptr, const char *expr)
91{
Sam Ravnborgdf578e72008-01-11 19:17:15 +010092 if (!ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 fatal("modpost: Memory allocation failure: %s.\n", expr);
Sam Ravnborgdf578e72008-01-11 19:17:15 +010094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 return ptr;
96}
97
98/* A list of all modules we processed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070099static struct module *modules;
100
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100101static struct module *find_module(char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 struct module *mod;
104
105 for (mod = modules; mod; mod = mod->next)
106 if (strcmp(mod->name, modname) == 0)
107 break;
108 return mod;
109}
110
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100111static struct module *new_module(char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
113 struct module *mod;
114 char *p, *s;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 mod = NOFAIL(malloc(sizeof(*mod)));
117 memset(mod, 0, sizeof(*mod));
118 p = NOFAIL(strdup(modname));
119
120 /* strip trailing .o */
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100121 s = strrchr(p, '.');
122 if (s != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (strcmp(s, ".o") == 0)
124 *s = '\0';
125
126 /* add to list */
127 mod->name = p;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200128 mod->gpl_compatible = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 mod->next = modules;
130 modules = mod;
131
132 return mod;
133}
134
135/* A hash of all exported symbols,
136 * struct symbol is also used for lists of unresolved symbols */
137
138#define SYMBOL_HASH_SIZE 1024
139
140struct symbol {
141 struct symbol *next;
142 struct module *module;
143 unsigned int crc;
144 int crc_valid;
145 unsigned int weak:1;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100146 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
147 unsigned int kernel:1; /* 1 if symbol is from kernel
148 * (only for external modules) **/
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100149 unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
Ram Paibd5cbce2006-06-08 22:12:53 -0700150 enum export export; /* Type of export */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 char name[0];
152};
153
154static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
155
156/* This is based on the hash agorithm from gdbm, via tdb */
157static inline unsigned int tdb_hash(const char *name)
158{
159 unsigned value; /* Used to compute the hash value. */
160 unsigned i; /* Used to cycle through random values. */
161
162 /* Set the initial value from the key size. */
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100163 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
165
166 return (1103515243 * value + 12345);
167}
168
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100169/**
170 * Allocate a new symbols for use in the hash of exported symbols or
171 * the list of unresolved symbols per module
172 **/
173static struct symbol *alloc_symbol(const char *name, unsigned int weak,
174 struct symbol *next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
177
178 memset(s, 0, sizeof(*s));
179 strcpy(s->name, name);
180 s->weak = weak;
181 s->next = next;
182 return s;
183}
184
185/* For the hash of exported symbols */
Ram Paibd5cbce2006-06-08 22:12:53 -0700186static struct symbol *new_symbol(const char *name, struct module *module,
187 enum export export)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 unsigned int hash;
190 struct symbol *new;
191
192 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
193 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
194 new->module = module;
Ram Paibd5cbce2006-06-08 22:12:53 -0700195 new->export = export;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100196 return new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100199static struct symbol *find_symbol(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 struct symbol *s;
202
203 /* For our purposes, .foo matches foo. PPC64 needs this. */
204 if (name[0] == '.')
205 name++;
206
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100207 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (strcmp(s->name, name) == 0)
209 return s;
210 }
211 return NULL;
212}
213
Ram Paibd5cbce2006-06-08 22:12:53 -0700214static struct {
215 const char *str;
216 enum export export;
217} export_list[] = {
218 { .str = "EXPORT_SYMBOL", .export = export_plain },
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200219 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
Ram Paibd5cbce2006-06-08 22:12:53 -0700220 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200221 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
Ram Paibd5cbce2006-06-08 22:12:53 -0700222 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
223 { .str = "(unknown)", .export = export_unknown },
224};
225
226
227static const char *export_str(enum export ex)
228{
229 return export_list[ex].str;
230}
231
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100232static enum export export_no(const char *s)
Ram Paibd5cbce2006-06-08 22:12:53 -0700233{
234 int i;
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100235
Sam Ravnborg534b89a2006-07-01 10:10:19 +0200236 if (!s)
237 return export_unknown;
Ram Paibd5cbce2006-06-08 22:12:53 -0700238 for (i = 0; export_list[i].export != export_unknown; i++) {
239 if (strcmp(export_list[i].str, s) == 0)
240 return export_list[i].export;
241 }
242 return export_unknown;
243}
244
245static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
246{
247 if (sec == elf->export_sec)
248 return export_plain;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200249 else if (sec == elf->export_unused_sec)
250 return export_unused;
Ram Paibd5cbce2006-06-08 22:12:53 -0700251 else if (sec == elf->export_gpl_sec)
252 return export_gpl;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200253 else if (sec == elf->export_unused_gpl_sec)
254 return export_unused_gpl;
Ram Paibd5cbce2006-06-08 22:12:53 -0700255 else if (sec == elf->export_gpl_future_sec)
256 return export_gpl_future;
257 else
258 return export_unknown;
259}
260
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100261/**
262 * Add an exported symbol - it may have already been added without a
263 * CRC, in this case just update the CRC
264 **/
Ram Paibd5cbce2006-06-08 22:12:53 -0700265static struct symbol *sym_add_exported(const char *name, struct module *mod,
266 enum export export)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 struct symbol *s = find_symbol(name);
269
270 if (!s) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700271 s = new_symbol(name, mod, export);
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100272 } else {
273 if (!s->preloaded) {
Sam Ravnborg7b75b132006-03-05 13:48:58 +0100274 warn("%s: '%s' exported twice. Previous export "
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100275 "was in %s%s\n", mod->name, name,
276 s->module->name,
277 is_vmlinux(s->module->name) ?"":".ko");
Trent Piepho4b219602007-10-11 16:40:10 -0700278 } else {
279 /* In case Modules.symvers was out of date */
280 s->module = mod;
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
Sam Ravnborg8e70c452006-01-28 22:22:33 +0100283 s->preloaded = 0;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100284 s->vmlinux = is_vmlinux(mod->name);
285 s->kernel = 0;
Ram Paibd5cbce2006-06-08 22:12:53 -0700286 s->export = export;
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100287 return s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100290static void sym_update_crc(const char *name, struct module *mod,
Ram Paibd5cbce2006-06-08 22:12:53 -0700291 unsigned int crc, enum export export)
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100292{
293 struct symbol *s = find_symbol(name);
294
295 if (!s)
Ram Paibd5cbce2006-06-08 22:12:53 -0700296 s = new_symbol(name, mod, export);
Sam Ravnborg040fcc82006-01-28 22:15:55 +0100297 s->crc = crc;
298 s->crc_valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100301void *grab_file(const char *filename, unsigned long *size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct stat st;
304 void *map;
305 int fd;
306
307 fd = open(filename, O_RDONLY);
308 if (fd < 0 || fstat(fd, &st) != 0)
309 return NULL;
310
311 *size = st.st_size;
312 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
313 close(fd);
314
315 if (map == MAP_FAILED)
316 return NULL;
317 return map;
318}
319
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100320/**
321 * Return a copy of the next line in a mmap'ed file.
322 * spaces in the beginning of the line is trimmed away.
323 * Return a pointer to a static buffer.
324 **/
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100325char *get_next_line(unsigned long *pos, void *file, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
327 static char line[4096];
328 int skip = 1;
329 size_t len = 0;
330 signed char *p = (signed char *)file + *pos;
331 char *s = line;
332
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100333 for (; *pos < size ; (*pos)++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (skip && isspace(*p)) {
335 p++;
336 continue;
337 }
338 skip = 0;
339 if (*p != '\n' && (*pos < size)) {
340 len++;
341 *s++ = *p++;
342 if (len > 4095)
343 break; /* Too long, stop */
344 } else {
345 /* End of string */
346 *s = '\0';
347 return line;
348 }
349 }
350 /* End of buffer */
351 return NULL;
352}
353
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100354void release_file(void *file, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
356 munmap(file, size);
357}
358
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100359static int parse_elf(struct elf_info *info, const char *filename)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 unsigned int i;
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100362 Elf_Ehdr *hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 Elf_Shdr *sechdrs;
364 Elf_Sym *sym;
365
366 hdr = grab_file(filename, &info->size);
367 if (!hdr) {
368 perror(filename);
Sam Ravnborg6803dc02006-06-24 23:46:54 +0200369 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371 info->hdr = hdr;
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100372 if (info->size < sizeof(*hdr)) {
373 /* file too small, assume this is an empty .o file */
374 return 0;
375 }
376 /* Is this a valid ELF file? */
377 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
378 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
379 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
380 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
381 /* Not an ELF file - silently ignore it */
382 return 0;
383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 /* Fix endianness in ELF header */
385 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
386 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
387 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
388 hdr->e_machine = TO_NATIVE(hdr->e_machine);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +0900389 hdr->e_type = TO_NATIVE(hdr->e_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 sechdrs = (void *)hdr + hdr->e_shoff;
391 info->sechdrs = sechdrs;
392
Petr Stetiara83710e2007-08-27 12:15:07 +0200393 /* Check if file offset is correct */
394 if (hdr->e_shoff > info->size) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100395 fatal("section header offset=%lu in file '%s' is bigger than "
396 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
397 filename, info->size);
Petr Stetiara83710e2007-08-27 12:15:07 +0200398 return 0;
399 }
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 /* Fix endianness in section headers */
402 for (i = 0; i < hdr->e_shnum; i++) {
403 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
404 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
405 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
406 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
407 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +0900408 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
409 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 }
411 /* Find symbol table. */
412 for (i = 1; i < hdr->e_shnum; i++) {
413 const char *secstrings
414 = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
Ram Paibd5cbce2006-06-08 22:12:53 -0700415 const char *secname;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100417 if (sechdrs[i].sh_offset > info->size) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100418 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
419 "sizeof(*hrd)=%zu\n", filename,
420 (unsigned long)sechdrs[i].sh_offset,
421 sizeof(*hdr));
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100422 return 0;
423 }
Ram Paibd5cbce2006-06-08 22:12:53 -0700424 secname = secstrings + sechdrs[i].sh_name;
425 if (strcmp(secname, ".modinfo") == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
427 info->modinfo_len = sechdrs[i].sh_size;
Ram Paibd5cbce2006-06-08 22:12:53 -0700428 } else if (strcmp(secname, "__ksymtab") == 0)
429 info->export_sec = i;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200430 else if (strcmp(secname, "__ksymtab_unused") == 0)
431 info->export_unused_sec = i;
Ram Paibd5cbce2006-06-08 22:12:53 -0700432 else if (strcmp(secname, "__ksymtab_gpl") == 0)
433 info->export_gpl_sec = i;
Sam Ravnborgc96fca22006-07-01 11:44:23 +0200434 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
435 info->export_unused_gpl_sec = i;
Ram Paibd5cbce2006-06-08 22:12:53 -0700436 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
437 info->export_gpl_future_sec = i;
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (sechdrs[i].sh_type != SHT_SYMTAB)
440 continue;
441
442 info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100443 info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 + sechdrs[i].sh_size;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100445 info->strtab = (void *)hdr +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sechdrs[sechdrs[i].sh_link].sh_offset;
447 }
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100448 if (!info->symtab_start)
Sam Ravnborgcb805142006-01-28 16:57:26 +0100449 fatal("%s has no symtab?\n", filename);
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 /* Fix endianness in symbols */
452 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
453 sym->st_shndx = TO_NATIVE(sym->st_shndx);
454 sym->st_name = TO_NATIVE(sym->st_name);
455 sym->st_value = TO_NATIVE(sym->st_value);
456 sym->st_size = TO_NATIVE(sym->st_size);
457 }
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100458 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100461static void parse_elf_finish(struct elf_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
463 release_file(info->hdr, info->size);
464}
465
Luke Yangf7b05e62006-03-02 18:35:31 +0800466#define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
467#define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100469static void handle_modversions(struct module *mod, struct elf_info *info,
470 Elf_Sym *sym, const char *symname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 unsigned int crc;
Ram Paibd5cbce2006-06-08 22:12:53 -0700473 enum export export = export_from_sec(info, sym->st_shndx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 switch (sym->st_shndx) {
476 case SHN_COMMON:
Sam Ravnborgcb805142006-01-28 16:57:26 +0100477 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 break;
479 case SHN_ABS:
480 /* CRC'd symbol */
481 if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
482 crc = (unsigned int) sym->st_value;
Ram Paibd5cbce2006-06-08 22:12:53 -0700483 sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
484 export);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
486 break;
487 case SHN_UNDEF:
488 /* undefined symbol */
489 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
490 ELF_ST_BIND(sym->st_info) != STB_WEAK)
491 break;
492 /* ignore global offset table */
493 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
494 break;
495 /* ignore __this_module, it will be resolved shortly */
496 if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0)
497 break;
Ben Colline8d529012005-08-19 13:44:57 -0700498/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
499#if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
500/* add compatibility with older glibc */
501#ifndef STT_SPARC_REGISTER
502#define STT_SPARC_REGISTER STT_REGISTER
503#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 if (info->hdr->e_machine == EM_SPARC ||
505 info->hdr->e_machine == EM_SPARCV9) {
506 /* Ignore register directives. */
Ben Colline8d529012005-08-19 13:44:57 -0700507 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 break;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100509 if (symname[0] == '.') {
510 char *munged = strdup(symname);
511 munged[0] = '_';
512 munged[1] = toupper(munged[1]);
513 symname = munged;
514 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 }
516#endif
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (memcmp(symname, MODULE_SYMBOL_PREFIX,
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100519 strlen(MODULE_SYMBOL_PREFIX)) == 0) {
520 mod->unres =
521 alloc_symbol(symname +
522 strlen(MODULE_SYMBOL_PREFIX),
523 ELF_ST_BIND(sym->st_info) == STB_WEAK,
524 mod->unres);
525 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 break;
527 default:
528 /* All exported symbols */
529 if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
Ram Paibd5cbce2006-06-08 22:12:53 -0700530 sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
531 export);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
533 if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
534 mod->has_init = 1;
535 if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0)
536 mod->has_cleanup = 1;
537 break;
538 }
539}
540
Sam Ravnborg5c3ead82006-01-28 17:19:35 +0100541/**
542 * Parse tag=value strings from .modinfo section
543 **/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544static char *next_string(char *string, unsigned long *secsize)
545{
546 /* Skip non-zero chars */
547 while (string[0]) {
548 string++;
549 if ((*secsize)-- <= 1)
550 return NULL;
551 }
552
553 /* Skip any zero padding. */
554 while (!string[0]) {
555 string++;
556 if ((*secsize)-- <= 1)
557 return NULL;
558 }
559 return string;
560}
561
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200562static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
563 const char *tag, char *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
565 char *p;
566 unsigned int taglen = strlen(tag);
567 unsigned long size = modinfo_len;
568
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200569 if (info) {
570 size -= info - (char *)modinfo;
571 modinfo = next_string(info, &size);
572 }
573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 for (p = modinfo; p; p = next_string(p, &size)) {
575 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
576 return p + taglen + 1;
577 }
578 return NULL;
579}
580
Sam Ravnborgb817f6f2006-06-09 21:53:55 +0200581static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
582 const char *tag)
583
584{
585 return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
586}
587
Sam Ravnborg93684d32006-02-19 11:53:35 +0100588/**
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100589 * Test if string s ends in string sub
590 * return 0 if match
591 **/
592static int strrcmp(const char *s, const char *sub)
593{
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100594 int slen, sublen;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100595
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100596 if (!s || !sub)
597 return 1;
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100598
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100599 slen = strlen(s);
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100600 sublen = strlen(sub);
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100601
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100602 if ((slen == 0) || (sublen == 0))
603 return 1;
604
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100605 if (sublen > slen)
606 return 1;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100607
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100608 return memcmp(s + slen - sublen, sub, sublen);
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100609}
610
Sam Ravnborgff13f922008-01-23 19:54:27 +0100611static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
612{
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100613 if (sym)
614 return elf->strtab + sym->st_name;
615 else
616 return "";
Sam Ravnborgff13f922008-01-23 19:54:27 +0100617}
618
619static const char *sec_name(struct elf_info *elf, int shndx)
620{
621 Elf_Shdr *sechdrs = elf->sechdrs;
622 return (void *)elf->hdr +
623 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
624 sechdrs[shndx].sh_name;
625}
626
627static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
628{
629 return (void *)elf->hdr +
630 elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
631 sechdr->sh_name;
632}
633
Sam Ravnborg10668222008-01-13 22:21:31 +0100634/* if sym is empty or point to a string
635 * like ".[0-9]+" then return 1.
636 * This is the optional prefix added by ld to some sections
637 */
638static int number_prefix(const char *sym)
639{
640 if (*sym++ == '\0')
641 return 1;
642 if (*sym != '.')
643 return 0;
644 do {
645 char c = *sym++;
646 if (c < '0' || c > '9')
647 return 0;
648 } while (*sym);
649 return 1;
650}
651
652/* The pattern is an array of simple patterns.
653 * "foo" will match an exact string equal to "foo"
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100654 * "*foo" will match a string that ends with "foo"
Sam Ravnborg10668222008-01-13 22:21:31 +0100655 * "foo*" will match a string that begins with "foo"
656 * "foo$" will match a string equal to "foo" or "foo.1"
657 * where the '1' can be any number including several digits.
658 * The $ syntax is for sections where ld append a dot number
659 * to make section name unique.
660 */
661int match(const char *sym, const char * const pat[])
662{
663 const char *p;
664 while (*pat) {
665 p = *pat++;
666 const char *endp = p + strlen(p) - 1;
667
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100668 /* "*foo" */
669 if (*p == '*') {
670 if (strrcmp(sym, p + 1) == 0)
671 return 1;
672 }
Sam Ravnborg10668222008-01-13 22:21:31 +0100673 /* "foo*" */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100674 else if (*endp == '*') {
Sam Ravnborg10668222008-01-13 22:21:31 +0100675 if (strncmp(sym, p, strlen(p) - 1) == 0)
676 return 1;
677 }
678 /* "foo$" */
679 else if (*endp == '$') {
680 if (strncmp(sym, p, strlen(p) - 1) == 0) {
681 if (number_prefix(sym + strlen(p) - 1))
682 return 1;
683 }
684 }
685 /* no wildcards */
686 else {
687 if (strcmp(p, sym) == 0)
688 return 1;
689 }
690 }
691 /* no match */
692 return 0;
693}
694
Sam Ravnborg10668222008-01-13 22:21:31 +0100695/* sections that we do not want to do full section mismatch check on */
696static const char *section_white_list[] =
697 { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL };
698
Sam Ravnborge241a632008-01-28 20:13:13 +0100699/*
700 * Is this section one we do not want to check?
701 * This is often debug sections.
702 * If we are going to check this section then
703 * test if section name ends with a dot and a number.
704 * This is used to find sections where the linker have
705 * appended a dot-number to make the name unique.
706 * The cause of this is often a section specified in assembler
707 * without "ax" / "aw" and the same section used in .c
708 * code where gcc add these.
709 */
710static int check_section(const char *modname, const char *sec)
711{
712 const char *e = sec + strlen(sec) - 1;
713 if (match(sec, section_white_list))
714 return 1;
715
716 if (*e && isdigit(*e)) {
717 /* consume all digits */
718 while (*e && e != sec && isdigit(*e))
719 e--;
720 if (*e == '.') {
721 warn("%s (%s): unexpected section name.\n"
722 "The (.[number]+) following section name are "
723 "ld generated and not expected.\n"
724 "Did you forget to use \"ax\"/\"aw\" "
725 "in a .S file?\n"
726 "Note that for example <linux/init.h> contains\n"
727 "section definitions for use in .S files.\n\n",
728 modname, sec);
729 }
730 }
731 return 0;
732}
733
734
735
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100736#define ALL_INIT_DATA_SECTIONS \
737 ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$"
738#define ALL_EXIT_DATA_SECTIONS \
739 ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100740
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100741#define ALL_INIT_TEXT_SECTIONS \
742 ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$"
743#define ALL_EXIT_TEXT_SECTIONS \
744 ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100745
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100746#define ALL_INIT_SECTIONS ALL_INIT_DATA_SECTIONS, ALL_INIT_TEXT_SECTIONS
747#define ALL_EXIT_SECTIONS ALL_EXIT_DATA_SECTIONS, ALL_EXIT_TEXT_SECTIONS
Sam Ravnborg10668222008-01-13 22:21:31 +0100748
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100749#define DATA_SECTIONS ".data$", ".data.rel$"
Sam Ravnborg10668222008-01-13 22:21:31 +0100750#define TEXT_SECTIONS ".text$"
751
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100752#define INIT_SECTIONS ".init.data$", ".init.text$"
753#define DEV_INIT_SECTIONS ".devinit.data$", ".devinit.text$"
754#define CPU_INIT_SECTIONS ".cpuinit.data$", ".cpuinit.text$"
755#define MEM_INIT_SECTIONS ".meminit.data$", ".meminit.text$"
756
757#define EXIT_SECTIONS ".exit.data$", ".exit.text$"
758#define DEV_EXIT_SECTIONS ".devexit.data$", ".devexit.text$"
759#define CPU_EXIT_SECTIONS ".cpuexit.data$", ".cpuexit.text$"
760#define MEM_EXIT_SECTIONS ".memexit.data$", ".memexit.text$"
761
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100762/* init data sections */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100763static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100764
765/* all init sections */
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100766static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100767
768/* All init and exit sections (code + data) */
769static const char *init_exit_sections[] =
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100770 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100771
772/* data section */
773static const char *data_sections[] = { DATA_SECTIONS, NULL };
774
775/* sections that may refer to an init/exit section with no warning */
776static const char *initref_sections[] =
777{
778 ".text.init.refok*",
779 ".exit.text.refok*",
780 ".data.init.refok*",
781 NULL
782};
783
784
785/* symbols in .data that may refer to init/exit sections */
786static const char *symbol_white_list[] =
787{
788 "*driver",
789 "*_template", /* scsi uses *_template a lot */
790 "*_timer", /* arm uses ops structures named _timer a lot */
791 "*_sht", /* scsi also used *_sht to some extent */
792 "*_ops",
793 "*_probe",
794 "*_probe_one",
795 "*_console",
796 NULL
797};
798
799static const char *head_sections[] = { ".head.text*", NULL };
800static const char *linker_symbols[] =
801 { "__init_begin", "_sinittext", "_einittext", NULL };
802
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100803enum mismatch {
804 NO_MISMATCH,
805 TEXT_TO_INIT,
806 DATA_TO_INIT,
807 TEXT_TO_EXIT,
808 DATA_TO_EXIT,
809 XXXINIT_TO_INIT,
810 XXXEXIT_TO_EXIT,
811 INIT_TO_EXIT,
812 EXIT_TO_INIT,
813 EXPORT_TO_INIT_EXIT,
814};
815
Sam Ravnborg10668222008-01-13 22:21:31 +0100816struct sectioncheck {
817 const char *fromsec[20];
818 const char *tosec[20];
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100819 enum mismatch mismatch;
Sam Ravnborg10668222008-01-13 22:21:31 +0100820};
821
822const struct sectioncheck sectioncheck[] = {
823/* Do not reference init/exit code/data from
824 * normal code and data
825 */
826{
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100827 .fromsec = { TEXT_SECTIONS, NULL },
828 .tosec = { ALL_INIT_SECTIONS, NULL },
829 .mismatch = TEXT_TO_INIT,
830},
831{
832 .fromsec = { DATA_SECTIONS, NULL },
833 .tosec = { ALL_INIT_SECTIONS, NULL },
834 .mismatch = DATA_TO_INIT,
835},
836{
837 .fromsec = { TEXT_SECTIONS, NULL },
838 .tosec = { ALL_EXIT_SECTIONS, NULL },
839 .mismatch = TEXT_TO_EXIT,
840},
841{
842 .fromsec = { DATA_SECTIONS, NULL },
843 .tosec = { ALL_EXIT_SECTIONS, NULL },
844 .mismatch = DATA_TO_EXIT,
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100845},
846/* Do not reference init code/data from devinit/cpuinit/meminit code/data */
847{
848 .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100849 .tosec = { INIT_SECTIONS, NULL },
850 .mismatch = XXXINIT_TO_INIT,
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100851},
852/* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
853{
854 .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100855 .tosec = { EXIT_SECTIONS, NULL },
856 .mismatch = XXXEXIT_TO_EXIT,
Sam Ravnborg10668222008-01-13 22:21:31 +0100857},
858/* Do not use exit code/data from init code */
859{
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100860 .fromsec = { ALL_INIT_SECTIONS, NULL },
861 .tosec = { ALL_EXIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100862 .mismatch = INIT_TO_EXIT,
Sam Ravnborg10668222008-01-13 22:21:31 +0100863},
864/* Do not use init code/data from exit code */
865{
Sam Ravnborgeb8f6892008-01-20 20:07:28 +0100866 .fromsec = { ALL_EXIT_SECTIONS, NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100867 .tosec = { ALL_INIT_SECTIONS, NULL },
868 .mismatch = EXIT_TO_INIT,
Sam Ravnborg10668222008-01-13 22:21:31 +0100869},
870/* Do not export init/exit functions or data */
871{
872 .fromsec = { "__ksymtab*", NULL },
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100873 .tosec = { ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL },
874 .mismatch = EXPORT_TO_INIT_EXIT
Sam Ravnborg10668222008-01-13 22:21:31 +0100875}
876};
877
878static int section_mismatch(const char *fromsec, const char *tosec)
879{
880 int i;
881 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
882 const struct sectioncheck *check = &sectioncheck[0];
883
884 for (i = 0; i < elems; i++) {
885 if (match(fromsec, check->fromsec) &&
886 match(tosec, check->tosec))
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100887 return check->mismatch;
Sam Ravnborg10668222008-01-13 22:21:31 +0100888 check++;
889 }
Sam Ravnborg588ccd72008-01-24 21:12:37 +0100890 return NO_MISMATCH;
Sam Ravnborg10668222008-01-13 22:21:31 +0100891}
892
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100893/**
894 * Whitelist to allow certain references to pass with no warning.
Sam Ravnborg0e0d3142007-05-17 20:14:48 +0200895 *
896 * Pattern 0:
897 * Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
898 * The pattern is identified by:
Sam Ravnborgcb7e51d2007-07-25 22:24:52 +0200899 * fromsec = .text.init.refok* | .data.init.refok*
Sam Ravnborg0e0d3142007-05-17 20:14:48 +0200900 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100901 * Pattern 1:
902 * If a module parameter is declared __initdata and permissions=0
903 * then this is legal despite the warning generated.
904 * We cannot see value of permissions here, so just ignore
905 * this pattern.
906 * The pattern is identified by:
907 * tosec = .init.data
Sam Ravnborg9209aed2006-03-05 00:16:26 +0100908 * fromsec = .data*
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100909 * atsym =__param*
Sam Ravnborg62070fa2006-03-03 16:46:04 +0100910 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100911 * Pattern 2:
Randy Dunlap72ee59b2006-04-15 11:17:12 -0700912 * Many drivers utilise a *driver container with references to
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100913 * add, remove, probe functions etc.
914 * These functions may often be marked __init and we do not want to
915 * warn here.
916 * the pattern is identified by:
Sam Ravnborg83cda2b2007-07-25 21:52:31 +0200917 * tosec = init or exit section
918 * fromsec = data section
Sam Ravnborgdf578e72008-01-11 19:17:15 +0100919 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
920 * *probe_one, *_console, *_timer
Vivek Goyalee6a8542007-01-11 01:52:44 +0100921 *
922 * Pattern 3:
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +0100923 * Whitelist all refereces from .text.head to .init.data
924 * Whitelist all refereces from .text.head to .init.text
925 *
Sam Ravnborg1d8af552007-06-03 00:41:22 +0200926 * Pattern 4:
Vivek Goyalee6a8542007-01-11 01:52:44 +0100927 * Some symbols belong to init section but still it is ok to reference
928 * these from non-init sections as these symbols don't have any memory
929 * allocated for them and symbol address and value are same. So even
930 * if init section is freed, its ok to reference those symbols.
931 * For ex. symbols marking the init section boundaries.
932 * This pattern is identified by
933 * refsymname = __init_begin, _sinittext, _einittext
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +0100934 *
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100935 **/
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100936static int secref_whitelist(const char *fromsec, const char *fromsym,
937 const char *tosec, const char *tosym)
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100938{
Sam Ravnborg0e0d3142007-05-17 20:14:48 +0200939 /* Check for pattern 0 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100940 if (match(fromsec, initref_sections))
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100941 return 0;
Sam Ravnborg0e0d3142007-05-17 20:14:48 +0200942
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100943 /* Check for pattern 1 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100944 if (match(tosec, init_data_sections) &&
945 match(fromsec, data_sections) &&
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100946 (strncmp(fromsym, "__param", strlen("__param")) == 0))
947 return 0;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100948
949 /* Check for pattern 2 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100950 if (match(tosec, init_exit_sections) &&
951 match(fromsec, data_sections) &&
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100952 match(fromsym, symbol_white_list))
953 return 0;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100954
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +0100955 /* Check for pattern 3 */
Sam Ravnborg6c5bd232008-01-20 10:43:27 +0100956 if (match(fromsec, head_sections) &&
957 match(tosec, init_sections))
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100958 return 0;
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +0100959
Sam Ravnborg1d8af552007-06-03 00:41:22 +0200960 /* Check for pattern 4 */
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100961 if (match(tosym, linker_symbols))
962 return 0;
Sam Ravnborg9bf8cb92007-02-26 17:49:06 +0100963
Sam Ravnborg58fb0d42008-01-23 21:13:50 +0100964 return 1;
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +0100965}
966
967/**
Sam Ravnborg93684d32006-02-19 11:53:35 +0100968 * Find symbol based on relocation record info.
969 * In some cases the symbol supplied is a valid symbol so
970 * return refsym. If st_name != 0 we assume this is a valid symbol.
971 * In other cases the symbol needs to be looked up in the symbol table
972 * based on section and address.
973 * **/
Sam Ravnborg9ad21c32008-01-18 21:04:34 +0100974static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
Sam Ravnborg93684d32006-02-19 11:53:35 +0100975 Elf_Sym *relsym)
976{
977 Elf_Sym *sym;
Sam Ravnborg9ad21c32008-01-18 21:04:34 +0100978 Elf_Sym *near = NULL;
979 Elf64_Sword distance = 20;
980 Elf64_Sword d;
Sam Ravnborg93684d32006-02-19 11:53:35 +0100981
982 if (relsym->st_name != 0)
983 return relsym;
984 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
985 if (sym->st_shndx != relsym->st_shndx)
986 continue;
Atsushi Nemotoae4ac122007-05-22 18:27:39 +0900987 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
988 continue;
Sam Ravnborg93684d32006-02-19 11:53:35 +0100989 if (sym->st_value == addr)
990 return sym;
Sam Ravnborg9ad21c32008-01-18 21:04:34 +0100991 /* Find a symbol nearby - addr are maybe negative */
992 d = sym->st_value - addr;
993 if (d < 0)
994 d = addr - sym->st_value;
995 if (d < distance) {
996 distance = d;
997 near = sym;
998 }
Sam Ravnborg93684d32006-02-19 11:53:35 +0100999 }
Sam Ravnborg9ad21c32008-01-18 21:04:34 +01001000 /* We need a close match */
1001 if (distance < 20)
1002 return near;
1003 else
1004 return NULL;
Sam Ravnborg93684d32006-02-19 11:53:35 +01001005}
1006
David Brownellda68d612007-02-20 13:58:16 -08001007static inline int is_arm_mapping_symbol(const char *str)
1008{
1009 return str[0] == '$' && strchr("atd", str[1])
1010 && (str[2] == '\0' || str[2] == '.');
1011}
1012
1013/*
1014 * If there's no name there, ignore it; likewise, ignore it if it's
1015 * one of the magic symbols emitted used by current ARM tools.
1016 *
1017 * Otherwise if find_symbols_between() returns those symbols, they'll
1018 * fail the whitelist tests and cause lots of false alarms ... fixable
1019 * only by merging __exit and __init sections into __text, bloating
1020 * the kernel (which is especially evil on embedded platforms).
1021 */
1022static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1023{
1024 const char *name = elf->strtab + sym->st_name;
1025
1026 if (!name || !strlen(name))
1027 return 0;
1028 return !is_arm_mapping_symbol(name);
1029}
1030
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001031/*
Sam Ravnborg43c74d12006-03-05 12:02:46 +01001032 * Find symbols before or equal addr and after addr - in the section sec.
1033 * If we find two symbols with equal offset prefer one with a valid name.
1034 * The ELF format may have a better way to detect what type of symbol
1035 * it is, but this works for now.
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001036 **/
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001037static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1038 const char *sec)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001039{
1040 Elf_Sym *sym;
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001041 Elf_Sym *near = NULL;
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001042 Elf_Addr distance = ~0;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001043
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001044 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1045 const char *symsec;
1046
1047 if (sym->st_shndx >= SHN_LORESERVE)
1048 continue;
Sam Ravnborgff13f922008-01-23 19:54:27 +01001049 symsec = sec_name(elf, sym->st_shndx);
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001050 if (strcmp(symsec, sec) != 0)
1051 continue;
David Brownellda68d612007-02-20 13:58:16 -08001052 if (!is_valid_name(elf, sym))
1053 continue;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001054 if (sym->st_value <= addr) {
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001055 if ((addr - sym->st_value) < distance) {
1056 distance = addr - sym->st_value;
1057 near = sym;
1058 } else if ((addr - sym->st_value) == distance) {
1059 near = sym;
Sam Ravnborg43c74d12006-03-05 12:02:46 +01001060 }
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001061 }
1062 }
Sam Ravnborg157c23c2008-01-22 21:44:32 +01001063 return near;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001064}
1065
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001066/*
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001067 * Convert a section name to the function/data attribute
1068 * .init.text => __init
1069 * .cpuinit.data => __cpudata
1070 * .memexitconst => __memconst
1071 * etc.
1072*/
1073static char *sec2annotation(const char *s)
1074{
1075 if (match(s, init_exit_sections)) {
1076 char *p = malloc(20);
1077 char *r = p;
1078
1079 *p++ = '_';
1080 *p++ = '_';
1081 if (*s == '.')
1082 s++;
1083 while (*s && *s != '.')
1084 *p++ = *s++;
1085 *p = '\0';
1086 if (*s == '.')
1087 s++;
1088 if (strstr(s, "rodata") != NULL)
1089 strcat(p, "const ");
1090 else if (strstr(s, "data") != NULL)
1091 strcat(p, "data ");
1092 else
1093 strcat(p, " ");
1094 return r; /* we leak her but we do not care */
1095 } else {
1096 return "";
1097 }
1098}
1099
1100static int is_function(Elf_Sym *sym)
1101{
1102 if (sym)
1103 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1104 else
1105 return 0;
1106}
1107
1108/*
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001109 * Print a warning about a section mismatch.
1110 * Try to find symbols near it so user can find it.
Sam Ravnborg4c8fbca2006-02-26 22:18:11 +01001111 * Check whitelist before warning - it may be a false positive.
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001112 */
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001113static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001114 const char *fromsec,
1115 unsigned long long fromaddr,
1116 const char *fromsym,
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001117 int from_is_func,
1118 const char *tosec, const char *tosym,
1119 int to_is_func)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001120{
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001121 const char *from, *from_p;
1122 const char *to, *to_p;
1123 from = from_is_func ? "function" : "variable";
1124 from_p = from_is_func ? "()" : "";
1125 to = to_is_func ? "function" : "variable";
1126 to_p = to_is_func ? "()" : "";
1127
1128 fprintf(stderr, "WARNING: %s(%s+0x%llx): Section mismatch in"
1129 " reference from the %s %s%s to the %s %s:%s%s\n",
1130 modname, fromsec, fromaddr, from, fromsym, from_p,
1131 to, tosec, tosym, to_p);
1132
1133 sec_mismatch_count++;
1134 if (!sec_mismatch_verbose)
1135 return;
1136
1137 switch (mismatch) {
1138 case TEXT_TO_INIT:
1139 fprintf(stderr,
1140 "The function %s %s() references\n"
1141 "the %s %s%s%s.\n"
1142 "This is often because %s lacks a %s\n"
1143 "annotation or the annotation of %s is wrong.\n",
1144 sec2annotation(fromsec), fromsym,
1145 to, sec2annotation(tosec), tosym, to_p,
1146 fromsym, sec2annotation(tosec), tosym);
1147 break;
1148 case DATA_TO_INIT: {
1149 const char **s = symbol_white_list;
1150 fprintf(stderr,
1151 "The variable %s references\n"
1152 "the %s %s%s%s\n"
1153 "If the reference is valid then annotate the\n"
1154 "variable with __init* (see linux/init.h) "
1155 "or name the variable:\n",
1156 fromsym, to, sec2annotation(tosec), tosym, to_p);
1157 while (*s)
1158 fprintf(stderr, "%s, ", *s++);
1159 fprintf(stderr, "\n");
1160 break;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001161 }
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001162 case TEXT_TO_EXIT:
1163 fprintf(stderr,
1164 "The function %s() references a %s in an exit section.\n"
1165 "Often the %s %s%s has valid usage outside the exit section\n"
1166 "and the fix is to remove the %sannotation of %s.\n",
1167 fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
1168 break;
1169 case DATA_TO_EXIT: {
1170 const char **s = symbol_white_list;
1171 fprintf(stderr,
1172 "The variable %s references\n"
1173 "the %s %s%s%s\n"
1174 "If the reference is valid then annotate the\n"
1175 "variable with __exit* (see linux/init.h) or "
1176 "name the variable:\n",
1177 fromsym, to, sec2annotation(tosec), tosym, to_p);
1178 while (*s)
1179 fprintf(stderr, "%s, ", *s++);
1180 fprintf(stderr, "\n");
1181 break;
1182 }
1183 case XXXINIT_TO_INIT:
1184 case XXXEXIT_TO_EXIT:
1185 fprintf(stderr,
1186 "The %s %s%s%s references\n"
1187 "a %s %s%s%s.\n"
1188 "If %s is only used by %s then\n"
1189 "annotate %s with a matching annotation.\n",
1190 from, sec2annotation(fromsec), fromsym, from_p,
1191 to, sec2annotation(tosec), tosym, to_p,
1192 fromsym, tosym, fromsym);
1193 break;
1194 case INIT_TO_EXIT:
1195 fprintf(stderr,
1196 "The %s %s%s%s references\n"
1197 "a %s %s%s%s.\n"
1198 "This is often seen when error handling "
1199 "in the init function\n"
1200 "uses functionality in the exit path.\n"
1201 "The fix is often to remove the %sannotation of\n"
1202 "%s%s so it may be used outside an exit section.\n",
1203 from, sec2annotation(fromsec), fromsym, from_p,
1204 to, sec2annotation(tosec), tosym, to_p,
1205 sec2annotation(tosec), tosym, to_p);
1206 break;
1207 case EXIT_TO_INIT:
1208 fprintf(stderr,
1209 "The %s %s%s%s references\n"
1210 "a %s %s%s%s.\n"
1211 "This is often seen when error handling "
1212 "in the exit function\n"
1213 "uses functionality in the init path.\n"
1214 "The fix is often to remove the %sannotation of\n"
1215 "%s%s so it may be used outside an init section.\n",
1216 from, sec2annotation(fromsec), fromsym, from_p,
1217 to, sec2annotation(tosec), tosym, to_p,
1218 sec2annotation(tosec), tosym, to_p);
1219 break;
1220 case EXPORT_TO_INIT_EXIT:
1221 fprintf(stderr,
1222 "The symbol %s is exported and annotated %s\n"
1223 "Fix this by removing the %sannotation of %s "
1224 "or drop the export.\n",
1225 tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
1226 case NO_MISMATCH:
1227 /* To get warnings on missing members */
1228 break;
1229 }
1230 fprintf(stderr, "\n");
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001231}
1232
1233static void check_section_mismatch(const char *modname, struct elf_info *elf,
1234 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1235{
1236 const char *tosec;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001237 enum mismatch mismatch;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001238
1239 tosec = sec_name(elf, sym->st_shndx);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001240 mismatch = section_mismatch(fromsec, tosec);
1241 if (mismatch != NO_MISMATCH) {
1242 Elf_Sym *to;
1243 Elf_Sym *from;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001244 const char *tosym;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001245 const char *fromsym;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001246
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001247 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1248 fromsym = sym_name(elf, from);
1249 to = find_elf_symbol(elf, r->r_addend, sym);
1250 tosym = sym_name(elf, to);
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001251
1252 /* check whitelist - we may ignore it */
1253 if (secref_whitelist(fromsec, fromsym, tosec, tosym)) {
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001254 report_sec_mismatch(modname, mismatch,
1255 fromsec, r->r_offset, fromsym,
1256 is_function(from), tosec, tosym,
1257 is_function(to));
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001258 }
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001259 }
1260}
1261
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001262static unsigned int *reloc_location(struct elf_info *elf,
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001263 Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001264{
1265 Elf_Shdr *sechdrs = elf->sechdrs;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001266 int section = sechdr->sh_info;
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001267
1268 return (void *)elf->hdr + sechdrs[section].sh_offset +
1269 (r->r_offset - sechdrs[section].sh_addr);
1270}
1271
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001272static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001273{
1274 unsigned int r_typ = ELF_R_TYPE(r->r_info);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001275 unsigned int *location = reloc_location(elf, sechdr, r);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001276
1277 switch (r_typ) {
1278 case R_386_32:
1279 r->r_addend = TO_NATIVE(*location);
1280 break;
1281 case R_386_PC32:
1282 r->r_addend = TO_NATIVE(*location) + 4;
1283 /* For CONFIG_RELOCATABLE=y */
1284 if (elf->hdr->e_type == ET_EXEC)
1285 r->r_addend += r->r_offset;
1286 break;
1287 }
1288 return 0;
1289}
1290
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001291static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001292{
1293 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1294
1295 switch (r_typ) {
1296 case R_ARM_ABS32:
1297 /* From ARM ABI: (S + A) | T */
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001298 r->r_addend = (int)(long)
1299 (elf->symtab_start + ELF_R_SYM(r->r_info));
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001300 break;
1301 case R_ARM_PC24:
1302 /* From ARM ABI: ((S + A) | T) - P */
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001303 r->r_addend = (int)(long)(elf->hdr +
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001304 sechdr->sh_offset +
1305 (r->r_offset - sechdr->sh_addr));
Sam Ravnborg56a974f2007-07-16 22:39:35 +02001306 break;
1307 default:
1308 return 1;
1309 }
1310 return 0;
1311}
1312
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001313static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001314{
1315 unsigned int r_typ = ELF_R_TYPE(r->r_info);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001316 unsigned int *location = reloc_location(elf, sechdr, r);
Atsushi Nemotoae4ac122007-05-22 18:27:39 +09001317 unsigned int inst;
1318
1319 if (r_typ == R_MIPS_HI16)
1320 return 1; /* skip this */
1321 inst = TO_NATIVE(*location);
1322 switch (r_typ) {
1323 case R_MIPS_LO16:
1324 r->r_addend = inst & 0xffff;
1325 break;
1326 case R_MIPS_26:
1327 r->r_addend = (inst & 0x03ffffff) << 2;
1328 break;
1329 case R_MIPS_32:
1330 r->r_addend = inst;
1331 break;
1332 }
1333 return 0;
1334}
1335
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001336static void section_rela(const char *modname, struct elf_info *elf,
Sam Ravnborg10668222008-01-13 22:21:31 +01001337 Elf_Shdr *sechdr)
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001338{
1339 Elf_Sym *sym;
1340 Elf_Rela *rela;
1341 Elf_Rela r;
1342 unsigned int r_sym;
1343 const char *fromsec;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001344
Sam Ravnborgff13f922008-01-23 19:54:27 +01001345 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001346 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1347
Sam Ravnborgff13f922008-01-23 19:54:27 +01001348 fromsec = sech_name(elf, sechdr);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001349 fromsec += strlen(".rela");
1350 /* if from section (name) is know good then skip it */
Sam Ravnborge241a632008-01-28 20:13:13 +01001351 if (check_section(modname, fromsec))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001352 return;
Sam Ravnborge241a632008-01-28 20:13:13 +01001353
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001354 for (rela = start; rela < stop; rela++) {
1355 r.r_offset = TO_NATIVE(rela->r_offset);
1356#if KERNEL_ELFCLASS == ELFCLASS64
Sam Ravnborgff13f922008-01-23 19:54:27 +01001357 if (elf->hdr->e_machine == EM_MIPS) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001358 unsigned int r_typ;
1359 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1360 r_sym = TO_NATIVE(r_sym);
1361 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1362 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1363 } else {
1364 r.r_info = TO_NATIVE(rela->r_info);
1365 r_sym = ELF_R_SYM(r.r_info);
1366 }
1367#else
1368 r.r_info = TO_NATIVE(rela->r_info);
1369 r_sym = ELF_R_SYM(r.r_info);
1370#endif
1371 r.r_addend = TO_NATIVE(rela->r_addend);
1372 sym = elf->symtab_start + r_sym;
1373 /* Skip special sections */
1374 if (sym->st_shndx >= SHN_LORESERVE)
1375 continue;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001376 check_section_mismatch(modname, elf, &r, sym, fromsec);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001377 }
1378}
1379
1380static void section_rel(const char *modname, struct elf_info *elf,
Sam Ravnborg10668222008-01-13 22:21:31 +01001381 Elf_Shdr *sechdr)
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001382{
1383 Elf_Sym *sym;
1384 Elf_Rel *rel;
1385 Elf_Rela r;
1386 unsigned int r_sym;
1387 const char *fromsec;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001388
Sam Ravnborgff13f922008-01-23 19:54:27 +01001389 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001390 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1391
Sam Ravnborgff13f922008-01-23 19:54:27 +01001392 fromsec = sech_name(elf, sechdr);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001393 fromsec += strlen(".rel");
1394 /* if from section (name) is know good then skip it */
Sam Ravnborge241a632008-01-28 20:13:13 +01001395 if (check_section(modname, fromsec))
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001396 return;
1397
1398 for (rel = start; rel < stop; rel++) {
1399 r.r_offset = TO_NATIVE(rel->r_offset);
1400#if KERNEL_ELFCLASS == ELFCLASS64
Sam Ravnborgff13f922008-01-23 19:54:27 +01001401 if (elf->hdr->e_machine == EM_MIPS) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001402 unsigned int r_typ;
1403 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1404 r_sym = TO_NATIVE(r_sym);
1405 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1406 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1407 } else {
1408 r.r_info = TO_NATIVE(rel->r_info);
1409 r_sym = ELF_R_SYM(r.r_info);
1410 }
1411#else
1412 r.r_info = TO_NATIVE(rel->r_info);
1413 r_sym = ELF_R_SYM(r.r_info);
1414#endif
1415 r.r_addend = 0;
Sam Ravnborgff13f922008-01-23 19:54:27 +01001416 switch (elf->hdr->e_machine) {
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001417 case EM_386:
1418 if (addend_386_rel(elf, sechdr, &r))
1419 continue;
1420 break;
1421 case EM_ARM:
1422 if (addend_arm_rel(elf, sechdr, &r))
1423 continue;
1424 break;
1425 case EM_MIPS:
1426 if (addend_mips_rel(elf, sechdr, &r))
1427 continue;
1428 break;
1429 }
1430 sym = elf->symtab_start + r_sym;
1431 /* Skip special sections */
1432 if (sym->st_shndx >= SHN_LORESERVE)
1433 continue;
Sam Ravnborg58fb0d42008-01-23 21:13:50 +01001434 check_section_mismatch(modname, elf, &r, sym, fromsec);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001435 }
1436}
1437
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001438/**
1439 * A module includes a number of sections that are discarded
1440 * either when loaded or when used as built-in.
1441 * For loaded modules all functions marked __init and all data
1442 * marked __initdata will be discarded when the module has been intialized.
1443 * Likewise for modules used built-in the sections marked __exit
1444 * are discarded because __exit marked function are supposed to be called
1445 * only when a moduel is unloaded which never happes for built-in modules.
1446 * The check_sec_ref() function traverses all relocation records
1447 * to find all references to a section that reference a section that will
1448 * be discarded and warns about it.
1449 **/
1450static void check_sec_ref(struct module *mod, const char *modname,
Sam Ravnborg10668222008-01-13 22:21:31 +01001451 struct elf_info *elf)
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001452{
1453 int i;
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001454 Elf_Shdr *sechdrs = elf->sechdrs;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001455
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001456 /* Walk through all sections */
Sam Ravnborgff13f922008-01-23 19:54:27 +01001457 for (i = 0; i < elf->hdr->e_shnum; i++) {
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001458 /* We want to process only relocation sections and not .init */
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001459 if (sechdrs[i].sh_type == SHT_RELA)
Sam Ravnborg10668222008-01-13 22:21:31 +01001460 section_rela(modname, elf, &elf->sechdrs[i]);
Sam Ravnborg5b24c072008-01-18 21:49:29 +01001461 else if (sechdrs[i].sh_type == SHT_REL)
Sam Ravnborg10668222008-01-13 22:21:31 +01001462 section_rel(modname, elf, &elf->sechdrs[i]);
Sam Ravnborgb39927c2006-02-17 22:42:02 +01001463 }
1464}
1465
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001466static void read_symbols(char *modname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467{
1468 const char *symname;
1469 char *version;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001470 char *license;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 struct module *mod;
1472 struct elf_info info = { };
1473 Elf_Sym *sym;
1474
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +01001475 if (!parse_elf(&info, modname))
1476 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
1478 mod = new_module(modname);
1479
1480 /* When there's no vmlinux, don't print warnings about
1481 * unresolved symbols (since there'll be too many ;) */
1482 if (is_vmlinux(modname)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 have_vmlinux = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484 mod->skip = 1;
1485 }
1486
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001487 license = get_modinfo(info.modinfo, info.modinfo_len, "license");
1488 while (license) {
1489 if (license_is_gpl_compatible(license))
1490 mod->gpl_compatible = 1;
1491 else {
1492 mod->gpl_compatible = 0;
1493 break;
1494 }
1495 license = get_next_modinfo(info.modinfo, info.modinfo_len,
1496 "license", license);
1497 }
1498
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
1500 symname = info.strtab + sym->st_name;
1501
1502 handle_modversions(mod, &info, sym, symname);
1503 handle_moddevtable(mod, &info, sym, symname);
1504 }
Sam Ravnborgd1f25e62008-01-17 21:17:42 +01001505 if (!is_vmlinux(modname) ||
Sam Ravnborg10668222008-01-13 22:21:31 +01001506 (is_vmlinux(modname) && vmlinux_section_warnings))
1507 check_sec_ref(mod, modname, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
1509 version = get_modinfo(info.modinfo, info.modinfo_len, "version");
1510 if (version)
1511 maybe_frob_rcs_version(modname, version, info.modinfo,
1512 version - (char *)info.hdr);
1513 if (version || (all_versions && !is_vmlinux(modname)))
1514 get_src_version(modname, mod->srcversion,
1515 sizeof(mod->srcversion)-1);
1516
1517 parse_elf_finish(&info);
1518
1519 /* Our trick to get versioning for struct_module - it's
1520 * never passed as an argument to an exported function, so
1521 * the automatic versioning doesn't pick it up, but it's really
1522 * important anyhow */
1523 if (modversions)
1524 mod->unres = alloc_symbol("struct_module", 0, mod->unres);
1525}
1526
1527#define SZ 500
1528
1529/* We first write the generated file into memory using the
1530 * following helper, then compare to the file on disk and
1531 * only update the later if anything changed */
1532
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001533void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
1534 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535{
1536 char tmp[SZ];
1537 int len;
1538 va_list ap;
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 va_start(ap, fmt);
1541 len = vsnprintf(tmp, SZ, fmt, ap);
Sam Ravnborg7670f022006-03-16 23:04:08 -08001542 buf_write(buf, tmp, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 va_end(ap);
1544}
1545
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001546void buf_write(struct buffer *buf, const char *s, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547{
1548 if (buf->size - buf->pos < len) {
Sam Ravnborg7670f022006-03-16 23:04:08 -08001549 buf->size += len + SZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 buf->p = realloc(buf->p, buf->size);
1551 }
1552 strncpy(buf->p + buf->pos, s, len);
1553 buf->pos += len;
1554}
1555
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001556static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
1557{
1558 const char *e = is_vmlinux(m) ?"":".ko";
1559
1560 switch (exp) {
1561 case export_gpl:
1562 fatal("modpost: GPL-incompatible module %s%s "
1563 "uses GPL-only symbol '%s'\n", m, e, s);
1564 break;
1565 case export_unused_gpl:
1566 fatal("modpost: GPL-incompatible module %s%s "
1567 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
1568 break;
1569 case export_gpl_future:
1570 warn("modpost: GPL-incompatible module %s%s "
1571 "uses future GPL-only symbol '%s'\n", m, e, s);
1572 break;
1573 case export_plain:
1574 case export_unused:
1575 case export_unknown:
1576 /* ignore */
1577 break;
1578 }
1579}
1580
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001581static void check_for_unused(enum export exp, const char *m, const char *s)
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001582{
1583 const char *e = is_vmlinux(m) ?"":".ko";
1584
1585 switch (exp) {
1586 case export_unused:
1587 case export_unused_gpl:
1588 warn("modpost: module %s%s "
1589 "uses symbol '%s' marked UNUSED\n", m, e, s);
1590 break;
1591 default:
1592 /* ignore */
1593 break;
1594 }
1595}
1596
1597static void check_exports(struct module *mod)
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001598{
1599 struct symbol *s, *exp;
1600
1601 for (s = mod->unres; s; s = s->next) {
Andrew Morton6449bd62006-06-09 20:45:06 -07001602 const char *basename;
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001603 exp = find_symbol(s->name);
1604 if (!exp || exp->module == mod)
1605 continue;
Andrew Morton6449bd62006-06-09 20:45:06 -07001606 basename = strrchr(mod->name, '/');
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001607 if (basename)
1608 basename++;
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001609 else
1610 basename = mod->name;
1611 if (!mod->gpl_compatible)
1612 check_for_gpl_usage(exp->export, basename, exp->name);
1613 check_for_unused(exp->export, basename, exp->name);
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001614 }
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001615}
1616
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001617/**
1618 * Header for the generated file
1619 **/
1620static void add_header(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621{
1622 buf_printf(b, "#include <linux/module.h>\n");
1623 buf_printf(b, "#include <linux/vermagic.h>\n");
1624 buf_printf(b, "#include <linux/compiler.h>\n");
1625 buf_printf(b, "\n");
1626 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
1627 buf_printf(b, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 buf_printf(b, "struct module __this_module\n");
1629 buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
Ustyugov Romanf83b5e32005-09-23 08:42:11 +04001630 buf_printf(b, " .name = KBUILD_MODNAME,\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 if (mod->has_init)
1632 buf_printf(b, " .init = init_module,\n");
1633 if (mod->has_cleanup)
1634 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
1635 " .exit = cleanup_module,\n"
1636 "#endif\n");
Roman Zippele61a1c12007-05-09 02:35:15 -07001637 buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 buf_printf(b, "};\n");
1639}
1640
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001641/**
1642 * Record CRCs for unresolved symbols
1643 **/
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001644static int add_versions(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645{
1646 struct symbol *s, *exp;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001647 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648
1649 for (s = mod->unres; s; s = s->next) {
1650 exp = find_symbol(s->name);
1651 if (!exp || exp->module == mod) {
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001652 if (have_vmlinux && !s->weak) {
Matthew Wilcox2a116652006-10-07 05:35:32 -06001653 if (warn_unresolved) {
1654 warn("\"%s\" [%s.ko] undefined!\n",
1655 s->name, mod->name);
1656 } else {
1657 merror("\"%s\" [%s.ko] undefined!\n",
1658 s->name, mod->name);
1659 err = 1;
1660 }
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 continue;
1663 }
1664 s->module = exp->module;
1665 s->crc_valid = exp->crc_valid;
1666 s->crc = exp->crc;
1667 }
1668
1669 if (!modversions)
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001670 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671
1672 buf_printf(b, "\n");
1673 buf_printf(b, "static const struct modversion_info ____versions[]\n");
Adrian Bunk3ff6eec2008-01-24 22:16:20 +01001674 buf_printf(b, "__used\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
1676
1677 for (s = mod->unres; s; s = s->next) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001678 if (!s->module)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 if (!s->crc_valid) {
Sam Ravnborgcb805142006-01-28 16:57:26 +01001681 warn("\"%s\" [%s.ko] has no CRC!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 s->name, mod->name);
1683 continue;
1684 }
1685 buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
1686 }
1687
1688 buf_printf(b, "};\n");
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001689
1690 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691}
1692
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001693static void add_depends(struct buffer *b, struct module *mod,
1694 struct module *modules)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695{
1696 struct symbol *s;
1697 struct module *m;
1698 int first = 1;
1699
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001700 for (m = modules; m; m = m->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 m->seen = is_vmlinux(m->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702
1703 buf_printf(b, "\n");
1704 buf_printf(b, "static const char __module_depends[]\n");
Adrian Bunk3ff6eec2008-01-24 22:16:20 +01001705 buf_printf(b, "__used\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
1707 buf_printf(b, "\"depends=");
1708 for (s = mod->unres; s; s = s->next) {
Sam Ravnborga61b2df2007-02-26 19:46:52 +01001709 const char *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 if (!s->module)
1711 continue;
1712
1713 if (s->module->seen)
1714 continue;
1715
1716 s->module->seen = 1;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001717 p = strrchr(s->module->name, '/');
1718 if (p)
Sam Ravnborga61b2df2007-02-26 19:46:52 +01001719 p++;
1720 else
1721 p = s->module->name;
1722 buf_printf(b, "%s%s", first ? "" : ",", p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 first = 0;
1724 }
1725 buf_printf(b, "\";\n");
1726}
1727
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001728static void add_srcversion(struct buffer *b, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729{
1730 if (mod->srcversion[0]) {
1731 buf_printf(b, "\n");
1732 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
1733 mod->srcversion);
1734 }
1735}
1736
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001737static void write_if_changed(struct buffer *b, const char *fname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738{
1739 char *tmp;
1740 FILE *file;
1741 struct stat st;
1742
1743 file = fopen(fname, "r");
1744 if (!file)
1745 goto write;
1746
1747 if (fstat(fileno(file), &st) < 0)
1748 goto close_write;
1749
1750 if (st.st_size != b->pos)
1751 goto close_write;
1752
1753 tmp = NOFAIL(malloc(b->pos));
1754 if (fread(tmp, 1, b->pos, file) != b->pos)
1755 goto free_write;
1756
1757 if (memcmp(tmp, b->p, b->pos) != 0)
1758 goto free_write;
1759
1760 free(tmp);
1761 fclose(file);
1762 return;
1763
1764 free_write:
1765 free(tmp);
1766 close_write:
1767 fclose(file);
1768 write:
1769 file = fopen(fname, "w");
1770 if (!file) {
1771 perror(fname);
1772 exit(1);
1773 }
1774 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
1775 perror(fname);
1776 exit(1);
1777 }
1778 fclose(file);
1779}
1780
Ram Paibd5cbce2006-06-08 22:12:53 -07001781/* parse Module.symvers file. line format:
Sam Ravnborg534b89a2006-07-01 10:10:19 +02001782 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
Ram Paibd5cbce2006-06-08 22:12:53 -07001783 **/
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001784static void read_dump(const char *fname, unsigned int kernel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785{
1786 unsigned long size, pos = 0;
1787 void *file = grab_file(fname, &size);
1788 char *line;
1789
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001790 if (!file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 /* No symbol versions, silently ignore */
1792 return;
1793
1794 while ((line = get_next_line(&pos, file, size))) {
Sam Ravnborg534b89a2006-07-01 10:10:19 +02001795 char *symname, *modname, *d, *export, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 unsigned int crc;
1797 struct module *mod;
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001798 struct symbol *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
1800 if (!(symname = strchr(line, '\t')))
1801 goto fail;
1802 *symname++ = '\0';
1803 if (!(modname = strchr(symname, '\t')))
1804 goto fail;
1805 *modname++ = '\0';
Laurent Riffard9ac545b2006-06-11 08:02:06 +02001806 if ((export = strchr(modname, '\t')) != NULL)
Ram Paibd5cbce2006-06-08 22:12:53 -07001807 *export++ = '\0';
Sam Ravnborg534b89a2006-07-01 10:10:19 +02001808 if (export && ((end = strchr(export, '\t')) != NULL))
1809 *end = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 crc = strtoul(line, &d, 16);
1811 if (*symname == '\0' || *modname == '\0' || *d != '\0')
1812 goto fail;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001813 mod = find_module(modname);
1814 if (!mod) {
1815 if (is_vmlinux(modname))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 have_vmlinux = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 mod = new_module(NOFAIL(strdup(modname)));
1818 mod->skip = 1;
1819 }
Ram Paibd5cbce2006-06-08 22:12:53 -07001820 s = sym_add_exported(symname, mod, export_no(export));
Sam Ravnborg8e70c452006-01-28 22:22:33 +01001821 s->kernel = kernel;
1822 s->preloaded = 1;
Ram Paibd5cbce2006-06-08 22:12:53 -07001823 sym_update_crc(symname, mod, crc, export_no(export));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 }
1825 return;
1826fail:
1827 fatal("parse error in symbol dump file\n");
1828}
1829
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001830/* For normal builds always dump all symbols.
1831 * For external modules only dump symbols
1832 * that are not read from kernel Module.symvers.
1833 **/
1834static int dump_sym(struct symbol *sym)
1835{
1836 if (!external_module)
1837 return 1;
1838 if (sym->vmlinux || sym->kernel)
1839 return 0;
1840 return 1;
1841}
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001842
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001843static void write_dump(const char *fname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844{
1845 struct buffer buf = { };
1846 struct symbol *symbol;
1847 int n;
1848
1849 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
1850 symbol = symbolhash[n];
1851 while (symbol) {
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001852 if (dump_sym(symbol))
Ram Paibd5cbce2006-06-08 22:12:53 -07001853 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
Sam Ravnborg62070fa2006-03-03 16:46:04 +01001854 symbol->crc, symbol->name,
Ram Paibd5cbce2006-06-08 22:12:53 -07001855 symbol->module->name,
1856 export_str(symbol->export));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 symbol = symbol->next;
1858 }
1859 }
1860 write_if_changed(&buf, fname);
1861}
1862
Sam Ravnborg5c3ead82006-01-28 17:19:35 +01001863int main(int argc, char **argv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864{
1865 struct module *mod;
1866 struct buffer buf = { };
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001867 char *kernel_read = NULL, *module_read = NULL;
1868 char *dump_write = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 int opt;
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001870 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001872 while ((opt = getopt(argc, argv, "i:I:msSo:aw")) != -1) {
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001873 switch (opt) {
1874 case 'i':
1875 kernel_read = optarg;
1876 break;
1877 case 'I':
1878 module_read = optarg;
1879 external_module = 1;
1880 break;
1881 case 'm':
1882 modversions = 1;
1883 break;
1884 case 'o':
1885 dump_write = optarg;
1886 break;
1887 case 'a':
1888 all_versions = 1;
1889 break;
1890 case 's':
1891 vmlinux_section_warnings = 0;
1892 break;
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001893 case 'S':
1894 sec_mismatch_verbose = 0;
1895 break;
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001896 case 'w':
1897 warn_unresolved = 1;
1898 break;
1899 default:
1900 exit(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 }
1902 }
1903
Sam Ravnborg040fcc82006-01-28 22:15:55 +01001904 if (kernel_read)
1905 read_dump(kernel_read, 1);
1906 if (module_read)
1907 read_dump(module_read, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
Sam Ravnborgdf578e72008-01-11 19:17:15 +01001909 while (optind < argc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 read_symbols(argv[optind++]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 for (mod = modules; mod; mod = mod->next) {
1913 if (mod->skip)
1914 continue;
Sam Ravnborgc96fca22006-07-01 11:44:23 +02001915 check_exports(mod);
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001916 }
1917
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001918 err = 0;
1919
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001920 for (mod = modules; mod; mod = mod->next) {
Andi Kleen666ab412007-11-22 03:43:10 +01001921 char fname[strlen(mod->name) + 10];
1922
Sam Ravnborgb817f6f2006-06-09 21:53:55 +02001923 if (mod->skip)
1924 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925
1926 buf.pos = 0;
1927
1928 add_header(&buf, mod);
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001929 err |= add_versions(&buf, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 add_depends(&buf, mod, modules);
1931 add_moddevtable(&buf, mod);
1932 add_srcversion(&buf, mod);
1933
1934 sprintf(fname, "%s.mod.c", mod->name);
1935 write_if_changed(&buf, fname);
1936 }
1937
1938 if (dump_write)
1939 write_dump(dump_write);
Sam Ravnborg588ccd72008-01-24 21:12:37 +01001940 if (sec_mismatch_count && !sec_mismatch_verbose)
1941 fprintf(stderr, "modpost: Found %d section mismatch(es).\n"
1942 "To see additional details select \"Enable full "
1943 "Section mismatch analysis\"\n"
1944 "in the Kernel Hacking menu "
1945 "(CONFIG_SECTION_MISMATCH).\n", sec_mismatch_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946
Kirill Korotaevc53ddac2006-09-07 13:08:54 -07001947 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948}