Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Postprocess module symbol versions |
| 2 | * |
| 3 | * Copyright 2003 Kai Germaschewski |
| 4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 5 | * Copyright 2006-2008 Sam Ravnborg |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Based in part on module-init-tools/depmod.c,file2alias |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms |
| 9 | * of the GNU General Public License, incorporated herein by reference. |
| 10 | * |
| 11 | * Usage: modpost vmlinux module1.o module2.o ... |
| 12 | */ |
| 13 | |
Mathieu Desnoyers | b2e3e65 | 2008-02-13 15:03:39 -0800 | [diff] [blame] | 14 | #define _GNU_SOURCE |
| 15 | #include <stdio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <ctype.h> |
Andrew Morton | 5003bab | 2010-08-11 00:42:26 -0700 | [diff] [blame] | 17 | #include <string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "modpost.h" |
Linus Torvalds | 5a865c0 | 2009-12-17 07:23:42 -0800 | [diff] [blame] | 19 | #include "../../include/generated/autoconf.h" |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 20 | #include "../../include/linux/license.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Alan Jenkins | 9e1b9b8 | 2009-11-07 21:03:54 +0000 | [diff] [blame] | 22 | /* Some toolchains use a `_' prefix for all user symbols. */ |
| 23 | #ifdef CONFIG_SYMBOL_PREFIX |
| 24 | #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX |
| 25 | #else |
| 26 | #define MODULE_SYMBOL_PREFIX "" |
| 27 | #endif |
| 28 | |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | /* Are we using CONFIG_MODVERSIONS? */ |
| 31 | int modversions = 0; |
| 32 | /* Warn about undefined symbols? (do so if we have vmlinux) */ |
| 33 | int have_vmlinux = 0; |
| 34 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ |
| 35 | static int all_versions = 0; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 36 | /* If we are modposting external module set to 1 */ |
| 37 | static int external_module = 0; |
Sam Ravnborg | 8d8d828 | 2007-07-20 22:36:56 +0200 | [diff] [blame] | 38 | /* Warn about section mismatch in vmlinux if set to 1 */ |
| 39 | static int vmlinux_section_warnings = 1; |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 40 | /* Only warn about unresolved symbols */ |
| 41 | static int warn_unresolved = 0; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 42 | /* How a symbol is exported */ |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 43 | static int sec_mismatch_count = 0; |
| 44 | static int sec_mismatch_verbose = 1; |
| 45 | |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 46 | enum export { |
| 47 | export_plain, export_unused, export_gpl, |
| 48 | export_unused_gpl, export_gpl_future, export_unknown |
| 49 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Andi Kleen | 6d9a89e | 2007-11-22 03:43:08 +0100 | [diff] [blame] | 51 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
| 52 | |
| 53 | PRINTF void fatal(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
| 55 | va_list arglist; |
| 56 | |
| 57 | fprintf(stderr, "FATAL: "); |
| 58 | |
| 59 | va_start(arglist, fmt); |
| 60 | vfprintf(stderr, fmt, arglist); |
| 61 | va_end(arglist); |
| 62 | |
| 63 | exit(1); |
| 64 | } |
| 65 | |
Andi Kleen | 6d9a89e | 2007-11-22 03:43:08 +0100 | [diff] [blame] | 66 | PRINTF void warn(const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
| 68 | va_list arglist; |
| 69 | |
| 70 | fprintf(stderr, "WARNING: "); |
| 71 | |
| 72 | va_start(arglist, fmt); |
| 73 | vfprintf(stderr, fmt, arglist); |
| 74 | va_end(arglist); |
| 75 | } |
| 76 | |
Andi Kleen | 6d9a89e | 2007-11-22 03:43:08 +0100 | [diff] [blame] | 77 | PRINTF void merror(const char *fmt, ...) |
Matthew Wilcox | 2a11665 | 2006-10-07 05:35:32 -0600 | [diff] [blame] | 78 | { |
| 79 | va_list arglist; |
| 80 | |
| 81 | fprintf(stderr, "ERROR: "); |
| 82 | |
| 83 | va_start(arglist, fmt); |
| 84 | vfprintf(stderr, fmt, arglist); |
| 85 | va_end(arglist); |
| 86 | } |
| 87 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 88 | static int is_vmlinux(const char *modname) |
| 89 | { |
| 90 | const char *myname; |
| 91 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 92 | myname = strrchr(modname, '/'); |
| 93 | if (myname) |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 94 | myname++; |
| 95 | else |
| 96 | myname = modname; |
| 97 | |
Sam Ravnborg | 741f98f | 2007-07-17 10:54:06 +0200 | [diff] [blame] | 98 | return (strcmp(myname, "vmlinux") == 0) || |
| 99 | (strcmp(myname, "vmlinux.o") == 0); |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 100 | } |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | void *do_nofail(void *ptr, const char *expr) |
| 103 | { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 104 | if (!ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return ptr; |
| 108 | } |
| 109 | |
| 110 | /* A list of all modules we processed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | static struct module *modules; |
| 112 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 113 | static struct module *find_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | struct module *mod; |
| 116 | |
| 117 | for (mod = modules; mod; mod = mod->next) |
| 118 | if (strcmp(mod->name, modname) == 0) |
| 119 | break; |
| 120 | return mod; |
| 121 | } |
| 122 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 123 | static struct module *new_module(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
| 125 | struct module *mod; |
| 126 | char *p, *s; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | mod = NOFAIL(malloc(sizeof(*mod))); |
| 129 | memset(mod, 0, sizeof(*mod)); |
| 130 | p = NOFAIL(strdup(modname)); |
| 131 | |
| 132 | /* strip trailing .o */ |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 133 | s = strrchr(p, '.'); |
| 134 | if (s != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | if (strcmp(s, ".o") == 0) |
| 136 | *s = '\0'; |
| 137 | |
| 138 | /* add to list */ |
| 139 | mod->name = p; |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 140 | mod->gpl_compatible = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | mod->next = modules; |
| 142 | modules = mod; |
| 143 | |
| 144 | return mod; |
| 145 | } |
| 146 | |
| 147 | /* A hash of all exported symbols, |
| 148 | * struct symbol is also used for lists of unresolved symbols */ |
| 149 | |
| 150 | #define SYMBOL_HASH_SIZE 1024 |
| 151 | |
| 152 | struct symbol { |
| 153 | struct symbol *next; |
| 154 | struct module *module; |
| 155 | unsigned int crc; |
| 156 | int crc_valid; |
| 157 | unsigned int weak:1; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 158 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
| 159 | unsigned int kernel:1; /* 1 if symbol is from kernel |
| 160 | * (only for external modules) **/ |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 161 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 162 | enum export export; /* Type of export */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | char name[0]; |
| 164 | }; |
| 165 | |
| 166 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; |
| 167 | |
| 168 | /* This is based on the hash agorithm from gdbm, via tdb */ |
| 169 | static inline unsigned int tdb_hash(const char *name) |
| 170 | { |
| 171 | unsigned value; /* Used to compute the hash value. */ |
| 172 | unsigned i; /* Used to cycle through random values. */ |
| 173 | |
| 174 | /* Set the initial value from the key size. */ |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 175 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
| 177 | |
| 178 | return (1103515243 * value + 12345); |
| 179 | } |
| 180 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 181 | /** |
| 182 | * Allocate a new symbols for use in the hash of exported symbols or |
| 183 | * the list of unresolved symbols per module |
| 184 | **/ |
| 185 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, |
| 186 | struct symbol *next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
| 188 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); |
| 189 | |
| 190 | memset(s, 0, sizeof(*s)); |
| 191 | strcpy(s->name, name); |
| 192 | s->weak = weak; |
| 193 | s->next = next; |
| 194 | return s; |
| 195 | } |
| 196 | |
| 197 | /* For the hash of exported symbols */ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 198 | static struct symbol *new_symbol(const char *name, struct module *module, |
| 199 | enum export export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | { |
| 201 | unsigned int hash; |
| 202 | struct symbol *new; |
| 203 | |
| 204 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; |
| 205 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); |
| 206 | new->module = module; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 207 | new->export = export; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 208 | return new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 211 | static struct symbol *find_symbol(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
| 213 | struct symbol *s; |
| 214 | |
| 215 | /* For our purposes, .foo matches foo. PPC64 needs this. */ |
| 216 | if (name[0] == '.') |
| 217 | name++; |
| 218 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 219 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (strcmp(s->name, name) == 0) |
| 221 | return s; |
| 222 | } |
| 223 | return NULL; |
| 224 | } |
| 225 | |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 226 | static struct { |
| 227 | const char *str; |
| 228 | enum export export; |
| 229 | } export_list[] = { |
| 230 | { .str = "EXPORT_SYMBOL", .export = export_plain }, |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 231 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 232 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 233 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 234 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
| 235 | { .str = "(unknown)", .export = export_unknown }, |
| 236 | }; |
| 237 | |
| 238 | |
| 239 | static const char *export_str(enum export ex) |
| 240 | { |
| 241 | return export_list[ex].str; |
| 242 | } |
| 243 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 244 | static enum export export_no(const char *s) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 245 | { |
| 246 | int i; |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 247 | |
Sam Ravnborg | 534b89a | 2006-07-01 10:10:19 +0200 | [diff] [blame] | 248 | if (!s) |
| 249 | return export_unknown; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 250 | for (i = 0; export_list[i].export != export_unknown; i++) { |
| 251 | if (strcmp(export_list[i].str, s) == 0) |
| 252 | return export_list[i].export; |
| 253 | } |
| 254 | return export_unknown; |
| 255 | } |
| 256 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 257 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 258 | { |
| 259 | if (sec == elf->export_sec) |
| 260 | return export_plain; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 261 | else if (sec == elf->export_unused_sec) |
| 262 | return export_unused; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 263 | else if (sec == elf->export_gpl_sec) |
| 264 | return export_gpl; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 265 | else if (sec == elf->export_unused_gpl_sec) |
| 266 | return export_unused_gpl; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 267 | else if (sec == elf->export_gpl_future_sec) |
| 268 | return export_gpl_future; |
| 269 | else |
| 270 | return export_unknown; |
| 271 | } |
| 272 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 273 | /** |
| 274 | * Add an exported symbol - it may have already been added without a |
| 275 | * CRC, in this case just update the CRC |
| 276 | **/ |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 277 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
| 278 | enum export export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
| 280 | struct symbol *s = find_symbol(name); |
| 281 | |
| 282 | if (!s) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 283 | s = new_symbol(name, mod, export); |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 284 | } else { |
| 285 | if (!s->preloaded) { |
Sam Ravnborg | 7b75b13 | 2006-03-05 13:48:58 +0100 | [diff] [blame] | 286 | warn("%s: '%s' exported twice. Previous export " |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 287 | "was in %s%s\n", mod->name, name, |
| 288 | s->module->name, |
| 289 | is_vmlinux(s->module->name) ?"":".ko"); |
Trent Piepho | 4b21960 | 2007-10-11 16:40:10 -0700 | [diff] [blame] | 290 | } else { |
| 291 | /* In case Modules.symvers was out of date */ |
| 292 | s->module = mod; |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 295 | s->preloaded = 0; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 296 | s->vmlinux = is_vmlinux(mod->name); |
| 297 | s->kernel = 0; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 298 | s->export = export; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 299 | return s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 302 | static void sym_update_crc(const char *name, struct module *mod, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 303 | unsigned int crc, enum export export) |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 304 | { |
| 305 | struct symbol *s = find_symbol(name); |
| 306 | |
| 307 | if (!s) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 308 | s = new_symbol(name, mod, export); |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 309 | s->crc = crc; |
| 310 | s->crc_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 313 | void *grab_file(const char *filename, unsigned long *size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | { |
| 315 | struct stat st; |
| 316 | void *map; |
| 317 | int fd; |
| 318 | |
| 319 | fd = open(filename, O_RDONLY); |
| 320 | if (fd < 0 || fstat(fd, &st) != 0) |
| 321 | return NULL; |
| 322 | |
| 323 | *size = st.st_size; |
| 324 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
| 325 | close(fd); |
| 326 | |
| 327 | if (map == MAP_FAILED) |
| 328 | return NULL; |
| 329 | return map; |
| 330 | } |
| 331 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 332 | /** |
| 333 | * Return a copy of the next line in a mmap'ed file. |
| 334 | * spaces in the beginning of the line is trimmed away. |
| 335 | * Return a pointer to a static buffer. |
| 336 | **/ |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 337 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
| 339 | static char line[4096]; |
| 340 | int skip = 1; |
| 341 | size_t len = 0; |
| 342 | signed char *p = (signed char *)file + *pos; |
| 343 | char *s = line; |
| 344 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 345 | for (; *pos < size ; (*pos)++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (skip && isspace(*p)) { |
| 347 | p++; |
| 348 | continue; |
| 349 | } |
| 350 | skip = 0; |
| 351 | if (*p != '\n' && (*pos < size)) { |
| 352 | len++; |
| 353 | *s++ = *p++; |
| 354 | if (len > 4095) |
| 355 | break; /* Too long, stop */ |
| 356 | } else { |
| 357 | /* End of string */ |
| 358 | *s = '\0'; |
| 359 | return line; |
| 360 | } |
| 361 | } |
| 362 | /* End of buffer */ |
| 363 | return NULL; |
| 364 | } |
| 365 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 366 | void release_file(void *file, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
| 368 | munmap(file, size); |
| 369 | } |
| 370 | |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 371 | static int parse_elf(struct elf_info *info, const char *filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | { |
| 373 | unsigned int i; |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 374 | Elf_Ehdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | Elf_Shdr *sechdrs; |
| 376 | Elf_Sym *sym; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 377 | const char *secstrings; |
| 378 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | hdr = grab_file(filename, &info->size); |
| 381 | if (!hdr) { |
| 382 | perror(filename); |
Sam Ravnborg | 6803dc0 | 2006-06-24 23:46:54 +0200 | [diff] [blame] | 383 | exit(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | } |
| 385 | info->hdr = hdr; |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 386 | if (info->size < sizeof(*hdr)) { |
| 387 | /* file too small, assume this is an empty .o file */ |
| 388 | return 0; |
| 389 | } |
| 390 | /* Is this a valid ELF file? */ |
| 391 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || |
| 392 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || |
| 393 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || |
| 394 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { |
| 395 | /* Not an ELF file - silently ignore it */ |
| 396 | return 0; |
| 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | /* Fix endianness in ELF header */ |
Anders Kaseorg | 7d875a0 | 2009-05-03 22:02:55 +0200 | [diff] [blame] | 399 | hdr->e_type = TO_NATIVE(hdr->e_type); |
| 400 | hdr->e_machine = TO_NATIVE(hdr->e_machine); |
| 401 | hdr->e_version = TO_NATIVE(hdr->e_version); |
| 402 | hdr->e_entry = TO_NATIVE(hdr->e_entry); |
| 403 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); |
| 404 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); |
| 405 | hdr->e_flags = TO_NATIVE(hdr->e_flags); |
| 406 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); |
| 407 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); |
| 408 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); |
| 409 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); |
| 410 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); |
| 411 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 413 | info->sechdrs = sechdrs; |
| 414 | |
Petr Stetiar | a83710e | 2007-08-27 12:15:07 +0200 | [diff] [blame] | 415 | /* Check if file offset is correct */ |
| 416 | if (hdr->e_shoff > info->size) { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 417 | fatal("section header offset=%lu in file '%s' is bigger than " |
| 418 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, |
| 419 | filename, info->size); |
Petr Stetiar | a83710e | 2007-08-27 12:15:07 +0200 | [diff] [blame] | 420 | return 0; |
| 421 | } |
| 422 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 423 | if (hdr->e_shnum == 0) { |
| 424 | /* |
| 425 | * There are more than 64k sections, |
| 426 | * read count from .sh_size. |
| 427 | * note: it doesn't need shndx2secindex() |
| 428 | */ |
| 429 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); |
| 430 | } |
| 431 | else { |
| 432 | info->num_sections = hdr->e_shnum; |
| 433 | } |
| 434 | if (hdr->e_shstrndx == SHN_XINDEX) { |
| 435 | info->secindex_strings = |
| 436 | shndx2secindex(TO_NATIVE(sechdrs[0].sh_link)); |
| 437 | } |
| 438 | else { |
| 439 | info->secindex_strings = hdr->e_shstrndx; |
| 440 | } |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* Fix endianness in section headers */ |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 443 | for (i = 0; i < info->num_sections; i++) { |
Anders Kaseorg | 7d875a0 | 2009-05-03 22:02:55 +0200 | [diff] [blame] | 444 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
| 445 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); |
| 446 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); |
| 447 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); |
| 448 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); |
| 449 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); |
| 450 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); |
| 451 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); |
| 452 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); |
| 453 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | /* Find symbol table. */ |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 456 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
| 457 | for (i = 1; i < info->num_sections; i++) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 458 | const char *secname; |
Tejun Heo | 56fc82c | 2009-02-06 00:48:02 +0900 | [diff] [blame] | 459 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Tejun Heo | 56fc82c | 2009-02-06 00:48:02 +0900 | [diff] [blame] | 461 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 462 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
| 463 | "sizeof(*hrd)=%zu\n", filename, |
| 464 | (unsigned long)sechdrs[i].sh_offset, |
| 465 | sizeof(*hdr)); |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 466 | return 0; |
| 467 | } |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 468 | secname = secstrings + sechdrs[i].sh_name; |
| 469 | if (strcmp(secname, ".modinfo") == 0) { |
Tejun Heo | 56fc82c | 2009-02-06 00:48:02 +0900 | [diff] [blame] | 470 | if (nobits) |
| 471 | fatal("%s has NOBITS .modinfo\n", filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
| 473 | info->modinfo_len = sechdrs[i].sh_size; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 474 | } else if (strcmp(secname, "__ksymtab") == 0) |
| 475 | info->export_sec = i; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 476 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
| 477 | info->export_unused_sec = i; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 478 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
| 479 | info->export_gpl_sec = i; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 480 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
| 481 | info->export_unused_gpl_sec = i; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 482 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
| 483 | info->export_gpl_future_sec = i; |
| 484 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 485 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 486 | unsigned int sh_link_idx; |
| 487 | symtab_idx = i; |
| 488 | info->symtab_start = (void *)hdr + |
| 489 | sechdrs[i].sh_offset; |
| 490 | info->symtab_stop = (void *)hdr + |
| 491 | sechdrs[i].sh_offset + sechdrs[i].sh_size; |
| 492 | sh_link_idx = shndx2secindex(sechdrs[i].sh_link); |
| 493 | info->strtab = (void *)hdr + |
| 494 | sechdrs[sh_link_idx].sh_offset; |
| 495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 497 | /* 32bit section no. table? ("more than 64k sections") */ |
| 498 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { |
| 499 | symtab_shndx_idx = i; |
| 500 | info->symtab_shndx_start = (void *)hdr + |
| 501 | sechdrs[i].sh_offset; |
| 502 | info->symtab_shndx_stop = (void *)hdr + |
| 503 | sechdrs[i].sh_offset + sechdrs[i].sh_size; |
| 504 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 506 | if (!info->symtab_start) |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 507 | fatal("%s has no symtab?\n", filename); |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* Fix endianness in symbols */ |
| 510 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { |
| 511 | sym->st_shndx = TO_NATIVE(sym->st_shndx); |
| 512 | sym->st_name = TO_NATIVE(sym->st_name); |
| 513 | sym->st_value = TO_NATIVE(sym->st_value); |
| 514 | sym->st_size = TO_NATIVE(sym->st_size); |
| 515 | } |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 516 | |
| 517 | if (symtab_shndx_idx != ~0U) { |
| 518 | Elf32_Word *p; |
| 519 | if (symtab_idx != |
| 520 | shndx2secindex(sechdrs[symtab_shndx_idx].sh_link)) |
| 521 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
| 522 | filename, |
| 523 | shndx2secindex(sechdrs[symtab_shndx_idx].sh_link), |
| 524 | symtab_idx); |
| 525 | /* Fix endianness */ |
| 526 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; |
| 527 | p++) |
| 528 | *p = TO_NATIVE(*p); |
| 529 | } |
| 530 | |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 531 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
| 533 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 534 | static void parse_elf_finish(struct elf_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
| 536 | release_file(info->hdr, info->size); |
| 537 | } |
| 538 | |
Sam Ravnborg | 4d7365d | 2008-06-12 15:02:55 +0200 | [diff] [blame] | 539 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
| 540 | { |
| 541 | /* ignore __this_module, it will be resolved shortly */ |
| 542 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "__this_module") == 0) |
| 543 | return 1; |
| 544 | /* ignore global offset table */ |
| 545 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 546 | return 1; |
| 547 | if (info->hdr->e_machine == EM_PPC) |
| 548 | /* Special register function linked on all modules during final link of .ko */ |
| 549 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || |
| 550 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || |
| 551 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || |
| 552 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) |
| 553 | return 1; |
Stephen Rothwell | 7fca5dc | 2010-06-29 20:08:42 +0000 | [diff] [blame] | 554 | if (info->hdr->e_machine == EM_PPC64) |
| 555 | /* Special register function linked on all modules during final link of .ko */ |
| 556 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || |
| 557 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) |
| 558 | return 1; |
Sam Ravnborg | 4d7365d | 2008-06-12 15:02:55 +0200 | [diff] [blame] | 559 | /* Do not ignore this symbol */ |
| 560 | return 0; |
| 561 | } |
| 562 | |
Luke Yang | f7b05e6 | 2006-03-02 18:35:31 +0800 | [diff] [blame] | 563 | #define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_" |
| 564 | #define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 566 | static void handle_modversions(struct module *mod, struct elf_info *info, |
| 567 | Elf_Sym *sym, const char *symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
| 569 | unsigned int crc; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 570 | enum export export = export_from_sec(info, get_secindex(info, sym)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
| 572 | switch (sym->st_shndx) { |
| 573 | case SHN_COMMON: |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 574 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | break; |
| 576 | case SHN_ABS: |
| 577 | /* CRC'd symbol */ |
Michal Marek | 8d99513 | 2009-12-12 12:02:24 +0100 | [diff] [blame] | 578 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | crc = (unsigned int) sym->st_value; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 580 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
| 581 | export); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | break; |
| 584 | case SHN_UNDEF: |
| 585 | /* undefined symbol */ |
| 586 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && |
| 587 | ELF_ST_BIND(sym->st_info) != STB_WEAK) |
| 588 | break; |
Sam Ravnborg | 4d7365d | 2008-06-12 15:02:55 +0200 | [diff] [blame] | 589 | if (ignore_undef_symbol(info, symname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | break; |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 591 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
| 592 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) |
| 593 | /* add compatibility with older glibc */ |
| 594 | #ifndef STT_SPARC_REGISTER |
| 595 | #define STT_SPARC_REGISTER STT_REGISTER |
| 596 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (info->hdr->e_machine == EM_SPARC || |
| 598 | info->hdr->e_machine == EM_SPARCV9) { |
| 599 | /* Ignore register directives. */ |
Ben Colline | 8d52901 | 2005-08-19 13:44:57 -0700 | [diff] [blame] | 600 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | break; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 602 | if (symname[0] == '.') { |
| 603 | char *munged = strdup(symname); |
| 604 | munged[0] = '_'; |
| 605 | munged[1] = toupper(munged[1]); |
| 606 | symname = munged; |
| 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | #endif |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (memcmp(symname, MODULE_SYMBOL_PREFIX, |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 612 | strlen(MODULE_SYMBOL_PREFIX)) == 0) { |
| 613 | mod->unres = |
| 614 | alloc_symbol(symname + |
| 615 | strlen(MODULE_SYMBOL_PREFIX), |
| 616 | ELF_ST_BIND(sym->st_info) == STB_WEAK, |
| 617 | mod->unres); |
| 618 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | break; |
| 620 | default: |
| 621 | /* All exported symbols */ |
Michal Marek | 8d99513 | 2009-12-12 12:02:24 +0100 | [diff] [blame] | 622 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 623 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
| 624 | export); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0) |
| 627 | mod->has_init = 1; |
| 628 | if (strcmp(symname, MODULE_SYMBOL_PREFIX "cleanup_module") == 0) |
| 629 | mod->has_cleanup = 1; |
| 630 | break; |
| 631 | } |
| 632 | } |
| 633 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 634 | /** |
| 635 | * Parse tag=value strings from .modinfo section |
| 636 | **/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | static char *next_string(char *string, unsigned long *secsize) |
| 638 | { |
| 639 | /* Skip non-zero chars */ |
| 640 | while (string[0]) { |
| 641 | string++; |
| 642 | if ((*secsize)-- <= 1) |
| 643 | return NULL; |
| 644 | } |
| 645 | |
| 646 | /* Skip any zero padding. */ |
| 647 | while (!string[0]) { |
| 648 | string++; |
| 649 | if ((*secsize)-- <= 1) |
| 650 | return NULL; |
| 651 | } |
| 652 | return string; |
| 653 | } |
| 654 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 655 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
| 656 | const char *tag, char *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | { |
| 658 | char *p; |
| 659 | unsigned int taglen = strlen(tag); |
| 660 | unsigned long size = modinfo_len; |
| 661 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 662 | if (info) { |
| 663 | size -= info - (char *)modinfo; |
| 664 | modinfo = next_string(info, &size); |
| 665 | } |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | for (p = modinfo; p; p = next_string(p, &size)) { |
| 668 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 669 | return p + taglen + 1; |
| 670 | } |
| 671 | return NULL; |
| 672 | } |
| 673 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 674 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
| 675 | const char *tag) |
| 676 | |
| 677 | { |
| 678 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); |
| 679 | } |
| 680 | |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 681 | /** |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 682 | * Test if string s ends in string sub |
| 683 | * return 0 if match |
| 684 | **/ |
| 685 | static int strrcmp(const char *s, const char *sub) |
| 686 | { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 687 | int slen, sublen; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 688 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 689 | if (!s || !sub) |
| 690 | return 1; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 691 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 692 | slen = strlen(s); |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 693 | sublen = strlen(sub); |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 694 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 695 | if ((slen == 0) || (sublen == 0)) |
| 696 | return 1; |
| 697 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 698 | if (sublen > slen) |
| 699 | return 1; |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 700 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 701 | return memcmp(s + slen - sublen, sub, sublen); |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 702 | } |
| 703 | |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 704 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
| 705 | { |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 706 | if (sym) |
| 707 | return elf->strtab + sym->st_name; |
| 708 | else |
Sam Ravnborg | f666751 | 2008-02-06 21:51:18 +0100 | [diff] [blame] | 709 | return "(unknown)"; |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 710 | } |
| 711 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 712 | static const char *sec_name(struct elf_info *elf, int secindex) |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 713 | { |
| 714 | Elf_Shdr *sechdrs = elf->sechdrs; |
| 715 | return (void *)elf->hdr + |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 716 | elf->sechdrs[elf->secindex_strings].sh_offset + |
| 717 | sechdrs[secindex].sh_name; |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) |
| 721 | { |
| 722 | return (void *)elf->hdr + |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 723 | elf->sechdrs[elf->secindex_strings].sh_offset + |
| 724 | sechdr->sh_name; |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 725 | } |
| 726 | |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 727 | /* if sym is empty or point to a string |
| 728 | * like ".[0-9]+" then return 1. |
| 729 | * This is the optional prefix added by ld to some sections |
| 730 | */ |
| 731 | static int number_prefix(const char *sym) |
| 732 | { |
| 733 | if (*sym++ == '\0') |
| 734 | return 1; |
| 735 | if (*sym != '.') |
| 736 | return 0; |
| 737 | do { |
| 738 | char c = *sym++; |
| 739 | if (c < '0' || c > '9') |
| 740 | return 0; |
| 741 | } while (*sym); |
| 742 | return 1; |
| 743 | } |
| 744 | |
| 745 | /* The pattern is an array of simple patterns. |
| 746 | * "foo" will match an exact string equal to "foo" |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 747 | * "*foo" will match a string that ends with "foo" |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 748 | * "foo*" will match a string that begins with "foo" |
| 749 | * "foo$" will match a string equal to "foo" or "foo.1" |
| 750 | * where the '1' can be any number including several digits. |
| 751 | * The $ syntax is for sections where ld append a dot number |
| 752 | * to make section name unique. |
| 753 | */ |
Trevor Keith | 5c72513 | 2009-09-22 16:43:38 -0700 | [diff] [blame] | 754 | static int match(const char *sym, const char * const pat[]) |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 755 | { |
| 756 | const char *p; |
| 757 | while (*pat) { |
| 758 | p = *pat++; |
| 759 | const char *endp = p + strlen(p) - 1; |
| 760 | |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 761 | /* "*foo" */ |
| 762 | if (*p == '*') { |
| 763 | if (strrcmp(sym, p + 1) == 0) |
| 764 | return 1; |
| 765 | } |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 766 | /* "foo*" */ |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 767 | else if (*endp == '*') { |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 768 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
| 769 | return 1; |
| 770 | } |
| 771 | /* "foo$" */ |
| 772 | else if (*endp == '$') { |
| 773 | if (strncmp(sym, p, strlen(p) - 1) == 0) { |
| 774 | if (number_prefix(sym + strlen(p) - 1)) |
| 775 | return 1; |
| 776 | } |
| 777 | } |
| 778 | /* no wildcards */ |
| 779 | else { |
| 780 | if (strcmp(p, sym) == 0) |
| 781 | return 1; |
| 782 | } |
| 783 | } |
| 784 | /* no match */ |
| 785 | return 0; |
| 786 | } |
| 787 | |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 788 | /* sections that we do not want to do full section mismatch check on */ |
| 789 | static const char *section_white_list[] = |
Sam Ravnborg | 4391ed6 | 2009-05-04 13:05:26 +0200 | [diff] [blame] | 790 | { |
| 791 | ".comment*", |
| 792 | ".debug*", |
| 793 | ".mdebug*", /* alpha, score, mips etc. */ |
| 794 | ".pdr", /* alpha, score, mips etc. */ |
| 795 | ".stab*", |
| 796 | ".note*", |
| 797 | ".got*", |
| 798 | ".toc*", |
| 799 | NULL |
| 800 | }; |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 801 | |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 802 | /* |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 803 | * This is used to find sections missing the SHF_ALLOC flag. |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 804 | * The cause of this is often a section specified in assembler |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 805 | * without "ax" / "aw". |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 806 | */ |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 807 | static void check_section(const char *modname, struct elf_info *elf, |
| 808 | Elf_Shdr *sechdr) |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 809 | { |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 810 | const char *sec = sech_name(elf, sechdr); |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 811 | |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 812 | if (sechdr->sh_type == SHT_PROGBITS && |
| 813 | !(sechdr->sh_flags & SHF_ALLOC) && |
| 814 | !match(sec, section_white_list)) { |
| 815 | warn("%s (%s): unexpected non-allocatable section.\n" |
| 816 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" |
| 817 | "Note that for example <linux/init.h> contains\n" |
| 818 | "section definitions for use in .S files.\n\n", |
| 819 | modname, sec); |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 820 | } |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 821 | } |
| 822 | |
| 823 | |
| 824 | |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 825 | #define ALL_INIT_DATA_SECTIONS \ |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 826 | ".init.setup$", ".init.rodata$", \ |
| 827 | ".devinit.rodata$", ".cpuinit.rodata$", ".meminit.rodata$" \ |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 828 | ".init.data$", ".devinit.data$", ".cpuinit.data$", ".meminit.data$" |
| 829 | #define ALL_EXIT_DATA_SECTIONS \ |
| 830 | ".exit.data$", ".devexit.data$", ".cpuexit.data$", ".memexit.data$" |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 831 | |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 832 | #define ALL_INIT_TEXT_SECTIONS \ |
| 833 | ".init.text$", ".devinit.text$", ".cpuinit.text$", ".meminit.text$" |
| 834 | #define ALL_EXIT_TEXT_SECTIONS \ |
| 835 | ".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$" |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 836 | |
Uwe Kleine-König | 4a31a22 | 2010-01-29 12:04:26 +0100 | [diff] [blame] | 837 | #define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \ |
| 838 | MEM_INIT_SECTIONS |
| 839 | #define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \ |
| 840 | MEM_EXIT_SECTIONS |
| 841 | |
| 842 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS |
| 843 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 844 | |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 845 | #define DATA_SECTIONS ".data$", ".data.rel$" |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 846 | #define TEXT_SECTIONS ".text$" |
| 847 | |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 848 | #define INIT_SECTIONS ".init.*" |
| 849 | #define DEV_INIT_SECTIONS ".devinit.*" |
| 850 | #define CPU_INIT_SECTIONS ".cpuinit.*" |
| 851 | #define MEM_INIT_SECTIONS ".meminit.*" |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 852 | |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 853 | #define EXIT_SECTIONS ".exit.*" |
| 854 | #define DEV_EXIT_SECTIONS ".devexit.*" |
| 855 | #define CPU_EXIT_SECTIONS ".cpuexit.*" |
| 856 | #define MEM_EXIT_SECTIONS ".memexit.*" |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 857 | |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 858 | /* init data sections */ |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 859 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 860 | |
| 861 | /* all init sections */ |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 862 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 863 | |
| 864 | /* All init and exit sections (code + data) */ |
| 865 | static const char *init_exit_sections[] = |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 866 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 867 | |
| 868 | /* data section */ |
| 869 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; |
| 870 | |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 871 | |
| 872 | /* symbols in .data that may refer to init/exit sections */ |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 873 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
| 874 | "*driver", \ |
| 875 | "*_template", /* scsi uses *_template a lot */ \ |
| 876 | "*_timer", /* arm uses ops structures named _timer a lot */ \ |
| 877 | "*_sht", /* scsi also used *_sht to some extent */ \ |
| 878 | "*_ops", \ |
| 879 | "*_probe", \ |
| 880 | "*_probe_one", \ |
| 881 | "*_console" |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 882 | |
| 883 | static const char *head_sections[] = { ".head.text*", NULL }; |
| 884 | static const char *linker_symbols[] = |
| 885 | { "__init_begin", "_sinittext", "_einittext", NULL }; |
| 886 | |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 887 | enum mismatch { |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 888 | TEXT_TO_ANY_INIT, |
| 889 | DATA_TO_ANY_INIT, |
| 890 | TEXT_TO_ANY_EXIT, |
| 891 | DATA_TO_ANY_EXIT, |
| 892 | XXXINIT_TO_SOME_INIT, |
| 893 | XXXEXIT_TO_SOME_EXIT, |
| 894 | ANY_INIT_TO_ANY_EXIT, |
| 895 | ANY_EXIT_TO_ANY_INIT, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 896 | EXPORT_TO_INIT_EXIT, |
| 897 | }; |
| 898 | |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 899 | struct sectioncheck { |
| 900 | const char *fromsec[20]; |
| 901 | const char *tosec[20]; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 902 | enum mismatch mismatch; |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 903 | const char *symbol_white_list[20]; |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 904 | }; |
| 905 | |
| 906 | const struct sectioncheck sectioncheck[] = { |
| 907 | /* Do not reference init/exit code/data from |
| 908 | * normal code and data |
| 909 | */ |
| 910 | { |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 911 | .fromsec = { TEXT_SECTIONS, NULL }, |
| 912 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 913 | .mismatch = TEXT_TO_ANY_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 914 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 915 | }, |
| 916 | { |
| 917 | .fromsec = { DATA_SECTIONS, NULL }, |
Uwe Kleine-König | 0db25245 | 2010-01-30 21:14:23 +0100 | [diff] [blame] | 918 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 919 | .mismatch = DATA_TO_ANY_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 920 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 921 | }, |
| 922 | { |
Uwe Kleine-König | 0db25245 | 2010-01-30 21:14:23 +0100 | [diff] [blame] | 923 | .fromsec = { DATA_SECTIONS, NULL }, |
| 924 | .tosec = { INIT_SECTIONS, NULL }, |
| 925 | .mismatch = DATA_TO_ANY_INIT, |
| 926 | .symbol_white_list = { |
| 927 | "*_template", "*_timer", "*_sht", "*_ops", |
| 928 | "*_probe", "*_probe_one", "*_console", NULL |
| 929 | }, |
| 930 | }, |
| 931 | { |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 932 | .fromsec = { TEXT_SECTIONS, NULL }, |
| 933 | .tosec = { ALL_EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 934 | .mismatch = TEXT_TO_ANY_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 935 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 936 | }, |
| 937 | { |
| 938 | .fromsec = { DATA_SECTIONS, NULL }, |
| 939 | .tosec = { ALL_EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 940 | .mismatch = DATA_TO_ANY_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 941 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 942 | }, |
| 943 | /* Do not reference init code/data from devinit/cpuinit/meminit code/data */ |
| 944 | { |
Uwe Kleine-König | 4a31a22 | 2010-01-29 12:04:26 +0100 | [diff] [blame] | 945 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 946 | .tosec = { INIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 947 | .mismatch = XXXINIT_TO_SOME_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 948 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 949 | }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 950 | /* Do not reference cpuinit code/data from meminit code/data */ |
| 951 | { |
| 952 | .fromsec = { MEM_INIT_SECTIONS, NULL }, |
| 953 | .tosec = { CPU_INIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 954 | .mismatch = XXXINIT_TO_SOME_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 955 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 956 | }, |
| 957 | /* Do not reference meminit code/data from cpuinit code/data */ |
| 958 | { |
| 959 | .fromsec = { CPU_INIT_SECTIONS, NULL }, |
| 960 | .tosec = { MEM_INIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 961 | .mismatch = XXXINIT_TO_SOME_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 962 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 963 | }, |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 964 | /* Do not reference exit code/data from devexit/cpuexit/memexit code/data */ |
| 965 | { |
Uwe Kleine-König | 4a31a22 | 2010-01-29 12:04:26 +0100 | [diff] [blame] | 966 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 967 | .tosec = { EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 968 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 969 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 970 | }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 971 | /* Do not reference cpuexit code/data from memexit code/data */ |
| 972 | { |
| 973 | .fromsec = { MEM_EXIT_SECTIONS, NULL }, |
| 974 | .tosec = { CPU_EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 975 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 976 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 977 | }, |
| 978 | /* Do not reference memexit code/data from cpuexit code/data */ |
| 979 | { |
| 980 | .fromsec = { CPU_EXIT_SECTIONS, NULL }, |
| 981 | .tosec = { MEM_EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 982 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 983 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 984 | }, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 985 | /* Do not use exit code/data from init code */ |
| 986 | { |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 987 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
| 988 | .tosec = { ALL_EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 989 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 990 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 991 | }, |
| 992 | /* Do not use init code/data from exit code */ |
| 993 | { |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 994 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 995 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 996 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 997 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 998 | }, |
| 999 | /* Do not export init/exit functions or data */ |
| 1000 | { |
| 1001 | .fromsec = { "__ksymtab*", NULL }, |
Sam Ravnborg | fa95eb1 | 2008-02-02 23:30:22 +0100 | [diff] [blame] | 1002 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1003 | .mismatch = EXPORT_TO_INIT_EXIT, |
| 1004 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1005 | } |
| 1006 | }; |
| 1007 | |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1008 | static const struct sectioncheck *section_mismatch( |
| 1009 | const char *fromsec, const char *tosec) |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1010 | { |
| 1011 | int i; |
| 1012 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); |
| 1013 | const struct sectioncheck *check = §ioncheck[0]; |
| 1014 | |
| 1015 | for (i = 0; i < elems; i++) { |
| 1016 | if (match(fromsec, check->fromsec) && |
| 1017 | match(tosec, check->tosec)) |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1018 | return check; |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1019 | check++; |
| 1020 | } |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1021 | return NULL; |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1022 | } |
| 1023 | |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1024 | /** |
| 1025 | * Whitelist to allow certain references to pass with no warning. |
Sam Ravnborg | 0e0d314 | 2007-05-17 20:14:48 +0200 | [diff] [blame] | 1026 | * |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1027 | * Pattern 1: |
| 1028 | * If a module parameter is declared __initdata and permissions=0 |
| 1029 | * then this is legal despite the warning generated. |
| 1030 | * We cannot see value of permissions here, so just ignore |
| 1031 | * this pattern. |
| 1032 | * The pattern is identified by: |
| 1033 | * tosec = .init.data |
Sam Ravnborg | 9209aed | 2006-03-05 00:16:26 +0100 | [diff] [blame] | 1034 | * fromsec = .data* |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1035 | * atsym =__param* |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1036 | * |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1037 | * Pattern 2: |
Randy Dunlap | 72ee59b | 2006-04-15 11:17:12 -0700 | [diff] [blame] | 1038 | * Many drivers utilise a *driver container with references to |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1039 | * add, remove, probe functions etc. |
Uwe Kleine-König | b75dcab | 2010-01-29 11:40:38 +0100 | [diff] [blame] | 1040 | * These functions may often be marked __devinit and we do not want to |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1041 | * warn here. |
| 1042 | * the pattern is identified by: |
Sam Ravnborg | 83cda2b | 2007-07-25 21:52:31 +0200 | [diff] [blame] | 1043 | * tosec = init or exit section |
| 1044 | * fromsec = data section |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1045 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
| 1046 | * *probe_one, *_console, *_timer |
Vivek Goyal | ee6a854 | 2007-01-11 01:52:44 +0100 | [diff] [blame] | 1047 | * |
| 1048 | * Pattern 3: |
Sam Ravnborg | c993971 | 2009-04-26 11:17:42 +0200 | [diff] [blame] | 1049 | * Whitelist all references from .head.text to any init section |
Sam Ravnborg | 9bf8cb9 | 2007-02-26 17:49:06 +0100 | [diff] [blame] | 1050 | * |
Sam Ravnborg | 1d8af55 | 2007-06-03 00:41:22 +0200 | [diff] [blame] | 1051 | * Pattern 4: |
Vivek Goyal | ee6a854 | 2007-01-11 01:52:44 +0100 | [diff] [blame] | 1052 | * Some symbols belong to init section but still it is ok to reference |
| 1053 | * these from non-init sections as these symbols don't have any memory |
| 1054 | * allocated for them and symbol address and value are same. So even |
| 1055 | * if init section is freed, its ok to reference those symbols. |
| 1056 | * For ex. symbols marking the init section boundaries. |
| 1057 | * This pattern is identified by |
| 1058 | * refsymname = __init_begin, _sinittext, _einittext |
Sam Ravnborg | 9bf8cb9 | 2007-02-26 17:49:06 +0100 | [diff] [blame] | 1059 | * |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1060 | **/ |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1061 | static int secref_whitelist(const struct sectioncheck *mismatch, |
| 1062 | const char *fromsec, const char *fromsym, |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1063 | const char *tosec, const char *tosym) |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1064 | { |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1065 | /* Check for pattern 1 */ |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 1066 | if (match(tosec, init_data_sections) && |
| 1067 | match(fromsec, data_sections) && |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1068 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
| 1069 | return 0; |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1070 | |
| 1071 | /* Check for pattern 2 */ |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 1072 | if (match(tosec, init_exit_sections) && |
| 1073 | match(fromsec, data_sections) && |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1074 | match(fromsym, mismatch->symbol_white_list)) |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1075 | return 0; |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1076 | |
Sam Ravnborg | 9bf8cb9 | 2007-02-26 17:49:06 +0100 | [diff] [blame] | 1077 | /* Check for pattern 3 */ |
Sam Ravnborg | 6c5bd23 | 2008-01-20 10:43:27 +0100 | [diff] [blame] | 1078 | if (match(fromsec, head_sections) && |
| 1079 | match(tosec, init_sections)) |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1080 | return 0; |
Sam Ravnborg | 9bf8cb9 | 2007-02-26 17:49:06 +0100 | [diff] [blame] | 1081 | |
Sam Ravnborg | 1d8af55 | 2007-06-03 00:41:22 +0200 | [diff] [blame] | 1082 | /* Check for pattern 4 */ |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1083 | if (match(tosym, linker_symbols)) |
| 1084 | return 0; |
Sam Ravnborg | 9bf8cb9 | 2007-02-26 17:49:06 +0100 | [diff] [blame] | 1085 | |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1086 | return 1; |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | /** |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1090 | * Find symbol based on relocation record info. |
| 1091 | * In some cases the symbol supplied is a valid symbol so |
| 1092 | * return refsym. If st_name != 0 we assume this is a valid symbol. |
| 1093 | * In other cases the symbol needs to be looked up in the symbol table |
| 1094 | * based on section and address. |
| 1095 | * **/ |
Sam Ravnborg | 9ad21c3 | 2008-01-18 21:04:34 +0100 | [diff] [blame] | 1096 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1097 | Elf_Sym *relsym) |
| 1098 | { |
| 1099 | Elf_Sym *sym; |
Sam Ravnborg | 9ad21c3 | 2008-01-18 21:04:34 +0100 | [diff] [blame] | 1100 | Elf_Sym *near = NULL; |
| 1101 | Elf64_Sword distance = 20; |
| 1102 | Elf64_Sword d; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1103 | unsigned int relsym_secindex; |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1104 | |
| 1105 | if (relsym->st_name != 0) |
| 1106 | return relsym; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1107 | |
| 1108 | relsym_secindex = get_secindex(elf, relsym); |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1109 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1110 | if (get_secindex(elf, sym) != relsym_secindex) |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1111 | continue; |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1112 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
| 1113 | continue; |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1114 | if (sym->st_value == addr) |
| 1115 | return sym; |
Sam Ravnborg | 9ad21c3 | 2008-01-18 21:04:34 +0100 | [diff] [blame] | 1116 | /* Find a symbol nearby - addr are maybe negative */ |
| 1117 | d = sym->st_value - addr; |
| 1118 | if (d < 0) |
| 1119 | d = addr - sym->st_value; |
| 1120 | if (d < distance) { |
| 1121 | distance = d; |
| 1122 | near = sym; |
| 1123 | } |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1124 | } |
Sam Ravnborg | 9ad21c3 | 2008-01-18 21:04:34 +0100 | [diff] [blame] | 1125 | /* We need a close match */ |
| 1126 | if (distance < 20) |
| 1127 | return near; |
| 1128 | else |
| 1129 | return NULL; |
Sam Ravnborg | 93684d3 | 2006-02-19 11:53:35 +0100 | [diff] [blame] | 1130 | } |
| 1131 | |
David Brownell | da68d61 | 2007-02-20 13:58:16 -0800 | [diff] [blame] | 1132 | static inline int is_arm_mapping_symbol(const char *str) |
| 1133 | { |
| 1134 | return str[0] == '$' && strchr("atd", str[1]) |
| 1135 | && (str[2] == '\0' || str[2] == '.'); |
| 1136 | } |
| 1137 | |
| 1138 | /* |
| 1139 | * If there's no name there, ignore it; likewise, ignore it if it's |
| 1140 | * one of the magic symbols emitted used by current ARM tools. |
| 1141 | * |
| 1142 | * Otherwise if find_symbols_between() returns those symbols, they'll |
| 1143 | * fail the whitelist tests and cause lots of false alarms ... fixable |
| 1144 | * only by merging __exit and __init sections into __text, bloating |
| 1145 | * the kernel (which is especially evil on embedded platforms). |
| 1146 | */ |
| 1147 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) |
| 1148 | { |
| 1149 | const char *name = elf->strtab + sym->st_name; |
| 1150 | |
| 1151 | if (!name || !strlen(name)) |
| 1152 | return 0; |
| 1153 | return !is_arm_mapping_symbol(name); |
| 1154 | } |
| 1155 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1156 | /* |
Sam Ravnborg | 43c74d1 | 2006-03-05 12:02:46 +0100 | [diff] [blame] | 1157 | * Find symbols before or equal addr and after addr - in the section sec. |
| 1158 | * If we find two symbols with equal offset prefer one with a valid name. |
| 1159 | * The ELF format may have a better way to detect what type of symbol |
| 1160 | * it is, but this works for now. |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1161 | **/ |
Sam Ravnborg | 157c23c | 2008-01-22 21:44:32 +0100 | [diff] [blame] | 1162 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
| 1163 | const char *sec) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1164 | { |
| 1165 | Elf_Sym *sym; |
Sam Ravnborg | 157c23c | 2008-01-22 21:44:32 +0100 | [diff] [blame] | 1166 | Elf_Sym *near = NULL; |
Sam Ravnborg | 157c23c | 2008-01-22 21:44:32 +0100 | [diff] [blame] | 1167 | Elf_Addr distance = ~0; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1168 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1169 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
| 1170 | const char *symsec; |
| 1171 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1172 | if (is_shndx_special(sym->st_shndx)) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1173 | continue; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1174 | symsec = sec_name(elf, get_secindex(elf, sym)); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1175 | if (strcmp(symsec, sec) != 0) |
| 1176 | continue; |
David Brownell | da68d61 | 2007-02-20 13:58:16 -0800 | [diff] [blame] | 1177 | if (!is_valid_name(elf, sym)) |
| 1178 | continue; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1179 | if (sym->st_value <= addr) { |
Sam Ravnborg | 157c23c | 2008-01-22 21:44:32 +0100 | [diff] [blame] | 1180 | if ((addr - sym->st_value) < distance) { |
| 1181 | distance = addr - sym->st_value; |
| 1182 | near = sym; |
| 1183 | } else if ((addr - sym->st_value) == distance) { |
| 1184 | near = sym; |
Sam Ravnborg | 43c74d1 | 2006-03-05 12:02:46 +0100 | [diff] [blame] | 1185 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1186 | } |
| 1187 | } |
Sam Ravnborg | 157c23c | 2008-01-22 21:44:32 +0100 | [diff] [blame] | 1188 | return near; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1189 | } |
| 1190 | |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1191 | /* |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1192 | * Convert a section name to the function/data attribute |
| 1193 | * .init.text => __init |
| 1194 | * .cpuinit.data => __cpudata |
| 1195 | * .memexitconst => __memconst |
| 1196 | * etc. |
| 1197 | */ |
| 1198 | static char *sec2annotation(const char *s) |
| 1199 | { |
| 1200 | if (match(s, init_exit_sections)) { |
| 1201 | char *p = malloc(20); |
| 1202 | char *r = p; |
| 1203 | |
| 1204 | *p++ = '_'; |
| 1205 | *p++ = '_'; |
| 1206 | if (*s == '.') |
| 1207 | s++; |
| 1208 | while (*s && *s != '.') |
| 1209 | *p++ = *s++; |
| 1210 | *p = '\0'; |
| 1211 | if (*s == '.') |
| 1212 | s++; |
| 1213 | if (strstr(s, "rodata") != NULL) |
| 1214 | strcat(p, "const "); |
| 1215 | else if (strstr(s, "data") != NULL) |
| 1216 | strcat(p, "data "); |
| 1217 | else |
| 1218 | strcat(p, " "); |
| 1219 | return r; /* we leak her but we do not care */ |
| 1220 | } else { |
Andrew Morton | 5003bab | 2010-08-11 00:42:26 -0700 | [diff] [blame] | 1221 | return strdup(""); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | static int is_function(Elf_Sym *sym) |
| 1226 | { |
| 1227 | if (sym) |
| 1228 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; |
| 1229 | else |
Sam Ravnborg | f666751 | 2008-02-06 21:51:18 +0100 | [diff] [blame] | 1230 | return -1; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | /* |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1234 | * Print a warning about a section mismatch. |
| 1235 | * Try to find symbols near it so user can find it. |
Sam Ravnborg | 4c8fbca | 2006-02-26 22:18:11 +0100 | [diff] [blame] | 1236 | * Check whitelist before warning - it may be a false positive. |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1237 | */ |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1238 | static void report_sec_mismatch(const char *modname, |
| 1239 | const struct sectioncheck *mismatch, |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1240 | const char *fromsec, |
| 1241 | unsigned long long fromaddr, |
| 1242 | const char *fromsym, |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1243 | int from_is_func, |
| 1244 | const char *tosec, const char *tosym, |
| 1245 | int to_is_func) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1246 | { |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1247 | const char *from, *from_p; |
| 1248 | const char *to, *to_p; |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1249 | char *prl_from; |
| 1250 | char *prl_to; |
Sam Ravnborg | f666751 | 2008-02-06 21:51:18 +0100 | [diff] [blame] | 1251 | |
| 1252 | switch (from_is_func) { |
| 1253 | case 0: from = "variable"; from_p = ""; break; |
| 1254 | case 1: from = "function"; from_p = "()"; break; |
| 1255 | default: from = "(unknown reference)"; from_p = ""; break; |
| 1256 | } |
| 1257 | switch (to_is_func) { |
| 1258 | case 0: to = "variable"; to_p = ""; break; |
| 1259 | case 1: to = "function"; to_p = "()"; break; |
| 1260 | default: to = "(unknown reference)"; to_p = ""; break; |
| 1261 | } |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1262 | |
Sam Ravnborg | e5f95c8 | 2008-02-02 18:57:18 +0100 | [diff] [blame] | 1263 | sec_mismatch_count++; |
| 1264 | if (!sec_mismatch_verbose) |
| 1265 | return; |
| 1266 | |
Geert Uytterhoeven | 7c0ac49 | 2008-02-05 11:38:49 +0100 | [diff] [blame] | 1267 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
| 1268 | "to the %s %s:%s%s\n", |
| 1269 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, |
| 1270 | tosym, to_p); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1271 | |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1272 | switch (mismatch->mismatch) { |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1273 | case TEXT_TO_ANY_INIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1274 | prl_from = sec2annotation(fromsec); |
| 1275 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1276 | fprintf(stderr, |
Sam Ravnborg | f666751 | 2008-02-06 21:51:18 +0100 | [diff] [blame] | 1277 | "The function %s%s() references\n" |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1278 | "the %s %s%s%s.\n" |
| 1279 | "This is often because %s lacks a %s\n" |
| 1280 | "annotation or the annotation of %s is wrong.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1281 | prl_from, fromsym, |
| 1282 | to, prl_to, tosym, to_p, |
| 1283 | fromsym, prl_to, tosym); |
| 1284 | free(prl_from); |
| 1285 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1286 | break; |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1287 | case DATA_TO_ANY_INIT: { |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1288 | prl_to = sec2annotation(tosec); |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1289 | const char *const *s = mismatch->symbol_white_list; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1290 | fprintf(stderr, |
| 1291 | "The variable %s references\n" |
| 1292 | "the %s %s%s%s\n" |
| 1293 | "If the reference is valid then annotate the\n" |
Sam Ravnborg | 8b8b76c | 2009-06-06 00:18:05 +0200 | [diff] [blame] | 1294 | "variable with __init* or __refdata (see linux/init.h) " |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1295 | "or name the variable:\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1296 | fromsym, to, prl_to, tosym, to_p); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1297 | while (*s) |
| 1298 | fprintf(stderr, "%s, ", *s++); |
| 1299 | fprintf(stderr, "\n"); |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1300 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1301 | break; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1302 | } |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1303 | case TEXT_TO_ANY_EXIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1304 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1305 | fprintf(stderr, |
| 1306 | "The function %s() references a %s in an exit section.\n" |
| 1307 | "Often the %s %s%s has valid usage outside the exit section\n" |
| 1308 | "and the fix is to remove the %sannotation of %s.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1309 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
| 1310 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1311 | break; |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1312 | case DATA_TO_ANY_EXIT: { |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1313 | prl_to = sec2annotation(tosec); |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1314 | const char *const *s = mismatch->symbol_white_list; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1315 | fprintf(stderr, |
| 1316 | "The variable %s references\n" |
| 1317 | "the %s %s%s%s\n" |
| 1318 | "If the reference is valid then annotate the\n" |
| 1319 | "variable with __exit* (see linux/init.h) or " |
| 1320 | "name the variable:\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1321 | fromsym, to, prl_to, tosym, to_p); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1322 | while (*s) |
| 1323 | fprintf(stderr, "%s, ", *s++); |
| 1324 | fprintf(stderr, "\n"); |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1325 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1326 | break; |
| 1327 | } |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1328 | case XXXINIT_TO_SOME_INIT: |
| 1329 | case XXXEXIT_TO_SOME_EXIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1330 | prl_from = sec2annotation(fromsec); |
| 1331 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1332 | fprintf(stderr, |
| 1333 | "The %s %s%s%s references\n" |
| 1334 | "a %s %s%s%s.\n" |
| 1335 | "If %s is only used by %s then\n" |
| 1336 | "annotate %s with a matching annotation.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1337 | from, prl_from, fromsym, from_p, |
| 1338 | to, prl_to, tosym, to_p, |
Geert Uytterhoeven | b1d2675 | 2008-02-17 14:12:10 +0100 | [diff] [blame] | 1339 | tosym, fromsym, tosym); |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1340 | free(prl_from); |
| 1341 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1342 | break; |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1343 | case ANY_INIT_TO_ANY_EXIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1344 | prl_from = sec2annotation(fromsec); |
| 1345 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1346 | fprintf(stderr, |
| 1347 | "The %s %s%s%s references\n" |
| 1348 | "a %s %s%s%s.\n" |
| 1349 | "This is often seen when error handling " |
| 1350 | "in the init function\n" |
| 1351 | "uses functionality in the exit path.\n" |
| 1352 | "The fix is often to remove the %sannotation of\n" |
| 1353 | "%s%s so it may be used outside an exit section.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1354 | from, prl_from, fromsym, from_p, |
| 1355 | to, prl_to, tosym, to_p, |
Andrew Morton | 5003bab | 2010-08-11 00:42:26 -0700 | [diff] [blame] | 1356 | prl_to, tosym, to_p); |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1357 | free(prl_from); |
| 1358 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1359 | break; |
Uwe Kleine-König | bbd3f4f | 2010-01-30 16:35:47 +0100 | [diff] [blame] | 1360 | case ANY_EXIT_TO_ANY_INIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1361 | prl_from = sec2annotation(fromsec); |
| 1362 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1363 | fprintf(stderr, |
| 1364 | "The %s %s%s%s references\n" |
| 1365 | "a %s %s%s%s.\n" |
| 1366 | "This is often seen when error handling " |
| 1367 | "in the exit function\n" |
| 1368 | "uses functionality in the init path.\n" |
| 1369 | "The fix is often to remove the %sannotation of\n" |
| 1370 | "%s%s so it may be used outside an init section.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1371 | from, prl_from, fromsym, from_p, |
| 1372 | to, prl_to, tosym, to_p, |
| 1373 | prl_to, tosym, to_p); |
| 1374 | free(prl_from); |
| 1375 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1376 | break; |
| 1377 | case EXPORT_TO_INIT_EXIT: |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1378 | prl_to = sec2annotation(tosec); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1379 | fprintf(stderr, |
| 1380 | "The symbol %s is exported and annotated %s\n" |
| 1381 | "Fix this by removing the %sannotation of %s " |
| 1382 | "or drop the export.\n", |
Alexey Fomenko | 37ed19d | 2010-08-09 17:20:24 -0700 | [diff] [blame] | 1383 | tosym, prl_to, prl_to, tosym); |
| 1384 | free(prl_to); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1385 | break; |
| 1386 | } |
| 1387 | fprintf(stderr, "\n"); |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1388 | } |
| 1389 | |
| 1390 | static void check_section_mismatch(const char *modname, struct elf_info *elf, |
| 1391 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) |
| 1392 | { |
| 1393 | const char *tosec; |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1394 | const struct sectioncheck *mismatch; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1395 | |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1396 | tosec = sec_name(elf, get_secindex(elf, sym)); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1397 | mismatch = section_mismatch(fromsec, tosec); |
Uwe Kleine-König | 0d2a636 | 2010-01-30 16:56:20 +0100 | [diff] [blame] | 1398 | if (mismatch) { |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1399 | Elf_Sym *to; |
| 1400 | Elf_Sym *from; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1401 | const char *tosym; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1402 | const char *fromsym; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1403 | |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1404 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
| 1405 | fromsym = sym_name(elf, from); |
| 1406 | to = find_elf_symbol(elf, r->r_addend, sym); |
| 1407 | tosym = sym_name(elf, to); |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1408 | |
| 1409 | /* check whitelist - we may ignore it */ |
Uwe Kleine-König | af92a82 | 2010-01-30 20:52:50 +0100 | [diff] [blame] | 1410 | if (secref_whitelist(mismatch, |
| 1411 | fromsec, fromsym, tosec, tosym)) { |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 1412 | report_sec_mismatch(modname, mismatch, |
| 1413 | fromsec, r->r_offset, fromsym, |
| 1414 | is_function(from), tosec, tosym, |
| 1415 | is_function(to)); |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1416 | } |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1417 | } |
| 1418 | } |
| 1419 | |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1420 | static unsigned int *reloc_location(struct elf_info *elf, |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1421 | Elf_Shdr *sechdr, Elf_Rela *r) |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1422 | { |
| 1423 | Elf_Shdr *sechdrs = elf->sechdrs; |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1424 | int section = shndx2secindex(sechdr->sh_info); |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1425 | |
| 1426 | return (void *)elf->hdr + sechdrs[section].sh_offset + |
Krzysztof Halasa | 1c93866 | 2010-06-11 01:08:20 +0200 | [diff] [blame] | 1427 | r->r_offset - sechdrs[section].sh_addr; |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1428 | } |
| 1429 | |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1430 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1431 | { |
| 1432 | unsigned int r_typ = ELF_R_TYPE(r->r_info); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1433 | unsigned int *location = reloc_location(elf, sechdr, r); |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1434 | |
| 1435 | switch (r_typ) { |
| 1436 | case R_386_32: |
| 1437 | r->r_addend = TO_NATIVE(*location); |
| 1438 | break; |
| 1439 | case R_386_PC32: |
| 1440 | r->r_addend = TO_NATIVE(*location) + 4; |
| 1441 | /* For CONFIG_RELOCATABLE=y */ |
| 1442 | if (elf->hdr->e_type == ET_EXEC) |
| 1443 | r->r_addend += r->r_offset; |
| 1444 | break; |
| 1445 | } |
| 1446 | return 0; |
| 1447 | } |
| 1448 | |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1449 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
Sam Ravnborg | 56a974f | 2007-07-16 22:39:35 +0200 | [diff] [blame] | 1450 | { |
| 1451 | unsigned int r_typ = ELF_R_TYPE(r->r_info); |
| 1452 | |
| 1453 | switch (r_typ) { |
| 1454 | case R_ARM_ABS32: |
| 1455 | /* From ARM ABI: (S + A) | T */ |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1456 | r->r_addend = (int)(long) |
| 1457 | (elf->symtab_start + ELF_R_SYM(r->r_info)); |
Sam Ravnborg | 56a974f | 2007-07-16 22:39:35 +0200 | [diff] [blame] | 1458 | break; |
| 1459 | case R_ARM_PC24: |
| 1460 | /* From ARM ABI: ((S + A) | T) - P */ |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1461 | r->r_addend = (int)(long)(elf->hdr + |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1462 | sechdr->sh_offset + |
| 1463 | (r->r_offset - sechdr->sh_addr)); |
Sam Ravnborg | 56a974f | 2007-07-16 22:39:35 +0200 | [diff] [blame] | 1464 | break; |
| 1465 | default: |
| 1466 | return 1; |
| 1467 | } |
| 1468 | return 0; |
| 1469 | } |
| 1470 | |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1471 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1472 | { |
| 1473 | unsigned int r_typ = ELF_R_TYPE(r->r_info); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1474 | unsigned int *location = reloc_location(elf, sechdr, r); |
Atsushi Nemoto | ae4ac12 | 2007-05-22 18:27:39 +0900 | [diff] [blame] | 1475 | unsigned int inst; |
| 1476 | |
| 1477 | if (r_typ == R_MIPS_HI16) |
| 1478 | return 1; /* skip this */ |
| 1479 | inst = TO_NATIVE(*location); |
| 1480 | switch (r_typ) { |
| 1481 | case R_MIPS_LO16: |
| 1482 | r->r_addend = inst & 0xffff; |
| 1483 | break; |
| 1484 | case R_MIPS_26: |
| 1485 | r->r_addend = (inst & 0x03ffffff) << 2; |
| 1486 | break; |
| 1487 | case R_MIPS_32: |
| 1488 | r->r_addend = inst; |
| 1489 | break; |
| 1490 | } |
| 1491 | return 0; |
| 1492 | } |
| 1493 | |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1494 | static void section_rela(const char *modname, struct elf_info *elf, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1495 | Elf_Shdr *sechdr) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1496 | { |
| 1497 | Elf_Sym *sym; |
| 1498 | Elf_Rela *rela; |
| 1499 | Elf_Rela r; |
| 1500 | unsigned int r_sym; |
| 1501 | const char *fromsec; |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1502 | |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1503 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1504 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
| 1505 | |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1506 | fromsec = sech_name(elf, sechdr); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1507 | fromsec += strlen(".rela"); |
| 1508 | /* if from section (name) is know good then skip it */ |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 1509 | if (match(fromsec, section_white_list)) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1510 | return; |
Sam Ravnborg | e241a63 | 2008-01-28 20:13:13 +0100 | [diff] [blame] | 1511 | |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1512 | for (rela = start; rela < stop; rela++) { |
| 1513 | r.r_offset = TO_NATIVE(rela->r_offset); |
| 1514 | #if KERNEL_ELFCLASS == ELFCLASS64 |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1515 | if (elf->hdr->e_machine == EM_MIPS) { |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1516 | unsigned int r_typ; |
| 1517 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); |
| 1518 | r_sym = TO_NATIVE(r_sym); |
| 1519 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); |
| 1520 | r.r_info = ELF64_R_INFO(r_sym, r_typ); |
| 1521 | } else { |
| 1522 | r.r_info = TO_NATIVE(rela->r_info); |
| 1523 | r_sym = ELF_R_SYM(r.r_info); |
| 1524 | } |
| 1525 | #else |
| 1526 | r.r_info = TO_NATIVE(rela->r_info); |
| 1527 | r_sym = ELF_R_SYM(r.r_info); |
| 1528 | #endif |
| 1529 | r.r_addend = TO_NATIVE(rela->r_addend); |
| 1530 | sym = elf->symtab_start + r_sym; |
| 1531 | /* Skip special sections */ |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1532 | if (is_shndx_special(sym->st_shndx)) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1533 | continue; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1534 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1535 | } |
| 1536 | } |
| 1537 | |
| 1538 | static void section_rel(const char *modname, struct elf_info *elf, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1539 | Elf_Shdr *sechdr) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1540 | { |
| 1541 | Elf_Sym *sym; |
| 1542 | Elf_Rel *rel; |
| 1543 | Elf_Rela r; |
| 1544 | unsigned int r_sym; |
| 1545 | const char *fromsec; |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1546 | |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1547 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1548 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
| 1549 | |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1550 | fromsec = sech_name(elf, sechdr); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1551 | fromsec += strlen(".rel"); |
| 1552 | /* if from section (name) is know good then skip it */ |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 1553 | if (match(fromsec, section_white_list)) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1554 | return; |
| 1555 | |
| 1556 | for (rel = start; rel < stop; rel++) { |
| 1557 | r.r_offset = TO_NATIVE(rel->r_offset); |
| 1558 | #if KERNEL_ELFCLASS == ELFCLASS64 |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1559 | if (elf->hdr->e_machine == EM_MIPS) { |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1560 | unsigned int r_typ; |
| 1561 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); |
| 1562 | r_sym = TO_NATIVE(r_sym); |
| 1563 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); |
| 1564 | r.r_info = ELF64_R_INFO(r_sym, r_typ); |
| 1565 | } else { |
| 1566 | r.r_info = TO_NATIVE(rel->r_info); |
| 1567 | r_sym = ELF_R_SYM(r.r_info); |
| 1568 | } |
| 1569 | #else |
| 1570 | r.r_info = TO_NATIVE(rel->r_info); |
| 1571 | r_sym = ELF_R_SYM(r.r_info); |
| 1572 | #endif |
| 1573 | r.r_addend = 0; |
Sam Ravnborg | ff13f92 | 2008-01-23 19:54:27 +0100 | [diff] [blame] | 1574 | switch (elf->hdr->e_machine) { |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1575 | case EM_386: |
| 1576 | if (addend_386_rel(elf, sechdr, &r)) |
| 1577 | continue; |
| 1578 | break; |
| 1579 | case EM_ARM: |
| 1580 | if (addend_arm_rel(elf, sechdr, &r)) |
| 1581 | continue; |
| 1582 | break; |
| 1583 | case EM_MIPS: |
| 1584 | if (addend_mips_rel(elf, sechdr, &r)) |
| 1585 | continue; |
| 1586 | break; |
| 1587 | } |
| 1588 | sym = elf->symtab_start + r_sym; |
| 1589 | /* Skip special sections */ |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1590 | if (is_shndx_special(sym->st_shndx)) |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1591 | continue; |
Sam Ravnborg | 58fb0d4 | 2008-01-23 21:13:50 +0100 | [diff] [blame] | 1592 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1593 | } |
| 1594 | } |
| 1595 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1596 | /** |
| 1597 | * A module includes a number of sections that are discarded |
| 1598 | * either when loaded or when used as built-in. |
| 1599 | * For loaded modules all functions marked __init and all data |
| 1600 | * marked __initdata will be discarded when the module has been intialized. |
| 1601 | * Likewise for modules used built-in the sections marked __exit |
| 1602 | * are discarded because __exit marked function are supposed to be called |
Ben Dooks | 32be1d2 | 2008-07-29 22:33:44 -0700 | [diff] [blame] | 1603 | * only when a module is unloaded which never happens for built-in modules. |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1604 | * The check_sec_ref() function traverses all relocation records |
| 1605 | * to find all references to a section that reference a section that will |
| 1606 | * be discarded and warns about it. |
| 1607 | **/ |
| 1608 | static void check_sec_ref(struct module *mod, const char *modname, |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1609 | struct elf_info *elf) |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1610 | { |
| 1611 | int i; |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1612 | Elf_Shdr *sechdrs = elf->sechdrs; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1613 | |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1614 | /* Walk through all sections */ |
Denys Vlasenko | 1ce53ad | 2010-07-29 01:47:53 +0200 | [diff] [blame] | 1615 | for (i = 0; i < elf->num_sections; i++) { |
Anders Kaseorg | b614a69 | 2009-04-23 16:49:33 -0400 | [diff] [blame] | 1616 | check_section(modname, elf, &elf->sechdrs[i]); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1617 | /* We want to process only relocation sections and not .init */ |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1618 | if (sechdrs[i].sh_type == SHT_RELA) |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1619 | section_rela(modname, elf, &elf->sechdrs[i]); |
Sam Ravnborg | 5b24c07 | 2008-01-18 21:49:29 +0100 | [diff] [blame] | 1620 | else if (sechdrs[i].sh_type == SHT_REL) |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1621 | section_rel(modname, elf, &elf->sechdrs[i]); |
Sam Ravnborg | b39927c | 2006-02-17 22:42:02 +0100 | [diff] [blame] | 1622 | } |
| 1623 | } |
| 1624 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1625 | static void read_symbols(char *modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | { |
| 1627 | const char *symname; |
| 1628 | char *version; |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1629 | char *license; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | struct module *mod; |
| 1631 | struct elf_info info = { }; |
| 1632 | Elf_Sym *sym; |
| 1633 | |
Sam Ravnborg | 85bd2fd | 2007-02-26 15:33:52 +0100 | [diff] [blame] | 1634 | if (!parse_elf(&info, modname)) |
| 1635 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | |
| 1637 | mod = new_module(modname); |
| 1638 | |
| 1639 | /* When there's no vmlinux, don't print warnings about |
| 1640 | * unresolved symbols (since there'll be too many ;) */ |
| 1641 | if (is_vmlinux(modname)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | have_vmlinux = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | mod->skip = 1; |
| 1644 | } |
| 1645 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1646 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
Sam Ravnborg | 2fa3656 | 2008-04-26 21:07:26 +0200 | [diff] [blame] | 1647 | if (info.modinfo && !license && !is_vmlinux(modname)) |
| 1648 | warn("modpost: missing MODULE_LICENSE() in %s\n" |
| 1649 | "see include/linux/module.h for " |
| 1650 | "more information\n", modname); |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1651 | while (license) { |
| 1652 | if (license_is_gpl_compatible(license)) |
| 1653 | mod->gpl_compatible = 1; |
| 1654 | else { |
| 1655 | mod->gpl_compatible = 0; |
| 1656 | break; |
| 1657 | } |
| 1658 | license = get_next_modinfo(info.modinfo, info.modinfo_len, |
| 1659 | "license", license); |
| 1660 | } |
| 1661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
| 1663 | symname = info.strtab + sym->st_name; |
| 1664 | |
| 1665 | handle_modversions(mod, &info, sym, symname); |
| 1666 | handle_moddevtable(mod, &info, sym, symname); |
| 1667 | } |
Sam Ravnborg | d1f25e6 | 2008-01-17 21:17:42 +0100 | [diff] [blame] | 1668 | if (!is_vmlinux(modname) || |
Sam Ravnborg | 1066822 | 2008-01-13 22:21:31 +0100 | [diff] [blame] | 1669 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
| 1670 | check_sec_ref(mod, modname, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
| 1672 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); |
| 1673 | if (version) |
| 1674 | maybe_frob_rcs_version(modname, version, info.modinfo, |
| 1675 | version - (char *)info.hdr); |
| 1676 | if (version || (all_versions && !is_vmlinux(modname))) |
| 1677 | get_src_version(modname, mod->srcversion, |
| 1678 | sizeof(mod->srcversion)-1); |
| 1679 | |
| 1680 | parse_elf_finish(&info); |
| 1681 | |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 1682 | /* Our trick to get versioning for module struct etc. - it's |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | * never passed as an argument to an exported function, so |
| 1684 | * the automatic versioning doesn't pick it up, but it's really |
| 1685 | * important anyhow */ |
| 1686 | if (modversions) |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 1687 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | } |
| 1689 | |
| 1690 | #define SZ 500 |
| 1691 | |
| 1692 | /* We first write the generated file into memory using the |
| 1693 | * following helper, then compare to the file on disk and |
| 1694 | * only update the later if anything changed */ |
| 1695 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1696 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
| 1697 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | { |
| 1699 | char tmp[SZ]; |
| 1700 | int len; |
| 1701 | va_list ap; |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 1702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | va_start(ap, fmt); |
| 1704 | len = vsnprintf(tmp, SZ, fmt, ap); |
Sam Ravnborg | 7670f02 | 2006-03-16 23:04:08 -0800 | [diff] [blame] | 1705 | buf_write(buf, tmp, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | va_end(ap); |
| 1707 | } |
| 1708 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1709 | void buf_write(struct buffer *buf, const char *s, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | { |
| 1711 | if (buf->size - buf->pos < len) { |
Sam Ravnborg | 7670f02 | 2006-03-16 23:04:08 -0800 | [diff] [blame] | 1712 | buf->size += len + SZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | buf->p = realloc(buf->p, buf->size); |
| 1714 | } |
| 1715 | strncpy(buf->p + buf->pos, s, len); |
| 1716 | buf->pos += len; |
| 1717 | } |
| 1718 | |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 1719 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
| 1720 | { |
| 1721 | const char *e = is_vmlinux(m) ?"":".ko"; |
| 1722 | |
| 1723 | switch (exp) { |
| 1724 | case export_gpl: |
| 1725 | fatal("modpost: GPL-incompatible module %s%s " |
| 1726 | "uses GPL-only symbol '%s'\n", m, e, s); |
| 1727 | break; |
| 1728 | case export_unused_gpl: |
| 1729 | fatal("modpost: GPL-incompatible module %s%s " |
| 1730 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); |
| 1731 | break; |
| 1732 | case export_gpl_future: |
| 1733 | warn("modpost: GPL-incompatible module %s%s " |
| 1734 | "uses future GPL-only symbol '%s'\n", m, e, s); |
| 1735 | break; |
| 1736 | case export_plain: |
| 1737 | case export_unused: |
| 1738 | case export_unknown: |
| 1739 | /* ignore */ |
| 1740 | break; |
| 1741 | } |
| 1742 | } |
| 1743 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1744 | static void check_for_unused(enum export exp, const char *m, const char *s) |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 1745 | { |
| 1746 | const char *e = is_vmlinux(m) ?"":".ko"; |
| 1747 | |
| 1748 | switch (exp) { |
| 1749 | case export_unused: |
| 1750 | case export_unused_gpl: |
| 1751 | warn("modpost: module %s%s " |
| 1752 | "uses symbol '%s' marked UNUSED\n", m, e, s); |
| 1753 | break; |
| 1754 | default: |
| 1755 | /* ignore */ |
| 1756 | break; |
| 1757 | } |
| 1758 | } |
| 1759 | |
| 1760 | static void check_exports(struct module *mod) |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1761 | { |
| 1762 | struct symbol *s, *exp; |
| 1763 | |
| 1764 | for (s = mod->unres; s; s = s->next) { |
Andrew Morton | 6449bd6 | 2006-06-09 20:45:06 -0700 | [diff] [blame] | 1765 | const char *basename; |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1766 | exp = find_symbol(s->name); |
| 1767 | if (!exp || exp->module == mod) |
| 1768 | continue; |
Andrew Morton | 6449bd6 | 2006-06-09 20:45:06 -0700 | [diff] [blame] | 1769 | basename = strrchr(mod->name, '/'); |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1770 | if (basename) |
| 1771 | basename++; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 1772 | else |
| 1773 | basename = mod->name; |
| 1774 | if (!mod->gpl_compatible) |
| 1775 | check_for_gpl_usage(exp->export, basename, exp->name); |
| 1776 | check_for_unused(exp->export, basename, exp->name); |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1777 | } |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 1778 | } |
| 1779 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1780 | /** |
| 1781 | * Header for the generated file |
| 1782 | **/ |
| 1783 | static void add_header(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | { |
| 1785 | buf_printf(b, "#include <linux/module.h>\n"); |
| 1786 | buf_printf(b, "#include <linux/vermagic.h>\n"); |
| 1787 | buf_printf(b, "#include <linux/compiler.h>\n"); |
| 1788 | buf_printf(b, "\n"); |
| 1789 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); |
| 1790 | buf_printf(b, "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | buf_printf(b, "struct module __this_module\n"); |
| 1792 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); |
Ustyugov Roman | f83b5e3 | 2005-09-23 08:42:11 +0400 | [diff] [blame] | 1793 | buf_printf(b, " .name = KBUILD_MODNAME,\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | if (mod->has_init) |
| 1795 | buf_printf(b, " .init = init_module,\n"); |
| 1796 | if (mod->has_cleanup) |
| 1797 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" |
| 1798 | " .exit = cleanup_module,\n" |
| 1799 | "#endif\n"); |
Roman Zippel | e61a1c1 | 2007-05-09 02:35:15 -0700 | [diff] [blame] | 1800 | buf_printf(b, " .arch = MODULE_ARCH_INIT,\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | buf_printf(b, "};\n"); |
| 1802 | } |
| 1803 | |
Trevor Keith | 5c72513 | 2009-09-22 16:43:38 -0700 | [diff] [blame] | 1804 | static void add_staging_flag(struct buffer *b, const char *name) |
Greg Kroah-Hartman | a9860bf | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 1805 | { |
| 1806 | static const char *staging_dir = "drivers/staging"; |
| 1807 | |
| 1808 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) |
| 1809 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); |
| 1810 | } |
| 1811 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1812 | /** |
| 1813 | * Record CRCs for unresolved symbols |
| 1814 | **/ |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1815 | static int add_versions(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | { |
| 1817 | struct symbol *s, *exp; |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1818 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | |
| 1820 | for (s = mod->unres; s; s = s->next) { |
| 1821 | exp = find_symbol(s->name); |
| 1822 | if (!exp || exp->module == mod) { |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1823 | if (have_vmlinux && !s->weak) { |
Matthew Wilcox | 2a11665 | 2006-10-07 05:35:32 -0600 | [diff] [blame] | 1824 | if (warn_unresolved) { |
| 1825 | warn("\"%s\" [%s.ko] undefined!\n", |
| 1826 | s->name, mod->name); |
| 1827 | } else { |
| 1828 | merror("\"%s\" [%s.ko] undefined!\n", |
| 1829 | s->name, mod->name); |
| 1830 | err = 1; |
| 1831 | } |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1832 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | continue; |
| 1834 | } |
| 1835 | s->module = exp->module; |
| 1836 | s->crc_valid = exp->crc_valid; |
| 1837 | s->crc = exp->crc; |
| 1838 | } |
| 1839 | |
| 1840 | if (!modversions) |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1841 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
| 1843 | buf_printf(b, "\n"); |
| 1844 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 1845 | buf_printf(b, "__used\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
| 1847 | |
| 1848 | for (s = mod->unres; s; s = s->next) { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1849 | if (!s->module) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | if (!s->crc_valid) { |
Sam Ravnborg | cb80514 | 2006-01-28 16:57:26 +0100 | [diff] [blame] | 1852 | warn("\"%s\" [%s.ko] has no CRC!\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | s->name, mod->name); |
| 1854 | continue; |
| 1855 | } |
| 1856 | buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name); |
| 1857 | } |
| 1858 | |
| 1859 | buf_printf(b, "};\n"); |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 1860 | |
| 1861 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | } |
| 1863 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1864 | static void add_depends(struct buffer *b, struct module *mod, |
| 1865 | struct module *modules) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | { |
| 1867 | struct symbol *s; |
| 1868 | struct module *m; |
| 1869 | int first = 1; |
| 1870 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1871 | for (m = modules; m; m = m->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | m->seen = is_vmlinux(m->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | |
| 1874 | buf_printf(b, "\n"); |
| 1875 | buf_printf(b, "static const char __module_depends[]\n"); |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 1876 | buf_printf(b, "__used\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
| 1878 | buf_printf(b, "\"depends="); |
| 1879 | for (s = mod->unres; s; s = s->next) { |
Sam Ravnborg | a61b2df | 2007-02-26 19:46:52 +0100 | [diff] [blame] | 1880 | const char *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | if (!s->module) |
| 1882 | continue; |
| 1883 | |
| 1884 | if (s->module->seen) |
| 1885 | continue; |
| 1886 | |
| 1887 | s->module->seen = 1; |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1888 | p = strrchr(s->module->name, '/'); |
| 1889 | if (p) |
Sam Ravnborg | a61b2df | 2007-02-26 19:46:52 +0100 | [diff] [blame] | 1890 | p++; |
| 1891 | else |
| 1892 | p = s->module->name; |
| 1893 | buf_printf(b, "%s%s", first ? "" : ",", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | first = 0; |
| 1895 | } |
| 1896 | buf_printf(b, "\";\n"); |
| 1897 | } |
| 1898 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1899 | static void add_srcversion(struct buffer *b, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | { |
| 1901 | if (mod->srcversion[0]) { |
| 1902 | buf_printf(b, "\n"); |
| 1903 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", |
| 1904 | mod->srcversion); |
| 1905 | } |
| 1906 | } |
| 1907 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 1908 | static void write_if_changed(struct buffer *b, const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | { |
| 1910 | char *tmp; |
| 1911 | FILE *file; |
| 1912 | struct stat st; |
| 1913 | |
| 1914 | file = fopen(fname, "r"); |
| 1915 | if (!file) |
| 1916 | goto write; |
| 1917 | |
| 1918 | if (fstat(fileno(file), &st) < 0) |
| 1919 | goto close_write; |
| 1920 | |
| 1921 | if (st.st_size != b->pos) |
| 1922 | goto close_write; |
| 1923 | |
| 1924 | tmp = NOFAIL(malloc(b->pos)); |
| 1925 | if (fread(tmp, 1, b->pos, file) != b->pos) |
| 1926 | goto free_write; |
| 1927 | |
| 1928 | if (memcmp(tmp, b->p, b->pos) != 0) |
| 1929 | goto free_write; |
| 1930 | |
| 1931 | free(tmp); |
| 1932 | fclose(file); |
| 1933 | return; |
| 1934 | |
| 1935 | free_write: |
| 1936 | free(tmp); |
| 1937 | close_write: |
| 1938 | fclose(file); |
| 1939 | write: |
| 1940 | file = fopen(fname, "w"); |
| 1941 | if (!file) { |
| 1942 | perror(fname); |
| 1943 | exit(1); |
| 1944 | } |
| 1945 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { |
| 1946 | perror(fname); |
| 1947 | exit(1); |
| 1948 | } |
| 1949 | fclose(file); |
| 1950 | } |
| 1951 | |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 1952 | /* parse Module.symvers file. line format: |
Sam Ravnborg | 534b89a | 2006-07-01 10:10:19 +0200 | [diff] [blame] | 1953 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 1954 | **/ |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1955 | static void read_dump(const char *fname, unsigned int kernel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | { |
| 1957 | unsigned long size, pos = 0; |
| 1958 | void *file = grab_file(fname, &size); |
| 1959 | char *line; |
| 1960 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1961 | if (!file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | /* No symbol versions, silently ignore */ |
| 1963 | return; |
| 1964 | |
| 1965 | while ((line = get_next_line(&pos, file, size))) { |
Sam Ravnborg | 534b89a | 2006-07-01 10:10:19 +0200 | [diff] [blame] | 1966 | char *symname, *modname, *d, *export, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | unsigned int crc; |
| 1968 | struct module *mod; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 1969 | struct symbol *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | |
| 1971 | if (!(symname = strchr(line, '\t'))) |
| 1972 | goto fail; |
| 1973 | *symname++ = '\0'; |
| 1974 | if (!(modname = strchr(symname, '\t'))) |
| 1975 | goto fail; |
| 1976 | *modname++ = '\0'; |
Laurent Riffard | 9ac545b | 2006-06-11 08:02:06 +0200 | [diff] [blame] | 1977 | if ((export = strchr(modname, '\t')) != NULL) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 1978 | *export++ = '\0'; |
Sam Ravnborg | 534b89a | 2006-07-01 10:10:19 +0200 | [diff] [blame] | 1979 | if (export && ((end = strchr(export, '\t')) != NULL)) |
| 1980 | *end = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | crc = strtoul(line, &d, 16); |
| 1982 | if (*symname == '\0' || *modname == '\0' || *d != '\0') |
| 1983 | goto fail; |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 1984 | mod = find_module(modname); |
| 1985 | if (!mod) { |
| 1986 | if (is_vmlinux(modname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | have_vmlinux = 1; |
Jan Beulich | 0fa3a88 | 2009-03-12 12:28:30 +0000 | [diff] [blame] | 1988 | mod = new_module(modname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | mod->skip = 1; |
| 1990 | } |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 1991 | s = sym_add_exported(symname, mod, export_no(export)); |
Sam Ravnborg | 8e70c45 | 2006-01-28 22:22:33 +0100 | [diff] [blame] | 1992 | s->kernel = kernel; |
| 1993 | s->preloaded = 1; |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 1994 | sym_update_crc(symname, mod, crc, export_no(export)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | } |
| 1996 | return; |
| 1997 | fail: |
| 1998 | fatal("parse error in symbol dump file\n"); |
| 1999 | } |
| 2000 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 2001 | /* For normal builds always dump all symbols. |
| 2002 | * For external modules only dump symbols |
| 2003 | * that are not read from kernel Module.symvers. |
| 2004 | **/ |
| 2005 | static int dump_sym(struct symbol *sym) |
| 2006 | { |
| 2007 | if (!external_module) |
| 2008 | return 1; |
| 2009 | if (sym->vmlinux || sym->kernel) |
| 2010 | return 0; |
| 2011 | return 1; |
| 2012 | } |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 2013 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 2014 | static void write_dump(const char *fname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | { |
| 2016 | struct buffer buf = { }; |
| 2017 | struct symbol *symbol; |
| 2018 | int n; |
| 2019 | |
| 2020 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { |
| 2021 | symbol = symbolhash[n]; |
| 2022 | while (symbol) { |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 2023 | if (dump_sym(symbol)) |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 2024 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
Sam Ravnborg | 62070fa | 2006-03-03 16:46:04 +0100 | [diff] [blame] | 2025 | symbol->crc, symbol->name, |
Ram Pai | bd5cbce | 2006-06-08 22:12:53 -0700 | [diff] [blame] | 2026 | symbol->module->name, |
| 2027 | export_str(symbol->export)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | symbol = symbol->next; |
| 2029 | } |
| 2030 | } |
| 2031 | write_if_changed(&buf, fname); |
| 2032 | } |
| 2033 | |
Richard Hacker | 2d04b5a | 2008-02-28 09:40:52 +0100 | [diff] [blame] | 2034 | struct ext_sym_list { |
| 2035 | struct ext_sym_list *next; |
| 2036 | const char *file; |
| 2037 | }; |
| 2038 | |
Sam Ravnborg | 5c3ead8 | 2006-01-28 17:19:35 +0100 | [diff] [blame] | 2039 | int main(int argc, char **argv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | { |
| 2041 | struct module *mod; |
| 2042 | struct buffer buf = { }; |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 2043 | char *kernel_read = NULL, *module_read = NULL; |
| 2044 | char *dump_write = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | int opt; |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 2046 | int err; |
Richard Hacker | 2d04b5a | 2008-02-28 09:40:52 +0100 | [diff] [blame] | 2047 | struct ext_sym_list *extsym_iter; |
| 2048 | struct ext_sym_list *extsym_start = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
Richard Hacker | 2d04b5a | 2008-02-28 09:40:52 +0100 | [diff] [blame] | 2050 | while ((opt = getopt(argc, argv, "i:I:e:cmsSo:awM:K:")) != -1) { |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 2051 | switch (opt) { |
| 2052 | case 'i': |
| 2053 | kernel_read = optarg; |
| 2054 | break; |
| 2055 | case 'I': |
| 2056 | module_read = optarg; |
| 2057 | external_module = 1; |
| 2058 | break; |
Sam Ravnborg | 4ce6efe | 2008-03-23 21:38:54 +0100 | [diff] [blame] | 2059 | case 'c': |
| 2060 | cross_build = 1; |
| 2061 | break; |
Richard Hacker | 2d04b5a | 2008-02-28 09:40:52 +0100 | [diff] [blame] | 2062 | case 'e': |
| 2063 | external_module = 1; |
| 2064 | extsym_iter = |
| 2065 | NOFAIL(malloc(sizeof(*extsym_iter))); |
| 2066 | extsym_iter->next = extsym_start; |
| 2067 | extsym_iter->file = optarg; |
| 2068 | extsym_start = extsym_iter; |
| 2069 | break; |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 2070 | case 'm': |
| 2071 | modversions = 1; |
| 2072 | break; |
| 2073 | case 'o': |
| 2074 | dump_write = optarg; |
| 2075 | break; |
| 2076 | case 'a': |
| 2077 | all_versions = 1; |
| 2078 | break; |
| 2079 | case 's': |
| 2080 | vmlinux_section_warnings = 0; |
| 2081 | break; |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 2082 | case 'S': |
| 2083 | sec_mismatch_verbose = 0; |
| 2084 | break; |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 2085 | case 'w': |
| 2086 | warn_unresolved = 1; |
| 2087 | break; |
| 2088 | default: |
| 2089 | exit(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | } |
| 2091 | } |
| 2092 | |
Sam Ravnborg | 040fcc8 | 2006-01-28 22:15:55 +0100 | [diff] [blame] | 2093 | if (kernel_read) |
| 2094 | read_dump(kernel_read, 1); |
| 2095 | if (module_read) |
| 2096 | read_dump(module_read, 0); |
Richard Hacker | 2d04b5a | 2008-02-28 09:40:52 +0100 | [diff] [blame] | 2097 | while (extsym_start) { |
| 2098 | read_dump(extsym_start->file, 0); |
| 2099 | extsym_iter = extsym_start->next; |
| 2100 | free(extsym_start); |
| 2101 | extsym_start = extsym_iter; |
| 2102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | |
Sam Ravnborg | df578e7 | 2008-01-11 19:17:15 +0100 | [diff] [blame] | 2104 | while (optind < argc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | read_symbols(argv[optind++]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | |
| 2107 | for (mod = modules; mod; mod = mod->next) { |
| 2108 | if (mod->skip) |
| 2109 | continue; |
Sam Ravnborg | c96fca2 | 2006-07-01 11:44:23 +0200 | [diff] [blame] | 2110 | check_exports(mod); |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 2111 | } |
| 2112 | |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 2113 | err = 0; |
| 2114 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 2115 | for (mod = modules; mod; mod = mod->next) { |
Andi Kleen | 666ab41 | 2007-11-22 03:43:10 +0100 | [diff] [blame] | 2116 | char fname[strlen(mod->name) + 10]; |
| 2117 | |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 2118 | if (mod->skip) |
| 2119 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | |
| 2121 | buf.pos = 0; |
| 2122 | |
| 2123 | add_header(&buf, mod); |
Greg Kroah-Hartman | a9860bf | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 2124 | add_staging_flag(&buf, mod->name); |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 2125 | err |= add_versions(&buf, mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | add_depends(&buf, mod, modules); |
| 2127 | add_moddevtable(&buf, mod); |
| 2128 | add_srcversion(&buf, mod); |
| 2129 | |
| 2130 | sprintf(fname, "%s.mod.c", mod->name); |
| 2131 | write_if_changed(&buf, fname); |
| 2132 | } |
| 2133 | |
| 2134 | if (dump_write) |
| 2135 | write_dump(dump_write); |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 2136 | if (sec_mismatch_count && !sec_mismatch_verbose) |
Geert Uytterhoeven | 7c0ac49 | 2008-02-05 11:38:49 +0100 | [diff] [blame] | 2137 | warn("modpost: Found %d section mismatch(es).\n" |
| 2138 | "To see full details build your kernel with:\n" |
| 2139 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", |
| 2140 | sec_mismatch_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | |
Kirill Korotaev | c53ddac | 2006-09-07 13:08:54 -0700 | [diff] [blame] | 2142 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | } |