1 /* vi: set sw=4 ts=4: */
3 * depmod - generate modules.dep
4 * Copyright (c) 2008 Bernhard Reutner-Fischer
5 * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
6 * Copyright (c) 2008 Vladimir Dronnikov
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 #include <sys/utsname.h> /* uname() */
18 * Theory of operation:
19 * - iterate over all modules and record their full path
20 * - iterate over all modules looking for "depends=" entries
21 * for each depends, look through our list of full paths and emit if found
24 typedef struct module_info {
25 struct module_info *next;
27 llist_t *dependencies;
30 struct module_info *dnext, *dprev;
34 ARG_a = (1<<0), /* All modules, ignore mods in argv */
35 ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */
36 ARG_b = (1<<2), /* base directory when modules are in staging area */
37 ARG_e = (1<<3), /* with -F, print unresolved symbols */
38 ARG_F = (1<<4), /* System.map that contains the symbols */
39 ARG_n = (1<<5), /* dry-run, print to stdout only */
40 ARG_r = (1<<6) /* Compat dummy. Linux Makefile uses it */
43 static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
44 void *data, int depth UNUSED_PARAM)
46 char modname[MODULE_NAME_LEN];
47 module_info **first = (module_info **) data;
50 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
51 size_t len = (64*1024*1024 - 4096);
53 if (strrstr(fname, ".ko") == NULL)
56 image = xmalloc_open_zipped_read_close(fname, &len);
57 info = xzalloc(sizeof(*info));
62 info->dnext = info->dprev = info;
63 info->name = xasprintf("/%s", fname);
64 info->modname = xstrdup(filename2modname(fname, modname));
65 for (ptr = image; ptr < image + len - 10; ptr++) {
66 if (strncmp(ptr, "depends=", 8) == 0) {
70 for (u = ptr; *u; u++)
73 ptr += string_to_llist(ptr, &info->dependencies, ",");
74 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
75 && strncmp(ptr, "alias=", 6) == 0
77 llist_add_to(&info->aliases, xstrdup(ptr + 6));
79 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
80 && strncmp(ptr, "__ksymtab_", 10) == 0
83 if (strncmp(ptr, "gpl", 3) == 0
84 || strcmp(ptr, "strings") == 0
88 llist_add_to(&info->symbols, xstrdup(ptr));
97 static module_info *find_module(module_info *modules, const char *modname)
101 for (m = modules; m != NULL; m = m->next)
102 if (strcmp(m->modname, modname) == 0)
107 static void order_dep_list(module_info *modules, module_info *start,
113 for (n = add; n != NULL; n = n->link) {
114 m = find_module(modules, n->data);
118 /* unlink current entry */
119 m->dnext->dprev = m->dprev;
120 m->dprev->dnext = m->dnext;
122 /* and add it to tail */
124 m->dprev = start->dprev;
125 start->dprev->dnext = m;
129 order_dep_list(modules, start, m->dependencies);
133 static void xfreopen_write(const char *file, FILE *f)
135 if (freopen(file, "w", f) == NULL)
136 bb_perror_msg_and_die("can't open '%s'", file);
139 int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
140 int depmod_main(int argc UNUSED_PARAM, char **argv)
142 module_info *modules = NULL, *m, *dep;
143 const char *moddir_base = "/";
144 char *moddir, *version;
148 getopt32(argv, "aAb:eF:nr", &moddir_base, NULL);
151 /* goto modules location */
154 /* If a version is provided, then that kernel version's module directory
155 * is used, rather than the current kernel version (as returned by
157 if (*argv && sscanf(*argv, "%d.%d.%d", &tmp, &tmp, &tmp) == 3) {
161 version = uts.release;
163 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
170 modfile = concat_path_file(moddir, *argv);
172 parse_module(modfile, &sb, &modules, 0);
176 recursive_action(moddir, ACTION_RECURSE,
177 parse_module, NULL, &modules, 0);
180 /* Prepare for writing out the dep files */
182 if (ENABLE_FEATURE_CLEAN_UP)
185 /* Generate dependency and alias files */
186 if (!(option_mask32 & ARG_n))
187 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
188 for (m = modules; m != NULL; m = m->next) {
189 printf("%s:", m->name);
191 order_dep_list(modules, m, m->dependencies);
192 while (m->dnext != m) {
194 printf(" %s", dep->name);
196 /* unlink current entry */
197 dep->dnext->dprev = dep->dprev;
198 dep->dprev->dnext = dep->dnext;
199 dep->dnext = dep->dprev = dep;
204 #if ENABLE_FEATURE_MODUTILS_ALIAS
205 if (!(option_mask32 & ARG_n))
206 xfreopen_write("modules.alias", stdout);
207 for (m = modules; m != NULL; m = m->next) {
208 const char *fname = bb_basename(m->name);
209 int fnlen = strchrnul(fname, '.') - fname;
211 /* Last word can well be m->modname instead,
212 * but depmod from module-init-tools 3.4
213 * uses module basename, i.e., no s/-/_/g.
214 * (pathname and .ko.* are still stripped)
215 * Mimicking that... */
216 printf("alias %s %.*s\n",
217 (char*)llist_pop(&m->aliases),
222 #if ENABLE_FEATURE_MODUTILS_SYMBOLS
223 if (!(option_mask32 & ARG_n))
224 xfreopen_write("modules.symbols", stdout);
225 for (m = modules; m != NULL; m = m->next) {
226 const char *fname = bb_basename(m->name);
227 int fnlen = strchrnul(fname, '.') - fname;
229 printf("alias symbol:%s %.*s\n",
230 (char*)llist_pop(&m->symbols),
236 if (ENABLE_FEATURE_CLEAN_UP) {
238 module_info *old = modules;
239 modules = modules->next;