/* vi: set sw=4 ts=4: */
/*
* depmod - generate modules.dep
- * Copyright (c) 2008 Bernhard Fischer
+ * Copyright (c) 2008 Bernhard Reutner-Fischer
+ * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
+ * Copyright (c) 2008 Vladimir Dronnikov
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#undef _GNU_SOURCE
#define _GNU_SOURCE
-#include <libbb.h>
+#include "libbb.h"
+#include "modutils.h"
#include <sys/utsname.h> /* uname() */
/*
* - iterate over all modules looking for "depends=" entries
* for each depends, look through our list of full paths and emit if found
*/
-struct globals {
- llist_t *lst;
+
+typedef struct module_info {
+ struct module_info *next;
+ char *name, *modname;
+ llist_t *dependencies;
+ llist_t *aliases;
+ llist_t *symbols;
+ struct module_info *dnext, *dprev;
+} module_info;
+
+enum {
+ ARG_a = (1<<0), /* All modules, ignore mods in argv */
+ ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */
+ ARG_b = (1<<2), /* base directory when modules are in staging area */
+ ARG_e = (1<<3), /* with -F, print unresolved symbols */
+ ARG_F = (1<<4), /* System.map that contains the symbols */
+ ARG_n = (1<<5), /* dry-run, print to stdout only */
+ ARG_r = (1<<6) /* Compat dummy. Linux Makefile uses it */
};
-#define G (*(struct globals*)&bb_common_bufsiz1)
-/* We have to zero it out because of NOEXEC */
-#define INIT_G() memset(&G, 0, sizeof(G))
-static int fill_lst(const char *modulename, struct stat ATTRIBUTE_UNUSED *sb,
- void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
+static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
+ void *data, int depth UNUSED_PARAM)
{
- llist_add_to(&G.lst, xstrdup(modulename));
+ char modname[MODULE_NAME_LEN];
+ module_info **first = (module_info **) data;
+ char *image, *ptr;
+ module_info *info;
+ /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
+ size_t len = (64*1024*1024 - 4096);
+
+ if (strrstr(fname, ".ko") == NULL)
+ return TRUE;
+
+ image = xmalloc_open_zipped_read_close(fname, &len);
+ info = xzalloc(sizeof(*info));
+
+ info->next = *first;
+ *first = info;
+
+ info->dnext = info->dprev = info;
+ info->name = xasprintf("/%s", fname);
+ info->modname = xstrdup(filename2modname(fname, modname));
+ for (ptr = image; ptr < image + len - 10; ptr++) {
+ if (strncmp(ptr, "depends=", 8) == 0) {
+ char *u;
+
+ ptr += 8;
+ for (u = ptr; *u; u++)
+ if (*u == '-')
+ *u = '_';
+ ptr += string_to_llist(ptr, &info->dependencies, ",");
+ } else if (ENABLE_FEATURE_MODUTILS_ALIAS
+ && strncmp(ptr, "alias=", 6) == 0
+ ) {
+ llist_add_to(&info->aliases, xstrdup(ptr + 6));
+ ptr += strlen(ptr);
+ } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
+ && strncmp(ptr, "__ksymtab_", 10) == 0
+ ) {
+ ptr += 10;
+ if (strncmp(ptr, "gpl", 3) == 0 ||
+ strcmp(ptr, "strings") == 0)
+ continue;
+ llist_add_to(&info->symbols, xstrdup(ptr));
+ ptr += strlen(ptr);
+ }
+ }
+ free(image);
+
return TRUE;
}
-static int fileAction(const char *fname, struct stat *sb,
- void *data, int ATTRIBUTE_UNUSED depth)
+static module_info *find_module(module_info *modules, const char *modname)
{
- size_t len = sb->st_size;
- void *the_module, *ptr;
- int fd;
- char *depends, *deps;
-
-/*XXX: FIXME: does not handle compressed modules!
- * There should be a function that looks at the extension and sets up
- * open_transformer for us.
- */
- if (last_char_is(fname, 'o') == NULL) /* not a module */
- goto skip;
+ module_info *m;
- fd = xopen(fname, O_RDONLY);
- the_module = mmap(NULL, len, PROT_READ, MAP_SHARED
-#if defined MAP_POPULATE
- |MAP_POPULATE
-#endif
- , fd, 0);
- close(fd);
- if (the_module == MAP_FAILED)
- bb_perror_msg_and_die("mmap");
-
- ptr = the_module;
-
- fprintf((FILE*)data, "\n%s:", fname);
-//bb_info_msg("fname='%s'", fname);
- do {
- /* search for a 'd' */
- ptr = memchr(ptr, 'd', len);
- if (ptr == NULL) /* no d left, done */
- goto done;
- if (memcmp(ptr, "depends=", sizeof("depends=")-1) == 0)
- break;
- len -= ++ptr - the_module;
- } while (1);
- deps = depends = xstrdup (ptr + sizeof("depends=")-1);
-//bb_info_msg(" depends='%s'", depends);
- while (*deps) {
- llist_t * _lst = G.lst;
- char *buf1;
-
- ptr = strchr(deps, ',');
- if (ptr != NULL)
- *(char*)ptr = '\0';
- /* remember the length of the current dependency plus eventual 0 byte */
- len = strlen(deps) + (ptr != NULL);
- buf1 = xmalloc(len + 3);
- sprintf(buf1, "/%s.", deps); /* make sure we match the correct file */
- while (_lst) {
- ptr = strstr(_lst->data, buf1);
- if (ptr != NULL)
- break; /* found it */
- _lst = _lst->link;
- }
- free(buf1);
- if (_lst /*&& _lst->data*/) {
-//bb_info_msg("[%s] -> '%s'", deps, _lst->data);
- fprintf((FILE*)data, " %s", _lst->data);
- deps += len;
- }
+ for (m = modules; m != NULL; m = m->next)
+ if (strcmp(m->modname, modname) == 0)
+ return m;
+ return NULL;
+}
+
+static void order_dep_list(module_info *modules, module_info *start,
+ llist_t *add)
+{
+ module_info *m;
+ llist_t *n;
+
+ for (n = add; n != NULL; n = n->link) {
+ m = find_module(modules, n->data);
+ if (m == NULL)
+ continue;
+
+ /* unlink current entry */
+ m->dnext->dprev = m->dprev;
+ m->dprev->dnext = m->dnext;
+
+ /* and add it to tail */
+ m->dnext = start;
+ m->dprev = start->dprev;
+ start->dprev->dnext = m;
+ start->dprev = m;
+
+ /* recurse */
+ order_dep_list(modules, start, m->dependencies);
}
- free(depends);
-done:
- munmap(the_module, sb->st_size);
-skip:
- return TRUE;
+}
+
+static void xfreopen_write(const char *file, FILE *f)
+{
+ if (freopen(file, "w", f) == NULL)
+ bb_perror_msg_and_die("can't open '%s'", file);
}
int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
+int depmod_main(int argc UNUSED_PARAM, char **argv)
{
- int retval = EXIT_SUCCESS;
- char *moddir_base, *system_map, *chp;
- FILE *filedes = stdout;
- enum {
- ARG_a = (1<<0), /* All modules, ignore mods in argv */
- ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */
- ARG_b = (1<<2), /* not /lib/modules/$(uname -r)/ but this base-dir */
- ARG_e = (1<<3), /* with -F, print unresolved symbols */
- ARG_F = (1<<4), /* System.map that contains the symbols */
- ARG_n = (1<<5) /* dry-run, print to stdout only */
- };
-
- getopt32(argv, "aAb:eF:n", &moddir_base, &system_map);
+ module_info *modules = NULL, *m, *dep;
+ const char *moddir_base = "/";
+ char *moddir, *version;
+ struct utsname uts;
+ int tmp;
+
+ getopt32(argv, "aAb:eF:nr", &moddir_base, NULL);
argv += optind;
- if (*argv) /* got a version to use? */
- chp = *argv++;
- else {
- struct utsname uts;
- if (uname(&uts) < 0)
- bb_simple_perror_msg_and_die("uname");
- chp = xstrdup(uts.release);
+
+ /* goto modules location */
+ xchdir(moddir_base);
+
+ /* If a version is provided, then that kernel version's module directory
+ * is used, rather than the current kernel version (as returned by
+ * "uname -r"). */
+ if (*argv && sscanf(*argv, "%d.%d.%d", &tmp, &tmp, &tmp) == 3) {
+ version = *argv++;
+ } else {
+ uname(&uts);
+ version = uts.release;
}
- moddir_base
- = concat_path_file(option_mask32 & ARG_b ? moddir_base : "/lib/modules",
- chp);
+ moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
+
+ /* Scan modules */
+ if (*argv) {
+ char *modfile;
+ struct stat sb;
+ do {
+ modfile = concat_path_file(moddir, *argv);
+ xstat(modfile, &sb);
+ parse_module(modfile, &sb, &modules, 0);
+ free(modfile);
+ } while (*(++argv));
+ } else {
+ recursive_action(moddir, ACTION_RECURSE,
+ parse_module, NULL, &modules, 0);
+ }
+
+ /* Prepare for writing out the dep files */
+ xchdir(moddir);
if (ENABLE_FEATURE_CLEAN_UP)
- free(chp);
- if (!(option_mask32 & ARG_n)) {
- char *modules_dep = concat_path_file(moddir_base, "modules.dep");
- filedes = xfopen(modules_dep, "w");
- if (ENABLE_FEATURE_CLEAN_UP)
- free(modules_dep);
+ free(moddir);
+
+ /* Generate dependency and alias files */
+ if (!(option_mask32 & ARG_n))
+ xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
+ for (m = modules; m != NULL; m = m->next) {
+ printf("%s:", m->name);
+
+ order_dep_list(modules, m, m->dependencies);
+ while (m->dnext != m) {
+ dep = m->dnext;
+ printf(" %s", dep->name);
+
+ /* unlink current entry */
+ dep->dnext->dprev = dep->dprev;
+ dep->dprev->dnext = dep->dnext;
+ dep->dnext = dep->dprev = dep;
+ }
+ bb_putchar('\n');
+ }
+
+#if ENABLE_FEATURE_MODUTILS_ALIAS
+ if (!(option_mask32 & ARG_n))
+ xfreopen_write("modules.alias", stdout);
+ for (m = modules; m != NULL; m = m->next) {
+ const char *fname = bb_basename(m->name);
+ int fnlen = strchrnul(fname, '.') - fname;
+ while (m->aliases) {
+ /* Last word can well be m->modname instead,
+ * but depmod from module-init-tools 3.4
+ * uses module basename, i.e., no s/-/_/g.
+ * (pathname and .ko.* are still stripped)
+ * Mimicking that... */
+ printf("alias %s %.*s\n",
+ (char*)llist_pop(&m->aliases),
+ fnlen, fname);
+ }
}
- do {
- chp = concat_path_file(moddir_base,
- option_mask32 & ARG_a ? "/" : *argv++);
-
- if (!recursive_action(chp,
- ACTION_RECURSE, /* flags */
- fill_lst, /* file action */
- NULL, /* dir action */
- NULL, /* user data */
- 0) || /* depth */
- !recursive_action(chp,
- ACTION_RECURSE, /* flags */
- fileAction, /* file action */
- NULL, /* dir action */
- (void*)filedes, /* user data */
- 0)) { /* depth */
- retval = EXIT_FAILURE;
+#endif
+#if ENABLE_FEATURE_MODUTILS_SYMBOLS
+ if (!(option_mask32 & ARG_n))
+ xfreopen_write("modules.symbols", stdout);
+ for (m = modules; m != NULL; m = m->next) {
+ const char *fname = bb_basename(m->name);
+ int fnlen = strchrnul(fname, '.') - fname;
+ while (m->symbols) {
+ printf("alias symbol:%s %.*s\n",
+ (char*)llist_pop(&m->symbols),
+ fnlen, fname);
}
- if (ENABLE_FEATURE_CLEAN_UP)
- free(chp);
- } while (!(option_mask32 & ARG_a) || *argv);
+ }
+#endif
if (ENABLE_FEATURE_CLEAN_UP) {
- fclose(filedes);
- llist_free(G.lst, free);
- free(moddir_base);
+ while (modules) {
+ module_info *old = modules;
+ modules = modules->next;
+ free(old->name);
+ free(old->modname);
+ free(old);
+ }
}
- return retval;
+
+ return EXIT_SUCCESS;
}