/* 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.
*/
#define _GNU_SOURCE
#include <libbb.h>
#include <sys/utsname.h> /* uname() */
-#if ENABLE_DEBUG
-#include <assert.h>
-#define dbg_assert assert
-#else
-#define dbg_assert(stuff) do {} while (0)
-#endif
+#include "modutils.h"
+
/*
* Theory of operation:
* - iterate over all modules and record their full path
* for each depends, look through our list of full paths and emit if found
*/
-typedef struct dep_lst_t {
- char *name;
+typedef struct module_info {
+ struct module_info *next;
+ char *name, *modname;
llist_t *dependencies;
- struct dep_lst_t *next;
-} dep_lst_t;
-
-struct globals {
- dep_lst_t *lst; /* modules without their corresponding extension */
- size_t moddir_base_len; /* length of the "-b basedir" */
+ 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), /* 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 */
};
-#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,
+ void *data, int UNUSED_PARAM depth)
{
+ module_info **first = (module_info **) data;
+ char *image, *ptr;
+ module_info *info;
+ size_t len = sb->st_size;
- /* We get a file here. If the file does not have ".ko" but an
- * intermittent dentry has, it's just their fault.
- */
- if (strrstr(modulename, ".ko") != NULL) {
- dep_lst_t *new = xzalloc(sizeof(dep_lst_t));
- new->name = xstrdup(modulename + G.moddir_base_len);
- new->next = G.lst;
- G.lst = new;
+ if (strrstr(fname, ".ko") == NULL)
+ return TRUE;
+
+ image = xmalloc_open_zipped_read_close(fname, &len);
+ info = xzalloc(sizeof(module_info));
+
+ info->next = *first;
+ *first = info;
+
+ info->dnext = info->dprev = info;
+ info->name = xstrdup(fname);
+ info->modname = filename2modname(fname, NULL);
+ 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 ATTRIBUTE_UNUSED *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;
- char *ptr;
- int fd;
- char *depends, *deps;
- dep_lst_t *this;
-
- if (strrstr(fname, ".ko") == NULL) /* not a module */
- goto skip;
+ module_info *m;
-/*XXX: FIXME: does not handle compressed modules!
- * There should be a function that looks at the extension and sets up
- * open_transformer for us.
- */
- 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;
- this = G.lst;
- do {
- if (!strcmp(fname + G.moddir_base_len, this->name))
- break;
- this = this->next;
- } while (this);
- dbg_assert (this);
-//bb_info_msg("fname='%s'", fname + G.moddir_base_len);
- do {
- /* search for a 'd' */
- ptr = memchr(ptr, 'd', len - (ptr - (char*)the_module));
- if (ptr == NULL) /* no d left, done */
- goto none;
- if (!strncmp(ptr, "depends=", sizeof("depends=")-1))
- break;
- ++ptr;
- } while (1);
- deps = depends = xstrdup (ptr + sizeof("depends=")-1);
-//bb_info_msg(" depends='%s'", depends);
- while (deps) {
- dep_lst_t *all = G.lst;
+ for (m = modules; m != NULL; m = m->next)
+ if (strcmp(m->modname, modname) == 0)
+ return m;
+ return NULL;
+}
- ptr = strsep(&deps, ",");
- while (all) {
- /* Compare the recorded filenames ignoring ".ko*" at the end. */
- char *tmp = bb_get_last_path_component_nostrip(all->name);
- if (!strncmp(ptr, tmp, MAX(strlen(ptr),strrstr(tmp, ".ko") - tmp)))
- break; /* found it */
- all = all->next;
- }
- if (all) {
- dbg_assert(all->name); /* this cannot be empty */
-//bb_info_msg("[%s] -> '%s'", (char*)ptr, all->name);
- llist_add_to_end(&this->dependencies, all->name);
- }
+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);
- none:
- munmap(the_module, sb->st_size);
- skip:
- return TRUE;
}
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 ret;
- char *moddir_base = NULL, *moddir, *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 */
- };
- INIT_G();
+ module_info *modules = NULL, *m, *dep;
+ char *moddir_base = (char *)CONFIG_DEFAULT_MODULES_DIR;
+ int tmp;
- getopt32(argv, "aAb:eF:n", &moddir_base, &system_map);
+ getopt32(argv, "aAb:eF:n", &moddir_base, NULL);
argv += optind;
- /* If a version is provided, then that kernel version’s module directory
+ /* goto modules location */
+
+ /* 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", &ret, &ret, &ret) == 3)) {
- moddir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, *argv++);
+ xchdir(moddir_base);
+ if (*argv && (sscanf(*argv, "%d.%d.%d", &tmp, &tmp, &tmp) == 3)) {
+ xchdir(*argv++);
} else {
struct utsname uts;
- if (uname(&uts) < 0)
- bb_simple_perror_msg_and_die("uname");
- moddir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, uts.release);
+ uname(&uts);
+ xchdir(uts.release);
}
/* If no modules are given on the command-line, -a is on per default. */
option_mask32 |= *argv == NULL;
- if (option_mask32 & ARG_b) {
- G.moddir_base_len = strlen(moddir_base);
- if (ENABLE_FEATURE_CLEAN_UP) {
- chp = moddir;
- moddir = concat_path_file(moddir_base, moddir);
- free (chp);
- } else
- moddir = concat_path_file(moddir_base, moddir);
- }
-
- if (!(option_mask32 & ARG_n)) { /* --dry-run */
- chp = concat_path_file(moddir, CONFIG_DEFAULT_DEPMOD_FILE);
- filedes = xfopen(chp, "w");
- if (ENABLE_FEATURE_CLEAN_UP)
- free(chp);
- }
- ret = EXIT_SUCCESS;
- /* We have to do a full walk to collect all needed data. */
- if (!recursive_action(moddir,
- ACTION_RECURSE, /* flags */
- fill_lst, /* file action */
- NULL, /* dir action */
- NULL, /* user data */
- 0)) { /* depth */
- if (ENABLE_FEATURE_CLEAN_UP)
- ret = EXIT_FAILURE;
- else
- return EXIT_FAILURE;
- }
-#if ENABLE_FEATURE_CLEAN_UP
- else
-#endif
+ /* Scan modules */
+ moddir_base = xrealloc_getcwd_or_warn(NULL);
do {
- chp = option_mask32 & ARG_a ? moddir : *argv++;
-
- if (!recursive_action(chp,
- ACTION_RECURSE, /* flags */
- fileAction, /* file action */
- NULL, /* dir action */
- NULL, /* user data */
- 0)) { /* depth */
- ret = EXIT_FAILURE;
+ recursive_action((option_mask32 & ARG_a) ? moddir_base : *argv,
+ ACTION_RECURSE, parse_module, NULL, &modules, 0);
+ } while (!(option_mask32 & ARG_a) && *(++argv));
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(moddir_base);
+
+ /* Generate dependency and alias files */
+ if (!(option_mask32 & ARG_n))
+ freopen(CONFIG_DEFAULT_DEPMOD_FILE, "w", 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;
}
- } while (!(option_mask32 & ARG_a) && *argv);
+ puts("");
+ }
- /* modprobe allegedly wants dependencies without duplicates, i.e.
- * mod1: mod2 mod3
- * mod2: mod3
- * mod3:
- * implies that mod1 directly depends on mod2 and _not_ mod3 as mod3 is
- * already implicitely pulled in via mod2. This leaves us with:
- * mod1: mod2
- * mod2: mod3
- * mod3:
- */
- {
- dep_lst_t *mods = G.lst;
-#if ENABLE_FEATURE_DEPMOD_PRUNE_FANCY
- while (mods) {
- llist_t *deps = mods->dependencies;
- while (deps) {
- dep_lst_t *all = G.lst;
- while (all) {
- if (!strcmp(all->name, deps->data)) {
- llist_t *implied = all->dependencies;
- while (implied) {
- /* erm, nicer would be to just
- * llist_unlink(&mods->dependencies, implied) */
- llist_t *prune = mods->dependencies;
- while (prune) {
- if (!strcmp(implied->data, prune->data))
- break;
- prune = prune->link;
- }
-//if (prune) bb_info_msg("[%s] '%s' implies '%s', removing", mods->name, all->name, implied->data);
- llist_unlink(&mods->dependencies, prune);
- implied = implied->link;
- }
- }
- all = all->next;
- }
- deps = deps->link;
+#if ENABLE_FEATURE_MODUTILS_ALIAS
+ if (!(option_mask32 & ARG_n))
+ freopen("modules.alias", "w", stdout);
+ for (m = modules; m != NULL; m = m->next) {
+ while (m->aliases) {
+ printf("alias %s %s\n",
+ (char*)llist_pop(&m->aliases),
+ m->modname);
}
- mods = mods->next;
}
-
- mods = G.lst;
#endif
- /* Finally print them. */
- while (mods) {
- fprintf(filedes, "%s:", mods->name);
- while (mods->dependencies)
- fprintf(filedes, " %s", (char*)llist_pop(&mods->dependencies));
- fprintf(filedes, "\n");
- mods = mods->next;
- }
+#if ENABLE_FEATURE_MODUTILS_SYMBOLS
+ if (!(option_mask32 & ARG_n))
+ freopen("modules.symbols", "w", stdout);
+ for (m = modules; m != NULL; m = m->next) {
+ while (m->symbols) {
+ printf("alias symbol:%s %s\n",
+ (char*)llist_pop(&m->symbols),
+ m->modname);
+ }
}
+#endif
if (ENABLE_FEATURE_CLEAN_UP) {
- fclose_if_not_stdin(filedes);
- free(moddir);
- while (G.lst) {
- dep_lst_t *old = G.lst;
- G.lst = G.lst->next;
+ while (modules) {
+ module_info *old = modules;
+ modules = modules->next;
free(old->name);
+ free(old->modname);
free(old);
}
}
- return ret;
+
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff