/* 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() */
+#include "modutils.h"
-struct globals {
- llist_t *lst;
+/*
+ * Theory of operation:
+ * - iterate over all modules and record their full path
+ * - iterate over all modules looking for "depends=" entries
+ * for each depends, look through our list of full paths and emit if found
+ */
+
+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,
+ void *data, int UNUSED_PARAM depth)
{
- llist_add_to_end(&G.lst, strdup(modulename));
+ module_info **first = (module_info **) data;
+ char *image, *ptr;
+ module_info *info;
+ size_t len = sb->st_size;
+
+ 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 = xasprintf("/%s", 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 ATTRIBUTE_UNUSED *sb,
- void *data, int ATTRIBUTE_UNUSED depth)
+static module_info *find_module(module_info *modules, const char *modname)
{
- size_t seen = 0;
- size_t len = MAXINT(ssize_t);
- void *the_module = xmalloc_open_read_close(fname, &len), *ptr = the_module;
- const char *deps;
- RESERVE_CONFIG_BUFFER(depends, 512);
- RESERVE_CONFIG_BUFFER(buf1, 512);
-
- memset(buf1, 0, sizeof(buf1));
- memset(depends, 0, sizeof(depends));
- sprintf(buf1, "\n%s:", fname);
-
- if (last_char_is(fname, 'o') == NULL) /* not a module */
- goto done;
- write((int)data, buf1, strlen(buf1));
-//bb_info_msg("[%d] fname='%s'", (int)data, fname);
- do {
- /* search for a 'd' */
- ptr = memchr(ptr, 'd', len - seen);
- if (ptr == NULL) /* no d left, done */
- break;
- if (sscanf(ptr, "depends=%s", depends) == 1)
- break;
- seen = ++ptr - the_module;
- } while (1);
-//bb_info_msg(" depends='%s'", depends);
- deps = depends;
- while (*deps) {
- llist_t * _lst = G.lst;
- ptr = memchr(deps, ',', strlen(deps));
- if (ptr != NULL)
- *(char*)ptr = '\0';
- /* remember the length of the current dependency plus eventual 0 byte */
- len = strlen(deps) + (ptr != NULL);
- 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;
- }
- if (_lst && _lst->data) {
- const char separator = ' ';
-//bb_info_msg("[%s] -> '%s'", deps, _lst->data);
- write((int)data, &separator, 1);
- write((int)data, _lst->data, strlen(_lst->data));
+ module_info *m;
- 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);
}
-done:
- RELEASE_CONFIG_BUFFER(depends);
- RELEASE_CONFIG_BUFFER(buf1);
- free(the_module);
- 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;
-// static const char moddir_base[] ALIGN1 = "/lib/modules/%s";
-
- int fd = xopen3("/tmp/modules.dep", O_CREAT|O_WRONLY|O_TRUNC,
- S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
- argv++;
- do {
- if (!recursive_action(*argv,
- ACTION_RECURSE, /* flags */
- fill_lst, /* file action */
- NULL, /* dir action */
- NULL, /* user data */
- 0) || /* depth */
- !recursive_action(*argv,
- ACTION_RECURSE, /* flags */
- fileAction, /* file action */
- NULL, /* dir action */
- (void*)fd, /* user data */
- 0)) { /* depth */
- retval = EXIT_FAILURE;
- }
- } while (*++argv);
+ 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;
+
+ /* 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 = 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)
- close(fd);
- return retval;
+ 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) {
+ while (m->aliases) {
+ printf("alias %s %s\n",
+ (char*)llist_pop(&m->aliases),
+ m->modname);
+ }
+ }
+#endif
+#if ENABLE_FEATURE_MODUTILS_SYMBOLS
+ if (!(option_mask32 & ARG_n))
+ xfreopen_write("modules.symbols", 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) {
+ while (modules) {
+ module_info *old = modules;
+ modules = modules->next;
+ free(old->name);
+ free(old->modname);
+ free(old);
+ }
+ }
+
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff