| /* vi: set sw=4 ts=4: */ |
| /* |
| * depmod - generate modules.dep |
| * 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 <sys/utsname.h> /* uname() */ |
| #include "modutils.h" |
| |
| /* |
| * 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 */ |
| }; |
| |
| 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; |
| |
| 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 module_info *find_module(module_info *modules, const char *modname) |
| { |
| module_info *m; |
| |
| 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); |
| } |
| } |
| |
| 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 argc UNUSED_PARAM, char **argv) |
| { |
| module_info *modules = NULL, *m, *dep; |
| const char *moddir_base = "/"; |
| char *moddir, *version; |
| struct utsname uts; |
| int tmp; |
| |
| getopt32(argv, "aAb:eF:n", &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) |
| 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; |
| } |