2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/boot/common/module.c,v 1.25 2003/08/25 23:30:41 obrien Exp $
27 * $DragonFly: src/sys/boot/common/module.c,v 1.6 2008/09/02 17:21:12 dillon Exp $
31 * file/module function dispatcher, support, etc.
36 #include <sys/param.h>
37 #include <sys/linker.h>
38 #include <sys/module.h>
39 #include <sys/queue.h>
41 #include "bootstrap.h"
43 #define MDIR_REMOVED 0x0001
44 #define MDIR_NOHINTS 0x0002
47 char *d_path; /* path of modules directory */
48 u_char *d_hints; /* content of linker.hints file */
49 int d_hintsz; /* size of hints data */
51 STAILQ_ENTRY(moduledir) d_link;
54 static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
55 static int file_loadraw(char *type, char *name);
56 static int file_load_dependencies(struct preloaded_file *base_mod);
57 static char * file_search(const char *name, char **extlist);
58 static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
59 static int file_havepath(const char *name);
60 static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
61 static void file_insert_tail(struct preloaded_file *mp);
62 struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
63 static void moduledir_readhints(struct moduledir *mdp);
64 static void moduledir_rebuild(void);
66 /* load address should be tweaked by first module loaded (kernel) */
67 static vm_offset_t loadaddr = 0;
69 static const char *default_searchpath ="modules;KERNEL";
71 static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
73 struct preloaded_file *preloaded_files = NULL;
75 static char *kld_ext_list[] = {
81 COMMAND_SET(slow, "slow", "slow print", command_slow);
86 command_slow(int argc, char *argv[])
99 for (i = 0; i < 10; ++i)
105 * load an object, either a disk file or code module.
107 * To load a file, the syntax is:
109 * load -t <type> <path>
111 * code modules are loaded as:
113 * load <path> <options>
115 COMMAND_SET(load, "load", "load a kernel or module", command_load);
118 command_load(int argc, char *argv[])
121 int dofile, dokld, ch, error;
128 command_errmsg = "no filename specified";
131 while ((ch = getopt(argc, argv, "kt:")) != -1) {
142 /* getopt has already reported an error */
146 argv += (optind - 1);
147 argc -= (optind - 1);
150 * Request to load a raw file?
153 if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
154 command_errmsg = "invalid load type";
157 return(file_loadraw(typestr, argv[1]));
160 * Do we have explicit KLD load ?
162 if (dokld || file_havepath(argv[1])) {
163 error = mod_loadkld(argv[1], argc - 2, argv + 2);
165 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]);
166 return (error == 0 ? CMD_OK : CMD_ERROR);
169 * Looks like a request for a module.
171 error = mod_load(argv[1], NULL, argc - 2, argv + 2);
173 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
174 return (error == 0 ? CMD_OK : CMD_ERROR);
177 COMMAND_SET(unload, "unload", "unload all modules", command_unload);
180 command_unload(int argc, char *argv[])
182 struct preloaded_file *fp;
184 while (preloaded_files != NULL) {
185 fp = preloaded_files;
186 preloaded_files = preloaded_files->f_next;
190 unsetenv("kernelname");
194 COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
197 command_lsmod(int argc, char *argv[])
199 struct preloaded_file *fp;
200 struct kernel_module *mp;
201 struct file_metadata *md;
208 while ((ch = getopt(argc, argv, "v")) != -1) {
215 /* getopt has already reported an error */
221 for (fp = preloaded_files; fp; fp = fp->f_next) {
222 sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
223 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
225 if (fp->f_args != NULL) {
226 pager_output(" args: ");
227 pager_output(fp->f_args);
231 pager_output(" modules: ");
232 for (mp = fp->f_modules; mp; mp = mp->m_next) {
233 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
239 /* XXX could add some formatting smarts here to display some better */
240 for (md = fp->f_metadata; md != NULL; md = md->md_next) {
241 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
251 * File level interface, functions file_*
254 file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
256 struct preloaded_file *fp;
261 for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
262 error = (file_formats[i]->l_load)(filename, loadaddr, &fp);
264 fp->f_loader = i; /* remember the loader */
269 continue; /* Unknown to this handler? */
271 sprintf(command_errbuf, "can't load file '%s': %s",
272 filename, strerror(error));
280 file_load_dependencies(struct preloaded_file *base_file) {
281 struct file_metadata *md;
282 struct preloaded_file *fp;
283 struct mod_depend *verinfo;
284 struct kernel_module *mp;
288 md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
293 verinfo = (struct mod_depend*)md->md_data;
294 dmodname = (char *)(verinfo + 1);
295 if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
296 printf("loading required module '%s'\n", dmodname);
297 error = mod_load(dmodname, verinfo, 0, NULL);
301 * If module loaded via kld name which isn't listed
302 * in the linker.hints file, we should check if it have
305 mp = file_findmodule(NULL, dmodname, verinfo);
307 sprintf(command_errbuf, "module '%s' exists but with wrong version",
313 md = metadata_next(md, MODINFOMD_DEPLIST);
317 /* Load failed; discard everything */
318 while (base_file != NULL) {
320 base_file = base_file->f_next;
326 * We've been asked to load (name) as (type), so just suck it in,
327 * no arguments or anything.
330 file_loadraw(char *type, char *name)
332 struct preloaded_file *fp;
337 /* We can't load first */
338 if ((file_findfile(NULL, NULL)) == NULL) {
339 command_errmsg = "can't load file before kernel";
343 /* locate the file on the load path */
344 cp = file_search(name, NULL);
346 sprintf(command_errbuf, "can't find '%s'", name);
351 if ((fd = rel_open(name, NULL, O_RDONLY)) < 0) {
352 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
359 /* read in 4k chunks; size is not really important */
360 got = archsw.arch_readin(fd, laddr, 4096);
361 if (got == 0) /* end of file */
363 if (got < 0) { /* error */
364 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
372 /* Looks OK so far; create & populate control structure */
375 fp->f_type = strdup(type);
377 fp->f_metadata = NULL;
379 fp->f_addr = loadaddr;
380 fp->f_size = laddr - loadaddr;
382 /* recognise space consumption */
385 /* Add to the list of loaded files */
386 file_insert_tail(fp);
392 * Load the module (name), pass it (argc),(argv), add container file
393 * to the list of loaded files.
394 * If module is already loaded just assign new argc/argv.
397 mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
399 struct kernel_module *mp;
403 if (file_havepath(modname)) {
404 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
405 return (mod_loadkld(modname, argc, argv));
407 /* see if module is already loaded */
408 mp = file_findmodule(NULL, modname, verinfo);
413 mp->m_args = unargv(argc, argv);
415 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name);
418 /* locate file with the module on the search path */
419 filename = mod_searchmodule(modname, verinfo);
420 if (filename == NULL) {
421 sprintf(command_errbuf, "can't find '%s'", modname);
424 err = mod_loadkld(filename, argc, argv);
429 * Load specified KLD. If path is omitted, then try to locate it via
433 mod_loadkld(const char *kldname, int argc, char *argv[])
435 struct preloaded_file *fp, *last_file;
440 * Get fully qualified KLD name
442 filename = file_search(kldname, kld_ext_list);
443 if (filename == NULL) {
444 sprintf(command_errbuf, "can't find '%s'", kldname);
448 * Check if KLD already loaded
450 fp = file_findfile(filename, NULL);
452 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename);
456 for (last_file = preloaded_files;
457 last_file != NULL && last_file->f_next != NULL;
458 last_file = last_file->f_next)
462 err = file_load(filename, loadaddr, &fp);
465 fp->f_args = unargv(argc, argv);
466 loadaddr = fp->f_addr + fp->f_size;
467 file_insert_tail(fp); /* Add to the list of loaded files */
468 if (file_load_dependencies(fp) != 0) {
470 last_file->f_next = NULL;
471 loadaddr = last_file->f_addr + last_file->f_size;
477 sprintf(command_errbuf, "don't know how to load module '%s'", filename);
485 * Find a file matching (name) and (type).
486 * NULL may be passed as a wildcard to either.
488 struct preloaded_file *
489 file_findfile(char *name, char *type)
491 struct preloaded_file *fp;
493 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
494 if (((name == NULL) || !strcmp(name, fp->f_name)) &&
495 ((type == NULL) || !strcmp(type, fp->f_type)))
502 * Find a module matching (name) inside of given file.
503 * NULL may be passed as a wildcard.
505 struct kernel_module *
506 file_findmodule(struct preloaded_file *fp, char *modname,
507 struct mod_depend *verinfo)
509 struct kernel_module *mp, *best;
513 for (fp = preloaded_files; fp; fp = fp->f_next) {
514 mp = file_findmodule(fp, modname, verinfo);
522 for (mp = fp->f_modules; mp; mp = mp->m_next) {
523 if (strcmp(modname, mp->m_name) == 0) {
526 mver = mp->m_version;
527 if (mver == verinfo->md_ver_preferred)
529 if (mver >= verinfo->md_ver_minimum &&
530 mver <= verinfo->md_ver_maximum &&
540 * Make a copy of (size) bytes of data from (p), and associate them as
541 * metadata of (type) to the module (mp).
544 file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
546 struct file_metadata *md;
548 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
551 bcopy(p, md->md_data, size);
552 md->md_next = fp->f_metadata;
557 * Find a metadata object of (type) associated with the file (fp)
559 struct file_metadata *
560 file_findmetadata(struct preloaded_file *fp, int type)
562 struct file_metadata *md;
564 for (md = fp->f_metadata; md != NULL; md = md->md_next)
565 if (md->md_type == type)
570 struct file_metadata *
571 metadata_next(struct file_metadata *md, int type)
575 while((md = md->md_next) != NULL)
576 if (md->md_type == type)
581 static char *emptyextlist[] = { "", NULL };
584 * Check if the given file is in place and return full path to it.
587 file_lookup(const char *path, const char *name, int namelen, char **extlist)
590 char *result, *cp, **cpp;
591 int pathlen, extlen, len;
593 pathlen = strlen(path);
596 extlist = emptyextlist;
597 for (cpp = extlist; *cpp; cpp++) {
602 result = malloc(pathlen + namelen + extlen + 2 + 7 + 1);
605 bcopy(path, result, pathlen);
606 if (pathlen > 0 && result[pathlen - 1] != '/')
607 result[pathlen++] = '/';
608 cp = result + pathlen;
609 bcopy(name, cp, namelen);
611 for (cpp = extlist; *cpp; cpp++) {
613 if (rel_stat(result, &st) == 0) {
614 if (S_ISREG(st.st_mode)) {
616 } else if (S_ISDIR(st.st_mode)) {
617 strcat(result, "/kernel");
618 if (rel_stat(result, &st) == 0 && S_ISREG(st.st_mode)) {
629 * Check if file name have any qualifiers
632 file_havepath(const char *name)
636 archsw.arch_getdev(NULL, name, &cp);
637 return (cp != name || strchr(name, '/') != NULL);
641 * Attempt to find the file (name) on the module searchpath.
642 * If (name) is qualified in any way, we simply check it and
643 * return it or NULL. If it is not qualified, then we attempt
644 * to construct a path using entries in the environment variable
647 * The path we return a pointer to need never be freed, as we manage
651 file_search(const char *name, char **extlist)
653 struct moduledir *mdp;
658 /* Don't look for nothing */
663 return(strdup(name));
666 * Qualified name. If it is a directory tag on
669 if (file_havepath(name)) {
670 /* Qualified, so just see if it exists */
671 if (rel_stat(name, &sb) == 0) {
672 if (S_ISDIR(sb.st_mode)) {
673 result = malloc(strlen(name) + 7 + 1);
674 sprintf(result, "%s/kernel", name);
677 return(strdup(name));
684 namelen = strlen(name);
685 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
686 result = file_lookup(mdp->d_path, name, namelen, extlist);
693 #define INT_ALIGN(base, ptr) ptr = \
694 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
697 mod_search_hints(struct moduledir *mdp, const char *modname,
698 struct mod_depend *verinfo)
700 u_char *cp, *recptr, *bufend, *best;
702 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
704 moduledir_readhints(mdp);
705 modnamelen = strlen(modname);
709 if (mdp->d_hints == NULL)
711 recptr = mdp->d_hints;
712 bufend = recptr + mdp->d_hintsz;
715 while (recptr < bufend && !found) {
723 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
726 INT_ALIGN(mdp->d_hints, cp);
730 if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
734 if (ival >= verinfo->md_ver_minimum &&
735 ival <= verinfo->md_ver_maximum &&
745 recptr += reclen + sizeof(int);
748 * Finally check if KLD is in the place
751 result = file_lookup(mdp->d_path, cp, clen, NULL);
753 result = file_lookup(mdp->d_path, best, blen, NULL);
756 * If nothing found or hints is absent - fallback to the old way
757 * by using "kldname[.ko]" as module name.
759 if (!found && !bestver && result == NULL)
760 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
765 * Attempt to locate the file containing the module (name)
768 mod_searchmodule(char *name, struct mod_depend *verinfo)
770 struct moduledir *mdp;
775 * Now we ready to lookup module in the given directories
778 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
779 result = mod_search_hints(mdp, name, verinfo);
788 file_addmodule(struct preloaded_file *fp, char *modname, int version,
789 struct kernel_module **newmp)
791 struct kernel_module *mp;
792 struct mod_depend mdepend;
794 bzero(&mdepend, sizeof(mdepend));
795 mdepend.md_ver_preferred = version;
796 mp = file_findmodule(fp, modname, &mdepend);
799 mp = malloc(sizeof(struct kernel_module));
802 bzero(mp, sizeof(struct kernel_module));
803 mp->m_name = strdup(modname);
804 mp->m_version = version;
806 mp->m_next = fp->f_modules;
817 file_discard(struct preloaded_file *fp)
819 struct file_metadata *md, *md1;
820 struct kernel_module *mp, *mp1;
837 if (fp->f_name != NULL)
839 if (fp->f_type != NULL)
841 if (fp->f_args != NULL)
847 * Allocate a new file; must be used instead of malloc()
848 * to ensure safe initialisation.
850 struct preloaded_file *
853 struct preloaded_file *fp;
855 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
856 bzero(fp, sizeof(struct preloaded_file));
862 * Add a module to the chain
865 file_insert_tail(struct preloaded_file *fp)
867 struct preloaded_file *cm;
869 /* Append to list of loaded file */
871 if (preloaded_files == NULL) {
872 preloaded_files = fp;
874 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
881 moduledir_fullpath(struct moduledir *mdp, const char *fname)
885 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
888 strcpy(cp, mdp->d_path);
895 * Read linker.hints file into memory performing some sanity checks.
898 moduledir_readhints(struct moduledir *mdp)
902 int fd, size, version;
904 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
906 path = moduledir_fullpath(mdp, "linker.hints");
907 if (rel_stat(path, &st) != 0 || st.st_size < (sizeof(version) + sizeof(int)) ||
908 st.st_size > 100 * 1024 || (fd = rel_open(path, NULL, O_RDONLY)) < 0) {
910 mdp->d_flags |= MDIR_NOHINTS;
914 size = read(fd, &version, sizeof(version));
915 if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
917 size = st.st_size - size;
918 mdp->d_hints = malloc(size);
919 if (mdp->d_hints == NULL)
921 if (read(fd, mdp->d_hints, size) != size)
923 mdp->d_hintsz = size;
932 mdp->d_flags |= MDIR_NOHINTS;
937 * Extract directories from the ';' separated list, remove duplicates.
940 moduledir_rebuild(void)
942 struct moduledir *mdp, *mtmp;
943 const char *path, *cp, *ep;
946 path = getenv("module_path");
948 path = default_searchpath;
950 * Rebuild list of module directories if it changed
952 STAILQ_FOREACH(mdp, &moduledir_list, d_link)
953 mdp->d_flags |= MDIR_REMOVED;
955 for (ep = path; *ep != 0; ep++) {
957 for (; *ep != 0 && *ep != ';'; ep++)
960 * Ignore trailing slashes
962 for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
964 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
965 if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
967 mdp->d_flags &= ~MDIR_REMOVED;
971 mdp = malloc(sizeof(*mdp) + cplen + 1);
974 mdp->d_path = (char*)(mdp + 1);
975 bcopy(cp, mdp->d_path, cplen);
976 mdp->d_path[cplen] = 0;
979 STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
985 * Delete unused directories if any
987 mdp = STAILQ_FIRST(&moduledir_list);
989 if ((mdp->d_flags & MDIR_REMOVED) == 0) {
990 mdp = STAILQ_NEXT(mdp, d_link);
995 mdp = STAILQ_NEXT(mdp, d_link);
996 STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);