2 * Copyright (c) 1997-2000 Doug Rabson
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include "opt_hwpmc_hooks.h"
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
38 #include <sys/sysproto.h>
39 #include <sys/sysent.h>
43 #include <sys/mutex.h>
45 #include <sys/module.h>
46 #include <sys/mount.h>
47 #include <sys/linker.h>
48 #include <sys/eventhandler.h>
49 #include <sys/fcntl.h>
51 #include <sys/libkern.h>
52 #include <sys/namei.h>
53 #include <sys/vnode.h>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysctl.h>
63 #include <security/mac/mac_framework.h>
65 #include "linker_if.h"
68 #include <sys/pmckern.h>
73 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN,
74 &kld_debug, 0, "Set various levels of KLD debug");
77 /* These variables are used by kernel debuggers to enumerate loaded files. */
78 const int kld_off_address = offsetof(struct linker_file, address);
79 const int kld_off_filename = offsetof(struct linker_file, filename);
80 const int kld_off_pathname = offsetof(struct linker_file, pathname);
81 const int kld_off_next = offsetof(struct linker_file, link.tqe_next);
84 * static char *linker_search_path(const char *name, struct mod_depend
87 static const char *linker_basename(const char *path);
90 * Find a currently loaded file given its filename.
92 static linker_file_t linker_find_file_by_name(const char* _filename);
95 * Find a currently loaded file given its file id.
97 static linker_file_t linker_find_file_by_id(int _fileid);
99 /* Metadata from the static kernel */
100 SET_DECLARE(modmetadata_set, struct mod_metadata);
102 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
104 linker_file_t linker_kernel_file;
106 static struct sx kld_sx; /* kernel linker lock */
109 * Load counter used by clients to determine if a linker file has been
110 * re-loaded. This counter is incremented for each file load.
114 static linker_class_list_t classes;
115 static linker_file_list_t linker_files;
116 static int next_file_id = 1;
117 static int linker_no_more_classes = 0;
119 #define LINKER_GET_NEXT_FILE_ID(a) do { \
120 linker_file_t lftmp; \
123 sx_assert(&kld_sx, SA_XLOCKED); \
125 TAILQ_FOREACH(lftmp, &linker_files, link) { \
126 if (next_file_id == lftmp->id) { \
131 (a) = next_file_id; \
135 /* XXX wrong name; we're looking at version provision tags here, not modules */
136 typedef TAILQ_HEAD(, modlist) modlisthead_t;
138 TAILQ_ENTRY(modlist) link; /* chain together all modules */
139 linker_file_t container;
143 typedef struct modlist *modlist_t;
144 static modlisthead_t found_modules;
146 static int linker_file_add_dependency(linker_file_t file,
148 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
149 const char* name, int deps);
150 static int linker_load_module(const char *kldname,
151 const char *modname, struct linker_file *parent,
152 const struct mod_depend *verinfo, struct linker_file **lfpp);
153 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
156 linker_init(void *arg)
159 sx_init(&kld_sx, "kernel linker");
160 TAILQ_INIT(&classes);
161 TAILQ_INIT(&linker_files);
164 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
167 linker_stop_class_add(void *arg)
170 linker_no_more_classes = 1;
173 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
176 linker_add_class(linker_class_t lc)
180 * We disallow any class registration past SI_ORDER_ANY
181 * of SI_SUB_KLD. We bump the reference count to keep the
182 * ops from being freed.
184 if (linker_no_more_classes == 1)
186 kobj_class_compile((kobj_class_t) lc);
187 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
188 TAILQ_INSERT_TAIL(&classes, lc, link);
193 linker_file_sysinit(linker_file_t lf)
195 struct sysinit **start, **stop, **sipp, **xipp, *save;
197 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
200 sx_assert(&kld_sx, SA_XLOCKED);
202 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
205 * Perform a bubble sort of the system initialization objects by
206 * their subsystem (primary key) and order (secondary key).
208 * Since some things care about execution order, this is the operation
209 * which ensures continued function.
211 for (sipp = start; sipp < stop; sipp++) {
212 for (xipp = sipp + 1; xipp < stop; xipp++) {
213 if ((*sipp)->subsystem < (*xipp)->subsystem ||
214 ((*sipp)->subsystem == (*xipp)->subsystem &&
215 (*sipp)->order <= (*xipp)->order))
224 * Traverse the (now) ordered list of system initialization tasks.
225 * Perform each task, and continue on to the next task.
229 for (sipp = start; sipp < stop; sipp++) {
230 if ((*sipp)->subsystem == SI_SUB_DUMMY)
231 continue; /* skip dummy task(s) */
234 (*((*sipp)->func)) ((*sipp)->udata);
241 linker_file_sysuninit(linker_file_t lf)
243 struct sysinit **start, **stop, **sipp, **xipp, *save;
245 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
248 sx_assert(&kld_sx, SA_XLOCKED);
250 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
255 * Perform a reverse bubble sort of the system initialization objects
256 * by their subsystem (primary key) and order (secondary key).
258 * Since some things care about execution order, this is the operation
259 * which ensures continued function.
261 for (sipp = start; sipp < stop; sipp++) {
262 for (xipp = sipp + 1; xipp < stop; xipp++) {
263 if ((*sipp)->subsystem > (*xipp)->subsystem ||
264 ((*sipp)->subsystem == (*xipp)->subsystem &&
265 (*sipp)->order >= (*xipp)->order))
274 * Traverse the (now) ordered list of system initialization tasks.
275 * Perform each task, and continue on to the next task.
279 for (sipp = start; sipp < stop; sipp++) {
280 if ((*sipp)->subsystem == SI_SUB_DUMMY)
281 continue; /* skip dummy task(s) */
284 (*((*sipp)->func)) ((*sipp)->udata);
291 linker_file_register_sysctls(linker_file_t lf, bool enable)
293 struct sysctl_oid **start, **stop, **oidp;
296 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
299 sx_assert(&kld_sx, SA_XLOCKED);
301 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
306 for (oidp = start; oidp < stop; oidp++) {
308 sysctl_register_oid(*oidp);
310 sysctl_register_disabled_oid(*oidp);
317 linker_file_enable_sysctls(linker_file_t lf)
319 struct sysctl_oid **start, **stop, **oidp;
322 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n",
325 sx_assert(&kld_sx, SA_XLOCKED);
327 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
332 for (oidp = start; oidp < stop; oidp++)
333 sysctl_enable_oid(*oidp);
339 linker_file_unregister_sysctls(linker_file_t lf)
341 struct sysctl_oid **start, **stop, **oidp;
343 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
344 " for %s\n", lf->filename));
346 sx_assert(&kld_sx, SA_XLOCKED);
348 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
353 for (oidp = start; oidp < stop; oidp++)
354 sysctl_unregister_oid(*oidp);
360 linker_file_register_modules(linker_file_t lf)
362 struct mod_metadata **start, **stop, **mdp;
363 const moduledata_t *moddata;
364 int first_error, error;
366 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
367 " in %s\n", lf->filename));
369 sx_assert(&kld_sx, SA_XLOCKED);
371 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
374 * This fallback should be unnecessary, but if we get booted
375 * from boot2 instead of loader and we are missing our
376 * metadata then we have to try the best we can.
378 if (lf == linker_kernel_file) {
379 start = SET_BEGIN(modmetadata_set);
380 stop = SET_LIMIT(modmetadata_set);
385 for (mdp = start; mdp < stop; mdp++) {
386 if ((*mdp)->md_type != MDT_MODULE)
388 moddata = (*mdp)->md_data;
389 KLD_DPF(FILE, ("Registering module %s in %s\n",
390 moddata->name, lf->filename));
391 error = module_register(moddata, lf);
393 printf("Module %s failed to register: %d\n",
394 moddata->name, error);
395 if (first_error == 0)
399 return (first_error);
403 linker_init_kernel_modules(void)
407 linker_file_register_modules(linker_kernel_file);
411 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
415 linker_load_file(const char *filename, linker_file_t *result)
419 int foundfile, error, modules;
421 /* Refuse to load modules if securelevel raised */
422 if (prison0.pr_securelevel > 0)
425 sx_assert(&kld_sx, SA_XLOCKED);
426 lf = linker_find_file_by_name(filename);
428 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
429 " incrementing refs\n", filename));
438 * We do not need to protect (lock) classes here because there is
439 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
440 * and there is no class deregistration mechanism at this time.
442 TAILQ_FOREACH(lc, &classes, link) {
443 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
445 error = LINKER_LOAD_FILE(lc, filename, &lf);
447 * If we got something other than ENOENT, then it exists but
448 * we cannot load it for some other reason.
453 error = linker_file_register_modules(lf);
454 if (error == EEXIST) {
455 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
458 modules = !TAILQ_EMPTY(&lf->modules);
459 linker_file_register_sysctls(lf, false);
460 linker_file_sysinit(lf);
461 lf->flags |= LINKER_FILE_LINKED;
464 * If all of the modules in this file failed
465 * to load, unload the file and return an
468 if (modules && TAILQ_EMPTY(&lf->modules)) {
469 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
472 linker_file_enable_sysctls(lf);
473 EVENTHANDLER_INVOKE(kld_load, lf);
479 * Less than ideal, but tells the user whether it failed to load or
480 * the module was not found.
485 * If the file type has not been recognized by the last try
486 * printout a message before to fail.
489 printf("linker_load_file: Unsupported file type\n");
492 * Format not recognized or otherwise unloadable.
493 * When loading a module that is statically built into
494 * the kernel EEXIST percolates back up as the return
495 * value. Preserve this so that apps like sysinstall
496 * can recognize this special case and not post bogus
502 error = ENOENT; /* Nothing found */
507 linker_reference_module(const char *modname, struct mod_depend *verinfo,
508 linker_file_t *result)
514 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
515 *result = mod->container;
521 error = linker_load_module(NULL, modname, NULL, verinfo, result);
527 linker_release_module(const char *modname, struct mod_depend *verinfo,
535 KASSERT(modname != NULL,
536 ("linker_release_module: no file or name"));
537 mod = modlist_lookup2(modname, verinfo);
544 KASSERT(modname == NULL && verinfo == NULL,
545 ("linker_release_module: both file and name"));
546 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
552 linker_find_file_by_name(const char *filename)
557 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
558 sprintf(koname, "%s.ko", filename);
560 sx_assert(&kld_sx, SA_XLOCKED);
561 TAILQ_FOREACH(lf, &linker_files, link) {
562 if (strcmp(lf->filename, koname) == 0)
564 if (strcmp(lf->filename, filename) == 0)
567 free(koname, M_LINKER);
572 linker_find_file_by_id(int fileid)
576 sx_assert(&kld_sx, SA_XLOCKED);
577 TAILQ_FOREACH(lf, &linker_files, link)
578 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
584 linker_file_foreach(linker_predicate_t *predicate, void *context)
590 TAILQ_FOREACH(lf, &linker_files, link) {
591 retval = predicate(lf, context);
600 linker_make_file(const char *pathname, linker_class_t lc)
603 const char *filename;
606 sx_assert(&kld_sx, SA_XLOCKED);
607 filename = linker_basename(pathname);
609 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
610 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
618 lf->filename = strdup(filename, M_LINKER);
619 lf->pathname = strdup(pathname, M_LINKER);
620 LINKER_GET_NEXT_FILE_ID(lf->id);
623 lf->loadcnt = ++loadcnt;
624 STAILQ_INIT(&lf->common);
625 TAILQ_INIT(&lf->modules);
626 TAILQ_INSERT_TAIL(&linker_files, lf, link);
631 linker_file_unload(linker_file_t file, int flags)
634 modlist_t ml, nextml;
635 struct common_symbol *cp;
638 /* Refuse to unload modules if securelevel raised. */
639 if (prison0.pr_securelevel > 0)
642 sx_assert(&kld_sx, SA_XLOCKED);
643 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
645 /* Easy case of just dropping a reference. */
646 if (file->refs > 1) {
651 /* Give eventhandlers a chance to prevent the unload. */
653 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
657 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
658 " informing modules\n"));
661 * Quiesce all the modules to give them a chance to veto the unload.
664 for (mod = TAILQ_FIRST(&file->modules); mod;
665 mod = module_getfnext(mod)) {
667 error = module_quiesce(mod);
668 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
669 KLD_DPF(FILE, ("linker_file_unload: module %s"
670 " vetoed unload\n", module_getname(mod)));
672 * XXX: Do we need to tell all the quiesced modules
673 * that they can resume work now via a new module
683 * Inform any modules associated with this file that they are
687 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
688 next = module_getfnext(mod);
692 * Give the module a chance to veto the unload.
694 if ((error = module_unload(mod)) != 0) {
697 KLD_DPF(FILE, ("linker_file_unload: module %s"
698 " failed unload\n", module_getname(mod)));
708 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
709 if (ml->container == file) {
710 TAILQ_REMOVE(&found_modules, ml, link);
716 * Don't try to run SYSUNINITs if we are unloaded due to a
719 if (file->flags & LINKER_FILE_LINKED) {
720 file->flags &= ~LINKER_FILE_LINKED;
721 linker_file_unregister_sysctls(file);
722 linker_file_sysuninit(file);
724 TAILQ_REMOVE(&linker_files, file, link);
727 for (i = 0; i < file->ndeps; i++)
728 linker_file_unload(file->deps[i], flags);
729 free(file->deps, M_LINKER);
732 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
733 STAILQ_REMOVE_HEAD(&file->common, link);
739 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
742 if (file->filename) {
743 free(file->filename, M_LINKER);
744 file->filename = NULL;
746 if (file->pathname) {
747 free(file->pathname, M_LINKER);
748 file->pathname = NULL;
750 kobj_delete((kobj_t) file, M_LINKER);
755 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
757 return (LINKER_CTF_GET(file, lc));
761 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
763 linker_file_t *newdeps;
765 sx_assert(&kld_sx, SA_XLOCKED);
766 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
767 M_LINKER, M_WAITOK | M_ZERO);
768 file->deps[file->ndeps] = dep;
770 KLD_DPF(FILE, ("linker_file_add_dependency:"
771 " adding %s as dependency for %s\n",
772 dep->filename, file->filename));
777 * Locate a linker set and its contents. This is a helper function to avoid
778 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
779 * This function is used in this file so we can avoid having lots of (void **)
783 linker_file_lookup_set(linker_file_t file, const char *name,
784 void *firstp, void *lastp, int *countp)
787 sx_assert(&kld_sx, SA_LOCKED);
788 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
792 * List all functions in a file.
795 linker_file_function_listall(linker_file_t lf,
796 linker_function_nameval_callback_t callback_func, void *arg)
798 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
802 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
807 locked = sx_xlocked(&kld_sx);
810 sym = linker_file_lookup_symbol_internal(file, name, deps);
817 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
821 linker_symval_t symval;
823 size_t common_size = 0;
826 sx_assert(&kld_sx, SA_XLOCKED);
827 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
830 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
831 LINKER_SYMBOL_VALUES(file, sym, &symval);
832 if (symval.value == 0)
834 * For commons, first look them up in the
835 * dependencies and only allocate space if not found
838 common_size = symval.size;
840 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
841 ".value=%p\n", symval.value));
842 return (symval.value);
846 for (i = 0; i < file->ndeps; i++) {
847 address = linker_file_lookup_symbol_internal(
848 file->deps[i], name, 0);
850 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
851 " deps value=%p\n", address));
856 if (common_size > 0) {
858 * This is a common symbol which was not found in the
859 * dependencies. We maintain a simple common symbol table in
862 struct common_symbol *cp;
864 STAILQ_FOREACH(cp, &file->common, link) {
865 if (strcmp(cp->name, name) == 0) {
866 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
867 " old common value=%p\n", cp->address));
868 return (cp->address);
872 * Round the symbol size up to align.
874 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
875 cp = malloc(sizeof(struct common_symbol)
876 + common_size + strlen(name) + 1, M_LINKER,
878 cp->address = (caddr_t)(cp + 1);
879 cp->name = cp->address + common_size;
880 strcpy(cp->name, name);
881 bzero(cp->address, common_size);
882 STAILQ_INSERT_TAIL(&file->common, cp, link);
884 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
885 " value=%p\n", cp->address));
886 return (cp->address);
888 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
893 * Both DDB and stack(9) rely on the kernel linker to provide forward and
894 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
895 * do this in a lockfree manner. We provide a set of internal helper
896 * routines to perform these operations without locks, and then wrappers that
899 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
903 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
907 TAILQ_FOREACH(lf, &linker_files, link) {
908 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
916 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
919 c_linker_sym_t best, es;
920 u_long diff, bestdiff, off;
923 off = (uintptr_t)value;
925 TAILQ_FOREACH(lf, &linker_files, link) {
926 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
928 if (es != 0 && diff < bestdiff) {
947 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
951 TAILQ_FOREACH(lf, &linker_files, link) {
952 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
959 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
962 linker_symval_t symval;
967 error = linker_debug_search_symbol(value, &sym, offset);
970 error = linker_debug_symbol_values(sym, &symval);
973 strlcpy(buf, symval.name, buflen);
978 * DDB Helpers. DDB has to look across multiple files with their own symbol
979 * tables and string tables.
981 * Note that we do not obey list locking protocols here. We really don't need
982 * DDB to hang because somebody's got the lock held. We'll take the chance
983 * that the files list is inconsistent instead.
987 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
990 return (linker_debug_lookup(symstr, sym));
995 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
998 return (linker_debug_search_symbol(value, sym, diffp));
1002 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1005 return (linker_debug_symbol_values(sym, symval));
1009 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1013 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1017 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1018 * obey locking protocols, and offer a significantly less complex interface.
1021 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1027 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1028 sx_sunlock(&kld_sx);
1036 kern_kldload(struct thread *td, const char *file, int *fileid)
1038 const char *kldname, *modname;
1042 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1045 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1049 * It is possible that kldloaded module will attach a new ifnet,
1050 * so vnet context must be set when this ocurs.
1052 CURVNET_SET(TD_TO_VNET(td));
1055 * If file does not contain a qualified name or any dot in it
1056 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1059 if (strchr(file, '/') || strchr(file, '.')) {
1068 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1070 sx_xunlock(&kld_sx);
1076 sx_xunlock(&kld_sx);
1084 sys_kldload(struct thread *td, struct kldload_args *uap)
1086 char *pathname = NULL;
1089 td->td_retval[0] = -1;
1091 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1092 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1094 error = kern_kldload(td, pathname, &fileid);
1096 td->td_retval[0] = fileid;
1098 free(pathname, M_TEMP);
1103 kern_kldunload(struct thread *td, int fileid, int flags)
1108 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1111 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1114 CURVNET_SET(TD_TO_VNET(td));
1116 lf = linker_find_file_by_id(fileid);
1118 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1120 if (lf->userrefs == 0) {
1122 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1124 printf("kldunload: attempt to unload file that was"
1125 " loaded by the kernel\n");
1129 error = linker_file_unload(lf, flags);
1135 sx_xunlock(&kld_sx);
1142 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1145 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1149 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1152 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1153 uap->flags != LINKER_UNLOAD_FORCE)
1155 return (kern_kldunload(td, uap->fileid, uap->flags));
1159 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1162 const char *filename;
1167 error = mac_kld_check_stat(td->td_ucred);
1172 td->td_retval[0] = -1;
1174 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1175 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1178 filename = linker_basename(pathname);
1180 lf = linker_find_file_by_name(filename);
1182 td->td_retval[0] = lf->id;
1185 sx_xunlock(&kld_sx);
1187 free(pathname, M_TEMP);
1192 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1198 error = mac_kld_check_stat(td->td_ucred);
1204 if (uap->fileid == 0)
1205 lf = TAILQ_FIRST(&linker_files);
1207 lf = linker_find_file_by_id(uap->fileid);
1212 lf = TAILQ_NEXT(lf, link);
1215 /* Skip partially loaded files. */
1216 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1217 lf = TAILQ_NEXT(lf, link);
1220 td->td_retval[0] = lf->id;
1222 td->td_retval[0] = 0;
1224 sx_xunlock(&kld_sx);
1229 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1231 struct kld_file_stat *stat;
1235 * Check the version of the user's structure.
1237 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1240 if (version != sizeof(struct kld_file_stat_1) &&
1241 version != sizeof(struct kld_file_stat))
1244 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1245 error = kern_kldstat(td, uap->fileid, stat);
1247 error = copyout(stat, uap->stat, version);
1253 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1260 error = mac_kld_check_stat(td->td_ucred);
1266 lf = linker_find_file_by_id(fileid);
1268 sx_xunlock(&kld_sx);
1272 /* Version 1 fields: */
1273 namelen = strlen(lf->filename) + 1;
1274 if (namelen > MAXPATHLEN)
1275 namelen = MAXPATHLEN;
1276 bcopy(lf->filename, &stat->name[0], namelen);
1277 stat->refs = lf->refs;
1279 stat->address = lf->address;
1280 stat->size = lf->size;
1281 /* Version 2 fields: */
1282 namelen = strlen(lf->pathname) + 1;
1283 if (namelen > MAXPATHLEN)
1284 namelen = MAXPATHLEN;
1285 bcopy(lf->pathname, &stat->pathname[0], namelen);
1286 sx_xunlock(&kld_sx);
1288 td->td_retval[0] = 0;
1293 DB_COMMAND(kldstat, db_kldstat)
1297 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1298 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1299 #undef POINTER_WIDTH
1300 TAILQ_FOREACH(lf, &linker_files, link) {
1303 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1304 lf->address, lf->size, lf->filename);
1310 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1317 error = mac_kld_check_stat(td->td_ucred);
1323 lf = linker_find_file_by_id(uap->fileid);
1326 mp = TAILQ_FIRST(&lf->modules);
1328 td->td_retval[0] = module_getid(mp);
1330 td->td_retval[0] = 0;
1334 sx_xunlock(&kld_sx);
1339 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1341 char *symstr = NULL;
1343 linker_symval_t symval;
1345 struct kld_sym_lookup lookup;
1349 error = mac_kld_check_stat(td->td_ucred);
1354 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1356 if (lookup.version != sizeof(lookup) ||
1357 uap->cmd != KLDSYM_LOOKUP)
1359 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1360 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1363 if (uap->fileid != 0) {
1364 lf = linker_find_file_by_id(uap->fileid);
1367 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1368 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1369 lookup.symvalue = (uintptr_t) symval.value;
1370 lookup.symsize = symval.size;
1371 error = copyout(&lookup, uap->data, sizeof(lookup));
1375 TAILQ_FOREACH(lf, &linker_files, link) {
1376 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1377 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1378 lookup.symvalue = (uintptr_t)symval.value;
1379 lookup.symsize = symval.size;
1380 error = copyout(&lookup, uap->data,
1388 sx_xunlock(&kld_sx);
1390 free(symstr, M_TEMP);
1395 * Preloaded module support
1399 modlist_lookup(const char *name, int ver)
1403 TAILQ_FOREACH(mod, &found_modules, link) {
1404 if (strcmp(mod->name, name) == 0 &&
1405 (ver == 0 || mod->version == ver))
1412 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1414 modlist_t mod, bestmod;
1417 if (verinfo == NULL)
1418 return (modlist_lookup(name, 0));
1420 TAILQ_FOREACH(mod, &found_modules, link) {
1421 if (strcmp(mod->name, name) != 0)
1424 if (ver == verinfo->md_ver_preferred)
1426 if (ver >= verinfo->md_ver_minimum &&
1427 ver <= verinfo->md_ver_maximum &&
1428 (bestmod == NULL || ver > bestmod->version))
1435 modlist_newmodule(const char *modname, int version, linker_file_t container)
1439 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1441 panic("no memory for module list");
1442 mod->container = container;
1443 mod->name = modname;
1444 mod->version = version;
1445 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1450 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1451 struct mod_metadata **stop, int preload)
1453 struct mod_metadata *mp, **mdp;
1454 const char *modname;
1457 for (mdp = start; mdp < stop; mdp++) {
1459 if (mp->md_type != MDT_VERSION)
1461 modname = mp->md_cval;
1462 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1463 if (modlist_lookup(modname, ver) != NULL) {
1464 printf("module %s already present!\n", modname);
1465 /* XXX what can we do? this is a build error. :-( */
1468 modlist_newmodule(modname, ver, lf);
1473 linker_preload(void *arg)
1476 const char *modname, *nmodname;
1478 linker_file_t lf, nlf;
1481 linker_file_list_t loaded_files;
1482 linker_file_list_t depended_files;
1483 struct mod_metadata *mp, *nmp;
1484 struct mod_metadata **start, **stop, **mdp, **nmdp;
1485 const struct mod_depend *verinfo;
1489 struct sysinit **si_start, **si_stop;
1491 TAILQ_INIT(&loaded_files);
1492 TAILQ_INIT(&depended_files);
1493 TAILQ_INIT(&found_modules);
1498 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1499 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1500 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1501 if (modname == NULL) {
1502 printf("Preloaded module at %p does not have a"
1503 " name!\n", modptr);
1506 if (modtype == NULL) {
1507 printf("Preloaded module at %p does not have a type!\n",
1512 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1515 TAILQ_FOREACH(lc, &classes, link) {
1516 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1522 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1526 * First get a list of stuff in the kernel.
1528 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1530 linker_addmodules(linker_kernel_file, start, stop, 1);
1533 * This is a once-off kinky bubble sort to resolve relocation
1534 * dependency requirements.
1537 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1538 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1541 * First, look to see if we would successfully link with this
1544 resolves = 1; /* unless we know otherwise */
1546 for (mdp = start; mdp < stop; mdp++) {
1548 if (mp->md_type != MDT_DEPEND)
1550 modname = mp->md_cval;
1551 verinfo = mp->md_data;
1552 for (nmdp = start; nmdp < stop; nmdp++) {
1554 if (nmp->md_type != MDT_VERSION)
1556 nmodname = nmp->md_cval;
1557 if (strcmp(modname, nmodname) == 0)
1560 if (nmdp < stop) /* it's a self reference */
1564 * ok, the module isn't here yet, we
1567 if (modlist_lookup2(modname, verinfo) == NULL)
1572 * OK, if we found our modules, we can link. So, "provide"
1573 * the modules inside and add it to the end of the link order
1578 for (mdp = start; mdp < stop; mdp++) {
1580 if (mp->md_type != MDT_VERSION)
1582 modname = mp->md_cval;
1583 nver = ((const struct mod_version *)
1584 mp->md_data)->mv_version;
1585 if (modlist_lookup(modname,
1587 printf("module %s already"
1588 " present!\n", modname);
1589 TAILQ_REMOVE(&loaded_files,
1591 linker_file_unload(lf,
1592 LINKER_UNLOAD_FORCE);
1593 /* we changed tailq next ptr */
1596 modlist_newmodule(modname, nver, lf);
1599 TAILQ_REMOVE(&loaded_files, lf, loaded);
1600 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1602 * Since we provided modules, we need to restart the
1603 * sort so that the previous files that depend on us
1604 * have a chance. Also, we've busted the tailq next
1605 * pointer with the REMOVE.
1612 * At this point, we check to see what could not be resolved..
1614 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1615 TAILQ_REMOVE(&loaded_files, lf, loaded);
1616 printf("KLD file %s is missing dependencies\n", lf->filename);
1617 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1621 * We made it. Finish off the linking in the order we determined.
1623 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1624 if (linker_kernel_file) {
1625 linker_kernel_file->refs++;
1626 error = linker_file_add_dependency(lf,
1627 linker_kernel_file);
1629 panic("cannot add dependency");
1631 lf->userrefs++; /* so we can (try to) kldunload it */
1632 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1635 for (mdp = start; mdp < stop; mdp++) {
1637 if (mp->md_type != MDT_DEPEND)
1639 modname = mp->md_cval;
1640 verinfo = mp->md_data;
1641 mod = modlist_lookup2(modname, verinfo);
1643 printf("KLD file %s - cannot find "
1644 "dependency \"%s\"\n",
1645 lf->filename, modname);
1648 /* Don't count self-dependencies */
1649 if (lf == mod->container)
1651 mod->container->refs++;
1652 error = linker_file_add_dependency(lf,
1655 panic("cannot add dependency");
1659 * Now do relocation etc using the symbol search paths
1660 * established by the dependencies
1662 error = LINKER_LINK_PRELOAD_FINISH(lf);
1664 printf("KLD file %s - could not finalize loading\n",
1668 linker_file_register_modules(lf);
1669 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1670 &si_stop, NULL) == 0)
1671 sysinit_add(si_start, si_stop);
1672 linker_file_register_sysctls(lf, true);
1673 lf->flags |= LINKER_FILE_LINKED;
1676 TAILQ_REMOVE(&depended_files, lf, loaded);
1677 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1679 sx_xunlock(&kld_sx);
1680 /* woohoo! we made it! */
1683 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1686 * Search for a not-loaded module by name.
1688 * Modules may be found in the following locations:
1690 * - preloaded (result is just the module name) - on disk (result is full path
1693 * If the module name is qualified in any way (contains path, etc.) the we
1694 * simply return a copy of it.
1696 * The search path can be manipulated via sysctl. Note that we use the ';'
1697 * character as a separator to be consistent with the bootloader.
1700 static char linker_hintfile[] = "linker.hints";
1701 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1703 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1704 sizeof(linker_path), "module load search path");
1706 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1708 static char *linker_ext_list[] = {
1715 * Check if file actually exists either with or without extension listed in
1716 * the linker_ext_list. (probably should be generic for the rest of the
1720 linker_lookup_file(const char *path, int pathlen, const char *name,
1721 int namelen, struct vattr *vap)
1723 struct nameidata nd;
1724 struct thread *td = curthread; /* XXX */
1725 char *result, **cpp, *sep;
1726 int error, len, extlen, reclen, flags;
1730 for (cpp = linker_ext_list; *cpp; cpp++) {
1735 extlen++; /* trailing '\0' */
1736 sep = (path[pathlen - 1] != '/') ? "/" : "";
1738 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1739 result = malloc(reclen, M_LINKER, M_WAITOK);
1740 for (cpp = linker_ext_list; *cpp; cpp++) {
1741 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1742 namelen, name, *cpp);
1744 * Attempt to open the file, and return the path if
1745 * we succeed and it's a regular file.
1747 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1749 error = vn_open(&nd, &flags, 0, NULL);
1751 NDFREE(&nd, NDF_ONLY_PNBUF);
1752 type = nd.ni_vp->v_type;
1754 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1755 VOP_UNLOCK(nd.ni_vp, 0);
1756 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1761 free(result, M_LINKER);
1765 #define INT_ALIGN(base, ptr) ptr = \
1766 (base) + roundup2((ptr) - (base), sizeof(int))
1769 * Lookup KLD which contains requested module in the "linker.hints" file. If
1770 * version specification is available, then try to find the best KLD.
1771 * Otherwise just find the latest one.
1774 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1775 int modnamelen, const struct mod_depend *verinfo)
1777 struct thread *td = curthread; /* XXX */
1778 struct ucred *cred = td ? td->td_ucred : NULL;
1779 struct nameidata nd;
1780 struct vattr vattr, mattr;
1781 u_char *hints = NULL;
1782 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1783 int error, ival, bestver, *intp, found, flags, clen, blen;
1787 bestver = found = 0;
1789 sep = (path[pathlen - 1] != '/') ? "/" : "";
1790 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1792 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1793 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1796 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1798 error = vn_open(&nd, &flags, 0, NULL);
1801 NDFREE(&nd, NDF_ONLY_PNBUF);
1802 if (nd.ni_vp->v_type != VREG)
1805 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1809 * XXX: we need to limit this number to some reasonable value
1811 if (vattr.va_size > LINKER_HINTS_MAX) {
1812 printf("hints file too large %ld\n", (long)vattr.va_size);
1815 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1816 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1817 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1820 VOP_UNLOCK(nd.ni_vp, 0);
1821 vn_close(nd.ni_vp, FREAD, cred, td);
1824 printf("can't read %zd\n", reclen);
1827 intp = (int *)hints;
1829 if (ival != LINKER_HINTS_VERSION) {
1830 printf("hints file version mismatch %d\n", ival);
1833 bufend = hints + vattr.va_size;
1834 recptr = (u_char *)intp;
1836 while (recptr < bufend && !found) {
1837 intp = (int *)recptr;
1844 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1847 INT_ALIGN(hints, cp);
1851 if (verinfo == NULL ||
1852 ival == verinfo->md_ver_preferred) {
1856 if (ival >= verinfo->md_ver_minimum &&
1857 ival <= verinfo->md_ver_maximum &&
1867 recptr += reclen + sizeof(int);
1870 * Finally check if KLD is in the place
1873 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1875 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1878 * KLD is newer than hints file. What we should do now?
1880 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1881 printf("warning: KLD '%s' is newer than the linker.hints"
1884 free(pathbuf, M_LINKER);
1886 free(hints, M_TEMP);
1887 if (nd.ni_vp != NULL) {
1888 VOP_UNLOCK(nd.ni_vp, 0);
1889 vn_close(nd.ni_vp, FREAD, cred, td);
1892 * If nothing found or hints is absent - fallback to the old
1893 * way by using "kldname[.ko]" as module name.
1895 if (!found && !bestver && result == NULL)
1896 result = linker_lookup_file(path, pathlen, modname,
1902 * Lookup KLD which contains requested module in the all directories.
1905 linker_search_module(const char *modname, int modnamelen,
1906 const struct mod_depend *verinfo)
1908 char *cp, *ep, *result;
1911 * traverse the linker path
1913 for (cp = linker_path; *cp; cp = ep + 1) {
1914 /* find the end of this component */
1915 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1916 result = linker_hints_lookup(cp, ep - cp, modname,
1917 modnamelen, verinfo);
1927 * Search for module in all directories listed in the linker_path.
1930 linker_search_kld(const char *name)
1932 char *cp, *ep, *result;
1935 /* qualified at all? */
1936 if (strchr(name, '/'))
1937 return (strdup(name, M_LINKER));
1939 /* traverse the linker path */
1941 for (ep = linker_path; *ep; ep++) {
1943 /* find the end of this component */
1944 for (; *ep != 0 && *ep != ';'; ep++);
1945 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1953 linker_basename(const char *path)
1955 const char *filename;
1957 filename = strrchr(path, '/');
1958 if (filename == NULL)
1967 * Inform hwpmc about the set of kernel modules currently loaded.
1970 linker_hwpmc_list_objects(void)
1973 struct pmckern_map_in *kobase;
1978 TAILQ_FOREACH(lf, &linker_files, link)
1981 /* Allocate nmappings + 1 entries. */
1982 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1983 M_LINKER, M_WAITOK | M_ZERO);
1985 TAILQ_FOREACH(lf, &linker_files, link) {
1987 /* Save the info for this linker file. */
1988 kobase[i].pm_file = lf->filename;
1989 kobase[i].pm_address = (uintptr_t)lf->address;
1992 sx_sunlock(&kld_sx);
1994 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
1996 /* The last entry of the malloced area comprises of all zeros. */
1997 KASSERT(kobase[i].pm_file == NULL,
1998 ("linker_hwpmc_list_objects: last object not NULL"));
2000 return ((void *)kobase);
2005 * Find a file which contains given module and load it, if "parent" is not
2006 * NULL, register a reference to it.
2009 linker_load_module(const char *kldname, const char *modname,
2010 struct linker_file *parent, const struct mod_depend *verinfo,
2011 struct linker_file **lfpp)
2013 linker_file_t lfdep;
2014 const char *filename;
2018 sx_assert(&kld_sx, SA_XLOCKED);
2019 if (modname == NULL) {
2021 * We have to load KLD
2023 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2025 pathname = linker_search_kld(kldname);
2027 if (modlist_lookup2(modname, verinfo) != NULL)
2029 if (kldname != NULL)
2030 pathname = strdup(kldname, M_LINKER);
2031 else if (rootvnode == NULL)
2035 * Need to find a KLD with required module
2037 pathname = linker_search_module(modname,
2038 strlen(modname), verinfo);
2040 if (pathname == NULL)
2044 * Can't load more than one file with the same basename XXX:
2045 * Actually it should be possible to have multiple KLDs with
2046 * the same basename but different path because they can
2047 * provide different versions of the same modules.
2049 filename = linker_basename(pathname);
2050 if (linker_find_file_by_name(filename))
2053 error = linker_load_file(pathname, &lfdep);
2056 if (modname && verinfo &&
2057 modlist_lookup2(modname, verinfo) == NULL) {
2058 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2063 error = linker_file_add_dependency(parent, lfdep);
2070 free(pathname, M_LINKER);
2075 * This routine is responsible for finding dependencies of userland initiated
2076 * kldload(2)'s of files.
2079 linker_load_dependencies(linker_file_t lf)
2081 linker_file_t lfdep;
2082 struct mod_metadata **start, **stop, **mdp, **nmdp;
2083 struct mod_metadata *mp, *nmp;
2084 const struct mod_depend *verinfo;
2086 const char *modname, *nmodname;
2090 * All files are dependent on /kernel.
2092 sx_assert(&kld_sx, SA_XLOCKED);
2093 if (linker_kernel_file) {
2094 linker_kernel_file->refs++;
2095 error = linker_file_add_dependency(lf, linker_kernel_file);
2099 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2102 for (mdp = start; mdp < stop; mdp++) {
2104 if (mp->md_type != MDT_VERSION)
2106 modname = mp->md_cval;
2107 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2108 mod = modlist_lookup(modname, ver);
2110 printf("interface %s.%d already present in the KLD"
2111 " '%s'!\n", modname, ver,
2112 mod->container->filename);
2117 for (mdp = start; mdp < stop; mdp++) {
2119 if (mp->md_type != MDT_DEPEND)
2121 modname = mp->md_cval;
2122 verinfo = mp->md_data;
2124 for (nmdp = start; nmdp < stop; nmdp++) {
2126 if (nmp->md_type != MDT_VERSION)
2128 nmodname = nmp->md_cval;
2129 if (strcmp(modname, nmodname) == 0)
2132 if (nmdp < stop)/* early exit, it's a self reference */
2134 mod = modlist_lookup2(modname, verinfo);
2135 if (mod) { /* woohoo, it's loaded already */
2136 lfdep = mod->container;
2138 error = linker_file_add_dependency(lf, lfdep);
2143 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2145 printf("KLD %s: depends on %s - not available or"
2146 " version mismatch\n", lf->filename, modname);
2153 linker_addmodules(lf, start, stop, 0);
2158 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2160 struct sysctl_req *req;
2163 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2167 * Export a nul-separated, double-nul-terminated list of all function names
2171 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2177 error = mac_kld_check_stat(req->td->td_ucred);
2181 error = sysctl_wire_old_buffer(req, 0);
2185 TAILQ_FOREACH(lf, &linker_files, link) {
2186 error = LINKER_EACH_FUNCTION_NAME(lf,
2187 sysctl_kern_function_list_iterate, req);
2189 sx_xunlock(&kld_sx);
2193 sx_xunlock(&kld_sx);
2194 return (SYSCTL_OUT(req, "", 1));
2197 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2198 NULL, 0, sysctl_kern_function_list, "", "kernel function list");