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>
59 #include <security/mac/mac_framework.h>
61 #include "linker_if.h"
64 #include <sys/pmckern.h>
69 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN,
70 &kld_debug, 0, "Set various levels of KLD debug");
74 * static char *linker_search_path(const char *name, struct mod_depend
77 static const char *linker_basename(const char *path);
80 * Find a currently loaded file given its filename.
82 static linker_file_t linker_find_file_by_name(const char* _filename);
85 * Find a currently loaded file given its file id.
87 static linker_file_t linker_find_file_by_id(int _fileid);
89 /* Metadata from the static kernel */
90 SET_DECLARE(modmetadata_set, struct mod_metadata);
92 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
94 linker_file_t linker_kernel_file;
96 static struct sx kld_sx; /* kernel linker lock */
99 * Load counter used by clients to determine if a linker file has been
100 * re-loaded. This counter is incremented for each file load.
104 static linker_class_list_t classes;
105 static linker_file_list_t linker_files;
106 static int next_file_id = 1;
107 static int linker_no_more_classes = 0;
109 #define LINKER_GET_NEXT_FILE_ID(a) do { \
110 linker_file_t lftmp; \
113 sx_assert(&kld_sx, SA_XLOCKED); \
115 TAILQ_FOREACH(lftmp, &linker_files, link) { \
116 if (next_file_id == lftmp->id) { \
121 (a) = next_file_id; \
125 /* XXX wrong name; we're looking at version provision tags here, not modules */
126 typedef TAILQ_HEAD(, modlist) modlisthead_t;
128 TAILQ_ENTRY(modlist) link; /* chain together all modules */
129 linker_file_t container;
133 typedef struct modlist *modlist_t;
134 static modlisthead_t found_modules;
136 static int linker_file_add_dependency(linker_file_t file,
138 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
139 const char* name, int deps);
140 static int linker_load_module(const char *kldname,
141 const char *modname, struct linker_file *parent,
142 const struct mod_depend *verinfo, struct linker_file **lfpp);
143 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
146 linker_init(void *arg)
149 sx_init(&kld_sx, "kernel linker");
150 TAILQ_INIT(&classes);
151 TAILQ_INIT(&linker_files);
154 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
157 linker_stop_class_add(void *arg)
160 linker_no_more_classes = 1;
163 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
166 linker_add_class(linker_class_t lc)
170 * We disallow any class registration past SI_ORDER_ANY
171 * of SI_SUB_KLD. We bump the reference count to keep the
172 * ops from being freed.
174 if (linker_no_more_classes == 1)
176 kobj_class_compile((kobj_class_t) lc);
177 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
178 TAILQ_INSERT_TAIL(&classes, lc, link);
183 linker_file_sysinit(linker_file_t lf)
185 struct sysinit **start, **stop, **sipp, **xipp, *save;
187 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
190 sx_assert(&kld_sx, SA_XLOCKED);
192 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
195 * Perform a bubble sort of the system initialization objects by
196 * their subsystem (primary key) and order (secondary key).
198 * Since some things care about execution order, this is the operation
199 * which ensures continued function.
201 for (sipp = start; sipp < stop; sipp++) {
202 for (xipp = sipp + 1; xipp < stop; xipp++) {
203 if ((*sipp)->subsystem < (*xipp)->subsystem ||
204 ((*sipp)->subsystem == (*xipp)->subsystem &&
205 (*sipp)->order <= (*xipp)->order))
214 * Traverse the (now) ordered list of system initialization tasks.
215 * Perform each task, and continue on to the next task.
219 for (sipp = start; sipp < stop; sipp++) {
220 if ((*sipp)->subsystem == SI_SUB_DUMMY)
221 continue; /* skip dummy task(s) */
224 (*((*sipp)->func)) ((*sipp)->udata);
231 linker_file_sysuninit(linker_file_t lf)
233 struct sysinit **start, **stop, **sipp, **xipp, *save;
235 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
238 sx_assert(&kld_sx, SA_XLOCKED);
240 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
245 * Perform a reverse bubble sort of the system initialization objects
246 * by their subsystem (primary key) and order (secondary key).
248 * Since some things care about execution order, this is the operation
249 * which ensures continued function.
251 for (sipp = start; sipp < stop; sipp++) {
252 for (xipp = sipp + 1; xipp < stop; xipp++) {
253 if ((*sipp)->subsystem > (*xipp)->subsystem ||
254 ((*sipp)->subsystem == (*xipp)->subsystem &&
255 (*sipp)->order >= (*xipp)->order))
264 * Traverse the (now) ordered list of system initialization tasks.
265 * Perform each task, and continue on to the next task.
269 for (sipp = start; sipp < stop; sipp++) {
270 if ((*sipp)->subsystem == SI_SUB_DUMMY)
271 continue; /* skip dummy task(s) */
274 (*((*sipp)->func)) ((*sipp)->udata);
281 linker_file_register_sysctls(linker_file_t lf)
283 struct sysctl_oid **start, **stop, **oidp;
286 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
289 sx_assert(&kld_sx, SA_XLOCKED);
291 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
296 for (oidp = start; oidp < stop; oidp++)
297 sysctl_register_oid(*oidp);
303 linker_file_unregister_sysctls(linker_file_t lf)
305 struct sysctl_oid **start, **stop, **oidp;
307 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
308 " for %s\n", lf->filename));
310 sx_assert(&kld_sx, SA_XLOCKED);
312 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
317 for (oidp = start; oidp < stop; oidp++)
318 sysctl_unregister_oid(*oidp);
324 linker_file_register_modules(linker_file_t lf)
326 struct mod_metadata **start, **stop, **mdp;
327 const moduledata_t *moddata;
328 int first_error, error;
330 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
331 " in %s\n", lf->filename));
333 sx_assert(&kld_sx, SA_XLOCKED);
335 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
338 * This fallback should be unnecessary, but if we get booted
339 * from boot2 instead of loader and we are missing our
340 * metadata then we have to try the best we can.
342 if (lf == linker_kernel_file) {
343 start = SET_BEGIN(modmetadata_set);
344 stop = SET_LIMIT(modmetadata_set);
349 for (mdp = start; mdp < stop; mdp++) {
350 if ((*mdp)->md_type != MDT_MODULE)
352 moddata = (*mdp)->md_data;
353 KLD_DPF(FILE, ("Registering module %s in %s\n",
354 moddata->name, lf->filename));
355 error = module_register(moddata, lf);
357 printf("Module %s failed to register: %d\n",
358 moddata->name, error);
359 if (first_error == 0)
363 return (first_error);
367 linker_init_kernel_modules(void)
371 linker_file_register_modules(linker_kernel_file);
375 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
379 linker_load_file(const char *filename, linker_file_t *result)
383 int foundfile, error, modules;
385 /* Refuse to load modules if securelevel raised */
386 if (prison0.pr_securelevel > 0)
389 sx_assert(&kld_sx, SA_XLOCKED);
390 lf = linker_find_file_by_name(filename);
392 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
393 " incrementing refs\n", filename));
402 * We do not need to protect (lock) classes here because there is
403 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
404 * and there is no class deregistration mechanism at this time.
406 TAILQ_FOREACH(lc, &classes, link) {
407 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
409 error = LINKER_LOAD_FILE(lc, filename, &lf);
411 * If we got something other than ENOENT, then it exists but
412 * we cannot load it for some other reason.
417 error = linker_file_register_modules(lf);
418 if (error == EEXIST) {
419 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
422 modules = !TAILQ_EMPTY(&lf->modules);
423 linker_file_register_sysctls(lf);
424 linker_file_sysinit(lf);
425 lf->flags |= LINKER_FILE_LINKED;
428 * If all of the modules in this file failed
429 * to load, unload the file and return an
432 if (modules && TAILQ_EMPTY(&lf->modules)) {
433 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
436 EVENTHANDLER_INVOKE(kld_load, lf);
442 * Less than ideal, but tells the user whether it failed to load or
443 * the module was not found.
448 * If the file type has not been recognized by the last try
449 * printout a message before to fail.
452 printf("linker_load_file: Unsupported file type\n");
455 * Format not recognized or otherwise unloadable.
456 * When loading a module that is statically built into
457 * the kernel EEXIST percolates back up as the return
458 * value. Preserve this so that apps like sysinstall
459 * can recognize this special case and not post bogus
465 error = ENOENT; /* Nothing found */
470 linker_reference_module(const char *modname, struct mod_depend *verinfo,
471 linker_file_t *result)
477 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
478 *result = mod->container;
484 error = linker_load_module(NULL, modname, NULL, verinfo, result);
490 linker_release_module(const char *modname, struct mod_depend *verinfo,
498 KASSERT(modname != NULL,
499 ("linker_release_module: no file or name"));
500 mod = modlist_lookup2(modname, verinfo);
507 KASSERT(modname == NULL && verinfo == NULL,
508 ("linker_release_module: both file and name"));
509 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
515 linker_find_file_by_name(const char *filename)
520 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
521 sprintf(koname, "%s.ko", filename);
523 sx_assert(&kld_sx, SA_XLOCKED);
524 TAILQ_FOREACH(lf, &linker_files, link) {
525 if (strcmp(lf->filename, koname) == 0)
527 if (strcmp(lf->filename, filename) == 0)
530 free(koname, M_LINKER);
535 linker_find_file_by_id(int fileid)
539 sx_assert(&kld_sx, SA_XLOCKED);
540 TAILQ_FOREACH(lf, &linker_files, link)
541 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
547 linker_file_foreach(linker_predicate_t *predicate, void *context)
553 TAILQ_FOREACH(lf, &linker_files, link) {
554 retval = predicate(lf, context);
563 linker_make_file(const char *pathname, linker_class_t lc)
566 const char *filename;
569 sx_assert(&kld_sx, SA_XLOCKED);
570 filename = linker_basename(pathname);
572 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
573 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
581 lf->filename = strdup(filename, M_LINKER);
582 lf->pathname = strdup(pathname, M_LINKER);
583 LINKER_GET_NEXT_FILE_ID(lf->id);
586 lf->loadcnt = ++loadcnt;
587 STAILQ_INIT(&lf->common);
588 TAILQ_INIT(&lf->modules);
589 TAILQ_INSERT_TAIL(&linker_files, lf, link);
594 linker_file_unload(linker_file_t file, int flags)
597 modlist_t ml, nextml;
598 struct common_symbol *cp;
601 /* Refuse to unload modules if securelevel raised. */
602 if (prison0.pr_securelevel > 0)
605 sx_assert(&kld_sx, SA_XLOCKED);
606 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
608 /* Easy case of just dropping a reference. */
609 if (file->refs > 1) {
614 /* Give eventhandlers a chance to prevent the unload. */
616 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
620 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
621 " informing modules\n"));
624 * Quiesce all the modules to give them a chance to veto the unload.
627 for (mod = TAILQ_FIRST(&file->modules); mod;
628 mod = module_getfnext(mod)) {
630 error = module_quiesce(mod);
631 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
632 KLD_DPF(FILE, ("linker_file_unload: module %s"
633 " vetoed unload\n", module_getname(mod)));
635 * XXX: Do we need to tell all the quiesced modules
636 * that they can resume work now via a new module
646 * Inform any modules associated with this file that they are
650 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
651 next = module_getfnext(mod);
655 * Give the module a chance to veto the unload.
657 if ((error = module_unload(mod)) != 0) {
660 KLD_DPF(FILE, ("linker_file_unload: module %s"
661 " failed unload\n", module_getname(mod)));
671 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
672 if (ml->container == file) {
673 TAILQ_REMOVE(&found_modules, ml, link);
679 * Don't try to run SYSUNINITs if we are unloaded due to a
682 if (file->flags & LINKER_FILE_LINKED) {
683 file->flags &= ~LINKER_FILE_LINKED;
684 linker_file_sysuninit(file);
685 linker_file_unregister_sysctls(file);
687 TAILQ_REMOVE(&linker_files, file, link);
690 for (i = 0; i < file->ndeps; i++)
691 linker_file_unload(file->deps[i], flags);
692 free(file->deps, M_LINKER);
695 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
696 STAILQ_REMOVE_HEAD(&file->common, link);
702 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
705 if (file->filename) {
706 free(file->filename, M_LINKER);
707 file->filename = NULL;
709 if (file->pathname) {
710 free(file->pathname, M_LINKER);
711 file->pathname = NULL;
713 kobj_delete((kobj_t) file, M_LINKER);
718 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
720 return (LINKER_CTF_GET(file, lc));
724 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
726 linker_file_t *newdeps;
728 sx_assert(&kld_sx, SA_XLOCKED);
729 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
730 M_LINKER, M_WAITOK | M_ZERO);
731 file->deps[file->ndeps] = dep;
733 KLD_DPF(FILE, ("linker_file_add_dependency:"
734 " adding %s as dependency for %s\n",
735 dep->filename, file->filename));
740 * Locate a linker set and its contents. This is a helper function to avoid
741 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
742 * This function is used in this file so we can avoid having lots of (void **)
746 linker_file_lookup_set(linker_file_t file, const char *name,
747 void *firstp, void *lastp, int *countp)
750 sx_assert(&kld_sx, SA_LOCKED);
751 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
755 * List all functions in a file.
758 linker_file_function_listall(linker_file_t lf,
759 linker_function_nameval_callback_t callback_func, void *arg)
761 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
765 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
770 locked = sx_xlocked(&kld_sx);
773 sym = linker_file_lookup_symbol_internal(file, name, deps);
780 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
784 linker_symval_t symval;
786 size_t common_size = 0;
789 sx_assert(&kld_sx, SA_XLOCKED);
790 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
793 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
794 LINKER_SYMBOL_VALUES(file, sym, &symval);
795 if (symval.value == 0)
797 * For commons, first look them up in the
798 * dependencies and only allocate space if not found
801 common_size = symval.size;
803 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
804 ".value=%p\n", symval.value));
805 return (symval.value);
809 for (i = 0; i < file->ndeps; i++) {
810 address = linker_file_lookup_symbol_internal(
811 file->deps[i], name, 0);
813 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
814 " deps value=%p\n", address));
819 if (common_size > 0) {
821 * This is a common symbol which was not found in the
822 * dependencies. We maintain a simple common symbol table in
825 struct common_symbol *cp;
827 STAILQ_FOREACH(cp, &file->common, link) {
828 if (strcmp(cp->name, name) == 0) {
829 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
830 " old common value=%p\n", cp->address));
831 return (cp->address);
835 * Round the symbol size up to align.
837 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
838 cp = malloc(sizeof(struct common_symbol)
839 + common_size + strlen(name) + 1, M_LINKER,
841 cp->address = (caddr_t)(cp + 1);
842 cp->name = cp->address + common_size;
843 strcpy(cp->name, name);
844 bzero(cp->address, common_size);
845 STAILQ_INSERT_TAIL(&file->common, cp, link);
847 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
848 " value=%p\n", cp->address));
849 return (cp->address);
851 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
856 * Both DDB and stack(9) rely on the kernel linker to provide forward and
857 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
858 * do this in a lockfree manner. We provide a set of internal helper
859 * routines to perform these operations without locks, and then wrappers that
862 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
866 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
870 TAILQ_FOREACH(lf, &linker_files, link) {
871 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
879 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
882 c_linker_sym_t best, es;
883 u_long diff, bestdiff, off;
886 off = (uintptr_t)value;
888 TAILQ_FOREACH(lf, &linker_files, link) {
889 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
891 if (es != 0 && diff < bestdiff) {
910 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
914 TAILQ_FOREACH(lf, &linker_files, link) {
915 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
922 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
925 linker_symval_t symval;
930 error = linker_debug_search_symbol(value, &sym, offset);
933 error = linker_debug_symbol_values(sym, &symval);
936 strlcpy(buf, symval.name, buflen);
941 * DDB Helpers. DDB has to look across multiple files with their own symbol
942 * tables and string tables.
944 * Note that we do not obey list locking protocols here. We really don't need
945 * DDB to hang because somebody's got the lock held. We'll take the chance
946 * that the files list is inconsistant instead.
950 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
953 return (linker_debug_lookup(symstr, sym));
958 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
961 return (linker_debug_search_symbol(value, sym, diffp));
965 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
968 return (linker_debug_symbol_values(sym, symval));
972 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
976 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
980 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
981 * obey locking protocols, and offer a significantly less complex interface.
984 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
990 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
999 kern_kldload(struct thread *td, const char *file, int *fileid)
1001 const char *kldname, *modname;
1005 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1008 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1012 * It is possible that kldloaded module will attach a new ifnet,
1013 * so vnet context must be set when this ocurs.
1015 CURVNET_SET(TD_TO_VNET(td));
1018 * If file does not contain a qualified name or any dot in it
1019 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1022 if (strchr(file, '/') || strchr(file, '.')) {
1031 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1033 sx_xunlock(&kld_sx);
1039 sx_xunlock(&kld_sx);
1047 sys_kldload(struct thread *td, struct kldload_args *uap)
1049 char *pathname = NULL;
1052 td->td_retval[0] = -1;
1054 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1055 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1057 error = kern_kldload(td, pathname, &fileid);
1059 td->td_retval[0] = fileid;
1061 free(pathname, M_TEMP);
1066 kern_kldunload(struct thread *td, int fileid, int flags)
1071 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1074 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1077 CURVNET_SET(TD_TO_VNET(td));
1079 lf = linker_find_file_by_id(fileid);
1081 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1083 if (lf->userrefs == 0) {
1085 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1087 printf("kldunload: attempt to unload file that was"
1088 " loaded by the kernel\n");
1092 error = linker_file_unload(lf, flags);
1098 sx_xunlock(&kld_sx);
1105 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1108 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1112 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1115 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1116 uap->flags != LINKER_UNLOAD_FORCE)
1118 return (kern_kldunload(td, uap->fileid, uap->flags));
1122 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1125 const char *filename;
1130 error = mac_kld_check_stat(td->td_ucred);
1135 td->td_retval[0] = -1;
1137 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1138 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1141 filename = linker_basename(pathname);
1143 lf = linker_find_file_by_name(filename);
1145 td->td_retval[0] = lf->id;
1148 sx_xunlock(&kld_sx);
1150 free(pathname, M_TEMP);
1155 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1161 error = mac_kld_check_stat(td->td_ucred);
1167 if (uap->fileid == 0)
1168 lf = TAILQ_FIRST(&linker_files);
1170 lf = linker_find_file_by_id(uap->fileid);
1175 lf = TAILQ_NEXT(lf, link);
1178 /* Skip partially loaded files. */
1179 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1180 lf = TAILQ_NEXT(lf, link);
1183 td->td_retval[0] = lf->id;
1185 td->td_retval[0] = 0;
1187 sx_xunlock(&kld_sx);
1192 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1194 struct kld_file_stat stat;
1198 * Check the version of the user's structure.
1200 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1203 if (version != sizeof(struct kld_file_stat_1) &&
1204 version != sizeof(struct kld_file_stat))
1207 error = kern_kldstat(td, uap->fileid, &stat);
1210 return (copyout(&stat, uap->stat, version));
1214 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1221 error = mac_kld_check_stat(td->td_ucred);
1227 lf = linker_find_file_by_id(fileid);
1229 sx_xunlock(&kld_sx);
1233 /* Version 1 fields: */
1234 namelen = strlen(lf->filename) + 1;
1235 if (namelen > MAXPATHLEN)
1236 namelen = MAXPATHLEN;
1237 bcopy(lf->filename, &stat->name[0], namelen);
1238 stat->refs = lf->refs;
1240 stat->address = lf->address;
1241 stat->size = lf->size;
1242 /* Version 2 fields: */
1243 namelen = strlen(lf->pathname) + 1;
1244 if (namelen > MAXPATHLEN)
1245 namelen = MAXPATHLEN;
1246 bcopy(lf->pathname, &stat->pathname[0], namelen);
1247 sx_xunlock(&kld_sx);
1249 td->td_retval[0] = 0;
1254 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1261 error = mac_kld_check_stat(td->td_ucred);
1267 lf = linker_find_file_by_id(uap->fileid);
1270 mp = TAILQ_FIRST(&lf->modules);
1272 td->td_retval[0] = module_getid(mp);
1274 td->td_retval[0] = 0;
1278 sx_xunlock(&kld_sx);
1283 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1285 char *symstr = NULL;
1287 linker_symval_t symval;
1289 struct kld_sym_lookup lookup;
1293 error = mac_kld_check_stat(td->td_ucred);
1298 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1300 if (lookup.version != sizeof(lookup) ||
1301 uap->cmd != KLDSYM_LOOKUP)
1303 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1304 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1307 if (uap->fileid != 0) {
1308 lf = linker_find_file_by_id(uap->fileid);
1311 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1312 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1313 lookup.symvalue = (uintptr_t) symval.value;
1314 lookup.symsize = symval.size;
1315 error = copyout(&lookup, uap->data, sizeof(lookup));
1319 TAILQ_FOREACH(lf, &linker_files, link) {
1320 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1321 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1322 lookup.symvalue = (uintptr_t)symval.value;
1323 lookup.symsize = symval.size;
1324 error = copyout(&lookup, uap->data,
1332 sx_xunlock(&kld_sx);
1334 free(symstr, M_TEMP);
1339 * Preloaded module support
1343 modlist_lookup(const char *name, int ver)
1347 TAILQ_FOREACH(mod, &found_modules, link) {
1348 if (strcmp(mod->name, name) == 0 &&
1349 (ver == 0 || mod->version == ver))
1356 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1358 modlist_t mod, bestmod;
1361 if (verinfo == NULL)
1362 return (modlist_lookup(name, 0));
1364 TAILQ_FOREACH(mod, &found_modules, link) {
1365 if (strcmp(mod->name, name) != 0)
1368 if (ver == verinfo->md_ver_preferred)
1370 if (ver >= verinfo->md_ver_minimum &&
1371 ver <= verinfo->md_ver_maximum &&
1372 (bestmod == NULL || ver > bestmod->version))
1379 modlist_newmodule(const char *modname, int version, linker_file_t container)
1383 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1385 panic("no memory for module list");
1386 mod->container = container;
1387 mod->name = modname;
1388 mod->version = version;
1389 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1394 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1395 struct mod_metadata **stop, int preload)
1397 struct mod_metadata *mp, **mdp;
1398 const char *modname;
1401 for (mdp = start; mdp < stop; mdp++) {
1403 if (mp->md_type != MDT_VERSION)
1405 modname = mp->md_cval;
1406 ver = ((struct mod_version *)mp->md_data)->mv_version;
1407 if (modlist_lookup(modname, ver) != NULL) {
1408 printf("module %s already present!\n", modname);
1409 /* XXX what can we do? this is a build error. :-( */
1412 modlist_newmodule(modname, ver, lf);
1417 linker_preload(void *arg)
1420 const char *modname, *nmodname;
1422 linker_file_t lf, nlf;
1425 linker_file_list_t loaded_files;
1426 linker_file_list_t depended_files;
1427 struct mod_metadata *mp, *nmp;
1428 struct mod_metadata **start, **stop, **mdp, **nmdp;
1429 const struct mod_depend *verinfo;
1433 struct sysinit **si_start, **si_stop;
1435 TAILQ_INIT(&loaded_files);
1436 TAILQ_INIT(&depended_files);
1437 TAILQ_INIT(&found_modules);
1442 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1443 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1444 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1445 if (modname == NULL) {
1446 printf("Preloaded module at %p does not have a"
1447 " name!\n", modptr);
1450 if (modtype == NULL) {
1451 printf("Preloaded module at %p does not have a type!\n",
1456 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1459 TAILQ_FOREACH(lc, &classes, link) {
1460 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1466 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1470 * First get a list of stuff in the kernel.
1472 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1474 linker_addmodules(linker_kernel_file, start, stop, 1);
1477 * This is a once-off kinky bubble sort to resolve relocation
1478 * dependency requirements.
1481 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1482 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1485 * First, look to see if we would successfully link with this
1488 resolves = 1; /* unless we know otherwise */
1490 for (mdp = start; mdp < stop; mdp++) {
1492 if (mp->md_type != MDT_DEPEND)
1494 modname = mp->md_cval;
1495 verinfo = mp->md_data;
1496 for (nmdp = start; nmdp < stop; nmdp++) {
1498 if (nmp->md_type != MDT_VERSION)
1500 nmodname = nmp->md_cval;
1501 if (strcmp(modname, nmodname) == 0)
1504 if (nmdp < stop) /* it's a self reference */
1508 * ok, the module isn't here yet, we
1511 if (modlist_lookup2(modname, verinfo) == NULL)
1516 * OK, if we found our modules, we can link. So, "provide"
1517 * the modules inside and add it to the end of the link order
1522 for (mdp = start; mdp < stop; mdp++) {
1524 if (mp->md_type != MDT_VERSION)
1526 modname = mp->md_cval;
1527 nver = ((struct mod_version *)
1528 mp->md_data)->mv_version;
1529 if (modlist_lookup(modname,
1531 printf("module %s already"
1532 " present!\n", modname);
1533 TAILQ_REMOVE(&loaded_files,
1535 linker_file_unload(lf,
1536 LINKER_UNLOAD_FORCE);
1537 /* we changed tailq next ptr */
1540 modlist_newmodule(modname, nver, lf);
1543 TAILQ_REMOVE(&loaded_files, lf, loaded);
1544 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1546 * Since we provided modules, we need to restart the
1547 * sort so that the previous files that depend on us
1548 * have a chance. Also, we've busted the tailq next
1549 * pointer with the REMOVE.
1556 * At this point, we check to see what could not be resolved..
1558 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1559 TAILQ_REMOVE(&loaded_files, lf, loaded);
1560 printf("KLD file %s is missing dependencies\n", lf->filename);
1561 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1565 * We made it. Finish off the linking in the order we determined.
1567 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1568 if (linker_kernel_file) {
1569 linker_kernel_file->refs++;
1570 error = linker_file_add_dependency(lf,
1571 linker_kernel_file);
1573 panic("cannot add dependency");
1575 lf->userrefs++; /* so we can (try to) kldunload it */
1576 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1579 for (mdp = start; mdp < stop; mdp++) {
1581 if (mp->md_type != MDT_DEPEND)
1583 modname = mp->md_cval;
1584 verinfo = mp->md_data;
1585 mod = modlist_lookup2(modname, verinfo);
1587 printf("KLD file %s - cannot find "
1588 "dependency \"%s\"\n",
1589 lf->filename, modname);
1592 /* Don't count self-dependencies */
1593 if (lf == mod->container)
1595 mod->container->refs++;
1596 error = linker_file_add_dependency(lf,
1599 panic("cannot add dependency");
1603 * Now do relocation etc using the symbol search paths
1604 * established by the dependencies
1606 error = LINKER_LINK_PRELOAD_FINISH(lf);
1608 printf("KLD file %s - could not finalize loading\n",
1612 linker_file_register_modules(lf);
1613 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1614 &si_stop, NULL) == 0)
1615 sysinit_add(si_start, si_stop);
1616 linker_file_register_sysctls(lf);
1617 lf->flags |= LINKER_FILE_LINKED;
1620 TAILQ_REMOVE(&depended_files, lf, loaded);
1621 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1623 sx_xunlock(&kld_sx);
1624 /* woohoo! we made it! */
1627 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1630 * Search for a not-loaded module by name.
1632 * Modules may be found in the following locations:
1634 * - preloaded (result is just the module name) - on disk (result is full path
1637 * If the module name is qualified in any way (contains path, etc.) the we
1638 * simply return a copy of it.
1640 * The search path can be manipulated via sysctl. Note that we use the ';'
1641 * character as a separator to be consistent with the bootloader.
1644 static char linker_hintfile[] = "linker.hints";
1645 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1647 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1648 sizeof(linker_path), "module load search path");
1650 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1652 static char *linker_ext_list[] = {
1659 * Check if file actually exists either with or without extension listed in
1660 * the linker_ext_list. (probably should be generic for the rest of the
1664 linker_lookup_file(const char *path, int pathlen, const char *name,
1665 int namelen, struct vattr *vap)
1667 struct nameidata nd;
1668 struct thread *td = curthread; /* XXX */
1669 char *result, **cpp, *sep;
1670 int error, len, extlen, reclen, flags;
1674 for (cpp = linker_ext_list; *cpp; cpp++) {
1679 extlen++; /* trailing '\0' */
1680 sep = (path[pathlen - 1] != '/') ? "/" : "";
1682 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1683 result = malloc(reclen, M_LINKER, M_WAITOK);
1684 for (cpp = linker_ext_list; *cpp; cpp++) {
1685 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1686 namelen, name, *cpp);
1688 * Attempt to open the file, and return the path if
1689 * we succeed and it's a regular file.
1691 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1693 error = vn_open(&nd, &flags, 0, NULL);
1695 NDFREE(&nd, NDF_ONLY_PNBUF);
1696 type = nd.ni_vp->v_type;
1698 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1699 VOP_UNLOCK(nd.ni_vp, 0);
1700 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1705 free(result, M_LINKER);
1709 #define INT_ALIGN(base, ptr) ptr = \
1710 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
1713 * Lookup KLD which contains requested module in the "linker.hints" file. If
1714 * version specification is available, then try to find the best KLD.
1715 * Otherwise just find the latest one.
1718 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1719 int modnamelen, const struct mod_depend *verinfo)
1721 struct thread *td = curthread; /* XXX */
1722 struct ucred *cred = td ? td->td_ucred : NULL;
1723 struct nameidata nd;
1724 struct vattr vattr, mattr;
1725 u_char *hints = NULL;
1726 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1727 int error, ival, bestver, *intp, found, flags, clen, blen;
1731 bestver = found = 0;
1733 sep = (path[pathlen - 1] != '/') ? "/" : "";
1734 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1736 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1737 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1740 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1742 error = vn_open(&nd, &flags, 0, NULL);
1745 NDFREE(&nd, NDF_ONLY_PNBUF);
1746 if (nd.ni_vp->v_type != VREG)
1749 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1753 * XXX: we need to limit this number to some reasonable value
1755 if (vattr.va_size > LINKER_HINTS_MAX) {
1756 printf("hints file too large %ld\n", (long)vattr.va_size);
1759 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1762 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1763 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1766 VOP_UNLOCK(nd.ni_vp, 0);
1767 vn_close(nd.ni_vp, FREAD, cred, td);
1770 printf("can't read %zd\n", reclen);
1773 intp = (int *)hints;
1775 if (ival != LINKER_HINTS_VERSION) {
1776 printf("hints file version mismatch %d\n", ival);
1779 bufend = hints + vattr.va_size;
1780 recptr = (u_char *)intp;
1782 while (recptr < bufend && !found) {
1783 intp = (int *)recptr;
1790 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1793 INT_ALIGN(hints, cp);
1797 if (verinfo == NULL ||
1798 ival == verinfo->md_ver_preferred) {
1802 if (ival >= verinfo->md_ver_minimum &&
1803 ival <= verinfo->md_ver_maximum &&
1813 recptr += reclen + sizeof(int);
1816 * Finally check if KLD is in the place
1819 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1821 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1824 * KLD is newer than hints file. What we should do now?
1826 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1827 printf("warning: KLD '%s' is newer than the linker.hints"
1830 free(pathbuf, M_LINKER);
1832 free(hints, M_TEMP);
1833 if (nd.ni_vp != NULL) {
1834 VOP_UNLOCK(nd.ni_vp, 0);
1835 vn_close(nd.ni_vp, FREAD, cred, td);
1838 * If nothing found or hints is absent - fallback to the old
1839 * way by using "kldname[.ko]" as module name.
1841 if (!found && !bestver && result == NULL)
1842 result = linker_lookup_file(path, pathlen, modname,
1848 * Lookup KLD which contains requested module in the all directories.
1851 linker_search_module(const char *modname, int modnamelen,
1852 const struct mod_depend *verinfo)
1854 char *cp, *ep, *result;
1857 * traverse the linker path
1859 for (cp = linker_path; *cp; cp = ep + 1) {
1860 /* find the end of this component */
1861 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1862 result = linker_hints_lookup(cp, ep - cp, modname,
1863 modnamelen, verinfo);
1873 * Search for module in all directories listed in the linker_path.
1876 linker_search_kld(const char *name)
1878 char *cp, *ep, *result;
1881 /* qualified at all? */
1882 if (strchr(name, '/'))
1883 return (strdup(name, M_LINKER));
1885 /* traverse the linker path */
1887 for (ep = linker_path; *ep; ep++) {
1889 /* find the end of this component */
1890 for (; *ep != 0 && *ep != ';'; ep++);
1891 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1899 linker_basename(const char *path)
1901 const char *filename;
1903 filename = strrchr(path, '/');
1904 if (filename == NULL)
1913 * Inform hwpmc about the set of kernel modules currently loaded.
1916 linker_hwpmc_list_objects(void)
1919 struct pmckern_map_in *kobase;
1924 TAILQ_FOREACH(lf, &linker_files, link)
1927 /* Allocate nmappings + 1 entries. */
1928 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1929 M_LINKER, M_WAITOK | M_ZERO);
1931 TAILQ_FOREACH(lf, &linker_files, link) {
1933 /* Save the info for this linker file. */
1934 kobase[i].pm_file = lf->filename;
1935 kobase[i].pm_address = (uintptr_t)lf->address;
1938 sx_sunlock(&kld_sx);
1940 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
1942 /* The last entry of the malloced area comprises of all zeros. */
1943 KASSERT(kobase[i].pm_file == NULL,
1944 ("linker_hwpmc_list_objects: last object not NULL"));
1946 return ((void *)kobase);
1951 * Find a file which contains given module and load it, if "parent" is not
1952 * NULL, register a reference to it.
1955 linker_load_module(const char *kldname, const char *modname,
1956 struct linker_file *parent, const struct mod_depend *verinfo,
1957 struct linker_file **lfpp)
1959 linker_file_t lfdep;
1960 const char *filename;
1964 sx_assert(&kld_sx, SA_XLOCKED);
1965 if (modname == NULL) {
1967 * We have to load KLD
1969 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
1971 pathname = linker_search_kld(kldname);
1973 if (modlist_lookup2(modname, verinfo) != NULL)
1975 if (kldname != NULL)
1976 pathname = strdup(kldname, M_LINKER);
1977 else if (rootvnode == NULL)
1981 * Need to find a KLD with required module
1983 pathname = linker_search_module(modname,
1984 strlen(modname), verinfo);
1986 if (pathname == NULL)
1990 * Can't load more than one file with the same basename XXX:
1991 * Actually it should be possible to have multiple KLDs with
1992 * the same basename but different path because they can
1993 * provide different versions of the same modules.
1995 filename = linker_basename(pathname);
1996 if (linker_find_file_by_name(filename))
1999 error = linker_load_file(pathname, &lfdep);
2002 if (modname && verinfo &&
2003 modlist_lookup2(modname, verinfo) == NULL) {
2004 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2009 error = linker_file_add_dependency(parent, lfdep);
2016 free(pathname, M_LINKER);
2021 * This routine is responsible for finding dependencies of userland initiated
2022 * kldload(2)'s of files.
2025 linker_load_dependencies(linker_file_t lf)
2027 linker_file_t lfdep;
2028 struct mod_metadata **start, **stop, **mdp, **nmdp;
2029 struct mod_metadata *mp, *nmp;
2030 const struct mod_depend *verinfo;
2032 const char *modname, *nmodname;
2033 int ver, error = 0, count;
2036 * All files are dependant on /kernel.
2038 sx_assert(&kld_sx, SA_XLOCKED);
2039 if (linker_kernel_file) {
2040 linker_kernel_file->refs++;
2041 error = linker_file_add_dependency(lf, linker_kernel_file);
2045 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2048 for (mdp = start; mdp < stop; mdp++) {
2050 if (mp->md_type != MDT_VERSION)
2052 modname = mp->md_cval;
2053 ver = ((struct mod_version *)mp->md_data)->mv_version;
2054 mod = modlist_lookup(modname, ver);
2056 printf("interface %s.%d already present in the KLD"
2057 " '%s'!\n", modname, ver,
2058 mod->container->filename);
2063 for (mdp = start; mdp < stop; mdp++) {
2065 if (mp->md_type != MDT_DEPEND)
2067 modname = mp->md_cval;
2068 verinfo = mp->md_data;
2070 for (nmdp = start; nmdp < stop; nmdp++) {
2072 if (nmp->md_type != MDT_VERSION)
2074 nmodname = nmp->md_cval;
2075 if (strcmp(modname, nmodname) == 0)
2078 if (nmdp < stop)/* early exit, it's a self reference */
2080 mod = modlist_lookup2(modname, verinfo);
2081 if (mod) { /* woohoo, it's loaded already */
2082 lfdep = mod->container;
2084 error = linker_file_add_dependency(lf, lfdep);
2089 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2091 printf("KLD %s: depends on %s - not available or"
2092 " version mismatch\n", lf->filename, modname);
2099 linker_addmodules(lf, start, stop, 0);
2104 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2106 struct sysctl_req *req;
2109 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2113 * Export a nul-separated, double-nul-terminated list of all function names
2117 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2123 error = mac_kld_check_stat(req->td->td_ucred);
2127 error = sysctl_wire_old_buffer(req, 0);
2131 TAILQ_FOREACH(lf, &linker_files, link) {
2132 error = LINKER_EACH_FUNCTION_NAME(lf,
2133 sysctl_kern_function_list_iterate, req);
2135 sx_xunlock(&kld_sx);
2139 sx_xunlock(&kld_sx);
2140 return (SYSCTL_OUT(req, "", 1));
2143 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2144 NULL, 0, sysctl_kern_function_list, "", "kernel function list");