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");
73 /* These variables are used by kernel debuggers to enumerate loaded files. */
74 const int kld_off_address = offsetof(struct linker_file, address);
75 const int kld_off_filename = offsetof(struct linker_file, filename);
76 const int kld_off_pathname = offsetof(struct linker_file, pathname);
77 const int kld_off_next = offsetof(struct linker_file, link.tqe_next);
80 * static char *linker_search_path(const char *name, struct mod_depend
83 static const char *linker_basename(const char *path);
86 * Find a currently loaded file given its filename.
88 static linker_file_t linker_find_file_by_name(const char* _filename);
91 * Find a currently loaded file given its file id.
93 static linker_file_t linker_find_file_by_id(int _fileid);
95 /* Metadata from the static kernel */
96 SET_DECLARE(modmetadata_set, struct mod_metadata);
98 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
100 linker_file_t linker_kernel_file;
102 static struct sx kld_sx; /* kernel linker lock */
105 * Load counter used by clients to determine if a linker file has been
106 * re-loaded. This counter is incremented for each file load.
110 static linker_class_list_t classes;
111 static linker_file_list_t linker_files;
112 static int next_file_id = 1;
113 static int linker_no_more_classes = 0;
115 #define LINKER_GET_NEXT_FILE_ID(a) do { \
116 linker_file_t lftmp; \
119 sx_assert(&kld_sx, SA_XLOCKED); \
121 TAILQ_FOREACH(lftmp, &linker_files, link) { \
122 if (next_file_id == lftmp->id) { \
127 (a) = next_file_id; \
131 /* XXX wrong name; we're looking at version provision tags here, not modules */
132 typedef TAILQ_HEAD(, modlist) modlisthead_t;
134 TAILQ_ENTRY(modlist) link; /* chain together all modules */
135 linker_file_t container;
139 typedef struct modlist *modlist_t;
140 static modlisthead_t found_modules;
142 static int linker_file_add_dependency(linker_file_t file,
144 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
145 const char* name, int deps);
146 static int linker_load_module(const char *kldname,
147 const char *modname, struct linker_file *parent,
148 const struct mod_depend *verinfo, struct linker_file **lfpp);
149 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
152 linker_init(void *arg)
155 sx_init(&kld_sx, "kernel linker");
156 TAILQ_INIT(&classes);
157 TAILQ_INIT(&linker_files);
160 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
163 linker_stop_class_add(void *arg)
166 linker_no_more_classes = 1;
169 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
172 linker_add_class(linker_class_t lc)
176 * We disallow any class registration past SI_ORDER_ANY
177 * of SI_SUB_KLD. We bump the reference count to keep the
178 * ops from being freed.
180 if (linker_no_more_classes == 1)
182 kobj_class_compile((kobj_class_t) lc);
183 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
184 TAILQ_INSERT_TAIL(&classes, lc, link);
189 linker_file_sysinit(linker_file_t lf)
191 struct sysinit **start, **stop, **sipp, **xipp, *save;
193 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
196 sx_assert(&kld_sx, SA_XLOCKED);
198 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
201 * Perform a bubble sort of the system initialization objects by
202 * their subsystem (primary key) and order (secondary key).
204 * Since some things care about execution order, this is the operation
205 * which ensures continued function.
207 for (sipp = start; sipp < stop; sipp++) {
208 for (xipp = sipp + 1; xipp < stop; xipp++) {
209 if ((*sipp)->subsystem < (*xipp)->subsystem ||
210 ((*sipp)->subsystem == (*xipp)->subsystem &&
211 (*sipp)->order <= (*xipp)->order))
220 * Traverse the (now) ordered list of system initialization tasks.
221 * Perform each task, and continue on to the next task.
225 for (sipp = start; sipp < stop; sipp++) {
226 if ((*sipp)->subsystem == SI_SUB_DUMMY)
227 continue; /* skip dummy task(s) */
230 (*((*sipp)->func)) ((*sipp)->udata);
237 linker_file_sysuninit(linker_file_t lf)
239 struct sysinit **start, **stop, **sipp, **xipp, *save;
241 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
244 sx_assert(&kld_sx, SA_XLOCKED);
246 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
251 * Perform a reverse bubble sort of the system initialization objects
252 * by their subsystem (primary key) and order (secondary key).
254 * Since some things care about execution order, this is the operation
255 * which ensures continued function.
257 for (sipp = start; sipp < stop; sipp++) {
258 for (xipp = sipp + 1; xipp < stop; xipp++) {
259 if ((*sipp)->subsystem > (*xipp)->subsystem ||
260 ((*sipp)->subsystem == (*xipp)->subsystem &&
261 (*sipp)->order >= (*xipp)->order))
270 * Traverse the (now) ordered list of system initialization tasks.
271 * Perform each task, and continue on to the next task.
275 for (sipp = start; sipp < stop; sipp++) {
276 if ((*sipp)->subsystem == SI_SUB_DUMMY)
277 continue; /* skip dummy task(s) */
280 (*((*sipp)->func)) ((*sipp)->udata);
287 linker_file_register_sysctls(linker_file_t lf)
289 struct sysctl_oid **start, **stop, **oidp;
292 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
295 sx_assert(&kld_sx, SA_XLOCKED);
297 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
302 for (oidp = start; oidp < stop; oidp++)
303 sysctl_register_oid(*oidp);
309 linker_file_unregister_sysctls(linker_file_t lf)
311 struct sysctl_oid **start, **stop, **oidp;
313 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
314 " for %s\n", lf->filename));
316 sx_assert(&kld_sx, SA_XLOCKED);
318 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
323 for (oidp = start; oidp < stop; oidp++)
324 sysctl_unregister_oid(*oidp);
330 linker_file_register_modules(linker_file_t lf)
332 struct mod_metadata **start, **stop, **mdp;
333 const moduledata_t *moddata;
334 int first_error, error;
336 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
337 " in %s\n", lf->filename));
339 sx_assert(&kld_sx, SA_XLOCKED);
341 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
344 * This fallback should be unnecessary, but if we get booted
345 * from boot2 instead of loader and we are missing our
346 * metadata then we have to try the best we can.
348 if (lf == linker_kernel_file) {
349 start = SET_BEGIN(modmetadata_set);
350 stop = SET_LIMIT(modmetadata_set);
355 for (mdp = start; mdp < stop; mdp++) {
356 if ((*mdp)->md_type != MDT_MODULE)
358 moddata = (*mdp)->md_data;
359 KLD_DPF(FILE, ("Registering module %s in %s\n",
360 moddata->name, lf->filename));
361 error = module_register(moddata, lf);
363 printf("Module %s failed to register: %d\n",
364 moddata->name, error);
365 if (first_error == 0)
369 return (first_error);
373 linker_init_kernel_modules(void)
377 linker_file_register_modules(linker_kernel_file);
381 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
385 linker_load_file(const char *filename, linker_file_t *result)
389 int foundfile, error, modules;
391 /* Refuse to load modules if securelevel raised */
392 if (prison0.pr_securelevel > 0)
395 sx_assert(&kld_sx, SA_XLOCKED);
396 lf = linker_find_file_by_name(filename);
398 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
399 " incrementing refs\n", filename));
408 * We do not need to protect (lock) classes here because there is
409 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
410 * and there is no class deregistration mechanism at this time.
412 TAILQ_FOREACH(lc, &classes, link) {
413 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
415 error = LINKER_LOAD_FILE(lc, filename, &lf);
417 * If we got something other than ENOENT, then it exists but
418 * we cannot load it for some other reason.
423 error = linker_file_register_modules(lf);
424 if (error == EEXIST) {
425 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
428 modules = !TAILQ_EMPTY(&lf->modules);
429 linker_file_register_sysctls(lf);
430 linker_file_sysinit(lf);
431 lf->flags |= LINKER_FILE_LINKED;
434 * If all of the modules in this file failed
435 * to load, unload the file and return an
438 if (modules && TAILQ_EMPTY(&lf->modules)) {
439 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
442 EVENTHANDLER_INVOKE(kld_load, lf);
448 * Less than ideal, but tells the user whether it failed to load or
449 * the module was not found.
454 * If the file type has not been recognized by the last try
455 * printout a message before to fail.
458 printf("linker_load_file: Unsupported file type\n");
461 * Format not recognized or otherwise unloadable.
462 * When loading a module that is statically built into
463 * the kernel EEXIST percolates back up as the return
464 * value. Preserve this so that apps like sysinstall
465 * can recognize this special case and not post bogus
471 error = ENOENT; /* Nothing found */
476 linker_reference_module(const char *modname, struct mod_depend *verinfo,
477 linker_file_t *result)
483 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
484 *result = mod->container;
490 error = linker_load_module(NULL, modname, NULL, verinfo, result);
496 linker_release_module(const char *modname, struct mod_depend *verinfo,
504 KASSERT(modname != NULL,
505 ("linker_release_module: no file or name"));
506 mod = modlist_lookup2(modname, verinfo);
513 KASSERT(modname == NULL && verinfo == NULL,
514 ("linker_release_module: both file and name"));
515 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
521 linker_find_file_by_name(const char *filename)
526 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
527 sprintf(koname, "%s.ko", filename);
529 sx_assert(&kld_sx, SA_XLOCKED);
530 TAILQ_FOREACH(lf, &linker_files, link) {
531 if (strcmp(lf->filename, koname) == 0)
533 if (strcmp(lf->filename, filename) == 0)
536 free(koname, M_LINKER);
541 linker_find_file_by_id(int fileid)
545 sx_assert(&kld_sx, SA_XLOCKED);
546 TAILQ_FOREACH(lf, &linker_files, link)
547 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
553 linker_file_foreach(linker_predicate_t *predicate, void *context)
559 TAILQ_FOREACH(lf, &linker_files, link) {
560 retval = predicate(lf, context);
569 linker_make_file(const char *pathname, linker_class_t lc)
572 const char *filename;
575 sx_assert(&kld_sx, SA_XLOCKED);
576 filename = linker_basename(pathname);
578 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
579 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
587 lf->filename = strdup(filename, M_LINKER);
588 lf->pathname = strdup(pathname, M_LINKER);
589 LINKER_GET_NEXT_FILE_ID(lf->id);
592 lf->loadcnt = ++loadcnt;
593 STAILQ_INIT(&lf->common);
594 TAILQ_INIT(&lf->modules);
595 TAILQ_INSERT_TAIL(&linker_files, lf, link);
600 linker_file_unload(linker_file_t file, int flags)
603 modlist_t ml, nextml;
604 struct common_symbol *cp;
607 /* Refuse to unload modules if securelevel raised. */
608 if (prison0.pr_securelevel > 0)
611 sx_assert(&kld_sx, SA_XLOCKED);
612 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
614 /* Easy case of just dropping a reference. */
615 if (file->refs > 1) {
620 /* Give eventhandlers a chance to prevent the unload. */
622 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
626 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
627 " informing modules\n"));
630 * Quiesce all the modules to give them a chance to veto the unload.
633 for (mod = TAILQ_FIRST(&file->modules); mod;
634 mod = module_getfnext(mod)) {
636 error = module_quiesce(mod);
637 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
638 KLD_DPF(FILE, ("linker_file_unload: module %s"
639 " vetoed unload\n", module_getname(mod)));
641 * XXX: Do we need to tell all the quiesced modules
642 * that they can resume work now via a new module
652 * Inform any modules associated with this file that they are
656 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
657 next = module_getfnext(mod);
661 * Give the module a chance to veto the unload.
663 if ((error = module_unload(mod)) != 0) {
666 KLD_DPF(FILE, ("linker_file_unload: module %s"
667 " failed unload\n", module_getname(mod)));
677 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
678 if (ml->container == file) {
679 TAILQ_REMOVE(&found_modules, ml, link);
685 * Don't try to run SYSUNINITs if we are unloaded due to a
688 if (file->flags & LINKER_FILE_LINKED) {
689 file->flags &= ~LINKER_FILE_LINKED;
690 linker_file_sysuninit(file);
691 linker_file_unregister_sysctls(file);
693 TAILQ_REMOVE(&linker_files, file, link);
696 for (i = 0; i < file->ndeps; i++)
697 linker_file_unload(file->deps[i], flags);
698 free(file->deps, M_LINKER);
701 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
702 STAILQ_REMOVE_HEAD(&file->common, link);
708 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
711 if (file->filename) {
712 free(file->filename, M_LINKER);
713 file->filename = NULL;
715 if (file->pathname) {
716 free(file->pathname, M_LINKER);
717 file->pathname = NULL;
719 kobj_delete((kobj_t) file, M_LINKER);
724 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
726 return (LINKER_CTF_GET(file, lc));
730 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
732 linker_file_t *newdeps;
734 sx_assert(&kld_sx, SA_XLOCKED);
735 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
736 M_LINKER, M_WAITOK | M_ZERO);
737 file->deps[file->ndeps] = dep;
739 KLD_DPF(FILE, ("linker_file_add_dependency:"
740 " adding %s as dependency for %s\n",
741 dep->filename, file->filename));
746 * Locate a linker set and its contents. This is a helper function to avoid
747 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
748 * This function is used in this file so we can avoid having lots of (void **)
752 linker_file_lookup_set(linker_file_t file, const char *name,
753 void *firstp, void *lastp, int *countp)
756 sx_assert(&kld_sx, SA_LOCKED);
757 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
761 * List all functions in a file.
764 linker_file_function_listall(linker_file_t lf,
765 linker_function_nameval_callback_t callback_func, void *arg)
767 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
771 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
776 locked = sx_xlocked(&kld_sx);
779 sym = linker_file_lookup_symbol_internal(file, name, deps);
786 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
790 linker_symval_t symval;
792 size_t common_size = 0;
795 sx_assert(&kld_sx, SA_XLOCKED);
796 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
799 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
800 LINKER_SYMBOL_VALUES(file, sym, &symval);
801 if (symval.value == 0)
803 * For commons, first look them up in the
804 * dependencies and only allocate space if not found
807 common_size = symval.size;
809 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
810 ".value=%p\n", symval.value));
811 return (symval.value);
815 for (i = 0; i < file->ndeps; i++) {
816 address = linker_file_lookup_symbol_internal(
817 file->deps[i], name, 0);
819 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
820 " deps value=%p\n", address));
825 if (common_size > 0) {
827 * This is a common symbol which was not found in the
828 * dependencies. We maintain a simple common symbol table in
831 struct common_symbol *cp;
833 STAILQ_FOREACH(cp, &file->common, link) {
834 if (strcmp(cp->name, name) == 0) {
835 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
836 " old common value=%p\n", cp->address));
837 return (cp->address);
841 * Round the symbol size up to align.
843 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
844 cp = malloc(sizeof(struct common_symbol)
845 + common_size + strlen(name) + 1, M_LINKER,
847 cp->address = (caddr_t)(cp + 1);
848 cp->name = cp->address + common_size;
849 strcpy(cp->name, name);
850 bzero(cp->address, common_size);
851 STAILQ_INSERT_TAIL(&file->common, cp, link);
853 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
854 " value=%p\n", cp->address));
855 return (cp->address);
857 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
862 * Both DDB and stack(9) rely on the kernel linker to provide forward and
863 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
864 * do this in a lockfree manner. We provide a set of internal helper
865 * routines to perform these operations without locks, and then wrappers that
868 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
872 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
876 TAILQ_FOREACH(lf, &linker_files, link) {
877 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
885 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
888 c_linker_sym_t best, es;
889 u_long diff, bestdiff, off;
892 off = (uintptr_t)value;
894 TAILQ_FOREACH(lf, &linker_files, link) {
895 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
897 if (es != 0 && diff < bestdiff) {
916 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
920 TAILQ_FOREACH(lf, &linker_files, link) {
921 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
928 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
931 linker_symval_t symval;
936 error = linker_debug_search_symbol(value, &sym, offset);
939 error = linker_debug_symbol_values(sym, &symval);
942 strlcpy(buf, symval.name, buflen);
947 * DDB Helpers. DDB has to look across multiple files with their own symbol
948 * tables and string tables.
950 * Note that we do not obey list locking protocols here. We really don't need
951 * DDB to hang because somebody's got the lock held. We'll take the chance
952 * that the files list is inconsistant instead.
956 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
959 return (linker_debug_lookup(symstr, sym));
964 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
967 return (linker_debug_search_symbol(value, sym, diffp));
971 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
974 return (linker_debug_symbol_values(sym, symval));
978 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
982 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
986 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
987 * obey locking protocols, and offer a significantly less complex interface.
990 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
996 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1005 kern_kldload(struct thread *td, const char *file, int *fileid)
1007 const char *kldname, *modname;
1011 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1014 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1018 * It is possible that kldloaded module will attach a new ifnet,
1019 * so vnet context must be set when this ocurs.
1021 CURVNET_SET(TD_TO_VNET(td));
1024 * If file does not contain a qualified name or any dot in it
1025 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1028 if (strchr(file, '/') || strchr(file, '.')) {
1037 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1039 sx_xunlock(&kld_sx);
1045 sx_xunlock(&kld_sx);
1053 sys_kldload(struct thread *td, struct kldload_args *uap)
1055 char *pathname = NULL;
1058 td->td_retval[0] = -1;
1060 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1061 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1063 error = kern_kldload(td, pathname, &fileid);
1065 td->td_retval[0] = fileid;
1067 free(pathname, M_TEMP);
1072 kern_kldunload(struct thread *td, int fileid, int flags)
1077 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1080 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1083 CURVNET_SET(TD_TO_VNET(td));
1085 lf = linker_find_file_by_id(fileid);
1087 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1089 if (lf->userrefs == 0) {
1091 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1093 printf("kldunload: attempt to unload file that was"
1094 " loaded by the kernel\n");
1098 error = linker_file_unload(lf, flags);
1104 sx_xunlock(&kld_sx);
1111 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1114 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1118 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1121 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1122 uap->flags != LINKER_UNLOAD_FORCE)
1124 return (kern_kldunload(td, uap->fileid, uap->flags));
1128 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1131 const char *filename;
1136 error = mac_kld_check_stat(td->td_ucred);
1141 td->td_retval[0] = -1;
1143 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1144 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1147 filename = linker_basename(pathname);
1149 lf = linker_find_file_by_name(filename);
1151 td->td_retval[0] = lf->id;
1154 sx_xunlock(&kld_sx);
1156 free(pathname, M_TEMP);
1161 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1167 error = mac_kld_check_stat(td->td_ucred);
1173 if (uap->fileid == 0)
1174 lf = TAILQ_FIRST(&linker_files);
1176 lf = linker_find_file_by_id(uap->fileid);
1181 lf = TAILQ_NEXT(lf, link);
1184 /* Skip partially loaded files. */
1185 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1186 lf = TAILQ_NEXT(lf, link);
1189 td->td_retval[0] = lf->id;
1191 td->td_retval[0] = 0;
1193 sx_xunlock(&kld_sx);
1198 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1200 struct kld_file_stat stat;
1204 * Check the version of the user's structure.
1206 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1209 if (version != sizeof(struct kld_file_stat_1) &&
1210 version != sizeof(struct kld_file_stat))
1213 error = kern_kldstat(td, uap->fileid, &stat);
1216 return (copyout(&stat, uap->stat, version));
1220 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1227 error = mac_kld_check_stat(td->td_ucred);
1233 lf = linker_find_file_by_id(fileid);
1235 sx_xunlock(&kld_sx);
1239 /* Version 1 fields: */
1240 namelen = strlen(lf->filename) + 1;
1241 if (namelen > MAXPATHLEN)
1242 namelen = MAXPATHLEN;
1243 bcopy(lf->filename, &stat->name[0], namelen);
1244 stat->refs = lf->refs;
1246 stat->address = lf->address;
1247 stat->size = lf->size;
1248 /* Version 2 fields: */
1249 namelen = strlen(lf->pathname) + 1;
1250 if (namelen > MAXPATHLEN)
1251 namelen = MAXPATHLEN;
1252 bcopy(lf->pathname, &stat->pathname[0], namelen);
1253 sx_xunlock(&kld_sx);
1255 td->td_retval[0] = 0;
1260 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1267 error = mac_kld_check_stat(td->td_ucred);
1273 lf = linker_find_file_by_id(uap->fileid);
1276 mp = TAILQ_FIRST(&lf->modules);
1278 td->td_retval[0] = module_getid(mp);
1280 td->td_retval[0] = 0;
1284 sx_xunlock(&kld_sx);
1289 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1291 char *symstr = NULL;
1293 linker_symval_t symval;
1295 struct kld_sym_lookup lookup;
1299 error = mac_kld_check_stat(td->td_ucred);
1304 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1306 if (lookup.version != sizeof(lookup) ||
1307 uap->cmd != KLDSYM_LOOKUP)
1309 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1310 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1313 if (uap->fileid != 0) {
1314 lf = linker_find_file_by_id(uap->fileid);
1317 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1318 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1319 lookup.symvalue = (uintptr_t) symval.value;
1320 lookup.symsize = symval.size;
1321 error = copyout(&lookup, uap->data, sizeof(lookup));
1325 TAILQ_FOREACH(lf, &linker_files, link) {
1326 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1327 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1328 lookup.symvalue = (uintptr_t)symval.value;
1329 lookup.symsize = symval.size;
1330 error = copyout(&lookup, uap->data,
1338 sx_xunlock(&kld_sx);
1340 free(symstr, M_TEMP);
1345 * Preloaded module support
1349 modlist_lookup(const char *name, int ver)
1353 TAILQ_FOREACH(mod, &found_modules, link) {
1354 if (strcmp(mod->name, name) == 0 &&
1355 (ver == 0 || mod->version == ver))
1362 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1364 modlist_t mod, bestmod;
1367 if (verinfo == NULL)
1368 return (modlist_lookup(name, 0));
1370 TAILQ_FOREACH(mod, &found_modules, link) {
1371 if (strcmp(mod->name, name) != 0)
1374 if (ver == verinfo->md_ver_preferred)
1376 if (ver >= verinfo->md_ver_minimum &&
1377 ver <= verinfo->md_ver_maximum &&
1378 (bestmod == NULL || ver > bestmod->version))
1385 modlist_newmodule(const char *modname, int version, linker_file_t container)
1389 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1391 panic("no memory for module list");
1392 mod->container = container;
1393 mod->name = modname;
1394 mod->version = version;
1395 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1400 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1401 struct mod_metadata **stop, int preload)
1403 struct mod_metadata *mp, **mdp;
1404 const char *modname;
1407 for (mdp = start; mdp < stop; mdp++) {
1409 if (mp->md_type != MDT_VERSION)
1411 modname = mp->md_cval;
1412 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1413 if (modlist_lookup(modname, ver) != NULL) {
1414 printf("module %s already present!\n", modname);
1415 /* XXX what can we do? this is a build error. :-( */
1418 modlist_newmodule(modname, ver, lf);
1423 linker_preload(void *arg)
1426 const char *modname, *nmodname;
1428 linker_file_t lf, nlf;
1431 linker_file_list_t loaded_files;
1432 linker_file_list_t depended_files;
1433 struct mod_metadata *mp, *nmp;
1434 struct mod_metadata **start, **stop, **mdp, **nmdp;
1435 const struct mod_depend *verinfo;
1439 struct sysinit **si_start, **si_stop;
1441 TAILQ_INIT(&loaded_files);
1442 TAILQ_INIT(&depended_files);
1443 TAILQ_INIT(&found_modules);
1448 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1449 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1450 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1451 if (modname == NULL) {
1452 printf("Preloaded module at %p does not have a"
1453 " name!\n", modptr);
1456 if (modtype == NULL) {
1457 printf("Preloaded module at %p does not have a type!\n",
1462 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1465 TAILQ_FOREACH(lc, &classes, link) {
1466 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1472 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1476 * First get a list of stuff in the kernel.
1478 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1480 linker_addmodules(linker_kernel_file, start, stop, 1);
1483 * This is a once-off kinky bubble sort to resolve relocation
1484 * dependency requirements.
1487 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1488 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1491 * First, look to see if we would successfully link with this
1494 resolves = 1; /* unless we know otherwise */
1496 for (mdp = start; mdp < stop; mdp++) {
1498 if (mp->md_type != MDT_DEPEND)
1500 modname = mp->md_cval;
1501 verinfo = mp->md_data;
1502 for (nmdp = start; nmdp < stop; nmdp++) {
1504 if (nmp->md_type != MDT_VERSION)
1506 nmodname = nmp->md_cval;
1507 if (strcmp(modname, nmodname) == 0)
1510 if (nmdp < stop) /* it's a self reference */
1514 * ok, the module isn't here yet, we
1517 if (modlist_lookup2(modname, verinfo) == NULL)
1522 * OK, if we found our modules, we can link. So, "provide"
1523 * the modules inside and add it to the end of the link order
1528 for (mdp = start; mdp < stop; mdp++) {
1530 if (mp->md_type != MDT_VERSION)
1532 modname = mp->md_cval;
1533 nver = ((const struct mod_version *)
1534 mp->md_data)->mv_version;
1535 if (modlist_lookup(modname,
1537 printf("module %s already"
1538 " present!\n", modname);
1539 TAILQ_REMOVE(&loaded_files,
1541 linker_file_unload(lf,
1542 LINKER_UNLOAD_FORCE);
1543 /* we changed tailq next ptr */
1546 modlist_newmodule(modname, nver, lf);
1549 TAILQ_REMOVE(&loaded_files, lf, loaded);
1550 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1552 * Since we provided modules, we need to restart the
1553 * sort so that the previous files that depend on us
1554 * have a chance. Also, we've busted the tailq next
1555 * pointer with the REMOVE.
1562 * At this point, we check to see what could not be resolved..
1564 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1565 TAILQ_REMOVE(&loaded_files, lf, loaded);
1566 printf("KLD file %s is missing dependencies\n", lf->filename);
1567 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1571 * We made it. Finish off the linking in the order we determined.
1573 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1574 if (linker_kernel_file) {
1575 linker_kernel_file->refs++;
1576 error = linker_file_add_dependency(lf,
1577 linker_kernel_file);
1579 panic("cannot add dependency");
1581 lf->userrefs++; /* so we can (try to) kldunload it */
1582 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1585 for (mdp = start; mdp < stop; mdp++) {
1587 if (mp->md_type != MDT_DEPEND)
1589 modname = mp->md_cval;
1590 verinfo = mp->md_data;
1591 mod = modlist_lookup2(modname, verinfo);
1593 printf("KLD file %s - cannot find "
1594 "dependency \"%s\"\n",
1595 lf->filename, modname);
1598 /* Don't count self-dependencies */
1599 if (lf == mod->container)
1601 mod->container->refs++;
1602 error = linker_file_add_dependency(lf,
1605 panic("cannot add dependency");
1609 * Now do relocation etc using the symbol search paths
1610 * established by the dependencies
1612 error = LINKER_LINK_PRELOAD_FINISH(lf);
1614 printf("KLD file %s - could not finalize loading\n",
1618 linker_file_register_modules(lf);
1619 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1620 &si_stop, NULL) == 0)
1621 sysinit_add(si_start, si_stop);
1622 linker_file_register_sysctls(lf);
1623 lf->flags |= LINKER_FILE_LINKED;
1626 TAILQ_REMOVE(&depended_files, lf, loaded);
1627 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1629 sx_xunlock(&kld_sx);
1630 /* woohoo! we made it! */
1633 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1636 * Search for a not-loaded module by name.
1638 * Modules may be found in the following locations:
1640 * - preloaded (result is just the module name) - on disk (result is full path
1643 * If the module name is qualified in any way (contains path, etc.) the we
1644 * simply return a copy of it.
1646 * The search path can be manipulated via sysctl. Note that we use the ';'
1647 * character as a separator to be consistent with the bootloader.
1650 static char linker_hintfile[] = "linker.hints";
1651 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1653 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1654 sizeof(linker_path), "module load search path");
1656 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1658 static char *linker_ext_list[] = {
1665 * Check if file actually exists either with or without extension listed in
1666 * the linker_ext_list. (probably should be generic for the rest of the
1670 linker_lookup_file(const char *path, int pathlen, const char *name,
1671 int namelen, struct vattr *vap)
1673 struct nameidata nd;
1674 struct thread *td = curthread; /* XXX */
1675 char *result, **cpp, *sep;
1676 int error, len, extlen, reclen, flags;
1680 for (cpp = linker_ext_list; *cpp; cpp++) {
1685 extlen++; /* trailing '\0' */
1686 sep = (path[pathlen - 1] != '/') ? "/" : "";
1688 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1689 result = malloc(reclen, M_LINKER, M_WAITOK);
1690 for (cpp = linker_ext_list; *cpp; cpp++) {
1691 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1692 namelen, name, *cpp);
1694 * Attempt to open the file, and return the path if
1695 * we succeed and it's a regular file.
1697 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1699 error = vn_open(&nd, &flags, 0, NULL);
1701 NDFREE(&nd, NDF_ONLY_PNBUF);
1702 type = nd.ni_vp->v_type;
1704 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1705 VOP_UNLOCK(nd.ni_vp, 0);
1706 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1711 free(result, M_LINKER);
1715 #define INT_ALIGN(base, ptr) ptr = \
1716 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
1719 * Lookup KLD which contains requested module in the "linker.hints" file. If
1720 * version specification is available, then try to find the best KLD.
1721 * Otherwise just find the latest one.
1724 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1725 int modnamelen, const struct mod_depend *verinfo)
1727 struct thread *td = curthread; /* XXX */
1728 struct ucred *cred = td ? td->td_ucred : NULL;
1729 struct nameidata nd;
1730 struct vattr vattr, mattr;
1731 u_char *hints = NULL;
1732 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1733 int error, ival, bestver, *intp, found, flags, clen, blen;
1737 bestver = found = 0;
1739 sep = (path[pathlen - 1] != '/') ? "/" : "";
1740 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1742 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1743 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1746 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1748 error = vn_open(&nd, &flags, 0, NULL);
1751 NDFREE(&nd, NDF_ONLY_PNBUF);
1752 if (nd.ni_vp->v_type != VREG)
1755 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1759 * XXX: we need to limit this number to some reasonable value
1761 if (vattr.va_size > LINKER_HINTS_MAX) {
1762 printf("hints file too large %ld\n", (long)vattr.va_size);
1765 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1766 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1767 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1770 VOP_UNLOCK(nd.ni_vp, 0);
1771 vn_close(nd.ni_vp, FREAD, cred, td);
1774 printf("can't read %zd\n", reclen);
1777 intp = (int *)hints;
1779 if (ival != LINKER_HINTS_VERSION) {
1780 printf("hints file version mismatch %d\n", ival);
1783 bufend = hints + vattr.va_size;
1784 recptr = (u_char *)intp;
1786 while (recptr < bufend && !found) {
1787 intp = (int *)recptr;
1794 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1797 INT_ALIGN(hints, cp);
1801 if (verinfo == NULL ||
1802 ival == verinfo->md_ver_preferred) {
1806 if (ival >= verinfo->md_ver_minimum &&
1807 ival <= verinfo->md_ver_maximum &&
1817 recptr += reclen + sizeof(int);
1820 * Finally check if KLD is in the place
1823 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1825 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1828 * KLD is newer than hints file. What we should do now?
1830 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1831 printf("warning: KLD '%s' is newer than the linker.hints"
1834 free(pathbuf, M_LINKER);
1836 free(hints, M_TEMP);
1837 if (nd.ni_vp != NULL) {
1838 VOP_UNLOCK(nd.ni_vp, 0);
1839 vn_close(nd.ni_vp, FREAD, cred, td);
1842 * If nothing found or hints is absent - fallback to the old
1843 * way by using "kldname[.ko]" as module name.
1845 if (!found && !bestver && result == NULL)
1846 result = linker_lookup_file(path, pathlen, modname,
1852 * Lookup KLD which contains requested module in the all directories.
1855 linker_search_module(const char *modname, int modnamelen,
1856 const struct mod_depend *verinfo)
1858 char *cp, *ep, *result;
1861 * traverse the linker path
1863 for (cp = linker_path; *cp; cp = ep + 1) {
1864 /* find the end of this component */
1865 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1866 result = linker_hints_lookup(cp, ep - cp, modname,
1867 modnamelen, verinfo);
1877 * Search for module in all directories listed in the linker_path.
1880 linker_search_kld(const char *name)
1882 char *cp, *ep, *result;
1885 /* qualified at all? */
1886 if (strchr(name, '/'))
1887 return (strdup(name, M_LINKER));
1889 /* traverse the linker path */
1891 for (ep = linker_path; *ep; ep++) {
1893 /* find the end of this component */
1894 for (; *ep != 0 && *ep != ';'; ep++);
1895 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1903 linker_basename(const char *path)
1905 const char *filename;
1907 filename = strrchr(path, '/');
1908 if (filename == NULL)
1917 * Inform hwpmc about the set of kernel modules currently loaded.
1920 linker_hwpmc_list_objects(void)
1923 struct pmckern_map_in *kobase;
1928 TAILQ_FOREACH(lf, &linker_files, link)
1931 /* Allocate nmappings + 1 entries. */
1932 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1933 M_LINKER, M_WAITOK | M_ZERO);
1935 TAILQ_FOREACH(lf, &linker_files, link) {
1937 /* Save the info for this linker file. */
1938 kobase[i].pm_file = lf->filename;
1939 kobase[i].pm_address = (uintptr_t)lf->address;
1942 sx_sunlock(&kld_sx);
1944 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
1946 /* The last entry of the malloced area comprises of all zeros. */
1947 KASSERT(kobase[i].pm_file == NULL,
1948 ("linker_hwpmc_list_objects: last object not NULL"));
1950 return ((void *)kobase);
1955 * Find a file which contains given module and load it, if "parent" is not
1956 * NULL, register a reference to it.
1959 linker_load_module(const char *kldname, const char *modname,
1960 struct linker_file *parent, const struct mod_depend *verinfo,
1961 struct linker_file **lfpp)
1963 linker_file_t lfdep;
1964 const char *filename;
1968 sx_assert(&kld_sx, SA_XLOCKED);
1969 if (modname == NULL) {
1971 * We have to load KLD
1973 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
1975 pathname = linker_search_kld(kldname);
1977 if (modlist_lookup2(modname, verinfo) != NULL)
1979 if (kldname != NULL)
1980 pathname = strdup(kldname, M_LINKER);
1981 else if (rootvnode == NULL)
1985 * Need to find a KLD with required module
1987 pathname = linker_search_module(modname,
1988 strlen(modname), verinfo);
1990 if (pathname == NULL)
1994 * Can't load more than one file with the same basename XXX:
1995 * Actually it should be possible to have multiple KLDs with
1996 * the same basename but different path because they can
1997 * provide different versions of the same modules.
1999 filename = linker_basename(pathname);
2000 if (linker_find_file_by_name(filename))
2003 error = linker_load_file(pathname, &lfdep);
2006 if (modname && verinfo &&
2007 modlist_lookup2(modname, verinfo) == NULL) {
2008 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2013 error = linker_file_add_dependency(parent, lfdep);
2020 free(pathname, M_LINKER);
2025 * This routine is responsible for finding dependencies of userland initiated
2026 * kldload(2)'s of files.
2029 linker_load_dependencies(linker_file_t lf)
2031 linker_file_t lfdep;
2032 struct mod_metadata **start, **stop, **mdp, **nmdp;
2033 struct mod_metadata *mp, *nmp;
2034 const struct mod_depend *verinfo;
2036 const char *modname, *nmodname;
2037 int ver, error = 0, count;
2040 * All files are dependant on /kernel.
2042 sx_assert(&kld_sx, SA_XLOCKED);
2043 if (linker_kernel_file) {
2044 linker_kernel_file->refs++;
2045 error = linker_file_add_dependency(lf, linker_kernel_file);
2049 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2052 for (mdp = start; mdp < stop; mdp++) {
2054 if (mp->md_type != MDT_VERSION)
2056 modname = mp->md_cval;
2057 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2058 mod = modlist_lookup(modname, ver);
2060 printf("interface %s.%d already present in the KLD"
2061 " '%s'!\n", modname, ver,
2062 mod->container->filename);
2067 for (mdp = start; mdp < stop; mdp++) {
2069 if (mp->md_type != MDT_DEPEND)
2071 modname = mp->md_cval;
2072 verinfo = mp->md_data;
2074 for (nmdp = start; nmdp < stop; nmdp++) {
2076 if (nmp->md_type != MDT_VERSION)
2078 nmodname = nmp->md_cval;
2079 if (strcmp(modname, nmodname) == 0)
2082 if (nmdp < stop)/* early exit, it's a self reference */
2084 mod = modlist_lookup2(modname, verinfo);
2085 if (mod) { /* woohoo, it's loaded already */
2086 lfdep = mod->container;
2088 error = linker_file_add_dependency(lf, lfdep);
2093 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2095 printf("KLD %s: depends on %s - not available or"
2096 " version mismatch\n", lf->filename, modname);
2103 linker_addmodules(lf, start, stop, 0);
2108 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2110 struct sysctl_req *req;
2113 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2117 * Export a nul-separated, double-nul-terminated list of all function names
2121 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2127 error = mac_kld_check_stat(req->td->td_ucred);
2131 error = sysctl_wire_old_buffer(req, 0);
2135 TAILQ_FOREACH(lf, &linker_files, link) {
2136 error = LINKER_EACH_FUNCTION_NAME(lf,
2137 sysctl_kern_function_list_iterate, req);
2139 sx_xunlock(&kld_sx);
2143 sx_xunlock(&kld_sx);
2144 return (SYSCTL_OUT(req, "", 1));
2147 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2148 NULL, 0, sysctl_kern_function_list, "", "kernel function list");