2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1997-2000 Doug Rabson
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include "opt_hwpmc_hooks.h"
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/sysproto.h>
41 #include <sys/sysent.h>
45 #include <sys/mutex.h>
47 #include <sys/module.h>
48 #include <sys/mount.h>
49 #include <sys/linker.h>
50 #include <sys/eventhandler.h>
51 #include <sys/fcntl.h>
53 #include <sys/libkern.h>
54 #include <sys/namei.h>
55 #include <sys/vnode.h>
56 #include <sys/syscallsubr.h>
57 #include <sys/sysctl.h>
65 #include <security/mac/mac_framework.h>
67 #include "linker_if.h"
70 #include <sys/pmckern.h>
75 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN,
76 &kld_debug, 0, "Set various levels of KLD debug");
79 /* These variables are used by kernel debuggers to enumerate loaded files. */
80 const int kld_off_address = offsetof(struct linker_file, address);
81 const int kld_off_filename = offsetof(struct linker_file, filename);
82 const int kld_off_pathname = offsetof(struct linker_file, pathname);
83 const int kld_off_next = offsetof(struct linker_file, link.tqe_next);
86 * static char *linker_search_path(const char *name, struct mod_depend
89 static const char *linker_basename(const char *path);
92 * Find a currently loaded file given its filename.
94 static linker_file_t linker_find_file_by_name(const char* _filename);
97 * Find a currently loaded file given its file id.
99 static linker_file_t linker_find_file_by_id(int _fileid);
101 /* Metadata from the static kernel */
102 SET_DECLARE(modmetadata_set, struct mod_metadata);
104 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
106 linker_file_t linker_kernel_file;
108 static struct sx kld_sx; /* kernel linker lock */
111 * Load counter used by clients to determine if a linker file has been
112 * re-loaded. This counter is incremented for each file load.
116 static linker_class_list_t classes;
117 static linker_file_list_t linker_files;
118 static int next_file_id = 1;
119 static int linker_no_more_classes = 0;
121 #define LINKER_GET_NEXT_FILE_ID(a) do { \
122 linker_file_t lftmp; \
125 sx_assert(&kld_sx, SA_XLOCKED); \
127 TAILQ_FOREACH(lftmp, &linker_files, link) { \
128 if (next_file_id == lftmp->id) { \
133 (a) = next_file_id; \
137 /* XXX wrong name; we're looking at version provision tags here, not modules */
138 typedef TAILQ_HEAD(, modlist) modlisthead_t;
140 TAILQ_ENTRY(modlist) link; /* chain together all modules */
141 linker_file_t container;
145 typedef struct modlist *modlist_t;
146 static modlisthead_t found_modules;
148 static int linker_file_add_dependency(linker_file_t file,
150 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
151 const char* name, int deps);
152 static int linker_load_module(const char *kldname,
153 const char *modname, struct linker_file *parent,
154 const struct mod_depend *verinfo, struct linker_file **lfpp);
155 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
158 linker_init(void *arg)
161 sx_init(&kld_sx, "kernel linker");
162 TAILQ_INIT(&classes);
163 TAILQ_INIT(&linker_files);
166 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
169 linker_stop_class_add(void *arg)
172 linker_no_more_classes = 1;
175 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
178 linker_add_class(linker_class_t lc)
182 * We disallow any class registration past SI_ORDER_ANY
183 * of SI_SUB_KLD. We bump the reference count to keep the
184 * ops from being freed.
186 if (linker_no_more_classes == 1)
188 kobj_class_compile((kobj_class_t) lc);
189 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
190 TAILQ_INSERT_TAIL(&classes, lc, link);
195 linker_file_sysinit(linker_file_t lf)
197 struct sysinit **start, **stop, **sipp, **xipp, *save;
199 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
202 sx_assert(&kld_sx, SA_XLOCKED);
204 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
207 * Perform a bubble sort of the system initialization objects by
208 * their subsystem (primary key) and order (secondary key).
210 * Since some things care about execution order, this is the operation
211 * which ensures continued function.
213 for (sipp = start; sipp < stop; sipp++) {
214 for (xipp = sipp + 1; xipp < stop; xipp++) {
215 if ((*sipp)->subsystem < (*xipp)->subsystem ||
216 ((*sipp)->subsystem == (*xipp)->subsystem &&
217 (*sipp)->order <= (*xipp)->order))
226 * Traverse the (now) ordered list of system initialization tasks.
227 * Perform each task, and continue on to the next task.
231 for (sipp = start; sipp < stop; sipp++) {
232 if ((*sipp)->subsystem == SI_SUB_DUMMY)
233 continue; /* skip dummy task(s) */
236 (*((*sipp)->func)) ((*sipp)->udata);
243 linker_file_sysuninit(linker_file_t lf)
245 struct sysinit **start, **stop, **sipp, **xipp, *save;
247 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
250 sx_assert(&kld_sx, SA_XLOCKED);
252 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
257 * Perform a reverse bubble sort of the system initialization objects
258 * by their subsystem (primary key) and order (secondary key).
260 * Since some things care about execution order, this is the operation
261 * which ensures continued function.
263 for (sipp = start; sipp < stop; sipp++) {
264 for (xipp = sipp + 1; xipp < stop; xipp++) {
265 if ((*sipp)->subsystem > (*xipp)->subsystem ||
266 ((*sipp)->subsystem == (*xipp)->subsystem &&
267 (*sipp)->order >= (*xipp)->order))
276 * Traverse the (now) ordered list of system initialization tasks.
277 * Perform each task, and continue on to the next task.
281 for (sipp = start; sipp < stop; sipp++) {
282 if ((*sipp)->subsystem == SI_SUB_DUMMY)
283 continue; /* skip dummy task(s) */
286 (*((*sipp)->func)) ((*sipp)->udata);
293 linker_file_register_sysctls(linker_file_t lf, bool enable)
295 struct sysctl_oid **start, **stop, **oidp;
298 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
301 sx_assert(&kld_sx, SA_XLOCKED);
303 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
308 for (oidp = start; oidp < stop; oidp++) {
310 sysctl_register_oid(*oidp);
312 sysctl_register_disabled_oid(*oidp);
319 linker_file_enable_sysctls(linker_file_t lf)
321 struct sysctl_oid **start, **stop, **oidp;
324 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n",
327 sx_assert(&kld_sx, SA_XLOCKED);
329 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
334 for (oidp = start; oidp < stop; oidp++)
335 sysctl_enable_oid(*oidp);
341 linker_file_unregister_sysctls(linker_file_t lf)
343 struct sysctl_oid **start, **stop, **oidp;
345 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
346 " for %s\n", lf->filename));
348 sx_assert(&kld_sx, SA_XLOCKED);
350 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
355 for (oidp = start; oidp < stop; oidp++)
356 sysctl_unregister_oid(*oidp);
362 linker_file_register_modules(linker_file_t lf)
364 struct mod_metadata **start, **stop, **mdp;
365 const moduledata_t *moddata;
366 int first_error, error;
368 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
369 " in %s\n", lf->filename));
371 sx_assert(&kld_sx, SA_XLOCKED);
373 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
376 * This fallback should be unnecessary, but if we get booted
377 * from boot2 instead of loader and we are missing our
378 * metadata then we have to try the best we can.
380 if (lf == linker_kernel_file) {
381 start = SET_BEGIN(modmetadata_set);
382 stop = SET_LIMIT(modmetadata_set);
387 for (mdp = start; mdp < stop; mdp++) {
388 if ((*mdp)->md_type != MDT_MODULE)
390 moddata = (*mdp)->md_data;
391 KLD_DPF(FILE, ("Registering module %s in %s\n",
392 moddata->name, lf->filename));
393 error = module_register(moddata, lf);
395 printf("Module %s failed to register: %d\n",
396 moddata->name, error);
397 if (first_error == 0)
401 return (first_error);
405 linker_init_kernel_modules(void)
409 linker_file_register_modules(linker_kernel_file);
413 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
417 linker_load_file(const char *filename, linker_file_t *result)
421 int foundfile, error, modules;
423 /* Refuse to load modules if securelevel raised */
424 if (prison0.pr_securelevel > 0)
427 sx_assert(&kld_sx, SA_XLOCKED);
428 lf = linker_find_file_by_name(filename);
430 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
431 " incrementing refs\n", filename));
440 * We do not need to protect (lock) classes here because there is
441 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
442 * and there is no class deregistration mechanism at this time.
444 TAILQ_FOREACH(lc, &classes, link) {
445 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
447 error = LINKER_LOAD_FILE(lc, filename, &lf);
449 * If we got something other than ENOENT, then it exists but
450 * we cannot load it for some other reason.
455 error = linker_file_register_modules(lf);
456 if (error == EEXIST) {
457 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
460 modules = !TAILQ_EMPTY(&lf->modules);
461 linker_file_register_sysctls(lf, false);
462 linker_file_sysinit(lf);
463 lf->flags |= LINKER_FILE_LINKED;
466 * If all of the modules in this file failed
467 * to load, unload the file and return an
470 if (modules && TAILQ_EMPTY(&lf->modules)) {
471 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
474 linker_file_enable_sysctls(lf);
475 EVENTHANDLER_INVOKE(kld_load, lf);
481 * Less than ideal, but tells the user whether it failed to load or
482 * the module was not found.
487 * If the file type has not been recognized by the last try
488 * printout a message before to fail.
491 printf("%s: %s - unsupported file type\n",
495 * Format not recognized or otherwise unloadable.
496 * When loading a module that is statically built into
497 * the kernel EEXIST percolates back up as the return
498 * value. Preserve this so that apps like sysinstall
499 * can recognize this special case and not post bogus
505 error = ENOENT; /* Nothing found */
510 linker_reference_module(const char *modname, struct mod_depend *verinfo,
511 linker_file_t *result)
517 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
518 *result = mod->container;
524 error = linker_load_module(NULL, modname, NULL, verinfo, result);
530 linker_release_module(const char *modname, struct mod_depend *verinfo,
538 KASSERT(modname != NULL,
539 ("linker_release_module: no file or name"));
540 mod = modlist_lookup2(modname, verinfo);
547 KASSERT(modname == NULL && verinfo == NULL,
548 ("linker_release_module: both file and name"));
549 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
555 linker_find_file_by_name(const char *filename)
560 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
561 sprintf(koname, "%s.ko", filename);
563 sx_assert(&kld_sx, SA_XLOCKED);
564 TAILQ_FOREACH(lf, &linker_files, link) {
565 if (strcmp(lf->filename, koname) == 0)
567 if (strcmp(lf->filename, filename) == 0)
570 free(koname, M_LINKER);
575 linker_find_file_by_id(int fileid)
579 sx_assert(&kld_sx, SA_XLOCKED);
580 TAILQ_FOREACH(lf, &linker_files, link)
581 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
587 linker_file_foreach(linker_predicate_t *predicate, void *context)
593 TAILQ_FOREACH(lf, &linker_files, link) {
594 retval = predicate(lf, context);
603 linker_make_file(const char *pathname, linker_class_t lc)
606 const char *filename;
609 sx_assert(&kld_sx, SA_XLOCKED);
610 filename = linker_basename(pathname);
612 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
613 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
621 lf->filename = strdup(filename, M_LINKER);
622 lf->pathname = strdup(pathname, M_LINKER);
623 LINKER_GET_NEXT_FILE_ID(lf->id);
626 lf->loadcnt = ++loadcnt;
627 STAILQ_INIT(&lf->common);
628 TAILQ_INIT(&lf->modules);
629 TAILQ_INSERT_TAIL(&linker_files, lf, link);
634 linker_file_unload(linker_file_t file, int flags)
637 modlist_t ml, nextml;
638 struct common_symbol *cp;
641 /* Refuse to unload modules if securelevel raised. */
642 if (prison0.pr_securelevel > 0)
645 sx_assert(&kld_sx, SA_XLOCKED);
646 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
648 /* Easy case of just dropping a reference. */
649 if (file->refs > 1) {
654 /* Give eventhandlers a chance to prevent the unload. */
656 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
660 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
661 " informing modules\n"));
664 * Quiesce all the modules to give them a chance to veto the unload.
667 for (mod = TAILQ_FIRST(&file->modules); mod;
668 mod = module_getfnext(mod)) {
670 error = module_quiesce(mod);
671 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
672 KLD_DPF(FILE, ("linker_file_unload: module %s"
673 " vetoed unload\n", module_getname(mod)));
675 * XXX: Do we need to tell all the quiesced modules
676 * that they can resume work now via a new module
686 * Inform any modules associated with this file that they are
690 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
691 next = module_getfnext(mod);
695 * Give the module a chance to veto the unload.
697 if ((error = module_unload(mod)) != 0) {
700 KLD_DPF(FILE, ("linker_file_unload: module %s"
701 " failed unload\n", module_getname(mod)));
711 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
712 if (ml->container == file) {
713 TAILQ_REMOVE(&found_modules, ml, link);
719 * Don't try to run SYSUNINITs if we are unloaded due to a
722 if (file->flags & LINKER_FILE_LINKED) {
723 file->flags &= ~LINKER_FILE_LINKED;
724 linker_file_unregister_sysctls(file);
725 linker_file_sysuninit(file);
727 TAILQ_REMOVE(&linker_files, file, link);
730 for (i = 0; i < file->ndeps; i++)
731 linker_file_unload(file->deps[i], flags);
732 free(file->deps, M_LINKER);
735 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
736 STAILQ_REMOVE_HEAD(&file->common, link);
742 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
745 if (file->filename) {
746 free(file->filename, M_LINKER);
747 file->filename = NULL;
749 if (file->pathname) {
750 free(file->pathname, M_LINKER);
751 file->pathname = NULL;
753 kobj_delete((kobj_t) file, M_LINKER);
758 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
760 return (LINKER_CTF_GET(file, lc));
764 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
766 linker_file_t *newdeps;
768 sx_assert(&kld_sx, SA_XLOCKED);
769 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
770 M_LINKER, M_WAITOK | M_ZERO);
771 file->deps[file->ndeps] = dep;
773 KLD_DPF(FILE, ("linker_file_add_dependency:"
774 " adding %s as dependency for %s\n",
775 dep->filename, file->filename));
780 * Locate a linker set and its contents. This is a helper function to avoid
781 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
782 * This function is used in this file so we can avoid having lots of (void **)
786 linker_file_lookup_set(linker_file_t file, const char *name,
787 void *firstp, void *lastp, int *countp)
790 sx_assert(&kld_sx, SA_LOCKED);
791 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
795 * List all functions in a file.
798 linker_file_function_listall(linker_file_t lf,
799 linker_function_nameval_callback_t callback_func, void *arg)
801 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
805 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
810 locked = sx_xlocked(&kld_sx);
813 sym = linker_file_lookup_symbol_internal(file, name, deps);
820 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
824 linker_symval_t symval;
826 size_t common_size = 0;
829 sx_assert(&kld_sx, SA_XLOCKED);
830 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
833 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
834 LINKER_SYMBOL_VALUES(file, sym, &symval);
835 if (symval.value == 0)
837 * For commons, first look them up in the
838 * dependencies and only allocate space if not found
841 common_size = symval.size;
843 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
844 ".value=%p\n", symval.value));
845 return (symval.value);
849 for (i = 0; i < file->ndeps; i++) {
850 address = linker_file_lookup_symbol_internal(
851 file->deps[i], name, 0);
853 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
854 " deps value=%p\n", address));
859 if (common_size > 0) {
861 * This is a common symbol which was not found in the
862 * dependencies. We maintain a simple common symbol table in
865 struct common_symbol *cp;
867 STAILQ_FOREACH(cp, &file->common, link) {
868 if (strcmp(cp->name, name) == 0) {
869 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
870 " old common value=%p\n", cp->address));
871 return (cp->address);
875 * Round the symbol size up to align.
877 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
878 cp = malloc(sizeof(struct common_symbol)
879 + common_size + strlen(name) + 1, M_LINKER,
881 cp->address = (caddr_t)(cp + 1);
882 cp->name = cp->address + common_size;
883 strcpy(cp->name, name);
884 bzero(cp->address, common_size);
885 STAILQ_INSERT_TAIL(&file->common, cp, link);
887 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
888 " value=%p\n", cp->address));
889 return (cp->address);
891 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
896 * Both DDB and stack(9) rely on the kernel linker to provide forward and
897 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
898 * do this in a lockfree manner. We provide a set of internal helper
899 * routines to perform these operations without locks, and then wrappers that
902 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
906 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
910 TAILQ_FOREACH(lf, &linker_files, link) {
911 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
919 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
922 c_linker_sym_t best, es;
923 u_long diff, bestdiff, off;
926 off = (uintptr_t)value;
928 TAILQ_FOREACH(lf, &linker_files, link) {
929 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
931 if (es != 0 && diff < bestdiff) {
950 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
954 TAILQ_FOREACH(lf, &linker_files, link) {
955 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
962 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
965 linker_symval_t symval;
970 error = linker_debug_search_symbol(value, &sym, offset);
973 error = linker_debug_symbol_values(sym, &symval);
976 strlcpy(buf, symval.name, buflen);
981 * DDB Helpers. DDB has to look across multiple files with their own symbol
982 * tables and string tables.
984 * Note that we do not obey list locking protocols here. We really don't need
985 * DDB to hang because somebody's got the lock held. We'll take the chance
986 * that the files list is inconsistent instead.
990 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
993 return (linker_debug_lookup(symstr, sym));
998 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
1001 return (linker_debug_search_symbol(value, sym, diffp));
1005 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1008 return (linker_debug_symbol_values(sym, symval));
1012 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1016 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1020 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1021 * obey locking protocols, and offer a significantly less complex interface.
1024 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1030 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1031 sx_sunlock(&kld_sx);
1039 kern_kldload(struct thread *td, const char *file, int *fileid)
1041 const char *kldname, *modname;
1045 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1048 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1052 * It is possible that kldloaded module will attach a new ifnet,
1053 * so vnet context must be set when this ocurs.
1055 CURVNET_SET(TD_TO_VNET(td));
1058 * If file does not contain a qualified name or any dot in it
1059 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1062 if (strchr(file, '/') || strchr(file, '.')) {
1071 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1073 sx_xunlock(&kld_sx);
1079 sx_xunlock(&kld_sx);
1087 sys_kldload(struct thread *td, struct kldload_args *uap)
1089 char *pathname = NULL;
1092 td->td_retval[0] = -1;
1094 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1095 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1097 error = kern_kldload(td, pathname, &fileid);
1099 td->td_retval[0] = fileid;
1101 free(pathname, M_TEMP);
1106 kern_kldunload(struct thread *td, int fileid, int flags)
1111 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1114 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1117 CURVNET_SET(TD_TO_VNET(td));
1119 lf = linker_find_file_by_id(fileid);
1121 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1123 if (lf->userrefs == 0) {
1125 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1127 printf("kldunload: attempt to unload file that was"
1128 " loaded by the kernel\n");
1132 error = linker_file_unload(lf, flags);
1138 sx_xunlock(&kld_sx);
1145 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1148 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1152 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1155 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1156 uap->flags != LINKER_UNLOAD_FORCE)
1158 return (kern_kldunload(td, uap->fileid, uap->flags));
1162 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1165 const char *filename;
1170 error = mac_kld_check_stat(td->td_ucred);
1175 td->td_retval[0] = -1;
1177 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1178 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1181 filename = linker_basename(pathname);
1183 lf = linker_find_file_by_name(filename);
1185 td->td_retval[0] = lf->id;
1188 sx_xunlock(&kld_sx);
1190 free(pathname, M_TEMP);
1195 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1201 error = mac_kld_check_stat(td->td_ucred);
1207 if (uap->fileid == 0)
1208 lf = TAILQ_FIRST(&linker_files);
1210 lf = linker_find_file_by_id(uap->fileid);
1215 lf = TAILQ_NEXT(lf, link);
1218 /* Skip partially loaded files. */
1219 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1220 lf = TAILQ_NEXT(lf, link);
1223 td->td_retval[0] = lf->id;
1225 td->td_retval[0] = 0;
1227 sx_xunlock(&kld_sx);
1232 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1234 struct kld_file_stat *stat;
1238 * Check the version of the user's structure.
1240 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1243 if (version != sizeof(struct kld_file_stat_1) &&
1244 version != sizeof(struct kld_file_stat))
1247 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1248 error = kern_kldstat(td, uap->fileid, stat);
1250 error = copyout(stat, uap->stat, version);
1256 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1263 error = mac_kld_check_stat(td->td_ucred);
1269 lf = linker_find_file_by_id(fileid);
1271 sx_xunlock(&kld_sx);
1275 /* Version 1 fields: */
1276 namelen = strlen(lf->filename) + 1;
1277 if (namelen > sizeof(stat->name))
1278 namelen = sizeof(stat->name);
1279 bcopy(lf->filename, &stat->name[0], namelen);
1280 stat->refs = lf->refs;
1282 stat->address = lf->address;
1283 stat->size = lf->size;
1284 /* Version 2 fields: */
1285 namelen = strlen(lf->pathname) + 1;
1286 if (namelen > sizeof(stat->pathname))
1287 namelen = sizeof(stat->pathname);
1288 bcopy(lf->pathname, &stat->pathname[0], namelen);
1289 sx_xunlock(&kld_sx);
1291 td->td_retval[0] = 0;
1296 DB_COMMAND(kldstat, db_kldstat)
1300 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1301 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1302 #undef POINTER_WIDTH
1303 TAILQ_FOREACH(lf, &linker_files, link) {
1306 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1307 lf->address, lf->size, lf->filename);
1313 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1320 error = mac_kld_check_stat(td->td_ucred);
1326 lf = linker_find_file_by_id(uap->fileid);
1329 mp = TAILQ_FIRST(&lf->modules);
1331 td->td_retval[0] = module_getid(mp);
1333 td->td_retval[0] = 0;
1337 sx_xunlock(&kld_sx);
1342 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1344 char *symstr = NULL;
1346 linker_symval_t symval;
1348 struct kld_sym_lookup lookup;
1352 error = mac_kld_check_stat(td->td_ucred);
1357 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1359 if (lookup.version != sizeof(lookup) ||
1360 uap->cmd != KLDSYM_LOOKUP)
1362 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1363 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1366 if (uap->fileid != 0) {
1367 lf = linker_find_file_by_id(uap->fileid);
1370 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1371 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1372 lookup.symvalue = (uintptr_t) symval.value;
1373 lookup.symsize = symval.size;
1374 error = copyout(&lookup, uap->data, sizeof(lookup));
1378 TAILQ_FOREACH(lf, &linker_files, link) {
1379 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1380 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1381 lookup.symvalue = (uintptr_t)symval.value;
1382 lookup.symsize = symval.size;
1383 error = copyout(&lookup, uap->data,
1391 sx_xunlock(&kld_sx);
1393 free(symstr, M_TEMP);
1398 * Preloaded module support
1402 modlist_lookup(const char *name, int ver)
1406 TAILQ_FOREACH(mod, &found_modules, link) {
1407 if (strcmp(mod->name, name) == 0 &&
1408 (ver == 0 || mod->version == ver))
1415 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1417 modlist_t mod, bestmod;
1420 if (verinfo == NULL)
1421 return (modlist_lookup(name, 0));
1423 TAILQ_FOREACH(mod, &found_modules, link) {
1424 if (strcmp(mod->name, name) != 0)
1427 if (ver == verinfo->md_ver_preferred)
1429 if (ver >= verinfo->md_ver_minimum &&
1430 ver <= verinfo->md_ver_maximum &&
1431 (bestmod == NULL || ver > bestmod->version))
1438 modlist_newmodule(const char *modname, int version, linker_file_t container)
1442 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1444 panic("no memory for module list");
1445 mod->container = container;
1446 mod->name = modname;
1447 mod->version = version;
1448 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1453 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1454 struct mod_metadata **stop, int preload)
1456 struct mod_metadata *mp, **mdp;
1457 const char *modname;
1460 for (mdp = start; mdp < stop; mdp++) {
1462 if (mp->md_type != MDT_VERSION)
1464 modname = mp->md_cval;
1465 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1466 if (modlist_lookup(modname, ver) != NULL) {
1467 printf("module %s already present!\n", modname);
1468 /* XXX what can we do? this is a build error. :-( */
1471 modlist_newmodule(modname, ver, lf);
1476 linker_preload(void *arg)
1479 const char *modname, *nmodname;
1481 linker_file_t lf, nlf;
1484 linker_file_list_t loaded_files;
1485 linker_file_list_t depended_files;
1486 struct mod_metadata *mp, *nmp;
1487 struct mod_metadata **start, **stop, **mdp, **nmdp;
1488 const struct mod_depend *verinfo;
1492 struct sysinit **si_start, **si_stop;
1494 TAILQ_INIT(&loaded_files);
1495 TAILQ_INIT(&depended_files);
1496 TAILQ_INIT(&found_modules);
1501 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1502 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1503 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1504 if (modname == NULL) {
1505 printf("Preloaded module at %p does not have a"
1506 " name!\n", modptr);
1509 if (modtype == NULL) {
1510 printf("Preloaded module at %p does not have a type!\n",
1515 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1518 TAILQ_FOREACH(lc, &classes, link) {
1519 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1525 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1529 * First get a list of stuff in the kernel.
1531 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1533 linker_addmodules(linker_kernel_file, start, stop, 1);
1536 * This is a once-off kinky bubble sort to resolve relocation
1537 * dependency requirements.
1540 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1541 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1544 * First, look to see if we would successfully link with this
1547 resolves = 1; /* unless we know otherwise */
1549 for (mdp = start; mdp < stop; mdp++) {
1551 if (mp->md_type != MDT_DEPEND)
1553 modname = mp->md_cval;
1554 verinfo = mp->md_data;
1555 for (nmdp = start; nmdp < stop; nmdp++) {
1557 if (nmp->md_type != MDT_VERSION)
1559 nmodname = nmp->md_cval;
1560 if (strcmp(modname, nmodname) == 0)
1563 if (nmdp < stop) /* it's a self reference */
1567 * ok, the module isn't here yet, we
1570 if (modlist_lookup2(modname, verinfo) == NULL)
1575 * OK, if we found our modules, we can link. So, "provide"
1576 * the modules inside and add it to the end of the link order
1581 for (mdp = start; mdp < stop; mdp++) {
1583 if (mp->md_type != MDT_VERSION)
1585 modname = mp->md_cval;
1586 nver = ((const struct mod_version *)
1587 mp->md_data)->mv_version;
1588 if (modlist_lookup(modname,
1590 printf("module %s already"
1591 " present!\n", modname);
1592 TAILQ_REMOVE(&loaded_files,
1594 linker_file_unload(lf,
1595 LINKER_UNLOAD_FORCE);
1596 /* we changed tailq next ptr */
1599 modlist_newmodule(modname, nver, lf);
1602 TAILQ_REMOVE(&loaded_files, lf, loaded);
1603 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1605 * Since we provided modules, we need to restart the
1606 * sort so that the previous files that depend on us
1607 * have a chance. Also, we've busted the tailq next
1608 * pointer with the REMOVE.
1615 * At this point, we check to see what could not be resolved..
1617 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1618 TAILQ_REMOVE(&loaded_files, lf, loaded);
1619 printf("KLD file %s is missing dependencies\n", lf->filename);
1620 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1624 * We made it. Finish off the linking in the order we determined.
1626 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1627 if (linker_kernel_file) {
1628 linker_kernel_file->refs++;
1629 error = linker_file_add_dependency(lf,
1630 linker_kernel_file);
1632 panic("cannot add dependency");
1634 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1637 for (mdp = start; mdp < stop; mdp++) {
1639 if (mp->md_type != MDT_DEPEND)
1641 modname = mp->md_cval;
1642 verinfo = mp->md_data;
1643 mod = modlist_lookup2(modname, verinfo);
1645 printf("KLD file %s - cannot find "
1646 "dependency \"%s\"\n",
1647 lf->filename, modname);
1650 /* Don't count self-dependencies */
1651 if (lf == mod->container)
1653 mod->container->refs++;
1654 error = linker_file_add_dependency(lf,
1657 panic("cannot add dependency");
1661 * Now do relocation etc using the symbol search paths
1662 * established by the dependencies
1664 error = LINKER_LINK_PRELOAD_FINISH(lf);
1666 printf("KLD file %s - could not finalize loading\n",
1670 linker_file_register_modules(lf);
1671 if (!TAILQ_EMPTY(&lf->modules))
1672 lf->flags |= LINKER_FILE_MODULES;
1673 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1674 &si_stop, NULL) == 0)
1675 sysinit_add(si_start, si_stop);
1676 linker_file_register_sysctls(lf, true);
1677 lf->flags |= LINKER_FILE_LINKED;
1680 TAILQ_REMOVE(&depended_files, lf, loaded);
1681 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1683 sx_xunlock(&kld_sx);
1684 /* woohoo! we made it! */
1687 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1690 * Handle preload files that failed to load any modules.
1693 linker_preload_finish(void *arg)
1695 linker_file_t lf, nlf;
1698 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
1700 * If all of the modules in this file failed to load, unload
1701 * the file and return an error of ENOEXEC. (Parity with
1702 * linker_load_file.)
1704 if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
1705 TAILQ_EMPTY(&lf->modules)) {
1706 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1710 lf->flags &= ~LINKER_FILE_MODULES;
1711 lf->userrefs++; /* so we can (try to) kldunload it */
1713 sx_xunlock(&kld_sx);
1717 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
1718 * scheduled at any subsystem and order, so run this as late as possible. init
1719 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
1721 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
1722 linker_preload_finish, 0);
1725 * Search for a not-loaded module by name.
1727 * Modules may be found in the following locations:
1729 * - preloaded (result is just the module name) - on disk (result is full path
1732 * If the module name is qualified in any way (contains path, etc.) the we
1733 * simply return a copy of it.
1735 * The search path can be manipulated via sysctl. Note that we use the ';'
1736 * character as a separator to be consistent with the bootloader.
1739 static char linker_hintfile[] = "linker.hints";
1740 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1742 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1743 sizeof(linker_path), "module load search path");
1745 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1747 static char *linker_ext_list[] = {
1754 * Check if file actually exists either with or without extension listed in
1755 * the linker_ext_list. (probably should be generic for the rest of the
1759 linker_lookup_file(const char *path, int pathlen, const char *name,
1760 int namelen, struct vattr *vap)
1762 struct nameidata nd;
1763 struct thread *td = curthread; /* XXX */
1764 char *result, **cpp, *sep;
1765 int error, len, extlen, reclen, flags;
1769 for (cpp = linker_ext_list; *cpp; cpp++) {
1774 extlen++; /* trailing '\0' */
1775 sep = (path[pathlen - 1] != '/') ? "/" : "";
1777 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1778 result = malloc(reclen, M_LINKER, M_WAITOK);
1779 for (cpp = linker_ext_list; *cpp; cpp++) {
1780 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1781 namelen, name, *cpp);
1783 * Attempt to open the file, and return the path if
1784 * we succeed and it's a regular file.
1786 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1788 error = vn_open(&nd, &flags, 0, NULL);
1790 NDFREE(&nd, NDF_ONLY_PNBUF);
1791 type = nd.ni_vp->v_type;
1793 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1794 VOP_UNLOCK(nd.ni_vp, 0);
1795 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1800 free(result, M_LINKER);
1804 #define INT_ALIGN(base, ptr) ptr = \
1805 (base) + roundup2((ptr) - (base), sizeof(int))
1808 * Lookup KLD which contains requested module in the "linker.hints" file. If
1809 * version specification is available, then try to find the best KLD.
1810 * Otherwise just find the latest one.
1813 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1814 int modnamelen, const struct mod_depend *verinfo)
1816 struct thread *td = curthread; /* XXX */
1817 struct ucred *cred = td ? td->td_ucred : NULL;
1818 struct nameidata nd;
1819 struct vattr vattr, mattr;
1820 u_char *hints = NULL;
1821 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1822 int error, ival, bestver, *intp, found, flags, clen, blen;
1826 bestver = found = 0;
1828 sep = (path[pathlen - 1] != '/') ? "/" : "";
1829 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1831 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1832 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1835 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1837 error = vn_open(&nd, &flags, 0, NULL);
1840 NDFREE(&nd, NDF_ONLY_PNBUF);
1841 if (nd.ni_vp->v_type != VREG)
1844 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1848 * XXX: we need to limit this number to some reasonable value
1850 if (vattr.va_size > LINKER_HINTS_MAX) {
1851 printf("hints file too large %ld\n", (long)vattr.va_size);
1854 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1855 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1856 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1859 VOP_UNLOCK(nd.ni_vp, 0);
1860 vn_close(nd.ni_vp, FREAD, cred, td);
1863 printf("can't read %zd\n", reclen);
1866 intp = (int *)hints;
1868 if (ival != LINKER_HINTS_VERSION) {
1869 printf("hints file version mismatch %d\n", ival);
1872 bufend = hints + vattr.va_size;
1873 recptr = (u_char *)intp;
1875 while (recptr < bufend && !found) {
1876 intp = (int *)recptr;
1883 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1886 INT_ALIGN(hints, cp);
1890 if (verinfo == NULL ||
1891 ival == verinfo->md_ver_preferred) {
1895 if (ival >= verinfo->md_ver_minimum &&
1896 ival <= verinfo->md_ver_maximum &&
1906 recptr += reclen + sizeof(int);
1909 * Finally check if KLD is in the place
1912 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1914 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1917 * KLD is newer than hints file. What we should do now?
1919 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1920 printf("warning: KLD '%s' is newer than the linker.hints"
1923 free(pathbuf, M_LINKER);
1925 free(hints, M_TEMP);
1926 if (nd.ni_vp != NULL) {
1927 VOP_UNLOCK(nd.ni_vp, 0);
1928 vn_close(nd.ni_vp, FREAD, cred, td);
1931 * If nothing found or hints is absent - fallback to the old
1932 * way by using "kldname[.ko]" as module name.
1934 if (!found && !bestver && result == NULL)
1935 result = linker_lookup_file(path, pathlen, modname,
1941 * Lookup KLD which contains requested module in the all directories.
1944 linker_search_module(const char *modname, int modnamelen,
1945 const struct mod_depend *verinfo)
1947 char *cp, *ep, *result;
1950 * traverse the linker path
1952 for (cp = linker_path; *cp; cp = ep + 1) {
1953 /* find the end of this component */
1954 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1955 result = linker_hints_lookup(cp, ep - cp, modname,
1956 modnamelen, verinfo);
1966 * Search for module in all directories listed in the linker_path.
1969 linker_search_kld(const char *name)
1971 char *cp, *ep, *result;
1974 /* qualified at all? */
1975 if (strchr(name, '/'))
1976 return (strdup(name, M_LINKER));
1978 /* traverse the linker path */
1980 for (ep = linker_path; *ep; ep++) {
1982 /* find the end of this component */
1983 for (; *ep != 0 && *ep != ';'; ep++);
1984 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1992 linker_basename(const char *path)
1994 const char *filename;
1996 filename = strrchr(path, '/');
1997 if (filename == NULL)
2006 * Inform hwpmc about the set of kernel modules currently loaded.
2009 linker_hwpmc_list_objects(void)
2012 struct pmckern_map_in *kobase;
2017 TAILQ_FOREACH(lf, &linker_files, link)
2020 /* Allocate nmappings + 1 entries. */
2021 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
2022 M_LINKER, M_WAITOK | M_ZERO);
2024 TAILQ_FOREACH(lf, &linker_files, link) {
2026 /* Save the info for this linker file. */
2027 kobase[i].pm_file = lf->filename;
2028 kobase[i].pm_address = (uintptr_t)lf->address;
2031 sx_sunlock(&kld_sx);
2033 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
2035 /* The last entry of the malloced area comprises of all zeros. */
2036 KASSERT(kobase[i].pm_file == NULL,
2037 ("linker_hwpmc_list_objects: last object not NULL"));
2039 return ((void *)kobase);
2044 * Find a file which contains given module and load it, if "parent" is not
2045 * NULL, register a reference to it.
2048 linker_load_module(const char *kldname, const char *modname,
2049 struct linker_file *parent, const struct mod_depend *verinfo,
2050 struct linker_file **lfpp)
2052 linker_file_t lfdep;
2053 const char *filename;
2057 sx_assert(&kld_sx, SA_XLOCKED);
2058 if (modname == NULL) {
2060 * We have to load KLD
2062 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2064 pathname = linker_search_kld(kldname);
2066 if (modlist_lookup2(modname, verinfo) != NULL)
2068 if (kldname != NULL)
2069 pathname = strdup(kldname, M_LINKER);
2070 else if (rootvnode == NULL)
2074 * Need to find a KLD with required module
2076 pathname = linker_search_module(modname,
2077 strlen(modname), verinfo);
2079 if (pathname == NULL)
2083 * Can't load more than one file with the same basename XXX:
2084 * Actually it should be possible to have multiple KLDs with
2085 * the same basename but different path because they can
2086 * provide different versions of the same modules.
2088 filename = linker_basename(pathname);
2089 if (linker_find_file_by_name(filename))
2092 error = linker_load_file(pathname, &lfdep);
2095 if (modname && verinfo &&
2096 modlist_lookup2(modname, verinfo) == NULL) {
2097 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2102 error = linker_file_add_dependency(parent, lfdep);
2109 free(pathname, M_LINKER);
2114 * This routine is responsible for finding dependencies of userland initiated
2115 * kldload(2)'s of files.
2118 linker_load_dependencies(linker_file_t lf)
2120 linker_file_t lfdep;
2121 struct mod_metadata **start, **stop, **mdp, **nmdp;
2122 struct mod_metadata *mp, *nmp;
2123 const struct mod_depend *verinfo;
2125 const char *modname, *nmodname;
2126 int ver, error = 0, count;
2129 * All files are dependent on /kernel.
2131 sx_assert(&kld_sx, SA_XLOCKED);
2132 if (linker_kernel_file) {
2133 linker_kernel_file->refs++;
2134 error = linker_file_add_dependency(lf, linker_kernel_file);
2138 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2141 for (mdp = start; mdp < stop; mdp++) {
2143 if (mp->md_type != MDT_VERSION)
2145 modname = mp->md_cval;
2146 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2147 mod = modlist_lookup(modname, ver);
2149 printf("interface %s.%d already present in the KLD"
2150 " '%s'!\n", modname, ver,
2151 mod->container->filename);
2156 for (mdp = start; mdp < stop; mdp++) {
2158 if (mp->md_type != MDT_DEPEND)
2160 modname = mp->md_cval;
2161 verinfo = mp->md_data;
2163 for (nmdp = start; nmdp < stop; nmdp++) {
2165 if (nmp->md_type != MDT_VERSION)
2167 nmodname = nmp->md_cval;
2168 if (strcmp(modname, nmodname) == 0)
2171 if (nmdp < stop)/* early exit, it's a self reference */
2173 mod = modlist_lookup2(modname, verinfo);
2174 if (mod) { /* woohoo, it's loaded already */
2175 lfdep = mod->container;
2177 error = linker_file_add_dependency(lf, lfdep);
2182 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2184 printf("KLD %s: depends on %s - not available or"
2185 " version mismatch\n", lf->filename, modname);
2192 linker_addmodules(lf, start, stop, 0);
2197 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2199 struct sysctl_req *req;
2202 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2206 * Export a nul-separated, double-nul-terminated list of all function names
2210 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2216 error = mac_kld_check_stat(req->td->td_ucred);
2220 error = sysctl_wire_old_buffer(req, 0);
2224 TAILQ_FOREACH(lf, &linker_files, link) {
2225 error = LINKER_EACH_FUNCTION_NAME(lf,
2226 sysctl_kern_function_list_iterate, req);
2228 sx_xunlock(&kld_sx);
2232 sx_xunlock(&kld_sx);
2233 return (SYSCTL_OUT(req, "", 1));
2236 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2237 NULL, 0, sysctl_kern_function_list, "", "kernel function list");