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, NULL);
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_flags(caddr_t value, char *buf, u_int buflen,
1025 long *offset, int flags)
1029 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 &&
1030 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK),
1031 ("%s: bad flags: 0x%x", __func__, flags));
1033 if (flags & M_NOWAIT) {
1034 if (!sx_try_slock(&kld_sx))
1035 return (EWOULDBLOCK);
1039 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1040 sx_sunlock(&kld_sx);
1045 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1049 return (linker_search_symbol_name_flags(value, buf, buflen, offset,
1057 kern_kldload(struct thread *td, const char *file, int *fileid)
1059 const char *kldname, *modname;
1063 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1066 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1070 * It is possible that kldloaded module will attach a new ifnet,
1071 * so vnet context must be set when this ocurs.
1073 CURVNET_SET(TD_TO_VNET(td));
1076 * If file does not contain a qualified name or any dot in it
1077 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1080 if (strchr(file, '/') || strchr(file, '.')) {
1089 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1091 sx_xunlock(&kld_sx);
1097 sx_xunlock(&kld_sx);
1105 sys_kldload(struct thread *td, struct kldload_args *uap)
1107 char *pathname = NULL;
1110 td->td_retval[0] = -1;
1112 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1113 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1115 error = kern_kldload(td, pathname, &fileid);
1117 td->td_retval[0] = fileid;
1119 free(pathname, M_TEMP);
1124 kern_kldunload(struct thread *td, int fileid, int flags)
1129 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1132 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1135 CURVNET_SET(TD_TO_VNET(td));
1137 lf = linker_find_file_by_id(fileid);
1139 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1141 if (lf->userrefs == 0) {
1143 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1145 printf("kldunload: attempt to unload file that was"
1146 " loaded by the kernel\n");
1150 error = linker_file_unload(lf, flags);
1156 sx_xunlock(&kld_sx);
1163 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1166 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1170 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1173 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1174 uap->flags != LINKER_UNLOAD_FORCE)
1176 return (kern_kldunload(td, uap->fileid, uap->flags));
1180 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1183 const char *filename;
1188 error = mac_kld_check_stat(td->td_ucred);
1193 td->td_retval[0] = -1;
1195 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1196 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1199 filename = linker_basename(pathname);
1201 lf = linker_find_file_by_name(filename);
1203 td->td_retval[0] = lf->id;
1206 sx_xunlock(&kld_sx);
1208 free(pathname, M_TEMP);
1213 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1219 error = mac_kld_check_stat(td->td_ucred);
1225 if (uap->fileid == 0)
1226 lf = TAILQ_FIRST(&linker_files);
1228 lf = linker_find_file_by_id(uap->fileid);
1233 lf = TAILQ_NEXT(lf, link);
1236 /* Skip partially loaded files. */
1237 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1238 lf = TAILQ_NEXT(lf, link);
1241 td->td_retval[0] = lf->id;
1243 td->td_retval[0] = 0;
1245 sx_xunlock(&kld_sx);
1250 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1252 struct kld_file_stat *stat;
1256 * Check the version of the user's structure.
1258 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1261 if (version != sizeof(struct kld_file_stat_1) &&
1262 version != sizeof(struct kld_file_stat))
1265 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1266 error = kern_kldstat(td, uap->fileid, stat);
1268 error = copyout(stat, uap->stat, version);
1274 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1281 error = mac_kld_check_stat(td->td_ucred);
1287 lf = linker_find_file_by_id(fileid);
1289 sx_xunlock(&kld_sx);
1293 /* Version 1 fields: */
1294 namelen = strlen(lf->filename) + 1;
1295 if (namelen > sizeof(stat->name))
1296 namelen = sizeof(stat->name);
1297 bcopy(lf->filename, &stat->name[0], namelen);
1298 stat->refs = lf->refs;
1300 stat->address = lf->address;
1301 stat->size = lf->size;
1302 /* Version 2 fields: */
1303 namelen = strlen(lf->pathname) + 1;
1304 if (namelen > sizeof(stat->pathname))
1305 namelen = sizeof(stat->pathname);
1306 bcopy(lf->pathname, &stat->pathname[0], namelen);
1307 sx_xunlock(&kld_sx);
1309 td->td_retval[0] = 0;
1314 DB_COMMAND(kldstat, db_kldstat)
1318 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1319 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1320 #undef POINTER_WIDTH
1321 TAILQ_FOREACH(lf, &linker_files, link) {
1324 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1325 lf->address, lf->size, lf->filename);
1331 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1338 error = mac_kld_check_stat(td->td_ucred);
1344 lf = linker_find_file_by_id(uap->fileid);
1347 mp = TAILQ_FIRST(&lf->modules);
1349 td->td_retval[0] = module_getid(mp);
1351 td->td_retval[0] = 0;
1355 sx_xunlock(&kld_sx);
1360 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1362 char *symstr = NULL;
1364 linker_symval_t symval;
1366 struct kld_sym_lookup lookup;
1370 error = mac_kld_check_stat(td->td_ucred);
1375 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1377 if (lookup.version != sizeof(lookup) ||
1378 uap->cmd != KLDSYM_LOOKUP)
1380 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1381 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1384 if (uap->fileid != 0) {
1385 lf = linker_find_file_by_id(uap->fileid);
1388 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1389 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1390 lookup.symvalue = (uintptr_t) symval.value;
1391 lookup.symsize = symval.size;
1392 error = copyout(&lookup, uap->data, sizeof(lookup));
1396 TAILQ_FOREACH(lf, &linker_files, link) {
1397 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1398 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1399 lookup.symvalue = (uintptr_t)symval.value;
1400 lookup.symsize = symval.size;
1401 error = copyout(&lookup, uap->data,
1409 sx_xunlock(&kld_sx);
1411 free(symstr, M_TEMP);
1416 * Preloaded module support
1420 modlist_lookup(const char *name, int ver)
1424 TAILQ_FOREACH(mod, &found_modules, link) {
1425 if (strcmp(mod->name, name) == 0 &&
1426 (ver == 0 || mod->version == ver))
1433 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1435 modlist_t mod, bestmod;
1438 if (verinfo == NULL)
1439 return (modlist_lookup(name, 0));
1441 TAILQ_FOREACH(mod, &found_modules, link) {
1442 if (strcmp(mod->name, name) != 0)
1445 if (ver == verinfo->md_ver_preferred)
1447 if (ver >= verinfo->md_ver_minimum &&
1448 ver <= verinfo->md_ver_maximum &&
1449 (bestmod == NULL || ver > bestmod->version))
1456 modlist_newmodule(const char *modname, int version, linker_file_t container)
1460 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1462 panic("no memory for module list");
1463 mod->container = container;
1464 mod->name = modname;
1465 mod->version = version;
1466 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1471 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1472 struct mod_metadata **stop, int preload)
1474 struct mod_metadata *mp, **mdp;
1475 const char *modname;
1478 for (mdp = start; mdp < stop; mdp++) {
1480 if (mp->md_type != MDT_VERSION)
1482 modname = mp->md_cval;
1483 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1484 if (modlist_lookup(modname, ver) != NULL) {
1485 printf("module %s already present!\n", modname);
1486 /* XXX what can we do? this is a build error. :-( */
1489 modlist_newmodule(modname, ver, lf);
1494 linker_preload(void *arg)
1497 const char *modname, *nmodname;
1499 linker_file_t lf, nlf;
1502 linker_file_list_t loaded_files;
1503 linker_file_list_t depended_files;
1504 struct mod_metadata *mp, *nmp;
1505 struct mod_metadata **start, **stop, **mdp, **nmdp;
1506 const struct mod_depend *verinfo;
1510 struct sysinit **si_start, **si_stop;
1512 TAILQ_INIT(&loaded_files);
1513 TAILQ_INIT(&depended_files);
1514 TAILQ_INIT(&found_modules);
1519 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1520 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1521 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1522 if (modname == NULL) {
1523 printf("Preloaded module at %p does not have a"
1524 " name!\n", modptr);
1527 if (modtype == NULL) {
1528 printf("Preloaded module at %p does not have a type!\n",
1533 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1536 TAILQ_FOREACH(lc, &classes, link) {
1537 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1543 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1547 * First get a list of stuff in the kernel.
1549 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1551 linker_addmodules(linker_kernel_file, start, stop, 1);
1554 * This is a once-off kinky bubble sort to resolve relocation
1555 * dependency requirements.
1558 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1559 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1562 * First, look to see if we would successfully link with this
1565 resolves = 1; /* unless we know otherwise */
1567 for (mdp = start; mdp < stop; mdp++) {
1569 if (mp->md_type != MDT_DEPEND)
1571 modname = mp->md_cval;
1572 verinfo = mp->md_data;
1573 for (nmdp = start; nmdp < stop; nmdp++) {
1575 if (nmp->md_type != MDT_VERSION)
1577 nmodname = nmp->md_cval;
1578 if (strcmp(modname, nmodname) == 0)
1581 if (nmdp < stop) /* it's a self reference */
1585 * ok, the module isn't here yet, we
1588 if (modlist_lookup2(modname, verinfo) == NULL)
1593 * OK, if we found our modules, we can link. So, "provide"
1594 * the modules inside and add it to the end of the link order
1599 for (mdp = start; mdp < stop; mdp++) {
1601 if (mp->md_type != MDT_VERSION)
1603 modname = mp->md_cval;
1604 nver = ((const struct mod_version *)
1605 mp->md_data)->mv_version;
1606 if (modlist_lookup(modname,
1608 printf("module %s already"
1609 " present!\n", modname);
1610 TAILQ_REMOVE(&loaded_files,
1612 linker_file_unload(lf,
1613 LINKER_UNLOAD_FORCE);
1614 /* we changed tailq next ptr */
1617 modlist_newmodule(modname, nver, lf);
1620 TAILQ_REMOVE(&loaded_files, lf, loaded);
1621 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1623 * Since we provided modules, we need to restart the
1624 * sort so that the previous files that depend on us
1625 * have a chance. Also, we've busted the tailq next
1626 * pointer with the REMOVE.
1633 * At this point, we check to see what could not be resolved..
1635 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1636 TAILQ_REMOVE(&loaded_files, lf, loaded);
1637 printf("KLD file %s is missing dependencies\n", lf->filename);
1638 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1642 * We made it. Finish off the linking in the order we determined.
1644 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1645 if (linker_kernel_file) {
1646 linker_kernel_file->refs++;
1647 error = linker_file_add_dependency(lf,
1648 linker_kernel_file);
1650 panic("cannot add dependency");
1652 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1655 for (mdp = start; mdp < stop; mdp++) {
1657 if (mp->md_type != MDT_DEPEND)
1659 modname = mp->md_cval;
1660 verinfo = mp->md_data;
1661 mod = modlist_lookup2(modname, verinfo);
1663 printf("KLD file %s - cannot find "
1664 "dependency \"%s\"\n",
1665 lf->filename, modname);
1668 /* Don't count self-dependencies */
1669 if (lf == mod->container)
1671 mod->container->refs++;
1672 error = linker_file_add_dependency(lf,
1675 panic("cannot add dependency");
1679 * Now do relocation etc using the symbol search paths
1680 * established by the dependencies
1682 error = LINKER_LINK_PRELOAD_FINISH(lf);
1684 printf("KLD file %s - could not finalize loading\n",
1688 linker_file_register_modules(lf);
1689 if (!TAILQ_EMPTY(&lf->modules))
1690 lf->flags |= LINKER_FILE_MODULES;
1691 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1692 &si_stop, NULL) == 0)
1693 sysinit_add(si_start, si_stop);
1694 linker_file_register_sysctls(lf, true);
1695 lf->flags |= LINKER_FILE_LINKED;
1698 TAILQ_REMOVE(&depended_files, lf, loaded);
1699 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1701 sx_xunlock(&kld_sx);
1702 /* woohoo! we made it! */
1705 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL);
1708 * Handle preload files that failed to load any modules.
1711 linker_preload_finish(void *arg)
1713 linker_file_t lf, nlf;
1716 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
1718 * If all of the modules in this file failed to load, unload
1719 * the file and return an error of ENOEXEC. (Parity with
1720 * linker_load_file.)
1722 if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
1723 TAILQ_EMPTY(&lf->modules)) {
1724 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1728 lf->flags &= ~LINKER_FILE_MODULES;
1729 lf->userrefs++; /* so we can (try to) kldunload it */
1731 sx_xunlock(&kld_sx);
1735 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
1736 * scheduled at any subsystem and order, so run this as late as possible. init
1737 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
1739 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
1740 linker_preload_finish, NULL);
1743 * Search for a not-loaded module by name.
1745 * Modules may be found in the following locations:
1747 * - preloaded (result is just the module name) - on disk (result is full path
1750 * If the module name is qualified in any way (contains path, etc.) the we
1751 * simply return a copy of it.
1753 * The search path can be manipulated via sysctl. Note that we use the ';'
1754 * character as a separator to be consistent with the bootloader.
1757 static char linker_hintfile[] = "linker.hints";
1758 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1760 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1761 sizeof(linker_path), "module load search path");
1763 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1765 static char *linker_ext_list[] = {
1772 * Check if file actually exists either with or without extension listed in
1773 * the linker_ext_list. (probably should be generic for the rest of the
1777 linker_lookup_file(const char *path, int pathlen, const char *name,
1778 int namelen, struct vattr *vap)
1780 struct nameidata nd;
1781 struct thread *td = curthread; /* XXX */
1782 char *result, **cpp, *sep;
1783 int error, len, extlen, reclen, flags;
1787 for (cpp = linker_ext_list; *cpp; cpp++) {
1792 extlen++; /* trailing '\0' */
1793 sep = (path[pathlen - 1] != '/') ? "/" : "";
1795 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1796 result = malloc(reclen, M_LINKER, M_WAITOK);
1797 for (cpp = linker_ext_list; *cpp; cpp++) {
1798 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1799 namelen, name, *cpp);
1801 * Attempt to open the file, and return the path if
1802 * we succeed and it's a regular file.
1804 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1806 error = vn_open(&nd, &flags, 0, NULL);
1808 NDFREE(&nd, NDF_ONLY_PNBUF);
1809 type = nd.ni_vp->v_type;
1811 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1812 VOP_UNLOCK(nd.ni_vp, 0);
1813 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1818 free(result, M_LINKER);
1822 #define INT_ALIGN(base, ptr) ptr = \
1823 (base) + roundup2((ptr) - (base), sizeof(int))
1826 * Lookup KLD which contains requested module in the "linker.hints" file. If
1827 * version specification is available, then try to find the best KLD.
1828 * Otherwise just find the latest one.
1831 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1832 int modnamelen, const struct mod_depend *verinfo)
1834 struct thread *td = curthread; /* XXX */
1835 struct ucred *cred = td ? td->td_ucred : NULL;
1836 struct nameidata nd;
1837 struct vattr vattr, mattr;
1838 u_char *hints = NULL;
1839 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1840 int error, ival, bestver, *intp, found, flags, clen, blen;
1844 bestver = found = 0;
1846 sep = (path[pathlen - 1] != '/') ? "/" : "";
1847 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1849 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1850 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1853 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1855 error = vn_open(&nd, &flags, 0, NULL);
1858 NDFREE(&nd, NDF_ONLY_PNBUF);
1859 if (nd.ni_vp->v_type != VREG)
1862 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1866 * XXX: we need to limit this number to some reasonable value
1868 if (vattr.va_size > LINKER_HINTS_MAX) {
1869 printf("hints file too large %ld\n", (long)vattr.va_size);
1872 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1873 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1874 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1877 VOP_UNLOCK(nd.ni_vp, 0);
1878 vn_close(nd.ni_vp, FREAD, cred, td);
1881 printf("can't read %zd\n", reclen);
1884 intp = (int *)hints;
1886 if (ival != LINKER_HINTS_VERSION) {
1887 printf("hints file version mismatch %d\n", ival);
1890 bufend = hints + vattr.va_size;
1891 recptr = (u_char *)intp;
1893 while (recptr < bufend && !found) {
1894 intp = (int *)recptr;
1901 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1904 INT_ALIGN(hints, cp);
1908 if (verinfo == NULL ||
1909 ival == verinfo->md_ver_preferred) {
1913 if (ival >= verinfo->md_ver_minimum &&
1914 ival <= verinfo->md_ver_maximum &&
1924 recptr += reclen + sizeof(int);
1927 * Finally check if KLD is in the place
1930 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1932 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1935 * KLD is newer than hints file. What we should do now?
1937 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1938 printf("warning: KLD '%s' is newer than the linker.hints"
1941 free(pathbuf, M_LINKER);
1943 free(hints, M_TEMP);
1944 if (nd.ni_vp != NULL) {
1945 VOP_UNLOCK(nd.ni_vp, 0);
1946 vn_close(nd.ni_vp, FREAD, cred, td);
1949 * If nothing found or hints is absent - fallback to the old
1950 * way by using "kldname[.ko]" as module name.
1952 if (!found && !bestver && result == NULL)
1953 result = linker_lookup_file(path, pathlen, modname,
1959 * Lookup KLD which contains requested module in the all directories.
1962 linker_search_module(const char *modname, int modnamelen,
1963 const struct mod_depend *verinfo)
1965 char *cp, *ep, *result;
1968 * traverse the linker path
1970 for (cp = linker_path; *cp; cp = ep + 1) {
1971 /* find the end of this component */
1972 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1973 result = linker_hints_lookup(cp, ep - cp, modname,
1974 modnamelen, verinfo);
1984 * Search for module in all directories listed in the linker_path.
1987 linker_search_kld(const char *name)
1989 char *cp, *ep, *result;
1992 /* qualified at all? */
1993 if (strchr(name, '/'))
1994 return (strdup(name, M_LINKER));
1996 /* traverse the linker path */
1998 for (ep = linker_path; *ep; ep++) {
2000 /* find the end of this component */
2001 for (; *ep != 0 && *ep != ';'; ep++);
2002 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
2010 linker_basename(const char *path)
2012 const char *filename;
2014 filename = strrchr(path, '/');
2015 if (filename == NULL)
2024 * Inform hwpmc about the set of kernel modules currently loaded.
2027 linker_hwpmc_list_objects(void)
2030 struct pmckern_map_in *kobase;
2035 TAILQ_FOREACH(lf, &linker_files, link)
2038 /* Allocate nmappings + 1 entries. */
2039 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
2040 M_LINKER, M_WAITOK | M_ZERO);
2042 TAILQ_FOREACH(lf, &linker_files, link) {
2044 /* Save the info for this linker file. */
2045 kobase[i].pm_file = lf->filename;
2046 kobase[i].pm_address = (uintptr_t)lf->address;
2049 sx_sunlock(&kld_sx);
2051 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
2053 /* The last entry of the malloced area comprises of all zeros. */
2054 KASSERT(kobase[i].pm_file == NULL,
2055 ("linker_hwpmc_list_objects: last object not NULL"));
2057 return ((void *)kobase);
2062 * Find a file which contains given module and load it, if "parent" is not
2063 * NULL, register a reference to it.
2066 linker_load_module(const char *kldname, const char *modname,
2067 struct linker_file *parent, const struct mod_depend *verinfo,
2068 struct linker_file **lfpp)
2070 linker_file_t lfdep;
2071 const char *filename;
2075 sx_assert(&kld_sx, SA_XLOCKED);
2076 if (modname == NULL) {
2078 * We have to load KLD
2080 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2082 pathname = linker_search_kld(kldname);
2084 if (modlist_lookup2(modname, verinfo) != NULL)
2086 if (kldname != NULL)
2087 pathname = strdup(kldname, M_LINKER);
2088 else if (rootvnode == NULL)
2092 * Need to find a KLD with required module
2094 pathname = linker_search_module(modname,
2095 strlen(modname), verinfo);
2097 if (pathname == NULL)
2101 * Can't load more than one file with the same basename XXX:
2102 * Actually it should be possible to have multiple KLDs with
2103 * the same basename but different path because they can
2104 * provide different versions of the same modules.
2106 filename = linker_basename(pathname);
2107 if (linker_find_file_by_name(filename))
2110 error = linker_load_file(pathname, &lfdep);
2113 if (modname && verinfo &&
2114 modlist_lookup2(modname, verinfo) == NULL) {
2115 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2120 error = linker_file_add_dependency(parent, lfdep);
2127 free(pathname, M_LINKER);
2132 * This routine is responsible for finding dependencies of userland initiated
2133 * kldload(2)'s of files.
2136 linker_load_dependencies(linker_file_t lf)
2138 linker_file_t lfdep;
2139 struct mod_metadata **start, **stop, **mdp, **nmdp;
2140 struct mod_metadata *mp, *nmp;
2141 const struct mod_depend *verinfo;
2143 const char *modname, *nmodname;
2147 * All files are dependent on /kernel.
2149 sx_assert(&kld_sx, SA_XLOCKED);
2150 if (linker_kernel_file) {
2151 linker_kernel_file->refs++;
2152 error = linker_file_add_dependency(lf, linker_kernel_file);
2156 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2159 for (mdp = start; mdp < stop; mdp++) {
2161 if (mp->md_type != MDT_VERSION)
2163 modname = mp->md_cval;
2164 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2165 mod = modlist_lookup(modname, ver);
2167 printf("interface %s.%d already present in the KLD"
2168 " '%s'!\n", modname, ver,
2169 mod->container->filename);
2174 for (mdp = start; mdp < stop; mdp++) {
2176 if (mp->md_type != MDT_DEPEND)
2178 modname = mp->md_cval;
2179 verinfo = mp->md_data;
2181 for (nmdp = start; nmdp < stop; nmdp++) {
2183 if (nmp->md_type != MDT_VERSION)
2185 nmodname = nmp->md_cval;
2186 if (strcmp(modname, nmodname) == 0)
2189 if (nmdp < stop)/* early exit, it's a self reference */
2191 mod = modlist_lookup2(modname, verinfo);
2192 if (mod) { /* woohoo, it's loaded already */
2193 lfdep = mod->container;
2195 error = linker_file_add_dependency(lf, lfdep);
2200 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2202 printf("KLD %s: depends on %s - not available or"
2203 " version mismatch\n", lf->filename, modname);
2210 linker_addmodules(lf, start, stop, 0);
2215 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2217 struct sysctl_req *req;
2220 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2224 * Export a nul-separated, double-nul-terminated list of all function names
2228 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2234 error = mac_kld_check_stat(req->td->td_ucred);
2238 error = sysctl_wire_old_buffer(req, 0);
2242 TAILQ_FOREACH(lf, &linker_files, link) {
2243 error = LINKER_EACH_FUNCTION_NAME(lf,
2244 sysctl_kern_function_list_iterate, req);
2246 sx_xunlock(&kld_sx);
2250 sx_xunlock(&kld_sx);
2251 return (SYSCTL_OUT(req, "", 1));
2254 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2255 NULL, 0, sysctl_kern_function_list, "", "kernel function list");