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; \
136 /* XXX wrong name; we're looking at version provision tags here, not modules */
137 typedef TAILQ_HEAD(, modlist) modlisthead_t;
139 TAILQ_ENTRY(modlist) link; /* chain together all modules */
140 linker_file_t container;
144 typedef struct modlist *modlist_t;
145 static modlisthead_t found_modules;
147 static int linker_file_add_dependency(linker_file_t file,
149 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
150 const char* name, int deps);
151 static int linker_load_module(const char *kldname,
152 const char *modname, struct linker_file *parent,
153 const struct mod_depend *verinfo, struct linker_file **lfpp);
154 static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
157 linker_init(void *arg)
160 sx_init(&kld_sx, "kernel linker");
161 TAILQ_INIT(&classes);
162 TAILQ_INIT(&linker_files);
165 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, NULL);
168 linker_stop_class_add(void *arg)
171 linker_no_more_classes = 1;
174 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
177 linker_add_class(linker_class_t lc)
181 * We disallow any class registration past SI_ORDER_ANY
182 * of SI_SUB_KLD. We bump the reference count to keep the
183 * ops from being freed.
185 if (linker_no_more_classes == 1)
187 kobj_class_compile((kobj_class_t) lc);
188 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
189 TAILQ_INSERT_TAIL(&classes, lc, link);
194 linker_file_sysinit(linker_file_t lf)
196 struct sysinit **start, **stop, **sipp, **xipp, *save;
198 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
201 sx_assert(&kld_sx, SA_XLOCKED);
203 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
206 * Perform a bubble sort of the system initialization objects by
207 * their subsystem (primary key) and order (secondary key).
209 * Since some things care about execution order, this is the operation
210 * which ensures continued function.
212 for (sipp = start; sipp < stop; sipp++) {
213 for (xipp = sipp + 1; xipp < stop; xipp++) {
214 if ((*sipp)->subsystem < (*xipp)->subsystem ||
215 ((*sipp)->subsystem == (*xipp)->subsystem &&
216 (*sipp)->order <= (*xipp)->order))
225 * Traverse the (now) ordered list of system initialization tasks.
226 * Perform each task, and continue on to the next task.
230 for (sipp = start; sipp < stop; sipp++) {
231 if ((*sipp)->subsystem == SI_SUB_DUMMY)
232 continue; /* skip dummy task(s) */
235 (*((*sipp)->func)) ((*sipp)->udata);
242 linker_file_sysuninit(linker_file_t lf)
244 struct sysinit **start, **stop, **sipp, **xipp, *save;
246 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
249 sx_assert(&kld_sx, SA_XLOCKED);
251 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
256 * Perform a reverse bubble sort of the system initialization objects
257 * by their subsystem (primary key) and order (secondary key).
259 * Since some things care about execution order, this is the operation
260 * which ensures continued function.
262 for (sipp = start; sipp < stop; sipp++) {
263 for (xipp = sipp + 1; xipp < stop; xipp++) {
264 if ((*sipp)->subsystem > (*xipp)->subsystem ||
265 ((*sipp)->subsystem == (*xipp)->subsystem &&
266 (*sipp)->order >= (*xipp)->order))
275 * Traverse the (now) ordered list of system initialization tasks.
276 * Perform each task, and continue on to the next task.
280 for (sipp = start; sipp < stop; sipp++) {
281 if ((*sipp)->subsystem == SI_SUB_DUMMY)
282 continue; /* skip dummy task(s) */
285 (*((*sipp)->func)) ((*sipp)->udata);
292 linker_file_register_sysctls(linker_file_t lf, bool enable)
294 struct sysctl_oid **start, **stop, **oidp;
297 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
300 sx_assert(&kld_sx, SA_XLOCKED);
302 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
307 for (oidp = start; oidp < stop; oidp++) {
309 sysctl_register_oid(*oidp);
311 sysctl_register_disabled_oid(*oidp);
318 linker_file_enable_sysctls(linker_file_t lf)
320 struct sysctl_oid **start, **stop, **oidp;
323 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n",
326 sx_assert(&kld_sx, SA_XLOCKED);
328 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
333 for (oidp = start; oidp < stop; oidp++)
334 sysctl_enable_oid(*oidp);
340 linker_file_unregister_sysctls(linker_file_t lf)
342 struct sysctl_oid **start, **stop, **oidp;
344 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
345 " for %s\n", lf->filename));
347 sx_assert(&kld_sx, SA_XLOCKED);
349 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
354 for (oidp = start; oidp < stop; oidp++)
355 sysctl_unregister_oid(*oidp);
361 linker_file_register_modules(linker_file_t lf)
363 struct mod_metadata **start, **stop, **mdp;
364 const moduledata_t *moddata;
365 int first_error, error;
367 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
368 " in %s\n", lf->filename));
370 sx_assert(&kld_sx, SA_XLOCKED);
372 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, NULL) != 0) {
374 * This fallback should be unnecessary, but if we get booted
375 * from boot2 instead of loader and we are missing our
376 * metadata then we have to try the best we can.
378 if (lf == linker_kernel_file) {
379 start = SET_BEGIN(modmetadata_set);
380 stop = SET_LIMIT(modmetadata_set);
385 for (mdp = start; mdp < stop; mdp++) {
386 if ((*mdp)->md_type != MDT_MODULE)
388 moddata = (*mdp)->md_data;
389 KLD_DPF(FILE, ("Registering module %s in %s\n",
390 moddata->name, lf->filename));
391 error = module_register(moddata, lf);
393 printf("Module %s failed to register: %d\n",
394 moddata->name, error);
395 if (first_error == 0)
399 return (first_error);
403 linker_init_kernel_modules(void)
407 linker_file_register_modules(linker_kernel_file);
411 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
415 linker_load_file(const char *filename, linker_file_t *result)
419 int foundfile, error, modules;
421 /* Refuse to load modules if securelevel raised */
422 if (prison0.pr_securelevel > 0)
425 sx_assert(&kld_sx, SA_XLOCKED);
426 lf = linker_find_file_by_name(filename);
428 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
429 " incrementing refs\n", filename));
438 * We do not need to protect (lock) classes here because there is
439 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
440 * and there is no class deregistration mechanism at this time.
442 TAILQ_FOREACH(lc, &classes, link) {
443 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
445 error = LINKER_LOAD_FILE(lc, filename, &lf);
447 * If we got something other than ENOENT, then it exists but
448 * we cannot load it for some other reason.
453 error = linker_file_register_modules(lf);
454 if (error == EEXIST) {
455 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
458 modules = !TAILQ_EMPTY(&lf->modules);
459 linker_file_register_sysctls(lf, false);
460 linker_file_sysinit(lf);
461 lf->flags |= LINKER_FILE_LINKED;
464 * If all of the modules in this file failed
465 * to load, unload the file and return an
468 if (modules && TAILQ_EMPTY(&lf->modules)) {
469 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
472 linker_file_enable_sysctls(lf);
473 EVENTHANDLER_INVOKE(kld_load, lf);
479 * Less than ideal, but tells the user whether it failed to load or
480 * the module was not found.
485 * If the file type has not been recognized by the last try
486 * printout a message before to fail.
489 printf("%s: %s - unsupported file type\n",
493 * Format not recognized or otherwise unloadable.
494 * When loading a module that is statically built into
495 * the kernel EEXIST percolates back up as the return
496 * value. Preserve this so that apps like sysinstall
497 * can recognize this special case and not post bogus
503 error = ENOENT; /* Nothing found */
508 linker_reference_module(const char *modname, struct mod_depend *verinfo,
509 linker_file_t *result)
515 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
516 *result = mod->container;
522 error = linker_load_module(NULL, modname, NULL, verinfo, result);
528 linker_release_module(const char *modname, struct mod_depend *verinfo,
536 KASSERT(modname != NULL,
537 ("linker_release_module: no file or name"));
538 mod = modlist_lookup2(modname, verinfo);
545 KASSERT(modname == NULL && verinfo == NULL,
546 ("linker_release_module: both file and name"));
547 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
553 linker_find_file_by_name(const char *filename)
558 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
559 sprintf(koname, "%s.ko", filename);
561 sx_assert(&kld_sx, SA_XLOCKED);
562 TAILQ_FOREACH(lf, &linker_files, link) {
563 if (strcmp(lf->filename, koname) == 0)
565 if (strcmp(lf->filename, filename) == 0)
568 free(koname, M_LINKER);
573 linker_find_file_by_id(int fileid)
577 sx_assert(&kld_sx, SA_XLOCKED);
578 TAILQ_FOREACH(lf, &linker_files, link)
579 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
585 linker_file_foreach(linker_predicate_t *predicate, void *context)
591 TAILQ_FOREACH(lf, &linker_files, link) {
592 retval = predicate(lf, context);
601 linker_make_file(const char *pathname, linker_class_t lc)
604 const char *filename;
607 sx_assert(&kld_sx, SA_XLOCKED);
608 filename = linker_basename(pathname);
610 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
611 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
619 lf->filename = strdup(filename, M_LINKER);
620 lf->pathname = strdup(pathname, M_LINKER);
621 LINKER_GET_NEXT_FILE_ID(lf->id);
624 lf->loadcnt = ++loadcnt;
629 STAILQ_INIT(&lf->common);
630 TAILQ_INIT(&lf->modules);
631 TAILQ_INSERT_TAIL(&linker_files, lf, link);
636 linker_file_unload(linker_file_t file, int flags)
639 modlist_t ml, nextml;
640 struct common_symbol *cp;
643 /* Refuse to unload modules if securelevel raised. */
644 if (prison0.pr_securelevel > 0)
647 sx_assert(&kld_sx, SA_XLOCKED);
648 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
650 /* Easy case of just dropping a reference. */
651 if (file->refs > 1) {
656 /* Give eventhandlers a chance to prevent the unload. */
658 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
662 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
663 " informing modules\n"));
666 * Quiesce all the modules to give them a chance to veto the unload.
669 for (mod = TAILQ_FIRST(&file->modules); mod;
670 mod = module_getfnext(mod)) {
672 error = module_quiesce(mod);
673 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
674 KLD_DPF(FILE, ("linker_file_unload: module %s"
675 " vetoed unload\n", module_getname(mod)));
677 * XXX: Do we need to tell all the quiesced modules
678 * that they can resume work now via a new module
688 * Inform any modules associated with this file that they are
692 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
693 next = module_getfnext(mod);
697 * Give the module a chance to veto the unload.
699 if ((error = module_unload(mod)) != 0) {
702 KLD_DPF(FILE, ("linker_file_unload: module %s"
703 " failed unload\n", module_getname(mod)));
713 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
714 if (ml->container == file) {
715 TAILQ_REMOVE(&found_modules, ml, link);
721 * Don't try to run SYSUNINITs if we are unloaded due to a
724 if (file->flags & LINKER_FILE_LINKED) {
725 file->flags &= ~LINKER_FILE_LINKED;
726 linker_file_unregister_sysctls(file);
727 linker_file_sysuninit(file);
729 TAILQ_REMOVE(&linker_files, file, link);
732 for (i = 0; i < file->ndeps; i++)
733 linker_file_unload(file->deps[i], flags);
734 free(file->deps, M_LINKER);
737 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
738 STAILQ_REMOVE_HEAD(&file->common, link);
744 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
747 if (file->filename) {
748 free(file->filename, M_LINKER);
749 file->filename = NULL;
751 if (file->pathname) {
752 free(file->pathname, M_LINKER);
753 file->pathname = NULL;
755 kobj_delete((kobj_t) file, M_LINKER);
760 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
762 return (LINKER_CTF_GET(file, lc));
766 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
768 linker_file_t *newdeps;
770 sx_assert(&kld_sx, SA_XLOCKED);
771 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
772 M_LINKER, M_WAITOK | M_ZERO);
773 file->deps[file->ndeps] = dep;
775 KLD_DPF(FILE, ("linker_file_add_dependency:"
776 " adding %s as dependency for %s\n",
777 dep->filename, file->filename));
782 * Locate a linker set and its contents. This is a helper function to avoid
783 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
784 * This function is used in this file so we can avoid having lots of (void **)
788 linker_file_lookup_set(linker_file_t file, const char *name,
789 void *firstp, void *lastp, int *countp)
792 sx_assert(&kld_sx, SA_LOCKED);
793 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
797 * List all functions in a file.
800 linker_file_function_listall(linker_file_t lf,
801 linker_function_nameval_callback_t callback_func, void *arg)
803 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
807 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
812 locked = sx_xlocked(&kld_sx);
815 sym = linker_file_lookup_symbol_internal(file, name, deps);
822 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
826 linker_symval_t symval;
828 size_t common_size = 0;
831 sx_assert(&kld_sx, SA_XLOCKED);
832 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
835 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
836 LINKER_SYMBOL_VALUES(file, sym, &symval);
837 if (symval.value == 0)
839 * For commons, first look them up in the
840 * dependencies and only allocate space if not found
843 common_size = symval.size;
845 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
846 ".value=%p\n", symval.value));
847 return (symval.value);
851 for (i = 0; i < file->ndeps; i++) {
852 address = linker_file_lookup_symbol_internal(
853 file->deps[i], name, 0);
855 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
856 " deps value=%p\n", address));
861 if (common_size > 0) {
863 * This is a common symbol which was not found in the
864 * dependencies. We maintain a simple common symbol table in
867 struct common_symbol *cp;
869 STAILQ_FOREACH(cp, &file->common, link) {
870 if (strcmp(cp->name, name) == 0) {
871 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
872 " old common value=%p\n", cp->address));
873 return (cp->address);
877 * Round the symbol size up to align.
879 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
880 cp = malloc(sizeof(struct common_symbol)
881 + common_size + strlen(name) + 1, M_LINKER,
883 cp->address = (caddr_t)(cp + 1);
884 cp->name = cp->address + common_size;
885 strcpy(cp->name, name);
886 bzero(cp->address, common_size);
887 STAILQ_INSERT_TAIL(&file->common, cp, link);
889 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
890 " value=%p\n", cp->address));
891 return (cp->address);
893 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
898 * Both DDB and stack(9) rely on the kernel linker to provide forward and
899 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
900 * do this in a lockfree manner. We provide a set of internal helper
901 * routines to perform these operations without locks, and then wrappers that
904 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
908 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
912 TAILQ_FOREACH(lf, &linker_files, link) {
913 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
921 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
924 c_linker_sym_t best, es;
925 u_long diff, bestdiff, off;
928 off = (uintptr_t)value;
930 TAILQ_FOREACH(lf, &linker_files, link) {
931 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
933 if (es != 0 && diff < bestdiff) {
952 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
956 TAILQ_FOREACH(lf, &linker_files, link) {
957 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
964 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
967 linker_symval_t symval;
972 error = linker_debug_search_symbol(value, &sym, offset);
975 error = linker_debug_symbol_values(sym, &symval);
978 strlcpy(buf, symval.name, buflen);
983 * DDB Helpers. DDB has to look across multiple files with their own symbol
984 * tables and string tables.
986 * Note that we do not obey list locking protocols here. We really don't need
987 * DDB to hang because somebody's got the lock held. We'll take the chance
988 * that the files list is inconsistent instead.
992 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
995 return (linker_debug_lookup(symstr, sym));
1000 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
1003 return (linker_debug_search_symbol(value, sym, diffp));
1007 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1010 return (linker_debug_symbol_values(sym, symval));
1014 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1018 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1022 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1023 * obey locking protocols, and offer a significantly less complex interface.
1026 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen,
1027 long *offset, int flags)
1031 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 &&
1032 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK),
1033 ("%s: bad flags: 0x%x", __func__, flags));
1035 if (flags & M_NOWAIT) {
1036 if (!sx_try_slock(&kld_sx))
1037 return (EWOULDBLOCK);
1041 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1042 sx_sunlock(&kld_sx);
1047 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1051 return (linker_search_symbol_name_flags(value, buf, buflen, offset,
1059 kern_kldload(struct thread *td, const char *file, int *fileid)
1061 const char *kldname, *modname;
1065 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1068 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1072 * It is possible that kldloaded module will attach a new ifnet,
1073 * so vnet context must be set when this ocurs.
1075 CURVNET_SET(TD_TO_VNET(td));
1078 * If file does not contain a qualified name or any dot in it
1079 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1082 if (strchr(file, '/') || strchr(file, '.')) {
1091 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1093 sx_xunlock(&kld_sx);
1099 sx_xunlock(&kld_sx);
1107 sys_kldload(struct thread *td, struct kldload_args *uap)
1109 char *pathname = NULL;
1112 td->td_retval[0] = -1;
1114 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1115 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1117 error = kern_kldload(td, pathname, &fileid);
1119 td->td_retval[0] = fileid;
1121 free(pathname, M_TEMP);
1126 kern_kldunload(struct thread *td, int fileid, int flags)
1131 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1134 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1137 CURVNET_SET(TD_TO_VNET(td));
1139 lf = linker_find_file_by_id(fileid);
1141 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1143 if (lf->userrefs == 0) {
1145 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1147 printf("kldunload: attempt to unload file that was"
1148 " loaded by the kernel\n");
1152 error = linker_file_unload(lf, flags);
1158 sx_xunlock(&kld_sx);
1165 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1168 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1172 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1175 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1176 uap->flags != LINKER_UNLOAD_FORCE)
1178 return (kern_kldunload(td, uap->fileid, uap->flags));
1182 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1185 const char *filename;
1190 error = mac_kld_check_stat(td->td_ucred);
1195 td->td_retval[0] = -1;
1197 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1198 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1201 filename = linker_basename(pathname);
1203 lf = linker_find_file_by_name(filename);
1205 td->td_retval[0] = lf->id;
1208 sx_xunlock(&kld_sx);
1210 free(pathname, M_TEMP);
1215 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1221 error = mac_kld_check_stat(td->td_ucred);
1227 if (uap->fileid == 0)
1228 lf = TAILQ_FIRST(&linker_files);
1230 lf = linker_find_file_by_id(uap->fileid);
1235 lf = TAILQ_NEXT(lf, link);
1238 /* Skip partially loaded files. */
1239 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1240 lf = TAILQ_NEXT(lf, link);
1243 td->td_retval[0] = lf->id;
1245 td->td_retval[0] = 0;
1247 sx_xunlock(&kld_sx);
1252 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1254 struct kld_file_stat *stat;
1258 * Check the version of the user's structure.
1260 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1263 if (version != sizeof(struct kld_file_stat_1) &&
1264 version != sizeof(struct kld_file_stat))
1267 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1268 error = kern_kldstat(td, uap->fileid, stat);
1270 error = copyout(stat, uap->stat, version);
1276 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1283 error = mac_kld_check_stat(td->td_ucred);
1289 lf = linker_find_file_by_id(fileid);
1291 sx_xunlock(&kld_sx);
1295 /* Version 1 fields: */
1296 namelen = strlen(lf->filename) + 1;
1297 if (namelen > sizeof(stat->name))
1298 namelen = sizeof(stat->name);
1299 bcopy(lf->filename, &stat->name[0], namelen);
1300 stat->refs = lf->refs;
1302 stat->address = lf->address;
1303 stat->size = lf->size;
1304 /* Version 2 fields: */
1305 namelen = strlen(lf->pathname) + 1;
1306 if (namelen > sizeof(stat->pathname))
1307 namelen = sizeof(stat->pathname);
1308 bcopy(lf->pathname, &stat->pathname[0], namelen);
1309 sx_xunlock(&kld_sx);
1311 td->td_retval[0] = 0;
1316 DB_COMMAND(kldstat, db_kldstat)
1320 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1321 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1322 #undef POINTER_WIDTH
1323 TAILQ_FOREACH(lf, &linker_files, link) {
1326 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1327 lf->address, lf->size, lf->filename);
1333 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1340 error = mac_kld_check_stat(td->td_ucred);
1346 lf = linker_find_file_by_id(uap->fileid);
1349 mp = TAILQ_FIRST(&lf->modules);
1351 td->td_retval[0] = module_getid(mp);
1353 td->td_retval[0] = 0;
1357 sx_xunlock(&kld_sx);
1362 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1364 char *symstr = NULL;
1366 linker_symval_t symval;
1368 struct kld_sym_lookup lookup;
1372 error = mac_kld_check_stat(td->td_ucred);
1377 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1379 if (lookup.version != sizeof(lookup) ||
1380 uap->cmd != KLDSYM_LOOKUP)
1382 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1383 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1386 if (uap->fileid != 0) {
1387 lf = linker_find_file_by_id(uap->fileid);
1390 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1391 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1392 lookup.symvalue = (uintptr_t) symval.value;
1393 lookup.symsize = symval.size;
1394 error = copyout(&lookup, uap->data, sizeof(lookup));
1398 TAILQ_FOREACH(lf, &linker_files, link) {
1399 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1400 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1401 lookup.symvalue = (uintptr_t)symval.value;
1402 lookup.symsize = symval.size;
1403 error = copyout(&lookup, uap->data,
1411 sx_xunlock(&kld_sx);
1413 free(symstr, M_TEMP);
1418 * Preloaded module support
1422 modlist_lookup(const char *name, int ver)
1426 TAILQ_FOREACH(mod, &found_modules, link) {
1427 if (strcmp(mod->name, name) == 0 &&
1428 (ver == 0 || mod->version == ver))
1435 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1437 modlist_t mod, bestmod;
1440 if (verinfo == NULL)
1441 return (modlist_lookup(name, 0));
1443 TAILQ_FOREACH(mod, &found_modules, link) {
1444 if (strcmp(mod->name, name) != 0)
1447 if (ver == verinfo->md_ver_preferred)
1449 if (ver >= verinfo->md_ver_minimum &&
1450 ver <= verinfo->md_ver_maximum &&
1451 (bestmod == NULL || ver > bestmod->version))
1458 modlist_newmodule(const char *modname, int version, linker_file_t container)
1462 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1464 panic("no memory for module list");
1465 mod->container = container;
1466 mod->name = modname;
1467 mod->version = version;
1468 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1473 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1474 struct mod_metadata **stop, int preload)
1476 struct mod_metadata *mp, **mdp;
1477 const char *modname;
1480 for (mdp = start; mdp < stop; mdp++) {
1482 if (mp->md_type != MDT_VERSION)
1484 modname = mp->md_cval;
1485 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1486 if (modlist_lookup(modname, ver) != NULL) {
1487 printf("module %s already present!\n", modname);
1488 /* XXX what can we do? this is a build error. :-( */
1491 modlist_newmodule(modname, ver, lf);
1496 linker_preload(void *arg)
1499 const char *modname, *nmodname;
1501 linker_file_t lf, nlf;
1504 linker_file_list_t loaded_files;
1505 linker_file_list_t depended_files;
1506 struct mod_metadata *mp, *nmp;
1507 struct mod_metadata **start, **stop, **mdp, **nmdp;
1508 const struct mod_depend *verinfo;
1512 struct sysinit **si_start, **si_stop;
1514 TAILQ_INIT(&loaded_files);
1515 TAILQ_INIT(&depended_files);
1516 TAILQ_INIT(&found_modules);
1521 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1522 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1523 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1524 if (modname == NULL) {
1525 printf("Preloaded module at %p does not have a"
1526 " name!\n", modptr);
1529 if (modtype == NULL) {
1530 printf("Preloaded module at %p does not have a type!\n",
1535 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1538 TAILQ_FOREACH(lc, &classes, link) {
1539 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1545 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1549 * First get a list of stuff in the kernel.
1551 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1553 linker_addmodules(linker_kernel_file, start, stop, 1);
1556 * This is a once-off kinky bubble sort to resolve relocation
1557 * dependency requirements.
1560 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1561 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1564 * First, look to see if we would successfully link with this
1567 resolves = 1; /* unless we know otherwise */
1569 for (mdp = start; mdp < stop; mdp++) {
1571 if (mp->md_type != MDT_DEPEND)
1573 modname = mp->md_cval;
1574 verinfo = mp->md_data;
1575 for (nmdp = start; nmdp < stop; nmdp++) {
1577 if (nmp->md_type != MDT_VERSION)
1579 nmodname = nmp->md_cval;
1580 if (strcmp(modname, nmodname) == 0)
1583 if (nmdp < stop) /* it's a self reference */
1587 * ok, the module isn't here yet, we
1590 if (modlist_lookup2(modname, verinfo) == NULL)
1595 * OK, if we found our modules, we can link. So, "provide"
1596 * the modules inside and add it to the end of the link order
1601 for (mdp = start; mdp < stop; mdp++) {
1603 if (mp->md_type != MDT_VERSION)
1605 modname = mp->md_cval;
1606 nver = ((const struct mod_version *)
1607 mp->md_data)->mv_version;
1608 if (modlist_lookup(modname,
1610 printf("module %s already"
1611 " present!\n", modname);
1612 TAILQ_REMOVE(&loaded_files,
1614 linker_file_unload(lf,
1615 LINKER_UNLOAD_FORCE);
1616 /* we changed tailq next ptr */
1619 modlist_newmodule(modname, nver, lf);
1622 TAILQ_REMOVE(&loaded_files, lf, loaded);
1623 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1625 * Since we provided modules, we need to restart the
1626 * sort so that the previous files that depend on us
1627 * have a chance. Also, we've busted the tailq next
1628 * pointer with the REMOVE.
1635 * At this point, we check to see what could not be resolved..
1637 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1638 TAILQ_REMOVE(&loaded_files, lf, loaded);
1639 printf("KLD file %s is missing dependencies\n", lf->filename);
1640 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1644 * We made it. Finish off the linking in the order we determined.
1646 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1647 if (linker_kernel_file) {
1648 linker_kernel_file->refs++;
1649 error = linker_file_add_dependency(lf,
1650 linker_kernel_file);
1652 panic("cannot add dependency");
1654 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1657 for (mdp = start; mdp < stop; mdp++) {
1659 if (mp->md_type != MDT_DEPEND)
1661 modname = mp->md_cval;
1662 verinfo = mp->md_data;
1663 mod = modlist_lookup2(modname, verinfo);
1665 printf("KLD file %s - cannot find "
1666 "dependency \"%s\"\n",
1667 lf->filename, modname);
1670 /* Don't count self-dependencies */
1671 if (lf == mod->container)
1673 mod->container->refs++;
1674 error = linker_file_add_dependency(lf,
1677 panic("cannot add dependency");
1681 * Now do relocation etc using the symbol search paths
1682 * established by the dependencies
1684 error = LINKER_LINK_PRELOAD_FINISH(lf);
1686 printf("KLD file %s - could not finalize loading\n",
1690 linker_file_register_modules(lf);
1691 if (!TAILQ_EMPTY(&lf->modules))
1692 lf->flags |= LINKER_FILE_MODULES;
1693 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1694 &si_stop, NULL) == 0)
1695 sysinit_add(si_start, si_stop);
1696 linker_file_register_sysctls(lf, true);
1697 lf->flags |= LINKER_FILE_LINKED;
1700 TAILQ_REMOVE(&depended_files, lf, loaded);
1701 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1703 sx_xunlock(&kld_sx);
1704 /* woohoo! we made it! */
1707 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL);
1710 * Handle preload files that failed to load any modules.
1713 linker_preload_finish(void *arg)
1715 linker_file_t lf, nlf;
1718 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
1720 * If all of the modules in this file failed to load, unload
1721 * the file and return an error of ENOEXEC. (Parity with
1722 * linker_load_file.)
1724 if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
1725 TAILQ_EMPTY(&lf->modules)) {
1726 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1730 lf->flags &= ~LINKER_FILE_MODULES;
1731 lf->userrefs++; /* so we can (try to) kldunload it */
1733 sx_xunlock(&kld_sx);
1737 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
1738 * scheduled at any subsystem and order, so run this as late as possible. init
1739 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
1741 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
1742 linker_preload_finish, NULL);
1745 * Search for a not-loaded module by name.
1747 * Modules may be found in the following locations:
1749 * - preloaded (result is just the module name) - on disk (result is full path
1752 * If the module name is qualified in any way (contains path, etc.) the we
1753 * simply return a copy of it.
1755 * The search path can be manipulated via sysctl. Note that we use the ';'
1756 * character as a separator to be consistent with the bootloader.
1759 static char linker_hintfile[] = "linker.hints";
1760 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1762 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1763 sizeof(linker_path), "module load search path");
1765 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1767 static const char * const linker_ext_list[] = {
1774 * Check if file actually exists either with or without extension listed in
1775 * the linker_ext_list. (probably should be generic for the rest of the
1779 linker_lookup_file(const char *path, int pathlen, const char *name,
1780 int namelen, struct vattr *vap)
1782 struct nameidata nd;
1783 struct thread *td = curthread; /* XXX */
1784 const char * const *cpp, *sep;
1786 int error, len, extlen, reclen, flags;
1790 for (cpp = linker_ext_list; *cpp; cpp++) {
1795 extlen++; /* trailing '\0' */
1796 sep = (path[pathlen - 1] != '/') ? "/" : "";
1798 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1799 result = malloc(reclen, M_LINKER, M_WAITOK);
1800 for (cpp = linker_ext_list; *cpp; cpp++) {
1801 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1802 namelen, name, *cpp);
1804 * Attempt to open the file, and return the path if
1805 * we succeed and it's a regular file.
1807 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1809 error = vn_open(&nd, &flags, 0, NULL);
1811 NDFREE(&nd, NDF_ONLY_PNBUF);
1812 type = nd.ni_vp->v_type;
1814 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1815 VOP_UNLOCK(nd.ni_vp);
1816 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1821 free(result, M_LINKER);
1825 #define INT_ALIGN(base, ptr) ptr = \
1826 (base) + roundup2((ptr) - (base), sizeof(int))
1829 * Lookup KLD which contains requested module in the "linker.hints" file. If
1830 * version specification is available, then try to find the best KLD.
1831 * Otherwise just find the latest one.
1834 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1835 int modnamelen, const struct mod_depend *verinfo)
1837 struct thread *td = curthread; /* XXX */
1838 struct ucred *cred = td ? td->td_ucred : NULL;
1839 struct nameidata nd;
1840 struct vattr vattr, mattr;
1841 const char *best, *sep;
1842 u_char *hints = NULL;
1843 u_char *cp, *recptr, *bufend, *result, *pathbuf;
1844 int error, ival, bestver, *intp, found, flags, clen, blen;
1848 bestver = found = 0;
1850 sep = (path[pathlen - 1] != '/') ? "/" : "";
1851 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1853 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1854 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1857 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1859 error = vn_open(&nd, &flags, 0, NULL);
1862 NDFREE(&nd, NDF_ONLY_PNBUF);
1863 if (nd.ni_vp->v_type != VREG)
1866 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1870 * XXX: we need to limit this number to some reasonable value
1872 if (vattr.va_size > LINKER_HINTS_MAX) {
1873 printf("linker.hints file too large %ld\n", (long)vattr.va_size);
1876 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1877 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1878 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1881 VOP_UNLOCK(nd.ni_vp);
1882 vn_close(nd.ni_vp, FREAD, cred, td);
1885 printf("can't read %zd\n", reclen);
1888 intp = (int *)hints;
1890 if (ival != LINKER_HINTS_VERSION) {
1891 printf("linker.hints file version mismatch %d\n", ival);
1894 bufend = hints + vattr.va_size;
1895 recptr = (u_char *)intp;
1897 while (recptr < bufend && !found) {
1898 intp = (int *)recptr;
1905 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1908 INT_ALIGN(hints, cp);
1912 if (verinfo == NULL ||
1913 ival == verinfo->md_ver_preferred) {
1917 if (ival >= verinfo->md_ver_minimum &&
1918 ival <= verinfo->md_ver_maximum &&
1928 recptr += reclen + sizeof(int);
1931 * Finally check if KLD is in the place
1934 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1936 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1939 * KLD is newer than hints file. What we should do now?
1941 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1942 printf("warning: KLD '%s' is newer than the linker.hints"
1945 free(pathbuf, M_LINKER);
1947 free(hints, M_TEMP);
1948 if (nd.ni_vp != NULL) {
1949 VOP_UNLOCK(nd.ni_vp);
1950 vn_close(nd.ni_vp, FREAD, cred, td);
1953 * If nothing found or hints is absent - fallback to the old
1954 * way by using "kldname[.ko]" as module name.
1956 if (!found && !bestver && result == NULL)
1957 result = linker_lookup_file(path, pathlen, modname,
1963 * Lookup KLD which contains requested module in the all directories.
1966 linker_search_module(const char *modname, int modnamelen,
1967 const struct mod_depend *verinfo)
1969 char *cp, *ep, *result;
1972 * traverse the linker path
1974 for (cp = linker_path; *cp; cp = ep + 1) {
1975 /* find the end of this component */
1976 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1977 result = linker_hints_lookup(cp, ep - cp, modname,
1978 modnamelen, verinfo);
1988 * Search for module in all directories listed in the linker_path.
1991 linker_search_kld(const char *name)
1993 char *cp, *ep, *result;
1996 /* qualified at all? */
1997 if (strchr(name, '/'))
1998 return (strdup(name, M_LINKER));
2000 /* traverse the linker path */
2002 for (ep = linker_path; *ep; ep++) {
2004 /* find the end of this component */
2005 for (; *ep != 0 && *ep != ';'; ep++);
2006 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
2014 linker_basename(const char *path)
2016 const char *filename;
2018 filename = strrchr(path, '/');
2019 if (filename == NULL)
2028 * Inform hwpmc about the set of kernel modules currently loaded.
2031 linker_hwpmc_list_objects(void)
2034 struct pmckern_map_in *kobase;
2039 TAILQ_FOREACH(lf, &linker_files, link)
2042 /* Allocate nmappings + 1 entries. */
2043 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
2044 M_LINKER, M_WAITOK | M_ZERO);
2046 TAILQ_FOREACH(lf, &linker_files, link) {
2048 /* Save the info for this linker file. */
2049 kobase[i].pm_file = lf->filename;
2050 kobase[i].pm_address = (uintptr_t)lf->address;
2053 sx_sunlock(&kld_sx);
2055 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
2057 /* The last entry of the malloced area comprises of all zeros. */
2058 KASSERT(kobase[i].pm_file == NULL,
2059 ("linker_hwpmc_list_objects: last object not NULL"));
2061 return ((void *)kobase);
2065 /* check if root file system is not mounted */
2067 linker_root_mounted(void)
2072 if (rootvnode == NULL)
2075 pwd = pwd_hold(curthread);
2076 ret = pwd->pwd_rdir != NULL;
2082 * Find a file which contains given module and load it, if "parent" is not
2083 * NULL, register a reference to it.
2086 linker_load_module(const char *kldname, const char *modname,
2087 struct linker_file *parent, const struct mod_depend *verinfo,
2088 struct linker_file **lfpp)
2090 linker_file_t lfdep;
2091 const char *filename;
2095 sx_assert(&kld_sx, SA_XLOCKED);
2096 if (modname == NULL) {
2098 * We have to load KLD
2100 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2102 if (!linker_root_mounted())
2104 pathname = linker_search_kld(kldname);
2106 if (modlist_lookup2(modname, verinfo) != NULL)
2108 if (!linker_root_mounted())
2110 if (kldname != NULL)
2111 pathname = strdup(kldname, M_LINKER);
2114 * Need to find a KLD with required module
2116 pathname = linker_search_module(modname,
2117 strlen(modname), verinfo);
2119 if (pathname == NULL)
2123 * Can't load more than one file with the same basename XXX:
2124 * Actually it should be possible to have multiple KLDs with
2125 * the same basename but different path because they can
2126 * provide different versions of the same modules.
2128 filename = linker_basename(pathname);
2129 if (linker_find_file_by_name(filename))
2132 error = linker_load_file(pathname, &lfdep);
2135 if (modname && verinfo &&
2136 modlist_lookup2(modname, verinfo) == NULL) {
2137 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2142 error = linker_file_add_dependency(parent, lfdep);
2149 free(pathname, M_LINKER);
2154 * This routine is responsible for finding dependencies of userland initiated
2155 * kldload(2)'s of files.
2158 linker_load_dependencies(linker_file_t lf)
2160 linker_file_t lfdep;
2161 struct mod_metadata **start, **stop, **mdp, **nmdp;
2162 struct mod_metadata *mp, *nmp;
2163 const struct mod_depend *verinfo;
2165 const char *modname, *nmodname;
2169 * All files are dependent on /kernel.
2171 sx_assert(&kld_sx, SA_XLOCKED);
2172 if (linker_kernel_file) {
2173 linker_kernel_file->refs++;
2174 error = linker_file_add_dependency(lf, linker_kernel_file);
2178 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2181 for (mdp = start; mdp < stop; mdp++) {
2183 if (mp->md_type != MDT_VERSION)
2185 modname = mp->md_cval;
2186 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2187 mod = modlist_lookup(modname, ver);
2189 printf("interface %s.%d already present in the KLD"
2190 " '%s'!\n", modname, ver,
2191 mod->container->filename);
2196 for (mdp = start; mdp < stop; mdp++) {
2198 if (mp->md_type != MDT_DEPEND)
2200 modname = mp->md_cval;
2201 verinfo = mp->md_data;
2203 for (nmdp = start; nmdp < stop; nmdp++) {
2205 if (nmp->md_type != MDT_VERSION)
2207 nmodname = nmp->md_cval;
2208 if (strcmp(modname, nmodname) == 0)
2211 if (nmdp < stop)/* early exit, it's a self reference */
2213 mod = modlist_lookup2(modname, verinfo);
2214 if (mod) { /* woohoo, it's loaded already */
2215 lfdep = mod->container;
2217 error = linker_file_add_dependency(lf, lfdep);
2222 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2224 printf("KLD %s: depends on %s - not available or"
2225 " version mismatch\n", lf->filename, modname);
2232 linker_addmodules(lf, start, stop, 0);
2237 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2239 struct sysctl_req *req;
2242 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2246 * Export a nul-separated, double-nul-terminated list of all function names
2250 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2256 error = mac_kld_check_stat(req->td->td_ucred);
2260 error = sysctl_wire_old_buffer(req, 0);
2264 TAILQ_FOREACH(lf, &linker_files, link) {
2265 error = LINKER_EACH_FUNCTION_NAME(lf,
2266 sysctl_kern_function_list_iterate, req);
2268 sx_xunlock(&kld_sx);
2272 sx_xunlock(&kld_sx);
2273 return (SYSCTL_OUT(req, "", 1));
2276 SYSCTL_PROC(_kern, OID_AUTO, function_list,
2277 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
2278 sysctl_kern_function_list, "",
2279 "kernel function list");