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, "modmetadata_set", &start,
375 * This fallback should be unnecessary, but if we get booted
376 * from boot2 instead of loader and we are missing our
377 * metadata then we have to try the best we can.
379 if (lf == linker_kernel_file) {
380 start = SET_BEGIN(modmetadata_set);
381 stop = SET_LIMIT(modmetadata_set);
386 for (mdp = start; mdp < stop; mdp++) {
387 if ((*mdp)->md_type != MDT_MODULE)
389 moddata = (*mdp)->md_data;
390 KLD_DPF(FILE, ("Registering module %s in %s\n",
391 moddata->name, lf->filename));
392 error = module_register(moddata, lf);
394 printf("Module %s failed to register: %d\n",
395 moddata->name, error);
396 if (first_error == 0)
400 return (first_error);
404 linker_init_kernel_modules(void)
408 linker_file_register_modules(linker_kernel_file);
412 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
416 linker_load_file(const char *filename, linker_file_t *result)
420 int foundfile, error, modules;
422 /* Refuse to load modules if securelevel raised */
423 if (prison0.pr_securelevel > 0)
426 sx_assert(&kld_sx, SA_XLOCKED);
427 lf = linker_find_file_by_name(filename);
429 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
430 " incrementing refs\n", filename));
439 * We do not need to protect (lock) classes here because there is
440 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
441 * and there is no class deregistration mechanism at this time.
443 TAILQ_FOREACH(lc, &classes, link) {
444 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
446 error = LINKER_LOAD_FILE(lc, filename, &lf);
448 * If we got something other than ENOENT, then it exists but
449 * we cannot load it for some other reason.
454 error = linker_file_register_modules(lf);
455 if (error == EEXIST) {
456 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
459 modules = !TAILQ_EMPTY(&lf->modules);
460 linker_file_register_sysctls(lf, false);
461 linker_file_sysinit(lf);
462 lf->flags |= LINKER_FILE_LINKED;
465 * If all of the modules in this file failed
466 * to load, unload the file and return an
469 if (modules && TAILQ_EMPTY(&lf->modules)) {
470 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
473 linker_file_enable_sysctls(lf);
474 EVENTHANDLER_INVOKE(kld_load, lf);
480 * Less than ideal, but tells the user whether it failed to load or
481 * the module was not found.
486 * If the file type has not been recognized by the last try
487 * printout a message before to fail.
490 printf("%s: %s - unsupported file type\n",
494 * Format not recognized or otherwise unloadable.
495 * When loading a module that is statically built into
496 * the kernel EEXIST percolates back up as the return
497 * value. Preserve this so that apps like sysinstall
498 * can recognize this special case and not post bogus
504 error = ENOENT; /* Nothing found */
509 linker_reference_module(const char *modname, struct mod_depend *verinfo,
510 linker_file_t *result)
516 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
517 *result = mod->container;
523 error = linker_load_module(NULL, modname, NULL, verinfo, result);
529 linker_release_module(const char *modname, struct mod_depend *verinfo,
537 KASSERT(modname != NULL,
538 ("linker_release_module: no file or name"));
539 mod = modlist_lookup2(modname, verinfo);
546 KASSERT(modname == NULL && verinfo == NULL,
547 ("linker_release_module: both file and name"));
548 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
554 linker_find_file_by_name(const char *filename)
559 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
560 sprintf(koname, "%s.ko", filename);
562 sx_assert(&kld_sx, SA_XLOCKED);
563 TAILQ_FOREACH(lf, &linker_files, link) {
564 if (strcmp(lf->filename, koname) == 0)
566 if (strcmp(lf->filename, filename) == 0)
569 free(koname, M_LINKER);
574 linker_find_file_by_id(int fileid)
578 sx_assert(&kld_sx, SA_XLOCKED);
579 TAILQ_FOREACH(lf, &linker_files, link)
580 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
586 linker_file_foreach(linker_predicate_t *predicate, void *context)
592 TAILQ_FOREACH(lf, &linker_files, link) {
593 retval = predicate(lf, context);
602 linker_make_file(const char *pathname, linker_class_t lc)
605 const char *filename;
608 sx_assert(&kld_sx, SA_XLOCKED);
609 filename = linker_basename(pathname);
611 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
612 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
620 lf->filename = strdup(filename, M_LINKER);
621 lf->pathname = strdup(pathname, M_LINKER);
622 LINKER_GET_NEXT_FILE_ID(lf->id);
625 lf->loadcnt = ++loadcnt;
630 STAILQ_INIT(&lf->common);
631 TAILQ_INIT(&lf->modules);
632 TAILQ_INSERT_TAIL(&linker_files, lf, link);
637 linker_file_unload(linker_file_t file, int flags)
640 modlist_t ml, nextml;
641 struct common_symbol *cp;
644 /* Refuse to unload modules if securelevel raised. */
645 if (prison0.pr_securelevel > 0)
648 sx_assert(&kld_sx, SA_XLOCKED);
649 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
651 /* Easy case of just dropping a reference. */
652 if (file->refs > 1) {
657 /* Give eventhandlers a chance to prevent the unload. */
659 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
663 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
664 " informing modules\n"));
667 * Quiesce all the modules to give them a chance to veto the unload.
670 for (mod = TAILQ_FIRST(&file->modules); mod;
671 mod = module_getfnext(mod)) {
673 error = module_quiesce(mod);
674 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
675 KLD_DPF(FILE, ("linker_file_unload: module %s"
676 " vetoed unload\n", module_getname(mod)));
678 * XXX: Do we need to tell all the quiesced modules
679 * that they can resume work now via a new module
689 * Inform any modules associated with this file that they are
693 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
694 next = module_getfnext(mod);
698 * Give the module a chance to veto the unload.
700 if ((error = module_unload(mod)) != 0) {
703 KLD_DPF(FILE, ("linker_file_unload: module %s"
704 " failed unload\n", module_getname(mod)));
714 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
715 if (ml->container == file) {
716 TAILQ_REMOVE(&found_modules, ml, link);
722 * Don't try to run SYSUNINITs if we are unloaded due to a
725 if (file->flags & LINKER_FILE_LINKED) {
726 file->flags &= ~LINKER_FILE_LINKED;
727 linker_file_unregister_sysctls(file);
728 linker_file_sysuninit(file);
730 TAILQ_REMOVE(&linker_files, file, link);
733 for (i = 0; i < file->ndeps; i++)
734 linker_file_unload(file->deps[i], flags);
735 free(file->deps, M_LINKER);
738 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
739 STAILQ_REMOVE_HEAD(&file->common, link);
745 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
748 if (file->filename) {
749 free(file->filename, M_LINKER);
750 file->filename = NULL;
752 if (file->pathname) {
753 free(file->pathname, M_LINKER);
754 file->pathname = NULL;
756 kobj_delete((kobj_t) file, M_LINKER);
761 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
763 return (LINKER_CTF_GET(file, lc));
767 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
769 linker_file_t *newdeps;
771 sx_assert(&kld_sx, SA_XLOCKED);
772 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
773 M_LINKER, M_WAITOK | M_ZERO);
774 file->deps[file->ndeps] = dep;
776 KLD_DPF(FILE, ("linker_file_add_dependency:"
777 " adding %s as dependency for %s\n",
778 dep->filename, file->filename));
783 * Locate a linker set and its contents. This is a helper function to avoid
784 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
785 * This function is used in this file so we can avoid having lots of (void **)
789 linker_file_lookup_set(linker_file_t file, const char *name,
790 void *firstp, void *lastp, int *countp)
793 sx_assert(&kld_sx, SA_LOCKED);
794 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
798 * List all functions in a file.
801 linker_file_function_listall(linker_file_t lf,
802 linker_function_nameval_callback_t callback_func, void *arg)
804 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
808 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
813 locked = sx_xlocked(&kld_sx);
816 sym = linker_file_lookup_symbol_internal(file, name, deps);
823 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
827 linker_symval_t symval;
829 size_t common_size = 0;
832 sx_assert(&kld_sx, SA_XLOCKED);
833 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
836 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
837 LINKER_SYMBOL_VALUES(file, sym, &symval);
838 if (symval.value == 0)
840 * For commons, first look them up in the
841 * dependencies and only allocate space if not found
844 common_size = symval.size;
846 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
847 ".value=%p\n", symval.value));
848 return (symval.value);
852 for (i = 0; i < file->ndeps; i++) {
853 address = linker_file_lookup_symbol_internal(
854 file->deps[i], name, 0);
856 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
857 " deps value=%p\n", address));
862 if (common_size > 0) {
864 * This is a common symbol which was not found in the
865 * dependencies. We maintain a simple common symbol table in
868 struct common_symbol *cp;
870 STAILQ_FOREACH(cp, &file->common, link) {
871 if (strcmp(cp->name, name) == 0) {
872 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
873 " old common value=%p\n", cp->address));
874 return (cp->address);
878 * Round the symbol size up to align.
880 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
881 cp = malloc(sizeof(struct common_symbol)
882 + common_size + strlen(name) + 1, M_LINKER,
884 cp->address = (caddr_t)(cp + 1);
885 cp->name = cp->address + common_size;
886 strcpy(cp->name, name);
887 bzero(cp->address, common_size);
888 STAILQ_INSERT_TAIL(&file->common, cp, link);
890 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
891 " value=%p\n", cp->address));
892 return (cp->address);
894 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
899 * Both DDB and stack(9) rely on the kernel linker to provide forward and
900 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
901 * do this in a lockfree manner. We provide a set of internal helper
902 * routines to perform these operations without locks, and then wrappers that
905 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
909 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
913 TAILQ_FOREACH(lf, &linker_files, link) {
914 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
922 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
925 c_linker_sym_t best, es;
926 u_long diff, bestdiff, off;
929 off = (uintptr_t)value;
931 TAILQ_FOREACH(lf, &linker_files, link) {
932 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
934 if (es != 0 && diff < bestdiff) {
953 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
957 TAILQ_FOREACH(lf, &linker_files, link) {
958 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
965 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
968 linker_symval_t symval;
973 error = linker_debug_search_symbol(value, &sym, offset);
976 error = linker_debug_symbol_values(sym, &symval);
979 strlcpy(buf, symval.name, buflen);
984 * DDB Helpers. DDB has to look across multiple files with their own symbol
985 * tables and string tables.
987 * Note that we do not obey list locking protocols here. We really don't need
988 * DDB to hang because somebody's got the lock held. We'll take the chance
989 * that the files list is inconsistent instead.
993 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
996 return (linker_debug_lookup(symstr, sym));
1001 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
1004 return (linker_debug_search_symbol(value, sym, diffp));
1008 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1011 return (linker_debug_symbol_values(sym, symval));
1015 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1019 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1023 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1024 * obey locking protocols, and offer a significantly less complex interface.
1027 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen,
1028 long *offset, int flags)
1032 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 &&
1033 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK),
1034 ("%s: bad flags: 0x%x", __func__, flags));
1036 if (flags & M_NOWAIT) {
1037 if (!sx_try_slock(&kld_sx))
1038 return (EWOULDBLOCK);
1042 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1043 sx_sunlock(&kld_sx);
1048 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1052 return (linker_search_symbol_name_flags(value, buf, buflen, offset,
1060 kern_kldload(struct thread *td, const char *file, int *fileid)
1062 const char *kldname, *modname;
1066 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1069 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1073 * It is possible that kldloaded module will attach a new ifnet,
1074 * so vnet context must be set when this ocurs.
1076 CURVNET_SET(TD_TO_VNET(td));
1079 * If file does not contain a qualified name or any dot in it
1080 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1083 if (strchr(file, '/') || strchr(file, '.')) {
1092 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1094 sx_xunlock(&kld_sx);
1100 sx_xunlock(&kld_sx);
1108 sys_kldload(struct thread *td, struct kldload_args *uap)
1110 char *pathname = NULL;
1113 td->td_retval[0] = -1;
1115 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1116 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1118 error = kern_kldload(td, pathname, &fileid);
1120 td->td_retval[0] = fileid;
1122 free(pathname, M_TEMP);
1127 kern_kldunload(struct thread *td, int fileid, int flags)
1132 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1135 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1138 CURVNET_SET(TD_TO_VNET(td));
1140 lf = linker_find_file_by_id(fileid);
1142 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1144 if (lf->userrefs == 0) {
1146 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1148 printf("kldunload: attempt to unload file that was"
1149 " loaded by the kernel\n");
1153 error = linker_file_unload(lf, flags);
1159 sx_xunlock(&kld_sx);
1166 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1169 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1173 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1176 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1177 uap->flags != LINKER_UNLOAD_FORCE)
1179 return (kern_kldunload(td, uap->fileid, uap->flags));
1183 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1186 const char *filename;
1191 error = mac_kld_check_stat(td->td_ucred);
1196 td->td_retval[0] = -1;
1198 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1199 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1202 filename = linker_basename(pathname);
1204 lf = linker_find_file_by_name(filename);
1206 td->td_retval[0] = lf->id;
1209 sx_xunlock(&kld_sx);
1211 free(pathname, M_TEMP);
1216 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1222 error = mac_kld_check_stat(td->td_ucred);
1228 if (uap->fileid == 0)
1229 lf = TAILQ_FIRST(&linker_files);
1231 lf = linker_find_file_by_id(uap->fileid);
1236 lf = TAILQ_NEXT(lf, link);
1239 /* Skip partially loaded files. */
1240 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1241 lf = TAILQ_NEXT(lf, link);
1244 td->td_retval[0] = lf->id;
1246 td->td_retval[0] = 0;
1248 sx_xunlock(&kld_sx);
1253 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1255 struct kld_file_stat *stat;
1259 * Check the version of the user's structure.
1261 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1264 if (version != sizeof(struct kld_file_stat_1) &&
1265 version != sizeof(struct kld_file_stat))
1268 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1269 error = kern_kldstat(td, uap->fileid, stat);
1271 error = copyout(stat, uap->stat, version);
1277 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1284 error = mac_kld_check_stat(td->td_ucred);
1290 lf = linker_find_file_by_id(fileid);
1292 sx_xunlock(&kld_sx);
1296 /* Version 1 fields: */
1297 namelen = strlen(lf->filename) + 1;
1298 if (namelen > sizeof(stat->name))
1299 namelen = sizeof(stat->name);
1300 bcopy(lf->filename, &stat->name[0], namelen);
1301 stat->refs = lf->refs;
1303 stat->address = lf->address;
1304 stat->size = lf->size;
1305 /* Version 2 fields: */
1306 namelen = strlen(lf->pathname) + 1;
1307 if (namelen > sizeof(stat->pathname))
1308 namelen = sizeof(stat->pathname);
1309 bcopy(lf->pathname, &stat->pathname[0], namelen);
1310 sx_xunlock(&kld_sx);
1312 td->td_retval[0] = 0;
1317 DB_COMMAND(kldstat, db_kldstat)
1321 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1322 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1323 #undef POINTER_WIDTH
1324 TAILQ_FOREACH(lf, &linker_files, link) {
1327 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1328 lf->address, lf->size, lf->filename);
1334 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1341 error = mac_kld_check_stat(td->td_ucred);
1347 lf = linker_find_file_by_id(uap->fileid);
1350 mp = TAILQ_FIRST(&lf->modules);
1352 td->td_retval[0] = module_getid(mp);
1354 td->td_retval[0] = 0;
1358 sx_xunlock(&kld_sx);
1363 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1365 char *symstr = NULL;
1367 linker_symval_t symval;
1369 struct kld_sym_lookup lookup;
1373 error = mac_kld_check_stat(td->td_ucred);
1378 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1380 if (lookup.version != sizeof(lookup) ||
1381 uap->cmd != KLDSYM_LOOKUP)
1383 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1384 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1387 if (uap->fileid != 0) {
1388 lf = linker_find_file_by_id(uap->fileid);
1391 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1392 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1393 lookup.symvalue = (uintptr_t) symval.value;
1394 lookup.symsize = symval.size;
1395 error = copyout(&lookup, uap->data, sizeof(lookup));
1399 TAILQ_FOREACH(lf, &linker_files, link) {
1400 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1401 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1402 lookup.symvalue = (uintptr_t)symval.value;
1403 lookup.symsize = symval.size;
1404 error = copyout(&lookup, uap->data,
1412 sx_xunlock(&kld_sx);
1414 free(symstr, M_TEMP);
1419 * Preloaded module support
1423 modlist_lookup(const char *name, int ver)
1427 TAILQ_FOREACH(mod, &found_modules, link) {
1428 if (strcmp(mod->name, name) == 0 &&
1429 (ver == 0 || mod->version == ver))
1436 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1438 modlist_t mod, bestmod;
1441 if (verinfo == NULL)
1442 return (modlist_lookup(name, 0));
1444 TAILQ_FOREACH(mod, &found_modules, link) {
1445 if (strcmp(mod->name, name) != 0)
1448 if (ver == verinfo->md_ver_preferred)
1450 if (ver >= verinfo->md_ver_minimum &&
1451 ver <= verinfo->md_ver_maximum &&
1452 (bestmod == NULL || ver > bestmod->version))
1459 modlist_newmodule(const char *modname, int version, linker_file_t container)
1463 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1465 panic("no memory for module list");
1466 mod->container = container;
1467 mod->name = modname;
1468 mod->version = version;
1469 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1474 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1475 struct mod_metadata **stop, int preload)
1477 struct mod_metadata *mp, **mdp;
1478 const char *modname;
1481 for (mdp = start; mdp < stop; mdp++) {
1483 if (mp->md_type != MDT_VERSION)
1485 modname = mp->md_cval;
1486 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1487 if (modlist_lookup(modname, ver) != NULL) {
1488 printf("module %s already present!\n", modname);
1489 /* XXX what can we do? this is a build error. :-( */
1492 modlist_newmodule(modname, ver, lf);
1497 linker_preload(void *arg)
1500 const char *modname, *nmodname;
1502 linker_file_t lf, nlf;
1505 linker_file_list_t loaded_files;
1506 linker_file_list_t depended_files;
1507 struct mod_metadata *mp, *nmp;
1508 struct mod_metadata **start, **stop, **mdp, **nmdp;
1509 const struct mod_depend *verinfo;
1513 struct sysinit **si_start, **si_stop;
1515 TAILQ_INIT(&loaded_files);
1516 TAILQ_INIT(&depended_files);
1517 TAILQ_INIT(&found_modules);
1522 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1523 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1524 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1525 if (modname == NULL) {
1526 printf("Preloaded module at %p does not have a"
1527 " name!\n", modptr);
1530 if (modtype == NULL) {
1531 printf("Preloaded module at %p does not have a type!\n",
1536 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1539 TAILQ_FOREACH(lc, &classes, link) {
1540 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1546 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1550 * First get a list of stuff in the kernel.
1552 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1554 linker_addmodules(linker_kernel_file, start, stop, 1);
1557 * This is a once-off kinky bubble sort to resolve relocation
1558 * dependency requirements.
1561 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1562 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1565 * First, look to see if we would successfully link with this
1568 resolves = 1; /* unless we know otherwise */
1570 for (mdp = start; mdp < stop; mdp++) {
1572 if (mp->md_type != MDT_DEPEND)
1574 modname = mp->md_cval;
1575 verinfo = mp->md_data;
1576 for (nmdp = start; nmdp < stop; nmdp++) {
1578 if (nmp->md_type != MDT_VERSION)
1580 nmodname = nmp->md_cval;
1581 if (strcmp(modname, nmodname) == 0)
1584 if (nmdp < stop) /* it's a self reference */
1588 * ok, the module isn't here yet, we
1591 if (modlist_lookup2(modname, verinfo) == NULL)
1596 * OK, if we found our modules, we can link. So, "provide"
1597 * the modules inside and add it to the end of the link order
1602 for (mdp = start; mdp < stop; mdp++) {
1604 if (mp->md_type != MDT_VERSION)
1606 modname = mp->md_cval;
1607 nver = ((const struct mod_version *)
1608 mp->md_data)->mv_version;
1609 if (modlist_lookup(modname,
1611 printf("module %s already"
1612 " present!\n", modname);
1613 TAILQ_REMOVE(&loaded_files,
1615 linker_file_unload(lf,
1616 LINKER_UNLOAD_FORCE);
1617 /* we changed tailq next ptr */
1620 modlist_newmodule(modname, nver, lf);
1623 TAILQ_REMOVE(&loaded_files, lf, loaded);
1624 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1626 * Since we provided modules, we need to restart the
1627 * sort so that the previous files that depend on us
1628 * have a chance. Also, we've busted the tailq next
1629 * pointer with the REMOVE.
1636 * At this point, we check to see what could not be resolved..
1638 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1639 TAILQ_REMOVE(&loaded_files, lf, loaded);
1640 printf("KLD file %s is missing dependencies\n", lf->filename);
1641 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1645 * We made it. Finish off the linking in the order we determined.
1647 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1648 if (linker_kernel_file) {
1649 linker_kernel_file->refs++;
1650 error = linker_file_add_dependency(lf,
1651 linker_kernel_file);
1653 panic("cannot add dependency");
1655 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1658 for (mdp = start; mdp < stop; mdp++) {
1660 if (mp->md_type != MDT_DEPEND)
1662 modname = mp->md_cval;
1663 verinfo = mp->md_data;
1664 mod = modlist_lookup2(modname, verinfo);
1666 printf("KLD file %s - cannot find "
1667 "dependency \"%s\"\n",
1668 lf->filename, modname);
1671 /* Don't count self-dependencies */
1672 if (lf == mod->container)
1674 mod->container->refs++;
1675 error = linker_file_add_dependency(lf,
1678 panic("cannot add dependency");
1682 * Now do relocation etc using the symbol search paths
1683 * established by the dependencies
1685 error = LINKER_LINK_PRELOAD_FINISH(lf);
1687 printf("KLD file %s - could not finalize loading\n",
1691 linker_file_register_modules(lf);
1692 if (!TAILQ_EMPTY(&lf->modules))
1693 lf->flags |= LINKER_FILE_MODULES;
1694 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1695 &si_stop, NULL) == 0)
1696 sysinit_add(si_start, si_stop);
1697 linker_file_register_sysctls(lf, true);
1698 lf->flags |= LINKER_FILE_LINKED;
1701 TAILQ_REMOVE(&depended_files, lf, loaded);
1702 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1704 sx_xunlock(&kld_sx);
1705 /* woohoo! we made it! */
1708 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL);
1711 * Handle preload files that failed to load any modules.
1714 linker_preload_finish(void *arg)
1716 linker_file_t lf, nlf;
1719 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
1721 * If all of the modules in this file failed to load, unload
1722 * the file and return an error of ENOEXEC. (Parity with
1723 * linker_load_file.)
1725 if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
1726 TAILQ_EMPTY(&lf->modules)) {
1727 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1731 lf->flags &= ~LINKER_FILE_MODULES;
1732 lf->userrefs++; /* so we can (try to) kldunload it */
1734 sx_xunlock(&kld_sx);
1738 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
1739 * scheduled at any subsystem and order, so run this as late as possible. init
1740 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
1742 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
1743 linker_preload_finish, NULL);
1746 * Search for a not-loaded module by name.
1748 * Modules may be found in the following locations:
1750 * - preloaded (result is just the module name) - on disk (result is full path
1753 * If the module name is qualified in any way (contains path, etc.) the we
1754 * simply return a copy of it.
1756 * The search path can be manipulated via sysctl. Note that we use the ';'
1757 * character as a separator to be consistent with the bootloader.
1760 static char linker_hintfile[] = "linker.hints";
1761 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1763 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1764 sizeof(linker_path), "module load search path");
1766 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1768 static const char * const linker_ext_list[] = {
1775 * Check if file actually exists either with or without extension listed in
1776 * the linker_ext_list. (probably should be generic for the rest of the
1780 linker_lookup_file(const char *path, int pathlen, const char *name,
1781 int namelen, struct vattr *vap)
1783 struct nameidata nd;
1784 struct thread *td = curthread; /* XXX */
1785 const char * const *cpp, *sep;
1787 int error, len, extlen, reclen, flags;
1791 for (cpp = linker_ext_list; *cpp; cpp++) {
1796 extlen++; /* trailing '\0' */
1797 sep = (path[pathlen - 1] != '/') ? "/" : "";
1799 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1800 result = malloc(reclen, M_LINKER, M_WAITOK);
1801 for (cpp = linker_ext_list; *cpp; cpp++) {
1802 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1803 namelen, name, *cpp);
1805 * Attempt to open the file, and return the path if
1806 * we succeed and it's a regular file.
1808 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1810 error = vn_open(&nd, &flags, 0, NULL);
1812 NDFREE(&nd, NDF_ONLY_PNBUF);
1813 type = nd.ni_vp->v_type;
1815 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1816 VOP_UNLOCK(nd.ni_vp);
1817 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1822 free(result, M_LINKER);
1826 #define INT_ALIGN(base, ptr) ptr = \
1827 (base) + roundup2((ptr) - (base), sizeof(int))
1830 * Lookup KLD which contains requested module in the "linker.hints" file. If
1831 * version specification is available, then try to find the best KLD.
1832 * Otherwise just find the latest one.
1835 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1836 int modnamelen, const struct mod_depend *verinfo)
1838 struct thread *td = curthread; /* XXX */
1839 struct ucred *cred = td ? td->td_ucred : NULL;
1840 struct nameidata nd;
1841 struct vattr vattr, mattr;
1842 const char *best, *sep;
1843 u_char *hints = NULL;
1844 u_char *cp, *recptr, *bufend, *result, *pathbuf;
1845 int error, ival, bestver, *intp, found, flags, clen, blen;
1849 bestver = found = 0;
1851 sep = (path[pathlen - 1] != '/') ? "/" : "";
1852 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1854 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1855 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1858 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1860 error = vn_open(&nd, &flags, 0, NULL);
1863 NDFREE(&nd, NDF_ONLY_PNBUF);
1864 if (nd.ni_vp->v_type != VREG)
1867 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1871 * XXX: we need to limit this number to some reasonable value
1873 if (vattr.va_size > LINKER_HINTS_MAX) {
1874 printf("hints file too large %ld\n", (long)vattr.va_size);
1877 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1878 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1879 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1882 VOP_UNLOCK(nd.ni_vp);
1883 vn_close(nd.ni_vp, FREAD, cred, td);
1886 printf("can't read %zd\n", reclen);
1889 intp = (int *)hints;
1891 if (ival != LINKER_HINTS_VERSION) {
1892 printf("hints file version mismatch %d\n", ival);
1895 bufend = hints + vattr.va_size;
1896 recptr = (u_char *)intp;
1898 while (recptr < bufend && !found) {
1899 intp = (int *)recptr;
1906 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1909 INT_ALIGN(hints, cp);
1913 if (verinfo == NULL ||
1914 ival == verinfo->md_ver_preferred) {
1918 if (ival >= verinfo->md_ver_minimum &&
1919 ival <= verinfo->md_ver_maximum &&
1929 recptr += reclen + sizeof(int);
1932 * Finally check if KLD is in the place
1935 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1937 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1940 * KLD is newer than hints file. What we should do now?
1942 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1943 printf("warning: KLD '%s' is newer than the linker.hints"
1946 free(pathbuf, M_LINKER);
1948 free(hints, M_TEMP);
1949 if (nd.ni_vp != NULL) {
1950 VOP_UNLOCK(nd.ni_vp);
1951 vn_close(nd.ni_vp, FREAD, cred, td);
1954 * If nothing found or hints is absent - fallback to the old
1955 * way by using "kldname[.ko]" as module name.
1957 if (!found && !bestver && result == NULL)
1958 result = linker_lookup_file(path, pathlen, modname,
1964 * Lookup KLD which contains requested module in the all directories.
1967 linker_search_module(const char *modname, int modnamelen,
1968 const struct mod_depend *verinfo)
1970 char *cp, *ep, *result;
1973 * traverse the linker path
1975 for (cp = linker_path; *cp; cp = ep + 1) {
1976 /* find the end of this component */
1977 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1978 result = linker_hints_lookup(cp, ep - cp, modname,
1979 modnamelen, verinfo);
1989 * Search for module in all directories listed in the linker_path.
1992 linker_search_kld(const char *name)
1994 char *cp, *ep, *result;
1997 /* qualified at all? */
1998 if (strchr(name, '/'))
1999 return (strdup(name, M_LINKER));
2001 /* traverse the linker path */
2003 for (ep = linker_path; *ep; ep++) {
2005 /* find the end of this component */
2006 for (; *ep != 0 && *ep != ';'; ep++);
2007 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
2015 linker_basename(const char *path)
2017 const char *filename;
2019 filename = strrchr(path, '/');
2020 if (filename == NULL)
2029 * Inform hwpmc about the set of kernel modules currently loaded.
2032 linker_hwpmc_list_objects(void)
2035 struct pmckern_map_in *kobase;
2040 TAILQ_FOREACH(lf, &linker_files, link)
2043 /* Allocate nmappings + 1 entries. */
2044 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
2045 M_LINKER, M_WAITOK | M_ZERO);
2047 TAILQ_FOREACH(lf, &linker_files, link) {
2049 /* Save the info for this linker file. */
2050 kobase[i].pm_file = lf->filename;
2051 kobase[i].pm_address = (uintptr_t)lf->address;
2054 sx_sunlock(&kld_sx);
2056 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
2058 /* The last entry of the malloced area comprises of all zeros. */
2059 KASSERT(kobase[i].pm_file == NULL,
2060 ("linker_hwpmc_list_objects: last object not NULL"));
2062 return ((void *)kobase);
2066 /* check if root file system is not mounted */
2068 linker_root_mounted(void)
2073 if (rootvnode == NULL)
2076 pwd = pwd_hold(curthread);
2077 ret = pwd->pwd_rdir != NULL;
2083 * Find a file which contains given module and load it, if "parent" is not
2084 * NULL, register a reference to it.
2087 linker_load_module(const char *kldname, const char *modname,
2088 struct linker_file *parent, const struct mod_depend *verinfo,
2089 struct linker_file **lfpp)
2091 linker_file_t lfdep;
2092 const char *filename;
2096 sx_assert(&kld_sx, SA_XLOCKED);
2097 if (modname == NULL) {
2099 * We have to load KLD
2101 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2103 if (!linker_root_mounted())
2105 pathname = linker_search_kld(kldname);
2107 if (modlist_lookup2(modname, verinfo) != NULL)
2109 if (!linker_root_mounted())
2111 if (kldname != NULL)
2112 pathname = strdup(kldname, M_LINKER);
2115 * Need to find a KLD with required module
2117 pathname = linker_search_module(modname,
2118 strlen(modname), verinfo);
2120 if (pathname == NULL)
2124 * Can't load more than one file with the same basename XXX:
2125 * Actually it should be possible to have multiple KLDs with
2126 * the same basename but different path because they can
2127 * provide different versions of the same modules.
2129 filename = linker_basename(pathname);
2130 if (linker_find_file_by_name(filename))
2133 error = linker_load_file(pathname, &lfdep);
2136 if (modname && verinfo &&
2137 modlist_lookup2(modname, verinfo) == NULL) {
2138 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2143 error = linker_file_add_dependency(parent, lfdep);
2150 free(pathname, M_LINKER);
2155 * This routine is responsible for finding dependencies of userland initiated
2156 * kldload(2)'s of files.
2159 linker_load_dependencies(linker_file_t lf)
2161 linker_file_t lfdep;
2162 struct mod_metadata **start, **stop, **mdp, **nmdp;
2163 struct mod_metadata *mp, *nmp;
2164 const struct mod_depend *verinfo;
2166 const char *modname, *nmodname;
2170 * All files are dependent on /kernel.
2172 sx_assert(&kld_sx, SA_XLOCKED);
2173 if (linker_kernel_file) {
2174 linker_kernel_file->refs++;
2175 error = linker_file_add_dependency(lf, linker_kernel_file);
2179 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2182 for (mdp = start; mdp < stop; mdp++) {
2184 if (mp->md_type != MDT_VERSION)
2186 modname = mp->md_cval;
2187 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2188 mod = modlist_lookup(modname, ver);
2190 printf("interface %s.%d already present in the KLD"
2191 " '%s'!\n", modname, ver,
2192 mod->container->filename);
2197 for (mdp = start; mdp < stop; mdp++) {
2199 if (mp->md_type != MDT_DEPEND)
2201 modname = mp->md_cval;
2202 verinfo = mp->md_data;
2204 for (nmdp = start; nmdp < stop; nmdp++) {
2206 if (nmp->md_type != MDT_VERSION)
2208 nmodname = nmp->md_cval;
2209 if (strcmp(modname, nmodname) == 0)
2212 if (nmdp < stop)/* early exit, it's a self reference */
2214 mod = modlist_lookup2(modname, verinfo);
2215 if (mod) { /* woohoo, it's loaded already */
2216 lfdep = mod->container;
2218 error = linker_file_add_dependency(lf, lfdep);
2223 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2225 printf("KLD %s: depends on %s - not available or"
2226 " version mismatch\n", lf->filename, modname);
2233 linker_addmodules(lf, start, stop, 0);
2238 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2240 struct sysctl_req *req;
2243 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2247 * Export a nul-separated, double-nul-terminated list of all function names
2251 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2257 error = mac_kld_check_stat(req->td->td_ucred);
2261 error = sysctl_wire_old_buffer(req, 0);
2265 TAILQ_FOREACH(lf, &linker_files, link) {
2266 error = LINKER_EACH_FUNCTION_NAME(lf,
2267 sysctl_kern_function_list_iterate, req);
2269 sx_xunlock(&kld_sx);
2273 sx_xunlock(&kld_sx);
2274 return (SYSCTL_OUT(req, "", 1));
2277 SYSCTL_PROC(_kern, OID_AUTO, function_list,
2278 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
2279 sysctl_kern_function_list, "",
2280 "kernel function list");