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;
631 STAILQ_INIT(&lf->common);
632 TAILQ_INIT(&lf->modules);
633 TAILQ_INSERT_TAIL(&linker_files, lf, link);
638 linker_file_unload(linker_file_t file, int flags)
641 modlist_t ml, nextml;
642 struct common_symbol *cp;
645 /* Refuse to unload modules if securelevel raised. */
646 if (prison0.pr_securelevel > 0)
649 sx_assert(&kld_sx, SA_XLOCKED);
650 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
652 /* Easy case of just dropping a reference. */
653 if (file->refs > 1) {
658 /* Give eventhandlers a chance to prevent the unload. */
660 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
664 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
665 " informing modules\n"));
668 * Quiesce all the modules to give them a chance to veto the unload.
671 for (mod = TAILQ_FIRST(&file->modules); mod;
672 mod = module_getfnext(mod)) {
674 error = module_quiesce(mod);
675 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
676 KLD_DPF(FILE, ("linker_file_unload: module %s"
677 " vetoed unload\n", module_getname(mod)));
679 * XXX: Do we need to tell all the quiesced modules
680 * that they can resume work now via a new module
690 * Inform any modules associated with this file that they are
694 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
695 next = module_getfnext(mod);
699 * Give the module a chance to veto the unload.
701 if ((error = module_unload(mod)) != 0) {
704 KLD_DPF(FILE, ("linker_file_unload: module %s"
705 " failed unload\n", module_getname(mod)));
715 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
716 if (ml->container == file) {
717 TAILQ_REMOVE(&found_modules, ml, link);
723 * Don't try to run SYSUNINITs if we are unloaded due to a
726 if (file->flags & LINKER_FILE_LINKED) {
727 file->flags &= ~LINKER_FILE_LINKED;
728 linker_file_unregister_sysctls(file);
729 linker_file_sysuninit(file);
731 TAILQ_REMOVE(&linker_files, file, link);
734 for (i = 0; i < file->ndeps; i++)
735 linker_file_unload(file->deps[i], flags);
736 free(file->deps, M_LINKER);
739 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
740 STAILQ_REMOVE_HEAD(&file->common, link);
746 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
749 if (file->filename) {
750 free(file->filename, M_LINKER);
751 file->filename = NULL;
753 if (file->pathname) {
754 free(file->pathname, M_LINKER);
755 file->pathname = NULL;
757 kobj_delete((kobj_t) file, M_LINKER);
762 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
764 return (LINKER_CTF_GET(file, lc));
768 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
770 linker_file_t *newdeps;
772 sx_assert(&kld_sx, SA_XLOCKED);
773 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
774 M_LINKER, M_WAITOK | M_ZERO);
775 file->deps[file->ndeps] = dep;
777 KLD_DPF(FILE, ("linker_file_add_dependency:"
778 " adding %s as dependency for %s\n",
779 dep->filename, file->filename));
784 * Locate a linker set and its contents. This is a helper function to avoid
785 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
786 * This function is used in this file so we can avoid having lots of (void **)
790 linker_file_lookup_set(linker_file_t file, const char *name,
791 void *firstp, void *lastp, int *countp)
794 sx_assert(&kld_sx, SA_LOCKED);
795 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
799 * List all functions in a file.
802 linker_file_function_listall(linker_file_t lf,
803 linker_function_nameval_callback_t callback_func, void *arg)
805 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
809 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
814 locked = sx_xlocked(&kld_sx);
817 sym = linker_file_lookup_symbol_internal(file, name, deps);
824 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
828 linker_symval_t symval;
830 size_t common_size = 0;
833 sx_assert(&kld_sx, SA_XLOCKED);
834 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
837 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
838 LINKER_SYMBOL_VALUES(file, sym, &symval);
839 if (symval.value == 0)
841 * For commons, first look them up in the
842 * dependencies and only allocate space if not found
845 common_size = symval.size;
847 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
848 ".value=%p\n", symval.value));
849 return (symval.value);
853 for (i = 0; i < file->ndeps; i++) {
854 address = linker_file_lookup_symbol_internal(
855 file->deps[i], name, 0);
857 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
858 " deps value=%p\n", address));
863 if (common_size > 0) {
865 * This is a common symbol which was not found in the
866 * dependencies. We maintain a simple common symbol table in
869 struct common_symbol *cp;
871 STAILQ_FOREACH(cp, &file->common, link) {
872 if (strcmp(cp->name, name) == 0) {
873 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
874 " old common value=%p\n", cp->address));
875 return (cp->address);
879 * Round the symbol size up to align.
881 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
882 cp = malloc(sizeof(struct common_symbol)
883 + common_size + strlen(name) + 1, M_LINKER,
885 cp->address = (caddr_t)(cp + 1);
886 cp->name = cp->address + common_size;
887 strcpy(cp->name, name);
888 bzero(cp->address, common_size);
889 STAILQ_INSERT_TAIL(&file->common, cp, link);
891 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
892 " value=%p\n", cp->address));
893 return (cp->address);
895 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
900 * Both DDB and stack(9) rely on the kernel linker to provide forward and
901 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
902 * do this in a lockfree manner. We provide a set of internal helper
903 * routines to perform these operations without locks, and then wrappers that
906 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
910 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
914 TAILQ_FOREACH(lf, &linker_files, link) {
915 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
923 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
926 c_linker_sym_t best, es;
927 u_long diff, bestdiff, off;
930 off = (uintptr_t)value;
932 TAILQ_FOREACH(lf, &linker_files, link) {
933 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
935 if (es != 0 && diff < bestdiff) {
954 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
958 TAILQ_FOREACH(lf, &linker_files, link) {
959 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
966 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
969 linker_symval_t symval;
974 error = linker_debug_search_symbol(value, &sym, offset);
977 error = linker_debug_symbol_values(sym, &symval);
980 strlcpy(buf, symval.name, buflen);
985 * DDB Helpers. DDB has to look across multiple files with their own symbol
986 * tables and string tables.
988 * Note that we do not obey list locking protocols here. We really don't need
989 * DDB to hang because somebody's got the lock held. We'll take the chance
990 * that the files list is inconsistent instead.
994 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
997 return (linker_debug_lookup(symstr, sym));
1002 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
1005 return (linker_debug_search_symbol(value, sym, diffp));
1009 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1012 return (linker_debug_symbol_values(sym, symval));
1016 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1020 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1024 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1025 * obey locking protocols, and offer a significantly less complex interface.
1028 linker_search_symbol_name_flags(caddr_t value, char *buf, u_int buflen,
1029 long *offset, int flags)
1033 KASSERT((flags & (M_NOWAIT | M_WAITOK)) != 0 &&
1034 (flags & (M_NOWAIT | M_WAITOK)) != (M_NOWAIT | M_WAITOK),
1035 ("%s: bad flags: 0x%x", __func__, flags));
1037 if (flags & M_NOWAIT) {
1038 if (!sx_try_slock(&kld_sx))
1039 return (EWOULDBLOCK);
1043 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1044 sx_sunlock(&kld_sx);
1049 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1053 return (linker_search_symbol_name_flags(value, buf, buflen, offset,
1061 kern_kldload(struct thread *td, const char *file, int *fileid)
1063 const char *kldname, *modname;
1067 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1070 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1074 * It is possible that kldloaded module will attach a new ifnet,
1075 * so vnet context must be set when this ocurs.
1077 CURVNET_SET(TD_TO_VNET(td));
1080 * If file does not contain a qualified name or any dot in it
1081 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1084 if (strchr(file, '/') || strchr(file, '.')) {
1093 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1095 sx_xunlock(&kld_sx);
1101 sx_xunlock(&kld_sx);
1109 sys_kldload(struct thread *td, struct kldload_args *uap)
1111 char *pathname = NULL;
1114 td->td_retval[0] = -1;
1116 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1117 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1119 error = kern_kldload(td, pathname, &fileid);
1121 td->td_retval[0] = fileid;
1123 free(pathname, M_TEMP);
1128 kern_kldunload(struct thread *td, int fileid, int flags)
1133 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1136 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1139 CURVNET_SET(TD_TO_VNET(td));
1141 lf = linker_find_file_by_id(fileid);
1143 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1145 if (lf->userrefs == 0) {
1147 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1149 printf("kldunload: attempt to unload file that was"
1150 " loaded by the kernel\n");
1154 error = linker_file_unload(lf, flags);
1160 sx_xunlock(&kld_sx);
1167 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1170 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1174 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1177 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1178 uap->flags != LINKER_UNLOAD_FORCE)
1180 return (kern_kldunload(td, uap->fileid, uap->flags));
1184 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1187 const char *filename;
1192 error = mac_kld_check_stat(td->td_ucred);
1197 td->td_retval[0] = -1;
1199 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1200 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1203 filename = linker_basename(pathname);
1205 lf = linker_find_file_by_name(filename);
1207 td->td_retval[0] = lf->id;
1210 sx_xunlock(&kld_sx);
1212 free(pathname, M_TEMP);
1217 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1223 error = mac_kld_check_stat(td->td_ucred);
1229 if (uap->fileid == 0)
1230 lf = TAILQ_FIRST(&linker_files);
1232 lf = linker_find_file_by_id(uap->fileid);
1237 lf = TAILQ_NEXT(lf, link);
1240 /* Skip partially loaded files. */
1241 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1242 lf = TAILQ_NEXT(lf, link);
1245 td->td_retval[0] = lf->id;
1247 td->td_retval[0] = 0;
1249 sx_xunlock(&kld_sx);
1254 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1256 struct kld_file_stat *stat;
1260 * Check the version of the user's structure.
1262 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1265 if (version != sizeof(struct kld_file_stat_1) &&
1266 version != sizeof(struct kld_file_stat))
1269 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1270 error = kern_kldstat(td, uap->fileid, stat);
1272 error = copyout(stat, uap->stat, version);
1278 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1285 error = mac_kld_check_stat(td->td_ucred);
1291 lf = linker_find_file_by_id(fileid);
1293 sx_xunlock(&kld_sx);
1297 /* Version 1 fields: */
1298 namelen = strlen(lf->filename) + 1;
1299 if (namelen > sizeof(stat->name))
1300 namelen = sizeof(stat->name);
1301 bcopy(lf->filename, &stat->name[0], namelen);
1302 stat->refs = lf->refs;
1304 stat->address = lf->address;
1305 stat->size = lf->size;
1306 /* Version 2 fields: */
1307 namelen = strlen(lf->pathname) + 1;
1308 if (namelen > sizeof(stat->pathname))
1309 namelen = sizeof(stat->pathname);
1310 bcopy(lf->pathname, &stat->pathname[0], namelen);
1311 sx_xunlock(&kld_sx);
1313 td->td_retval[0] = 0;
1318 DB_COMMAND(kldstat, db_kldstat)
1322 #define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1323 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1324 #undef POINTER_WIDTH
1325 TAILQ_FOREACH(lf, &linker_files, link) {
1328 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1329 lf->address, lf->size, lf->filename);
1335 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1342 error = mac_kld_check_stat(td->td_ucred);
1348 lf = linker_find_file_by_id(uap->fileid);
1351 mp = TAILQ_FIRST(&lf->modules);
1353 td->td_retval[0] = module_getid(mp);
1355 td->td_retval[0] = 0;
1359 sx_xunlock(&kld_sx);
1364 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1366 char *symstr = NULL;
1368 linker_symval_t symval;
1370 struct kld_sym_lookup lookup;
1374 error = mac_kld_check_stat(td->td_ucred);
1379 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1381 if (lookup.version != sizeof(lookup) ||
1382 uap->cmd != KLDSYM_LOOKUP)
1384 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1385 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1388 if (uap->fileid != 0) {
1389 lf = linker_find_file_by_id(uap->fileid);
1392 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1393 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1394 lookup.symvalue = (uintptr_t) symval.value;
1395 lookup.symsize = symval.size;
1396 error = copyout(&lookup, uap->data, sizeof(lookup));
1400 TAILQ_FOREACH(lf, &linker_files, link) {
1401 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1402 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1403 lookup.symvalue = (uintptr_t)symval.value;
1404 lookup.symsize = symval.size;
1405 error = copyout(&lookup, uap->data,
1413 sx_xunlock(&kld_sx);
1415 free(symstr, M_TEMP);
1420 * Preloaded module support
1424 modlist_lookup(const char *name, int ver)
1428 TAILQ_FOREACH(mod, &found_modules, link) {
1429 if (strcmp(mod->name, name) == 0 &&
1430 (ver == 0 || mod->version == ver))
1437 modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1439 modlist_t mod, bestmod;
1442 if (verinfo == NULL)
1443 return (modlist_lookup(name, 0));
1445 TAILQ_FOREACH(mod, &found_modules, link) {
1446 if (strcmp(mod->name, name) != 0)
1449 if (ver == verinfo->md_ver_preferred)
1451 if (ver >= verinfo->md_ver_minimum &&
1452 ver <= verinfo->md_ver_maximum &&
1453 (bestmod == NULL || ver > bestmod->version))
1460 modlist_newmodule(const char *modname, int version, linker_file_t container)
1464 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1466 panic("no memory for module list");
1467 mod->container = container;
1468 mod->name = modname;
1469 mod->version = version;
1470 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1475 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1476 struct mod_metadata **stop, int preload)
1478 struct mod_metadata *mp, **mdp;
1479 const char *modname;
1482 for (mdp = start; mdp < stop; mdp++) {
1484 if (mp->md_type != MDT_VERSION)
1486 modname = mp->md_cval;
1487 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1488 if (modlist_lookup(modname, ver) != NULL) {
1489 printf("module %s already present!\n", modname);
1490 /* XXX what can we do? this is a build error. :-( */
1493 modlist_newmodule(modname, ver, lf);
1498 linker_preload(void *arg)
1501 const char *modname, *nmodname;
1503 linker_file_t lf, nlf;
1506 linker_file_list_t loaded_files;
1507 linker_file_list_t depended_files;
1508 struct mod_metadata *mp, *nmp;
1509 struct mod_metadata **start, **stop, **mdp, **nmdp;
1510 const struct mod_depend *verinfo;
1514 struct sysinit **si_start, **si_stop;
1516 TAILQ_INIT(&loaded_files);
1517 TAILQ_INIT(&depended_files);
1518 TAILQ_INIT(&found_modules);
1523 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1524 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1525 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1526 if (modname == NULL) {
1527 printf("Preloaded module at %p does not have a"
1528 " name!\n", modptr);
1531 if (modtype == NULL) {
1532 printf("Preloaded module at %p does not have a type!\n",
1537 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1540 TAILQ_FOREACH(lc, &classes, link) {
1541 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1547 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1551 * First get a list of stuff in the kernel.
1553 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1555 linker_addmodules(linker_kernel_file, start, stop, 1);
1558 * This is a once-off kinky bubble sort to resolve relocation
1559 * dependency requirements.
1562 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1563 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1566 * First, look to see if we would successfully link with this
1569 resolves = 1; /* unless we know otherwise */
1571 for (mdp = start; mdp < stop; mdp++) {
1573 if (mp->md_type != MDT_DEPEND)
1575 modname = mp->md_cval;
1576 verinfo = mp->md_data;
1577 for (nmdp = start; nmdp < stop; nmdp++) {
1579 if (nmp->md_type != MDT_VERSION)
1581 nmodname = nmp->md_cval;
1582 if (strcmp(modname, nmodname) == 0)
1585 if (nmdp < stop) /* it's a self reference */
1589 * ok, the module isn't here yet, we
1592 if (modlist_lookup2(modname, verinfo) == NULL)
1597 * OK, if we found our modules, we can link. So, "provide"
1598 * the modules inside and add it to the end of the link order
1603 for (mdp = start; mdp < stop; mdp++) {
1605 if (mp->md_type != MDT_VERSION)
1607 modname = mp->md_cval;
1608 nver = ((const struct mod_version *)
1609 mp->md_data)->mv_version;
1610 if (modlist_lookup(modname,
1612 printf("module %s already"
1613 " present!\n", modname);
1614 TAILQ_REMOVE(&loaded_files,
1616 linker_file_unload(lf,
1617 LINKER_UNLOAD_FORCE);
1618 /* we changed tailq next ptr */
1621 modlist_newmodule(modname, nver, lf);
1624 TAILQ_REMOVE(&loaded_files, lf, loaded);
1625 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1627 * Since we provided modules, we need to restart the
1628 * sort so that the previous files that depend on us
1629 * have a chance. Also, we've busted the tailq next
1630 * pointer with the REMOVE.
1637 * At this point, we check to see what could not be resolved..
1639 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1640 TAILQ_REMOVE(&loaded_files, lf, loaded);
1641 printf("KLD file %s is missing dependencies\n", lf->filename);
1642 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1646 * We made it. Finish off the linking in the order we determined.
1648 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1649 if (linker_kernel_file) {
1650 linker_kernel_file->refs++;
1651 error = linker_file_add_dependency(lf,
1652 linker_kernel_file);
1654 panic("cannot add dependency");
1656 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1659 for (mdp = start; mdp < stop; mdp++) {
1661 if (mp->md_type != MDT_DEPEND)
1663 modname = mp->md_cval;
1664 verinfo = mp->md_data;
1665 mod = modlist_lookup2(modname, verinfo);
1667 printf("KLD file %s - cannot find "
1668 "dependency \"%s\"\n",
1669 lf->filename, modname);
1672 /* Don't count self-dependencies */
1673 if (lf == mod->container)
1675 mod->container->refs++;
1676 error = linker_file_add_dependency(lf,
1679 panic("cannot add dependency");
1683 * Now do relocation etc using the symbol search paths
1684 * established by the dependencies
1686 error = LINKER_LINK_PRELOAD_FINISH(lf);
1688 printf("KLD file %s - could not finalize loading\n",
1692 linker_file_register_modules(lf);
1693 if (!TAILQ_EMPTY(&lf->modules))
1694 lf->flags |= LINKER_FILE_MODULES;
1695 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1696 &si_stop, NULL) == 0)
1697 sysinit_add(si_start, si_stop);
1698 linker_file_register_sysctls(lf, true);
1699 lf->flags |= LINKER_FILE_LINKED;
1702 TAILQ_REMOVE(&depended_files, lf, loaded);
1703 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1705 sx_xunlock(&kld_sx);
1706 /* woohoo! we made it! */
1709 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, NULL);
1712 * Handle preload files that failed to load any modules.
1715 linker_preload_finish(void *arg)
1717 linker_file_t lf, nlf;
1720 TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
1722 * If all of the modules in this file failed to load, unload
1723 * the file and return an error of ENOEXEC. (Parity with
1724 * linker_load_file.)
1726 if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
1727 TAILQ_EMPTY(&lf->modules)) {
1728 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1732 lf->flags &= ~LINKER_FILE_MODULES;
1733 lf->userrefs++; /* so we can (try to) kldunload it */
1735 sx_xunlock(&kld_sx);
1739 * Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
1740 * scheduled at any subsystem and order, so run this as late as possible. init
1741 * becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
1743 SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
1744 linker_preload_finish, NULL);
1747 * Search for a not-loaded module by name.
1749 * Modules may be found in the following locations:
1751 * - preloaded (result is just the module name) - on disk (result is full path
1754 * If the module name is qualified in any way (contains path, etc.) the we
1755 * simply return a copy of it.
1757 * The search path can be manipulated via sysctl. Note that we use the ';'
1758 * character as a separator to be consistent with the bootloader.
1761 static char linker_hintfile[] = "linker.hints";
1762 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1764 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,
1765 sizeof(linker_path), "module load search path");
1767 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1769 static char *linker_ext_list[] = {
1776 * Check if file actually exists either with or without extension listed in
1777 * the linker_ext_list. (probably should be generic for the rest of the
1781 linker_lookup_file(const char *path, int pathlen, const char *name,
1782 int namelen, struct vattr *vap)
1784 struct nameidata nd;
1785 struct thread *td = curthread; /* XXX */
1786 char *result, **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, 0);
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 u_char *hints = NULL;
1843 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
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("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, 0);
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("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, 0);
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);
2066 * Find a file which contains given module and load it, if "parent" is not
2067 * NULL, register a reference to it.
2070 linker_load_module(const char *kldname, const char *modname,
2071 struct linker_file *parent, const struct mod_depend *verinfo,
2072 struct linker_file **lfpp)
2074 linker_file_t lfdep;
2075 const char *filename;
2079 sx_assert(&kld_sx, SA_XLOCKED);
2080 if (modname == NULL) {
2082 * We have to load KLD
2084 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2086 /* check if root file system is not mounted */
2087 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL)
2089 pathname = linker_search_kld(kldname);
2091 if (modlist_lookup2(modname, verinfo) != NULL)
2093 /* check if root file system is not mounted */
2094 if (rootvnode == NULL || curproc->p_fd->fd_rdir == NULL)
2096 if (kldname != NULL)
2097 pathname = strdup(kldname, M_LINKER);
2100 * Need to find a KLD with required module
2102 pathname = linker_search_module(modname,
2103 strlen(modname), verinfo);
2105 if (pathname == NULL)
2109 * Can't load more than one file with the same basename XXX:
2110 * Actually it should be possible to have multiple KLDs with
2111 * the same basename but different path because they can
2112 * provide different versions of the same modules.
2114 filename = linker_basename(pathname);
2115 if (linker_find_file_by_name(filename))
2118 error = linker_load_file(pathname, &lfdep);
2121 if (modname && verinfo &&
2122 modlist_lookup2(modname, verinfo) == NULL) {
2123 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2128 error = linker_file_add_dependency(parent, lfdep);
2135 free(pathname, M_LINKER);
2140 * This routine is responsible for finding dependencies of userland initiated
2141 * kldload(2)'s of files.
2144 linker_load_dependencies(linker_file_t lf)
2146 linker_file_t lfdep;
2147 struct mod_metadata **start, **stop, **mdp, **nmdp;
2148 struct mod_metadata *mp, *nmp;
2149 const struct mod_depend *verinfo;
2151 const char *modname, *nmodname;
2155 * All files are dependent on /kernel.
2157 sx_assert(&kld_sx, SA_XLOCKED);
2158 if (linker_kernel_file) {
2159 linker_kernel_file->refs++;
2160 error = linker_file_add_dependency(lf, linker_kernel_file);
2164 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2167 for (mdp = start; mdp < stop; mdp++) {
2169 if (mp->md_type != MDT_VERSION)
2171 modname = mp->md_cval;
2172 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2173 mod = modlist_lookup(modname, ver);
2175 printf("interface %s.%d already present in the KLD"
2176 " '%s'!\n", modname, ver,
2177 mod->container->filename);
2182 for (mdp = start; mdp < stop; mdp++) {
2184 if (mp->md_type != MDT_DEPEND)
2186 modname = mp->md_cval;
2187 verinfo = mp->md_data;
2189 for (nmdp = start; nmdp < stop; nmdp++) {
2191 if (nmp->md_type != MDT_VERSION)
2193 nmodname = nmp->md_cval;
2194 if (strcmp(modname, nmodname) == 0)
2197 if (nmdp < stop)/* early exit, it's a self reference */
2199 mod = modlist_lookup2(modname, verinfo);
2200 if (mod) { /* woohoo, it's loaded already */
2201 lfdep = mod->container;
2203 error = linker_file_add_dependency(lf, lfdep);
2208 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2210 printf("KLD %s: depends on %s - not available or"
2211 " version mismatch\n", lf->filename, modname);
2218 linker_addmodules(lf, start, stop, 0);
2223 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2225 struct sysctl_req *req;
2228 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2232 * Export a nul-separated, double-nul-terminated list of all function names
2236 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2242 error = mac_kld_check_stat(req->td->td_ucred);
2246 error = sysctl_wire_old_buffer(req, 0);
2250 TAILQ_FOREACH(lf, &linker_files, link) {
2251 error = LINKER_EACH_FUNCTION_NAME(lf,
2252 sysctl_kern_function_list_iterate, req);
2254 sx_xunlock(&kld_sx);
2258 sx_xunlock(&kld_sx);
2259 return (SYSCTL_OUT(req, "", 1));
2262 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2263 NULL, 0, sysctl_kern_function_list, "", "kernel function list");