2 * Copyright (c) 1997-2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include "opt_hwpmc_hooks.h"
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
38 #include <sys/sysproto.h>
39 #include <sys/sysent.h>
43 #include <sys/mutex.h>
45 #include <sys/module.h>
46 #include <sys/mount.h>
47 #include <sys/linker.h>
48 #include <sys/eventhandler.h>
49 #include <sys/fcntl.h>
51 #include <sys/libkern.h>
52 #include <sys/namei.h>
53 #include <sys/vnode.h>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysctl.h>
59 #include <security/mac/mac_framework.h>
61 #include "linker_if.h"
64 #include <sys/pmckern.h>
69 SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RW | CTLFLAG_TUN,
70 &kld_debug, 0, "Set various levels of KLD debug");
71 TUNABLE_INT("debug.kld_debug", &kld_debug);
74 /* These variables are used by kernel debuggers to enumerate loaded files. */
75 const int kld_off_address = offsetof(struct linker_file, address);
76 const int kld_off_filename = offsetof(struct linker_file, filename);
77 const int kld_off_pathname = offsetof(struct linker_file, pathname);
78 const int kld_off_next = offsetof(struct linker_file, link.tqe_next);
81 * static char *linker_search_path(const char *name, struct mod_depend
84 static const char *linker_basename(const char *path);
87 * Find a currently loaded file given its filename.
89 static linker_file_t linker_find_file_by_name(const char* _filename);
92 * Find a currently loaded file given its file id.
94 static linker_file_t linker_find_file_by_id(int _fileid);
96 /* Metadata from the static kernel */
97 SET_DECLARE(modmetadata_set, struct mod_metadata);
99 MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
101 linker_file_t linker_kernel_file;
103 static struct sx kld_sx; /* kernel linker lock */
106 * Load counter used by clients to determine if a linker file has been
107 * re-loaded. This counter is incremented for each file load.
111 static linker_class_list_t classes;
112 static linker_file_list_t linker_files;
113 static int next_file_id = 1;
114 static int linker_no_more_classes = 0;
116 #define LINKER_GET_NEXT_FILE_ID(a) do { \
117 linker_file_t lftmp; \
120 sx_assert(&kld_sx, SA_XLOCKED); \
122 TAILQ_FOREACH(lftmp, &linker_files, link) { \
123 if (next_file_id == lftmp->id) { \
128 (a) = next_file_id; \
132 /* XXX wrong name; we're looking at version provision tags here, not modules */
133 typedef TAILQ_HEAD(, modlist) modlisthead_t;
135 TAILQ_ENTRY(modlist) link; /* chain together all modules */
136 linker_file_t container;
140 typedef struct modlist *modlist_t;
141 static modlisthead_t found_modules;
143 static int linker_file_add_dependency(linker_file_t file,
145 static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
146 const char* name, int deps);
147 static int linker_load_module(const char *kldname,
148 const char *modname, struct linker_file *parent,
149 struct mod_depend *verinfo, struct linker_file **lfpp);
150 static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo);
153 linker_init(void *arg)
156 sx_init(&kld_sx, "kernel linker");
157 TAILQ_INIT(&classes);
158 TAILQ_INIT(&linker_files);
161 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
164 linker_stop_class_add(void *arg)
167 linker_no_more_classes = 1;
170 SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
173 linker_add_class(linker_class_t lc)
177 * We disallow any class registration past SI_ORDER_ANY
178 * of SI_SUB_KLD. We bump the reference count to keep the
179 * ops from being freed.
181 if (linker_no_more_classes == 1)
183 kobj_class_compile((kobj_class_t) lc);
184 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
185 TAILQ_INSERT_TAIL(&classes, lc, link);
190 linker_file_sysinit(linker_file_t lf)
192 struct sysinit **start, **stop, **sipp, **xipp, *save;
194 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
197 sx_assert(&kld_sx, SA_XLOCKED);
199 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
202 * Perform a bubble sort of the system initialization objects by
203 * their subsystem (primary key) and order (secondary key).
205 * Since some things care about execution order, this is the operation
206 * which ensures continued function.
208 for (sipp = start; sipp < stop; sipp++) {
209 for (xipp = sipp + 1; xipp < stop; xipp++) {
210 if ((*sipp)->subsystem < (*xipp)->subsystem ||
211 ((*sipp)->subsystem == (*xipp)->subsystem &&
212 (*sipp)->order <= (*xipp)->order))
221 * Traverse the (now) ordered list of system initialization tasks.
222 * Perform each task, and continue on to the next task.
226 for (sipp = start; sipp < stop; sipp++) {
227 if ((*sipp)->subsystem == SI_SUB_DUMMY)
228 continue; /* skip dummy task(s) */
231 (*((*sipp)->func)) ((*sipp)->udata);
238 linker_file_sysuninit(linker_file_t lf)
240 struct sysinit **start, **stop, **sipp, **xipp, *save;
242 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
245 sx_assert(&kld_sx, SA_XLOCKED);
247 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
252 * Perform a reverse bubble sort of the system initialization objects
253 * by their subsystem (primary key) and order (secondary key).
255 * Since some things care about execution order, this is the operation
256 * which ensures continued function.
258 for (sipp = start; sipp < stop; sipp++) {
259 for (xipp = sipp + 1; xipp < stop; xipp++) {
260 if ((*sipp)->subsystem > (*xipp)->subsystem ||
261 ((*sipp)->subsystem == (*xipp)->subsystem &&
262 (*sipp)->order >= (*xipp)->order))
271 * Traverse the (now) ordered list of system initialization tasks.
272 * Perform each task, and continue on to the next task.
276 for (sipp = start; sipp < stop; sipp++) {
277 if ((*sipp)->subsystem == SI_SUB_DUMMY)
278 continue; /* skip dummy task(s) */
281 (*((*sipp)->func)) ((*sipp)->udata);
288 linker_file_register_sysctls(linker_file_t lf, bool enable)
290 struct sysctl_oid **start, **stop, **oidp;
293 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
296 sx_assert(&kld_sx, SA_XLOCKED);
298 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
303 for (oidp = start; oidp < stop; oidp++) {
305 sysctl_register_oid(*oidp);
307 sysctl_register_disabled_oid(*oidp);
314 linker_file_enable_sysctls(linker_file_t lf)
316 struct sysctl_oid **start, **stop, **oidp;
319 ("linker_file_enable_sysctls: enable SYSCTLs for %s\n",
322 sx_assert(&kld_sx, SA_XLOCKED);
324 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
329 for (oidp = start; oidp < stop; oidp++)
330 sysctl_enable_oid(*oidp);
336 linker_file_unregister_sysctls(linker_file_t lf)
338 struct sysctl_oid **start, **stop, **oidp;
340 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
341 " for %s\n", lf->filename));
343 sx_assert(&kld_sx, SA_XLOCKED);
345 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
350 for (oidp = start; oidp < stop; oidp++)
351 sysctl_unregister_oid(*oidp);
357 linker_file_register_modules(linker_file_t lf)
359 struct mod_metadata **start, **stop, **mdp;
360 const moduledata_t *moddata;
361 int first_error, error;
363 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
364 " in %s\n", lf->filename));
366 sx_assert(&kld_sx, SA_XLOCKED);
368 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
371 * This fallback should be unnecessary, but if we get booted
372 * from boot2 instead of loader and we are missing our
373 * metadata then we have to try the best we can.
375 if (lf == linker_kernel_file) {
376 start = SET_BEGIN(modmetadata_set);
377 stop = SET_LIMIT(modmetadata_set);
382 for (mdp = start; mdp < stop; mdp++) {
383 if ((*mdp)->md_type != MDT_MODULE)
385 moddata = (*mdp)->md_data;
386 KLD_DPF(FILE, ("Registering module %s in %s\n",
387 moddata->name, lf->filename));
388 error = module_register(moddata, lf);
390 printf("Module %s failed to register: %d\n",
391 moddata->name, error);
392 if (first_error == 0)
396 return (first_error);
400 linker_init_kernel_modules(void)
404 linker_file_register_modules(linker_kernel_file);
408 SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
412 linker_load_file(const char *filename, linker_file_t *result)
416 int foundfile, error, modules;
418 /* Refuse to load modules if securelevel raised */
419 if (prison0.pr_securelevel > 0)
422 sx_assert(&kld_sx, SA_XLOCKED);
423 lf = linker_find_file_by_name(filename);
425 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
426 " incrementing refs\n", filename));
435 * We do not need to protect (lock) classes here because there is
436 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
437 * and there is no class deregistration mechanism at this time.
439 TAILQ_FOREACH(lc, &classes, link) {
440 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
442 error = LINKER_LOAD_FILE(lc, filename, &lf);
444 * If we got something other than ENOENT, then it exists but
445 * we cannot load it for some other reason.
450 error = linker_file_register_modules(lf);
451 if (error == EEXIST) {
452 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
455 modules = !TAILQ_EMPTY(&lf->modules);
456 linker_file_register_sysctls(lf, false);
457 linker_file_sysinit(lf);
458 lf->flags |= LINKER_FILE_LINKED;
461 * If all of the modules in this file failed
462 * to load, unload the file and return an
465 if (modules && TAILQ_EMPTY(&lf->modules)) {
466 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
469 linker_file_enable_sysctls(lf);
470 EVENTHANDLER_INVOKE(kld_load, lf);
476 * Less than ideal, but tells the user whether it failed to load or
477 * the module was not found.
482 * If the file type has not been recognized by the last try
483 * printout a message before to fail.
486 printf("linker_load_file: Unsupported file type\n");
489 * Format not recognized or otherwise unloadable.
490 * When loading a module that is statically built into
491 * the kernel EEXIST percolates back up as the return
492 * value. Preserve this so that apps like sysinstall
493 * can recognize this special case and not post bogus
499 error = ENOENT; /* Nothing found */
504 linker_reference_module(const char *modname, struct mod_depend *verinfo,
505 linker_file_t *result)
511 if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
512 *result = mod->container;
518 error = linker_load_module(NULL, modname, NULL, verinfo, result);
524 linker_release_module(const char *modname, struct mod_depend *verinfo,
532 KASSERT(modname != NULL,
533 ("linker_release_module: no file or name"));
534 mod = modlist_lookup2(modname, verinfo);
541 KASSERT(modname == NULL && verinfo == NULL,
542 ("linker_release_module: both file and name"));
543 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
549 linker_find_file_by_name(const char *filename)
554 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
555 sprintf(koname, "%s.ko", filename);
557 sx_assert(&kld_sx, SA_XLOCKED);
558 TAILQ_FOREACH(lf, &linker_files, link) {
559 if (strcmp(lf->filename, koname) == 0)
561 if (strcmp(lf->filename, filename) == 0)
564 free(koname, M_LINKER);
569 linker_find_file_by_id(int fileid)
573 sx_assert(&kld_sx, SA_XLOCKED);
574 TAILQ_FOREACH(lf, &linker_files, link)
575 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
581 linker_file_foreach(linker_predicate_t *predicate, void *context)
587 TAILQ_FOREACH(lf, &linker_files, link) {
588 retval = predicate(lf, context);
597 linker_make_file(const char *pathname, linker_class_t lc)
600 const char *filename;
603 sx_assert(&kld_sx, SA_XLOCKED);
604 filename = linker_basename(pathname);
606 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
607 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
613 lf->filename = strdup(filename, M_LINKER);
614 lf->pathname = strdup(pathname, M_LINKER);
615 LINKER_GET_NEXT_FILE_ID(lf->id);
618 lf->loadcnt = ++loadcnt;
619 STAILQ_INIT(&lf->common);
620 TAILQ_INIT(&lf->modules);
621 TAILQ_INSERT_TAIL(&linker_files, lf, link);
626 linker_file_unload(linker_file_t file, int flags)
629 modlist_t ml, nextml;
630 struct common_symbol *cp;
633 /* Refuse to unload modules if securelevel raised. */
634 if (prison0.pr_securelevel > 0)
637 sx_assert(&kld_sx, SA_XLOCKED);
638 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
640 /* Easy case of just dropping a reference. */
641 if (file->refs > 1) {
646 /* Give eventhandlers a chance to prevent the unload. */
648 EVENTHANDLER_INVOKE(kld_unload_try, file, &error);
652 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
653 " informing modules\n"));
656 * Quiesce all the modules to give them a chance to veto the unload.
659 for (mod = TAILQ_FIRST(&file->modules); mod;
660 mod = module_getfnext(mod)) {
662 error = module_quiesce(mod);
663 if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
664 KLD_DPF(FILE, ("linker_file_unload: module %s"
665 " vetoed unload\n", module_getname(mod)));
667 * XXX: Do we need to tell all the quiesced modules
668 * that they can resume work now via a new module
678 * Inform any modules associated with this file that they are
682 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
683 next = module_getfnext(mod);
687 * Give the module a chance to veto the unload.
689 if ((error = module_unload(mod)) != 0) {
692 KLD_DPF(FILE, ("linker_file_unload: module %s"
693 " failed unload\n", module_getname(mod)));
703 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
704 if (ml->container == file) {
705 TAILQ_REMOVE(&found_modules, ml, link);
711 * Don't try to run SYSUNINITs if we are unloaded due to a
714 if (file->flags & LINKER_FILE_LINKED) {
715 file->flags &= ~LINKER_FILE_LINKED;
716 linker_file_unregister_sysctls(file);
717 linker_file_sysuninit(file);
719 TAILQ_REMOVE(&linker_files, file, link);
722 for (i = 0; i < file->ndeps; i++)
723 linker_file_unload(file->deps[i], flags);
724 free(file->deps, M_LINKER);
727 while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
728 STAILQ_REMOVE_HEAD(&file->common, link);
734 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,
737 if (file->filename) {
738 free(file->filename, M_LINKER);
739 file->filename = NULL;
741 if (file->pathname) {
742 free(file->pathname, M_LINKER);
743 file->pathname = NULL;
745 kobj_delete((kobj_t) file, M_LINKER);
750 linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
752 return (LINKER_CTF_GET(file, lc));
756 linker_file_add_dependency(linker_file_t file, linker_file_t dep)
758 linker_file_t *newdeps;
760 sx_assert(&kld_sx, SA_XLOCKED);
761 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
762 M_LINKER, M_WAITOK | M_ZERO);
763 file->deps[file->ndeps] = dep;
765 KLD_DPF(FILE, ("linker_file_add_dependency:"
766 " adding %s as dependency for %s\n",
767 dep->filename, file->filename));
772 * Locate a linker set and its contents. This is a helper function to avoid
773 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
774 * This function is used in this file so we can avoid having lots of (void **)
778 linker_file_lookup_set(linker_file_t file, const char *name,
779 void *firstp, void *lastp, int *countp)
782 sx_assert(&kld_sx, SA_LOCKED);
783 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
787 * List all functions in a file.
790 linker_file_function_listall(linker_file_t lf,
791 linker_function_nameval_callback_t callback_func, void *arg)
793 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
797 linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
802 locked = sx_xlocked(&kld_sx);
805 sym = linker_file_lookup_symbol_internal(file, name, deps);
812 linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
816 linker_symval_t symval;
818 size_t common_size = 0;
821 sx_assert(&kld_sx, SA_XLOCKED);
822 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
825 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
826 LINKER_SYMBOL_VALUES(file, sym, &symval);
827 if (symval.value == 0)
829 * For commons, first look them up in the
830 * dependencies and only allocate space if not found
833 common_size = symval.size;
835 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
836 ".value=%p\n", symval.value));
837 return (symval.value);
841 for (i = 0; i < file->ndeps; i++) {
842 address = linker_file_lookup_symbol_internal(
843 file->deps[i], name, 0);
845 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
846 " deps value=%p\n", address));
851 if (common_size > 0) {
853 * This is a common symbol which was not found in the
854 * dependencies. We maintain a simple common symbol table in
857 struct common_symbol *cp;
859 STAILQ_FOREACH(cp, &file->common, link) {
860 if (strcmp(cp->name, name) == 0) {
861 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
862 " old common value=%p\n", cp->address));
863 return (cp->address);
867 * Round the symbol size up to align.
869 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
870 cp = malloc(sizeof(struct common_symbol)
871 + common_size + strlen(name) + 1, M_LINKER,
873 cp->address = (caddr_t)(cp + 1);
874 cp->name = cp->address + common_size;
875 strcpy(cp->name, name);
876 bzero(cp->address, common_size);
877 STAILQ_INSERT_TAIL(&file->common, cp, link);
879 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
880 " value=%p\n", cp->address));
881 return (cp->address);
883 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
888 * Both DDB and stack(9) rely on the kernel linker to provide forward and
889 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
890 * do this in a lockfree manner. We provide a set of internal helper
891 * routines to perform these operations without locks, and then wrappers that
894 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
898 linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
902 TAILQ_FOREACH(lf, &linker_files, link) {
903 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
911 linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
914 c_linker_sym_t best, es;
915 u_long diff, bestdiff, off;
918 off = (uintptr_t)value;
920 TAILQ_FOREACH(lf, &linker_files, link) {
921 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
923 if (es != 0 && diff < bestdiff) {
942 linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
946 TAILQ_FOREACH(lf, &linker_files, link) {
947 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
954 linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
957 linker_symval_t symval;
962 error = linker_debug_search_symbol(value, &sym, offset);
965 error = linker_debug_symbol_values(sym, &symval);
968 strlcpy(buf, symval.name, buflen);
973 * DDB Helpers. DDB has to look across multiple files with their own symbol
974 * tables and string tables.
976 * Note that we do not obey list locking protocols here. We really don't need
977 * DDB to hang because somebody's got the lock held. We'll take the chance
978 * that the files list is inconsistent instead.
982 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
985 return (linker_debug_lookup(symstr, sym));
990 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
993 return (linker_debug_search_symbol(value, sym, diffp));
997 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
1000 return (linker_debug_symbol_values(sym, symval));
1004 linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1008 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
1012 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
1013 * obey locking protocols, and offer a significantly less complex interface.
1016 linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
1022 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1023 sx_xunlock(&kld_sx);
1031 kern_kldload(struct thread *td, const char *file, int *fileid)
1033 const char *kldname, *modname;
1037 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1040 if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
1044 * It is possible that kldloaded module will attach a new ifnet,
1045 * so vnet context must be set when this ocurs.
1047 CURVNET_SET(TD_TO_VNET(td));
1050 * If file does not contain a qualified name or any dot in it
1051 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1054 if (strchr(file, '/') || strchr(file, '.')) {
1063 error = linker_load_module(kldname, modname, NULL, NULL, &lf);
1065 sx_xunlock(&kld_sx);
1071 sx_xunlock(&kld_sx);
1079 sys_kldload(struct thread *td, struct kldload_args *uap)
1081 char *pathname = NULL;
1084 td->td_retval[0] = -1;
1086 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1087 error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
1089 error = kern_kldload(td, pathname, &fileid);
1091 td->td_retval[0] = fileid;
1093 free(pathname, M_TEMP);
1098 kern_kldunload(struct thread *td, int fileid, int flags)
1103 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1106 if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
1109 CURVNET_SET(TD_TO_VNET(td));
1111 lf = linker_find_file_by_id(fileid);
1113 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1115 if (lf->userrefs == 0) {
1117 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1119 printf("kldunload: attempt to unload file that was"
1120 " loaded by the kernel\n");
1124 error = linker_file_unload(lf, flags);
1130 sx_xunlock(&kld_sx);
1137 sys_kldunload(struct thread *td, struct kldunload_args *uap)
1140 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
1144 sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1147 if (uap->flags != LINKER_UNLOAD_NORMAL &&
1148 uap->flags != LINKER_UNLOAD_FORCE)
1150 return (kern_kldunload(td, uap->fileid, uap->flags));
1154 sys_kldfind(struct thread *td, struct kldfind_args *uap)
1157 const char *filename;
1162 error = mac_kld_check_stat(td->td_ucred);
1167 td->td_retval[0] = -1;
1169 pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1170 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
1173 filename = linker_basename(pathname);
1175 lf = linker_find_file_by_name(filename);
1177 td->td_retval[0] = lf->id;
1180 sx_xunlock(&kld_sx);
1182 free(pathname, M_TEMP);
1187 sys_kldnext(struct thread *td, struct kldnext_args *uap)
1193 error = mac_kld_check_stat(td->td_ucred);
1199 if (uap->fileid == 0)
1200 lf = TAILQ_FIRST(&linker_files);
1202 lf = linker_find_file_by_id(uap->fileid);
1207 lf = TAILQ_NEXT(lf, link);
1210 /* Skip partially loaded files. */
1211 while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
1212 lf = TAILQ_NEXT(lf, link);
1215 td->td_retval[0] = lf->id;
1217 td->td_retval[0] = 0;
1219 sx_xunlock(&kld_sx);
1224 sys_kldstat(struct thread *td, struct kldstat_args *uap)
1226 struct kld_file_stat *stat;
1230 * Check the version of the user's structure.
1232 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1235 if (version != sizeof(struct kld_file_stat_1) &&
1236 version != sizeof(struct kld_file_stat))
1239 stat = malloc(sizeof(*stat), M_TEMP, M_WAITOK | M_ZERO);
1240 error = kern_kldstat(td, uap->fileid, stat);
1242 error = copyout(stat, uap->stat, version);
1248 kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1255 error = mac_kld_check_stat(td->td_ucred);
1261 lf = linker_find_file_by_id(fileid);
1263 sx_xunlock(&kld_sx);
1267 /* Version 1 fields: */
1268 namelen = strlen(lf->filename) + 1;
1269 if (namelen > MAXPATHLEN)
1270 namelen = MAXPATHLEN;
1271 bcopy(lf->filename, &stat->name[0], namelen);
1272 stat->refs = lf->refs;
1274 stat->address = lf->address;
1275 stat->size = lf->size;
1276 /* Version 2 fields: */
1277 namelen = strlen(lf->pathname) + 1;
1278 if (namelen > MAXPATHLEN)
1279 namelen = MAXPATHLEN;
1280 bcopy(lf->pathname, &stat->pathname[0], namelen);
1281 sx_xunlock(&kld_sx);
1283 td->td_retval[0] = 0;
1288 sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1295 error = mac_kld_check_stat(td->td_ucred);
1301 lf = linker_find_file_by_id(uap->fileid);
1304 mp = TAILQ_FIRST(&lf->modules);
1306 td->td_retval[0] = module_getid(mp);
1308 td->td_retval[0] = 0;
1312 sx_xunlock(&kld_sx);
1317 sys_kldsym(struct thread *td, struct kldsym_args *uap)
1319 char *symstr = NULL;
1321 linker_symval_t symval;
1323 struct kld_sym_lookup lookup;
1327 error = mac_kld_check_stat(td->td_ucred);
1332 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1334 if (lookup.version != sizeof(lookup) ||
1335 uap->cmd != KLDSYM_LOOKUP)
1337 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1338 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
1341 if (uap->fileid != 0) {
1342 lf = linker_find_file_by_id(uap->fileid);
1345 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1346 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1347 lookup.symvalue = (uintptr_t) symval.value;
1348 lookup.symsize = symval.size;
1349 error = copyout(&lookup, uap->data, sizeof(lookup));
1353 TAILQ_FOREACH(lf, &linker_files, link) {
1354 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1355 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1356 lookup.symvalue = (uintptr_t)symval.value;
1357 lookup.symsize = symval.size;
1358 error = copyout(&lookup, uap->data,
1366 sx_xunlock(&kld_sx);
1368 free(symstr, M_TEMP);
1373 * Preloaded module support
1377 modlist_lookup(const char *name, int ver)
1381 TAILQ_FOREACH(mod, &found_modules, link) {
1382 if (strcmp(mod->name, name) == 0 &&
1383 (ver == 0 || mod->version == ver))
1390 modlist_lookup2(const char *name, struct mod_depend *verinfo)
1392 modlist_t mod, bestmod;
1395 if (verinfo == NULL)
1396 return (modlist_lookup(name, 0));
1398 TAILQ_FOREACH(mod, &found_modules, link) {
1399 if (strcmp(mod->name, name) != 0)
1402 if (ver == verinfo->md_ver_preferred)
1404 if (ver >= verinfo->md_ver_minimum &&
1405 ver <= verinfo->md_ver_maximum &&
1406 (bestmod == NULL || ver > bestmod->version))
1413 modlist_newmodule(const char *modname, int version, linker_file_t container)
1417 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
1419 panic("no memory for module list");
1420 mod->container = container;
1421 mod->name = modname;
1422 mod->version = version;
1423 TAILQ_INSERT_TAIL(&found_modules, mod, link);
1428 linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1429 struct mod_metadata **stop, int preload)
1431 struct mod_metadata *mp, **mdp;
1432 const char *modname;
1435 for (mdp = start; mdp < stop; mdp++) {
1437 if (mp->md_type != MDT_VERSION)
1439 modname = mp->md_cval;
1440 ver = ((struct mod_version *)mp->md_data)->mv_version;
1441 if (modlist_lookup(modname, ver) != NULL) {
1442 printf("module %s already present!\n", modname);
1443 /* XXX what can we do? this is a build error. :-( */
1446 modlist_newmodule(modname, ver, lf);
1451 linker_preload(void *arg)
1454 const char *modname, *nmodname;
1456 linker_file_t lf, nlf;
1459 linker_file_list_t loaded_files;
1460 linker_file_list_t depended_files;
1461 struct mod_metadata *mp, *nmp;
1462 struct mod_metadata **start, **stop, **mdp, **nmdp;
1463 struct mod_depend *verinfo;
1467 struct sysinit **si_start, **si_stop;
1469 TAILQ_INIT(&loaded_files);
1470 TAILQ_INIT(&depended_files);
1471 TAILQ_INIT(&found_modules);
1476 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1477 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1478 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1479 if (modname == NULL) {
1480 printf("Preloaded module at %p does not have a"
1481 " name!\n", modptr);
1484 if (modtype == NULL) {
1485 printf("Preloaded module at %p does not have a type!\n",
1490 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1493 TAILQ_FOREACH(lc, &classes, link) {
1494 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1500 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
1504 * First get a list of stuff in the kernel.
1506 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
1508 linker_addmodules(linker_kernel_file, start, stop, 1);
1511 * This is a once-off kinky bubble sort to resolve relocation
1512 * dependency requirements.
1515 TAILQ_FOREACH(lf, &loaded_files, loaded) {
1516 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1519 * First, look to see if we would successfully link with this
1522 resolves = 1; /* unless we know otherwise */
1524 for (mdp = start; mdp < stop; mdp++) {
1526 if (mp->md_type != MDT_DEPEND)
1528 modname = mp->md_cval;
1529 verinfo = mp->md_data;
1530 for (nmdp = start; nmdp < stop; nmdp++) {
1532 if (nmp->md_type != MDT_VERSION)
1534 nmodname = nmp->md_cval;
1535 if (strcmp(modname, nmodname) == 0)
1538 if (nmdp < stop) /* it's a self reference */
1542 * ok, the module isn't here yet, we
1545 if (modlist_lookup2(modname, verinfo) == NULL)
1550 * OK, if we found our modules, we can link. So, "provide"
1551 * the modules inside and add it to the end of the link order
1556 for (mdp = start; mdp < stop; mdp++) {
1558 if (mp->md_type != MDT_VERSION)
1560 modname = mp->md_cval;
1561 nver = ((struct mod_version *)
1562 mp->md_data)->mv_version;
1563 if (modlist_lookup(modname,
1565 printf("module %s already"
1566 " present!\n", modname);
1567 TAILQ_REMOVE(&loaded_files,
1569 linker_file_unload(lf,
1570 LINKER_UNLOAD_FORCE);
1571 /* we changed tailq next ptr */
1574 modlist_newmodule(modname, nver, lf);
1577 TAILQ_REMOVE(&loaded_files, lf, loaded);
1578 TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
1580 * Since we provided modules, we need to restart the
1581 * sort so that the previous files that depend on us
1582 * have a chance. Also, we've busted the tailq next
1583 * pointer with the REMOVE.
1590 * At this point, we check to see what could not be resolved..
1592 while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
1593 TAILQ_REMOVE(&loaded_files, lf, loaded);
1594 printf("KLD file %s is missing dependencies\n", lf->filename);
1595 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1599 * We made it. Finish off the linking in the order we determined.
1601 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
1602 if (linker_kernel_file) {
1603 linker_kernel_file->refs++;
1604 error = linker_file_add_dependency(lf,
1605 linker_kernel_file);
1607 panic("cannot add dependency");
1609 lf->userrefs++; /* so we can (try to) kldunload it */
1610 error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
1613 for (mdp = start; mdp < stop; mdp++) {
1615 if (mp->md_type != MDT_DEPEND)
1617 modname = mp->md_cval;
1618 verinfo = mp->md_data;
1619 mod = modlist_lookup2(modname, verinfo);
1621 printf("KLD file %s - cannot find "
1622 "dependency \"%s\"\n",
1623 lf->filename, modname);
1626 /* Don't count self-dependencies */
1627 if (lf == mod->container)
1629 mod->container->refs++;
1630 error = linker_file_add_dependency(lf,
1633 panic("cannot add dependency");
1637 * Now do relocation etc using the symbol search paths
1638 * established by the dependencies
1640 error = LINKER_LINK_PRELOAD_FINISH(lf);
1642 printf("KLD file %s - could not finalize loading\n",
1646 linker_file_register_modules(lf);
1647 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1648 &si_stop, NULL) == 0)
1649 sysinit_add(si_start, si_stop);
1650 linker_file_register_sysctls(lf, true);
1651 lf->flags |= LINKER_FILE_LINKED;
1654 TAILQ_REMOVE(&depended_files, lf, loaded);
1655 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1657 sx_xunlock(&kld_sx);
1658 /* woohoo! we made it! */
1661 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1664 * Search for a not-loaded module by name.
1666 * Modules may be found in the following locations:
1668 * - preloaded (result is just the module name) - on disk (result is full path
1671 * If the module name is qualified in any way (contains path, etc.) the we
1672 * simply return a copy of it.
1674 * The search path can be manipulated via sysctl. Note that we use the ';'
1675 * character as a separator to be consistent with the bootloader.
1678 static char linker_hintfile[] = "linker.hints";
1679 static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
1681 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1682 sizeof(linker_path), "module load search path");
1684 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1686 static char *linker_ext_list[] = {
1693 * Check if file actually exists either with or without extension listed in
1694 * the linker_ext_list. (probably should be generic for the rest of the
1698 linker_lookup_file(const char *path, int pathlen, const char *name,
1699 int namelen, struct vattr *vap)
1701 struct nameidata nd;
1702 struct thread *td = curthread; /* XXX */
1703 char *result, **cpp, *sep;
1704 int error, len, extlen, reclen, flags;
1708 for (cpp = linker_ext_list; *cpp; cpp++) {
1713 extlen++; /* trailing '\0' */
1714 sep = (path[pathlen - 1] != '/') ? "/" : "";
1716 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1717 result = malloc(reclen, M_LINKER, M_WAITOK);
1718 for (cpp = linker_ext_list; *cpp; cpp++) {
1719 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1720 namelen, name, *cpp);
1722 * Attempt to open the file, and return the path if
1723 * we succeed and it's a regular file.
1725 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1727 error = vn_open(&nd, &flags, 0, NULL);
1729 NDFREE(&nd, NDF_ONLY_PNBUF);
1730 type = nd.ni_vp->v_type;
1732 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1733 VOP_UNLOCK(nd.ni_vp, 0);
1734 vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
1739 free(result, M_LINKER);
1743 #define INT_ALIGN(base, ptr) ptr = \
1744 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
1747 * Lookup KLD which contains requested module in the "linker.hints" file. If
1748 * version specification is available, then try to find the best KLD.
1749 * Otherwise just find the latest one.
1752 linker_hints_lookup(const char *path, int pathlen, const char *modname,
1753 int modnamelen, struct mod_depend *verinfo)
1755 struct thread *td = curthread; /* XXX */
1756 struct ucred *cred = td ? td->td_ucred : NULL;
1757 struct nameidata nd;
1758 struct vattr vattr, mattr;
1759 u_char *hints = NULL;
1760 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1761 int error, ival, bestver, *intp, found, flags, clen, blen;
1765 bestver = found = 0;
1767 sep = (path[pathlen - 1] != '/') ? "/" : "";
1768 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1770 pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
1771 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1774 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
1776 error = vn_open(&nd, &flags, 0, NULL);
1779 NDFREE(&nd, NDF_ONLY_PNBUF);
1780 if (nd.ni_vp->v_type != VREG)
1783 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1787 * XXX: we need to limit this number to some reasonable value
1789 if (vattr.va_size > 100 * 1024) {
1790 printf("hints file too large %ld\n", (long)vattr.va_size);
1793 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
1794 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1795 UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
1798 VOP_UNLOCK(nd.ni_vp, 0);
1799 vn_close(nd.ni_vp, FREAD, cred, td);
1802 printf("can't read %zd\n", reclen);
1805 intp = (int *)hints;
1807 if (ival != LINKER_HINTS_VERSION) {
1808 printf("hints file version mismatch %d\n", ival);
1811 bufend = hints + vattr.va_size;
1812 recptr = (u_char *)intp;
1814 while (recptr < bufend && !found) {
1815 intp = (int *)recptr;
1822 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1825 INT_ALIGN(hints, cp);
1829 if (verinfo == NULL ||
1830 ival == verinfo->md_ver_preferred) {
1834 if (ival >= verinfo->md_ver_minimum &&
1835 ival <= verinfo->md_ver_maximum &&
1845 recptr += reclen + sizeof(int);
1848 * Finally check if KLD is in the place
1851 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1853 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1856 * KLD is newer than hints file. What we should do now?
1858 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
1859 printf("warning: KLD '%s' is newer than the linker.hints"
1862 free(pathbuf, M_LINKER);
1864 free(hints, M_TEMP);
1865 if (nd.ni_vp != NULL) {
1866 VOP_UNLOCK(nd.ni_vp, 0);
1867 vn_close(nd.ni_vp, FREAD, cred, td);
1870 * If nothing found or hints is absent - fallback to the old
1871 * way by using "kldname[.ko]" as module name.
1873 if (!found && !bestver && result == NULL)
1874 result = linker_lookup_file(path, pathlen, modname,
1880 * Lookup KLD which contains requested module in the all directories.
1883 linker_search_module(const char *modname, int modnamelen,
1884 struct mod_depend *verinfo)
1886 char *cp, *ep, *result;
1889 * traverse the linker path
1891 for (cp = linker_path; *cp; cp = ep + 1) {
1892 /* find the end of this component */
1893 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1894 result = linker_hints_lookup(cp, ep - cp, modname,
1895 modnamelen, verinfo);
1905 * Search for module in all directories listed in the linker_path.
1908 linker_search_kld(const char *name)
1910 char *cp, *ep, *result;
1913 /* qualified at all? */
1914 if (strchr(name, '/'))
1915 return (strdup(name, M_LINKER));
1917 /* traverse the linker path */
1919 for (ep = linker_path; *ep; ep++) {
1921 /* find the end of this component */
1922 for (; *ep != 0 && *ep != ';'; ep++);
1923 result = linker_lookup_file(cp, ep - cp, name, len, NULL);
1931 linker_basename(const char *path)
1933 const char *filename;
1935 filename = strrchr(path, '/');
1936 if (filename == NULL)
1945 * Inform hwpmc about the set of kernel modules currently loaded.
1948 linker_hwpmc_list_objects(void)
1951 struct pmckern_map_in *kobase;
1956 TAILQ_FOREACH(lf, &linker_files, link)
1959 /* Allocate nmappings + 1 entries. */
1960 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1961 M_LINKER, M_WAITOK | M_ZERO);
1963 TAILQ_FOREACH(lf, &linker_files, link) {
1965 /* Save the info for this linker file. */
1966 kobase[i].pm_file = lf->filename;
1967 kobase[i].pm_address = (uintptr_t)lf->address;
1970 sx_sunlock(&kld_sx);
1972 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
1974 /* The last entry of the malloced area comprises of all zeros. */
1975 KASSERT(kobase[i].pm_file == NULL,
1976 ("linker_hwpmc_list_objects: last object not NULL"));
1978 return ((void *)kobase);
1983 * Find a file which contains given module and load it, if "parent" is not
1984 * NULL, register a reference to it.
1987 linker_load_module(const char *kldname, const char *modname,
1988 struct linker_file *parent, struct mod_depend *verinfo,
1989 struct linker_file **lfpp)
1991 linker_file_t lfdep;
1992 const char *filename;
1996 sx_assert(&kld_sx, SA_XLOCKED);
1997 if (modname == NULL) {
1999 * We have to load KLD
2001 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
2003 pathname = linker_search_kld(kldname);
2005 if (modlist_lookup2(modname, verinfo) != NULL)
2007 if (kldname != NULL)
2008 pathname = strdup(kldname, M_LINKER);
2009 else if (rootvnode == NULL)
2013 * Need to find a KLD with required module
2015 pathname = linker_search_module(modname,
2016 strlen(modname), verinfo);
2018 if (pathname == NULL)
2022 * Can't load more than one file with the same basename XXX:
2023 * Actually it should be possible to have multiple KLDs with
2024 * the same basename but different path because they can
2025 * provide different versions of the same modules.
2027 filename = linker_basename(pathname);
2028 if (linker_find_file_by_name(filename))
2031 error = linker_load_file(pathname, &lfdep);
2034 if (modname && verinfo &&
2035 modlist_lookup2(modname, verinfo) == NULL) {
2036 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
2041 error = linker_file_add_dependency(parent, lfdep);
2048 free(pathname, M_LINKER);
2053 * This routine is responsible for finding dependencies of userland initiated
2054 * kldload(2)'s of files.
2057 linker_load_dependencies(linker_file_t lf)
2059 linker_file_t lfdep;
2060 struct mod_metadata **start, **stop, **mdp, **nmdp;
2061 struct mod_metadata *mp, *nmp;
2062 struct mod_depend *verinfo;
2064 const char *modname, *nmodname;
2065 int ver, error = 0, count;
2068 * All files are dependent on /kernel.
2070 sx_assert(&kld_sx, SA_XLOCKED);
2071 if (linker_kernel_file) {
2072 linker_kernel_file->refs++;
2073 error = linker_file_add_dependency(lf, linker_kernel_file);
2077 if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
2080 for (mdp = start; mdp < stop; mdp++) {
2082 if (mp->md_type != MDT_VERSION)
2084 modname = mp->md_cval;
2085 ver = ((struct mod_version *)mp->md_data)->mv_version;
2086 mod = modlist_lookup(modname, ver);
2088 printf("interface %s.%d already present in the KLD"
2089 " '%s'!\n", modname, ver,
2090 mod->container->filename);
2095 for (mdp = start; mdp < stop; mdp++) {
2097 if (mp->md_type != MDT_DEPEND)
2099 modname = mp->md_cval;
2100 verinfo = mp->md_data;
2102 for (nmdp = start; nmdp < stop; nmdp++) {
2104 if (nmp->md_type != MDT_VERSION)
2106 nmodname = nmp->md_cval;
2107 if (strcmp(modname, nmodname) == 0)
2110 if (nmdp < stop)/* early exit, it's a self reference */
2112 mod = modlist_lookup2(modname, verinfo);
2113 if (mod) { /* woohoo, it's loaded already */
2114 lfdep = mod->container;
2116 error = linker_file_add_dependency(lf, lfdep);
2121 error = linker_load_module(NULL, modname, lf, verinfo, NULL);
2123 printf("KLD %s: depends on %s - not available or"
2124 " version mismatch\n", lf->filename, modname);
2131 linker_addmodules(lf, start, stop, 0);
2136 sysctl_kern_function_list_iterate(const char *name, void *opaque)
2138 struct sysctl_req *req;
2141 return (SYSCTL_OUT(req, name, strlen(name) + 1));
2145 * Export a nul-separated, double-nul-terminated list of all function names
2149 sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
2155 error = mac_kld_check_stat(req->td->td_ucred);
2159 error = sysctl_wire_old_buffer(req, 0);
2163 TAILQ_FOREACH(lf, &linker_files, link) {
2164 error = LINKER_EACH_FUNCTION_NAME(lf,
2165 sysctl_kern_function_list_iterate, req);
2167 sx_xunlock(&kld_sx);
2171 sx_xunlock(&kld_sx);
2172 return (SYSCTL_OUT(req, "", 1));
2175 SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,
2176 NULL, 0, sysctl_kern_function_list, "", "kernel function list");