2 * Copyright (c) 1997 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
26 * $FreeBSD: src/sys/kern/kern_linker.c,v 1.41.2.3 2001/11/21 17:50:35 luigi Exp $
27 * $DragonFly: src/sys/kern/kern_linker.c,v 1.9 2003/07/26 18:12:44 dillon Exp $
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/sysproto.h>
37 #include <sys/sysent.h>
40 #include <sys/module.h>
41 #include <sys/linker.h>
42 #include <sys/fcntl.h>
43 #include <sys/libkern.h>
44 #include <sys/namei.h>
45 #include <sys/vnode.h>
46 #include <sys/sysctl.h>
48 #include <vm/vm_zone.h>
54 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker");
55 linker_file_t linker_current_file;
56 linker_file_t linker_kernel_file;
58 static struct lock lock; /* lock for the file list */
59 static linker_class_list_t classes;
60 static linker_file_list_t linker_files;
61 static int next_file_id = 1;
64 linker_init(void* arg)
66 lockinit(&lock, 0, "klink", 0, 0);
68 TAILQ_INIT(&linker_files);
71 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
74 linker_add_class(const char* desc, void* priv,
75 struct linker_class_ops* ops)
79 lc = malloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT);
82 bzero(lc, sizeof(*lc));
87 TAILQ_INSERT_HEAD(&classes, lc, link);
93 linker_file_sysinit(linker_file_t lf)
95 struct linker_set* sysinits;
96 struct sysinit** sipp;
97 struct sysinit** xipp;
99 const moduledata_t *moddata;
102 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
105 if (linker_file_lookup_symbol(lf, "sysinit_set", 0, (caddr_t *)&sysinits)) {
106 KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs not found\n"));
107 return 0; /* XXX is this correct ? No sysinit ? */
109 KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs %p\n", sysinits));
110 if (sysinits == NULL)
111 return 0; /* XXX is this correct ? No sysinit ? */
114 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
115 if ((*sipp)->func == module_register_init) {
116 moddata = (*sipp)->udata;
117 error = module_register(moddata, lf);
119 printf("linker_file_sysinit \"%s\" failed to register! %d\n",
120 lf->filename, error);
127 * Perform a bubble sort of the system initialization objects by
128 * their subsystem (primary key) and order (secondary key).
130 * Since some things care about execution order, this is the
131 * operation which ensures continued function.
133 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
134 for (xipp = sipp + 1; *xipp; xipp++) {
135 if ((*sipp)->subsystem < (*xipp)->subsystem ||
136 ((*sipp)->subsystem == (*xipp)->subsystem &&
137 (*sipp)->order <= (*xipp)->order))
147 * Traverse the (now) ordered list of system initialization tasks.
148 * Perform each task, and continue on to the next task.
150 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
151 if ((*sipp)->subsystem == SI_SUB_DUMMY)
152 continue; /* skip dummy task(s)*/
155 (*((*sipp)->func))((*sipp)->udata);
157 return 0; /* no errors */
161 linker_file_sysuninit(linker_file_t lf)
163 struct linker_set* sysuninits;
164 struct sysinit** sipp;
165 struct sysinit** xipp;
166 struct sysinit* save;
168 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
171 if (linker_file_lookup_symbol(lf, "sysuninit_set", 0, (caddr_t *)&sysuninits)) {
172 KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs not found\n"));
175 KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs %p\n", sysuninits));
176 if (sysuninits == NULL)
180 * Perform a reverse bubble sort of the system initialization objects
181 * by their subsystem (primary key) and order (secondary key).
183 * Since some things care about execution order, this is the
184 * operation which ensures continued function.
186 for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) {
187 for (xipp = sipp + 1; *xipp; xipp++) {
188 if ((*sipp)->subsystem > (*xipp)->subsystem ||
189 ((*sipp)->subsystem == (*xipp)->subsystem &&
190 (*sipp)->order >= (*xipp)->order))
200 * Traverse the (now) ordered list of system initialization tasks.
201 * Perform each task, and continue on to the next task.
203 for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) {
204 if ((*sipp)->subsystem == SI_SUB_DUMMY)
205 continue; /* skip dummy task(s)*/
208 (*((*sipp)->func))((*sipp)->udata);
213 linker_file_register_sysctls(linker_file_t lf)
215 struct linker_set* sysctls;
217 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
220 if (linker_file_lookup_symbol(lf, "sysctl_set", 0, (caddr_t *)&sysctls)) {
221 KLD_DPF(FILE, ("linker_file_register_sysctls: SYSCTLs not found\n"));
224 KLD_DPF(FILE, ("linker_file_register_sysctls: SYSCTLs %p\n", sysctls));
228 sysctl_register_set(sysctls);
232 linker_file_unregister_sysctls(linker_file_t lf)
234 struct linker_set* sysctls;
236 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n",
239 if (linker_file_lookup_symbol(lf, "sysctl_set", 0, (caddr_t *)&sysctls)) {
240 KLD_DPF(FILE, ("linker_file_unregister_sysctls: SYSCTLs not found\n"));
243 KLD_DPF(FILE, ("linker_file_unregister_sysctls: SYSCTLs %p\n", sysctls));
247 sysctl_unregister_set(sysctls);
251 linker_load_file(const char* filename, linker_file_t* result)
255 int foundfile, error = 0;
258 /* Refuse to load modules if securelevel raised */
262 lf = linker_find_file_by_name(filename);
264 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
270 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
271 if (koname == NULL) {
275 sprintf(koname, "%s.ko", filename);
278 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
279 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
280 filename, lc->desc));
282 error = lc->ops->load_file(koname, &lf); /* First with .ko */
283 if (lf == NULL && error == ENOENT)
284 error = lc->ops->load_file(filename, &lf); /* Then try without */
286 * If we got something other than ENOENT, then it exists but we cannot
287 * load it for some other reason.
292 linker_file_register_sysctls(lf);
293 error = linker_file_sysinit(lf);
300 * Less than ideal, but tells the user whether it failed to load or
301 * the module was not found.
304 error = ENOEXEC; /* Format not recognised (or unloadable) */
306 error = ENOENT; /* Nothing found */
310 free(koname, M_LINKER);
315 linker_find_file_by_name(const char* filename)
317 linker_file_t lf = 0;
320 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
323 sprintf(koname, "%s.ko", filename);
325 lockmgr(&lock, LK_SHARED, 0, curthread);
326 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
327 if (!strcmp(lf->filename, koname))
329 if (!strcmp(lf->filename, filename))
332 lockmgr(&lock, LK_RELEASE, 0, curthread);
336 free(koname, M_LINKER);
341 linker_find_file_by_id(int fileid)
343 linker_file_t lf = 0;
345 lockmgr(&lock, LK_SHARED, 0, curthread);
346 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link))
347 if (lf->id == fileid)
349 lockmgr(&lock, LK_RELEASE, 0, curthread);
355 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
357 linker_file_t lf = 0;
359 const char *filename;
361 filename = rindex(pathname, '/');
362 if (filename && filename[1])
367 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
368 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
369 namelen = strlen(filename) + 1;
370 lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
373 bzero(lf, sizeof(*lf));
378 lf->filename = (char*) (lf + 1);
379 strcpy(lf->filename, filename);
380 lf->id = next_file_id++;
383 STAILQ_INIT(&lf->common);
384 TAILQ_INIT(&lf->modules);
388 TAILQ_INSERT_TAIL(&linker_files, lf, link);
391 lockmgr(&lock, LK_RELEASE, 0, curthread);
396 linker_file_unload(linker_file_t file)
399 struct common_symbol* cp;
403 /* Refuse to unload modules if securelevel raised */
407 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
408 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
409 if (file->refs == 1) {
410 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
412 * Inform any modules associated with this file.
414 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
415 next = module_getfnext(mod);
418 * Give the module a chance to veto the unload.
420 if ((error = module_unload(mod)) != 0) {
421 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
423 lockmgr(&lock, LK_RELEASE, 0, curthread);
432 if (file->refs > 0) {
433 lockmgr(&lock, LK_RELEASE, 0, curthread);
437 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
438 if (file->flags & LINKER_FILE_LINKED) {
439 linker_file_sysuninit(file);
440 linker_file_unregister_sysctls(file);
443 TAILQ_REMOVE(&linker_files, file, link);
444 lockmgr(&lock, LK_RELEASE, 0, curthread);
446 for (i = 0; i < file->ndeps; i++)
447 linker_file_unload(file->deps[i]);
448 free(file->deps, M_LINKER);
450 for (cp = STAILQ_FIRST(&file->common); cp;
451 cp = STAILQ_FIRST(&file->common)) {
452 STAILQ_REMOVE(&file->common, cp, common_symbol, link);
456 file->ops->unload(file);
457 free(file, M_LINKER);
464 linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
466 linker_file_t* newdeps;
468 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*),
472 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*));
475 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
476 free(file->deps, M_LINKER);
478 file->deps = newdeps;
479 file->deps[file->ndeps] = dep;
486 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr)
489 linker_symval_t symval;
491 size_t common_size = 0;
494 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
497 if (file->ops->lookup_symbol(file, name, &sym) == 0) {
498 file->ops->symbol_values(file, sym, &symval);
501 * XXX Assume a common symbol if its value is 0 and it has a non-zero
502 * size, otherwise it could be an absolute symbol with a value of 0.
504 if (symval.value == 0 && symval.size != 0) {
506 * For commons, first look them up in the dependancies and
507 * only allocate space if not found there.
509 common_size = symval.size;
511 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
512 *raddr = symval.value;
517 for (i = 0; i < file->ndeps; i++) {
518 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) {
519 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", *raddr));
524 /* If we have not found it in the dependencies, search globally */
525 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
526 /* But skip the current file if it's on the list */
529 /* And skip the files we searched above */
530 for (i = 0; i < file->ndeps; i++)
531 if (lf == file->deps[i])
535 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) {
536 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", *raddr));
542 if (common_size > 0) {
544 * This is a common symbol which was not found in the
545 * dependancies. We maintain a simple common symbol table in
548 struct common_symbol* cp;
550 for (cp = STAILQ_FIRST(&file->common); cp;
551 cp = STAILQ_NEXT(cp, link))
552 if (!strcmp(cp->name, name)) {
553 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
554 *raddr = cp->address;
559 * Round the symbol size up to align.
561 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
562 cp = malloc(sizeof(struct common_symbol)
567 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
570 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
572 cp->address = (caddr_t) (cp + 1);
573 cp->name = cp->address + common_size;
574 strcpy(cp->name, name);
575 bzero(cp->address, common_size);
576 STAILQ_INSERT_TAIL(&file->common, cp, link);
578 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
579 *raddr = cp->address;
583 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
589 * DDB Helpers. DDB has to look across multiple files with their own
590 * symbol tables and string tables.
592 * Note that we do not obey list locking protocols here. We really don't
593 * need DDB to hang because somebody's got the lock held. We'll take the
594 * chance that the files list is inconsistant instead.
598 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
602 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
603 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0)
610 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
613 u_long off = (uintptr_t)value;
614 u_long diff, bestdiff;
620 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
621 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0)
623 if (es != 0 && diff < bestdiff) {
642 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
646 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
647 if (lf->ops->symbol_values(lf, sym, symval) == 0)
660 kldload(struct kldload_args *uap)
662 struct thread *td = curthread;
663 char* filename = NULL, *modulename;
667 uap->lmsg.u.ms_result = -1;
669 if (securelevel > 0) /* redundant, but that's OK */
672 if ((error = suser(td)) != 0)
675 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
676 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
679 /* Can't load more than one module with the same name */
680 modulename = rindex(filename, '/');
681 if (modulename == NULL)
682 modulename = filename;
685 if (linker_find_file_by_name(modulename)) {
690 if ((error = linker_load_file(filename, &lf)) != 0)
694 uap->lmsg.u.ms_result = lf->id;
698 free(filename, M_TEMP);
703 kldunload(struct kldunload_args *uap)
705 struct thread *td = curthread;
709 if (securelevel > 0) /* redundant, but that's OK */
712 if ((error = suser(td)) != 0)
715 lf = linker_find_file_by_id(SCARG(uap, fileid));
717 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
718 if (lf->userrefs == 0) {
719 printf("linkerunload: attempt to unload file that was loaded by the kernel\n");
724 error = linker_file_unload(lf);
735 kldfind(struct kldfind_args *uap)
737 char *filename = NULL, *modulename;
741 uap->lmsg.u.ms_result = -1;
743 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
744 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
747 modulename = rindex(filename, '/');
748 if (modulename == NULL)
749 modulename = filename;
751 lf = linker_find_file_by_name(modulename);
753 uap->lmsg.u.ms_result = lf->id;
759 free(filename, M_TEMP);
764 kldnext(struct kldnext_args *uap)
769 if (SCARG(uap, fileid) == 0) {
770 if (TAILQ_FIRST(&linker_files))
771 uap->lmsg.u.ms_result = TAILQ_FIRST(&linker_files)->id;
773 uap->lmsg.u.ms_result = 0;
777 lf = linker_find_file_by_id(SCARG(uap, fileid));
779 if (TAILQ_NEXT(lf, link))
780 uap->lmsg.u.ms_result = TAILQ_NEXT(lf, link)->id;
782 uap->lmsg.u.ms_result = 0;
790 kldstat(struct kldstat_args *uap)
795 struct kld_file_stat* stat;
798 lf = linker_find_file_by_id(SCARG(uap, fileid));
804 stat = SCARG(uap, stat);
807 * Check the version of the user's structure.
809 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
811 if (version != sizeof(struct kld_file_stat)) {
816 namelen = strlen(lf->filename) + 1;
817 if (namelen > MAXPATHLEN)
818 namelen = MAXPATHLEN;
819 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
821 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
823 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
825 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0)
827 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
830 uap->lmsg.u.ms_result = 0;
837 kldfirstmod(struct kldfirstmod_args *uap)
842 lf = linker_find_file_by_id(SCARG(uap, fileid));
844 if (TAILQ_FIRST(&lf->modules))
845 uap->lmsg.u.ms_result = module_getid(TAILQ_FIRST(&lf->modules));
847 uap->lmsg.u.ms_result = 0;
855 kldsym(struct kldsym_args *uap)
859 linker_symval_t symval;
861 struct kld_sym_lookup lookup;
864 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0)
866 if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) {
871 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
872 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
875 if (SCARG(uap, fileid) != 0) {
876 lf = linker_find_file_by_id(SCARG(uap, fileid));
881 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
882 lf->ops->symbol_values(lf, sym, &symval) == 0) {
883 lookup.symvalue = (uintptr_t)symval.value;
884 lookup.symsize = symval.size;
885 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
889 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
890 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
891 lf->ops->symbol_values(lf, sym, &symval) == 0) {
892 lookup.symvalue = (uintptr_t)symval.value;
893 lookup.symsize = symval.size;
894 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
903 free(symstr, M_TEMP);
908 * Preloaded module support
912 linker_preload(void* arg)
920 struct linker_set *sysinits;
921 struct sysinit **sipp;
922 const moduledata_t *moddata;
925 while ((modptr = preload_search_next_name(modptr)) != NULL) {
926 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
927 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
928 if (modname == NULL) {
929 printf("Preloaded module at %p does not have a name!\n", modptr);
932 if (modtype == NULL) {
933 printf("Preloaded module at %p does not have a type!\n", modptr);
936 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr);
937 lf = linker_find_file_by_name(modname);
943 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
944 error = lc->ops->load_file(modname, &lf);
953 if (linker_file_lookup_symbol(lf, "sysinit_set", 0, (caddr_t *)&sysinits) == 0 && sysinits) {
955 * This is to set the sysinit moduledata so that the module
956 * can attach itself to the correct containing file.
957 * The sysinit could be run at *any* time.
959 for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
960 if ((*sipp)->func == module_register_init) {
961 moddata = (*sipp)->udata;
962 error = module_register(moddata, lf);
964 printf("Preloaded %s \"%s\" failed to register: %d\n",
965 modtype, modname, error);
968 sysinit_add((struct sysinit **)sysinits->ls_items);
970 linker_file_register_sysctls(lf);
975 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
978 * Search for a not-loaded module by name.
980 * Modules may be found in the following locations:
982 * - preloaded (result is just the module name)
983 * - on disk (result is full path to module)
985 * If the module name is qualified in any way (contains path, etc.)
986 * the we simply return a copy of it.
988 * The search path can be manipulated via sysctl. Note that we use the ';'
989 * character as a separator to be consistent with the bootloader.
992 static char linker_path[MAXPATHLEN] = "/;/boot/;/modules/";
994 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
995 sizeof(linker_path), "module load search path");
998 linker_strdup(const char *str)
1002 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
1003 strcpy(result, str);
1008 linker_search_path(const char *name)
1010 struct nameidata nd;
1011 struct thread *td = curthread;
1012 char *cp, *ep, *result;
1016 /* qualified at all? */
1017 if (index(name, '/'))
1018 return(linker_strdup(name));
1020 /* traverse the linker path */
1024 /* find the end of this component */
1025 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++)
1027 result = malloc((strlen(name) + (ep - cp) + 1), M_LINKER, M_WAITOK);
1028 if (result == NULL) /* actually ENOMEM */
1031 strncpy(result, cp, ep - cp);
1032 strcpy(result + (ep - cp), name);
1035 * Attempt to open the file, and return the path if we succeed and it's
1038 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td);
1039 error = vn_open(&nd, FREAD, 0);
1041 NDFREE(&nd, NDF_ONLY_PNBUF);
1042 type = nd.ni_vp->v_type;
1043 VOP_UNLOCK(nd.ni_vp, 0, td);
1044 vn_close(nd.ni_vp, FREAD, td);
1048 free(result, M_LINKER);