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 1.14 2003/11/14 00:37:22 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 /* Metadata from the static kernel */
55 SET_DECLARE(modmetadata_set, struct mod_metadata);
56 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker");
58 linker_file_t linker_current_file;
59 linker_file_t linker_kernel_file;
61 static struct lock lock; /* lock for the file list */
62 static linker_class_list_t classes;
63 static linker_file_list_t linker_files;
64 static int next_file_id = 1;
67 linker_init(void* arg)
69 lockinit(&lock, 0, "klink", 0, 0);
71 TAILQ_INIT(&linker_files);
74 SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
77 linker_add_class(const char* desc, void* priv,
78 struct linker_class_ops* ops)
82 lc = malloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT);
85 bzero(lc, sizeof(*lc));
90 TAILQ_INSERT_HEAD(&classes, lc, link);
96 linker_file_sysinit(linker_file_t lf)
98 struct sysinit** start, ** stop;
99 struct sysinit** sipp;
100 struct sysinit** xipp;
101 struct sysinit* save;
102 const moduledata_t *moddata;
105 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
108 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
109 return 0; /* XXX is this correct ? No sysinit ? */
112 for (sipp = start; sipp < stop; sipp++) {
113 if ((*sipp)->func == module_register_init) {
114 moddata = (*sipp)->udata;
115 error = module_register(moddata, lf);
117 printf("linker_file_sysinit \"%s\" failed to register! %d\n",
118 lf->filename, error);
125 * Perform a bubble sort of the system initialization objects by
126 * their subsystem (primary key) and order (secondary key).
128 * Since some things care about execution order, this is the
129 * operation which ensures continued function.
131 for (sipp = start; sipp < stop; sipp++) {
132 for (xipp = sipp + 1; xipp < stop; xipp++) {
133 if ((*sipp)->subsystem < (*xipp)->subsystem ||
134 ((*sipp)->subsystem == (*xipp)->subsystem &&
135 (*sipp)->order <= (*xipp)->order))
145 * Traverse the (now) ordered list of system initialization tasks.
146 * Perform each task, and continue on to the next task.
148 for (sipp = start; sipp < stop; sipp++) {
149 if ((*sipp)->subsystem == SI_SUB_DUMMY)
150 continue; /* skip dummy task(s)*/
153 (*((*sipp)->func))((*sipp)->udata);
155 return 0; /* no errors */
159 linker_file_sysuninit(linker_file_t lf)
161 struct sysinit** start, ** stop;
162 struct sysinit** sipp;
163 struct sysinit** xipp;
164 struct sysinit* save;
166 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
169 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0)
173 * Perform a reverse bubble sort of the system initialization objects
174 * by their subsystem (primary key) and order (secondary key).
176 * Since some things care about execution order, this is the
177 * operation which ensures continued function.
179 for (sipp = start; sipp < stop; sipp++) {
180 for (xipp = sipp + 1; xipp < stop; xipp++) {
181 if ((*sipp)->subsystem > (*xipp)->subsystem ||
182 ((*sipp)->subsystem == (*xipp)->subsystem &&
183 (*sipp)->order >= (*xipp)->order))
193 * Traverse the (now) ordered list of system initialization tasks.
194 * Perform each task, and continue on to the next task.
196 for (sipp = start; sipp < stop; sipp++) {
197 if ((*sipp)->subsystem == SI_SUB_DUMMY)
198 continue; /* skip dummy task(s)*/
201 (*((*sipp)->func))((*sipp)->udata);
206 linker_file_register_sysctls(linker_file_t lf)
208 struct sysctl_oid **start, **stop, **oidp;
210 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
213 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
215 for (oidp = start; oidp < stop; oidp++)
216 sysctl_register_oid(*oidp);
220 linker_file_unregister_sysctls(linker_file_t lf)
222 struct sysctl_oid **start, **stop, **oidp;
224 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n",
227 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
229 for (oidp = start; oidp < stop; oidp++)
230 sysctl_unregister_oid(*oidp);
234 linker_load_file(const char* filename, linker_file_t* result)
238 int foundfile, error = 0;
241 /* Refuse to load modules if securelevel raised */
245 lf = linker_find_file_by_name(filename);
247 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
253 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
254 if (koname == NULL) {
258 sprintf(koname, "%s.ko", filename);
261 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
262 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
263 filename, lc->desc));
265 error = lc->ops->load_file(koname, &lf); /* First with .ko */
266 if (lf == NULL && error == ENOENT)
267 error = lc->ops->load_file(filename, &lf); /* Then try without */
269 * If we got something other than ENOENT, then it exists but we cannot
270 * load it for some other reason.
275 linker_file_register_sysctls(lf);
276 error = linker_file_sysinit(lf);
283 * Less than ideal, but tells the user whether it failed to load or
284 * the module was not found.
288 * Format not recognized or otherwise unloadable.
289 * When loading a module that is statically built into
290 * the kernel EEXIST percolates back up as the return
291 * value. Preserve this so that apps like sysinstall
292 * can recognize this special case and not post bogus
298 error = ENOENT; /* Nothing found */
302 free(koname, M_LINKER);
307 linker_find_file_by_name(const char* filename)
309 linker_file_t lf = 0;
312 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
315 sprintf(koname, "%s.ko", filename);
317 lockmgr(&lock, LK_SHARED, 0, curthread);
318 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
319 if (!strcmp(lf->filename, koname))
321 if (!strcmp(lf->filename, filename))
324 lockmgr(&lock, LK_RELEASE, 0, curthread);
328 free(koname, M_LINKER);
333 linker_find_file_by_id(int fileid)
335 linker_file_t lf = 0;
337 lockmgr(&lock, LK_SHARED, 0, curthread);
338 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link))
339 if (lf->id == fileid)
341 lockmgr(&lock, LK_RELEASE, 0, curthread);
347 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
349 linker_file_t lf = 0;
351 const char *filename;
353 filename = rindex(pathname, '/');
354 if (filename && filename[1])
359 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
360 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
361 namelen = strlen(filename) + 1;
362 lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
365 bzero(lf, sizeof(*lf));
370 lf->filename = (char*) (lf + 1);
371 strcpy(lf->filename, filename);
372 lf->id = next_file_id++;
375 STAILQ_INIT(&lf->common);
376 TAILQ_INIT(&lf->modules);
380 TAILQ_INSERT_TAIL(&linker_files, lf, link);
383 lockmgr(&lock, LK_RELEASE, 0, curthread);
388 linker_file_unload(linker_file_t file)
391 struct common_symbol* cp;
395 /* Refuse to unload modules if securelevel raised */
399 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
400 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
401 if (file->refs == 1) {
402 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
404 * Inform any modules associated with this file.
406 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
407 next = module_getfnext(mod);
410 * Give the module a chance to veto the unload.
412 if ((error = module_unload(mod)) != 0) {
413 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
415 lockmgr(&lock, LK_RELEASE, 0, curthread);
424 if (file->refs > 0) {
425 lockmgr(&lock, LK_RELEASE, 0, curthread);
429 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
430 if (file->flags & LINKER_FILE_LINKED) {
431 linker_file_sysuninit(file);
432 linker_file_unregister_sysctls(file);
435 TAILQ_REMOVE(&linker_files, file, link);
436 lockmgr(&lock, LK_RELEASE, 0, curthread);
438 for (i = 0; i < file->ndeps; i++)
439 linker_file_unload(file->deps[i]);
440 free(file->deps, M_LINKER);
442 for (cp = STAILQ_FIRST(&file->common); cp;
443 cp = STAILQ_FIRST(&file->common)) {
444 STAILQ_REMOVE(&file->common, cp, common_symbol, link);
448 file->ops->unload(file);
449 free(file, M_LINKER);
456 linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
458 linker_file_t* newdeps;
460 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*),
464 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*));
467 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
468 free(file->deps, M_LINKER);
470 file->deps = newdeps;
471 file->deps[file->ndeps] = dep;
478 * Locate a linker set and its contents.
479 * This is a helper function to avoid linker_if.h exposure elsewhere.
480 * Note: firstp and lastp are really void ***
483 linker_file_lookup_set(linker_file_t file, const char *name,
484 void *firstp, void *lastp, int *countp)
486 return file->ops->lookup_set(file, name, firstp, lastp, countp);
490 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr)
493 linker_symval_t symval;
495 size_t common_size = 0;
498 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
501 if (file->ops->lookup_symbol(file, name, &sym) == 0) {
502 file->ops->symbol_values(file, sym, &symval);
505 * XXX Assume a common symbol if its value is 0 and it has a non-zero
506 * size, otherwise it could be an absolute symbol with a value of 0.
508 if (symval.value == 0 && symval.size != 0) {
510 * For commons, first look them up in the dependancies and
511 * only allocate space if not found there.
513 common_size = symval.size;
515 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
516 *raddr = symval.value;
521 for (i = 0; i < file->ndeps; i++) {
522 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) {
523 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", *raddr));
528 /* If we have not found it in the dependencies, search globally */
529 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
530 /* But skip the current file if it's on the list */
533 /* And skip the files we searched above */
534 for (i = 0; i < file->ndeps; i++)
535 if (lf == file->deps[i])
539 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) {
540 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", *raddr));
546 if (common_size > 0) {
548 * This is a common symbol which was not found in the
549 * dependancies. We maintain a simple common symbol table in
552 struct common_symbol* cp;
554 for (cp = STAILQ_FIRST(&file->common); cp;
555 cp = STAILQ_NEXT(cp, link))
556 if (!strcmp(cp->name, name)) {
557 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
558 *raddr = cp->address;
563 * Round the symbol size up to align.
565 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
566 cp = malloc(sizeof(struct common_symbol)
571 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
574 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
576 cp->address = (caddr_t) (cp + 1);
577 cp->name = cp->address + common_size;
578 strcpy(cp->name, name);
579 bzero(cp->address, common_size);
580 STAILQ_INSERT_TAIL(&file->common, cp, link);
582 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
583 *raddr = cp->address;
587 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
593 * DDB Helpers. DDB has to look across multiple files with their own
594 * symbol tables and string tables.
596 * Note that we do not obey list locking protocols here. We really don't
597 * need DDB to hang because somebody's got the lock held. We'll take the
598 * chance that the files list is inconsistant instead.
602 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
606 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
607 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0)
614 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
617 u_long off = (uintptr_t)value;
618 u_long diff, bestdiff;
624 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
625 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0)
627 if (es != 0 && diff < bestdiff) {
646 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
650 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
651 if (lf->ops->symbol_values(lf, sym, symval) == 0)
664 kldload(struct kldload_args *uap)
666 struct thread *td = curthread;
667 char* filename = NULL, *modulename;
671 uap->sysmsg_result = -1;
673 if (securelevel > 0) /* redundant, but that's OK */
676 if ((error = suser(td)) != 0)
679 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
680 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
683 /* Can't load more than one module with the same name */
684 modulename = rindex(filename, '/');
685 if (modulename == NULL)
686 modulename = filename;
689 if (linker_find_file_by_name(modulename)) {
694 if ((error = linker_load_file(filename, &lf)) != 0)
698 uap->sysmsg_result = lf->id;
702 free(filename, M_TEMP);
707 kldunload(struct kldunload_args *uap)
709 struct thread *td = curthread;
713 if (securelevel > 0) /* redundant, but that's OK */
716 if ((error = suser(td)) != 0)
719 lf = linker_find_file_by_id(SCARG(uap, fileid));
721 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
722 if (lf->userrefs == 0) {
723 printf("linkerunload: attempt to unload file that was loaded by the kernel\n");
728 error = linker_file_unload(lf);
739 kldfind(struct kldfind_args *uap)
741 char *filename = NULL, *modulename;
745 uap->sysmsg_result = -1;
747 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
748 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
751 modulename = rindex(filename, '/');
752 if (modulename == NULL)
753 modulename = filename;
755 lf = linker_find_file_by_name(modulename);
757 uap->sysmsg_result = lf->id;
763 free(filename, M_TEMP);
768 kldnext(struct kldnext_args *uap)
773 if (SCARG(uap, fileid) == 0) {
774 if (TAILQ_FIRST(&linker_files))
775 uap->sysmsg_result = TAILQ_FIRST(&linker_files)->id;
777 uap->sysmsg_result = 0;
781 lf = linker_find_file_by_id(SCARG(uap, fileid));
783 if (TAILQ_NEXT(lf, link))
784 uap->sysmsg_result = TAILQ_NEXT(lf, link)->id;
786 uap->sysmsg_result = 0;
794 kldstat(struct kldstat_args *uap)
799 struct kld_file_stat* stat;
802 lf = linker_find_file_by_id(SCARG(uap, fileid));
808 stat = SCARG(uap, stat);
811 * Check the version of the user's structure.
813 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
815 if (version != sizeof(struct kld_file_stat)) {
820 namelen = strlen(lf->filename) + 1;
821 if (namelen > MAXPATHLEN)
822 namelen = MAXPATHLEN;
823 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
825 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
827 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
829 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0)
831 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
834 uap->sysmsg_result = 0;
841 kldfirstmod(struct kldfirstmod_args *uap)
846 lf = linker_find_file_by_id(SCARG(uap, fileid));
848 if (TAILQ_FIRST(&lf->modules))
849 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules));
851 uap->sysmsg_result = 0;
859 kldsym(struct kldsym_args *uap)
863 linker_symval_t symval;
865 struct kld_sym_lookup lookup;
868 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0)
870 if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) {
875 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
876 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
879 if (SCARG(uap, fileid) != 0) {
880 lf = linker_find_file_by_id(SCARG(uap, fileid));
885 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
886 lf->ops->symbol_values(lf, sym, &symval) == 0) {
887 lookup.symvalue = (uintptr_t)symval.value;
888 lookup.symsize = symval.size;
889 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
893 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
894 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
895 lf->ops->symbol_values(lf, sym, &symval) == 0) {
896 lookup.symvalue = (uintptr_t)symval.value;
897 lookup.symsize = symval.size;
898 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
907 free(symstr, M_TEMP);
911 static struct mod_metadata *
912 find_mod_metadata(const char *modname)
915 struct mod_metadata **mdp;
916 struct mod_metadata *mdt;
919 * Strip path prefixes and any dot extension
921 for (len = strlen(modname) - 1; len >= 0; --len) {
922 if (modname[len] == '/')
926 for (len = 0; modname[len] && modname[len] != '.'; ++len)
930 * Look for the module declaration
932 SET_FOREACH(mdp, modmetadata_set) {
934 if (mdt->md_type != MDT_MODULE)
936 if (strlen(mdt->md_cval) == len &&
937 strncmp(mdt->md_cval, modname, len) == 0
946 * Preloaded module support
949 linker_preload(void* arg)
957 struct sysinit **sipp;
958 const moduledata_t *moddata;
959 struct sysinit **si_start, **si_stop;
962 while ((modptr = preload_search_next_name(modptr)) != NULL) {
963 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
964 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
965 if (modname == NULL) {
966 printf("Preloaded module at %p does not have a name!\n", modptr);
969 if (modtype == NULL) {
970 printf("Preloaded module at %p does not have a type!\n", modptr);
975 * This is a hack at the moment, but what's in FreeBSD-5 is even
976 * worse so I'd rather the hack.
978 printf("Preloaded %s \"%s\" at %p", modtype, modname, modptr);
979 if (find_mod_metadata(modname)) {
980 printf(" (ignored, already in static kernel)\n");
985 lf = linker_find_file_by_name(modname);
991 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
992 error = lc->ops->load_file(modname, &lf);
1001 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) {
1003 * This is to set the sysinit moduledata so that the module
1004 * can attach itself to the correct containing file.
1005 * The sysinit could be run at *any* time.
1007 for (sipp = si_start; sipp < si_stop; sipp++) {
1008 if ((*sipp)->func == module_register_init) {
1009 moddata = (*sipp)->udata;
1010 error = module_register(moddata, lf);
1012 printf("Preloaded %s \"%s\" failed to register: %d\n",
1013 modtype, modname, error);
1016 sysinit_add(si_start, si_stop);
1018 linker_file_register_sysctls(lf);
1023 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1026 * Search for a not-loaded module by name.
1028 * Modules may be found in the following locations:
1030 * - preloaded (result is just the module name)
1031 * - on disk (result is full path to module)
1033 * If the module name is qualified in any way (contains path, etc.)
1034 * the we simply return a copy of it.
1036 * The search path can be manipulated via sysctl. Note that we use the ';'
1037 * character as a separator to be consistent with the bootloader.
1040 static char linker_path[MAXPATHLEN] = "/;/boot/;/modules/";
1042 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1043 sizeof(linker_path), "module load search path");
1046 linker_strdup(const char *str)
1050 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
1051 strcpy(result, str);
1056 linker_search_path(const char *name)
1058 struct nameidata nd;
1059 struct thread *td = curthread;
1060 char *cp, *ep, *result;
1064 /* qualified at all? */
1065 if (index(name, '/'))
1066 return(linker_strdup(name));
1068 /* traverse the linker path */
1072 /* find the end of this component */
1073 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++)
1075 result = malloc((strlen(name) + (ep - cp) + 1), M_LINKER, M_WAITOK);
1076 if (result == NULL) /* actually ENOMEM */
1079 strncpy(result, cp, ep - cp);
1080 strcpy(result + (ep - cp), name);
1083 * Attempt to open the file, and return the path if we succeed and it's
1086 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_SYSSPACE, result, td);
1087 error = vn_open(&nd, FREAD, 0);
1089 NDFREE(&nd, NDF_ONLY_PNBUF);
1090 type = nd.ni_vp->v_type;
1091 VOP_UNLOCK(nd.ni_vp, 0, td);
1092 vn_close(nd.ni_vp, FREAD, td);
1096 free(result, M_LINKER);