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 1.16 2003/11/21 23:30:42 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));
252 if (find_mod_metadata(filename)) {
253 if (linker_kernel_file)
254 ++linker_kernel_file->refs;
255 *result = linker_kernel_file;
259 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
260 if (koname == NULL) {
264 sprintf(koname, "%s.ko", filename);
267 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
268 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
269 filename, lc->desc));
271 error = lc->ops->load_file(koname, &lf); /* First with .ko */
272 if (lf == NULL && error == ENOENT)
273 error = lc->ops->load_file(filename, &lf); /* Then try without */
275 * If we got something other than ENOENT, then it exists but we cannot
276 * load it for some other reason.
281 linker_file_register_sysctls(lf);
282 error = linker_file_sysinit(lf);
289 * Less than ideal, but tells the user whether it failed to load or
290 * the module was not found.
294 * Format not recognized or otherwise unloadable.
295 * When loading a module that is statically built into
296 * the kernel EEXIST percolates back up as the return
297 * value. Preserve this so that apps like sysinstall
298 * can recognize this special case and not post bogus
304 error = ENOENT; /* Nothing found */
309 free(koname, M_LINKER);
314 linker_find_file_by_name(const char* filename)
316 linker_file_t lf = 0;
320 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i)
324 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
327 sprintf(koname, "%s.ko", filename);
329 lockmgr(&lock, LK_SHARED, 0, curthread);
330 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
331 if (!strcmp(lf->filename, koname))
333 if (!strcmp(lf->filename, filename))
336 lockmgr(&lock, LK_RELEASE, 0, curthread);
340 free(koname, M_LINKER);
345 linker_find_file_by_id(int fileid)
347 linker_file_t lf = 0;
349 lockmgr(&lock, LK_SHARED, 0, curthread);
350 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link))
351 if (lf->id == fileid)
353 lockmgr(&lock, LK_RELEASE, 0, curthread);
359 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
361 linker_file_t lf = 0;
363 const char *filename;
365 filename = rindex(pathname, '/');
366 if (filename && filename[1])
371 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
372 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
373 namelen = strlen(filename) + 1;
374 lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
377 bzero(lf, sizeof(*lf));
382 lf->filename = (char*) (lf + 1);
383 strcpy(lf->filename, filename);
384 lf->id = next_file_id++;
387 STAILQ_INIT(&lf->common);
388 TAILQ_INIT(&lf->modules);
392 TAILQ_INSERT_TAIL(&linker_files, lf, link);
395 lockmgr(&lock, LK_RELEASE, 0, curthread);
400 linker_file_unload(linker_file_t file)
403 struct common_symbol* cp;
407 /* Refuse to unload modules if securelevel raised */
411 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
412 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
413 if (file->refs == 1) {
414 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
416 * Inform any modules associated with this file.
418 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
419 next = module_getfnext(mod);
422 * Give the module a chance to veto the unload.
424 if ((error = module_unload(mod)) != 0) {
425 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
427 lockmgr(&lock, LK_RELEASE, 0, curthread);
436 if (file->refs > 0) {
437 lockmgr(&lock, LK_RELEASE, 0, curthread);
441 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
442 if (file->flags & LINKER_FILE_LINKED) {
443 linker_file_sysuninit(file);
444 linker_file_unregister_sysctls(file);
447 TAILQ_REMOVE(&linker_files, file, link);
448 lockmgr(&lock, LK_RELEASE, 0, curthread);
450 for (i = 0; i < file->ndeps; i++)
451 linker_file_unload(file->deps[i]);
452 free(file->deps, M_LINKER);
454 for (cp = STAILQ_FIRST(&file->common); cp;
455 cp = STAILQ_FIRST(&file->common)) {
456 STAILQ_REMOVE(&file->common, cp, common_symbol, link);
460 file->ops->unload(file);
461 free(file, M_LINKER);
468 linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
470 linker_file_t* newdeps;
472 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*),
476 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*));
479 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
480 free(file->deps, M_LINKER);
482 file->deps = newdeps;
483 file->deps[file->ndeps] = dep;
490 * Locate a linker set and its contents.
491 * This is a helper function to avoid linker_if.h exposure elsewhere.
492 * Note: firstp and lastp are really void ***
495 linker_file_lookup_set(linker_file_t file, const char *name,
496 void *firstp, void *lastp, int *countp)
498 return file->ops->lookup_set(file, name, firstp, lastp, countp);
502 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr)
505 linker_symval_t symval;
507 size_t common_size = 0;
510 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
513 if (file->ops->lookup_symbol(file, name, &sym) == 0) {
514 file->ops->symbol_values(file, sym, &symval);
517 * XXX Assume a common symbol if its value is 0 and it has a non-zero
518 * size, otherwise it could be an absolute symbol with a value of 0.
520 if (symval.value == 0 && symval.size != 0) {
522 * For commons, first look them up in the dependancies and
523 * only allocate space if not found there.
525 common_size = symval.size;
527 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
528 *raddr = symval.value;
533 for (i = 0; i < file->ndeps; i++) {
534 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) {
535 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", *raddr));
540 /* If we have not found it in the dependencies, search globally */
541 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
542 /* But skip the current file if it's on the list */
545 /* And skip the files we searched above */
546 for (i = 0; i < file->ndeps; i++)
547 if (lf == file->deps[i])
551 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) {
552 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", *raddr));
558 if (common_size > 0) {
560 * This is a common symbol which was not found in the
561 * dependancies. We maintain a simple common symbol table in
564 struct common_symbol* cp;
566 for (cp = STAILQ_FIRST(&file->common); cp;
567 cp = STAILQ_NEXT(cp, link))
568 if (!strcmp(cp->name, name)) {
569 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
570 *raddr = cp->address;
575 * Round the symbol size up to align.
577 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
578 cp = malloc(sizeof(struct common_symbol)
583 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
586 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
588 cp->address = (caddr_t) (cp + 1);
589 cp->name = cp->address + common_size;
590 strcpy(cp->name, name);
591 bzero(cp->address, common_size);
592 STAILQ_INSERT_TAIL(&file->common, cp, link);
594 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
595 *raddr = cp->address;
599 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
605 * DDB Helpers. DDB has to look across multiple files with their own
606 * symbol tables and string tables.
608 * Note that we do not obey list locking protocols here. We really don't
609 * need DDB to hang because somebody's got the lock held. We'll take the
610 * chance that the files list is inconsistant instead.
614 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
618 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
619 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0)
626 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
629 u_long off = (uintptr_t)value;
630 u_long diff, bestdiff;
636 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
637 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0)
639 if (es != 0 && diff < bestdiff) {
658 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
662 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
663 if (lf->ops->symbol_values(lf, sym, symval) == 0)
676 kldload(struct kldload_args *uap)
678 struct thread *td = curthread;
679 char* filename = NULL, *modulename;
683 uap->sysmsg_result = -1;
685 if (securelevel > 0) /* redundant, but that's OK */
688 if ((error = suser(td)) != 0)
691 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
692 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
695 /* Can't load more than one module with the same name */
696 modulename = rindex(filename, '/');
697 if (modulename == NULL)
698 modulename = filename;
701 if (linker_find_file_by_name(modulename)) {
706 if ((error = linker_load_file(filename, &lf)) != 0)
710 uap->sysmsg_result = lf->id;
714 free(filename, M_TEMP);
719 kldunload(struct kldunload_args *uap)
721 struct thread *td = curthread;
725 if (securelevel > 0) /* redundant, but that's OK */
728 if ((error = suser(td)) != 0)
731 lf = linker_find_file_by_id(SCARG(uap, fileid));
733 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
734 if (lf->userrefs == 0) {
735 printf("linkerunload: attempt to unload file that was loaded by the kernel\n");
740 error = linker_file_unload(lf);
751 kldfind(struct kldfind_args *uap)
753 char *filename = NULL, *modulename;
757 uap->sysmsg_result = -1;
759 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
760 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
763 modulename = rindex(filename, '/');
764 if (modulename == NULL)
765 modulename = filename;
767 lf = linker_find_file_by_name(modulename);
769 uap->sysmsg_result = lf->id;
775 free(filename, M_TEMP);
780 kldnext(struct kldnext_args *uap)
785 if (SCARG(uap, fileid) == 0) {
786 if (TAILQ_FIRST(&linker_files))
787 uap->sysmsg_result = TAILQ_FIRST(&linker_files)->id;
789 uap->sysmsg_result = 0;
793 lf = linker_find_file_by_id(SCARG(uap, fileid));
795 if (TAILQ_NEXT(lf, link))
796 uap->sysmsg_result = TAILQ_NEXT(lf, link)->id;
798 uap->sysmsg_result = 0;
806 kldstat(struct kldstat_args *uap)
811 struct kld_file_stat* stat;
814 lf = linker_find_file_by_id(SCARG(uap, fileid));
820 stat = SCARG(uap, stat);
823 * Check the version of the user's structure.
825 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
827 if (version != sizeof(struct kld_file_stat)) {
832 namelen = strlen(lf->filename) + 1;
833 if (namelen > MAXPATHLEN)
834 namelen = MAXPATHLEN;
835 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
837 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
839 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
841 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0)
843 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
846 uap->sysmsg_result = 0;
853 kldfirstmod(struct kldfirstmod_args *uap)
858 lf = linker_find_file_by_id(SCARG(uap, fileid));
860 if (TAILQ_FIRST(&lf->modules))
861 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules));
863 uap->sysmsg_result = 0;
871 kldsym(struct kldsym_args *uap)
875 linker_symval_t symval;
877 struct kld_sym_lookup lookup;
880 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0)
882 if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) {
887 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
888 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
891 if (SCARG(uap, fileid) != 0) {
892 lf = linker_find_file_by_id(SCARG(uap, fileid));
897 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
898 lf->ops->symbol_values(lf, sym, &symval) == 0) {
899 lookup.symvalue = (uintptr_t)symval.value;
900 lookup.symsize = symval.size;
901 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
905 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
906 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
907 lf->ops->symbol_values(lf, sym, &symval) == 0) {
908 lookup.symvalue = (uintptr_t)symval.value;
909 lookup.symsize = symval.size;
910 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
919 free(symstr, M_TEMP);
924 * Look for module metadata in the static kernel
926 struct mod_metadata *
927 find_mod_metadata(const char *modname)
930 struct mod_metadata **mdp;
931 struct mod_metadata *mdt;
934 * Strip path prefixes and any dot extension. MDT_MODULE names
935 * are just the module name without a path or ".ko".
937 for (len = strlen(modname) - 1; len >= 0; --len) {
938 if (modname[len] == '/')
942 for (len = 0; modname[len] && modname[len] != '.'; ++len)
946 * Look for the module declaration
948 SET_FOREACH(mdp, modmetadata_set) {
950 if (mdt->md_type != MDT_MODULE)
952 if (strlen(mdt->md_cval) == len &&
953 strncmp(mdt->md_cval, modname, len) == 0
962 * Preloaded module support
965 linker_preload(void* arg)
973 struct sysinit **sipp;
974 const moduledata_t *moddata;
975 struct sysinit **si_start, **si_stop;
978 while ((modptr = preload_search_next_name(modptr)) != NULL) {
979 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
980 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
981 if (modname == NULL) {
982 printf("Preloaded module at %p does not have a name!\n", modptr);
985 if (modtype == NULL) {
986 printf("Preloaded module at %p does not have a type!\n", modptr);
991 * This is a hack at the moment, but what's in FreeBSD-5 is even
992 * worse so I'd rather the hack.
994 printf("Preloaded %s \"%s\" at %p", modtype, modname, modptr);
995 if (find_mod_metadata(modname)) {
996 printf(" (ignored, already in static kernel)\n");
1001 lf = linker_find_file_by_name(modname);
1007 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
1008 error = lc->ops->load_file(modname, &lf);
1017 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) {
1019 * This is to set the sysinit moduledata so that the module
1020 * can attach itself to the correct containing file.
1021 * The sysinit could be run at *any* time.
1023 for (sipp = si_start; sipp < si_stop; sipp++) {
1024 if ((*sipp)->func == module_register_init) {
1025 moddata = (*sipp)->udata;
1026 error = module_register(moddata, lf);
1028 printf("Preloaded %s \"%s\" failed to register: %d\n",
1029 modtype, modname, error);
1032 sysinit_add(si_start, si_stop);
1034 linker_file_register_sysctls(lf);
1039 SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1042 * Search for a not-loaded module by name.
1044 * Modules may be found in the following locations:
1046 * - preloaded (result is just the module name)
1047 * - on disk (result is full path to module)
1049 * If the module name is qualified in any way (contains path, etc.)
1050 * the we simply return a copy of it.
1052 * The search path can be manipulated via sysctl. Note that we use the ';'
1053 * character as a separator to be consistent with the bootloader.
1056 static char linker_path[MAXPATHLEN] = "/;/boot/;/modules/";
1058 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1059 sizeof(linker_path), "module load search path");
1062 linker_strdup(const char *str)
1066 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
1067 strcpy(result, str);
1072 linker_search_path(const char *name)
1074 struct nameidata nd;
1075 struct thread *td = curthread;
1076 char *cp, *ep, *result;
1080 /* qualified at all? */
1081 if (index(name, '/'))
1082 return(linker_strdup(name));
1084 /* traverse the linker path */
1088 /* find the end of this component */
1089 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++)
1091 result = malloc((strlen(name) + (ep - cp) + 1), M_LINKER, M_WAITOK);
1092 if (result == NULL) /* actually ENOMEM */
1095 strncpy(result, cp, ep - cp);
1096 strcpy(result + (ep - cp), name);
1099 * Attempt to open the file, and return the path if we succeed and it's
1102 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_SYSSPACE, result, td);
1103 error = vn_open(&nd, FREAD, 0);
1105 NDFREE(&nd, NDF_ONLY_PNBUF);
1106 type = nd.ni_vp->v_type;
1107 VOP_UNLOCK(nd.ni_vp, 0, td);
1108 vn_close(nd.ni_vp, FREAD, td);
1112 free(result, M_LINKER);