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 1.38 2007/06/07 22:58:11 corecode 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/nlookup.h>
45 #include <sys/vnode.h>
46 #include <sys/sysctl.h>
48 #include <vm/vm_zone.h>
50 #ifdef _KERNEL_VIRTUAL
58 /* Metadata from the static kernel */
59 SET_DECLARE(modmetadata_set, struct mod_metadata);
60 MALLOC_DEFINE(M_LINKER, "kld", "kernel linker");
62 linker_file_t linker_current_file;
63 linker_file_t linker_kernel_file;
65 static struct lock lock; /* lock for the file list */
66 static linker_class_list_t classes;
67 static linker_file_list_t linker_files;
68 static int next_file_id = 1;
71 linker_init(void* arg)
73 lockinit(&lock, "klink", 0, 0);
75 TAILQ_INIT(&linker_files);
78 SYSINIT(linker, SI_BOOT2_KLD, SI_ORDER_FIRST, linker_init, 0);
81 linker_add_class(const char* desc, void* priv,
82 struct linker_class_ops* ops)
86 lc = kmalloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT);
89 bzero(lc, sizeof(*lc));
94 TAILQ_INSERT_HEAD(&classes, lc, link);
100 linker_file_sysinit(linker_file_t lf)
102 struct sysinit** start, ** stop;
103 struct sysinit** sipp;
104 struct sysinit** xipp;
105 struct sysinit* save;
106 const moduledata_t *moddata;
109 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
112 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
113 return 0; /* XXX is this correct ? No sysinit ? */
116 for (sipp = start; sipp < stop; sipp++) {
117 if ((*sipp)->func == module_register_init) {
118 moddata = (*sipp)->udata;
119 error = module_register(moddata, lf);
121 kprintf("linker_file_sysinit \"%s\" failed to register! %d\n",
122 lf->filename, error);
129 * Perform a bubble sort of the system initialization objects by
130 * their subsystem (primary key) and order (secondary key).
132 * Since some things care about execution order, this is the
133 * operation which ensures continued function.
135 for (sipp = start; sipp < stop; sipp++) {
136 for (xipp = sipp + 1; xipp < stop; xipp++) {
137 if ((*sipp)->subsystem < (*xipp)->subsystem ||
138 ((*sipp)->subsystem == (*xipp)->subsystem &&
139 (*sipp)->order <= (*xipp)->order))
149 * Traverse the (now) ordered list of system initialization tasks.
150 * Perform each task, and continue on to the next task.
152 for (sipp = start; sipp < stop; sipp++) {
153 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY)
154 continue; /* skip dummy task(s)*/
157 (*((*sipp)->func))((*sipp)->udata);
159 return 0; /* no errors */
163 linker_file_sysuninit(linker_file_t lf)
165 struct sysinit** start, ** stop;
166 struct sysinit** sipp;
167 struct sysinit** xipp;
168 struct sysinit* save;
170 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
173 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0)
177 * Perform a reverse bubble sort of the system initialization objects
178 * by their subsystem (primary key) and order (secondary key).
180 * Since some things care about execution order, this is the
181 * operation which ensures continued function.
183 for (sipp = start; sipp < stop; sipp++) {
184 for (xipp = sipp + 1; xipp < stop; xipp++) {
185 if ((*sipp)->subsystem > (*xipp)->subsystem ||
186 ((*sipp)->subsystem == (*xipp)->subsystem &&
187 (*sipp)->order >= (*xipp)->order))
197 * Traverse the (now) ordered list of system initialization tasks.
198 * Perform each task, and continue on to the next task.
200 for (sipp = start; sipp < stop; sipp++) {
201 if ((*sipp)->subsystem == SI_SPECIAL_DUMMY)
202 continue; /* skip dummy task(s)*/
205 (*((*sipp)->func))((*sipp)->udata);
210 linker_file_register_sysctls(linker_file_t lf)
212 struct sysctl_oid **start, **stop, **oidp;
214 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
217 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
219 for (oidp = start; oidp < stop; oidp++)
220 sysctl_register_oid(*oidp);
224 linker_file_unregister_sysctls(linker_file_t lf)
226 struct sysctl_oid **start, **stop, **oidp;
228 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n",
231 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
233 for (oidp = start; oidp < stop; oidp++)
234 sysctl_unregister_oid(*oidp);
238 linker_load_file(const char* filename, linker_file_t* result)
242 int foundfile, error = 0;
245 /* Refuse to load modules if securelevel raised */
246 if (securelevel > 0 || kernel_mem_readonly)
249 lf = linker_find_file_by_name(filename);
251 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
256 if (find_mod_metadata(filename)) {
257 if (linker_kernel_file)
258 ++linker_kernel_file->refs;
259 *result = linker_kernel_file;
263 koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
264 if (koname == NULL) {
268 ksprintf(koname, "%s.ko", filename);
271 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
272 KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
273 filename, lc->desc));
275 error = lc->ops->load_file(koname, &lf); /* First with .ko */
276 if (lf == NULL && error == ENOENT)
277 error = lc->ops->load_file(filename, &lf); /* Then try without */
279 * If we got something other than ENOENT, then it exists but we cannot
280 * load it for some other reason.
285 linker_file_register_sysctls(lf);
286 error = linker_file_sysinit(lf);
293 * Less than ideal, but tells the user whether it failed to load or
294 * the module was not found.
298 * Format not recognized or otherwise unloadable.
299 * When loading a module that is statically built into
300 * the kernel EEXIST percolates back up as the return
301 * value. Preserve this so that apps like sysinstall
302 * can recognize this special case and not post bogus
308 error = ENOENT; /* Nothing found */
313 kfree(koname, M_LINKER);
318 linker_find_file_by_name(const char* filename)
320 linker_file_t lf = 0;
324 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i)
328 koname = kmalloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
331 ksprintf(koname, "%s.ko", filename);
333 lockmgr(&lock, LK_SHARED);
334 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
335 if (!strcmp(lf->filename, koname))
337 if (!strcmp(lf->filename, filename))
340 lockmgr(&lock, LK_RELEASE);
344 kfree(koname, M_LINKER);
349 linker_find_file_by_id(int fileid)
351 linker_file_t lf = 0;
353 lockmgr(&lock, LK_SHARED);
354 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link))
355 if (lf->id == fileid)
357 lockmgr(&lock, LK_RELEASE);
363 linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
365 linker_file_t lf = 0;
367 const char *filename;
369 filename = rindex(pathname, '/');
370 if (filename && filename[1])
375 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
376 lockmgr(&lock, LK_EXCLUSIVE);
377 namelen = strlen(filename) + 1;
378 lf = kmalloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
381 bzero(lf, sizeof(*lf));
386 lf->filename = (char*) (lf + 1);
387 strcpy(lf->filename, filename);
388 lf->id = next_file_id++;
391 STAILQ_INIT(&lf->common);
392 TAILQ_INIT(&lf->modules);
396 TAILQ_INSERT_TAIL(&linker_files, lf, link);
399 lockmgr(&lock, LK_RELEASE);
404 linker_file_unload(linker_file_t file)
407 struct common_symbol* cp;
411 /* Refuse to unload modules if securelevel raised */
412 if (securelevel > 0 || kernel_mem_readonly)
415 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
416 lockmgr(&lock, LK_EXCLUSIVE);
417 if (file->refs == 1) {
418 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
420 * Temporarily bump file->refs to prevent recursive unloading
425 * Inform any modules associated with this file.
427 mod = TAILQ_FIRST(&file->modules);
430 * Give the module a chance to veto the unload. Note that the
431 * act of unloading the module may cause other modules in the
432 * same file list to be unloaded recursively.
434 if ((error = module_unload(mod)) != 0) {
435 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
437 lockmgr(&lock, LK_RELEASE);
443 * Recursive relationships may prevent the release from
444 * immediately removing the module, or may remove other
445 * modules in the list.
447 next = module_getfnext(mod);
453 * Since we intend to destroy the file structure, we expect all
454 * modules to have been removed by now.
456 for (mod = TAILQ_FIRST(&file->modules);
458 mod = module_getfnext(mod)
460 kprintf("linker_file_unload: module %p still has refs!\n", mod);
466 if (file->refs > 0) {
467 lockmgr(&lock, LK_RELEASE);
471 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
472 if (file->flags & LINKER_FILE_LINKED) {
473 linker_file_sysuninit(file);
474 linker_file_unregister_sysctls(file);
477 TAILQ_REMOVE(&linker_files, file, link);
478 lockmgr(&lock, LK_RELEASE);
480 for (i = 0; i < file->ndeps; i++)
481 linker_file_unload(file->deps[i]);
482 kfree(file->deps, M_LINKER);
484 for (cp = STAILQ_FIRST(&file->common); cp;
485 cp = STAILQ_FIRST(&file->common)) {
486 STAILQ_REMOVE(&file->common, cp, common_symbol, link);
490 file->ops->unload(file);
491 kfree(file, M_LINKER);
498 linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
500 linker_file_t* newdeps;
502 newdeps = kmalloc((file->ndeps + 1) * sizeof(linker_file_t*),
506 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*));
509 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
510 kfree(file->deps, M_LINKER);
512 file->deps = newdeps;
513 file->deps[file->ndeps] = dep;
520 * Locate a linker set and its contents.
521 * This is a helper function to avoid linker_if.h exposure elsewhere.
522 * Note: firstp and lastp are really void ***
525 linker_file_lookup_set(linker_file_t file, const char *name,
526 void *firstp, void *lastp, int *countp)
528 return file->ops->lookup_set(file, name, firstp, lastp, countp);
532 linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr)
535 linker_symval_t symval;
537 size_t common_size = 0;
540 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
543 if (file->ops->lookup_symbol(file, name, &sym) == 0) {
544 file->ops->symbol_values(file, sym, &symval);
547 * XXX Assume a common symbol if its value is 0 and it has a non-zero
548 * size, otherwise it could be an absolute symbol with a value of 0.
550 if (symval.value == 0 && symval.size != 0) {
552 * For commons, first look them up in the dependancies and
553 * only allocate space if not found there.
555 common_size = symval.size;
557 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
558 *raddr = symval.value;
563 for (i = 0; i < file->ndeps; i++) {
564 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) {
565 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", *raddr));
570 /* If we have not found it in the dependencies, search globally */
571 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
572 /* But skip the current file if it's on the list */
575 /* And skip the files we searched above */
576 for (i = 0; i < file->ndeps; i++)
577 if (lf == file->deps[i])
581 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) {
582 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", *raddr));
588 if (common_size > 0) {
590 * This is a common symbol which was not found in the
591 * dependancies. We maintain a simple common symbol table in
594 struct common_symbol* cp;
596 for (cp = STAILQ_FIRST(&file->common); cp;
597 cp = STAILQ_NEXT(cp, link))
598 if (!strcmp(cp->name, name)) {
599 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
600 *raddr = cp->address;
605 * Round the symbol size up to align.
607 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
608 cp = kmalloc(sizeof(struct common_symbol)
613 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
616 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
618 cp->address = (caddr_t) (cp + 1);
619 cp->name = cp->address + common_size;
620 strcpy(cp->name, name);
621 bzero(cp->address, common_size);
622 STAILQ_INSERT_TAIL(&file->common, cp, link);
624 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
625 *raddr = cp->address;
629 #ifdef _KERNEL_VIRTUAL
630 *raddr = dlsym(RTLD_NEXT, name);
631 if (*raddr != NULL) {
632 KLD_DPF(SYM, ("linker_file_lookup_symbol: found dlsym=%x\n", *raddr));
637 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
643 * DDB Helpers. DDB has to look across multiple files with their own
644 * symbol tables and string tables.
646 * Note that we do not obey list locking protocols here. We really don't
647 * need DDB to hang because somebody's got the lock held. We'll take the
648 * chance that the files list is inconsistant instead.
652 linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
656 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
657 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0)
664 linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
667 u_long off = (uintptr_t)value;
668 u_long diff, bestdiff;
674 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
675 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0)
677 if (es != 0 && diff < bestdiff) {
696 linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
700 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
701 if (lf->ops->symbol_values(lf, sym, symval) == 0)
714 sys_kldload(struct kldload_args *uap)
716 struct thread *td = curthread;
717 char* filename = NULL, *modulename;
721 uap->sysmsg_result = -1;
723 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */
726 if ((error = suser(td)) != 0)
729 filename = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
730 if ((error = copyinstr(uap->file, filename, MAXPATHLEN, NULL)) != 0)
733 /* Can't load more than one module with the same name */
734 modulename = rindex(filename, '/');
735 if (modulename == NULL)
736 modulename = filename;
739 if (linker_find_file_by_name(modulename)) {
744 if ((error = linker_load_file(filename, &lf)) != 0)
748 uap->sysmsg_result = lf->id;
752 kfree(filename, M_TEMP);
757 sys_kldunload(struct kldunload_args *uap)
759 struct thread *td = curthread;
763 if (securelevel > 0 || kernel_mem_readonly) /* redundant, but that's OK */
766 if ((error = suser(td)) != 0)
769 lf = linker_find_file_by_id(uap->fileid);
771 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
772 if (lf->userrefs == 0) {
773 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n");
778 error = linker_file_unload(lf);
789 sys_kldfind(struct kldfind_args *uap)
791 char *filename = NULL, *modulename;
795 uap->sysmsg_result = -1;
797 filename = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
798 if ((error = copyinstr(uap->file, filename, MAXPATHLEN, NULL)) != 0)
801 modulename = rindex(filename, '/');
802 if (modulename == NULL)
803 modulename = filename;
805 lf = linker_find_file_by_name(modulename);
807 uap->sysmsg_result = lf->id;
813 kfree(filename, M_TEMP);
818 sys_kldnext(struct kldnext_args *uap)
823 if (uap->fileid == 0) {
824 if (TAILQ_FIRST(&linker_files))
825 uap->sysmsg_result = TAILQ_FIRST(&linker_files)->id;
827 uap->sysmsg_result = 0;
831 lf = linker_find_file_by_id(uap->fileid);
833 if (TAILQ_NEXT(lf, link))
834 uap->sysmsg_result = TAILQ_NEXT(lf, link)->id;
836 uap->sysmsg_result = 0;
844 sys_kldstat(struct kldstat_args *uap)
849 struct kld_file_stat* stat;
852 lf = linker_find_file_by_id(uap->fileid);
861 * Check the version of the user's structure.
863 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
865 if (version != sizeof(struct kld_file_stat)) {
870 namelen = strlen(lf->filename) + 1;
871 if (namelen > MAXPATHLEN)
872 namelen = MAXPATHLEN;
873 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
875 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
877 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
879 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0)
881 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
884 uap->sysmsg_result = 0;
891 sys_kldfirstmod(struct kldfirstmod_args *uap)
896 lf = linker_find_file_by_id(uap->fileid);
898 if (TAILQ_FIRST(&lf->modules))
899 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules));
901 uap->sysmsg_result = 0;
909 sys_kldsym(struct kldsym_args *uap)
913 linker_symval_t symval;
915 struct kld_sym_lookup lookup;
918 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
920 if (lookup.version != sizeof(lookup) || uap->cmd != KLDSYM_LOOKUP) {
925 symstr = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
926 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
929 if (uap->fileid != 0) {
930 lf = linker_find_file_by_id(uap->fileid);
935 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
936 lf->ops->symbol_values(lf, sym, &symval) == 0) {
937 lookup.symvalue = (uintptr_t)symval.value;
938 lookup.symsize = symval.size;
939 error = copyout(&lookup, uap->data, sizeof(lookup));
943 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
944 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
945 lf->ops->symbol_values(lf, sym, &symval) == 0) {
946 lookup.symvalue = (uintptr_t)symval.value;
947 lookup.symsize = symval.size;
948 error = copyout(&lookup, uap->data, sizeof(lookup));
957 kfree(symstr, M_TEMP);
962 * Look for module metadata in the static kernel
964 struct mod_metadata *
965 find_mod_metadata(const char *modname)
968 struct mod_metadata **mdp;
969 struct mod_metadata *mdt;
972 * Strip path prefixes and any dot extension. MDT_MODULE names
973 * are just the module name without a path or ".ko".
975 for (len = strlen(modname) - 1; len >= 0; --len) {
976 if (modname[len] == '/')
980 for (len = 0; modname[len] && modname[len] != '.'; ++len)
984 * Look for the module declaration
986 SET_FOREACH(mdp, modmetadata_set) {
988 if (mdt->md_type != MDT_MODULE)
990 if (strlen(mdt->md_cval) == len &&
991 strncmp(mdt->md_cval, modname, len) == 0) {
999 * Preloaded module support
1002 linker_preload(void* arg)
1010 struct sysinit **sipp;
1011 const moduledata_t *moddata;
1012 struct sysinit **si_start, **si_stop;
1015 while ((modptr = preload_search_next_name(modptr)) != NULL) {
1016 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
1017 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
1018 if (modname == NULL) {
1019 kprintf("Preloaded module at %p does not have a name!\n", modptr);
1022 if (modtype == NULL) {
1023 kprintf("Preloaded module at %p does not have a type!\n", modptr);
1028 * This is a hack at the moment, but what's in FreeBSD-5 is even
1029 * worse so I'd rather the hack.
1031 kprintf("Preloaded %s \"%s\" at %p", modtype, modname, modptr);
1032 if (find_mod_metadata(modname)) {
1033 kprintf(" (ignored, already in static kernel)\n");
1038 lf = linker_find_file_by_name(modname);
1045 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
1046 error = lc->ops->load_file(modname, &lf);
1055 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) {
1057 * This is to set the sysinit moduledata so that the module
1058 * can attach itself to the correct containing file.
1059 * The sysinit could be run at *any* time.
1061 for (sipp = si_start; sipp < si_stop; sipp++) {
1062 if ((*sipp)->func == module_register_init) {
1063 moddata = (*sipp)->udata;
1064 error = module_register(moddata, lf);
1066 kprintf("Preloaded %s \"%s\" failed to register: %d\n",
1067 modtype, modname, error);
1070 sysinit_add(si_start, si_stop);
1072 linker_file_register_sysctls(lf);
1077 SYSINIT(preload, SI_BOOT2_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1080 * Search for a not-loaded module by name.
1082 * Modules may be found in the following locations:
1084 * - preloaded (result is just the module name)
1085 * - on disk (result is full path to module)
1087 * If the module name is qualified in any way (contains path, etc.)
1088 * the we simply return a copy of it.
1090 * The search path can be manipulated via sysctl. Note that we use the ';'
1091 * character as a separator to be consistent with the bootloader.
1094 static char linker_path[MAXPATHLEN] = "/;/boot;/modules";
1096 SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1097 sizeof(linker_path), "module load search path");
1098 TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
1101 linker_strdup(const char *str)
1105 if ((result = kmalloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
1106 strcpy(result, str);
1111 linker_search_path(const char *name)
1113 struct nlookupdata nd;
1114 char *cp, *ep, *result;
1115 size_t name_len, prefix_len;
1120 /* qualified at all? */
1121 if (index(name, '/'))
1122 return(linker_strdup(name));
1124 /* traverse the linker path */
1126 name_len = strlen(name);
1129 /* find the end of this component */
1130 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++)
1132 prefix_len = ep - cp;
1133 /* if this component doesn't end with a slash, add one */
1134 if (ep == cp || *(ep - 1) != '/')
1140 * +2 : possible separator, plus terminator.
1142 result = kmalloc(prefix_len + name_len + 2, M_LINKER, M_WAITOK);
1144 strncpy(result, cp, prefix_len);
1146 result[prefix_len++] = '/';
1147 strcpy(result + prefix_len, name);
1150 * Attempt to open the file, and return the path if we succeed and it's
1153 error = nlookup_init(&nd, result, UIO_SYSSPACE, NLC_FOLLOW|NLC_LOCKVP);
1155 error = vn_open(&nd, NULL, FREAD, 0);
1157 type = nd.nl_open_vp->v_type;
1164 kfree(result, M_LINKER);