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 1.37 2007/05/19 19:33:02 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/nlookup.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
, "klink", 0, 0);
71 TAILQ_INIT(&linker_files
);
74 SYSINIT(linker
, SI_BOOT2_KLD
, SI_ORDER_FIRST
, linker_init
, 0);
77 linker_add_class(const char* desc
, void* priv
,
78 struct linker_class_ops
* ops
)
82 lc
= kmalloc(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 kprintf("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_SPECIAL_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_SPECIAL_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 */
242 if (securelevel
> 0 || kernel_mem_readonly
)
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
= kmalloc(strlen(filename
) + 4, M_LINKER
, M_WAITOK
);
260 if (koname
== NULL
) {
264 ksprintf(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 kfree(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
= kmalloc(strlen(filename
) + 4, M_LINKER
, M_WAITOK
);
327 ksprintf(koname
, "%s.ko", filename
);
329 lockmgr(&lock
, LK_SHARED
);
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
);
340 kfree(koname
, M_LINKER
);
345 linker_find_file_by_id(int fileid
)
347 linker_file_t lf
= 0;
349 lockmgr(&lock
, LK_SHARED
);
350 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
))
351 if (lf
->id
== fileid
)
353 lockmgr(&lock
, LK_RELEASE
);
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
);
373 namelen
= strlen(filename
) + 1;
374 lf
= kmalloc(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
);
400 linker_file_unload(linker_file_t file
)
403 struct common_symbol
* cp
;
407 /* Refuse to unload modules if securelevel raised */
408 if (securelevel
> 0 || kernel_mem_readonly
)
411 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file
->refs
));
412 lockmgr(&lock
, LK_EXCLUSIVE
);
413 if (file
->refs
== 1) {
414 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
416 * Temporarily bump file->refs to prevent recursive unloading
421 * Inform any modules associated with this file.
423 mod
= TAILQ_FIRST(&file
->modules
);
426 * Give the module a chance to veto the unload. Note that the
427 * act of unloading the module may cause other modules in the
428 * same file list to be unloaded recursively.
430 if ((error
= module_unload(mod
)) != 0) {
431 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
433 lockmgr(&lock
, LK_RELEASE
);
439 * Recursive relationships may prevent the release from
440 * immediately removing the module, or may remove other
441 * modules in the list.
443 next
= module_getfnext(mod
);
449 * Since we intend to destroy the file structure, we expect all
450 * modules to have been removed by now.
452 for (mod
= TAILQ_FIRST(&file
->modules
);
454 mod
= module_getfnext(mod
)
456 kprintf("linker_file_unload: module %p still has refs!\n", mod
);
462 if (file
->refs
> 0) {
463 lockmgr(&lock
, LK_RELEASE
);
467 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
468 if (file
->flags
& LINKER_FILE_LINKED
) {
469 linker_file_sysuninit(file
);
470 linker_file_unregister_sysctls(file
);
473 TAILQ_REMOVE(&linker_files
, file
, link
);
474 lockmgr(&lock
, LK_RELEASE
);
476 for (i
= 0; i
< file
->ndeps
; i
++)
477 linker_file_unload(file
->deps
[i
]);
478 kfree(file
->deps
, M_LINKER
);
480 for (cp
= STAILQ_FIRST(&file
->common
); cp
;
481 cp
= STAILQ_FIRST(&file
->common
)) {
482 STAILQ_REMOVE(&file
->common
, cp
, common_symbol
, link
);
486 file
->ops
->unload(file
);
487 kfree(file
, M_LINKER
);
494 linker_file_add_dependancy(linker_file_t file
, linker_file_t dep
)
496 linker_file_t
* newdeps
;
498 newdeps
= kmalloc((file
->ndeps
+ 1) * sizeof(linker_file_t
*),
502 bzero(newdeps
, (file
->ndeps
+ 1) * sizeof(linker_file_t
*));
505 bcopy(file
->deps
, newdeps
, file
->ndeps
* sizeof(linker_file_t
*));
506 kfree(file
->deps
, M_LINKER
);
508 file
->deps
= newdeps
;
509 file
->deps
[file
->ndeps
] = dep
;
516 * Locate a linker set and its contents.
517 * This is a helper function to avoid linker_if.h exposure elsewhere.
518 * Note: firstp and lastp are really void ***
521 linker_file_lookup_set(linker_file_t file
, const char *name
,
522 void *firstp
, void *lastp
, int *countp
)
524 return file
->ops
->lookup_set(file
, name
, firstp
, lastp
, countp
);
528 linker_file_lookup_symbol(linker_file_t file
, const char* name
, int deps
, caddr_t
*raddr
)
531 linker_symval_t symval
;
533 size_t common_size
= 0;
536 KLD_DPF(SYM
, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
539 if (file
->ops
->lookup_symbol(file
, name
, &sym
) == 0) {
540 file
->ops
->symbol_values(file
, sym
, &symval
);
543 * XXX Assume a common symbol if its value is 0 and it has a non-zero
544 * size, otherwise it could be an absolute symbol with a value of 0.
546 if (symval
.value
== 0 && symval
.size
!= 0) {
548 * For commons, first look them up in the dependancies and
549 * only allocate space if not found there.
551 common_size
= symval
.size
;
553 KLD_DPF(SYM
, ("linker_file_lookup_symbol: symbol.value=%x\n", symval
.value
));
554 *raddr
= symval
.value
;
559 for (i
= 0; i
< file
->ndeps
; i
++) {
560 if (linker_file_lookup_symbol(file
->deps
[i
], name
, 0, raddr
) == 0) {
561 KLD_DPF(SYM
, ("linker_file_lookup_symbol: deps value=%x\n", *raddr
));
566 /* If we have not found it in the dependencies, search globally */
567 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
568 /* But skip the current file if it's on the list */
571 /* And skip the files we searched above */
572 for (i
= 0; i
< file
->ndeps
; i
++)
573 if (lf
== file
->deps
[i
])
577 if (linker_file_lookup_symbol(lf
, name
, 0, raddr
) == 0) {
578 KLD_DPF(SYM
, ("linker_file_lookup_symbol: global value=%x\n", *raddr
));
584 if (common_size
> 0) {
586 * This is a common symbol which was not found in the
587 * dependancies. We maintain a simple common symbol table in
590 struct common_symbol
* cp
;
592 for (cp
= STAILQ_FIRST(&file
->common
); cp
;
593 cp
= STAILQ_NEXT(cp
, link
))
594 if (!strcmp(cp
->name
, name
)) {
595 KLD_DPF(SYM
, ("linker_file_lookup_symbol: old common value=%x\n", cp
->address
));
596 *raddr
= cp
->address
;
601 * Round the symbol size up to align.
603 common_size
= (common_size
+ sizeof(int) - 1) & -sizeof(int);
604 cp
= kmalloc(sizeof(struct common_symbol
)
609 KLD_DPF(SYM
, ("linker_file_lookup_symbol: nomem\n"));
612 bzero(cp
, sizeof(struct common_symbol
) + common_size
+ strlen(name
)+ 1);
614 cp
->address
= (caddr_t
) (cp
+ 1);
615 cp
->name
= cp
->address
+ common_size
;
616 strcpy(cp
->name
, name
);
617 bzero(cp
->address
, common_size
);
618 STAILQ_INSERT_TAIL(&file
->common
, cp
, link
);
620 KLD_DPF(SYM
, ("linker_file_lookup_symbol: new common value=%x\n", cp
->address
));
621 *raddr
= cp
->address
;
625 KLD_DPF(SYM
, ("linker_file_lookup_symbol: fail\n"));
631 * DDB Helpers. DDB has to look across multiple files with their own
632 * symbol tables and string tables.
634 * Note that we do not obey list locking protocols here. We really don't
635 * need DDB to hang because somebody's got the lock held. We'll take the
636 * chance that the files list is inconsistant instead.
640 linker_ddb_lookup(const char *symstr
, c_linker_sym_t
*sym
)
644 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
645 if (lf
->ops
->lookup_symbol(lf
, symstr
, sym
) == 0)
652 linker_ddb_search_symbol(caddr_t value
, c_linker_sym_t
*sym
, long *diffp
)
655 u_long off
= (uintptr_t)value
;
656 u_long diff
, bestdiff
;
662 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
663 if (lf
->ops
->search_symbol(lf
, value
, &es
, &diff
) != 0)
665 if (es
!= 0 && diff
< bestdiff
) {
684 linker_ddb_symbol_values(c_linker_sym_t sym
, linker_symval_t
*symval
)
688 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
689 if (lf
->ops
->symbol_values(lf
, sym
, symval
) == 0)
702 sys_kldload(struct kldload_args
*uap
)
704 struct thread
*td
= curthread
;
705 char* filename
= NULL
, *modulename
;
709 uap
->sysmsg_result
= -1;
711 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
714 if ((error
= suser(td
)) != 0)
717 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
718 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
721 /* Can't load more than one module with the same name */
722 modulename
= rindex(filename
, '/');
723 if (modulename
== NULL
)
724 modulename
= filename
;
727 if (linker_find_file_by_name(modulename
)) {
732 if ((error
= linker_load_file(filename
, &lf
)) != 0)
736 uap
->sysmsg_result
= lf
->id
;
740 kfree(filename
, M_TEMP
);
745 sys_kldunload(struct kldunload_args
*uap
)
747 struct thread
*td
= curthread
;
751 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
754 if ((error
= suser(td
)) != 0)
757 lf
= linker_find_file_by_id(uap
->fileid
);
759 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf
->userrefs
));
760 if (lf
->userrefs
== 0) {
761 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n");
766 error
= linker_file_unload(lf
);
777 sys_kldfind(struct kldfind_args
*uap
)
779 char *filename
= NULL
, *modulename
;
783 uap
->sysmsg_result
= -1;
785 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
786 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
789 modulename
= rindex(filename
, '/');
790 if (modulename
== NULL
)
791 modulename
= filename
;
793 lf
= linker_find_file_by_name(modulename
);
795 uap
->sysmsg_result
= lf
->id
;
801 kfree(filename
, M_TEMP
);
806 sys_kldnext(struct kldnext_args
*uap
)
811 if (uap
->fileid
== 0) {
812 if (TAILQ_FIRST(&linker_files
))
813 uap
->sysmsg_result
= TAILQ_FIRST(&linker_files
)->id
;
815 uap
->sysmsg_result
= 0;
819 lf
= linker_find_file_by_id(uap
->fileid
);
821 if (TAILQ_NEXT(lf
, link
))
822 uap
->sysmsg_result
= TAILQ_NEXT(lf
, link
)->id
;
824 uap
->sysmsg_result
= 0;
832 sys_kldstat(struct kldstat_args
*uap
)
837 struct kld_file_stat
* stat
;
840 lf
= linker_find_file_by_id(uap
->fileid
);
849 * Check the version of the user's structure.
851 if ((error
= copyin(&stat
->version
, &version
, sizeof(version
))) != 0)
853 if (version
!= sizeof(struct kld_file_stat
)) {
858 namelen
= strlen(lf
->filename
) + 1;
859 if (namelen
> MAXPATHLEN
)
860 namelen
= MAXPATHLEN
;
861 if ((error
= copyout(lf
->filename
, &stat
->name
[0], namelen
)) != 0)
863 if ((error
= copyout(&lf
->refs
, &stat
->refs
, sizeof(int))) != 0)
865 if ((error
= copyout(&lf
->id
, &stat
->id
, sizeof(int))) != 0)
867 if ((error
= copyout(&lf
->address
, &stat
->address
, sizeof(caddr_t
))) != 0)
869 if ((error
= copyout(&lf
->size
, &stat
->size
, sizeof(size_t))) != 0)
872 uap
->sysmsg_result
= 0;
879 sys_kldfirstmod(struct kldfirstmod_args
*uap
)
884 lf
= linker_find_file_by_id(uap
->fileid
);
886 if (TAILQ_FIRST(&lf
->modules
))
887 uap
->sysmsg_result
= module_getid(TAILQ_FIRST(&lf
->modules
));
889 uap
->sysmsg_result
= 0;
897 sys_kldsym(struct kldsym_args
*uap
)
901 linker_symval_t symval
;
903 struct kld_sym_lookup lookup
;
906 if ((error
= copyin(uap
->data
, &lookup
, sizeof(lookup
))) != 0)
908 if (lookup
.version
!= sizeof(lookup
) || uap
->cmd
!= KLDSYM_LOOKUP
) {
913 symstr
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
914 if ((error
= copyinstr(lookup
.symname
, symstr
, MAXPATHLEN
, NULL
)) != 0)
917 if (uap
->fileid
!= 0) {
918 lf
= linker_find_file_by_id(uap
->fileid
);
923 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
924 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
925 lookup
.symvalue
= (uintptr_t)symval
.value
;
926 lookup
.symsize
= symval
.size
;
927 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
931 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
932 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
933 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
934 lookup
.symvalue
= (uintptr_t)symval
.value
;
935 lookup
.symsize
= symval
.size
;
936 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
945 kfree(symstr
, M_TEMP
);
950 * Look for module metadata in the static kernel
952 struct mod_metadata
*
953 find_mod_metadata(const char *modname
)
956 struct mod_metadata
**mdp
;
957 struct mod_metadata
*mdt
;
960 * Strip path prefixes and any dot extension. MDT_MODULE names
961 * are just the module name without a path or ".ko".
963 for (len
= strlen(modname
) - 1; len
>= 0; --len
) {
964 if (modname
[len
] == '/')
968 for (len
= 0; modname
[len
] && modname
[len
] != '.'; ++len
)
972 * Look for the module declaration
974 SET_FOREACH(mdp
, modmetadata_set
) {
976 if (mdt
->md_type
!= MDT_MODULE
)
978 if (strlen(mdt
->md_cval
) == len
&&
979 strncmp(mdt
->md_cval
, modname
, len
) == 0) {
987 * Preloaded module support
990 linker_preload(void* arg
)
998 struct sysinit
**sipp
;
999 const moduledata_t
*moddata
;
1000 struct sysinit
**si_start
, **si_stop
;
1003 while ((modptr
= preload_search_next_name(modptr
)) != NULL
) {
1004 modname
= (char *)preload_search_info(modptr
, MODINFO_NAME
);
1005 modtype
= (char *)preload_search_info(modptr
, MODINFO_TYPE
);
1006 if (modname
== NULL
) {
1007 kprintf("Preloaded module at %p does not have a name!\n", modptr
);
1010 if (modtype
== NULL
) {
1011 kprintf("Preloaded module at %p does not have a type!\n", modptr
);
1016 * This is a hack at the moment, but what's in FreeBSD-5 is even
1017 * worse so I'd rather the hack.
1019 kprintf("Preloaded %s \"%s\" at %p", modtype
, modname
, modptr
);
1020 if (find_mod_metadata(modname
)) {
1021 kprintf(" (ignored, already in static kernel)\n");
1026 lf
= linker_find_file_by_name(modname
);
1033 for (lc
= TAILQ_FIRST(&classes
); lc
; lc
= TAILQ_NEXT(lc
, link
)) {
1034 error
= lc
->ops
->load_file(modname
, &lf
);
1043 if (linker_file_lookup_set(lf
, "sysinit_set", &si_start
, &si_stop
, NULL
) == 0) {
1045 * This is to set the sysinit moduledata so that the module
1046 * can attach itself to the correct containing file.
1047 * The sysinit could be run at *any* time.
1049 for (sipp
= si_start
; sipp
< si_stop
; sipp
++) {
1050 if ((*sipp
)->func
== module_register_init
) {
1051 moddata
= (*sipp
)->udata
;
1052 error
= module_register(moddata
, lf
);
1054 kprintf("Preloaded %s \"%s\" failed to register: %d\n",
1055 modtype
, modname
, error
);
1058 sysinit_add(si_start
, si_stop
);
1060 linker_file_register_sysctls(lf
);
1065 SYSINIT(preload
, SI_BOOT2_KLD
, SI_ORDER_MIDDLE
, linker_preload
, 0);
1068 * Search for a not-loaded module by name.
1070 * Modules may be found in the following locations:
1072 * - preloaded (result is just the module name)
1073 * - on disk (result is full path to module)
1075 * If the module name is qualified in any way (contains path, etc.)
1076 * the we simply return a copy of it.
1078 * The search path can be manipulated via sysctl. Note that we use the ';'
1079 * character as a separator to be consistent with the bootloader.
1082 static char linker_path
[MAXPATHLEN
] = "/;/boot;/modules";
1084 SYSCTL_STRING(_kern
, OID_AUTO
, module_path
, CTLFLAG_RW
, linker_path
,
1085 sizeof(linker_path
), "module load search path");
1086 TUNABLE_STR("module_path", linker_path
, sizeof(linker_path
));
1089 linker_strdup(const char *str
)
1093 if ((result
= kmalloc((strlen(str
) + 1), M_LINKER
, M_WAITOK
)) != NULL
)
1094 strcpy(result
, str
);
1099 linker_search_path(const char *name
)
1101 struct nlookupdata nd
;
1102 char *cp
, *ep
, *result
;
1103 size_t name_len
, prefix_len
;
1108 /* qualified at all? */
1109 if (index(name
, '/'))
1110 return(linker_strdup(name
));
1112 /* traverse the linker path */
1114 name_len
= strlen(name
);
1117 /* find the end of this component */
1118 for (ep
= cp
; (*ep
!= 0) && (*ep
!= ';'); ep
++)
1120 prefix_len
= ep
- cp
;
1121 /* if this component doesn't end with a slash, add one */
1122 if (ep
== cp
|| *(ep
- 1) != '/')
1128 * +2 : possible separator, plus terminator.
1130 result
= kmalloc(prefix_len
+ name_len
+ 2, M_LINKER
, M_WAITOK
);
1132 strncpy(result
, cp
, prefix_len
);
1134 result
[prefix_len
++] = '/';
1135 strcpy(result
+ prefix_len
, name
);
1138 * Attempt to open the file, and return the path if we succeed and it's
1141 error
= nlookup_init(&nd
, result
, UIO_SYSSPACE
, NLC_FOLLOW
|NLC_LOCKVP
);
1143 error
= vn_open(&nd
, NULL
, FREAD
, 0);
1145 type
= nd
.nl_open_vp
->v_type
;
1152 kfree(result
, M_LINKER
);