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 1.39 2007/11/19 18:49:06 swildner 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 can recognize this
307 error
= ENOENT
; /* Nothing found */
312 kfree(koname
, M_LINKER
);
317 linker_find_file_by_name(const char* filename
)
319 linker_file_t lf
= 0;
323 for (i
= strlen(filename
); i
> 0 && filename
[i
-1] != '/'; --i
)
327 koname
= kmalloc(strlen(filename
) + 4, M_LINKER
, M_WAITOK
);
330 ksprintf(koname
, "%s.ko", filename
);
332 lockmgr(&lock
, LK_SHARED
);
333 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
334 if (!strcmp(lf
->filename
, koname
))
336 if (!strcmp(lf
->filename
, filename
))
339 lockmgr(&lock
, LK_RELEASE
);
343 kfree(koname
, M_LINKER
);
348 linker_find_file_by_id(int fileid
)
350 linker_file_t lf
= 0;
352 lockmgr(&lock
, LK_SHARED
);
353 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
))
354 if (lf
->id
== fileid
)
356 lockmgr(&lock
, LK_RELEASE
);
362 linker_make_file(const char* pathname
, void* priv
, struct linker_file_ops
* ops
)
364 linker_file_t lf
= 0;
366 const char *filename
;
368 filename
= rindex(pathname
, '/');
369 if (filename
&& filename
[1])
374 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename
));
375 lockmgr(&lock
, LK_EXCLUSIVE
);
376 namelen
= strlen(filename
) + 1;
377 lf
= kmalloc(sizeof(struct linker_file
) + namelen
, M_LINKER
, M_WAITOK
);
380 bzero(lf
, sizeof(*lf
));
385 lf
->filename
= (char*) (lf
+ 1);
386 strcpy(lf
->filename
, filename
);
387 lf
->id
= next_file_id
++;
390 STAILQ_INIT(&lf
->common
);
391 TAILQ_INIT(&lf
->modules
);
395 TAILQ_INSERT_TAIL(&linker_files
, lf
, link
);
398 lockmgr(&lock
, LK_RELEASE
);
403 linker_file_unload(linker_file_t file
)
406 struct common_symbol
* cp
;
410 /* Refuse to unload modules if securelevel raised */
411 if (securelevel
> 0 || kernel_mem_readonly
)
414 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file
->refs
));
415 lockmgr(&lock
, LK_EXCLUSIVE
);
416 if (file
->refs
== 1) {
417 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
419 * Temporarily bump file->refs to prevent recursive unloading
424 * Inform any modules associated with this file.
426 mod
= TAILQ_FIRST(&file
->modules
);
429 * Give the module a chance to veto the unload. Note that the
430 * act of unloading the module may cause other modules in the
431 * same file list to be unloaded recursively.
433 if ((error
= module_unload(mod
)) != 0) {
434 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
436 lockmgr(&lock
, LK_RELEASE
);
442 * Recursive relationships may prevent the release from
443 * immediately removing the module, or may remove other
444 * modules in the list.
446 next
= module_getfnext(mod
);
452 * Since we intend to destroy the file structure, we expect all
453 * modules to have been removed by now.
455 for (mod
= TAILQ_FIRST(&file
->modules
);
457 mod
= module_getfnext(mod
)
459 kprintf("linker_file_unload: module %p still has refs!\n", mod
);
465 if (file
->refs
> 0) {
466 lockmgr(&lock
, LK_RELEASE
);
470 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
471 if (file
->flags
& LINKER_FILE_LINKED
) {
472 linker_file_sysuninit(file
);
473 linker_file_unregister_sysctls(file
);
476 TAILQ_REMOVE(&linker_files
, file
, link
);
477 lockmgr(&lock
, LK_RELEASE
);
479 for (i
= 0; i
< file
->ndeps
; i
++)
480 linker_file_unload(file
->deps
[i
]);
481 kfree(file
->deps
, M_LINKER
);
483 for (cp
= STAILQ_FIRST(&file
->common
); cp
;
484 cp
= STAILQ_FIRST(&file
->common
)) {
485 STAILQ_REMOVE(&file
->common
, cp
, common_symbol
, link
);
489 file
->ops
->unload(file
);
490 kfree(file
, M_LINKER
);
497 linker_file_add_dependancy(linker_file_t file
, linker_file_t dep
)
499 linker_file_t
* newdeps
;
501 newdeps
= kmalloc((file
->ndeps
+ 1) * sizeof(linker_file_t
*),
505 bzero(newdeps
, (file
->ndeps
+ 1) * sizeof(linker_file_t
*));
508 bcopy(file
->deps
, newdeps
, file
->ndeps
* sizeof(linker_file_t
*));
509 kfree(file
->deps
, M_LINKER
);
511 file
->deps
= newdeps
;
512 file
->deps
[file
->ndeps
] = dep
;
519 * Locate a linker set and its contents.
520 * This is a helper function to avoid linker_if.h exposure elsewhere.
521 * Note: firstp and lastp are really void ***
524 linker_file_lookup_set(linker_file_t file
, const char *name
,
525 void *firstp
, void *lastp
, int *countp
)
527 return file
->ops
->lookup_set(file
, name
, firstp
, lastp
, countp
);
531 linker_file_lookup_symbol(linker_file_t file
, const char* name
, int deps
, caddr_t
*raddr
)
534 linker_symval_t symval
;
536 size_t common_size
= 0;
539 KLD_DPF(SYM
, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
542 if (file
->ops
->lookup_symbol(file
, name
, &sym
) == 0) {
543 file
->ops
->symbol_values(file
, sym
, &symval
);
546 * XXX Assume a common symbol if its value is 0 and it has a non-zero
547 * size, otherwise it could be an absolute symbol with a value of 0.
549 if (symval
.value
== 0 && symval
.size
!= 0) {
551 * For commons, first look them up in the dependancies and
552 * only allocate space if not found there.
554 common_size
= symval
.size
;
556 KLD_DPF(SYM
, ("linker_file_lookup_symbol: symbol.value=%x\n", symval
.value
));
557 *raddr
= symval
.value
;
562 for (i
= 0; i
< file
->ndeps
; i
++) {
563 if (linker_file_lookup_symbol(file
->deps
[i
], name
, 0, raddr
) == 0) {
564 KLD_DPF(SYM
, ("linker_file_lookup_symbol: deps value=%x\n", *raddr
));
569 /* If we have not found it in the dependencies, search globally */
570 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
571 /* But skip the current file if it's on the list */
574 /* And skip the files we searched above */
575 for (i
= 0; i
< file
->ndeps
; i
++)
576 if (lf
== file
->deps
[i
])
580 if (linker_file_lookup_symbol(lf
, name
, 0, raddr
) == 0) {
581 KLD_DPF(SYM
, ("linker_file_lookup_symbol: global value=%x\n", *raddr
));
587 if (common_size
> 0) {
589 * This is a common symbol which was not found in the
590 * dependancies. We maintain a simple common symbol table in
593 struct common_symbol
* cp
;
595 for (cp
= STAILQ_FIRST(&file
->common
); cp
;
596 cp
= STAILQ_NEXT(cp
, link
))
597 if (!strcmp(cp
->name
, name
)) {
598 KLD_DPF(SYM
, ("linker_file_lookup_symbol: old common value=%x\n", cp
->address
));
599 *raddr
= cp
->address
;
604 * Round the symbol size up to align.
606 common_size
= (common_size
+ sizeof(int) - 1) & -sizeof(int);
607 cp
= kmalloc(sizeof(struct common_symbol
)
612 KLD_DPF(SYM
, ("linker_file_lookup_symbol: nomem\n"));
615 bzero(cp
, sizeof(struct common_symbol
) + common_size
+ strlen(name
)+ 1);
617 cp
->address
= (caddr_t
) (cp
+ 1);
618 cp
->name
= cp
->address
+ common_size
;
619 strcpy(cp
->name
, name
);
620 bzero(cp
->address
, common_size
);
621 STAILQ_INSERT_TAIL(&file
->common
, cp
, link
);
623 KLD_DPF(SYM
, ("linker_file_lookup_symbol: new common value=%x\n", cp
->address
));
624 *raddr
= cp
->address
;
628 #ifdef _KERNEL_VIRTUAL
629 *raddr
= dlsym(RTLD_NEXT
, name
);
630 if (*raddr
!= NULL
) {
631 KLD_DPF(SYM
, ("linker_file_lookup_symbol: found dlsym=%x\n", *raddr
));
636 KLD_DPF(SYM
, ("linker_file_lookup_symbol: fail\n"));
642 * DDB Helpers. DDB has to look across multiple files with their own
643 * symbol tables and string tables.
645 * Note that we do not obey list locking protocols here. We really don't
646 * need DDB to hang because somebody's got the lock held. We'll take the
647 * chance that the files list is inconsistant instead.
651 linker_ddb_lookup(const char *symstr
, c_linker_sym_t
*sym
)
655 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
656 if (lf
->ops
->lookup_symbol(lf
, symstr
, sym
) == 0)
663 linker_ddb_search_symbol(caddr_t value
, c_linker_sym_t
*sym
, long *diffp
)
666 u_long off
= (uintptr_t)value
;
667 u_long diff
, bestdiff
;
673 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
674 if (lf
->ops
->search_symbol(lf
, value
, &es
, &diff
) != 0)
676 if (es
!= 0 && diff
< bestdiff
) {
695 linker_ddb_symbol_values(c_linker_sym_t sym
, linker_symval_t
*symval
)
699 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
700 if (lf
->ops
->symbol_values(lf
, sym
, symval
) == 0)
713 sys_kldload(struct kldload_args
*uap
)
715 struct thread
*td
= curthread
;
716 char* filename
= NULL
, *modulename
;
720 uap
->sysmsg_result
= -1;
722 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
725 if ((error
= suser(td
)) != 0)
728 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
729 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
732 /* Can't load more than one module with the same name */
733 modulename
= rindex(filename
, '/');
734 if (modulename
== NULL
)
735 modulename
= filename
;
738 if (linker_find_file_by_name(modulename
)) {
743 if ((error
= linker_load_file(filename
, &lf
)) != 0)
747 uap
->sysmsg_result
= lf
->id
;
751 kfree(filename
, M_TEMP
);
756 sys_kldunload(struct kldunload_args
*uap
)
758 struct thread
*td
= curthread
;
762 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
765 if ((error
= suser(td
)) != 0)
768 lf
= linker_find_file_by_id(uap
->fileid
);
770 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf
->userrefs
));
771 if (lf
->userrefs
== 0) {
772 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n");
777 error
= linker_file_unload(lf
);
788 sys_kldfind(struct kldfind_args
*uap
)
790 char *filename
= NULL
, *modulename
;
794 uap
->sysmsg_result
= -1;
796 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
797 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
800 modulename
= rindex(filename
, '/');
801 if (modulename
== NULL
)
802 modulename
= filename
;
804 lf
= linker_find_file_by_name(modulename
);
806 uap
->sysmsg_result
= lf
->id
;
812 kfree(filename
, M_TEMP
);
817 sys_kldnext(struct kldnext_args
*uap
)
822 if (uap
->fileid
== 0) {
823 if (TAILQ_FIRST(&linker_files
))
824 uap
->sysmsg_result
= TAILQ_FIRST(&linker_files
)->id
;
826 uap
->sysmsg_result
= 0;
830 lf
= linker_find_file_by_id(uap
->fileid
);
832 if (TAILQ_NEXT(lf
, link
))
833 uap
->sysmsg_result
= TAILQ_NEXT(lf
, link
)->id
;
835 uap
->sysmsg_result
= 0;
843 sys_kldstat(struct kldstat_args
*uap
)
848 struct kld_file_stat
* stat
;
851 lf
= linker_find_file_by_id(uap
->fileid
);
860 * Check the version of the user's structure.
862 if ((error
= copyin(&stat
->version
, &version
, sizeof(version
))) != 0)
864 if (version
!= sizeof(struct kld_file_stat
)) {
869 namelen
= strlen(lf
->filename
) + 1;
870 if (namelen
> MAXPATHLEN
)
871 namelen
= MAXPATHLEN
;
872 if ((error
= copyout(lf
->filename
, &stat
->name
[0], namelen
)) != 0)
874 if ((error
= copyout(&lf
->refs
, &stat
->refs
, sizeof(int))) != 0)
876 if ((error
= copyout(&lf
->id
, &stat
->id
, sizeof(int))) != 0)
878 if ((error
= copyout(&lf
->address
, &stat
->address
, sizeof(caddr_t
))) != 0)
880 if ((error
= copyout(&lf
->size
, &stat
->size
, sizeof(size_t))) != 0)
883 uap
->sysmsg_result
= 0;
890 sys_kldfirstmod(struct kldfirstmod_args
*uap
)
895 lf
= linker_find_file_by_id(uap
->fileid
);
897 if (TAILQ_FIRST(&lf
->modules
))
898 uap
->sysmsg_result
= module_getid(TAILQ_FIRST(&lf
->modules
));
900 uap
->sysmsg_result
= 0;
908 sys_kldsym(struct kldsym_args
*uap
)
912 linker_symval_t symval
;
914 struct kld_sym_lookup lookup
;
917 if ((error
= copyin(uap
->data
, &lookup
, sizeof(lookup
))) != 0)
919 if (lookup
.version
!= sizeof(lookup
) || uap
->cmd
!= KLDSYM_LOOKUP
) {
924 symstr
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
925 if ((error
= copyinstr(lookup
.symname
, symstr
, MAXPATHLEN
, NULL
)) != 0)
928 if (uap
->fileid
!= 0) {
929 lf
= linker_find_file_by_id(uap
->fileid
);
934 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
935 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
936 lookup
.symvalue
= (uintptr_t)symval
.value
;
937 lookup
.symsize
= symval
.size
;
938 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
942 for (lf
= TAILQ_FIRST(&linker_files
); lf
; lf
= TAILQ_NEXT(lf
, link
)) {
943 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
944 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
945 lookup
.symvalue
= (uintptr_t)symval
.value
;
946 lookup
.symsize
= symval
.size
;
947 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
956 kfree(symstr
, M_TEMP
);
961 * Look for module metadata in the static kernel
963 struct mod_metadata
*
964 find_mod_metadata(const char *modname
)
967 struct mod_metadata
**mdp
;
968 struct mod_metadata
*mdt
;
971 * Strip path prefixes and any dot extension. MDT_MODULE names
972 * are just the module name without a path or ".ko".
974 for (len
= strlen(modname
) - 1; len
>= 0; --len
) {
975 if (modname
[len
] == '/')
979 for (len
= 0; modname
[len
] && modname
[len
] != '.'; ++len
)
983 * Look for the module declaration
985 SET_FOREACH(mdp
, modmetadata_set
) {
987 if (mdt
->md_type
!= MDT_MODULE
)
989 if (strlen(mdt
->md_cval
) == len
&&
990 strncmp(mdt
->md_cval
, modname
, len
) == 0) {
998 * Preloaded module support
1001 linker_preload(void* arg
)
1009 struct sysinit
**sipp
;
1010 const moduledata_t
*moddata
;
1011 struct sysinit
**si_start
, **si_stop
;
1014 while ((modptr
= preload_search_next_name(modptr
)) != NULL
) {
1015 modname
= (char *)preload_search_info(modptr
, MODINFO_NAME
);
1016 modtype
= (char *)preload_search_info(modptr
, MODINFO_TYPE
);
1017 if (modname
== NULL
) {
1018 kprintf("Preloaded module at %p does not have a name!\n", modptr
);
1021 if (modtype
== NULL
) {
1022 kprintf("Preloaded module at %p does not have a type!\n", modptr
);
1027 * This is a hack at the moment, but what's in FreeBSD-5 is even
1028 * worse so I'd rather the hack.
1030 kprintf("Preloaded %s \"%s\" at %p", modtype
, modname
, modptr
);
1031 if (find_mod_metadata(modname
)) {
1032 kprintf(" (ignored, already in static kernel)\n");
1037 lf
= linker_find_file_by_name(modname
);
1044 for (lc
= TAILQ_FIRST(&classes
); lc
; lc
= TAILQ_NEXT(lc
, link
)) {
1045 error
= lc
->ops
->load_file(modname
, &lf
);
1054 if (linker_file_lookup_set(lf
, "sysinit_set", &si_start
, &si_stop
, NULL
) == 0) {
1056 * This is to set the sysinit moduledata so that the module
1057 * can attach itself to the correct containing file.
1058 * The sysinit could be run at *any* time.
1060 for (sipp
= si_start
; sipp
< si_stop
; sipp
++) {
1061 if ((*sipp
)->func
== module_register_init
) {
1062 moddata
= (*sipp
)->udata
;
1063 error
= module_register(moddata
, lf
);
1065 kprintf("Preloaded %s \"%s\" failed to register: %d\n",
1066 modtype
, modname
, error
);
1069 sysinit_add(si_start
, si_stop
);
1071 linker_file_register_sysctls(lf
);
1076 SYSINIT(preload
, SI_BOOT2_KLD
, SI_ORDER_MIDDLE
, linker_preload
, 0);
1079 * Search for a not-loaded module by name.
1081 * Modules may be found in the following locations:
1083 * - preloaded (result is just the module name)
1084 * - on disk (result is full path to module)
1086 * If the module name is qualified in any way (contains path, etc.)
1087 * the we simply return a copy of it.
1089 * The search path can be manipulated via sysctl. Note that we use the ';'
1090 * character as a separator to be consistent with the bootloader.
1093 static char linker_path
[MAXPATHLEN
] = "/;/boot;/modules";
1095 SYSCTL_STRING(_kern
, OID_AUTO
, module_path
, CTLFLAG_RW
, linker_path
,
1096 sizeof(linker_path
), "module load search path");
1097 TUNABLE_STR("module_path", linker_path
, sizeof(linker_path
));
1100 linker_strdup(const char *str
)
1104 if ((result
= kmalloc((strlen(str
) + 1), M_LINKER
, M_WAITOK
)) != NULL
)
1105 strcpy(result
, str
);
1110 linker_search_path(const char *name
)
1112 struct nlookupdata nd
;
1113 char *cp
, *ep
, *result
;
1114 size_t name_len
, prefix_len
;
1119 /* qualified at all? */
1120 if (index(name
, '/'))
1121 return(linker_strdup(name
));
1123 /* traverse the linker path */
1125 name_len
= strlen(name
);
1128 /* find the end of this component */
1129 for (ep
= cp
; (*ep
!= 0) && (*ep
!= ';'); ep
++)
1131 prefix_len
= ep
- cp
;
1132 /* if this component doesn't end with a slash, add one */
1133 if (ep
== cp
|| *(ep
- 1) != '/')
1139 * +2 : possible separator, plus terminator.
1141 result
= kmalloc(prefix_len
+ name_len
+ 2, M_LINKER
, M_WAITOK
);
1143 strncpy(result
, cp
, prefix_len
);
1145 result
[prefix_len
++] = '/';
1146 strcpy(result
+ prefix_len
, name
);
1149 * Attempt to open the file, and return the path if we succeed and it's
1152 error
= nlookup_init(&nd
, result
, UIO_SYSSPACE
, NLC_FOLLOW
|NLC_LOCKVP
);
1154 error
= vn_open(&nd
, NULL
, FREAD
, 0);
1156 type
= nd
.nl_open_vp
->v_type
;
1163 kfree(result
, M_LINKER
);