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 1.43 2008/02/06 22:37:46 nth 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/queue.h>
42 #include <sys/linker.h>
43 #include <sys/fcntl.h>
44 #include <sys/libkern.h>
45 #include <sys/nlookup.h>
46 #include <sys/vnode.h>
47 #include <sys/sysctl.h>
49 #include <vm/vm_zone.h>
51 #ifdef _KERNEL_VIRTUAL
59 /* Metadata from the static kernel */
60 SET_DECLARE(modmetadata_set
, struct mod_metadata
);
61 MALLOC_DEFINE(M_LINKER
, "kld", "kernel linker");
63 linker_file_t linker_current_file
;
64 linker_file_t linker_kernel_file
;
66 static struct lock lock
; /* lock for the file list */
67 static linker_class_list_t classes
;
68 static linker_file_list_t linker_files
;
69 static int next_file_id
= 1;
72 linker_init(void* arg
)
74 lockinit(&lock
, "klink", 0, 0);
76 TAILQ_INIT(&linker_files
);
79 SYSINIT(linker
, SI_BOOT2_KLD
, SI_ORDER_FIRST
, linker_init
, 0);
82 linker_add_class(const char* desc
, void* priv
,
83 struct linker_class_ops
* ops
)
87 lc
= kmalloc(sizeof(struct linker_class
), M_LINKER
, M_NOWAIT
| M_ZERO
);
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 ksprintf(koname
, "%s.ko", filename
);
267 TAILQ_FOREACH(lc
, &classes
, 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 can recognize this
303 error
= ENOENT
; /* Nothing found */
308 kfree(koname
, M_LINKER
);
313 linker_find_file_by_name(const char* filename
)
315 linker_file_t lf
= 0;
319 for (i
= strlen(filename
); i
> 0 && filename
[i
-1] != '/'; --i
)
323 koname
= kmalloc(strlen(filename
) + 4, M_LINKER
, M_WAITOK
);
324 ksprintf(koname
, "%s.ko", filename
);
326 lockmgr(&lock
, LK_SHARED
);
327 TAILQ_FOREACH(lf
, &linker_files
, link
) {
328 if (!strcmp(lf
->filename
, koname
))
330 if (!strcmp(lf
->filename
, filename
))
333 lockmgr(&lock
, LK_RELEASE
);
336 kfree(koname
, M_LINKER
);
341 linker_find_file_by_id(int fileid
)
343 linker_file_t lf
= 0;
345 lockmgr(&lock
, LK_SHARED
);
346 TAILQ_FOREACH(lf
, &linker_files
, link
)
347 if (lf
->id
== fileid
)
349 lockmgr(&lock
, LK_RELEASE
);
355 linker_make_file(const char* pathname
, void* priv
, struct linker_file_ops
* ops
)
357 linker_file_t lf
= 0;
359 const char *filename
;
361 filename
= rindex(pathname
, '/');
362 if (filename
&& filename
[1])
367 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename
));
368 lockmgr(&lock
, LK_EXCLUSIVE
);
369 namelen
= strlen(filename
) + 1;
370 lf
= kmalloc(sizeof(struct linker_file
) + namelen
, M_LINKER
, M_WAITOK
);
371 bzero(lf
, sizeof(*lf
));
376 lf
->filename
= (char*) (lf
+ 1);
377 strcpy(lf
->filename
, filename
);
378 lf
->id
= next_file_id
++;
381 STAILQ_INIT(&lf
->common
);
382 TAILQ_INIT(&lf
->modules
);
386 TAILQ_INSERT_TAIL(&linker_files
, lf
, link
);
388 lockmgr(&lock
, LK_RELEASE
);
393 linker_file_unload(linker_file_t file
)
396 struct common_symbol
* cp
;
400 /* Refuse to unload modules if securelevel raised */
401 if (securelevel
> 0 || kernel_mem_readonly
)
404 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file
->refs
));
405 lockmgr(&lock
, LK_EXCLUSIVE
);
406 if (file
->refs
== 1) {
407 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
409 * Temporarily bump file->refs to prevent recursive unloading
414 * Inform any modules associated with this file.
416 mod
= TAILQ_FIRST(&file
->modules
);
419 * Give the module a chance to veto the unload. Note that the
420 * act of unloading the module may cause other modules in the
421 * same file list to be unloaded recursively.
423 if ((error
= module_unload(mod
)) != 0) {
424 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
426 lockmgr(&lock
, LK_RELEASE
);
432 * Recursive relationships may prevent the release from
433 * immediately removing the module, or may remove other
434 * modules in the list.
436 next
= module_getfnext(mod
);
442 * Since we intend to destroy the file structure, we expect all
443 * modules to have been removed by now.
445 for (mod
= TAILQ_FIRST(&file
->modules
);
447 mod
= module_getfnext(mod
)
449 kprintf("linker_file_unload: module %p still has refs!\n", mod
);
455 if (file
->refs
> 0) {
456 lockmgr(&lock
, LK_RELEASE
);
460 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
461 if (file
->flags
& LINKER_FILE_LINKED
) {
462 linker_file_sysuninit(file
);
463 linker_file_unregister_sysctls(file
);
466 TAILQ_REMOVE(&linker_files
, file
, link
);
467 lockmgr(&lock
, LK_RELEASE
);
469 for (i
= 0; i
< file
->ndeps
; i
++)
470 linker_file_unload(file
->deps
[i
]);
471 kfree(file
->deps
, M_LINKER
);
473 for (cp
= STAILQ_FIRST(&file
->common
); cp
;
474 cp
= STAILQ_FIRST(&file
->common
)) {
475 STAILQ_REMOVE(&file
->common
, cp
, common_symbol
, link
);
479 file
->ops
->unload(file
);
480 kfree(file
, M_LINKER
);
487 linker_file_add_dependancy(linker_file_t file
, linker_file_t dep
)
489 linker_file_t
* newdeps
;
491 newdeps
= kmalloc((file
->ndeps
+ 1) * sizeof(linker_file_t
*),
492 M_LINKER
, M_WAITOK
| M_ZERO
);
495 bcopy(file
->deps
, newdeps
, file
->ndeps
* sizeof(linker_file_t
*));
496 kfree(file
->deps
, M_LINKER
);
498 file
->deps
= newdeps
;
499 file
->deps
[file
->ndeps
] = dep
;
504 * Locate a linker set and its contents.
505 * This is a helper function to avoid linker_if.h exposure elsewhere.
506 * Note: firstp and lastp are really void ***
509 linker_file_lookup_set(linker_file_t file
, const char *name
,
510 void *firstp
, void *lastp
, int *countp
)
512 return file
->ops
->lookup_set(file
, name
, firstp
, lastp
, countp
);
516 linker_file_lookup_symbol(linker_file_t file
, const char* name
, int deps
, caddr_t
*raddr
)
519 linker_symval_t symval
;
521 size_t common_size
= 0;
524 KLD_DPF(SYM
, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
527 if (file
->ops
->lookup_symbol(file
, name
, &sym
) == 0) {
528 file
->ops
->symbol_values(file
, sym
, &symval
);
531 * XXX Assume a common symbol if its value is 0 and it has a non-zero
532 * size, otherwise it could be an absolute symbol with a value of 0.
534 if (symval
.value
== 0 && symval
.size
!= 0) {
536 * For commons, first look them up in the dependancies and
537 * only allocate space if not found there.
539 common_size
= symval
.size
;
541 KLD_DPF(SYM
, ("linker_file_lookup_symbol: symbol.value=%x\n", symval
.value
));
542 *raddr
= symval
.value
;
547 for (i
= 0; i
< file
->ndeps
; i
++) {
548 if (linker_file_lookup_symbol(file
->deps
[i
], name
, 0, raddr
) == 0) {
549 KLD_DPF(SYM
, ("linker_file_lookup_symbol: deps value=%x\n", *raddr
));
554 /* If we have not found it in the dependencies, search globally */
555 TAILQ_FOREACH(lf
, &linker_files
, link
) {
556 /* But skip the current file if it's on the list */
559 /* And skip the files we searched above */
560 for (i
= 0; i
< file
->ndeps
; i
++)
561 if (lf
== file
->deps
[i
])
565 if (linker_file_lookup_symbol(lf
, name
, 0, raddr
) == 0) {
566 KLD_DPF(SYM
, ("linker_file_lookup_symbol: global value=%x\n", *raddr
));
572 if (common_size
> 0) {
574 * This is a common symbol which was not found in the
575 * dependancies. We maintain a simple common symbol table in
578 struct common_symbol
* cp
;
580 STAILQ_FOREACH(cp
, &file
->common
, link
)
581 if (!strcmp(cp
->name
, name
)) {
582 KLD_DPF(SYM
, ("linker_file_lookup_symbol: old common value=%x\n", cp
->address
));
583 *raddr
= cp
->address
;
588 * Round the symbol size up to align.
590 common_size
= (common_size
+ sizeof(int) - 1) & -sizeof(int);
591 cp
= kmalloc(sizeof(struct common_symbol
)
594 M_LINKER
, M_WAITOK
| M_ZERO
);
596 cp
->address
= (caddr_t
) (cp
+ 1);
597 cp
->name
= cp
->address
+ common_size
;
598 strcpy(cp
->name
, name
);
599 bzero(cp
->address
, common_size
);
600 STAILQ_INSERT_TAIL(&file
->common
, cp
, link
);
602 KLD_DPF(SYM
, ("linker_file_lookup_symbol: new common value=%x\n", cp
->address
));
603 *raddr
= cp
->address
;
607 #ifdef _KERNEL_VIRTUAL
608 *raddr
= dlsym(RTLD_NEXT
, name
);
609 if (*raddr
!= NULL
) {
610 KLD_DPF(SYM
, ("linker_file_lookup_symbol: found dlsym=%x\n", *raddr
));
615 KLD_DPF(SYM
, ("linker_file_lookup_symbol: fail\n"));
621 * DDB Helpers. DDB has to look across multiple files with their own
622 * symbol tables and string tables.
624 * Note that we do not obey list locking protocols here. We really don't
625 * need DDB to hang because somebody's got the lock held. We'll take the
626 * chance that the files list is inconsistant instead.
630 linker_ddb_lookup(const char *symstr
, c_linker_sym_t
*sym
)
634 TAILQ_FOREACH(lf
, &linker_files
, link
) {
635 if (lf
->ops
->lookup_symbol(lf
, symstr
, sym
) == 0)
642 linker_ddb_search_symbol(caddr_t value
, c_linker_sym_t
*sym
, long *diffp
)
645 u_long off
= (uintptr_t)value
;
646 u_long diff
, bestdiff
;
652 TAILQ_FOREACH(lf
, &linker_files
, link
) {
653 if (lf
->ops
->search_symbol(lf
, value
, &es
, &diff
) != 0)
655 if (es
!= 0 && diff
< bestdiff
) {
674 linker_ddb_symbol_values(c_linker_sym_t sym
, linker_symval_t
*symval
)
678 TAILQ_FOREACH(lf
, &linker_files
, link
) {
679 if (lf
->ops
->symbol_values(lf
, sym
, symval
) == 0)
692 sys_kldload(struct kldload_args
*uap
)
694 struct thread
*td
= curthread
;
695 char* filename
= NULL
, *modulename
;
699 uap
->sysmsg_result
= -1;
701 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
704 if ((error
= suser(td
)) != 0)
707 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
708 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
711 /* Can't load more than one module with the same name */
712 modulename
= rindex(filename
, '/');
713 if (modulename
== NULL
)
714 modulename
= filename
;
717 if (linker_find_file_by_name(modulename
)) {
722 if ((error
= linker_load_file(filename
, &lf
)) != 0)
726 uap
->sysmsg_result
= lf
->id
;
730 kfree(filename
, M_TEMP
);
735 sys_kldunload(struct kldunload_args
*uap
)
737 struct thread
*td
= curthread
;
741 if (securelevel
> 0 || kernel_mem_readonly
) /* redundant, but that's OK */
744 if ((error
= suser(td
)) != 0)
747 lf
= linker_find_file_by_id(uap
->fileid
);
749 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf
->userrefs
));
750 if (lf
->userrefs
== 0) {
751 kprintf("linkerunload: attempt to unload file that was loaded by the kernel\n");
756 error
= linker_file_unload(lf
);
767 sys_kldfind(struct kldfind_args
*uap
)
769 char *filename
= NULL
, *modulename
;
773 uap
->sysmsg_result
= -1;
775 filename
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
776 if ((error
= copyinstr(uap
->file
, filename
, MAXPATHLEN
, NULL
)) != 0)
779 modulename
= rindex(filename
, '/');
780 if (modulename
== NULL
)
781 modulename
= filename
;
783 lf
= linker_find_file_by_name(modulename
);
785 uap
->sysmsg_result
= lf
->id
;
791 kfree(filename
, M_TEMP
);
796 sys_kldnext(struct kldnext_args
*uap
)
801 if (uap
->fileid
== 0) {
802 if (TAILQ_FIRST(&linker_files
))
803 uap
->sysmsg_result
= TAILQ_FIRST(&linker_files
)->id
;
805 uap
->sysmsg_result
= 0;
809 lf
= linker_find_file_by_id(uap
->fileid
);
811 if (TAILQ_NEXT(lf
, link
))
812 uap
->sysmsg_result
= TAILQ_NEXT(lf
, link
)->id
;
814 uap
->sysmsg_result
= 0;
822 sys_kldstat(struct kldstat_args
*uap
)
827 struct kld_file_stat
* stat
;
830 lf
= linker_find_file_by_id(uap
->fileid
);
839 * Check the version of the user's structure.
841 if ((error
= copyin(&stat
->version
, &version
, sizeof(version
))) != 0)
843 if (version
!= sizeof(struct kld_file_stat
)) {
848 namelen
= strlen(lf
->filename
) + 1;
849 if (namelen
> MAXPATHLEN
)
850 namelen
= MAXPATHLEN
;
851 if ((error
= copyout(lf
->filename
, &stat
->name
[0], namelen
)) != 0)
853 if ((error
= copyout(&lf
->refs
, &stat
->refs
, sizeof(int))) != 0)
855 if ((error
= copyout(&lf
->id
, &stat
->id
, sizeof(int))) != 0)
857 if ((error
= copyout(&lf
->address
, &stat
->address
, sizeof(caddr_t
))) != 0)
859 if ((error
= copyout(&lf
->size
, &stat
->size
, sizeof(size_t))) != 0)
862 uap
->sysmsg_result
= 0;
869 sys_kldfirstmod(struct kldfirstmod_args
*uap
)
874 lf
= linker_find_file_by_id(uap
->fileid
);
876 if (TAILQ_FIRST(&lf
->modules
))
877 uap
->sysmsg_result
= module_getid(TAILQ_FIRST(&lf
->modules
));
879 uap
->sysmsg_result
= 0;
887 sys_kldsym(struct kldsym_args
*uap
)
891 linker_symval_t symval
;
893 struct kld_sym_lookup lookup
;
896 if ((error
= copyin(uap
->data
, &lookup
, sizeof(lookup
))) != 0)
898 if (lookup
.version
!= sizeof(lookup
) || uap
->cmd
!= KLDSYM_LOOKUP
) {
903 symstr
= kmalloc(MAXPATHLEN
, M_TEMP
, M_WAITOK
);
904 if ((error
= copyinstr(lookup
.symname
, symstr
, MAXPATHLEN
, NULL
)) != 0)
907 if (uap
->fileid
!= 0) {
908 lf
= linker_find_file_by_id(uap
->fileid
);
913 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
914 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
915 lookup
.symvalue
= (uintptr_t)symval
.value
;
916 lookup
.symsize
= symval
.size
;
917 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
921 TAILQ_FOREACH(lf
, &linker_files
, link
) {
922 if (lf
->ops
->lookup_symbol(lf
, symstr
, &sym
) == 0 &&
923 lf
->ops
->symbol_values(lf
, sym
, &symval
) == 0) {
924 lookup
.symvalue
= (uintptr_t)symval
.value
;
925 lookup
.symsize
= symval
.size
;
926 error
= copyout(&lookup
, uap
->data
, sizeof(lookup
));
935 kfree(symstr
, M_TEMP
);
940 * Look for module metadata in the static kernel
942 struct mod_metadata
*
943 find_mod_metadata(const char *modname
)
946 struct mod_metadata
**mdp
;
947 struct mod_metadata
*mdt
;
950 * Strip path prefixes and any dot extension. MDT_MODULE names
951 * are just the module name without a path or ".ko".
953 for (len
= strlen(modname
) - 1; len
>= 0; --len
) {
954 if (modname
[len
] == '/')
958 for (len
= 0; modname
[len
] && modname
[len
] != '.'; ++len
)
962 * Look for the module declaration
964 SET_FOREACH(mdp
, modmetadata_set
) {
966 if (mdt
->md_type
!= MDT_MODULE
)
968 if (strlen(mdt
->md_cval
) == len
&&
969 strncmp(mdt
->md_cval
, modname
, len
) == 0) {
977 * Preloaded module support
980 linker_preload(void* arg
)
988 struct sysinit
**sipp
;
989 const moduledata_t
*moddata
;
990 struct sysinit
**si_start
, **si_stop
;
993 while ((modptr
= preload_search_next_name(modptr
)) != NULL
) {
994 modname
= (char *)preload_search_info(modptr
, MODINFO_NAME
);
995 modtype
= (char *)preload_search_info(modptr
, MODINFO_TYPE
);
996 if (modname
== NULL
) {
997 kprintf("Preloaded module at %p does not have a name!\n", modptr
);
1000 if (modtype
== NULL
) {
1001 kprintf("Preloaded module at %p does not have a type!\n", modptr
);
1006 * This is a hack at the moment, but what's in FreeBSD-5 is even
1007 * worse so I'd rather the hack.
1009 kprintf("Preloaded %s \"%s\" at %p", modtype
, modname
, modptr
);
1010 if (find_mod_metadata(modname
)) {
1011 kprintf(" (ignored, already in static kernel)\n");
1016 lf
= linker_find_file_by_name(modname
);
1023 TAILQ_FOREACH(lc
, &classes
, link
) {
1024 error
= lc
->ops
->load_file(modname
, &lf
);
1033 if (linker_file_lookup_set(lf
, "sysinit_set", &si_start
, &si_stop
, NULL
) == 0) {
1035 * This is to set the sysinit moduledata so that the module
1036 * can attach itself to the correct containing file.
1037 * The sysinit could be run at *any* time.
1039 for (sipp
= si_start
; sipp
< si_stop
; sipp
++) {
1040 if ((*sipp
)->func
== module_register_init
) {
1041 moddata
= (*sipp
)->udata
;
1042 error
= module_register(moddata
, lf
);
1044 kprintf("Preloaded %s \"%s\" failed to register: %d\n",
1045 modtype
, modname
, error
);
1048 sysinit_add(si_start
, si_stop
);
1050 linker_file_register_sysctls(lf
);
1055 SYSINIT(preload
, SI_BOOT2_KLD
, SI_ORDER_MIDDLE
, linker_preload
, 0);
1058 * Search for a not-loaded module by name.
1060 * Modules may be found in the following locations:
1062 * - preloaded (result is just the module name)
1063 * - on disk (result is full path to module)
1065 * If the module name is qualified in any way (contains path, etc.)
1066 * the we simply return a copy of it.
1068 * The search path can be manipulated via sysctl. Note that we use the ';'
1069 * character as a separator to be consistent with the bootloader.
1072 static char linker_path
[MAXPATHLEN
] = "/;/boot;/modules";
1074 SYSCTL_STRING(_kern
, OID_AUTO
, module_path
, CTLFLAG_RW
, linker_path
,
1075 sizeof(linker_path
), "module load search path");
1076 TUNABLE_STR("module_path", linker_path
, sizeof(linker_path
));
1079 linker_strdup(const char *str
)
1083 result
= kmalloc(strlen(str
) + 1, M_LINKER
, M_WAITOK
);
1084 strcpy(result
, str
);
1089 linker_search_path(const char *name
)
1091 struct nlookupdata nd
;
1092 char *cp
, *ep
, *result
;
1093 size_t name_len
, prefix_len
;
1098 /* qualified at all? */
1099 if (index(name
, '/'))
1100 return(linker_strdup(name
));
1102 /* traverse the linker path */
1104 name_len
= strlen(name
);
1107 /* find the end of this component */
1108 for (ep
= cp
; (*ep
!= 0) && (*ep
!= ';'); ep
++)
1110 prefix_len
= ep
- cp
;
1111 /* if this component doesn't end with a slash, add one */
1112 if (ep
== cp
|| *(ep
- 1) != '/')
1118 * +2 : possible separator, plus terminator.
1120 result
= kmalloc(prefix_len
+ name_len
+ 2, M_LINKER
, M_WAITOK
);
1122 strncpy(result
, cp
, prefix_len
);
1124 result
[prefix_len
++] = '/';
1125 strcpy(result
+ prefix_len
, name
);
1128 * Attempt to open the file, and return the path if we succeed and it's
1131 error
= nlookup_init(&nd
, result
, UIO_SYSSPACE
, NLC_FOLLOW
|NLC_LOCKVP
);
1133 error
= vn_open(&nd
, NULL
, FREAD
, 0);
1135 type
= nd
.nl_open_vp
->v_type
;
1142 kfree(result
, M_LINKER
);