Fix PCI deadlock on boot
[dragonfly.git] / sys / kern / kern_linker.c
CommitLineData
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1/*-
2 * Copyright (c) 1997 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/kern/kern_linker.c,v 1.41.2.3 2001/11/21 17:50:35 luigi Exp $
a3d55cbb 27 * $DragonFly: src/sys/kern/kern_linker.c,v 1.16 2003/11/21 23:30:42 dillon Exp $
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28 */
29
30#include "opt_ddb.h"
31
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>
38#include <sys/proc.h>
39#include <sys/lock.h>
40#include <sys/module.h>
41#include <sys/linker.h>
42#include <sys/fcntl.h>
43#include <sys/libkern.h>
44#include <sys/namei.h>
45#include <sys/vnode.h>
46#include <sys/sysctl.h>
47
48#include <vm/vm_zone.h>
49
50#ifdef KLD_DEBUG
51int kld_debug = 0;
52#endif
53
6456e0ad
MD
54/* Metadata from the static kernel */
55SET_DECLARE(modmetadata_set, struct mod_metadata);
984263bc 56MALLOC_DEFINE(M_LINKER, "kld", "kernel linker");
6456e0ad 57
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58linker_file_t linker_current_file;
59linker_file_t linker_kernel_file;
60
61static struct lock lock; /* lock for the file list */
62static linker_class_list_t classes;
63static linker_file_list_t linker_files;
64static int next_file_id = 1;
65
66static void
67linker_init(void* arg)
68{
377d4740 69 lockinit(&lock, 0, "klink", 0, 0);
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70 TAILQ_INIT(&classes);
71 TAILQ_INIT(&linker_files);
72}
73
74SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
75
76int
77linker_add_class(const char* desc, void* priv,
78 struct linker_class_ops* ops)
79{
80 linker_class_t lc;
81
82 lc = malloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT);
83 if (!lc)
84 return ENOMEM;
85 bzero(lc, sizeof(*lc));
86
87 lc->desc = desc;
88 lc->priv = priv;
89 lc->ops = ops;
90 TAILQ_INSERT_HEAD(&classes, lc, link);
91
92 return 0;
93}
94
95static int
96linker_file_sysinit(linker_file_t lf)
97{
dc62b251 98 struct sysinit** start, ** stop;
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99 struct sysinit** sipp;
100 struct sysinit** xipp;
101 struct sysinit* save;
102 const moduledata_t *moddata;
103 int error;
104
105 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
106 lf->filename));
107
dc62b251 108 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
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109 return 0; /* XXX is this correct ? No sysinit ? */
110
111 /* HACK ALERT! */
dc62b251 112 for (sipp = start; sipp < stop; sipp++) {
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113 if ((*sipp)->func == module_register_init) {
114 moddata = (*sipp)->udata;
115 error = module_register(moddata, lf);
116 if (error) {
117 printf("linker_file_sysinit \"%s\" failed to register! %d\n",
118 lf->filename, error);
119 return error;
120 }
121 }
122 }
123
124 /*
125 * Perform a bubble sort of the system initialization objects by
126 * their subsystem (primary key) and order (secondary key).
127 *
128 * Since some things care about execution order, this is the
129 * operation which ensures continued function.
130 */
dc62b251
MD
131 for (sipp = start; sipp < stop; sipp++) {
132 for (xipp = sipp + 1; xipp < stop; xipp++) {
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133 if ((*sipp)->subsystem < (*xipp)->subsystem ||
134 ((*sipp)->subsystem == (*xipp)->subsystem &&
135 (*sipp)->order <= (*xipp)->order))
136 continue; /* skip*/
137 save = *sipp;
138 *sipp = *xipp;
139 *xipp = save;
140 }
141 }
142
143
144 /*
145 * Traverse the (now) ordered list of system initialization tasks.
146 * Perform each task, and continue on to the next task.
147 */
dc62b251 148 for (sipp = start; sipp < stop; sipp++) {
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149 if ((*sipp)->subsystem == SI_SUB_DUMMY)
150 continue; /* skip dummy task(s)*/
151
152 /* Call function */
153 (*((*sipp)->func))((*sipp)->udata);
154 }
155 return 0; /* no errors */
156}
157
158static void
159linker_file_sysuninit(linker_file_t lf)
160{
dc62b251 161 struct sysinit** start, ** stop;
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162 struct sysinit** sipp;
163 struct sysinit** xipp;
164 struct sysinit* save;
165
166 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
167 lf->filename));
168
dc62b251 169 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, NULL) != 0)
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170 return;
171
172 /*
173 * Perform a reverse bubble sort of the system initialization objects
174 * by their subsystem (primary key) and order (secondary key).
175 *
176 * Since some things care about execution order, this is the
177 * operation which ensures continued function.
178 */
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MD
179 for (sipp = start; sipp < stop; sipp++) {
180 for (xipp = sipp + 1; xipp < stop; xipp++) {
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181 if ((*sipp)->subsystem > (*xipp)->subsystem ||
182 ((*sipp)->subsystem == (*xipp)->subsystem &&
183 (*sipp)->order >= (*xipp)->order))
184 continue; /* skip*/
185 save = *sipp;
186 *sipp = *xipp;
187 *xipp = save;
188 }
189 }
190
191
192 /*
193 * Traverse the (now) ordered list of system initialization tasks.
194 * Perform each task, and continue on to the next task.
195 */
dc62b251 196 for (sipp = start; sipp < stop; sipp++) {
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197 if ((*sipp)->subsystem == SI_SUB_DUMMY)
198 continue; /* skip dummy task(s)*/
199
200 /* Call function */
201 (*((*sipp)->func))((*sipp)->udata);
202 }
203}
204
205static void
206linker_file_register_sysctls(linker_file_t lf)
207{
dc62b251 208 struct sysctl_oid **start, **stop, **oidp;
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209
210 KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
211 lf->filename));
212
dc62b251 213 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
d1786c1b 214 return;
dc62b251
MD
215 for (oidp = start; oidp < stop; oidp++)
216 sysctl_register_oid(*oidp);
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217}
218
219static void
220linker_file_unregister_sysctls(linker_file_t lf)
221{
dc62b251 222 struct sysctl_oid **start, **stop, **oidp;
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223
224 KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n",
225 lf->filename));
226
dc62b251 227 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
984263bc 228 return;
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MD
229 for (oidp = start; oidp < stop; oidp++)
230 sysctl_unregister_oid(*oidp);
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231}
232
233int
234linker_load_file(const char* filename, linker_file_t* result)
235{
236 linker_class_t lc;
237 linker_file_t lf;
238 int foundfile, error = 0;
239 char *koname = NULL;
240
241 /* Refuse to load modules if securelevel raised */
242 if (securelevel > 0)
243 return EPERM;
244
245 lf = linker_find_file_by_name(filename);
246 if (lf) {
247 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
248 *result = lf;
249 lf->refs++;
250 goto out;
251 }
32832096
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252 if (find_mod_metadata(filename)) {
253 if (linker_kernel_file)
254 ++linker_kernel_file->refs;
255 *result = linker_kernel_file;
256 goto out;
257 }
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258
259 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
260 if (koname == NULL) {
261 error = ENOMEM;
262 goto out;
263 }
264 sprintf(koname, "%s.ko", filename);
265 lf = NULL;
266 foundfile = 0;
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));
270
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 */
274 /*
275 * If we got something other than ENOENT, then it exists but we cannot
276 * load it for some other reason.
277 */
278 if (error != ENOENT)
279 foundfile = 1;
280 if (lf) {
281 linker_file_register_sysctls(lf);
282 error = linker_file_sysinit(lf);
283
284 *result = lf;
285 goto out;
286 }
287 }
288 /*
289 * Less than ideal, but tells the user whether it failed to load or
290 * the module was not found.
291 */
828a7fe6
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292 if (foundfile) {
293 /*
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
299 * dialog messages.
300 */
301 if (error != EEXIST)
302 error = ENOEXEC;
32832096 303 } else {
984263bc 304 error = ENOENT; /* Nothing found */
32832096 305 }
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306
307out:
308 if (koname)
309 free(koname, M_LINKER);
310 return error;
311}
312
313linker_file_t
314linker_find_file_by_name(const char* filename)
315{
316 linker_file_t lf = 0;
317 char *koname;
a3d55cbb
MD
318 int i;
319
320 for (i = strlen(filename); i > 0 && filename[i-1] != '/'; --i)
321 ;
322 filename += i;
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323
324 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
325 if (koname == NULL)
326 goto out;
327 sprintf(koname, "%s.ko", filename);
328
dadab5e9 329 lockmgr(&lock, LK_SHARED, 0, curthread);
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330 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
331 if (!strcmp(lf->filename, koname))
332 break;
333 if (!strcmp(lf->filename, filename))
334 break;
335 }
dadab5e9 336 lockmgr(&lock, LK_RELEASE, 0, curthread);
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337
338out:
339 if (koname)
340 free(koname, M_LINKER);
341 return lf;
342}
343
344linker_file_t
345linker_find_file_by_id(int fileid)
346{
347 linker_file_t lf = 0;
348
dadab5e9 349 lockmgr(&lock, LK_SHARED, 0, curthread);
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350 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link))
351 if (lf->id == fileid)
352 break;
dadab5e9 353 lockmgr(&lock, LK_RELEASE, 0, curthread);
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354
355 return lf;
356}
357
358linker_file_t
359linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
360{
361 linker_file_t lf = 0;
362 int namelen;
363 const char *filename;
364
365 filename = rindex(pathname, '/');
366 if (filename && filename[1])
367 filename++;
368 else
369 filename = pathname;
370
371 KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
dadab5e9 372 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
984263bc
MD
373 namelen = strlen(filename) + 1;
374 lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
375 if (!lf)
376 goto out;
377 bzero(lf, sizeof(*lf));
378
379 lf->refs = 1;
380 lf->userrefs = 0;
381 lf->flags = 0;
382 lf->filename = (char*) (lf + 1);
383 strcpy(lf->filename, filename);
384 lf->id = next_file_id++;
385 lf->ndeps = 0;
386 lf->deps = NULL;
387 STAILQ_INIT(&lf->common);
388 TAILQ_INIT(&lf->modules);
389
390 lf->priv = priv;
391 lf->ops = ops;
392 TAILQ_INSERT_TAIL(&linker_files, lf, link);
393
394out:
dadab5e9 395 lockmgr(&lock, LK_RELEASE, 0, curthread);
984263bc
MD
396 return lf;
397}
398
399int
400linker_file_unload(linker_file_t file)
401{
402 module_t mod, next;
403 struct common_symbol* cp;
404 int error = 0;
405 int i;
406
407 /* Refuse to unload modules if securelevel raised */
408 if (securelevel > 0)
409 return EPERM;
410
411 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
dadab5e9 412 lockmgr(&lock, LK_EXCLUSIVE, 0, curthread);
984263bc
MD
413 if (file->refs == 1) {
414 KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
415 /*
416 * Inform any modules associated with this file.
417 */
418 for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
419 next = module_getfnext(mod);
420
421 /*
422 * Give the module a chance to veto the unload.
423 */
424 if ((error = module_unload(mod)) != 0) {
425 KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
426 mod));
dadab5e9 427 lockmgr(&lock, LK_RELEASE, 0, curthread);
984263bc
MD
428 goto out;
429 }
430
431 module_release(mod);
432 }
433 }
434
435 file->refs--;
436 if (file->refs > 0) {
dadab5e9 437 lockmgr(&lock, LK_RELEASE, 0, curthread);
984263bc
MD
438 goto out;
439 }
440
441 /* Don't try to run SYSUNINITs if we are unloaded due to a link error */
442 if (file->flags & LINKER_FILE_LINKED) {
443 linker_file_sysuninit(file);
444 linker_file_unregister_sysctls(file);
445 }
446
447 TAILQ_REMOVE(&linker_files, file, link);
dadab5e9 448 lockmgr(&lock, LK_RELEASE, 0, curthread);
984263bc
MD
449
450 for (i = 0; i < file->ndeps; i++)
451 linker_file_unload(file->deps[i]);
452 free(file->deps, M_LINKER);
453
454 for (cp = STAILQ_FIRST(&file->common); cp;
455 cp = STAILQ_FIRST(&file->common)) {
456 STAILQ_REMOVE(&file->common, cp, common_symbol, link);
457 free(cp, M_LINKER);
458 }
459
460 file->ops->unload(file);
461 free(file, M_LINKER);
462
463out:
464 return error;
465}
466
467int
468linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
469{
470 linker_file_t* newdeps;
471
472 newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*),
473 M_LINKER, M_WAITOK);
474 if (newdeps == NULL)
475 return ENOMEM;
476 bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*));
477
478 if (file->deps) {
479 bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
480 free(file->deps, M_LINKER);
481 }
482 file->deps = newdeps;
483 file->deps[file->ndeps] = dep;
484 file->ndeps++;
485
486 return 0;
487}
488
dc62b251
MD
489/*
490 * Locate a linker set and its contents.
491 * This is a helper function to avoid linker_if.h exposure elsewhere.
492 * Note: firstp and lastp are really void ***
493 */
494int
495linker_file_lookup_set(linker_file_t file, const char *name,
496 void *firstp, void *lastp, int *countp)
497{
498 return file->ops->lookup_set(file, name, firstp, lastp, countp);
499}
500
d1786c1b
MD
501int
502linker_file_lookup_symbol(linker_file_t file, const char* name, int deps, caddr_t *raddr)
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MD
503{
504 c_linker_sym_t sym;
505 linker_symval_t symval;
506 linker_file_t lf;
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MD
507 size_t common_size = 0;
508 int i;
509
510 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
511 file, name, deps));
512
513 if (file->ops->lookup_symbol(file, name, &sym) == 0) {
514 file->ops->symbol_values(file, sym, &symval);
d1786c1b
MD
515
516 /*
517 * XXX Assume a common symbol if its value is 0 and it has a non-zero
518 * size, otherwise it could be an absolute symbol with a value of 0.
519 */
520 if (symval.value == 0 && symval.size != 0) {
984263bc
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521 /*
522 * For commons, first look them up in the dependancies and
523 * only allocate space if not found there.
524 */
525 common_size = symval.size;
d1786c1b 526 } else {
984263bc 527 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
d1786c1b
MD
528 *raddr = symval.value;
529 return 0;
984263bc
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530 }
531 }
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MD
532 if (deps) {
533 for (i = 0; i < file->ndeps; i++) {
d1786c1b
MD
534 if (linker_file_lookup_symbol(file->deps[i], name, 0, raddr) == 0) {
535 KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", *raddr));
536 return 0;
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MD
537 }
538 }
539
540 /* If we have not found it in the dependencies, search globally */
541 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
542 /* But skip the current file if it's on the list */
543 if (lf == file)
544 continue;
545 /* And skip the files we searched above */
546 for (i = 0; i < file->ndeps; i++)
547 if (lf == file->deps[i])
548 break;
549 if (i < file->ndeps)
550 continue;
d1786c1b
MD
551 if (linker_file_lookup_symbol(lf, name, 0, raddr) == 0) {
552 KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", *raddr));
553 return 0;
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MD
554 }
555 }
556 }
557
558 if (common_size > 0) {
559 /*
560 * This is a common symbol which was not found in the
561 * dependancies. We maintain a simple common symbol table in
562 * the file object.
563 */
564 struct common_symbol* cp;
565
566 for (cp = STAILQ_FIRST(&file->common); cp;
567 cp = STAILQ_NEXT(cp, link))
568 if (!strcmp(cp->name, name)) {
569 KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
d1786c1b
MD
570 *raddr = cp->address;
571 return 0;
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MD
572 }
573
574 /*
575 * Round the symbol size up to align.
576 */
577 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
578 cp = malloc(sizeof(struct common_symbol)
579 + common_size
580 + strlen(name) + 1,
581 M_LINKER, M_WAITOK);
582 if (!cp) {
583 KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
d1786c1b 584 return ENOMEM;
984263bc
MD
585 }
586 bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
587
588 cp->address = (caddr_t) (cp + 1);
589 cp->name = cp->address + common_size;
590 strcpy(cp->name, name);
591 bzero(cp->address, common_size);
592 STAILQ_INSERT_TAIL(&file->common, cp, link);
593
594 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
d1786c1b
MD
595 *raddr = cp->address;
596 return 0;
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MD
597 }
598
599 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
d1786c1b 600 return ENOENT;
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MD
601}
602
603#ifdef DDB
604/*
605 * DDB Helpers. DDB has to look across multiple files with their own
606 * symbol tables and string tables.
607 *
608 * Note that we do not obey list locking protocols here. We really don't
609 * need DDB to hang because somebody's got the lock held. We'll take the
610 * chance that the files list is inconsistant instead.
611 */
612
613int
614linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
615{
616 linker_file_t lf;
617
618 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
619 if (lf->ops->lookup_symbol(lf, symstr, sym) == 0)
620 return 0;
621 }
622 return ENOENT;
623}
624
625int
626linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
627{
628 linker_file_t lf;
629 u_long off = (uintptr_t)value;
630 u_long diff, bestdiff;
631 c_linker_sym_t best;
632 c_linker_sym_t es;
633
634 best = 0;
635 bestdiff = off;
636 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
637 if (lf->ops->search_symbol(lf, value, &es, &diff) != 0)
638 continue;
639 if (es != 0 && diff < bestdiff) {
640 best = es;
641 bestdiff = diff;
642 }
643 if (bestdiff == 0)
644 break;
645 }
646 if (best) {
647 *sym = best;
648 *diffp = bestdiff;
649 return 0;
650 } else {
651 *sym = 0;
652 *diffp = off;
653 return ENOENT;
654 }
655}
656
657int
658linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
659{
660 linker_file_t lf;
661
662 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
663 if (lf->ops->symbol_values(lf, sym, symval) == 0)
664 return 0;
665 }
666 return ENOENT;
667}
668
669#endif
670
671/*
672 * Syscalls.
673 */
674
675int
41c20dac 676kldload(struct kldload_args *uap)
984263bc 677{
dadab5e9 678 struct thread *td = curthread;
984263bc
MD
679 char* filename = NULL, *modulename;
680 linker_file_t lf;
681 int error = 0;
682
c7114eea 683 uap->sysmsg_result = -1;
984263bc
MD
684
685 if (securelevel > 0) /* redundant, but that's OK */
686 return EPERM;
687
dadab5e9 688 if ((error = suser(td)) != 0)
984263bc
MD
689 return error;
690
691 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
692 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
693 goto out;
694
695 /* Can't load more than one module with the same name */
696 modulename = rindex(filename, '/');
697 if (modulename == NULL)
698 modulename = filename;
699 else
700 modulename++;
701 if (linker_find_file_by_name(modulename)) {
702 error = EEXIST;
703 goto out;
704 }
705
706 if ((error = linker_load_file(filename, &lf)) != 0)
707 goto out;
708
709 lf->userrefs++;
c7114eea 710 uap->sysmsg_result = lf->id;
984263bc
MD
711
712out:
713 if (filename)
714 free(filename, M_TEMP);
715 return error;
716}
717
718int
41c20dac 719kldunload(struct kldunload_args *uap)
984263bc 720{
dadab5e9 721 struct thread *td = curthread;
984263bc
MD
722 linker_file_t lf;
723 int error = 0;
724
725 if (securelevel > 0) /* redundant, but that's OK */
726 return EPERM;
727
dadab5e9 728 if ((error = suser(td)) != 0)
984263bc
MD
729 return error;
730
731 lf = linker_find_file_by_id(SCARG(uap, fileid));
732 if (lf) {
733 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
734 if (lf->userrefs == 0) {
735 printf("linkerunload: attempt to unload file that was loaded by the kernel\n");
736 error = EBUSY;
737 goto out;
738 }
739 lf->userrefs--;
740 error = linker_file_unload(lf);
741 if (error)
742 lf->userrefs++;
743 } else
744 error = ENOENT;
745
746out:
747 return error;
748}
749
750int
41c20dac 751kldfind(struct kldfind_args *uap)
984263bc 752{
41c20dac 753 char *filename = NULL, *modulename;
984263bc
MD
754 linker_file_t lf;
755 int error = 0;
756
c7114eea 757 uap->sysmsg_result = -1;
984263bc
MD
758
759 filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
760 if ((error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL)) != 0)
761 goto out;
762
763 modulename = rindex(filename, '/');
764 if (modulename == NULL)
765 modulename = filename;
766
767 lf = linker_find_file_by_name(modulename);
768 if (lf)
c7114eea 769 uap->sysmsg_result = lf->id;
984263bc
MD
770 else
771 error = ENOENT;
772
773out:
774 if (filename)
775 free(filename, M_TEMP);
776 return error;
777}
778
779int
41c20dac 780kldnext(struct kldnext_args *uap)
984263bc
MD
781{
782 linker_file_t lf;
783 int error = 0;
784
785 if (SCARG(uap, fileid) == 0) {
786 if (TAILQ_FIRST(&linker_files))
c7114eea 787 uap->sysmsg_result = TAILQ_FIRST(&linker_files)->id;
984263bc 788 else
c7114eea 789 uap->sysmsg_result = 0;
984263bc
MD
790 return 0;
791 }
792
793 lf = linker_find_file_by_id(SCARG(uap, fileid));
794 if (lf) {
795 if (TAILQ_NEXT(lf, link))
c7114eea 796 uap->sysmsg_result = TAILQ_NEXT(lf, link)->id;
984263bc 797 else
c7114eea 798 uap->sysmsg_result = 0;
984263bc
MD
799 } else
800 error = ENOENT;
801
802 return error;
803}
804
805int
41c20dac 806kldstat(struct kldstat_args *uap)
984263bc
MD
807{
808 linker_file_t lf;
809 int error = 0;
810 int version;
811 struct kld_file_stat* stat;
812 int namelen;
813
814 lf = linker_find_file_by_id(SCARG(uap, fileid));
815 if (!lf) {
816 error = ENOENT;
817 goto out;
818 }
819
820 stat = SCARG(uap, stat);
821
822 /*
823 * Check the version of the user's structure.
824 */
825 if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
826 goto out;
827 if (version != sizeof(struct kld_file_stat)) {
828 error = EINVAL;
829 goto out;
830 }
831
832 namelen = strlen(lf->filename) + 1;
833 if (namelen > MAXPATHLEN)
834 namelen = MAXPATHLEN;
835 if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
836 goto out;
837 if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
838 goto out;
839 if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
840 goto out;
841 if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0)
842 goto out;
843 if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
844 goto out;
845
c7114eea 846 uap->sysmsg_result = 0;
984263bc
MD
847
848out:
849 return error;
850}
851
852int
41c20dac 853kldfirstmod(struct kldfirstmod_args *uap)
984263bc
MD
854{
855 linker_file_t lf;
856 int error = 0;
857
858 lf = linker_find_file_by_id(SCARG(uap, fileid));
859 if (lf) {
860 if (TAILQ_FIRST(&lf->modules))
c7114eea 861 uap->sysmsg_result = module_getid(TAILQ_FIRST(&lf->modules));
984263bc 862 else
c7114eea 863 uap->sysmsg_result = 0;
984263bc
MD
864 } else
865 error = ENOENT;
866
867 return error;
868}
869
870int
41c20dac 871kldsym(struct kldsym_args *uap)
984263bc
MD
872{
873 char *symstr = NULL;
874 c_linker_sym_t sym;
875 linker_symval_t symval;
876 linker_file_t lf;
877 struct kld_sym_lookup lookup;
878 int error = 0;
879
880 if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0)
881 goto out;
882 if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) {
883 error = EINVAL;
884 goto out;
885 }
886
887 symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
888 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
889 goto out;
890
891 if (SCARG(uap, fileid) != 0) {
892 lf = linker_find_file_by_id(SCARG(uap, fileid));
893 if (lf == NULL) {
894 error = ENOENT;
895 goto out;
896 }
897 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
898 lf->ops->symbol_values(lf, sym, &symval) == 0) {
899 lookup.symvalue = (uintptr_t)symval.value;
900 lookup.symsize = symval.size;
901 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
902 } else
903 error = ENOENT;
904 } else {
905 for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) {
906 if (lf->ops->lookup_symbol(lf, symstr, &sym) == 0 &&
907 lf->ops->symbol_values(lf, sym, &symval) == 0) {
908 lookup.symvalue = (uintptr_t)symval.value;
909 lookup.symsize = symval.size;
910 error = copyout(&lookup, SCARG(uap, data), sizeof(lookup));
911 break;
912 }
913 }
914 if (!lf)
915 error = ENOENT;
916 }
917out:
918 if (symstr)
919 free(symstr, M_TEMP);
920 return error;
921}
922
32832096
MD
923/*
924 * Look for module metadata in the static kernel
925 */
926struct mod_metadata *
6456e0ad
MD
927find_mod_metadata(const char *modname)
928{
929 int len;
930 struct mod_metadata **mdp;
931 struct mod_metadata *mdt;
932
933 /*
32832096
MD
934 * Strip path prefixes and any dot extension. MDT_MODULE names
935 * are just the module name without a path or ".ko".
6456e0ad
MD
936 */
937 for (len = strlen(modname) - 1; len >= 0; --len) {
938 if (modname[len] == '/')
939 break;
940 }
941 modname += len + 1;
942 for (len = 0; modname[len] && modname[len] != '.'; ++len)
943 ;
944
945 /*
946 * Look for the module declaration
947 */
948 SET_FOREACH(mdp, modmetadata_set) {
949 mdt = *mdp;
950 if (mdt->md_type != MDT_MODULE)
951 continue;
952 if (strlen(mdt->md_cval) == len &&
953 strncmp(mdt->md_cval, modname, len) == 0
954 ) {
955 return(mdt);
956 }
957 }
958 return(NULL);
959}
960
984263bc
MD
961/*
962 * Preloaded module support
963 */
984263bc
MD
964static void
965linker_preload(void* arg)
966{
967 caddr_t modptr;
968 char *modname;
969 char *modtype;
970 linker_file_t lf;
971 linker_class_t lc;
972 int error;
984263bc
MD
973 struct sysinit **sipp;
974 const moduledata_t *moddata;
dc62b251 975 struct sysinit **si_start, **si_stop;
984263bc
MD
976
977 modptr = NULL;
978 while ((modptr = preload_search_next_name(modptr)) != NULL) {
979 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
980 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
981 if (modname == NULL) {
982 printf("Preloaded module at %p does not have a name!\n", modptr);
983 continue;
984 }
985 if (modtype == NULL) {
986 printf("Preloaded module at %p does not have a type!\n", modptr);
987 continue;
988 }
6456e0ad
MD
989
990 /*
991 * This is a hack at the moment, but what's in FreeBSD-5 is even
992 * worse so I'd rather the hack.
993 */
994 printf("Preloaded %s \"%s\" at %p", modtype, modname, modptr);
995 if (find_mod_metadata(modname)) {
996 printf(" (ignored, already in static kernel)\n");
997 continue;
998 }
999 printf(".\n");
1000
984263bc
MD
1001 lf = linker_find_file_by_name(modname);
1002 if (lf) {
1003 lf->userrefs++;
1004 continue;
1005 }
1006 lf = NULL;
1007 for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
1008 error = lc->ops->load_file(modname, &lf);
1009 if (error) {
1010 lf = NULL;
1011 break;
1012 }
1013 }
1014 if (lf) {
1015 lf->userrefs++;
1016
dc62b251 1017 if (linker_file_lookup_set(lf, "sysinit_set", &si_start, &si_stop, NULL) == 0) {
984263bc
MD
1018 /* HACK ALERT!
1019 * This is to set the sysinit moduledata so that the module
1020 * can attach itself to the correct containing file.
1021 * The sysinit could be run at *any* time.
1022 */
dc62b251 1023 for (sipp = si_start; sipp < si_stop; sipp++) {
984263bc
MD
1024 if ((*sipp)->func == module_register_init) {
1025 moddata = (*sipp)->udata;
1026 error = module_register(moddata, lf);
1027 if (error)
1028 printf("Preloaded %s \"%s\" failed to register: %d\n",
1029 modtype, modname, error);
1030 }
1031 }
dc62b251 1032 sysinit_add(si_start, si_stop);
984263bc
MD
1033 }
1034 linker_file_register_sysctls(lf);
1035 }
1036 }
1037}
1038
1039SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
1040
1041/*
1042 * Search for a not-loaded module by name.
1043 *
1044 * Modules may be found in the following locations:
1045 *
1046 * - preloaded (result is just the module name)
1047 * - on disk (result is full path to module)
1048 *
1049 * If the module name is qualified in any way (contains path, etc.)
1050 * the we simply return a copy of it.
1051 *
1052 * The search path can be manipulated via sysctl. Note that we use the ';'
1053 * character as a separator to be consistent with the bootloader.
1054 */
1055
1056static char linker_path[MAXPATHLEN] = "/;/boot/;/modules/";
1057
1058SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
1059 sizeof(linker_path), "module load search path");
1060
1061static char *
1062linker_strdup(const char *str)
1063{
1064 char *result;
1065
1066 if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
1067 strcpy(result, str);
1068 return(result);
1069}
1070
1071char *
1072linker_search_path(const char *name)
1073{
1074 struct nameidata nd;
dadab5e9 1075 struct thread *td = curthread;
984263bc
MD
1076 char *cp, *ep, *result;
1077 int error;
1078 enum vtype type;
1079
1080 /* qualified at all? */
1081 if (index(name, '/'))
1082 return(linker_strdup(name));
1083
1084 /* traverse the linker path */
1085 cp = linker_path;
1086 for (;;) {
1087
1088 /* find the end of this component */
1089 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++)
1090 ;
1091 result = malloc((strlen(name) + (ep - cp) + 1), M_LINKER, M_WAITOK);
1092 if (result == NULL) /* actually ENOMEM */
1093 return(NULL);
1094
1095 strncpy(result, cp, ep - cp);
1096 strcpy(result + (ep - cp), name);
1097
1098 /*
1099 * Attempt to open the file, and return the path if we succeed and it's
1100 * a regular file.
1101 */
2b69e610 1102 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_SYSSPACE, result, td);
984263bc
MD
1103 error = vn_open(&nd, FREAD, 0);
1104 if (error == 0) {
1105 NDFREE(&nd, NDF_ONLY_PNBUF);
1106 type = nd.ni_vp->v_type;
dadab5e9 1107 VOP_UNLOCK(nd.ni_vp, 0, td);
3b568787 1108 vn_close(nd.ni_vp, FREAD, td);
984263bc
MD
1109 if (type == VREG)
1110 return(result);
1111 }
1112 free(result, M_LINKER);
1113
1114 if (*ep == 0)
1115 break;
1116 cp = ep + 1;
1117 }
1118 return(NULL);
1119}