Add missing files

2 files changed, 2154 insertions, 0 deletions

diff --git a/freebsd/kern/kern_linker.c b/freebsd/kern/kern_linker.c
new file mode 100644
index 00000000..15141f22
--- /dev/null
+++ b/freebsd/kern/kern_linker.c
@@ -0,0 +1,2153 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (c) 1997-2000 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/local/opt_ddb.h>
+#include <freebsd/local/opt_hwpmc_hooks.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/sysproto.h>
+#include <freebsd/sys/sysent.h>
+#include <freebsd/sys/priv.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/lock.h>
+#include <freebsd/sys/mutex.h>
+#include <freebsd/sys/sx.h>
+#include <freebsd/sys/module.h>
+#include <freebsd/sys/mount.h>
+#include <freebsd/sys/linker.h>
+#include <freebsd/sys/fcntl.h>
+#include <freebsd/sys/jail.h>
+#include <freebsd/sys/libkern.h>
+#include <freebsd/sys/namei.h>
+#include <freebsd/sys/vnode.h>
+#include <freebsd/sys/syscallsubr.h>
+#include <freebsd/sys/sysctl.h>
+
+#include <freebsd/net/vnet.h>
+
+#include <freebsd/security/mac/mac_framework.h>
+
+#include <freebsd/local/linker_if.h>
+
+#ifdef HWPMC_HOOKS
+#include <freebsd/sys/pmckern.h>
+#endif
+
+#ifndef __rtems__
+#ifdef KLD_DEBUG
+int kld_debug = 0;
+#endif
+
+#define	KLD_LOCK()		sx_xlock(&kld_sx)
+#define	KLD_UNLOCK()		sx_xunlock(&kld_sx)
+#define	KLD_LOCKED()		sx_xlocked(&kld_sx)
+#define	KLD_LOCK_ASSERT() do {						\
+	if (!cold)							\
+		sx_assert(&kld_sx, SX_XLOCKED);				\
+} while (0)
+
+/*
+ * static char *linker_search_path(const char *name, struct mod_depend
+ * *verinfo);
+ */
+static const char 	*linker_basename(const char *path);
+
+/*
+ * Find a currently loaded file given its filename.
+ */
+static linker_file_t linker_find_file_by_name(const char* _filename);
+
+/*
+ * Find a currently loaded file given its file id.
+ */
+static linker_file_t linker_find_file_by_id(int _fileid);
+#endif /* __rtems__ */
+
+/* Metadata from the static kernel */
+SET_DECLARE(modmetadata_set, struct mod_metadata);
+
+#ifndef __rtems__
+MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
+
+linker_file_t linker_kernel_file;
+
+static struct sx kld_sx;	/* kernel linker lock */
+
+/*
+ * Load counter used by clients to determine if a linker file has been
+ * re-loaded. This counter is incremented for each file load.
+ */
+static int loadcnt;
+
+static linker_class_list_t classes;
+static linker_file_list_t linker_files;
+static int next_file_id = 1;
+static int linker_no_more_classes = 0;
+
+#define	LINKER_GET_NEXT_FILE_ID(a) do {					\
+	linker_file_t lftmp;						\
+									\
+	KLD_LOCK_ASSERT();						\
+retry:									\
+	TAILQ_FOREACH(lftmp, &linker_files, link) {			\
+		if (next_file_id == lftmp->id) {			\
+			next_file_id++;					\
+			goto retry;					\
+		}							\
+	}								\
+	(a) = next_file_id;						\
+} while(0)
+
+
+/* XXX wrong name; we're looking at version provision tags here, not modules */
+typedef TAILQ_HEAD(, modlist) modlisthead_t;
+struct modlist {
+	TAILQ_ENTRY(modlist) link;	/* chain together all modules */
+	linker_file_t   container;
+	const char 	*name;
+	int             version;
+};
+typedef struct modlist *modlist_t;
+static modlisthead_t found_modules;
+
+static int	linker_file_add_dependency(linker_file_t file,
+		    linker_file_t dep);
+static caddr_t	linker_file_lookup_symbol_internal(linker_file_t file,
+		    const char* name, int deps);
+static int	linker_load_module(const char *kldname,
+		    const char *modname, struct linker_file *parent,
+		    struct mod_depend *verinfo, struct linker_file **lfpp);
+static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo);
+
+static char *
+linker_strdup(const char *str)
+{
+	char *result;
+
+	if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
+		strcpy(result, str);
+	return (result);
+}
+
+static void
+linker_init(void *arg)
+{
+
+	sx_init(&kld_sx, "kernel linker");
+	TAILQ_INIT(&classes);
+	TAILQ_INIT(&linker_files);
+}
+
+SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0);
+
+static void
+linker_stop_class_add(void *arg)
+{
+
+	linker_no_more_classes = 1;
+}
+
+SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL);
+
+int
+linker_add_class(linker_class_t lc)
+{
+
+	/*
+	 * We disallow any class registration past SI_ORDER_ANY
+	 * of SI_SUB_KLD.  We bump the reference count to keep the
+	 * ops from being freed.
+	 */
+	if (linker_no_more_classes == 1)
+		return (EPERM);
+	kobj_class_compile((kobj_class_t) lc);
+	((kobj_class_t)lc)->refs++;	/* XXX: kobj_mtx */
+	TAILQ_INSERT_TAIL(&classes, lc, link);
+	return (0);
+}
+
+static void
+linker_file_sysinit(linker_file_t lf)
+{
+	struct sysinit **start, **stop, **sipp, **xipp, *save;
+
+	KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
+	    lf->filename));
+
+	if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
+		return;
+	/*
+	 * Perform a bubble sort of the system initialization objects by
+	 * their subsystem (primary key) and order (secondary key).
+	 *
+	 * Since some things care about execution order, this is the operation
+	 * which ensures continued function.
+	 */
+	for (sipp = start; sipp < stop; sipp++) {
+		for (xipp = sipp + 1; xipp < stop; xipp++) {
+			if ((*sipp)->subsystem < (*xipp)->subsystem ||
+			    ((*sipp)->subsystem == (*xipp)->subsystem &&
+			    (*sipp)->order <= (*xipp)->order))
+				continue;	/* skip */
+			save = *sipp;
+			*sipp = *xipp;
+			*xipp = save;
+		}
+	}
+
+	/*
+	 * Traverse the (now) ordered list of system initialization tasks.
+	 * Perform each task, and continue on to the next task.
+	 */
+	mtx_lock(&Giant);
+	for (sipp = start; sipp < stop; sipp++) {
+		if ((*sipp)->subsystem == SI_SUB_DUMMY)
+			continue;	/* skip dummy task(s) */
+
+		/* Call function */
+		(*((*sipp)->func)) ((*sipp)->udata);
+	}
+	mtx_unlock(&Giant);
+}
+
+static void
+linker_file_sysuninit(linker_file_t lf)
+{
+	struct sysinit **start, **stop, **sipp, **xipp, *save;
+
+	KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
+	    lf->filename));
+
+	if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
+	    NULL) != 0)
+		return;
+
+	/*
+	 * Perform a reverse bubble sort of the system initialization objects
+	 * by their subsystem (primary key) and order (secondary key).
+	 *
+	 * Since some things care about execution order, this is the operation
+	 * which ensures continued function.
+	 */
+	for (sipp = start; sipp < stop; sipp++) {
+		for (xipp = sipp + 1; xipp < stop; xipp++) {
+			if ((*sipp)->subsystem > (*xipp)->subsystem ||
+			    ((*sipp)->subsystem == (*xipp)->subsystem &&
+			    (*sipp)->order >= (*xipp)->order))
+				continue;	/* skip */
+			save = *sipp;
+			*sipp = *xipp;
+			*xipp = save;
+		}
+	}
+
+	/*
+	 * Traverse the (now) ordered list of system initialization tasks.
+	 * Perform each task, and continue on to the next task.
+	 */
+	mtx_lock(&Giant);
+	for (sipp = start; sipp < stop; sipp++) {
+		if ((*sipp)->subsystem == SI_SUB_DUMMY)
+			continue;	/* skip dummy task(s) */
+
+		/* Call function */
+		(*((*sipp)->func)) ((*sipp)->udata);
+	}
+	mtx_unlock(&Giant);
+}
+
+static void
+linker_file_register_sysctls(linker_file_t lf)
+{
+	struct sysctl_oid **start, **stop, **oidp;
+
+	KLD_DPF(FILE,
+	    ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
+	    lf->filename));
+
+	if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
+		return;
+
+	sysctl_lock();
+	for (oidp = start; oidp < stop; oidp++)
+		sysctl_register_oid(*oidp);
+	sysctl_unlock();
+}
+
+static void
+linker_file_unregister_sysctls(linker_file_t lf)
+{
+	struct sysctl_oid **start, **stop, **oidp;
+
+	KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs"
+	    " for %s\n", lf->filename));
+
+	if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
+		return;
+
+	sysctl_lock();
+	for (oidp = start; oidp < stop; oidp++)
+		sysctl_unregister_oid(*oidp);
+	sysctl_unlock();
+}
+#endif /* __rtems__ */
+
+static int
+linker_file_register_modules(linker_file_t lf)
+{
+	struct mod_metadata **start, **stop, **mdp;
+	const moduledata_t *moddata;
+	int first_error, error;
+
+	KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
+	    " in %s\n", lf->filename));
+
+#ifndef __rtems__
+	if (linker_file_lookup_set(lf, "modmetadata_set", &start,
+	    &stop, NULL) != 0) {
+		/*
+		 * This fallback should be unnecessary, but if we get booted
+		 * from boot2 instead of loader and we are missing our
+		 * metadata then we have to try the best we can.
+		 */
+		if (lf == linker_kernel_file) {
+			start = SET_BEGIN(modmetadata_set);
+			stop = SET_LIMIT(modmetadata_set);
+		} else
+			return (0);
+	}
+#else /* __rtems__ */
+	start = SET_BEGIN(modmetadata_set);
+	stop = SET_LIMIT(modmetadata_set);
+#endif /* __rtems__ */
+	first_error = 0;
+	for (mdp = start; mdp < stop; mdp++) {
+		if ((*mdp)->md_type != MDT_MODULE)
+			continue;
+		moddata = (*mdp)->md_data;
+		KLD_DPF(FILE, ("Registering module %s in %s\n",
+		    moddata->name, lf->filename));
+		error = module_register(moddata, lf);
+		if (error) {
+			printf("Module %s failed to register: %d\n",
+			    moddata->name, error);
+			if (first_error == 0)
+				first_error = error;
+		}
+	}
+	return (first_error);
+}
+
+static void
+linker_init_kernel_modules(void)
+{
+
+#ifndef __rtems__
+	linker_file_register_modules(linker_kernel_file);
+#else /* __rtems__ */
+	linker_file_register_modules(NULL);
+#endif /* __rtems__ */
+}
+
+SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,
+    0);
+
+#ifndef __rtems__
+static int
+linker_load_file(const char *filename, linker_file_t *result)
+{
+	linker_class_t lc;
+	linker_file_t lf;
+	int foundfile, error;
+
+	/* Refuse to load modules if securelevel raised */
+	if (prison0.pr_securelevel > 0)
+		return (EPERM);
+
+	KLD_LOCK_ASSERT();
+	lf = linker_find_file_by_name(filename);
+	if (lf) {
+		KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
+		    " incrementing refs\n", filename));
+		*result = lf;
+		lf->refs++;
+		return (0);
+	}
+	foundfile = 0;
+	error = 0;
+
+	/*
+	 * We do not need to protect (lock) classes here because there is
+	 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
+	 * and there is no class deregistration mechanism at this time.
+	 */
+	TAILQ_FOREACH(lc, &classes, link) {
+		KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
+		    filename));
+		error = LINKER_LOAD_FILE(lc, filename, &lf);
+		/*
+		 * If we got something other than ENOENT, then it exists but
+		 * we cannot load it for some other reason.
+		 */
+		if (error != ENOENT)
+			foundfile = 1;
+		if (lf) {
+			error = linker_file_register_modules(lf);
+			if (error == EEXIST) {
+				linker_file_unload(lf, LINKER_UNLOAD_FORCE);
+				return (error);
+			}
+			KLD_UNLOCK();
+			linker_file_register_sysctls(lf);
+			linker_file_sysinit(lf);
+			KLD_LOCK();
+			lf->flags |= LINKER_FILE_LINKED;
+			*result = lf;
+			return (0);
+		}
+	}
+	/*
+	 * Less than ideal, but tells the user whether it failed to load or
+	 * the module was not found.
+	 */
+	if (foundfile) {
+
+		/*
+		 * If the file type has not been recognized by the last try
+		 * printout a message before to fail.
+		 */
+		if (error == ENOSYS)
+			printf("linker_load_file: Unsupported file type\n");
+
+		/*
+		 * Format not recognized or otherwise unloadable.
+		 * When loading a module that is statically built into
+		 * the kernel EEXIST percolates back up as the return
+		 * value.  Preserve this so that apps like sysinstall
+		 * can recognize this special case and not post bogus
+		 * dialog boxes.
+		 */
+		if (error != EEXIST)
+			error = ENOEXEC;
+	} else
+		error = ENOENT;		/* Nothing found */
+	return (error);
+}
+
+int
+linker_reference_module(const char *modname, struct mod_depend *verinfo,
+    linker_file_t *result)
+{
+	modlist_t mod;
+	int error;
+
+	KLD_LOCK();
+	if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
+		*result = mod->container;
+		(*result)->refs++;
+		KLD_UNLOCK();
+		return (0);
+	}
+
+	error = linker_load_module(NULL, modname, NULL, verinfo, result);
+	KLD_UNLOCK();
+	return (error);
+}
+
+int
+linker_release_module(const char *modname, struct mod_depend *verinfo,
+    linker_file_t lf)
+{
+	modlist_t mod;
+	int error;
+
+	KLD_LOCK();
+	if (lf == NULL) {
+		KASSERT(modname != NULL,
+		    ("linker_release_module: no file or name"));
+		mod = modlist_lookup2(modname, verinfo);
+		if (mod == NULL) {
+			KLD_UNLOCK();
+			return (ESRCH);
+		}
+		lf = mod->container;
+	} else
+		KASSERT(modname == NULL && verinfo == NULL,
+		    ("linker_release_module: both file and name"));
+	error =	linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
+	KLD_UNLOCK();
+	return (error);
+}
+
+static linker_file_t
+linker_find_file_by_name(const char *filename)
+{
+	linker_file_t lf;
+	char *koname;
+
+	koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
+	sprintf(koname, "%s.ko", filename);
+
+	KLD_LOCK_ASSERT();
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		if (strcmp(lf->filename, koname) == 0)
+			break;
+		if (strcmp(lf->filename, filename) == 0)
+			break;
+	}
+	free(koname, M_LINKER);
+	return (lf);
+}
+
+static linker_file_t
+linker_find_file_by_id(int fileid)
+{
+	linker_file_t lf;
+
+	KLD_LOCK_ASSERT();
+	TAILQ_FOREACH(lf, &linker_files, link)
+		if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
+			break;
+	return (lf);
+}
+
+int
+linker_file_foreach(linker_predicate_t *predicate, void *context)
+{
+	linker_file_t lf;
+	int retval = 0;
+
+	KLD_LOCK();
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		retval = predicate(lf, context);
+		if (retval != 0)
+			break;
+	}
+	KLD_UNLOCK();
+	return (retval);
+}
+
+linker_file_t
+linker_make_file(const char *pathname, linker_class_t lc)
+{
+	linker_file_t lf;
+	const char *filename;
+
+	KLD_LOCK_ASSERT();
+	filename = linker_basename(pathname);
+
+	KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
+	lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
+	if (lf == NULL)
+		return (NULL);
+	lf->refs = 1;
+	lf->userrefs = 0;
+	lf->flags = 0;
+	lf->filename = linker_strdup(filename);
+	lf->pathname = linker_strdup(pathname);
+	LINKER_GET_NEXT_FILE_ID(lf->id);
+	lf->ndeps = 0;
+	lf->deps = NULL;
+	lf->loadcnt = ++loadcnt;
+	lf->sdt_probes = NULL;
+	lf->sdt_nprobes = 0;
+	STAILQ_INIT(&lf->common);
+	TAILQ_INIT(&lf->modules);
+	TAILQ_INSERT_TAIL(&linker_files, lf, link);
+	return (lf);
+}
+
+int
+linker_file_unload(linker_file_t file, int flags)
+{
+	module_t mod, next;
+	modlist_t ml, nextml;
+	struct common_symbol *cp;
+	int error, i;
+
+	/* Refuse to unload modules if securelevel raised. */
+	if (prison0.pr_securelevel > 0)
+		return (EPERM);
+
+	KLD_LOCK_ASSERT();
+	KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
+
+	/* Easy case of just dropping a reference. */
+	if (file->refs > 1) {
+		file->refs--;
+		return (0);
+	}
+
+	KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
+	    " informing modules\n"));
+
+	/*
+	 * Quiesce all the modules to give them a chance to veto the unload.
+	 */
+	MOD_SLOCK;
+	for (mod = TAILQ_FIRST(&file->modules); mod;
+	     mod = module_getfnext(mod)) {
+
+		error = module_quiesce(mod);
+		if (error != 0 && flags != LINKER_UNLOAD_FORCE) {
+			KLD_DPF(FILE, ("linker_file_unload: module %s"
+			    " vetoed unload\n", module_getname(mod)));
+			/*
+			 * XXX: Do we need to tell all the quiesced modules
+			 * that they can resume work now via a new module
+			 * event?
+			 */
+			MOD_SUNLOCK;
+			return (error);
+		}
+	}
+	MOD_SUNLOCK;
+
+	/*
+	 * Inform any modules associated with this file that they are
+	 * being be unloaded.
+	 */
+	MOD_XLOCK;
+	for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
+		next = module_getfnext(mod);
+		MOD_XUNLOCK;
+
+		/*
+		 * Give the module a chance to veto the unload.
+		 */
+		if ((error = module_unload(mod)) != 0) {
+			KLD_DPF(FILE, ("linker_file_unload: module %s"
+			    " failed unload\n", mod));
+			return (error);
+		}
+		MOD_XLOCK;
+		module_release(mod);
+	}
+	MOD_XUNLOCK;
+
+	TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
+		if (ml->container == file) {
+			TAILQ_REMOVE(&found_modules, ml, link);
+			free(ml, M_LINKER);
+		}
+	}
+
+	/*
+	 * Don't try to run SYSUNINITs if we are unloaded due to a
+	 * link error.
+	 */
+	if (file->flags & LINKER_FILE_LINKED) {
+		file->flags &= ~LINKER_FILE_LINKED;
+		KLD_UNLOCK();
+		linker_file_sysuninit(file);
+		linker_file_unregister_sysctls(file);
+		KLD_LOCK();
+	}
+	TAILQ_REMOVE(&linker_files, file, link);
+
+	if (file->deps) {
+		for (i = 0; i < file->ndeps; i++)
+			linker_file_unload(file->deps[i], flags);
+		free(file->deps, M_LINKER);
+		file->deps = NULL;
+	}
+	while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
+		STAILQ_REMOVE_HEAD(&file->common, link);
+		free(cp, M_LINKER);
+	}
+
+	LINKER_UNLOAD(file);
+	if (file->filename) {
+		free(file->filename, M_LINKER);
+		file->filename = NULL;
+	}
+	if (file->pathname) {
+		free(file->pathname, M_LINKER);
+		file->pathname = NULL;
+	}
+	kobj_delete((kobj_t) file, M_LINKER);
+	return (0);
+}
+
+int
+linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
+{
+	return (LINKER_CTF_GET(file, lc));
+}
+
+static int
+linker_file_add_dependency(linker_file_t file, linker_file_t dep)
+{
+	linker_file_t *newdeps;
+
+	KLD_LOCK_ASSERT();
+	newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *),
+	    M_LINKER, M_WAITOK | M_ZERO);
+	if (newdeps == NULL)
+		return (ENOMEM);
+
+	if (file->deps) {
+		bcopy(file->deps, newdeps,
+		    file->ndeps * sizeof(linker_file_t *));
+		free(file->deps, M_LINKER);
+	}
+	file->deps = newdeps;
+	file->deps[file->ndeps] = dep;
+	file->ndeps++;
+	return (0);
+}
+
+/*
+ * Locate a linker set and its contents.  This is a helper function to avoid
+ * linker_if.h exposure elsewhere.  Note: firstp and lastp are really void **.
+ * This function is used in this file so we can avoid having lots of (void **)
+ * casts.
+ */
+int
+linker_file_lookup_set(linker_file_t file, const char *name,
+    void *firstp, void *lastp, int *countp)
+{
+	int error, locked;
+
+	locked = KLD_LOCKED();
+	if (!locked)
+		KLD_LOCK();
+	error = LINKER_LOOKUP_SET(file, name, firstp, lastp, countp);
+	if (!locked)
+		KLD_UNLOCK();
+	return (error);
+}
+
+/*
+ * List all functions in a file.
+ */
+int
+linker_file_function_listall(linker_file_t lf,
+    linker_function_nameval_callback_t callback_func, void *arg)
+{
+	return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
+}
+
+caddr_t
+linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
+{
+	caddr_t sym;
+	int locked;
+
+	locked = KLD_LOCKED();
+	if (!locked)
+		KLD_LOCK();
+	sym = linker_file_lookup_symbol_internal(file, name, deps);
+	if (!locked)
+		KLD_UNLOCK();
+	return (sym);
+}
+
+static caddr_t
+linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
+    int deps)
+{
+	c_linker_sym_t sym;
+	linker_symval_t symval;
+	caddr_t address;
+	size_t common_size = 0;
+	int i;
+
+	KLD_LOCK_ASSERT();
+	KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
+	    file, name, deps));
+
+	if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
+		LINKER_SYMBOL_VALUES(file, sym, &symval);
+		if (symval.value == 0)
+			/*
+			 * For commons, first look them up in the
+			 * dependencies and only allocate space if not found
+			 * there.
+			 */
+			common_size = symval.size;
+		else {
+			KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
+			    ".value=%p\n", symval.value));
+			return (symval.value);
+		}
+	}
+	if (deps) {
+		for (i = 0; i < file->ndeps; i++) {
+			address = linker_file_lookup_symbol_internal(
+			    file->deps[i], name, 0);
+			if (address) {
+				KLD_DPF(SYM, ("linker_file_lookup_symbol:"
+				    " deps value=%p\n", address));
+				return (address);
+			}
+		}
+	}
+	if (common_size > 0) {
+		/*
+		 * This is a common symbol which was not found in the
+		 * dependencies.  We maintain a simple common symbol table in
+		 * the file object.
+		 */
+		struct common_symbol *cp;
+
+		STAILQ_FOREACH(cp, &file->common, link) {
+			if (strcmp(cp->name, name) == 0) {
+				KLD_DPF(SYM, ("linker_file_lookup_symbol:"
+				    " old common value=%p\n", cp->address));
+				return (cp->address);
+			}
+		}
+		/*
+		 * Round the symbol size up to align.
+		 */
+		common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
+		cp = malloc(sizeof(struct common_symbol)
+		    + common_size + strlen(name) + 1, M_LINKER,
+		    M_WAITOK | M_ZERO);
+		cp->address = (caddr_t)(cp + 1);
+		cp->name = cp->address + common_size;
+		strcpy(cp->name, name);
+		bzero(cp->address, common_size);
+		STAILQ_INSERT_TAIL(&file->common, cp, link);
+
+		KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
+		    " value=%p\n", cp->address));
+		return (cp->address);
+	}
+	KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
+	return (0);
+}
+
+/*
+ * Both DDB and stack(9) rely on the kernel linker to provide forward and
+ * backward lookup of symbols.  However, DDB and sometimes stack(9) need to
+ * do this in a lockfree manner.  We provide a set of internal helper
+ * routines to perform these operations without locks, and then wrappers that
+ * optionally lock.
+ *
+ * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
+ */
+#ifdef DDB
+static int
+linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
+{
+	linker_file_t lf;
+
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
+			return (0);
+	}
+	return (ENOENT);
+}
+#endif
+
+static int
+linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
+{
+	linker_file_t lf;
+	c_linker_sym_t best, es;
+	u_long diff, bestdiff, off;
+
+	best = 0;
+	off = (uintptr_t)value;
+	bestdiff = off;
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
+			continue;
+		if (es != 0 && diff < bestdiff) {
+			best = es;
+			bestdiff = diff;
+		}
+		if (bestdiff == 0)
+			break;
+	}
+	if (best) {
+		*sym = best;
+		*diffp = bestdiff;
+		return (0);
+	} else {
+		*sym = 0;
+		*diffp = off;
+		return (ENOENT);
+	}
+}
+
+static int
+linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
+{
+	linker_file_t lf;
+
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
+			return (0);
+	}
+	return (ENOENT);
+}
+
+static int
+linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
+    long *offset)
+{
+	linker_symval_t symval;
+	c_linker_sym_t sym;
+	int error;
+
+	*offset = 0;
+	error = linker_debug_search_symbol(value, &sym, offset);
+	if (error)
+		return (error);
+	error = linker_debug_symbol_values(sym, &symval);
+	if (error)
+		return (error);
+	strlcpy(buf, symval.name, buflen);
+	return (0);
+}
+
+/*
+ * DDB Helpers.  DDB has to look across multiple files with their own symbol
+ * tables and string tables.
+ *
+ * Note that we do not obey list locking protocols here.  We really don't need
+ * DDB to hang because somebody's got the lock held.  We'll take the chance
+ * that the files list is inconsistant instead.
+ */
+#ifdef DDB
+int
+linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
+{
+
+	return (linker_debug_lookup(symstr, sym));
+}
+#endif
+
+int
+linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
+{
+
+	return (linker_debug_search_symbol(value, sym, diffp));
+}
+
+int
+linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
+{
+
+	return (linker_debug_symbol_values(sym, symval));
+}
+
+int
+linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
+    long *offset)
+{
+
+	return (linker_debug_search_symbol_name(value, buf, buflen, offset));
+}
+
+/*
+ * stack(9) helper for non-debugging environemnts.  Unlike DDB helpers, we do
+ * obey locking protocols, and offer a significantly less complex interface.
+ */
+int
+linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
+    long *offset)
+{
+	int error;
+
+	KLD_LOCK();
+	error = linker_debug_search_symbol_name(value, buf, buflen, offset);
+	KLD_UNLOCK();
+	return (error);
+}
+
+/*
+ * Syscalls.
+ */
+int
+kern_kldload(struct thread *td, const char *file, int *fileid)
+{
+#ifdef HWPMC_HOOKS
+	struct pmckern_map_in pkm;
+#endif
+	const char *kldname, *modname;
+	linker_file_t lf;
+	int error;
+
+	if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
+		return (error);
+
+	if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
+		return (error);
+
+	/*
+	 * It is possible that kldloaded module will attach a new ifnet,
+	 * so vnet context must be set when this ocurs.
+	 */
+	CURVNET_SET(TD_TO_VNET(td));
+
+	/*
+	 * If file does not contain a qualified name or any dot in it
+	 * (kldname.ko, or kldname.ver.ko) treat it as an interface
+	 * name.
+	 */
+	if (index(file, '/') || index(file, '.')) {
+		kldname = file;
+		modname = NULL;
+	} else {
+		kldname = NULL;
+		modname = file;
+	}
+
+	KLD_LOCK();
+	error = linker_load_module(kldname, modname, NULL, NULL, &lf);
+	if (error)
+		goto unlock;
+#ifdef HWPMC_HOOKS
+	pkm.pm_file = lf->filename;
+	pkm.pm_address = (uintptr_t) lf->address;
+	PMC_CALL_HOOK(td, PMC_FN_KLD_LOAD, (void *) &pkm);
+#endif
+	lf->userrefs++;
+	if (fileid != NULL)
+		*fileid = lf->id;
+unlock:
+	KLD_UNLOCK();
+	CURVNET_RESTORE();
+	return (error);
+}
+
+int
+kldload(struct thread *td, struct kldload_args *uap)
+{
+	char *pathname = NULL;
+	int error, fileid;
+
+	td->td_retval[0] = -1;
+
+	pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
+	error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
+	if (error == 0) {
+		error = kern_kldload(td, pathname, &fileid);
+		if (error == 0)
+			td->td_retval[0] = fileid;
+	}
+	free(pathname, M_TEMP);
+	return (error);
+}
+
+int
+kern_kldunload(struct thread *td, int fileid, int flags)
+{
+#ifdef HWPMC_HOOKS
+	struct pmckern_map_out pkm;
+#endif
+	linker_file_t lf;
+	int error = 0;
+
+	if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
+		return (error);
+
+	if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
+		return (error);
+
+	CURVNET_SET(TD_TO_VNET(td));
+	KLD_LOCK();
+	lf = linker_find_file_by_id(fileid);
+	if (lf) {
+		KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
+
+		/* Check if there are DTrace probes enabled on this file. */
+		if (lf->nenabled > 0) {
+			printf("kldunload: attempt to unload file that has"
+			    " DTrace probes enabled\n");
+			error = EBUSY;
+		} else if (lf->userrefs == 0) {
+			/*
+			 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
+			 */
+			printf("kldunload: attempt to unload file that was"
+			    " loaded by the kernel\n");
+			error = EBUSY;
+		} else {
+#ifdef HWPMC_HOOKS
+			/* Save data needed by hwpmc(4) before unloading. */
+			pkm.pm_address = (uintptr_t) lf->address;
+			pkm.pm_size = lf->size;
+#endif
+			lf->userrefs--;
+			error = linker_file_unload(lf, flags);
+			if (error)
+				lf->userrefs++;
+		}
+	} else
+		error = ENOENT;
+
+#ifdef HWPMC_HOOKS
+	if (error == 0)
+		PMC_CALL_HOOK(td, PMC_FN_KLD_UNLOAD, (void *) &pkm);
+#endif
+	KLD_UNLOCK();
+	CURVNET_RESTORE();
+	return (error);
+}
+
+int
+kldunload(struct thread *td, struct kldunload_args *uap)
+{
+
+	return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
+}
+
+int
+kldunloadf(struct thread *td, struct kldunloadf_args *uap)
+{
+
+	if (uap->flags != LINKER_UNLOAD_NORMAL &&
+	    uap->flags != LINKER_UNLOAD_FORCE)
+		return (EINVAL);
+	return (kern_kldunload(td, uap->fileid, uap->flags));
+}
+
+int
+kldfind(struct thread *td, struct kldfind_args *uap)
+{
+	char *pathname;
+	const char *filename;
+	linker_file_t lf;
+	int error;
+
+#ifdef MAC
+	error = mac_kld_check_stat(td->td_ucred);
+	if (error)
+		return (error);
+#endif
+
+	td->td_retval[0] = -1;
+
+	pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
+	if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
+		goto out;
+
+	filename = linker_basename(pathname);
+	KLD_LOCK();
+	lf = linker_find_file_by_name(filename);
+	if (lf)
+		td->td_retval[0] = lf->id;
+	else
+		error = ENOENT;
+	KLD_UNLOCK();
+out:
+	free(pathname, M_TEMP);
+	return (error);
+}
+
+int
+kldnext(struct thread *td, struct kldnext_args *uap)
+{
+	linker_file_t lf;
+	int error = 0;
+
+#ifdef MAC
+	error = mac_kld_check_stat(td->td_ucred);
+	if (error)
+		return (error);
+#endif
+
+	KLD_LOCK();
+	if (uap->fileid == 0)
+		lf = TAILQ_FIRST(&linker_files);
+	else {
+		lf = linker_find_file_by_id(uap->fileid);
+		if (lf == NULL) {
+			error = ENOENT;
+			goto out;
+		}
+		lf = TAILQ_NEXT(lf, link);
+	}
+
+	/* Skip partially loaded files. */
+	while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
+		lf = TAILQ_NEXT(lf, link);
+
+	if (lf)
+		td->td_retval[0] = lf->id;
+	else
+		td->td_retval[0] = 0;
+out:
+	KLD_UNLOCK();
+	return (error);
+}
+
+int
+kldstat(struct thread *td, struct kldstat_args *uap)
+{
+	struct kld_file_stat stat;
+	linker_file_t lf;
+	int error, namelen, version, version_num;
+
+	/*
+	 * Check the version of the user's structure.
+	 */
+	if ((error = copyin(&uap->stat->version, &version, sizeof(version))) != 0)
+		return (error);
+	if (version == sizeof(struct kld_file_stat_1))
+		version_num = 1;
+	else if (version == sizeof(struct kld_file_stat))
+		version_num = 2;
+	else
+		return (EINVAL);
+
+#ifdef MAC
+	error = mac_kld_check_stat(td->td_ucred);
+	if (error)
+		return (error);
+#endif
+
+	KLD_LOCK();
+	lf = linker_find_file_by_id(uap->fileid);
+	if (lf == NULL) {
+		KLD_UNLOCK();
+		return (ENOENT);
+	}
+
+	/* Version 1 fields: */
+	namelen = strlen(lf->filename) + 1;
+	if (namelen > MAXPATHLEN)
+		namelen = MAXPATHLEN;
+	bcopy(lf->filename, &stat.name[0], namelen);
+	stat.refs = lf->refs;
+	stat.id = lf->id;
+	stat.address = lf->address;
+	stat.size = lf->size;
+	if (version_num > 1) {
+		/* Version 2 fields: */
+		namelen = strlen(lf->pathname) + 1;
+		if (namelen > MAXPATHLEN)
+			namelen = MAXPATHLEN;
+		bcopy(lf->pathname, &stat.pathname[0], namelen);
+	}
+	KLD_UNLOCK();
+
+	td->td_retval[0] = 0;
+
+	return (copyout(&stat, uap->stat, version));
+}
+
+int
+kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
+{
+	linker_file_t lf;
+	module_t mp;
+	int error = 0;
+
+#ifdef MAC
+	error = mac_kld_check_stat(td->td_ucred);
+	if (error)
+		return (error);
+#endif
+
+	KLD_LOCK();
+	lf = linker_find_file_by_id(uap->fileid);
+	if (lf) {
+		MOD_SLOCK;
+		mp = TAILQ_FIRST(&lf->modules);
+		if (mp != NULL)
+			td->td_retval[0] = module_getid(mp);
+		else
+			td->td_retval[0] = 0;
+		MOD_SUNLOCK;
+	} else
+		error = ENOENT;
+	KLD_UNLOCK();
+	return (error);
+}
+
+int
+kldsym(struct thread *td, struct kldsym_args *uap)
+{
+	char *symstr = NULL;
+	c_linker_sym_t sym;
+	linker_symval_t symval;
+	linker_file_t lf;
+	struct kld_sym_lookup lookup;
+	int error = 0;
+
+#ifdef MAC
+	error = mac_kld_check_stat(td->td_ucred);
+	if (error)
+		return (error);
+#endif
+
+	if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
+		return (error);
+	if (lookup.version != sizeof(lookup) ||
+	    uap->cmd != KLDSYM_LOOKUP)
+		return (EINVAL);
+	symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
+	if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
+		goto out;
+	KLD_LOCK();
+	if (uap->fileid != 0) {
+		lf = linker_find_file_by_id(uap->fileid);
+		if (lf == NULL)
+			error = ENOENT;
+		else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
+		    LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
+			lookup.symvalue = (uintptr_t) symval.value;
+			lookup.symsize = symval.size;
+			error = copyout(&lookup, uap->data, sizeof(lookup));
+		} else
+			error = ENOENT;
+	} else {
+		TAILQ_FOREACH(lf, &linker_files, link) {
+			if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
+			    LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
+				lookup.symvalue = (uintptr_t)symval.value;
+				lookup.symsize = symval.size;
+				error = copyout(&lookup, uap->data,
+				    sizeof(lookup));
+				break;
+			}
+		}
+		if (lf == NULL)
+			error = ENOENT;
+	}
+	KLD_UNLOCK();
+out:
+	free(symstr, M_TEMP);
+	return (error);
+}
+
+/*
+ * Preloaded module support
+ */
+
+static modlist_t
+modlist_lookup(const char *name, int ver)
+{
+	modlist_t mod;
+
+	TAILQ_FOREACH(mod, &found_modules, link) {
+		if (strcmp(mod->name, name) == 0 &&
+		    (ver == 0 || mod->version == ver))
+			return (mod);
+	}
+	return (NULL);
+}
+
+static modlist_t
+modlist_lookup2(const char *name, struct mod_depend *verinfo)
+{
+	modlist_t mod, bestmod;
+	int ver;
+
+	if (verinfo == NULL)
+		return (modlist_lookup(name, 0));
+	bestmod = NULL;
+	TAILQ_FOREACH(mod, &found_modules, link) {
+		if (strcmp(mod->name, name) != 0)
+			continue;
+		ver = mod->version;
+		if (ver == verinfo->md_ver_preferred)
+			return (mod);
+		if (ver >= verinfo->md_ver_minimum &&
+		    ver <= verinfo->md_ver_maximum &&
+		    (bestmod == NULL || ver > bestmod->version))
+			bestmod = mod;
+	}
+	return (bestmod);
+}
+
+static modlist_t
+modlist_newmodule(const char *modname, int version, linker_file_t container)
+{
+	modlist_t mod;
+
+	mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
+	if (mod == NULL)
+		panic("no memory for module list");
+	mod->container = container;
+	mod->name = modname;
+	mod->version = version;
+	TAILQ_INSERT_TAIL(&found_modules, mod, link);
+	return (mod);
+}
+
+static void
+linker_addmodules(linker_file_t lf, struct mod_metadata **start,
+    struct mod_metadata **stop, int preload)
+{
+	struct mod_metadata *mp, **mdp;
+	const char *modname;
+	int ver;
+
+	for (mdp = start; mdp < stop; mdp++) {
+		mp = *mdp;
+		if (mp->md_type != MDT_VERSION)
+			continue;
+		modname = mp->md_cval;
+		ver = ((struct mod_version *)mp->md_data)->mv_version;
+		if (modlist_lookup(modname, ver) != NULL) {
+			printf("module %s already present!\n", modname);
+			/* XXX what can we do? this is a build error. :-( */
+			continue;
+		}
+		modlist_newmodule(modname, ver, lf);
+	}
+}
+
+static void
+linker_preload(void *arg)
+{
+	caddr_t modptr;
+	const char *modname, *nmodname;
+	char *modtype;
+	linker_file_t lf, nlf;
+	linker_class_t lc;
+	int error;
+	linker_file_list_t loaded_files;
+	linker_file_list_t depended_files;
+	struct mod_metadata *mp, *nmp;
+	struct mod_metadata **start, **stop, **mdp, **nmdp;
+	struct mod_depend *verinfo;
+	int nver;
+	int resolves;
+	modlist_t mod;
+	struct sysinit **si_start, **si_stop;
+
+	TAILQ_INIT(&loaded_files);
+	TAILQ_INIT(&depended_files);
+	TAILQ_INIT(&found_modules);
+	error = 0;
+
+	modptr = NULL;
+	while ((modptr = preload_search_next_name(modptr)) != NULL) {
+		modname = (char *)preload_search_info(modptr, MODINFO_NAME);
+		modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
+		if (modname == NULL) {
+			printf("Preloaded module at %p does not have a"
+			    " name!\n", modptr);
+			continue;
+		}
+		if (modtype == NULL) {
+			printf("Preloaded module at %p does not have a type!\n",
+			    modptr);
+			continue;
+		}
+		if (bootverbose)
+			printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
+			    modptr);
+		lf = NULL;
+		TAILQ_FOREACH(lc, &classes, link) {
+			error = LINKER_LINK_PRELOAD(lc, modname, &lf);
+			if (!error)
+				break;
+			lf = NULL;
+		}
+		if (lf)
+			TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
+	}
+
+	/*
+	 * First get a list of stuff in the kernel.
+	 */
+	if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
+	    &stop, NULL) == 0)
+		linker_addmodules(linker_kernel_file, start, stop, 1);
+
+	/*
+	 * This is a once-off kinky bubble sort to resolve relocation
+	 * dependency requirements.
+	 */
+restart:
+	TAILQ_FOREACH(lf, &loaded_files, loaded) {
+		error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
+		    &stop, NULL);
+		/*
+		 * First, look to see if we would successfully link with this
+		 * stuff.
+		 */
+		resolves = 1;	/* unless we know otherwise */
+		if (!error) {
+			for (mdp = start; mdp < stop; mdp++) {
+				mp = *mdp;
+				if (mp->md_type != MDT_DEPEND)
+					continue;
+				modname = mp->md_cval;
+				verinfo = mp->md_data;
+				for (nmdp = start; nmdp < stop; nmdp++) {
+					nmp = *nmdp;
+					if (nmp->md_type != MDT_VERSION)
+						continue;
+					nmodname = nmp->md_cval;
+					if (strcmp(modname, nmodname) == 0)
+						break;
+				}
+				if (nmdp < stop)   /* it's a self reference */
+					continue;
+
+				/*
+				 * ok, the module isn't here yet, we
+				 * are not finished
+				 */
+				if (modlist_lookup2(modname, verinfo) == NULL)
+					resolves = 0;
+			}
+		}
+		/*
+		 * OK, if we found our modules, we can link.  So, "provide"
+		 * the modules inside and add it to the end of the link order
+		 * list.
+		 */
+		if (resolves) {
+			if (!error) {
+				for (mdp = start; mdp < stop; mdp++) {
+					mp = *mdp;
+					if (mp->md_type != MDT_VERSION)
+						continue;
+					modname = mp->md_cval;
+					nver = ((struct mod_version *)
+					    mp->md_data)->mv_version;
+					if (modlist_lookup(modname,
+					    nver) != NULL) {
+						printf("module %s already"
+						    " present!\n", modname);
+						TAILQ_REMOVE(&loaded_files,
+						    lf, loaded);
+						linker_file_unload(lf,
+						    LINKER_UNLOAD_FORCE);
+						/* we changed tailq next ptr */
+						goto restart;
+					}
+					modlist_newmodule(modname, nver, lf);
+				}
+			}
+			TAILQ_REMOVE(&loaded_files, lf, loaded);
+			TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
+			/*
+			 * Since we provided modules, we need to restart the
+			 * sort so that the previous files that depend on us
+			 * have a chance. Also, we've busted the tailq next
+			 * pointer with the REMOVE.
+			 */
+			goto restart;
+		}
+	}
+
+	/*
+	 * At this point, we check to see what could not be resolved..
+	 */
+	while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
+		TAILQ_REMOVE(&loaded_files, lf, loaded);
+		printf("KLD file %s is missing dependencies\n", lf->filename);
+		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
+	}
+
+	/*
+	 * We made it. Finish off the linking in the order we determined.
+	 */
+	TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
+		if (linker_kernel_file) {
+			linker_kernel_file->refs++;
+			error = linker_file_add_dependency(lf,
+			    linker_kernel_file);
+			if (error)
+				panic("cannot add dependency");
+		}
+		lf->userrefs++;	/* so we can (try to) kldunload it */
+		error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
+		    &stop, NULL);
+		if (!error) {
+			for (mdp = start; mdp < stop; mdp++) {
+				mp = *mdp;
+				if (mp->md_type != MDT_DEPEND)
+					continue;
+				modname = mp->md_cval;
+				verinfo = mp->md_data;
+				mod = modlist_lookup2(modname, verinfo);
+				/* Don't count self-dependencies */
+				if (lf == mod->container)
+					continue;
+				mod->container->refs++;
+				error = linker_file_add_dependency(lf,
+				    mod->container);
+				if (error)
+					panic("cannot add dependency");
+			}
+		}
+		/*
+		 * Now do relocation etc using the symbol search paths
+		 * established by the dependencies
+		 */
+		error = LINKER_LINK_PRELOAD_FINISH(lf);
+		if (error) {
+			TAILQ_REMOVE(&depended_files, lf, loaded);
+			printf("KLD file %s - could not finalize loading\n",
+			    lf->filename);
+			linker_file_unload(lf, LINKER_UNLOAD_FORCE);
+			continue;
+		}
+		linker_file_register_modules(lf);
+		if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
+		    &si_stop, NULL) == 0)
+			sysinit_add(si_start, si_stop);
+		linker_file_register_sysctls(lf);
+		lf->flags |= LINKER_FILE_LINKED;
+	}
+	/* woohoo! we made it! */
+}
+
+SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
+
+/*
+ * Search for a not-loaded module by name.
+ *
+ * Modules may be found in the following locations:
+ *
+ * - preloaded (result is just the module name) - on disk (result is full path
+ * to module)
+ *
+ * If the module name is qualified in any way (contains path, etc.) the we
+ * simply return a copy of it.
+ *
+ * The search path can be manipulated via sysctl.  Note that we use the ';'
+ * character as a separator to be consistent with the bootloader.
+ */
+
+static char linker_hintfile[] = "linker.hints";
+static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
+
+SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
+    sizeof(linker_path), "module load search path");
+
+TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
+
+static char *linker_ext_list[] = {
+	"",
+	".ko",
+	NULL
+};
+
+/*
+ * Check if file actually exists either with or without extension listed in
+ * the linker_ext_list. (probably should be generic for the rest of the
+ * kernel)
+ */
+static char *
+linker_lookup_file(const char *path, int pathlen, const char *name,
+    int namelen, struct vattr *vap)
+{
+	struct nameidata nd;
+	struct thread *td = curthread;	/* XXX */
+	char *result, **cpp, *sep;
+	int error, len, extlen, reclen, flags, vfslocked;
+	enum vtype type;
+
+	extlen = 0;
+	for (cpp = linker_ext_list; *cpp; cpp++) {
+		len = strlen(*cpp);
+		if (len > extlen)
+			extlen = len;
+	}
+	extlen++;		/* trailing '\0' */
+	sep = (path[pathlen - 1] != '/') ? "/" : "";
+
+	reclen = pathlen + strlen(sep) + namelen + extlen + 1;
+	result = malloc(reclen, M_LINKER, M_WAITOK);
+	for (cpp = linker_ext_list; *cpp; cpp++) {
+		snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
+		    namelen, name, *cpp);
+		/*
+		 * Attempt to open the file, and return the path if
+		 * we succeed and it's a regular file.
+		 */
+		NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, result, td);
+		flags = FREAD;
+		error = vn_open(&nd, &flags, 0, NULL);
+		if (error == 0) {
+			vfslocked = NDHASGIANT(&nd);
+			NDFREE(&nd, NDF_ONLY_PNBUF);
+			type = nd.ni_vp->v_type;
+			if (vap)
+				VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
+			VOP_UNLOCK(nd.ni_vp, 0);
+			vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
+			VFS_UNLOCK_GIANT(vfslocked);
+			if (type == VREG)
+				return (result);
+		}
+	}
+	free(result, M_LINKER);
+	return (NULL);
+}
+
+#define	INT_ALIGN(base, ptr)	ptr =					\
+	(base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
+
+/*
+ * Lookup KLD which contains requested module in the "linker.hints" file. If
+ * version specification is available, then try to find the best KLD.
+ * Otherwise just find the latest one.
+ */
+static char *
+linker_hints_lookup(const char *path, int pathlen, const char *modname,
+    int modnamelen, struct mod_depend *verinfo)
+{
+	struct thread *td = curthread;	/* XXX */
+	struct ucred *cred = td ? td->td_ucred : NULL;
+	struct nameidata nd;
+	struct vattr vattr, mattr;
+	u_char *hints = NULL;
+	u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
+	int error, ival, bestver, *intp, reclen, found, flags, clen, blen;
+	int vfslocked = 0;
+
+	result = NULL;
+	bestver = found = 0;
+
+	sep = (path[pathlen - 1] != '/') ? "/" : "";
+	reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
+	    strlen(sep) + 1;
+	pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
+	snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
+	    linker_hintfile);
+
+	NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, pathbuf, td);
+	flags = FREAD;
+	error = vn_open(&nd, &flags, 0, NULL);
+	if (error)
+		goto bad;
+	vfslocked = NDHASGIANT(&nd);
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	if (nd.ni_vp->v_type != VREG)
+		goto bad;
+	best = cp = NULL;
+	error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
+	if (error)
+		goto bad;
+	/*
+	 * XXX: we need to limit this number to some reasonable value
+	 */
+	if (vattr.va_size > 100 * 1024) {
+		printf("hints file too large %ld\n", (long)vattr.va_size);
+		goto bad;
+	}
+	hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
+	if (hints == NULL)
+		goto bad;
+	error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
+	    UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
+	if (error)
+		goto bad;
+	VOP_UNLOCK(nd.ni_vp, 0);
+	vn_close(nd.ni_vp, FREAD, cred, td);
+	VFS_UNLOCK_GIANT(vfslocked);
+	nd.ni_vp = NULL;
+	if (reclen != 0) {
+		printf("can't read %d\n", reclen);
+		goto bad;
+	}
+	intp = (int *)hints;
+	ival = *intp++;
+	if (ival != LINKER_HINTS_VERSION) {
+		printf("hints file version mismatch %d\n", ival);
+		goto bad;
+	}
+	bufend = hints + vattr.va_size;
+	recptr = (u_char *)intp;
+	clen = blen = 0;
+	while (recptr < bufend && !found) {
+		intp = (int *)recptr;
+		reclen = *intp++;
+		ival = *intp++;
+		cp = (char *)intp;
+		switch (ival) {
+		case MDT_VERSION:
+			clen = *cp++;
+			if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
+				break;
+			cp += clen;
+			INT_ALIGN(hints, cp);
+			ival = *(int *)cp;
+			cp += sizeof(int);
+			clen = *cp++;
+			if (verinfo == NULL ||
+			    ival == verinfo->md_ver_preferred) {
+				found = 1;
+				break;
+			}
+			if (ival >= verinfo->md_ver_minimum &&
+			    ival <= verinfo->md_ver_maximum &&
+			    ival > bestver) {
+				bestver = ival;
+				best = cp;
+				blen = clen;
+			}
+			break;
+		default:
+			break;
+		}
+		recptr += reclen + sizeof(int);
+	}
+	/*
+	 * Finally check if KLD is in the place
+	 */
+	if (found)
+		result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
+	else if (best)
+		result = linker_lookup_file(path, pathlen, best, blen, &mattr);
+
+	/*
+	 * KLD is newer than hints file. What we should do now?
+	 */
+	if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
+		printf("warning: KLD '%s' is newer than the linker.hints"
+		    " file\n", result);
+bad:
+	free(pathbuf, M_LINKER);
+	if (hints)
+		free(hints, M_TEMP);
+	if (nd.ni_vp != NULL) {
+		VOP_UNLOCK(nd.ni_vp, 0);
+		vn_close(nd.ni_vp, FREAD, cred, td);
+		VFS_UNLOCK_GIANT(vfslocked);
+	}
+	/*
+	 * If nothing found or hints is absent - fallback to the old
+	 * way by using "kldname[.ko]" as module name.
+	 */
+	if (!found && !bestver && result == NULL)
+		result = linker_lookup_file(path, pathlen, modname,
+		    modnamelen, NULL);
+	return (result);
+}
+
+/*
+ * Lookup KLD which contains requested module in the all directories.
+ */
+static char *
+linker_search_module(const char *modname, int modnamelen,
+    struct mod_depend *verinfo)
+{
+	char *cp, *ep, *result;
+
+	/*
+	 * traverse the linker path
+	 */
+	for (cp = linker_path; *cp; cp = ep + 1) {
+		/* find the end of this component */
+		for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
+		result = linker_hints_lookup(cp, ep - cp, modname,
+		    modnamelen, verinfo);
+		if (result != NULL)
+			return (result);
+		if (*ep == 0)
+			break;
+	}
+	return (NULL);
+}
+
+/*
+ * Search for module in all directories listed in the linker_path.
+ */
+static char *
+linker_search_kld(const char *name)
+{
+	char *cp, *ep, *result;
+	int len;
+
+	/* qualified at all? */
+	if (index(name, '/'))
+		return (linker_strdup(name));
+
+	/* traverse the linker path */
+	len = strlen(name);
+	for (ep = linker_path; *ep; ep++) {
+		cp = ep;
+		/* find the end of this component */
+		for (; *ep != 0 && *ep != ';'; ep++);
+		result = linker_lookup_file(cp, ep - cp, name, len, NULL);
+		if (result != NULL)
+			return (result);
+	}
+	return (NULL);
+}
+
+static const char *
+linker_basename(const char *path)
+{
+	const char *filename;
+
+	filename = rindex(path, '/');
+	if (filename == NULL)
+		return path;
+	if (filename[1])
+		filename++;
+	return (filename);
+}
+
+#ifdef HWPMC_HOOKS
+/*
+ * Inform hwpmc about the set of kernel modules currently loaded.
+ */
+void *
+linker_hwpmc_list_objects(void)
+{
+	linker_file_t lf;
+	struct pmckern_map_in *kobase;
+	int i, nmappings;
+
+	nmappings = 0;
+	KLD_LOCK();
+	TAILQ_FOREACH(lf, &linker_files, link)
+		nmappings++;
+
+	/* Allocate nmappings + 1 entries. */
+	kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
+	    M_LINKER, M_WAITOK | M_ZERO);
+	i = 0;
+	TAILQ_FOREACH(lf, &linker_files, link) {
+
+		/* Save the info for this linker file. */
+		kobase[i].pm_file = lf->filename;
+		kobase[i].pm_address = (uintptr_t)lf->address;
+		i++;
+	}
+	KLD_UNLOCK();
+
+	KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"));
+
+	/* The last entry of the malloced area comprises of all zeros. */
+	KASSERT(kobase[i].pm_file == NULL,
+	    ("linker_hwpmc_list_objects: last object not NULL"));
+
+	return ((void *)kobase);
+}
+#endif
+
+/*
+ * Find a file which contains given module and load it, if "parent" is not
+ * NULL, register a reference to it.
+ */
+static int
+linker_load_module(const char *kldname, const char *modname,
+    struct linker_file *parent, struct mod_depend *verinfo,
+    struct linker_file **lfpp)
+{
+	linker_file_t lfdep;
+	const char *filename;
+	char *pathname;
+	int error;
+
+	KLD_LOCK_ASSERT();
+	if (modname == NULL) {
+		/*
+ 		 * We have to load KLD
+ 		 */
+		KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
+		    " is not NULL"));
+		pathname = linker_search_kld(kldname);
+	} else {
+		if (modlist_lookup2(modname, verinfo) != NULL)
+			return (EEXIST);
+		if (kldname != NULL)
+			pathname = linker_strdup(kldname);
+		else if (rootvnode == NULL)
+			pathname = NULL;
+		else
+			/*
+			 * Need to find a KLD with required module
+			 */
+			pathname = linker_search_module(modname,
+			    strlen(modname), verinfo);
+	}
+	if (pathname == NULL)
+		return (ENOENT);
+
+	/*
+	 * Can't load more than one file with the same basename XXX:
+	 * Actually it should be possible to have multiple KLDs with
+	 * the same basename but different path because they can
+	 * provide different versions of the same modules.
+	 */
+	filename = linker_basename(pathname);
+	if (linker_find_file_by_name(filename))
+		error = EEXIST;
+	else do {
+		error = linker_load_file(pathname, &lfdep);
+		if (error)
+			break;
+		if (modname && verinfo &&
+		    modlist_lookup2(modname, verinfo) == NULL) {
+			linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
+			error = ENOENT;
+			break;
+		}
+		if (parent) {
+			error = linker_file_add_dependency(parent, lfdep);
+			if (error)
+				break;
+		}
+		if (lfpp)
+			*lfpp = lfdep;
+	} while (0);
+	free(pathname, M_LINKER);
+	return (error);
+}
+
+/*
+ * This routine is responsible for finding dependencies of userland initiated
+ * kldload(2)'s of files.
+ */
+int
+linker_load_dependencies(linker_file_t lf)
+{
+	linker_file_t lfdep;
+	struct mod_metadata **start, **stop, **mdp, **nmdp;
+	struct mod_metadata *mp, *nmp;
+	struct mod_depend *verinfo;
+	modlist_t mod;
+	const char *modname, *nmodname;
+	int ver, error = 0, count;
+
+	/*
+	 * All files are dependant on /kernel.
+	 */
+	KLD_LOCK_ASSERT();
+	if (linker_kernel_file) {
+		linker_kernel_file->refs++;
+		error = linker_file_add_dependency(lf, linker_kernel_file);
+		if (error)
+			return (error);
+	}
+	if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
+	    &count) != 0)
+		return (0);
+	for (mdp = start; mdp < stop; mdp++) {
+		mp = *mdp;
+		if (mp->md_type != MDT_VERSION)
+			continue;
+		modname = mp->md_cval;
+		ver = ((struct mod_version *)mp->md_data)->mv_version;
+		mod = modlist_lookup(modname, ver);
+		if (mod != NULL) {
+			printf("interface %s.%d already present in the KLD"
+			    " '%s'!\n", modname, ver,
+			    mod->container->filename);
+			return (EEXIST);
+		}
+	}
+
+	for (mdp = start; mdp < stop; mdp++) {
+		mp = *mdp;
+		if (mp->md_type != MDT_DEPEND)
+			continue;
+		modname = mp->md_cval;
+		verinfo = mp->md_data;
+		nmodname = NULL;
+		for (nmdp = start; nmdp < stop; nmdp++) {
+			nmp = *nmdp;
+			if (nmp->md_type != MDT_VERSION)
+				continue;
+			nmodname = nmp->md_cval;
+			if (strcmp(modname, nmodname) == 0)
+				break;
+		}
+		if (nmdp < stop)/* early exit, it's a self reference */
+			continue;
+		mod = modlist_lookup2(modname, verinfo);
+		if (mod) {	/* woohoo, it's loaded already */
+			lfdep = mod->container;
+			lfdep->refs++;
+			error = linker_file_add_dependency(lf, lfdep);
+			if (error)
+				break;
+			continue;
+		}
+		error = linker_load_module(NULL, modname, lf, verinfo, NULL);
+		if (error) {
+			printf("KLD %s: depends on %s - not available or"
+			    " version mismatch\n", lf->filename, modname);
+			break;
+		}
+	}
+
+	if (error)
+		return (error);
+	linker_addmodules(lf, start, stop, 0);
+	return (error);
+}
+
+static int
+sysctl_kern_function_list_iterate(const char *name, void *opaque)
+{
+	struct sysctl_req *req;
+
+	req = opaque;
+	return (SYSCTL_OUT(req, name, strlen(name) + 1));
+}
+
+/*
+ * Export a nul-separated, double-nul-terminated list of all function names
+ * in the kernel.
+ */
+static int
+sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
+{
+	linker_file_t lf;
+	int error;
+
+#ifdef MAC
+	error = mac_kld_check_stat(req->td->td_ucred);
+	if (error)
+		return (error);
+#endif
+	error = sysctl_wire_old_buffer(req, 0);
+	if (error != 0)
+		return (error);
+	KLD_LOCK();
+	TAILQ_FOREACH(lf, &linker_files, link) {
+		error = LINKER_EACH_FUNCTION_NAME(lf,
+		    sysctl_kern_function_list_iterate, req);
+		if (error) {
+			KLD_UNLOCK();
+			return (error);
+		}
+	}
+	KLD_UNLOCK();
+	return (SYSCTL_OUT(req, "", 1));
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD,
+    NULL, 0, sysctl_kern_function_list, "", "kernel function list");
+#endif /* __rtems__ */
diff --git a/freebsd/local/linker_if.h b/freebsd/local/linker_if.h
new file mode 100644
index 00000000..936ffd88
--- /dev/null
+++ b/freebsd/local/linker_if.h
@@ -0,0 +1 @@
+/* EMPTY */