[rtems-libbsd commit] Add missing files
Sebastian Huber
sebh at rtems.org
Thu Apr 19 10:09:05 UTC 2012
Module: rtems-libbsd
Branch: master
Commit: f2eb2bd4c585f5fcc7b0ce71e73c4793cc822e18
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=f2eb2bd4c585f5fcc7b0ce71e73c4793cc822e18
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Thu Apr 19 12:11:24 2012 +0200
Add missing files
---
freebsd/kern/kern_linker.c | 2153 ++++++++++++++++++++++++++++++++++++++++++++
freebsd/local/linker_if.h | 1 +
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 0000000..15141f2
--- /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 0000000..936ffd8
--- /dev/null
+++ b/freebsd/local/linker_if.h
@@ -0,0 +1 @@
+/* EMPTY */
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