This is the kernel linker. To use it, you will first need to apply

the patches in freefall:/home/dfr/ld.diffs to your ld sources and set
BINFORMAT to aoutkld when linking the kernel.

Library changes and userland utilities will appear in a later commit.

1 files changed, 304 insertions, 0 deletions

diff --git a/sys/kern/kern_module.c b/sys/kern/kern_module.c
new file mode 100644
index 0000000..8a4048a
--- /dev/null
+++ b/sys/kern/kern_module.c
@@ -0,0 +1,304 @@
+/*-
+ * Copyright (c) 1997 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.
+ *
+ *	$Id$
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/queue.h>
+#include <sys/libkern.h>
+#include <sys/malloc.h>
+#include <sys/sysproto.h>
+#include <sys/sysent.h>
+#include <sys/module.h>
+#include <sys/linker.h>
+
+#define M_MODULE	M_TEMP		/* XXX */
+
+typedef TAILQ_HEAD(, module) modulelist_t;
+struct module {
+    TAILQ_ENTRY(module)	link;		/* chain together all modules */
+    TAILQ_ENTRY(module)	flink;		/* all modules in a file */
+    struct linker_file*	file;		/* file which contains this module */
+    int			refs;		/* reference count */
+    int			id;		/* unique id number */
+    char		*name;		/* module name */
+    modeventhand_t	handler;	/* event handler */
+    void		*arg;		/* argument for handler */
+};
+
+#define MOD_EVENT(mod, type) (mod)->handler((mod), (type), (mod)->arg)
+
+static modulelist_t modules;
+static int nextid = 1;
+
+static void module_shutdown(int, void*);
+
+static void
+module_init(void* arg)
+{
+    TAILQ_INIT(&modules);
+    at_shutdown(module_shutdown, 0, SHUTDOWN_POST_SYNC);
+}
+
+SYSINIT(module, SI_SUB_KMEM, SI_ORDER_ANY, module_init, 0);
+
+static void
+module_shutdown(int arg1, void* arg2)
+{
+    module_t mod;
+    int error;
+
+    for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link))
+	MOD_EVENT(mod, MOD_SHUTDOWN);
+}
+
+void
+module_register_static(void *arg)
+{
+    moduledata_t* data = (moduledata_t*) arg;
+    int error;
+
+    if (error = module_register(data->name, data->evhand, data->priv))
+	printf("module_register_static: module_register(%s, %x, %x) returned %d",
+	       data->name, data->evhand, data->priv, error);
+}
+
+int
+module_register(const char* name, modeventhand_t handler, void* arg)
+{
+    size_t namelen;
+    module_t newmod;
+    int error;
+
+    namelen = strlen(name) + 1;
+    newmod = (module_t) malloc(sizeof(struct module) + namelen,
+			       M_MODULE, M_WAITOK);
+    if (newmod == 0)
+	return ENOMEM;
+
+    newmod->refs = 1;
+    newmod->id = nextid++;
+    newmod->name = (char *) (newmod + 1);
+    strcpy(newmod->name, name);
+    newmod->handler = handler;
+    newmod->arg = arg;
+    TAILQ_INSERT_TAIL(&modules, newmod, link);
+
+    if (linker_current_file) {
+	TAILQ_INSERT_TAIL(&linker_current_file->modules, newmod, flink);
+	newmod->file = linker_current_file;
+    } else
+	newmod->file = 0;
+
+    if (error = MOD_EVENT(newmod, MOD_LOAD)) {
+	module_release(newmod);
+	return error;
+    }
+
+    return 0;
+}
+
+void
+module_reference(module_t mod)
+{
+    MOD_DPF(REFS, ("module_reference: before, refs=%d\n", mod->refs));
+
+    mod->refs++;
+}
+
+void
+module_release(module_t mod)
+{
+    if (mod->refs <= 0)
+	panic("module_release: bad reference count");
+
+    MOD_DPF(REFS, ("module_release: before, refs=%d\n", mod->refs));
+
+    mod->refs--;
+    if (mod->refs == 0) {
+	TAILQ_REMOVE(&modules, mod, link);
+	if (mod->file) {
+	    TAILQ_REMOVE(&mod->file->modules, mod, flink);
+	}
+	free(mod, M_MODULE);
+    }
+}
+
+module_t
+module_lookupbyname(const char* name)
+{
+    module_t mod;
+
+    for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link)) {
+	if (!strcmp(mod->name, name))
+	    return mod;
+    }
+
+    return 0;
+}
+
+module_t
+module_lookupbyid(int modid)
+{
+    module_t mod;
+
+    for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link)) {
+	if (mod->id == modid)
+	    return mod;
+    }
+
+    return 0;
+}
+
+int
+module_unload(module_t mod)
+{
+    return MOD_EVENT(mod, MOD_UNLOAD);
+}
+
+int
+module_getid(module_t mod)
+{
+    return mod->id;
+}
+
+module_t
+module_getfnext(module_t mod)
+{
+    return TAILQ_NEXT(mod, flink);
+}
+
+/*
+ * Syscalls.
+ */
+int
+modnext(struct proc* p, struct modnext_args* uap, int* retval)
+{
+    module_t mod;
+
+    *retval = -1;
+    if (SCARG(uap, modid) == 0) {
+	mod = TAILQ_FIRST(&modules);
+	if (mod) {
+	    *retval = mod->id;
+	    return 0;
+	} else
+	    return ENOENT;
+    }
+
+    mod = module_lookupbyid(SCARG(uap, modid));
+    if (!mod)
+	return ENOENT;
+
+    if (TAILQ_NEXT(mod, link))
+	*retval = TAILQ_NEXT(mod, link)->id;
+    else
+	*retval = 0;
+    return 0;
+}
+
+int
+modfnext(struct proc* p, struct modfnext_args* uap, int* retval)
+{
+    module_t mod;
+
+    *retval = -1;
+
+    mod = module_lookupbyid(SCARG(uap, modid));
+    if (!mod)
+	return ENOENT;
+
+    if (TAILQ_NEXT(mod, flink))
+	*retval = TAILQ_NEXT(mod, flink)->id;
+    else
+	*retval = 0;
+    return 0;
+}
+
+int
+modstat(struct proc* p, struct modstat_args* uap, int* retval)
+{
+    module_t mod;
+    int error = 0;
+    int namelen;
+    int version;
+    struct module_stat* stat;
+
+    mod = module_lookupbyid(SCARG(uap, modid));
+    if (!mod)
+	return ENOENT;
+
+    stat = SCARG(uap, stat);
+
+    /*
+     * Check the version of the user's structure.
+     */
+    if (error = copyin(&stat->version, &version, sizeof(version)))
+	goto out;
+    if (version != sizeof(struct module_stat)) {
+	error = EINVAL;
+	goto out;
+    }
+
+    namelen = strlen(mod->name) + 1;
+    if (namelen > MAXMODNAME)
+	namelen = MAXMODNAME;
+    if (error = copyout(mod->name, &stat->name[0], namelen))
+	goto out;
+
+    if (error = copyout(&mod->refs, &stat->refs, sizeof(int)))
+	goto out;
+    if (error = copyout(&mod->id, &stat->id, sizeof(int)))
+	goto out;
+
+    *retval = 0;
+
+out:
+    return error;
+}
+
+int
+modfind(struct proc* p, struct modfind_args* uap, int* retval)
+{
+    int error = 0;
+    char name[MAXMODNAME];
+    module_t mod;
+
+    if (error = copyinstr(SCARG(uap, name), name, sizeof name, 0))
+	goto out;
+
+    mod = module_lookupbyname(name);
+    if (!mod)
+	error = ENOENT;
+    else
+	*retval = mod->id;
+
+out:
+    return error;
+}