Formalize the use of linker scripts for kernel modules.

Automatically apply ldscript.kmod.${MACHINE_ARCH} if it exists.
We already have an i386-specific linker script; rename it accordingly.

Note that the linker script is applied when the object files are
partially linked.  (For amd64 this is also the final link.)

Reviewed by:	imp, kib
Discussed with:	jhb
MFC after:	1 week
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D21887

1 files changed, 46 insertions, 0 deletions

diff --git a/sys/conf/ldscript.kmod.i386 b/sys/conf/ldscript.kmod.i386
new file mode 100644
index 000000000000..083f216c8752
--- /dev/null
+++ b/sys/conf/ldscript.kmod.i386
@@ -0,0 +1,46 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2018 Bjoern A. Zeeb
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+SECTIONS
+{
+	set_pcpu	:
+	{
+		*(set_pcpu)
+		LONG(0x90909090) ;
+	}
+}
+
+SECTIONS
+{
+	set_vnet	:
+	{
+		*(set_vnet)
+		LONG(0x90909090) ;
+	}
+}
+/* end */