Start to import support for the AArch64 architecture from ARM. This change

only adds support for kernel-toolchain, however it is expected further
changes to add kernel and userland support will be committed as they are
reviewed.

As our copy of binutils is too old the devel/aarch64-binutils port needs
to be installed to pull in a linker.

To build either TARGET needs to be set to arm64, or TARGET_ARCH set to
aarch64. The latter is set so uname -p will return aarch64 as existing
third party software expects this.

Differential Revision:	https://reviews.freebsd.org/D2005
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/csu/aarch64/Makefile b/lib/csu/aarch64/Makefile
new file mode 100644
index 0000000..bf4c7b1
--- /dev/null
+++ b/lib/csu/aarch64/Makefile
@@ -0,0 +1,44 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../common
+
+SRCS=		crt1.c crti.S crtn.S
+OBJS=		${SRCS:N*.h:R:S/$/.o/g}
+OBJS+=		Scrt1.o gcrt1.o
+CFLAGS+=	-I${.CURDIR}/../common \
+		-I${.CURDIR}/../../libc/include
+
+all: ${OBJS}
+
+CLEANFILES=	${OBJS}
+CLEANFILES+=	crt1.s gcrt1.s Scrt1.s
+
+# See the comment in lib/csu/common/crtbrand.c for the reason crt1.c is not
+# directly compiled to .o files.
+
+crt1.s: crt1.c
+	${CC} ${CFLAGS} -S -o ${.TARGET} ${.CURDIR}/crt1.c
+	sed ${SED_FIX_NOTE} ${.TARGET}
+
+crt1.o: crt1.s
+	${CC} ${ACFLAGS} -c -o ${.TARGET} crt1.s
+
+gcrt1.s: crt1.c
+	${CC} ${CFLAGS} -DGCRT -S -o ${.TARGET} ${.CURDIR}/crt1.c
+	sed ${SED_FIX_NOTE} ${.TARGET}
+
+gcrt1.o: gcrt1.s
+	${CC} ${ACFLAGS} -c -o ${.TARGET} gcrt1.s
+
+Scrt1.s: crt1.c
+	${CC} ${CFLAGS} -fPIC -DPIC -S -o ${.TARGET} ${.CURDIR}/crt1.c
+	sed ${SED_FIX_NOTE} ${.TARGET}
+
+Scrt1.o: Scrt1.s
+	${CC} ${ACFLAGS} -c -o ${.TARGET} Scrt1.s
+
+realinstall:
+	${INSTALL} -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
+	    ${OBJS} ${DESTDIR}${LIBDIR}
+
+.include <bsd.lib.mk>