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

13 files changed, 540 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index e89a5b1..ee0772d 100644
--- a/Makefile
+++ b/Makefile
@@ -165,10 +165,10 @@ _MAKE=	PATH=${PATH} ${SUB_MAKE} -f Makefile.inc1 TARGET=${_TARGET} TARGET_ARCH=$
 
 # Guess machine architecture from machine type, and vice versa.
 .if !defined(TARGET_ARCH) && defined(TARGET)
-_TARGET_ARCH=	${TARGET:S/pc98/i386/}
+_TARGET_ARCH=	${TARGET:S/pc98/i386/:S/arm64/aarch64/}
 .elif !defined(TARGET) && defined(TARGET_ARCH) && \
     ${TARGET_ARCH} != ${MACHINE_ARCH}
-_TARGET=		${TARGET_ARCH:C/mips(n32|64)?(el)?/mips/:C/arm(v6)?(eb|hf)?/arm/}
+_TARGET=		${TARGET_ARCH:C/mips(n32|64)?(el)?/mips/:C/arm(v6)?(eb|hf)?/arm/:C/aarch64/arm64/}
 .endif
 .if defined(TARGET) && !defined(_TARGET)
 _TARGET=${TARGET}
diff --git a/Makefile.inc1 b/Makefile.inc1
index 1be3920..22d9a01 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -149,7 +149,7 @@ SRCRELDATE!=	awk '/^\#define[[:space:]]*__FreeBSD_version/ { print $$3 }' \
 VERSION=	FreeBSD ${REVISION}-${BRANCH:C/-p[0-9]+$//} ${TARGET_ARCH} ${SRCRELDATE}
 .endif
 
-KNOWN_ARCHES?=	amd64 arm armeb/arm armv6/arm armv6hf/arm i386 i386/pc98 mips mipsel/mips mips64el/mips mips64/mips mipsn32el/mips mipsn32/mips powerpc powerpc64/powerpc sparc64
+KNOWN_ARCHES?=	aarch64/arm64 amd64 arm armeb/arm armv6/arm armv6hf/arm i386 i386/pc98 mips mipsel/mips mips64el/mips mips64/mips mipsn32el/mips mipsn32/mips powerpc powerpc64/powerpc sparc64
 .if ${TARGET} == ${TARGET_ARCH}
 _t=		${TARGET}
 .else
diff --git a/etc/etc.aarch64/ttys b/etc/etc.aarch64/ttys
new file mode 100644
index 0000000..b6fd9ed
--- /dev/null
+++ b/etc/etc.aarch64/ttys
@@ -0,0 +1,49 @@
+#
+# $FreeBSD$
+#	@(#)ttys	5.1 (Berkeley) 4/17/89
+#
+# This file specifies various information about terminals on the system.
+# It is used by several different programs.  Common entries for the
+# various columns include:
+#
+# name  The name of the terminal device.
+#
+# getty The program to start running on the terminal.  Typically a
+#       getty program, as the name implies.  Other common entries
+#       include none, when no getty is needed, and xdm, to start the
+#       X Window System.
+#
+# type The initial terminal type for this port.  For hardwired
+#      terminal lines, this will contain the type of terminal used.
+#      For virtual consoles, the correct type is typically xterm.
+#      Other common values include dialup for incoming modem ports, and
+#      unknown when the terminal type cannot be predetermined.
+#
+# status Must be on or off.  If on, init will run the getty program on
+#        the specified port.  If the word "secure" appears, this tty
+#        allows root login.
+#
+# name	getty				type	status		comments
+#
+# If console is marked "insecure", then init will ask for the root password
+# when going to single-user mode.
+console	none				unknown	off secure
+#
+ttyv0	"/usr/libexec/getty Pc"		xterm	off  secure
+# Virtual terminals
+ttyv1	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv2	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv3	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv4	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv5	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv6	"/usr/libexec/getty Pc"		xterm	off  secure
+ttyv7	"/usr/libexec/getty Pc"		xterm	off  secure
+#ttyv8	"/usr/local/bin/xdm -nodaemon"	xterm	off secure
+# Serial terminals
+# The 'dialup' keyword identifies dialin lines to login, fingerd etc.
+ttyu0	"/usr/libexec/getty std.9600"	vt100	on  secure
+ttyu1	"/usr/libexec/getty std.9600"	dialup	off secure
+ttyu2	"/usr/libexec/getty std.9600"	dialup	off secure
+ttyu3	"/usr/libexec/getty std.9600"	dialup	off secure
+# Dumb console
+dcons	"/usr/libexec/getty std.9600"	vt100	off secure
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>
diff --git a/lib/csu/aarch64/crt1.c b/lib/csu/aarch64/crt1.c
new file mode 100644
index 0000000..6518e8d
--- /dev/null
+++ b/lib/csu/aarch64/crt1.c
@@ -0,0 +1,89 @@
+/* LINTLIBRARY */
+/*-
+ * Copyright 1996-1998 John D. Polstra.
+ * Copyright 2014 Andrew Turner.
+ * Copyright 2014-2015 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 ``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 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifndef lint
+#ifndef __GNUC__
+#error "GCC is needed to compile this file"
+#endif
+#endif /* lint */
+
+#include <stdlib.h>
+
+#include "libc_private.h"
+#include "crtbrand.c"
+#include "ignore_init.c"
+
+#ifdef GCRT
+extern void _mcleanup(void);
+extern void monstartup(void *, void *);
+extern int eprol;
+extern int etext;
+#endif
+
+void __start(int, char **, char **, void (*)(void));
+
+/* The entry function. */
+__asm("	.text			\n"
+"	.align	0		\n"
+"	.globl	_start		\n"
+"	_start:			\n"
+"	mov	x3, x2		\n" /* cleanup */
+"	ldr	x0, [sp]	\n" /* Load argc */
+"	add	x1, sp, #8	\n" /* load argv */
+"	add	x2, x1, x0, lsl #3 \n" /* env is after argv */
+"	add	x2, x2, #8	\n" /* argv is null terminated */
+"	b	 __start  ");
+
+
+/* The entry function. */
+void
+__start(int argc, char *argv[], char *env[], void (*cleanup)(void))
+{
+
+	handle_argv(argc, argv, env);
+
+	if (&_DYNAMIC != NULL)
+		atexit(cleanup);
+	else
+		_init_tls();
+
+#ifdef GCRT
+	atexit(_mcleanup);
+	monstartup(&eprol, &etext);
+__asm__("eprol:");
+#endif
+
+	handle_static_init(argc, argv, env);
+	exit(main(argc, argv, env));
+}
diff --git a/lib/csu/aarch64/crti.S b/lib/csu/aarch64/crti.S
new file mode 100644
index 0000000..13e3b74
--- /dev/null
+++ b/lib/csu/aarch64/crti.S
@@ -0,0 +1,48 @@
+/*-
+ * Copyright 2001 David E. O'Brien
+ * Copyright 2014 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 ``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 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 <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+	.section .init,"ax",@progbits
+	.align 4
+	.globl	_init
+	.type	_init,@function
+_init:
+	sub	sp, sp, #16
+	str	lr, [sp]
+
+	.section .fini,"ax",@progbits
+	.align 4
+	.globl	_fini
+	.type	_fini,@function
+_fini:
+	sub	sp, sp, #16
+	str	lr, [sp]
+
diff --git a/lib/csu/aarch64/crtn.S b/lib/csu/aarch64/crtn.S
new file mode 100644
index 0000000..ebb59b7
--- /dev/null
+++ b/lib/csu/aarch64/crtn.S
@@ -0,0 +1,44 @@
+/*-
+ * Copyright 2001 David E. O'Brien
+ * Copyright 2014 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 ``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 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 <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+	.section .init,"ax",@progbits
+	ldr	lr, [sp]
+	add	sp, sp, #16
+	ret
+
+
+	.section .fini,"ax",@progbits
+	ldr	lr, [sp]
+	add	sp, sp, #16
+	ret
+
+	.section .note.GNU-stack,"",%progbits
diff --git a/lib/libc/aarch64/Makefile.inc b/lib/libc/aarch64/Makefile.inc
new file mode 100644
index 0000000..8cbf181
--- /dev/null
+++ b/lib/libc/aarch64/Makefile.inc
@@ -0,0 +1,5 @@
+# $FreeBSD$
+#
+# Machine dependent definitions for the arm 64-bit architecture.
+#
+
diff --git a/lib/libthr/arch/aarch64/Makefile.inc b/lib/libthr/arch/aarch64/Makefile.inc
new file mode 100644
index 0000000..b720e3d
--- /dev/null
+++ b/lib/libthr/arch/aarch64/Makefile.inc
@@ -0,0 +1,2 @@
+# $FreeBSD$
+
diff --git a/lib/msun/aarch64/Makefile.inc b/lib/msun/aarch64/Makefile.inc
new file mode 100644
index 0000000..286a608
--- /dev/null
+++ b/lib/msun/aarch64/Makefile.inc
@@ -0,0 +1,4 @@
+# $FreeBSD$
+
+LDBL_PREC = 113
+
diff --git a/lib/msun/aarch64/fenv.h b/lib/msun/aarch64/fenv.h
new file mode 100644
index 0000000..077e525
--- /dev/null
+++ b/lib/msun/aarch64/fenv.h
@@ -0,0 +1,245 @@
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_FENV_H_
+#define	_FENV_H_
+
+#include <sys/_types.h>
+
+#ifndef	__fenv_static
+#define	__fenv_static	static
+#endif
+
+typedef	__uint64_t	fenv_t;
+typedef	__uint64_t	fexcept_t;
+
+/* Exception flags */
+#define	FE_INVALID	0x00000001
+#define	FE_DIVBYZERO	0x00000002
+#define	FE_OVERFLOW	0x00000004
+#define	FE_UNDERFLOW	0x00000008
+#define	FE_INEXACT	0x00000010
+#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | \
+			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/*
+ * Rounding modes
+ *
+ * We can't just use the hardware bit values here, because that would
+ * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
+ */
+#define	FE_TONEAREST	0x0
+#define	FE_UPWARD	0x1
+#define	FE_DOWNWARD	0x2
+#define	FE_TOWARDZERO	0x3
+#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
+			 FE_UPWARD | FE_TOWARDZERO)
+#define	_ROUND_SHIFT	22
+
+__BEGIN_DECLS
+
+/* Default floating-point environment */
+extern const fenv_t	__fe_dfl_env;
+#define	FE_DFL_ENV	(&__fe_dfl_env)
+
+/* We need to be able to map status flag positions to mask flag positions */
+#define _FPUSW_SHIFT	8
+#define	_ENABLE_MASK	(FE_ALL_EXCEPT << _FPUSW_SHIFT)
+
+#define	__mrs_fpcr(__r)	__asm __volatile("mrs %0, fpcr" : : "r" (__r))
+#define	__msr_fpcr(__r)	__asm __volatile("msr fpcr, %0" : "=r" (*(__r)))
+
+#define	__mrs_fpsr(__r)	__asm __volatile("mrs %0, fpsr" : : "r" (__r))
+#define	__msr_fpsr(__r)	__asm __volatile("msr fpsr, %0" : "=r" (*(__r)))
+
+__fenv_static __inline int
+feclearexcept(int __excepts)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	__r &= ~__excepts;
+	__msr_fpsr(__r);
+	return (0);
+}
+
+__fenv_static inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	*__flagp = __r & __excepts;
+	return (0);
+}
+
+__fenv_static inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	__r &= ~__excepts;
+	__r |= *__flagp & __excepts;
+	__msr_fpsr(__r);
+	return (0);
+}
+
+__fenv_static inline int
+feraiseexcept(int __excepts)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	__r |= __excepts;
+	__msr_fpsr(__r);
+	return (0);
+}
+
+__fenv_static inline int
+fetestexcept(int __excepts)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	return (__r & __excepts);
+}
+
+__fenv_static inline int
+fegetround(void)
+{
+	fenv_t __r;
+
+	__mrs_fpcr(&__r);
+	return ((__r >> _ROUND_SHIFT) & _ROUND_MASK);
+}
+
+__fenv_static inline int
+fesetround(int __round)
+{
+	fenv_t __r;
+
+	if (__round & ~_ROUND_MASK)
+		return (-1);
+	__mrs_fpcr(&__r);
+	__r &= ~(_ROUND_MASK << _ROUND_SHIFT);
+	__r |= __round << _ROUND_SHIFT;
+	__msr_fpcr(__r);
+	return (0);
+}
+
+__fenv_static inline int
+fegetenv(fenv_t *__envp)
+{
+
+	__mrs_fpcr(&__r);
+	*__envp = __r & _ENABLE_MASK;
+
+	__mrs_fpsr(&__r);
+	*__envp |= __r & (FE_ALL_EXCEPT | (_ROUND_MASK << _ROUND_SHIFT));
+
+	return (0);
+}
+
+__fenv_static inline int
+feholdexcept(fenv_t *__envp)
+{
+	fenv_t __r;
+
+	__mrs_fpcr(&__r);
+	*__envp = __r & _ENABLE_MASK;
+	__r &= ~(_ENABLE_MASK);
+	__msr_fpcr(__r);
+
+	__mrs_fpsr(&__r);
+	*__envp |= __r & (FE_ALL_EXCEPT | (_ROUND_MASK << _ROUND_SHIFT));
+	r &= ~(_ENABLE_MASK);
+	__msr_fpsr(__r);
+	return (0);
+}
+
+__fenv_static inline int
+fesetenv(const fenv_t *__envp)
+{
+
+	__msr_fpcr((*__envp) & _ENABLE_MASK);
+	__msr_fpsr((*__envp) & (FE_ALL_EXCEPT | (_ROUND_MASK << _ROUND_SHIFT));
+	return (0);
+}
+
+__fenv_static inline int
+feupdateenv(const fenv_t *__envp)
+{
+	fexcept_t __r;
+
+	__mrs_fpsr(&__r);
+	fesetenv(__envp);
+	feraiseexcept(__r & FE_ALL_EXCEPT);
+	return (0);
+}
+
+#if __BSD_VISIBLE
+
+/* We currently provide no external definitions of the functions below. */
+
+static inline int
+feenableexcept(int __mask)
+{
+	fenv_t __old_r, __new_r;
+
+	__mrs_fpcr(&__old_r);
+	__new_r = __old_r | ((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__msr_fpcr(__new_r);
+	return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
+}
+
+static inline int
+fedisableexcept(int __mask)
+{
+	fenv_t __old_r, __new_r;
+
+	__mrs_fpcr(&__old_r);
+	__new_r = __old_r & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__msr_fpcr(__new_r);
+	return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
+}
+
+static inline int
+fegetexcept(void)
+{
+	fenv_t __r;
+
+	__mrs_fpcr(&__r);
+	return ((__r & _ENABLE_MASK) >> _FPUSW_SHIFT);
+}
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif	/* !_FENV_H_ */
diff --git a/share/mk/bsd.endian.mk b/share/mk/bsd.endian.mk
index c82c37f..2d1a53e 100644
--- a/share/mk/bsd.endian.mk
+++ b/share/mk/bsd.endian.mk
@@ -1,6 +1,7 @@
 # $FreeBSD$
 
-.if ${MACHINE_ARCH} == "amd64" || \
+.if ${MACHINE_ARCH} == "aarch64" || \
+    ${MACHINE_ARCH} == "amd64" || \
     ${MACHINE_ARCH} == "i386" || \
     (${MACHINE} == "arm" && ${MACHINE_ARCH:Marm*eb*} == "") || \
     ${MACHINE_ARCH:Mmips*el} != ""
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
index fca992b..b6ea715 100644
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -215,8 +215,8 @@ __TT=${MACHINE}
 # If the compiler is not C++11 capable, disable clang and use gcc instead.
 __DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
 __DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
-.elif ${__T} == "amd64" || ${__T} == "i386"
-# On x86, clang is enabled, and will be installed as the default cc.
+.elif ${__T} == "aarch64" || ${__T} == "amd64" || ${__T} == "i386"
+# On x86 and arm64, clang is enabled, and will be installed as the default cc.
 __DEFAULT_YES_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
 __DEFAULT_NO_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
 .elif ${__TT} == "arm" && ${__T:Marm*eb*} == ""
@@ -233,6 +233,9 @@ __DEFAULT_NO_OPTIONS+=CLANG_BOOTSTRAP CLANG_IS_CC
 __DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
 __DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
 .endif
+.if ${__T} == "aarch64"
+BROKEN_OPTIONS+=BINUTILS BINUTILS_BOOTSTRAP GDB
+.endif
 
 .include <bsd.mkopt.mk>