LOCAL_ARCH=$(uname -m)
if [ "${TARGET_ARCH}" ]; then
    LOCAL_ARCH=${TARGET_ARCH}
fi

case "${LOCAL_ARCH}" in
  x86_64|amd64)
    ISTIO_ARCH=amd64
    ;;
  armv8*|aarch64*|arm64)
    ISTIO_ARCH=arm64
    ;;
  armv*)
    ISTIO_ARCH=armv7
    ;;
  *)
    echo "This system's architecture, ${LOCAL_ARCH}, isn't supported"
    exit 1
    ;;
esac

download_failed () {

LOCAL_ARCH=$(uname -m)
if [ "${TARGET_ARCH}" ]; then
    LOCAL_ARCH=${TARGET_ARCH}
fi

case "${LOCAL_ARCH}" in
  x86_64|amd64)
    ISTIO_ARCH=amd64
    ;;
  armv8*|aarch64*|arm64)
    ISTIO_ARCH=arm64
    ;;
  armv*)
    ISTIO_ARCH=armv7
    ;;
  *)
    echo "This system's architecture, ${LOCAL_ARCH}, isn't supported"
    exit 1
    ;;
esac

if [ "${ISTIO_VERSION}" = "" ] ; then

	// a cross-compiling toolchain, try to exec ourselves
	// to detect whether VFP is supported and set the default GOARM.
	// Windows requires ARMv7, so we can skip the check.
	// We've always assumed Android is ARMv7 too.
	if gohostarch == "arm" && goarch == "arm" && goos == gohostos && goos != "windows" && goos != "android" {
		// Try to exec ourselves in a mode to detect VFP support.

	B	·Xchg(SB)

TEXT ·Xchgint64(SB),NOSPLIT,$-4-20
	B	·Xchg64(SB)

// 64-bit atomics
// The native ARM implementations use LDREXD/STREXD, which are
// available on ARMv6k or later. We use them only on ARMv7.
// On older ARM, we use Go implementations which simulate 64-bit
// atomics with locks.
TEXT armCas64<>(SB),NOSPLIT,$0-21
	// addr is already in R1
	MOVW	old_lo+4(FP), R2
	MOVW	old_hi+8(FP), R3

${TARGET_OUT}/release/istioctl-linux-amd64:
	GOOS=linux GOARCH=amd64 LDFLAGS=$(RELEASE_LDFLAGS) common/scripts/gobuild.sh $@ ./istioctl/cmd/istioctl
${TARGET_OUT}/release/istioctl-linux-armv7:
	GOOS=linux GOARCH=arm GOARM=7 LDFLAGS=$(RELEASE_LDFLAGS) common/scripts/gobuild.sh $@ ./istioctl/cmd/istioctl
${TARGET_OUT}/release/istioctl-linux-arm64:

	MOVW arg+8(FP), R2	// arg
	MOVW $SYS_fcntl, R7
	SWI $0
	MOVW $0, R1
	MOVW.CS R0, R1
	MOVW.CS $-1, R0
	MOVW R0, ret+12(FP)
	MOVW R1, errno+16(FP)
	RET

// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
	B	runtime·armPublicationBarrier(SB)

// TODO(minux): this only supports ARMv6K+.
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0

    # TODO(toddw): Add target_triple for other targets.  For details see:
    # http://llvm.org/docs/doxygen/html/Triple_8h_source.html
    return select({
        "//tensorflow:android_armeabi": "armv5-none-android",
        "//tensorflow:android_arm": "armv7-none-android",
        "//tensorflow:android_arm64": "aarch64-none-android",
        "//tensorflow:android_x86": "i686-none-android",
        "//tensorflow:ios": "arm64-none-ios",

	MOVW cmd+4(FP), R1
	MOVW arg+8(FP), R2
	SWI $SYS_fcntl
	MOVW $0, R1
	MOVW.CS R0, R1
	MOVW.CS $-1, R0
	MOVW R0, ret+12(FP)
	MOVW R1, errno+16(FP)
	RET

// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
	B	runtime·armPublicationBarrier(SB)

TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
	MOVM.WP [R1, R2, R3, R12], (R13)
	SWI $SYS__lwp_getprivate

	SWI	$0
	RET

// As for cas, memory barriers are complicated on ARM, but the kernel
// provides a user helper. ARMv5 does not support SMP and has no
// memory barrier instruction at all. ARMv6 added SMP support and has
// a memory barrier, but it requires writing to a coprocessor
// register. ARMv7 introduced the DMB instruction, but it's expensive
// even on single-core devices. The kernel helper takes care of all of
// this for us.

#     elinux:          General Embedded Linux options shared by all flavors.
#     elinux_aarch64:  Embedded Linux options for aarch64 (ARM64) CPU support.
#     elinux_armhf:    Embedded Linux options for armhf (ARMv7) CPU support.
#
# Release build options (for all operating systems)
#     release_base:                    Common options for all builds on all operating systems.