Add ARM support. (#85)

internal/buffer/out_message.go

@@ -55,22 +55,8 @@ func init() {
 // Reset resets m so that it's ready to be used again. Afterward, the contents
 // are solely a zeroed fusekernel.OutHeader struct.
 func (m *OutMessage) Reset() {
-	// Ideally we'd like to write:
-	//
-	//     m.payloadOffset = 0
-	//     m.header = fusekernel.OutHeader{}
-	//
-	// But Go 1.8 beta 2 generates bad code for this
-	// (https://golang.org/issue/18370). Encourage it to generate the same code
-	// as Go 1.7.4 did.
-	if unsafe.Offsetof(m.payload) != 24 {
-		panic("unexpected OutMessage layout")
-	}
-
-	a := (*[3]uint64)(unsafe.Pointer(m))
-	a[0] = 0
-	a[1] = 0
-	a[2] = 0
+	m.payloadOffset = 0
+	m.header = fusekernel.OutHeader{}
 }
 
 // OutHeader returns a pointer to the header at the start of the message.

internal/buffer/runtime_go1.8.s

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build amd64 arm64 ppc64 ppc64le
+// +build amd64 arm64 ppc64 ppc64le arm
 // +build go1.8
 
 // Assembly code isn't subject to visibility restrictions, so we can jump
@@ -23,6 +23,9 @@
 
 #include "textflag.h"
 
+#ifdef GOARCH_arm
+#define JMP B
+#endif
 #ifdef GOARCH_ppc64
 #define JMP BR
 #endif

internal/buffer/runtime_other.s

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build amd64 arm64 ppc64 ppc64le
+// +build amd64 arm64 ppc64 ppc64le arm
 // +build !go1.8
 
 // Assembly code isn't subject to visibility restrictions, so we can jump
@@ -23,6 +23,9 @@
 
 #include "textflag.h"
 
+#ifdef GOARCH_arm
+#define JMP B
+#endif
 #ifdef GOARCH_ppc64
 #define JMP BR
 #endif