add arm bindings for res_search

Signed-off-by: grant <[email protected]>

src/net/lookup_darwin_arm.s

@@ -0,0 +1,20 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// System calls and other sys.stuff for ARM64, Darwin
+// System calls are implemented in libSystem, this file contains
+// trampolines that convert from Go to C calling convention.
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+
+TEXT runtime·res_search_trampoline(SB),NOSPLIT,$0
+    MOVW 16(R0). R4 // arg 5 anslen
+    MOVW 12(R0), R3 // arg 4 answer
+    MOVW 4(R0), R1  // arg 2 class
+    MOVW 8(R0), R2  // arg 3 type 
+    MOVW 0(R0), R0  // arg 1 name
+    BL libc_res_search
+    RET 

src/net/lookup_darwin_arm64.s

@@ -0,0 +1,17 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+
+TEXT runtime·res_search_trampoline(SB),NOSPLIT,$0
+    SUB    $16, RSP
+    MOVW   24(R0), R4 // arg 5 anslen
+    MOVD   16(R0), R3 // arg 4 answer
+    MOVW   8(R0), R1  // arg 2 class 
+    MOVD   12(R0), R2 // arg 3 type
+    MOVD   0(R0), R0  // arg 1 name
+    BL     libc_res_search(SB)
+    RET