implement _cu_memcpy in AArch64

arch/AArch64.S

@@ -13,6 +13,8 @@
 .text
 
 hw_bswap16:
+    rev w0, w0
+    mov w0, w0, lsr #16
     ret
 
 hw_bswap32:
@@ -24,6 +26,24 @@ hw_bswap64:
     ret
 
 _cu_memcpy:
+    // x0 - dst, x1 - src, x2 - size
+    mov x3, x2, lsr #3
+    tst x3, x3
+    beq .cpy1_
+.cpy8:
+    ldr x4, [x1], #8
+    str x4, [x0], #8
+    subs x3, x3, #1
+    bne .cpy8
+.cpy1_:
+    and x3, x2, #7
+    beq .cpy0
+.cpy1:
+    ldrb w4, [x1], #1
+    strb w4, [x0], #1
+    subs x3, x3, #1
+    bne .cpy1
+.cpy0:
     ret
 
 _cu_memmove:

test.c

@@ -53,6 +53,7 @@ u8 internal_heap[4096];
 int main()
 {
     cutil_init(internal_heap, 4096);
+
     printf("[list]\n");
     list_t list;
     list_init(&list);