Add a "fork" of musl as //fusl.

fusl/arch/aarch64/syscall_arch.h

+#define __SYSCALL_LL_E(x) (x)
+#define __SYSCALL_LL_O(x) (x)
+
+#define __asm_syscall(...) do { \
+        __asm__ __volatile__ ( "svc 0" \
+        : "=r"(x0) : __VA_ARGS__ : "memory", "cc"); \
+        return x0; \
+        } while (0)
+
+static inline long __syscall0(long n)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0");
+        __asm_syscall("r"(x8));
+}
+
+static inline long __syscall1(long n, long a)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        __asm_syscall("r"(x8), "0"(x0));
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        register long x1 __asm__("x1") = b;
+        __asm_syscall("r"(x8), "0"(x0), "r"(x1));
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        register long x1 __asm__("x1") = b;
+        register long x2 __asm__("x2") = c;
+        __asm_syscall("r"(x8), "0"(x0), "r"(x1), "r"(x2));
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        register long x1 __asm__("x1") = b;
+        register long x2 __asm__("x2") = c;
+        register long x3 __asm__("x3") = d;
+        __asm_syscall("r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3));
+}
+
+static inline long __syscall5(long n, long a, long b, long c, long d, long e)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        register long x1 __asm__("x1") = b;
+        register long x2 __asm__("x2") = c;
+        register long x3 __asm__("x3") = d;
+        register long x4 __asm__("x4") = e;
+        __asm_syscall("r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x4));
+}
+
+static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
+{
+        register long x8 __asm__("x8") = n;
+        register long x0 __asm__("x0") = a;
+        register long x1 __asm__("x1") = b;
+        register long x2 __asm__("x2") = c;
+        register long x3 __asm__("x3") = d;
+        register long x4 __asm__("x4") = e;
+        register long x5 __asm__("x5") = f;
+        __asm_syscall("r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x4), "r"(x5));
+}
+
+#define VDSO_USEFUL
+#define VDSO_CGT_SYM "__kernel_clock_gettime"
+#define VDSO_CGT_VER "LINUX_2.6.39"