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

fusl/arch/arm/syscall_arch.h

+#define __SYSCALL_LL_E(x) \
+((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
+((union { long long ll; long l[2]; }){ .ll = x }).l[1]
+#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
+
+#define __asm_syscall(...) do { \
+        __asm__ __volatile__ ( "svc 0" \
+        : "=r"(r0) : __VA_ARGS__ : "memory"); \
+        return r0; \
+        } while (0)
+
+static inline long __syscall0(long n)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0");
+        __asm_syscall("r"(r7));
+}
+
+static inline long __syscall1(long n, long a)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        __asm_syscall("r"(r7), "0"(r0));
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        register long r1 __asm__("r1") = b;
+        __asm_syscall("r"(r7), "0"(r0), "r"(r1));
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        register long r1 __asm__("r1") = b;
+        register long r2 __asm__("r2") = c;
+        __asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2));
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        register long r1 __asm__("r1") = b;
+        register long r2 __asm__("r2") = c;
+        register long r3 __asm__("r3") = d;
+        __asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2), "r"(r3));
+}
+
+static inline long __syscall5(long n, long a, long b, long c, long d, long e)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        register long r1 __asm__("r1") = b;
+        register long r2 __asm__("r2") = c;
+        register long r3 __asm__("r3") = d;
+        register long r4 __asm__("r4") = e;
+        __asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4));
+}
+
+static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
+{
+        register long r7 __asm__("r7") = n;
+        register long r0 __asm__("r0") = a;
+        register long r1 __asm__("r1") = b;
+        register long r2 __asm__("r2") = c;
+        register long r3 __asm__("r3") = d;
+        register long r4 __asm__("r4") = e;
+        register long r5 __asm__("r5") = f;
+        __asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
+}
+
+#define VDSO_USEFUL
+#define VDSO_CGT_SYM "__vdso_clock_gettime"
+#define VDSO_CGT_VER "LINUX_2.6"