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

fusl/arch/microblaze/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))
+
+#ifndef __clang__
+
+static __inline long __syscall0(long n)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall1(long n, long a)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        register unsigned long r6 __asm__("r6") = b;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5), "r"(r6)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        register unsigned long r6 __asm__("r6") = b;
+        register unsigned long r7 __asm__("r7") = c;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5), "r"(r6), "r"(r7)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        register unsigned long r6 __asm__("r6") = b;
+        register unsigned long r7 __asm__("r7") = c;
+        register unsigned long r8 __asm__("r8") = d;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5), "r"(r6), "r"(r7), "r"(r8)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall5(long n, long a, long b, long c, long d, long e)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        register unsigned long r6 __asm__("r6") = b;
+        register unsigned long r7 __asm__("r7") = c;
+        register unsigned long r8 __asm__("r8") = d;
+        register unsigned long r9 __asm__("r9") = e;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5), "r"(r6), "r"(r7), "r"(r8), "r"(r9)
+                : "memory", "r4");
+        return r3;
+}
+
+static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
+{
+        register unsigned long r12 __asm__("r12") = n;
+        register unsigned long r3 __asm__("r3");
+        register unsigned long r5 __asm__("r5") = a;
+        register unsigned long r6 __asm__("r6") = b;
+        register unsigned long r7 __asm__("r7") = c;
+        register unsigned long r8 __asm__("r8") = d;
+        register unsigned long r9 __asm__("r9") = e;
+        register unsigned long r10 __asm__("r10") = f;
+        __asm__ __volatile__ ("brki r14, 0x8" : "=r"(r3)
+                : "r"(r12), "r"(r5), "r"(r6), "r"(r7), "r"(r8), "r"(r9), "r"(r10)
+                : "memory", "r4");
+        return r3;
+}
+
+#else
+
+#undef SYSCALL_NO_INLINE
+#define SYSCALL_NO_INLINE
+
+#endif