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

fusl/arch/powerpc/pthread_arch.h

+static inline struct pthread *__pthread_self()
+{
+#ifdef __clang__
+        char *tp;
+        __asm__ __volatile__ ("mr %0, 2" : "=r"(tp) : : );
+#else
+        register char *tp __asm__("r2");
+        __asm__ __volatile__ ("" : "=r" (tp) );
+#endif
+        return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
+}
+                        
+#define TLS_ABOVE_TP
+#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+
+#define DTP_OFFSET 0x8000
+
+// the kernel calls the ip "nip", it's the first saved value after the 32
+// GPRs.
+#define MC_PC gregs[32]
+
+#define CANARY canary_at_end