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

fusl/arch/mips/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))
+
+__attribute__((visibility("hidden")))
+long (__syscall)(long, ...);
+
+#define SYSCALL_RLIM_INFINITY (-1UL/2)
+
+#if _MIPSEL || __MIPSEL || __MIPSEL__
+#define __stat_fix(st) ((st),(void)0)
+#else
+#include <sys/stat.h>
+static inline void __stat_fix(long p)
+{
+        struct stat *st = (struct stat *)p;
+        st->st_dev >>= 32;
+        st->st_rdev >>= 32;
+}
+#endif
+
+#ifndef __clang__
+
+static inline long __syscall0(long n)
+{
+        register long r7 __asm__("$7");
+        register long r2 __asm__("$2");
+        __asm__ __volatile__ (
+                "addu $2,$0,%2 ; syscall"
+                : "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7)
+                : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+                  "$14", "$15", "$24", "$25", "hi", "lo", "memory");
+        return r7 ? -r2 : r2;
+}
+
+static inline long __syscall1(long n, long a)
+{
+        register long r4 __asm__("$4") = a;
+        register long r7 __asm__("$7");
+        register long r2 __asm__("$2");
+        __asm__ __volatile__ (
+                "addu $2,$0,%2 ; syscall"
+                : "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
+                  "r"(r4)
+                : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+                  "$14", "$15", "$24", "$25", "hi", "lo", "memory");
+        return r7 ? -r2 : r2;
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+        register long r4 __asm__("$4") = a;
+        register long r5 __asm__("$5") = b;
+        register long r7 __asm__("$7");
+        register long r2 __asm__("$2");
+        __asm__ __volatile__ (
+                "addu $2,$0,%2 ; syscall"
+                : "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
+                  "r"(r4), "r"(r5)
+                : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+                  "$14", "$15", "$24", "$25", "hi", "lo", "memory");
+        if (r7) return -r2;
+        long ret = r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        return ret;
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+        register long r4 __asm__("$4") = a;
+        register long r5 __asm__("$5") = b;
+        register long r6 __asm__("$6") = c;
+        register long r7 __asm__("$7");
+        register long r2 __asm__("$2");
+        __asm__ __volatile__ (
+                "addu $2,$0,%2 ; syscall"
+                : "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
+                  "r"(r4), "r"(r5), "r"(r6)
+                : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+                  "$14", "$15", "$24", "$25", "hi", "lo", "memory");
+        if (r7) return -r2;
+        long ret = r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        return ret;
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+        register long r4 __asm__("$4") = a;
+        register long r5 __asm__("$5") = b;
+        register long r6 __asm__("$6") = c;
+        register long r7 __asm__("$7") = d;
+        register long r2 __asm__("$2");
+        __asm__ __volatile__ (
+                "addu $2,$0,%2 ; syscall"
+                : "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
+                  "r"(r4), "r"(r5), "r"(r6)
+                : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+                  "$14", "$15", "$24", "$25", "hi", "lo", "memory");
+        if (r7) return -r2;
+        long ret = r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        if (n == SYS_fstatat) __stat_fix(c);
+        return ret;
+}
+
+#else
+
+static inline long __syscall0(long n)
+{
+        return (__syscall)(n);
+}
+
+static inline long __syscall1(long n, long a)
+{
+        return (__syscall)(n, a);
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+        long r2 = (__syscall)(n, a, b);
+        if (r2 > -4096UL) return r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        return r2;
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+        long r2 = (__syscall)(n, a, b, c);
+        if (r2 > -4096UL) return r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        return r2;
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+        long r2 = (__syscall)(n, a, b, c, d);
+        if (r2 > -4096UL) return r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        if (n == SYS_fstatat) __stat_fix(c);
+        return r2;
+}
+
+#endif
+
+static inline long __syscall5(long n, long a, long b, long c, long d, long e)
+{
+        long r2 = (__syscall)(n, a, b, c, d, e);
+        if (r2 > -4096UL) return r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        if (n == SYS_fstatat) __stat_fix(c);
+        return r2;
+}
+
+static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
+{
+        long r2 = (__syscall)(n, a, b, c, d, e, f);
+        if (r2 > -4096UL) return r2;
+        if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
+        if (n == SYS_fstatat) __stat_fix(c);
+        return r2;
+}