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

fusl/arch/sh/bits/user.h

+#undef __WORDSIZE
+#define __WORDSIZE 32
+
+#define REG_REG0         0
+#define REG_REG15       15
+#define REG_PC          16
+#define REG_PR          17
+#define REG_SR          18
+#define REG_GBR         19
+#define REG_MACH        20
+#define REG_MACL        21
+#define REG_SYSCALL     22
+#define REG_FPREG0      23
+#define REG_FPREG15     38
+#define REG_XFREG0      39
+#define REG_XFREG15     54
+#define REG_FPSCR       55
+#define REG_FPUL        56
+
+struct pt_regs {
+        unsigned long regs[16];
+        unsigned long pc;
+        unsigned long pr;
+        unsigned long sr;
+        unsigned long gbr;
+        unsigned long mach;
+        unsigned long macl;
+        long tra;
+};
+
+struct pt_dspregs {
+        unsigned long a1;
+        unsigned long a0g;
+        unsigned long a1g;
+        unsigned long m0;
+        unsigned long m1;
+        unsigned long a0;
+        unsigned long x0;
+        unsigned long x1;
+        unsigned long y0;
+        unsigned long y1;
+        unsigned long dsr;
+        unsigned long rs;
+        unsigned long re;
+        unsigned long mod;
+};
+
+struct user_fpu_struct {
+        unsigned long fp_regs[16];
+        unsigned long xfp_regs[16];
+        unsigned long fpscr;
+        unsigned long fpul;
+};
+
+#define ELF_NGREG 23
+typedef unsigned long elf_greg_t;
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+typedef struct user_fpu_struct elf_fpregset_t;
+
+struct user {
+        struct pt_regs regs;
+        struct user_fpu_struct fpu;
+        int u_fpvalid;
+        unsigned long u_tsize;
+        unsigned long u_dsize;
+        unsigned long u_ssize;
+        unsigned long start_code;
+        unsigned long start_data;
+        unsigned long start_stack;
+        long int signal;
+        unsigned long u_ar0;
+        struct user_fpu_struct *u_fpstate;
+        unsigned long magic;
+        char u_comm[32];
+};