add powerpc64 port

arch/powerpc64/bits/user.h

@@ -0,0 +1,25 @@
+struct pt_regs {
+	unsigned long gpr[32], nip, msr, orig_gpr3, ctr, link, xer, ccr, softe;
+	unsigned long trap, dar, dsisr, result;
+};
+
+struct user {
+	struct pt_regs regs;
+	unsigned long u_tsize, u_dsize, u_ssize;
+	unsigned long start_code, start_data, start_stack;
+	long signal;
+	void *u_ar0;
+	unsigned long magic;
+	char u_comm[32];
+};
+
+#define ELF_NGREG 48
+#define ELF_NFPREG 33
+#define ELF_NVRREG 34
+typedef unsigned long elf_greg_t, elf_gregset_t[ELF_NGREG];
+typedef double elf_fpreg_t, elf_fpregset_t[ELF_NFPREG];
+typedef struct { unsigned u[4]; }
+#ifdef __GNUC__
+__attribute__((__aligned__(16)))
+#endif
+	elf_vrreg_t, elf_vrregset_t[ELF_NVRREG];