Fix fstat for MIPS userland emulation, and add support for a cacheflush

[qemu] / linux-user / sparc64 / syscall.h

struct target_pt_regs {
        target_ulong u_regs[16];
        target_ulong tstate;
        target_ulong pc;
        target_ulong npc;
        target_ulong y;
        target_ulong fprs;
};

#define UNAME_MACHINE "sun4u"