asmlinkage long xtensa_ptrace(long, long, long, long);
asmlinkage long xtensa_sigreturn(struct pt_regs*);
asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
-asmlinkage long xtensa_sigsuspend(struct pt_regs*);
-asmlinkage long xtensa_rt_sigsuspend(struct pt_regs*);
asmlinkage long xtensa_sigaction(int, const struct old_sigaction*,
struct old_sigaction*);
asmlinkage long xtensa_sigaltstack(struct pt_regs *regs);