#define instruction_pointer(regs) ((unsigned long)(regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)
+#define user_stack_pointer(r) ((unsigned long)(r)->regs[0])
extern void do_syscall_trace(struct pt_regs *regs, int entryexit);
extern int read_tsk_long(struct task_struct *, unsigned long, unsigned long *);