#include <linux/sched.h>#include <linux/stacktrace.h>#include <linux/thread_info.h>#include <asm/ptrace.h> void save_stack_trace(struct stack_trace *trace, struct task_struct *task){	unsigned long ksp, fp, thread_base;	struct thread_info *tp; 	if (!task)		task = current;	tp = task_thread_info(task);	if (task == current) {		flushw_all();		__asm__ __volatile__(			"mov	%%fp, %0"			: "=r" (ksp)		);	} else		ksp = tp->ksp; 	fp = ksp + STACK_BIAS;	thread_base = (unsigned long) tp;	do {		struct reg_window *rw; 		/* Bogus frame pointer? */		if (fp < (thread_base + sizeof(struct thread_info)) ||		    fp >= (thread_base + THREAD_SIZE))			break; 		rw = (struct reg_window *) fp;		if (trace->skip > 0)			trace->skip--;		else			trace->entries[trace->nr_entries++] = rw->ins[7]; 		fp = rw->ins[6] + STACK_BIAS;	} while (trace->nr_entries < trace->max_entries);}