/* * Stack trace management functions * * Copyright (C) 2007 Atmel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */#include <linux/sched.h>#include <linux/stacktrace.h>#include <linux/thread_info.h>#include <linux/module.h> register unsigned long current_frame_pointer asm("r7"); struct stackframe {	unsigned long lr;	unsigned long fp;}; /* * Save stack-backtrace addresses into a stack_trace buffer. */void save_stack_trace(struct stack_trace *trace){	unsigned long low, high;	unsigned long fp;	struct stackframe *frame;	int skip = trace->skip; 	low = (unsigned long)task_stack_page(current);	high = low + THREAD_SIZE;	fp = current_frame_pointer; 	while (fp >= low && fp <= (high - 8)) {		frame = (struct stackframe *)fp; 		if (skip) {			skip--;		} else {			trace->entries[trace->nr_entries++] = frame->lr;			if (trace->nr_entries >= trace->max_entries)				break;		} 		/*		 * The next frame must be at a higher address than the		 * current frame.		 */		low = fp + 8;		fp = frame->fp;	}}EXPORT_SYMBOL_GPL(save_stack_trace);