backtrace.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : backtrace.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, 2008 RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2008-07-29     Bernard      first version from QiuYi implementation
 */

#include <rtthread.h>

#ifdef __GNUC__
/*
-->High Address,Stack Top
PC<-----|
LR	 	 |
IP	 	 |
FP	 	 |
......		 |
PC<-|	 |
LR	 |	 |
IP	 |	 |
FP---|-- |
......	 |
PC	 |
LR	 |
IP 	 |
FP---
-->Low Address,Stack Bottom
*/
void rt_hw_backtrace(rt_uint32_t *fp, rt_uint32_t thread_entry)
{
	rt_uint32_t i, pc, func_entry;

	pc = *fp;
	rt_kprintf("[0x%x]\n", pc-0xC);

	for(i=0; i<10; i++)
	{
		fp = *(fp - 3);
		pc = *fp ;

		func_entry = pc - 0xC;

		if(func_entry <= 0x30000000) break;

		if((func_entry == thread_entry))
		{
			rt_kprintf("EntryPoint:0x%x\n", func_entry);

			break;
		}

		rt_kprintf("[0x%x]\n", func_entry);
	}
}
#else
void rt_hw_backtrace(rt_uint32_t *fp, rt_uint32_t thread_entry)
{
	/* old compiler implementation */
}
#endif