rt-thread-official/libcpu/arm/common/backtrace.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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 = (rt_uint32_t *)*(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