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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-06-02 Jesven the first version
*/
#include <rtthread.h>
#include <backtrace.h>
#define BT_NESTING_MAX 100
static int unwind_frame(struct bt_frame *frame)
{
unsigned long fp = frame->fp;
if ((fp & 0x7)
#ifdef RT_USING_LWP
|| fp < KERNEL_VADDR_START
#endif
)
{
return 1;
}
frame->fp = *(unsigned long *)fp;
frame->pc = *(unsigned long *)(fp + 8);
return 0;
}
static void walk_unwind(unsigned long pc, unsigned long fp)
{
struct bt_frame frame;
unsigned long lr = pc;
int nesting = 0;
frame.fp = fp;
while (nesting < BT_NESTING_MAX)
{
rt_kprintf(" %p", (void *)lr);
if (unwind_frame(&frame))
{
break;
}
lr = frame.pc;
nesting++;
}
}
void backtrace(unsigned long pc, unsigned long lr, unsigned long fp)
{
rt_kprintf("please use: addr2line -e rtthread.elf -a -f %p", (void *)pc);
walk_unwind(lr, fp);
rt_kprintf("\n");
}
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